WO2020224120A1

WO2020224120A1 - High impurity ion content desulfurized gypsum paper-faced gypsum board and manufacturing method therefor

Info

Publication number: WO2020224120A1
Application number: PCT/CN2019/103401
Authority: WO
Inventors: 尹东杰; 武发德; 王鹏起; 谭丹君; 简铭; 王莹; 何亮
Original assignee: 北新集团建材股份有限公司
Priority date: 2019-05-08
Filing date: 2019-08-29
Publication date: 2020-11-12

Abstract

A high impurity ion content desulfurized gypsum paper-faced gypsum board and a manufacturing method therefor. The paper-faced gypsum board comprises a board core and protective paper outside the board core; raw materials of the board core comprise 100 parts by weight of a desulfurized gypsum raw material and 0.5-10 parts by weight of zeolite; the desulfurized gypsum raw material is selected from any one or more of a high-sodium desulfurized gypsum raw material, a high-magnesium desulfurized gypsum raw material, a high-potassium desulfurized gypsum raw material, and a high-chlorine desulfurized gypsum raw material. The zeolite is a modified zeolite; or, an adsorption material is provided on one side of the protective paper in contact with the board core, and the adsorption material is selected from any one or more of zeolite, diatomaceous earth, fly ash, attapulgite clay, and bentonite. The present application takes desulfurized gypsum having high impurity ion content as a raw material of the paper-faced gypsum board, the board core of the manufactured paper-faced gypsum board is not stripped from the protective paper, and the bonding effect is good.

Description

High impurity ion content desulfurized gypsum paper surface gypsum board and preparation method thereof

Technical field

This application relates to but not limited to the technical field of building materials, and particularly relates to but not limited to high impurity ion content desulfurized gypsum gypsum board and its preparation method.

Background technique

Desulfurized gypsum is the product of flue gas desulfurization in coal-fired power plants. With the promotion of flue gas desulfurization projects in coal-fired power plants, the annual output of desulfurized gypsum in China is amazing. Desulfurized gypsum is widely used in building materials and other industries, which promotes the further development of the country's environmental protection and circular economy, and also greatly reduces the amount of natural gypsum mining and protects resources. If the desulfurized gypsum cannot be effectively treated and applied, it will not only waste resources, but also cause secondary pollution to the environment.

At present, the technology of using desulfurized gypsum to prepare plasterboard is relatively mature, but the unstable quality of gypsum will still affect the quality of plasterboard. From the analysis of chemical composition, desulfurized gypsum mainly includes CaO and SO ₃ , as well as water-soluble Na ₂ O, water-soluble K ₂ O, water-soluble MgO, Cl ^- and other impurities. Excessive impurity ions will cause quality problems such as adhesion, expansion, and anti-alkali to gypsum products. In a humid environment, moisture absorption and crystallization of water-soluble impurities will affect the bonding of gypsum board cover paper and board core. Reduce the bonding ability of the protective paper and the board core in a humid environment, affecting the application of gypsum board

The desulfurized gypsum raw materials produced by Chinese power plants are generally of low quality, with large differences in quality and different product performance. Therefore, various paper-faced gypsum board manufacturers strictly control Na ⁺ , K+, Mg ²⁺ , Cl ^-, etc. when desulfurized gypsum enters the plant The use of desulfurized gypsum that exceeds the impurity content is restricted to prevent affecting the performance of the gypsum board, especially the bonding performance.

Summary of the invention

The following is an overview of the topics detailed in this article. This summary is not intended to limit the scope of protection of the claims.

This application provides desulfurized gypsum gypsum board with high impurity ion content and a preparation method thereof. The desulfurized gypsum board with high impurity ion content can be used as the raw material of the gypsum board, and the paper prepared by using desulfurized gypsum with high impurity ion content as the raw material is solved The technical problems of poor dehydration and cohesiveness of gypsum board. The gypsum board prepared by the preparation method of the present application does not peel off the core and the protective paper under harsh test conditions, and has a good bonding effect.

This application provides a high impurity ion content desulfurized gypsum paper-faced gypsum board. The paper-faced gypsum board includes a core and a protective paper on the outside of the core. The raw materials of the core include the following components: raw desulfurization gypsum 100 parts by weight and 0.5 parts by weight to 10 parts by weight of zeolite;

The desulfurized gypsum raw meal is selected from any one or more of high-sodium desulfurized gypsum raw meal, high-magnesium desulfurized gypsum raw meal, high-potassium desulfurized gypsum raw meal, and high-chlorine desulfurized gypsum raw meal;

The content of water-soluble sodium oxide in the high sodium desulfurized gypsum raw meal is x, 0.08wt.%<x≤1.98wt.%;

The content of water-soluble magnesium oxide in the high-magnesium desulfurized gypsum raw meal is y, 0.2wt.%<y≤2.5wt.%;

The content of water-soluble potassium oxide in the high potassium desulfurized gypsum raw meal is z, 0.2wt.%<z≤2.5wt.%;

The chloride ion content in the high-chlorine desulfurized gypsum raw meal is w, 421mg/kg≤w≤8000mg/kg; and,

The zeolite is a modified zeolite; or, the side of the protective paper that is in contact with the plate core has an adsorption material, and the adsorption material is selected from zeolite, diatomaceous earth, fly ash, and attapulgite clay Any one or more of bentonite and bentonite is preferably zeolite.

In this application, "modified zeolite" refers to a zeolite that has been roasted and activated. The internal pores of unmodified zeolite may be occupied by organic matter or other inorganic impurities, the pores cannot be opened completely, and the adsorption and solidification of magnesium ions and chloride ions are not significant.

In this application, the content of water-soluble sodium oxide, the content of water-soluble magnesium oxide, the content of water-soluble potassium oxide and the content of chloride ions all refer to the content of these impurities in the dry-based desulfurized gypsum raw meal. wt.% means weight percentage.

According to the People’s Republic of China Building Materials Industry Standard JC/T 2074-2011 "Flue Gas Desulfurization Gypsum", the technical requirements for desulfurization gypsum above grade 3 are: water-soluble sodium oxide ≤0.08wt.%, water-soluble magnesium oxide ≤0.2wt.% 、Chloride ion content ≤400mg/kg to ensure the performance of gypsum board. There is no regulation on the content of water-soluble potassium oxide. Generally, paper-faced gypsum board manufacturers limit the chloride ion content of the incoming desulfurized gypsum raw materials to ≤300mg/kg to ensure the performance of the paper-faced gypsum board.

The gypsum board of the present application can choose high sodium desulfurized gypsum raw meal with a content of water-soluble sodium oxide of x, 0.08wt.%<x≤1.98wt.%, for example, 0.08wt.%<x≤0.25wt. %, 0.08wt.%<x≤0.23wt.% (equivalent to the content of sodium ions in high-sodium desulfurized gypsum clinker x', 0.07wt.%<x'≤0.20wt.%), 0.25wt. %＜x≤1.98wt.%;

The gypsum board of the present application can choose high-magnesium desulfurized gypsum raw meal with a content of water-soluble magnesium oxide of y, 0.2wt.%<y≤2.5wt.% (equivalent to the magnesium ion in the high-magnesium desulfurized gypsum clinker The content is y', 0.14wt.%＜y'≤1.75wt.%);

For the gypsum board of the present application, a high-potassium desulfurized gypsum raw meal with a water-soluble potassium oxide content of z can be selected, 0.2wt.%<z≤2.5wt.%;

For the gypsum board of the present application, high-chlorine desulfurized gypsum raw material with a chloride ion content of w can be selected, 421mg/kg≤w≤8000mg/kg, for example, 500mg/kg to 1000mg/kg, 450mg/kg to 8000mg/kg or 421mg/kg to 6744mg/kg (equivalent to the chloride ion content in the high-chlorine desulfurized gypsum clinker is y', 421mg/kg<w'≤8000mg/kg).

In the embodiment of the present application, the specific surface area of the modified zeolite may be 500 m ² /g to 1000 m ² /g, and the pore diameter may be 0.40 nm to 0.80 nm.

In the embodiment of the present application, the specific surface area of the zeolite, attapulgite clay, and bentonite in the adsorption material may be 500 m ² /g to 2000 m ² /g, and the pore diameter may be 0.40 nm to 0.60 nm.

In the embodiment of the present application, the specific surface area of the zeolite as the adsorption material may be 500 m ² /g to 2000 m ² /g, for example, 500 m ² /g to 1000 m ² /g, and the pore diameter may be 0.40 nm to 0.60 nm; The specific surface area of the attapulgite clay and bentonite as the adsorbent material may be 500 m ² /g to 2000 m ² /g, and the pore diameter may be 0.40 nm to 0.60 nm.

In the embodiment of the present application, the raw material of the board core may include the following components: 100 parts by weight of desulfurized gypsum raw material, 60 parts by weight to 80 parts by weight of water, 0.5 parts by weight to 10 parts by weight of zeolite, 0.05 parts by weight of glass fiber Parts by weight to 0.2 parts by weight, retarder 0.2 parts by weight to 1 part by weight, starch 0.2 parts by weight to 1 part by weight.

In the embodiment of the present application, the raw material of the board core may include the following components: 100 parts by weight of desulfurized gypsum raw material, 60 parts by weight to 75 parts by weight of water, 0.5 parts by weight to 10 parts by weight of zeolite, 0.05 parts by weight of glass fiber Parts by weight to 0.2 parts by weight, retarder 0.2 parts by weight to 1 part by weight, starch 0.2 parts by weight to 1 part by weight.

In the embodiment of the present application, the zeolite in the plate core is an unmodified zeolite, and the side of the face protection paper contacting the plate core has an adsorbent; the raw material of the plate core may include The following components: 100 parts by weight of desulfurized gypsum raw material, 60 parts by weight to 80 parts by weight of water (for example, 60 parts by weight to 75 parts by weight), 0.5 parts by weight to 10 parts by weight of unmodified zeolite, 0.05 parts by weight of glass fiber Parts by weight to 0.2 parts by weight, retarder 0.2 parts by weight to 1 part by weight, starch 0.2 parts by weight to 1 part by weight.

In the embodiment of the present application, the raw material of the board core may include the following components: 100 parts by weight of desulfurized gypsum raw material, 50.6 parts by weight to 63.2 parts by weight of water, 0.4 parts by weight to 8.4 parts by weight of zeolite, and 0.04 parts by weight of glass fiber Parts by weight to 0.17 parts by weight, retarder from 0.17 parts by weight to 0.84 parts by weight, starch 0.17 parts by weight to 0.84 parts by weight (equivalent to 100 parts by weight of desulfurized gypsum clinker, 60 parts by weight to 75 parts by weight of water, 0.5 parts by weight to zeolite 10 weight parts, glass fiber 0.05 weight part to 0.2 weight part, retarder 0.2 weight part to 1 weight part, starch 0.2 weight part to 1 weight part).

In the embodiment of the present application, the zeolite in the plate core is a modified zeolite, the specific surface area of the modified zeolite is 500m ² /g to 1000m ² /g, and the pore diameter is 0.40nm to 0.80nm The side of the face protection paper that is in contact with the board core may have adsorbent material or no adsorbent material; the raw material of the board core may include the following components: 100 parts by weight of desulfurized gypsum raw material, 50.6 parts by weight of water to 63.2 parts by weight, 0.4 parts by weight to 8.4 parts by weight of modified zeolite, 0.04 parts by weight to 0.17 parts by weight of glass fiber, 0.17 parts by weight to 0.84 parts by weight of retarder, and 0.17 parts by weight to 0.84 parts by weight of starch.

In the embodiments of the present application, the glass fiber may be selected from any one or more of medium-alkali glass fibers, alkali-free glass fibers and alkali-resistant glass fibers.

In the embodiment of the present application, the length of the glass fiber may be 9 mm to 15 mm, and the fiber monofilament diameter may be 10 μm to 15 μm.

In the embodiment of the present application, the retarder can be selected from citric acid, sodium citrate, magnesium citrate, sodium hexametaphosphate, magnesium hexametaphosphate, borax, lignosulfonate, carboxymethyl cellulose Any one or more of sodium, hydroxyethyl cellulose, phosphoric acid and protein retarders.

In the embodiments of the present application, the protein-based gypsum retarder can be selected from any one or more of bone glue protein retarder and protein-based gypsum retarder formed by calcium salting of degraded polyamide.

In the embodiments of the present application, the starch in the board core may be modified starch, and the modified starch may be selected from modified potato starch, modified tapioca starch, modified sorghum starch and modified corn starch. Any one or more. The moisture content in the modified starch may be ≤12wt.%; the pH value may be 5-8; the alkaline fluidity may be 14s-20s.

In the embodiments of the present application, the zeolite in the plate core may be modified natural zeolite, and the raw material of the plate core may include the following components: 100 parts by weight of desulfurized gypsum raw meal, 0.5 parts by weight to 10 parts by weight of modified starch Parts by weight, 50 parts by weight to 70 parts by weight of water, and 1 part by weight to 10 parts by weight of modified natural zeolite.

In the embodiment of the present application, the zeolite in the plate core is a modified natural zeolite that has been calcined at a high temperature, and the side of the face protection paper that is in contact with the plate core may have adsorbent materials or no adsorbent materials; The raw materials of the board core may include the following components: 100 parts by weight of desulfurized gypsum raw material, 0.5 parts by weight to 10 parts by weight of modified starch, 50 parts by weight to 70 parts by weight of water, and 1 part by weight to 10 parts by weight of modified natural zeolite .

In the embodiment of the present application, the modified natural zeolite may be a natural zeolite that has been calcined at a high temperature, the calcining temperature of the high-temperature calcining may be 200° C. to 600° C., and the calcining time may be 1 h to 2 h.

In the embodiments of the present application, the natural zeolite may be selected from any one or more of analcime, mordenite and clinoptilolite.

In the embodiment of the present application, the particle size of the natural zeolite may be 80 mesh to 400 mesh, for example, it may be 200 mesh to 325 mesh.

In the embodiment of the present application, the pore size of the natural zeolite may be 0.4 nm to 0.8 nm.

In the embodiment of the present application, the particle size of the modified starch in the core may be 80 mesh to 150 mesh.

The application also provides a method for preparing high impurity ion content desulfurized gypsum gypsum board, including:

(1) Pretreat the zeolite used to prepare the plate core and activate it: roast the zeolite to remove organic matter, rinse with water after cooling to room temperature, and dry to constant weight after rinsing;

(2) Calcining the de-gypsum raw material to obtain de-gypsum clinker;

(3) The desulfurized gypsum clinker, glass fiber and pretreated zeolite are mechanically stirred and mixed evenly to prepare a mixture;

(4) Weigh water, retarder and starch, mix them evenly to prepare mixed solution 1;

(5) Add the mixture obtained in step (3) to the mixture 1 obtained in step (4) to make a gypsum slurry;

Optionally, (5') pre-coating or spraying the mixed solution 2 of the aqueous solution of starch and the absorbent material on the face protection paper;

(6) The evenly stirred gypsum slurry and the protective paper are lapped and glued to form a wet board;

(7) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board.

(1) Pretreat the zeolite and activate it: roast the zeolite to remove organic matter, rinse with water after cooling to room temperature, and dry to constant weight after rinsing;

(2) Calcining the de-gypsum raw material to obtain de-gypsum clinker;

(3) Mechanically stir and mix the desulfurized gypsum clinker and glass fiber to make a mixture;

(4) Weigh water, retarder, pretreated zeolite and starch, and mix them evenly to prepare mixed solution 1;

In the above preparation method, the zeolite calcining temperature in step (1) can be 200°C to 400°C, the calcining time can be 1.5h to 3h, and the drying temperature can be 45°C to 60°C.

In the preparation method, the step (2) to give a specific surface area of the clinker gypsum may be 3500cm ² / g to 4000cm ² / g.

In the above preparation method, the drying of the wet board may include two or more drying stages with decreasing drying temperature. For example, the drying of the wet board has three drying stages: the drying time of the first drying stage The drying temperature is between 0.1h and 1h, and the drying temperature is 140°C to 200°C; the drying time in the second drying stage is 0.1h to 2h, and the drying temperature is 80°C to 130°C; the drying temperature in the third drying stage is 40°C to 60°C , The drying time is 12-36h or drying to constant weight.

In the embodiment of the present application, the preparation method may include:

(2) Calcining the de-gypsum raw material to obtain de-gypsum clinker;

(7) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board;

In step (1), the zeolite is roasted at a temperature of 200°C to 400°C, the roasting time is 1.5h to 3h, and the drying temperature is 45°C to 60°C;

Step (2) gypsum clinker specific surface area of 3500cm ² / g to 4000cm ² / g;

The drying described in step (7) has three drying stages: the drying time of the first drying stage is 0.5h to 1h, and the drying temperature is 150°C to 200°C; the drying time of the second drying stage is 0.5h to 1.5h , The drying temperature is 100°C to 130°C; the drying time of the third drying stage is 12-36h, and the drying temperature is 5°C to 60°C.

(2) Calcining the de-gypsum raw material to obtain de-gypsum clinker;

The application also provides a method for preparing a desulfurized gypsum gypsum board with high impurity ion content, which includes: coating or spraying a mixed solution containing an adsorbent material on the side of the face protection paper that is in contact with the board core.

(1) Weigh the zeolite used to prepare the plate core and desulfurized gypsum raw meal and mix them uniformly, and crush the material while drying to dehydrate the desulfurized gypsum raw meal to obtain a mixture of desulfurized gypsum clinker and zeolite;

(2) Grind the material obtained in step (1), increase the specific surface area of the material, and then cool the material to further stabilize the phase composition of the material;

(3) Weigh the glass fiber, stir it mechanically with the material obtained in step (2), and mix it evenly;

(4) Weigh water, retarder and starch and mix evenly to make mixed solution 1;

(5) Add the materials prepared in step (3) to the mixed solution 1 and mix uniformly to form a gypsum slurry;

(6) Pre-coating or spraying a mixture of starch aqueous solution and absorbent material on the face protection paper 2;

(7) The well-stirred gypsum slurry and the protective paper are lapped and glued to form a wet board;

(8) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board.

In the above preparation method, after the materials in step (1) are fully mixed and evenly mixed, they enter the hammer-type disperser mill body to disperse the materials while drying, the rotating rotor grinds the materials, and the hot air dries the materials. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

In the preparation method, the step of gypsum (2) in the ground clinker a specific surface area of 3500cm ² / g to 4000cm ² / g, the cooling temperature of the material may be cooled is 25 ℃ to 80 ℃.

In the above preparation method, the weight ratio of water, starch and adsorbent in the mixed solution 2 of the aqueous starch solution and the adsorbent material in step (6) may be 100: (3 to 8): (1 to 5); step (6) The amount of reclaimed water does not exceed 5% of the weight of the desulfurized gypsum raw meal.

(4) Weigh water, retarder and starch and mix evenly to make mixed solution 1;

(8) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board;

Step (1) After the materials are fully mixed and evenly mixed, they enter the hammer-type disperser mill body to disperse the materials while drying, the rotating rotor grinds the materials, the hot air dries the materials, and the hot air directly contacts the green gypsum Heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated into plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ) after being heated;

Step (2) in the ground gypsum clinker specific surface area of 3500cm ² / g to 4000cm ² / g, the cooling temperature of the material is 25 ℃ cooled to 80 deg.] C;

Step (6) The weight ratio of water, starch and adsorbent in the mixed solution 2 of starch aqueous solution and adsorbent material is 100: (3 to 8): (1 to 5); the amount of water in step (6) does not exceed desulfurization 5% of gypsum raw meal weight.

The drying described in step (8) has three drying stages: the drying time of the first drying stage is 0.5h to 1h, and the drying temperature is 140°C to 180°C; the drying time of the second drying stage is 0.5h to 1.5h , The drying temperature is 80°C to 120°C; the drying time of the third drying stage is 12-36h, and the drying temperature is 45°C to 60°C.

(1) Mix water and modified starch uniformly to prepare mixture 1;

(2) The natural zeolite used to prepare the plate core is roasted and modified at high temperature to obtain the modified natural zeolite;

(3) Mixing the desulfurized gypsum raw meal and the modified natural zeolite uniformly, and obtain a mixture of desulfurized gypsum clinker and modified natural zeolite after calcination;

(4) Mixing the mixture 1 obtained in step (1) with the mixture obtained in step (3) uniformly to prepare a gypsum slurry;

Optionally, (4') pre-spray a mixture of starch aqueous solution and absorbent material 2 on the facial protection paper;

(5) The gypsum slurry and the protective paper are lapped and glued to form a wet board;

(6) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board.

In the above preparation method, the calcination temperature of the high-temperature calcination in step (2) may be 200°C to 600°C, and the calcination time may be 1h to 2h; the calcination temperature in step (3) may be 110°C to 270°C. ℃, the calcination time can be 1h to 3h.

In the above preparation method, in step (3), the desulfurized gypsum raw meal and the modified natural zeolite obtained by high-temperature roasting modification are calcined together. On the one hand, the organic matter in the pores of the modified natural zeolite can be further removed, and the pores can be expanded. On the other hand, the modified natural zeolite and desulfurized gypsum are fully mixed during the calcination process, and the resulting mixture is more uniform, and there will be no problem of local mechanical properties of the board due to uneven dispersion.

In the above preparation method, the drying of the wet board may include two or more drying stages with decreasing drying temperature. For example, the drying of the wet board has three drying stages: the drying time of the first drying stage The drying temperature is between 0.1h and 1h, and the drying temperature is 140°C to 200°C; the drying time in the second drying stage is 0.1h to 2h, and the drying temperature is 80°C to 130°C; the drying temperature in the third drying stage is 40°C to 60°C , Drying time is 12-36h or dry to constant weight.

(1) Mix water and modified starch uniformly to prepare mixture 1;

Optionally, (4') pre-spraying the mixed solution 2 of the aqueous solution of starch and the absorbent material on the facial protection paper;

(6) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board;

The calcination temperature of the high-temperature calcination in step (2) is 200°C to 600°C, and the calcination time is 1h to 2h;

The calcination temperature in step (3) is 110° C. to 270° C., and the calcination time can be 1 h to 3 h.

The drying described in step (6) has three drying stages: the drying time of the first drying stage is 0.1h to 1h, and the drying temperature is 140°C to 165°C; the drying time of the second drying stage is 0.1h to 2h, The drying temperature is 80°C to 120°C; the drying temperature of the third drying stage is 40°C to 60°C, and it is dried to constant weight.

In the above preparation method, the uniformly stirred gypsum slurry is thrown into the lower protective paper on the forming table under the action of centrifugal force, and the gypsum slurry is squeezed by the forming knife under the traction force of the solidification belt to make the lower protective surface After the paper is folded at right angles along the roller traces, the lower protective paper and the slurry are lapped with the upper protective paper under the squeeze of the forming plate and adhered firmly to form a wet plate, and then the wet plate is drawn on the solidified belt The bottom is drawn out, and the molding is completed.

In the above-mentioned preparation method, the dried wet board can also be laminated, sawed, edge sealed, and packaged to form a gypsum board.

This application provides a method for improving the bonding effect of gypsum board. Zeolite is a natural porous mineral with well-developed pores, a large number of pores and cavities inside the crystal, a large specific surface area, and high adsorption performance, ion exchange performance, catalysis, acid and heat resistance. Zeolite has a large adsorption capacity for polar molecules or ions. When gypsum with high impurity ion content is used to prepare gypsum board, adding zeolite to the gypsum board core can use zeolite to adsorb impurity ions that migrate to the surface of the board in time to prevent The influence of impurity ions on the bonding performance of gypsum board; at the same time, a large number of pores and pores in the zeolite crystal can fully absorb moisture and free impurity ions after dampness, and improve the moisture absorption and mechanical properties of gypsum board.

During the drying process of the formed wet gypsum board, the impurity ions in the core that are not adsorbed by the zeolite migrate with the starch to the surface of the board. The starch gelatinization plays a binding role, and the impurity ions will destroy the bonding effect. When coating or spraying a mixture of starch and adsorbent on the contact surface of the protective paper and the board core, the impurity ions in the gypsum slurry that are not adsorbed by the zeolite can be absorbed by the adsorbent on the surface of the protective paper into the pores of the adsorbent material , Reduce the influence of impurity ions on adhesion.

At the same time, spraying the mixture of starch and adsorbent on the surface of the face protection paper increases the starch content in the entire gypsum board, which increases the binding effect of starch after gelatinization, which strengthens the binding effect. Under the combined effect, it can reduce the influence of water-soluble Na ₂ O, K ₂ O, MgO moisture absorption and crystallization on the bonding ability of facial paper and board core in humid environment, which affects the application of gypsum board.

Other features and advantages of the present application will be described in the following description, and partly become obvious from the description, or understood by implementing the present application. The purpose and other advantages of this application can be realized and obtained through the structures specifically pointed out in the specification and claims.

Detail

In order to make the purpose, technical solutions, and advantages of the present application clearer, the embodiments of the present application will be described in detail below. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily if there is no conflict.

In the following embodiments, the desulfurized gypsum clinker used is made of solid waste desulfurized gypsum produced by power plant flue gas desulfurization; zeolite is produced by SDIC Shengshi Co., Ltd.; glass fiber is purchased from Beijing Hangzhou Mineral Products Co., Ltd. Modified starch was purchased from Jinan Yuantong Chemical Co., Ltd.; protein-based gypsum retarder made from degraded polyamide by calcium salt, Italy SICIT 2000 gypsum retarder Plast Retard PE, purchased from Shanghai Qinhe Chemical Co., Ltd.; bone glue The protein retarder was purchased from Linyi Heima Gypsum Building Materials Co., Ltd., and the product model is DH-C.

Example 1

In the paper-faced gypsum board prepared in this example, the chloride ion content in the raw material desulfurized gypsum raw meal is 1167 mg/kg, which is equivalent to the chloride ion content in the desulfurized gypsum clinker 1385 mg/kg.

The specific steps for preparing gypsum board are as follows:

Step 1. Pretreat the zeolite and activate it. The method is as follows: the zeolite is roasted in a horse boiling furnace at 300°C for 2 hours to remove organic matter and cooled to room temperature; the zeolite is rinsed with deionized water for 10 times, and the volume of deionized water used is not less than the volume of the zeolite 10 times higher than that, dried under vacuum at 45℃ to constant weight.

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3562 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 1.2 parts by weight of pretreated zeolite, 0.06 parts by weight of medium-alkali glass fiber (glass fiber length is 9mm, fiber monofilament diameter is 10μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3: Weigh 60 parts by weight of water, 0.8 parts by weight of protein-based gypsum retarder formed by calcium salting of degraded polyamide, and 0.3 parts by weight of modified corn starch, and mix them uniformly to prepare a mixed solution.

Step 4: Add the above-prepared mixture to the above-prepared mixture to prepare gypsum slurry.

Step 5: Throw the evenly stirred gypsum slurry into the lower masking paper on the forming table under the action of centrifugal force. The slurry is squeezed by the forming knife under the traction force of the solidification belt, so that the lower masking paper runs along it. After the traces of the roll are folded at right angles, the lower protective paper and the slurry are lapped with the upper protective paper under the squeeze of the forming plate and glued to form a wet plate, and then the wet plate is pulled by the solidification belt It was led out and finished forming.

Step 6. The wet plate is solidified on the conveyor belt, and after being cut, it enters the dryer and goes through three drying stages. The drying time of the first drying stage is 0.6h and the drying temperature is 180°C; the drying time of the second drying stage is 1h and the drying temperature is 110°C; the drying time of the third drying stage is 24h and the drying temperature is 45°C.

Step 7: The dried boards are combined, sawed, sealed, and packaged to form gypsum board.

Example 2

The paper-faced gypsum board prepared in this example has a chloride ion content of 1,571 mg/kg in the raw material desulfurized gypsum clinker, which is equivalent to a chloride ion content of 1864 mg/kg in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3648 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , Pretreated 4.2 parts by weight of zeolite, 0.18 parts by weight of alkali-free glass fiber (glass fiber length is 15mm, fiber monofilament diameter is 15μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3: Weigh 65 parts by weight of water, 0.5 parts by weight of bone glue protein retarder, and 0.5 parts by weight of modified corn starch, and mix uniformly to prepare a mixed solution.

Step four to step eight are the same as in Example 1.

Example 3

The paper-faced gypsum board prepared in this example has a chloride ion content of 4063 mg/kg in the raw material desulfurized gypsum clinker, which is equivalent to a chloride ion content of 4820 mg/kg in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3769 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 6.8 parts by weight of pretreated zeolite, 0.1 parts by weight of alkali-resistant glass fiber (glass fiber length of 12mm, fiber monofilament diameter of 12μm) are mechanically stirred and mixed uniformly to prepare a mixture.

Step 3: Weigh 72 parts by weight of water, 0.26 parts by weight of bone glue protein retarder, and 0.9 parts by weight of modified corn starch, and mix them evenly to prepare a mixed solution.

Step four to step eight are the same as in Example 1.

Example 4

The paper-faced gypsum board prepared in this embodiment has a chloride ion content of 5750 mg/kg in the raw material desulfurized gypsum clinker, which is equivalent to a chloride ion content of 6820 mg/kg in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3864cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.2 parts by weight of medium-alkali glass fiber (glass fiber length is 10mm, fiber filament diameter is 10μm), 9.7 parts by weight of pretreated zeolite, mechanically stirred, and mixed uniformly.

Step 3: Weigh 68 parts by weight of water, 0.26 parts by weight of protein gypsum retarder formed by calcium salting of degraded polyamide, and 0.9 parts by weight of modified corn starch, and mix them evenly.

Step four to step eight are the same as in Example 1.

Example 5

The paper-faced gypsum board prepared in this embodiment has a chloride ion content of 421 mg/kg in the raw material desulfurized gypsum clinker, which is equivalent to a chloride ion content of 499 mg/kg in the desulfurized gypsum clinker.

To prepare the paper-faced gypsum board, the specific raw material ratio and preparation steps 1 to 3 are the same as in Example 1.

Step 4. Spray a layer of starch aqueous solution and a mixture of zeolite on the protective paper of the forming table in advance; the weight ratio of water: modified corn starch: zeolite is 100:3:1, and the amount of water is desulfurized gypsum 3% of raw meal weight.

Step five is the same as step four of embodiment 1.

Step six is the same as step five and four of embodiment 1.

Step seven is the same as step six and four of embodiment 1.

Step eight is the same as step seven or four of embodiment 1.

Comparative example 1

The difference between the gypsum board of Comparative Example 1 and Example 1 is that no zeolite is added in Comparative Example 1, and the remaining components are the same as in Example 1, and the steps for making gypsum board are also the same as in Example 1.

Comparative example 2

The difference between the gypsum board of Comparative Example 2 and Example 2 is that in Comparative Example 2, unmodified zeolite is added, and the remaining components are the same as in Example 2, and the steps for making gypsum board are also the same as in Example 2.

Comparative example 3

The difference between the gypsum board of Comparative Example 3 and Example 3 is that in Comparative Example 3, zeolite is not added, but fly ash of the same weight as that of zeolite is added, and the remaining components are the same as in Example 3. Steps for making gypsum board It is also the same as in Example 3.

Comparative example 4

The difference between the gypsum board of Comparative Example 4 and Example 4 is that in Comparative Example 4, zeolite is not added, but diatomaceous earth with the same weight as that of zeolite is added, and the remaining components are the same as in Example 4. Steps for making gypsum board It is also the same as in Example 4.

Comparative example 5

Commercially available ordinary gypsum board, Beixin Group Building Materials Co., Ltd., 9.5mm thick double-proof board.

Test case 1

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples to test the physical and mechanical properties of the gypsum board. The results are shown in Table 1.

Table 1 Performance test results of gypsum board

It can be seen from Table 1 that the paper-faced gypsum board prepared in the examples of the present application can meet the physical and mechanical properties required by the building materials industry standards in terms of performance. The experimental raw materials, proportions, and preparation steps of Comparative Examples 1, 2, 3, and 4 are similar to those of Examples 1, 2, 3, and 4 respectively, and the performance is similar to that of Examples 1, 2, 3, and 4, indicating that the addition of zeolite is not It will reduce the mechanical properties of gypsum board.

Test case 2

The bonding performance is divided into 5 levels. Level A: The cardboard is firmly bonded and does not separate after being lifted; Level B: A small part is separated, and most of it is intact; Level C: Half is adhered and half is separated; Level D: Most of the separation, only A small part sticks firmly; Grade E: All cardboard is separated.

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples of the paper-faced gypsum board to detect the dry bonding performance of the gypsum board.

The wet-heat bonding performance test method is as follows: the prepared gypsum board is cured by hot steam for 12 minutes in a 100℃ water bath, and the bonding performance of the gypsum board is tested by the method of drawing an equilateral triangle. The test is completed within minutes.

High-humidity environment test: The prepared gypsum board is cured under high-humidity conditions (temperature of (23±2)℃, relative humidity of 90±3), and after reaching the prescribed age for 1 week, adopt equilateral triangle Method to test the bonding performance of gypsum board.

Table 2 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例1Example 1	AA	AA	AA
实施例2Example 2	AA	AA	AA
实施例3Example 3	AA	BB	AA
实施例4Example 4	AA	BB	AA
实施例5Example 5	AA	AA	AA

对比例1Comparative example 1	BB	EE	EE
对比例2Comparative example 2	DD	EE	EE
对比例3Comparative example 3	EE	EE	EE
对比例4Comparative example 4	EE	EE	EE
对比例5Comparative example 5	AA	DD	DD

The performance index testing in this application is based on Chinese national and industry standards. It can be seen from Table 2 that the gypsum boards prepared in Examples 1, 2, 3, 4, and 5 of the present application have better bonding effects than Comparative Examples 1, 2, 3, and 4 under humid, hot, and high-humidity environmental conditions. 5.

Test case 3

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples of the paper-faced gypsum board to detect the moisture deflection of the gypsum board. The Chinese national standard GB/T9775-2008 specifies the test method of gypsum board, but there is no clear standard quantitative value for the qualified range of damp deflection.

Table 3 Moisture deflection test results of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例1Example 1	1.01.0
实施例2Example 2	1.21.2
实施例3Example 3	1.51.5
实施例4Example 4	1.31.3
实施例5Example 5	1.01.0
对比例1Comparative example 1	2.92.9
对比例2Comparative example 2	2.52.5
对比例3Comparative example 3	3.83.8
对比例4Comparative example 4	3.63.6
对比例5Comparative example 5	3.03.0

From the conclusion of Test Example 3, it can be seen that Examples 1, 2, 3, 4, and 5 of the application adopt the paper-faced gypsum board prepared with desulfurized gypsum with high chloride ion content, and the moisture deflection of the paper-faced gypsum board after adding zeolite Compared with Comparative Example 1 and Comparative Example 2 without adding zeolite or adding unmodified zeolite, the moisture deflection value decreased by more than 50%. The deflection values of Comparative Example 1 and Comparative Example 5 are similar. After the addition of unmodified zeolite in Comparative Example 2, the deflection value is reduced by 16.7% compared to Comparative Example 5, indicating that zeolite can reduce the deflection of the gypsum board and improve the effect of modified zeolite. Better. In addition, Comparative Example 3 and Comparative Example 4 show that the mineral admixture fly ash and diatomaceous earth not only cannot improve the deflection, but increase the deflection.

Example 6

The paper-faced gypsum board prepared in this example has a chloride ion content of 1171 mg/kg in the raw material desulfurized gypsum clinker, which is equivalent to a chloride ion content of 1389 mg/kg in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3892cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.06 parts by weight of medium-alkali glass fiber (glass fiber length is 9mm, fiber monofilament diameter is 10μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3. Weigh 60 parts by weight of water, 1.2 parts by weight of pretreated zeolite, 0.8 parts by weight of protein gypsum retarder formed by calcium salting of degraded polyamide, and 0.3 parts by weight of modified corn starch, and mix them evenly. Get the mixture.

Example 7

The paper-faced gypsum board prepared in this embodiment has a chloride ion content of 1318 mg/kg in the raw material desulfurized gypsum clinker, which is equivalent to 1564 mg/kg of chloride ion in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3721 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.18 parts by weight of alkali-free glass fiber (glass fiber length is 15mm, fiber monofilament diameter is 15μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3: Weigh 65 parts by weight of water, 4.2 parts by weight of pretreated zeolite, 0.5 parts by weight of bone glue protein retarder, and 0.5 parts by weight of modified corn starch, and mix them to obtain a mixed solution.

Step four to step eight are the same as in Example 6.

Example 8

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3595 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.1 parts by weight of alkali-resistant glass fiber (glass fiber length is 12mm, fiber monofilament diameter is 12μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3: Weigh 72 parts by weight of water, 6.8 parts by weight of pretreated zeolite, 0.26 parts by weight of bone glue protein retarder, and 0.9 parts by weight of modified corn starch, and mix them evenly to prepare a mixed solution.

Step four to step eight are the same as in Example 6.

Example 9

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3785 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.2 parts by weight of medium-alkali glass fiber (glass fiber length is 10mm, fiber filament diameter is 10μm), mechanically stirred, and mixed uniformly.

Step 3: Weigh 68 parts by weight of water, 9.7 parts by weight of pretreated zeolite, 0.26 parts by weight of protein gypsum retarder formed by calcium salting of degraded polyamide, and 0.9 parts by weight of modified corn starch, and mix them evenly.

Step four to step eight are the same as in Example 6.

Example 10

The paper-faced gypsum board prepared in this embodiment has a chloride ion content of 1171 mg/kg in the raw material desulfurized gypsum clinker, which is equivalent to a chloride ion content of 1389 mg/kg in the desulfurized gypsum clinker.

To prepare the paper-faced gypsum board, the specific raw material ratio and preparation steps 1 to 1 are the same as those in Example 1.

Step 4. Spray a layer of mixed solution of starch solution and zeolite on the masking paper of the forming table in advance; the weight ratio of water: modified corn starch: zeolite is 100:3:1, and the amount of water used is desulfurized gypsum raw meal 3% by weight.

Step five is the same as step four of embodiment 6.

Step six is the same as step five and four of embodiment 6.

Step seven is the same as step six and four of embodiment 6.

Step eight is the same as step seven or four of embodiment 6.

Comparative example 6

The difference between the gypsum board of Comparative Example 6 and Example 6 is that no zeolite is added in Comparative Example 6, and the remaining components are the same as those of Example 6, and the steps for making gypsum board are also the same as those of Example 6.

Comparative example 7

The difference between the gypsum board of Comparative Example 7 and Example 7 is that in Comparative Example 7, unmodified zeolite is added, and the remaining components are the same as those of Example 7, and the steps of making gypsum board are also the same as those of Example 7.

Comparative example 8

The difference between the gypsum board of Comparative Example 8 and Example 8 is that the comparative example 8 does not add zeolite, but adds fly ash of the same weight as that of zeolite, and the remaining components are the same as in Example 8. Steps for making gypsum board It is the same as in Example 8.

Comparative example 9

The difference between the gypsum board of Comparative Example 9 and Example 9 is that the comparative example 9 does not add zeolite, but adds diatomaceous earth of the same weight as that of zeolite, and the remaining components are the same as in Example 9. Steps for making gypsum board It is also the same as in Example 9.

Comparative example 10

Commercially available ordinary gypsum board, Beixin Group Building Materials Co., Ltd., 9.5mm thick fire-resistant board.

Test case 4

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples to test the physical and mechanical properties of the plasterboard. The results are shown in Table 4.

Table 4 Performance test results of gypsum board

It can be seen that the paper-faced gypsum board prepared in the examples of the present application can meet the physical and mechanical properties required by the building materials industry standard in terms of performance. The experimental raw materials, proportions and preparation steps of Comparative Examples 6, 7, 8, and 9 are similar to those of Examples 6, 7, 8, and 9, respectively, and the performance is similar to that of Examples 6, 7, 8, and 9, indicating that the addition of zeolite is not The mechanical properties of gypsum board will decrease.

Test case 5

Table 5 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例6Example 6	AA	AA	AA
实施例7Example 7	AA	BB	AA
实施例8Example 8	AA	BB	AA
实施例9Example 9	AA	AA	AA
实施例10Example 10	AA	AA	AA
对比例6Comparative example 6	BB	EE	EE
对比例7Comparative example 7	CC	EE	EE
对比例8Comparative example 8	DD	EE	EE
对比例9Comparative example 9	EE	EE	EE
对比例10Comparative example 10	AA	EE	DD

The performance index testing in this application is based on national and industry standards. It can be seen from Table 5 that the gypsum board prepared in Example 6 to Example 10 of the present application has better bonding effects than the gypsum board prepared in Comparative Example 6 to Comparative Example 10 under humid, hot and high humidity environmental conditions.

Test case 6

Table 6 Test results of moisture deflection of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例6Example 6	1.21.2
实施例7Example 7	1.51.5
实施例8Example 8	1.61.6
实施例9Example 9	1.31.3
实施例10Example 10	1.11.1
对比例6Comparative example 6	3.23.2
对比例7Comparative example 7	3.03.0
对比例8Comparative example 8	4.64.6
对比例9Comparative example 9	4.14.1
对比例10Comparative example 10	4.24.2

It can be seen from the conclusion of Test Example 3 that the gypsum board prepared by using desulfurized gypsum with high chloride ion content in Examples 6 to 10 of this application, the moisture deflection of the gypsum board after adding zeolite is compared with that of complete In Comparative Example 6 and Comparative Example 7 without adding zeolite or adding unmodified zeolite, the moisture deflection value decreased by more than 50%. After adding unmodified zeolite in Comparative Example 7, the deflection value decreased by 28.5% compared to Comparative Example 10, indicating that zeolite can reduce the deflection of the gypsum board, and the modified zeolite has a better effect. In addition, Comparative Example 8 and Comparative Example 9 show that the addition of fly ash and diatomaceous earth does not improve the moisture deflection of the gypsum board.

Example 11

In the paper-faced gypsum board prepared in this embodiment, the water-soluble magnesium oxide content in the raw material desulfurized gypsum clinker is 0.27 wt.%, which is equivalent to the water-soluble magnesium ion content in the desulfurized gypsum clinker of 0.19 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3652cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 1.05 parts by weight of pretreated zeolite, 0.06 parts by weight of medium-alkali glass fiber (glass fiber length is 9mm, fiber monofilament diameter is 10μm), mechanically agitated and mixed uniformly to prepare a mixture.

Step 3: Weigh 60 parts by weight of water, 0.8 parts by weight of protein-based gypsum retarder formed by calcium salting of degraded polyamide, and 0.3 parts by weight of modified tapioca starch, and mix uniformly to prepare a mixed solution.

Step 6. The wet plate is solidified on the conveyor belt, and after being cut, it enters the dryer and goes through three drying stages. The drying time of the first drying stage is 0.5h and the drying temperature is 180°C; the drying time of the second drying stage is 1h and the drying temperature is 110°C; the drying time of the third drying stage is 32h and the drying temperature is 45°C.

Example 12

The gypsum board prepared in this embodiment has a water-soluble magnesium oxide content of 1.20 wt.% in the raw material desulfurized gypsum clinker, which is equivalent to a water-soluble magnesium ion content of 0.86 wt.% in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 1. Pretreat the zeolite and activate it. The method is as follows: the zeolite is roasted in a horse boiling furnace at 300°C for 2 hours, the organic matter is removed, and cooled to room temperature; the zeolite is rinsed with deionized water 10 times, and the volume of deionized water used is not less than the volume of the zeolite 10 times higher than that, dried under vacuum at 45℃ to constant weight.

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3834 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , Pretreated 4.10 parts by weight of zeolite, 0.18 parts by weight of alkali-free glass fiber (glass fiber length is 15mm, fiber monofilament diameter is 15μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3: Weigh 65 parts by weight of water, 0.5 parts by weight of bone glue protein retarder, and 0.5 parts by weight of modified tapioca starch, and mix them to obtain a mixed solution.

Steps four to eight are the same as in embodiment 11.

Example 13

In the paper-faced gypsum board prepared in this example, the content of water-soluble magnesium oxide in the raw material desulfurized gypsum raw meal is 2.18 wt.%, which is equivalent to the content of water-soluble magnesium ion in the desulfurized gypsum clinker 1.56 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3934cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 6.7 parts by weight of pretreated zeolite, 0.1 parts by weight of alkali-resistant glass fiber (glass fiber length is 12mm, fiber monofilament diameter is 12μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3: Weigh 72 parts by weight of water, 0.26 parts by weight of bone glue protein retarder, and 0.9 parts by weight of modified tapioca starch, and mix them evenly to prepare a mixed solution.

Steps four to eight are the same as in embodiment 11.

Comparative example 11

The difference between the gypsum board of Comparative Example 11 and Example 11 is that no zeolite is added in Comparative Example 11, and the remaining components are the same as those of Example 11. The steps for making gypsum board are also the same as those of Example 11.

Comparative example 12

The difference between the gypsum board of Comparative Example 12 and Example 12 is that unmodified zeolite is added in Comparative Example 12, and the remaining components are the same as those of Example 12. The steps for making gypsum board are also the same as those of Example 12.

Comparative example 13

The difference between the gypsum board of Comparative Example 13 and Example 13 is that the comparative example 13 does not add zeolite, but adds fly ash of the same weight as that of zeolite, and the remaining components are the same as in Example 13. Steps for making gypsum board It is the same as in Example 13.

Comparative example 14

The difference between the gypsum board of Comparative Example 14 and Example 13 is that the comparative example 14 does not add zeolite, but adds diatomaceous earth of the same weight as that of zeolite, and the remaining components are the same as in Example 13. Steps for making gypsum board It is the same as in Example 13.

Comparative example 15

Commercially available ordinary gypsum board, Beixin Group Building Materials Co., Ltd., 9.5mm thick home improvement board.

Test case 7

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples of the paper-faced gypsum board to detect the physical and mechanical properties of the gypsum board. The results are shown in Table 7.

Table 7 Performance test results of gypsum board

It can be seen from Table 7 that the paper-faced gypsum board prepared in the examples of the present application can meet the physical and mechanical properties required by the building materials industry standards in terms of performance. The experimental raw materials, proportions and preparation steps of Comparative Examples 11, 12, 13, and 14 are similar to those of Examples 11, 12, and 13, respectively. The performance is similar to that of Examples 11, 12, and 13, indicating that the addition of zeolite will not make paper The mechanical properties of gypsum board decrease.

Test case 8

Table 8 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例11Example 11	AA	AA	AA
实施例12Example 12	AA	AA	AA
实施例13Example 13	AA	BB	AA
对比例11Comparative example 11	AA	EE	EE
对比例12Comparative example 12	CC	EE	EE
对比例13Comparative example 13	DD	EE	EE
对比例14Comparative example 14	CC	EE	EE
对比例15Comparative example 15	AA	DD	DD

The performance index testing in this application is based on Chinese national and industry standards. It can be seen from Table 8 that the gypsum boards prepared in Examples 11, 12, and 13 of the present application have better bonding effects than Comparative Examples 11, 12, 13, 14, and 15 under humid, hot, and high-humidity environmental conditions.

Test case 9

Table 9 Test results of moisture deflection of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例11Example 11	1.21.2
实施例12Example 12	1.41.4
实施例13Example 13	1.51.5
对比例11Comparative example 11	6.86.8

对比例12Comparative example 12	4.94.9
对比例13Comparative example 13	7.57.5
对比例14Comparative example 14	6.56.5
对比例15Comparative example 15	3.53.5

It can be seen from the conclusion of Test Example 9 that in Examples 11, 12, and 13 of the present application, high-magnesium ion desulfurized gypsum is used to prepare gypsum board, and the board with modified zeolite has a significantly lower moisture deflection than Comparative Example 11. Comparative Example 12 shows that adding zeolite helps reduce the flexibility of gypsum board, and adding modified zeolite has a better effect. Compared with Comparative Example 13 and Comparative Example 14, the deflection reduction effect of zeolite on the plate is more prominent than that of fly ash and diatomite. Compared with the commercially available ordinary gypsum board, the gypsum board prepared by the technical measures of the present application has a significant improvement effect in terms of damp deflection.

Example 14

In the paper-faced gypsum board prepared in this embodiment, the content of water-soluble magnesium oxide in the raw material desulfurized gypsum clinker is 0.25 wt.%, which is equivalent to the magnesium ion content of 0.18 wt.% in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3596 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.06 parts by weight of medium-alkali glass fiber (glass fiber length is 9mm, fiber monofilament diameter is 10μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3. Weigh 60 parts by weight of water, 1.25 parts by weight of pretreated zeolite, 0.8 parts by weight of protein gypsum retarder formed by calcium salting of degraded polyamide, and 0.3 parts by weight of modified corn starch, and mix them evenly. Get the mixture.

Example 15

In the paper-faced gypsum board prepared in this embodiment, the water-soluble magnesium oxide content in the raw material desulfurized gypsum clinker is 1.05 wt.%, which is equivalent to the water-soluble magnesium ion content in the desulfurized gypsum clinker 0.75 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3985 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.18 parts by weight of alkali-free glass fiber (glass fiber length is 15mm, fiber monofilament diameter is 15μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step four to step eight are the same as the embodiment 14.

Example 16

In the paper-faced gypsum board prepared in this embodiment, the content of water-soluble magnesium oxide in the raw material desulfurized gypsum clinker is 2.32 wt.%, which is equivalent to the content of water-soluble magnesium ion in the desulfurized gypsum clinker 1.66 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3742 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.1 parts by weight of alkali-resistant glass fiber (glass fiber length is 12mm, fiber monofilament diameter is 12μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step four to step eight are the same as the embodiment 14.

Comparative example 16

The difference between the gypsum board of Comparative Example 16 and Example 14 is that no zeolite is added in Comparative Example 16, and the remaining components are the same as those of Example 14. The steps for making gypsum board are also the same as those of Example 14.

Comparative example 17

The difference between the gypsum board of Comparative Example 17 and Example 15 is that the unmodified zeolite is added in Comparative Example 17, and the remaining components are the same as those of Example 15, and the steps for making gypsum board are also the same as those of Example 15.

Comparative example 18

The difference between the gypsum board of Comparative Example 18 and Example 16 is that the comparative example 18 does not add zeolite, but adds fly ash of the same weight as that of zeolite, and the remaining components are the same as in Example 16. Steps for making gypsum board It is also the same as in Example 16.

Comparative example 19

The difference between the gypsum board of Comparative Example 19 and Example 16 is that in Comparative Example 19, zeolite is not added, but diatomaceous earth with the same weight as that of zeolite is added, and the remaining components are the same as in Example 16. Steps for making gypsum board It is also the same as in Example 16.

Comparative example 20

Test case 10

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples to test the physical and mechanical properties of the paper-faced gypsum board. The results are shown in Table 10.

Table 10 Performance Test Results of Gypsum Board

It can be seen from Table 10 that the paper-faced gypsum boards prepared in Examples 14, 15, and 16 of the present application can meet the physical and mechanical properties required by the building materials industry standards in terms of performance. The experimental raw materials, proportions and preparation steps of Comparative Examples 16, 17, 18, and 19 are similar to those of Examples 14, 15, and 16, respectively, and the performance is similar to that of Examples 14, 15, and 16, indicating that the addition of zeolite will not make paper The mechanical properties of gypsum board decrease.

Test case 11

Table 11 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例14Example 14	AA	AA	AA
实施例15Example 15	AA	BB	AA
实施例16Example 16	AA	BB	AA
对比例16Comparative example 16	AA	EE	EE
对比例17Comparative example 17	CC	EE	EE
对比例18Comparative example 18	DD	EE	EE
对比例19Comparative example 19	DD	EE	EE
对比例20Comparative example 20	AA	EE	DD

The performance index testing in this application is based on Chinese national and industry standards. It can be seen from Table 11 that the paper-faced gypsum boards prepared in Examples 14, 15, and 16 of the present application have better bonding effects than the paper prepared in Comparative Examples 16, 17, 18, 19, and 20 under humid, hot, and high-humidity environmental conditions. Gypsum board.

Test case 12

Table 12 Test results of moisture deflection of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例14Example 14	1.51.5
实施例15Example 15	1.71.7
实施例16Example 16	1.61.6
对比例16Comparative example 16	6.46.4
对比例17Comparative example 17	4.54.5
对比例18Comparative example 18	6.46.4
对比例19Comparative example 19	7.37.3
对比例20Comparative example 20	3.53.5

From the data of Test Example 12, it can be seen that Examples 14, 15, and 16 of the present application used high-magnesium ion desulfurized gypsum to prepare gypsum boards, and the boards with modified zeolite had significantly lower moisture deflection than Comparative Example 16. The ratio of 17, indicates that adding zeolite helps reduce the flexibility of gypsum board, and adding modified zeolite has better effect. Compared with Comparative Example 18 and Comparative Example 19, the effect of zeolite on the deflection of the board is more prominent than that of fly ash and diatomaceous earth. Compared with the commercially available ordinary gypsum board, the gypsum board prepared by the technical measures of the present application has a significant improvement effect in terms of damp deflection.

Example 17

In the paper-faced gypsum board prepared in this embodiment, the water-soluble sodium oxide content in the raw material desulfurized gypsum raw meal is 0.14 wt.%, which is equivalent to the water-soluble sodium ion content in the desulfurized gypsum clinker of 0.12 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3646 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 1.05 parts by weight of pretreated zeolite, 0.06 parts by weight of medium-alkali glass fiber (glass fiber length is 9mm, fiber monofilament diameter is 10μm), mechanically agitated and mixed uniformly to prepare a mixture.

Step 3: Weigh 60 parts by weight of water, 0.8 parts by weight of protein-based gypsum retarder formed by calcium salting of degraded polyamide, and 0.3 parts by weight of modified potato starch, and mix uniformly to prepare a mixed solution.

Example 18

In the paper-faced gypsum board prepared in this embodiment, the content of water-soluble sodium oxide in the raw material desulfurized gypsum raw meal is 0.17 wt.%, which is equivalent to the content of water-soluble sodium ion in the desulfurized gypsum clinker 0.15 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3839 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , Pretreated 4.10 parts by weight of zeolite, 0.18 parts by weight of alkali-free glass fiber (glass fiber length is 15mm, fiber monofilament diameter is 15μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3: Weigh 65 parts by weight of water, 0.5 parts by weight of bone glue protein retarder, and 0.5 parts by weight of modified potato starch, and mix them uniformly to prepare a mixed solution.

Steps four to eight are the same as in embodiment 17.

Example 19

The gypsum board prepared in this example has a water-soluble sodium oxide content of 0.23 wt.% in the raw material desulfurized gypsum clinker, which is equivalent to 0.20 wt.% of water-soluble sodium ion in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3546 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 6.7 parts by weight of pretreated zeolite, 0.1 parts by weight of alkali-resistant glass fiber (glass fiber length is 12mm, fiber monofilament diameter is 12μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3: Weigh 72 parts by weight of water, 0.26 parts by weight of bone glue protein retarder, and 0.9 parts by weight of modified potato starch, and mix them evenly to prepare a mixed solution.

Steps four to eight are the same as in embodiment 17.

Comparative example 21

The difference between the gypsum board of Comparative Example 21 and Example 17 is that the zeolite is not added in Comparative Example 21, and the remaining components are the same as those of Example 17, and the steps for making gypsum board are also the same as those of Example 17.

Comparative example 22

The difference between the gypsum board of Comparative Example 22 and Example 18 is that the unmodified zeolite is added in Comparative Example 22, and the remaining components are the same as those of Example 18. The steps for making gypsum board are also the same as those of Example 18.

Comparative example 23

The difference between the gypsum board of Comparative Example 23 and Example 19 is that the comparison example 23 does not add zeolite, but adds the same weight of pozzolan as the zeolite, and the remaining components are the same as in Example 19. Example 19 is the same.

Comparative example 24

The difference between the gypsum board of Comparative Example 24 and Example 19 is that in Comparative Example 24, zeolite is not added, but diatomaceous earth with the same weight as that of zeolite is added, and the remaining components are the same as in Example 19. Steps for making gypsum board It is also the same as in Example 19.

Comparative example 25

Test case 13

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples of the paper-faced gypsum board to detect the physical and mechanical properties of the gypsum board. The results are shown in Table 13.

Table 13 Performance test results of gypsum board

It can be seen from Table 13 that the paper-faced gypsum board prepared in the examples of this application can meet the physical and mechanical properties required by the building materials industry standard in terms of performance. The experimental raw materials, proportions and preparation steps of Comparative Examples 21, 22, 23, and 24 are similar to those of Examples 17, 18, and 19 respectively, and the performance is similar to that of Examples 17, 18, 19, indicating that the addition of zeolite will not make paper The mechanical properties of gypsum board decrease.

Test case 14

Table 14 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例17Example 17	AA	AA	AA
实施例18Example 18	AA	AA	AA
实施例19Example 19	AA	BB	AA

对比例21Comparative example 21	BB	EE	EE
对比例22Comparative example 22	DD	EE	EE
对比例23Comparative example 23	EE	EE	EE
对比例24Comparative example 24	EE	EE	EE
对比例25Comparative example 25	AA	DD	DD

The performance index testing in this application is based on Chinese national and industry standards. It can be seen from Table 14 that the gypsum boards prepared in Examples 17, 18, and 19 of the present application have better bonding effects than Comparative Examples 21, 22, 23, 24, and 25 under humid, hot, and high-humidity environmental conditions.

Test case 15

Table 15 Test results of moisture deflection of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例17Example 17	1.11.1
实施例18Example 18	0.90.9
实施例19Example 19	1.21.2
对比例21Comparative example 21	3.33.3
对比例22Comparative example 22	2.12.1
对比例23Comparative example 23	4.54.5
对比例24Comparative example 24	3.03.0
对比例25Comparative example 25	2.82.8

It can be seen from the conclusion of Test Example 15 that in Examples 17, 18, and 19 of the present application, high-sodium ion desulfurized gypsum was used to prepare gypsum board, and the board with modified zeolite had significantly lower moisture deflection than Comparative Example 21. Comparative Example 22 shows that adding zeolite helps reduce the flexibility of gypsum board, and adding modified zeolite has a better effect. Compared with Comparative Example 23 and Comparative Example 24, the effect of zeolite on the deflection of the plate is more prominent than that of pozzolan and diatomite. The paper-faced gypsum board prepared by the technical measures of the present application has a significant improvement effect in terms of moisture deflection compared with the commercially available ordinary paper-faced gypsum board.

Example 20

In the paper-faced gypsum board prepared in this embodiment, the water-soluble sodium oxide content in the raw material desulfurized gypsum clinker is 0.10 wt.%, which is equivalent to the water-soluble sodium ion content of 0.09 wt.% in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3652cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.06 parts by weight of medium-alkali glass fiber (glass fiber length is 9mm, fiber monofilament diameter is 10μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step 3. Weigh 60 parts by weight of water, 1.25 parts by weight of pretreated zeolite, 0.8 parts by weight of protein gypsum retarder formed by calcium salting of degraded polyamide, and 0.3 parts by weight of modified corn starch. Get the mixture.

Example 21

The gypsum board prepared in this embodiment has a water-soluble sodium oxide content of 0.14 wt.% in the raw material desulfurized gypsum clinker, which is equivalent to a water-soluble sodium ion content of 0.12 wt.% in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of raw desulfurized gypsum and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3756 cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.18 parts by weight of alkali-free glass fiber (glass fiber length is 15mm, fiber monofilament diameter is 15μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step four to step eight are the same as the embodiment 20.

Example 22

In the paper-faced gypsum board prepared in this embodiment, the water-soluble sodium oxide content in the raw material desulfurized gypsum clinker is 0.18 wt.%, which is equivalent to the water-soluble sodium ion content of 0.16 wt.% in the desulfurized gypsum clinker.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum raw material and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3634cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.1 parts by weight of alkali-resistant glass fiber (glass fiber length is 12mm, fiber monofilament diameter is 12μm), mechanically stirred and mixed uniformly to prepare a mixture.

Step four to step eight are the same as the embodiment 20.

Example 23

In the paper-faced gypsum board prepared in this example, the content of water-soluble sodium oxide in the raw material desulfurized gypsum clinker is 0.22 wt.%, which is equivalent to the content of water-soluble sodium ion in the desulfurized gypsum clinker 0.19 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 2. Weigh 118.6 parts by weight of desulfurized gypsum clinker and calcinate at 170°C for 1 hour to obtain 100 parts by weight of desulfurized gypsum clinker. The specific surface area of desulfurized gypsum clinker is 3569cm ² /g; weigh 100 parts by weight of desulfurized gypsum clinker , 0.2 parts by weight of medium-alkali glass fiber (glass fiber length is 10mm, fiber filament diameter is 10μm), mechanically stirred, and mixed uniformly.

Step 3: Weigh 68 parts by weight of water, 9.8 parts by weight of pretreated zeolite, 0.26 parts by weight of protein gypsum retarder formed by calcium salting of degraded polyamide, and 0.9 parts by weight of modified corn starch, and mix them evenly.

Step four to step eight are the same as the embodiment 20.

Comparative example 26

The difference between the gypsum board of Comparative Example 26 and Example 20 is that no zeolite is added in Comparative Example 26, and the remaining components are the same as those of Example 20, and the steps for making gypsum board are also the same as those of Example 20.

Comparative example 27

The difference between the gypsum board of Comparative Example 27 and Example 21 is that unmodified zeolite is added in Comparative Example 27, and the remaining components are the same as those of Example 21, and the steps for making gypsum board are also the same as those of Example 21.

Comparative example 28

The difference between the gypsum board of Comparative Example 28 and Example 22 is that Comparative Example 28 does not add zeolite, but adds the same weight of pozzolan as the zeolite, and the remaining components are the same as in Example 22. Embodiment 22 is the same.

Comparative example 29

The difference between the gypsum board of Comparative Example 29 and Example 23 is that in Comparative Example 29, zeolite is not added, but diatomaceous earth with the same weight as that of zeolite is added, and the remaining components are the same as in Example 23. Steps for making gypsum board It is also the same as in Example 23.

Comparative example 30

Test case 16

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples to test the physical and mechanical properties of the plasterboard. The results are shown in Table 16.

Table 16 Performance test results of gypsum board

It can be seen from Table 16 that the paper-faced gypsum board prepared in the examples of this application can meet the physical and mechanical properties required by the building materials industry standards in terms of performance. The experimental raw materials, proportions and preparation steps of Comparative Examples 26, 27, 28, and 29 are similar to those of Examples 20, 21, 22, and 23 respectively, and the performance is similar to that of Examples 20, 21, 22, and 23, indicating that the addition of zeolite is not The mechanical properties of gypsum board will decrease.

Test case 17

Table 17 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例20Example 20	AA	AA	AA
实施例21Example 21	AA	BB	AA
实施例22Example 22	AA	BB	AA

实施例23Example 23	AA	AA	AA
对比例26Comparative example 26	BB	EE	EE
对比例27Comparative example 27	DD	EE	EE
对比例28Comparative example 28	CC	EE	EE
对比例29Comparative example 29	DD	EE	EE
对比例30Comparative example 30	AA	EE	DD

The performance index testing in this application is based on national and industry standards. As can be seen from Table 17, this application

The gypsum boards prepared in Examples 20, 21, 22, and 23 have better bonding effects than Comparative Examples 26, 27, 28, 29, and 30 under humid, hot, and high-humidity environmental conditions.

Test case 18

Table 18 Test results of damp deflection of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例20Example 20	0.90.9
实施例21Example 21	1.41.4
实施例22Example 22	1.21.2
实施例23Example 23	1.31.3
对比例26Comparative example 26	3.23.2
对比例27Comparative example 27	2.12.1
对比例28Comparative example 28	4.34.3
对比例29Comparative example 29	3.23.2
对比例30Comparative example 30	2.92.9

It can be seen from the conclusion of Test Example 18 that the gypsum board prepared by the technical measures of the application (Examples 20, 21, 22 and 23) can significantly reduce the deflection of the gypsum board compared with Comparative Examples 26 to 30 , Which shows that zeolite also has the effect of reducing the moisture deflection of the board. When high-sodium desulfurized gypsum is used to prepare gypsum board, adding zeolite to the core can significantly reduce the moisture deflection of the board. When the zeolite is roasted zeolite, The effect of improving the damp deflection of the sheet is better. By comparing Example 20 to Example 23 and Comparative Example 28, it can be seen that in Comparative Example 29, the effect of zeolite on the deflection of the plate is more prominent than that of pozzolan and diatomaceous earth.

Example 24

The paper-faced gypsum board prepared in this example has a chloride ion content of 1126 mg/kg in the raw material desulfurized gypsum plaster.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 1.2 parts by weight of zeolite. The zeolite and the desulfurized gypsum raw material are fully mixed evenly and enter the grinding body of the hammer-type disperser to disperse the material while drying. The rotating rotor will The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

Step 2: The material enters the ball mill for ball milling until the specific surface area of the desulfurized gypsum clinker is 3800 cm ² /g.

Step 3: Cool the material to 35°C to further stabilize the phase composition.

Step 4. Weigh 0.06 parts by weight of medium-alkali glass fiber (glass fiber length is 9mm, fiber monofilament diameter is 10μm), and mechanically stir it with the cooled material and mix uniformly to prepare a mixture.

Step 5: Weigh 68 parts by weight of water, 0.25 parts by weight of protein-based gypsum retarder formed by calcium salting of degraded polyamide, and 0.2 parts by weight of modified corn starch, and mix them to form a mixed solution.

Step 6: Add the mixture to the mixture prepared in Step 5 to make gypsum slurry.

Step 7: Spray a layer of mixed solution of starch solution and zeolite on the masking paper of the forming table in advance. The weight ratio of water: modified corn starch: zeolite is 100:3:1. The amount of water used is 3% of the weight of the desulfurized gypsum raw meal.

Step 8. The evenly stirred slurry is thrown onto the lower masking paper on the forming table under the action of centrifugal force. The slurry is squeezed by the forming knife under the traction force of the solidification belt to make the lower masking paper roll along its roll After the traces are folded at a right angle, the lower protective paper and the slurry are lapped with the upper protective paper under the squeeze of the forming plate, and glued to form a wet plate, and then the wet plate is pulled by the solidified belt Lead out and complete the molding.

Step 9: The wet plate is solidified on the conveyor belt. After being cut off, it enters the dryer and passes through three drying stages: the drying time of the first drying stage is 0.5h and the drying temperature is 180℃; the drying time of the second drying stage is 0.6 h, the drying temperature is 120°C; the drying time of the third drying stage is 12h, and the drying temperature is 60°C.

Step 10: The dried boards are combined, sawed, sealed and packaged to form gypsum board.

Example 25

The paper-faced gypsum board prepared in this example has a chloride ion content of 2615 mg/kg in the raw desulfurized gypsum raw material.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 3.8 parts by weight of zeolite. The zeolite and the desulfurized gypsum raw material are fully mixed evenly and enter the grinding body of the hammer-type disperser to disperse the material while drying. The rotating rotor will The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

Step 2: The material enters the ball mill for ball milling until the specific surface area of the desulfurized gypsum clinker is 3500 cm ² /g.

Step 3: Cool the material to 55°C to further stabilize the phase composition.

Step 4. Weigh 0.09 parts by weight of alkali-free glass fiber (glass fiber length is 15mm, fiber monofilament diameter is 15μm), and mechanically stir it with the cooled material and mix evenly to prepare a mixture.

Step 5: Weigh 70 parts by weight of water, 0.5 parts by weight of bone gel protein retarder, and 0.55 parts by weight of modified corn starch, and mix them to form a mixed solution.

Step 7: Spray a layer of mixed solution of starch solution and zeolite on the protective paper of the forming table in advance. The weight ratio of water: modified corn starch: zeolite is 100:5:3. The amount of water used is 3% of the weight of the desulfurized gypsum raw meal.

Step 9. The wet plate is solidified on the conveyor belt. After being cut off, it enters the dryer and passes through three drying stages: the drying time of the first drying stage is 1h, and the drying temperature is 140℃; the drying time of the second drying stage is 1.5h , The drying temperature is 80℃; the drying time of the third drying stage is 36h, and the drying temperature is 45℃.

Example 26

The paper-faced gypsum board prepared in this example has a chloride ion content of 6251 mg/kg in the raw material desulfurized gypsum plaster.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 6.8 parts by weight of zeolite. The zeolite and the desulfurized gypsum raw material are mixed evenly and enter the grinding body of the hammer-type disperser to disperse the materials while drying. The rotating rotor will The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

Step 2: The material enters the ball mill for ball milling until the specific surface area of the desulfurized gypsum clinker is 4000 cm ² /g.

Step 3: Cool the material to 75°C to further stabilize the phase composition.

Step 4. Weigh 0.16 parts by weight of alkali-resistant glass fiber (glass fiber length is 12mm, fiber monofilament diameter is 12μm), mechanically stir it with the cooled material, and mix evenly to prepare a mixture.

Step 5: Weigh 72 parts by weight of water, 0.6 parts by weight of protein-based gypsum retarder formed by calcium salting of degraded polyamide, and 0.75 parts by weight of modified corn starch, and mix them to form a mixed solution.

Step 7: Spray a layer of mixed solution of starch solution and zeolite on the protective paper of the forming table in advance. The weight ratio of water: modified corn starch: zeolite is 100:6:4. The amount of water used is 3% of the weight of the desulfurized gypsum raw meal.

Step 9. The wet plate is solidified on the conveyor belt. After being cut off, it enters the dryer and passes through three drying stages: the drying time of the first drying stage is 0.8h, and the drying temperature is 155℃; the drying time of the second drying stage is 1h , The drying temperature is 110℃; the drying time of the third drying stage is 24h, and the drying temperature is 45℃.

Example 27

The paper-faced gypsum board prepared in this example has a chloride ion content of 6534 mg/kg in the raw material desulfurized gypsum plaster.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 9.7 parts by weight of zeolite. The zeolite and the desulfurized gypsum raw material are fully mixed evenly and enter the grinding body of the hammer disperser. The material is dispersed while drying, and the rotating rotor will The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

Step 2: The material enters the ball mill to be milled until the specific surface area of the desulfurized gypsum clinker is 3780 cm ² /g

Step 3: Cool the material to 45°C to further stabilize the phase composition.

Step 4: Weigh 0.18 parts by weight of alkali-resistant glass fiber (glass fiber length is 12mm, fiber monofilament diameter is 12μm), mechanically stir it with the cooled material, and mix uniformly to prepare a mixture.

Step 5. Weigh 73 parts by weight of water, 0.6 parts by weight of protein-based gypsum retarder formed by calcium salting of degraded polyamide, and 0.75 parts by weight of modified corn starch, and mix them to form a mixed solution.

Step 7: Spray a layer of mixed solution of starch solution and zeolite on the protective paper of the forming table in advance. The weight ratio of water: modified corn starch: zeolite is 100:8:5. The water consumption of the mixed solution is 4% of the weight of the desulfurized gypsum raw meal.

Step 9: The wet plate is solidified on the conveyor belt. After being cut off, it enters the dryer and passes through three drying stages: the drying time of the first drying stage is 0.8h and the drying temperature is 155℃; the drying time of the second drying stage is 1.3 h, the drying temperature is 115°C; the drying time of the third drying stage is 18h, and the drying temperature is 50°C.

Comparative example 31

The desulfurized gypsum of Example 24 was used to prepare gypsum board without adding zeolite in step one; in step seven, only water was sprayed, and the mixture of starch and zeolite was not sprayed. The rest of the components are the same as in Example 24, and the other steps of making gypsum board are also the same as in Example 24.

Comparative example 31-1

The desulfurized gypsum of Example 24 was used to prepare gypsum board, and zeolite was added in step one; in step seven, only water was sprayed, and the mixture of starch and zeolite was not sprayed. The rest of the components are the same as in Example 24, and the other steps of making plasterboard are also the same as in Example 24.

Comparative example 32

The desulfurized gypsum board of Example 24 was used to prepare gypsum board. No zeolite was added in step one; the seventh step was to spray a mixed solution of water and starch. The remaining components were the same as in Example 24. The other steps for making gypsum board were also Embodiment 24 is the same.

Comparative example 32-1

The desulfurized gypsum of Example 25 was used to prepare paper-faced gypsum board. In step one, zeolite was added; in step seven, only zeolite powder was evenly sprayed on the surface of the protective paper. The remaining components are the same as in Example 25, and the other steps of making gypsum board are also the same as in Example 25.

Comparative example 33

The desulfurized gypsum of Example 26 was used to prepare gypsum board. In step 1, zeolite was not added, and fly ash of the same weight as zeolite was added. The remaining components are the same as in Example 26, and the other steps of making gypsum board are also the same as in Example 26.

Comparative example 33-1

The desulfurized gypsum raw material of Example 26 was used to prepare gypsum board. In step 1, zeolite was not added, and the same weight of diatomaceous earth as zeolite was added. The remaining components are the same as in Example 26, and the other steps of making gypsum board are also the same as in Example 26.

Comparative example 34

Commercially available ordinary gypsum board, Pingyi Huachen Gypsum Building Materials Co., Ltd., 9.5mm thick ordinary gypsum board.

Test case 19

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples of the paper-faced gypsum board to detect the physical and mechanical properties of the gypsum board. The results are shown in Table 19.

Table 19 Performance Test Results of Gypsum Board

It can be seen from Table 19 that the paper-faced gypsum board prepared in the examples of this application can meet the physical and mechanical properties required by the building materials industry standard in terms of performance. The performance of the comparative example is similar to that of the examples, indicating that the addition of zeolite and the spraying of the mixture of starch and zeolite on the protective paper will not affect the mechanical properties of the gypsum board.

Test case 20

Table 20 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例24Example 24	AA	AA	AA
实施例25Example 25	AA	AA	AA
实施例26Example 26	AA	AA	AA
实施例27Example 27	AA	AA	AA
对比例31Comparative example 31	BB	EE	EE
对比例31-1Comparative example 31-1	AA	BB	AA
对比例32Comparative example 32	DD	EE	EE
对比例32-1Comparative example 32-1	AA	BB	BB
对比例33Comparative example 33	EE	EE	EE
对比例33-1Comparative example 33-1	AA	BB	EE
对比例34Comparative example 34	EE	EE	EE

The performance index testing in this application is based on Chinese national and industry standards. It can be seen from Table 20 that the gypsum boards prepared in Examples 24, 25, 26 and 27 of the present application have better bonding effects than the comparative examples under humid, hot, and high-humidity environmental conditions. Compared with the comparative examples, the two technical methods of adding zeolite inside the gypsum board core and spraying a layer of starch and zeolite mixture on the face protection paper have complementary effects, and have a complementary effect on the adhesion of the face protection paper and the board core. The knot performance is enhanced.

Test case 21

Table 21 Test results of damp deflection of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例24Example 24	0.90.9
实施例25Example 25	1.51.5
实施例26Example 26	1.31.3
实施例27Example 27	1.61.6
对比例31Comparative example 31	5.65.6
对比例31-1Comparative example 31-1	3.73.7
对比例32Comparative example 32	6.56.5
对比例32-1Comparative example 32-1	4.04.0
对比例33Comparative example 33	8.98.9
对比例33-1Comparative example 33-1	7.57.5
对比例34Comparative example 34	6.06.0

From the conclusion of Test Example 21, it can be seen that Examples 24, 25, 26, and 27 of the present application used desulfurized gypsum with high chloride ion content to prepare gypsum board, and the damp deflection of gypsum board after adopting the technical solution of the present application It is significantly lower than the comparative example and the commercially available ordinary gypsum board.

Example 28

In the paper-faced gypsum board prepared in this example, the content of water-soluble magnesium oxide in the raw material desulfurized gypsum raw meal is 0.38 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 0.5 parts by weight of zeolite. The zeolite and the desulfurized gypsum raw material are fully mixed evenly and enter the grinding body of the hammer-type disperser. The material is dispersed while drying, and the rotating rotor will The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

Step 3: Cool the material to 35°C to further stabilize the phase composition.

Step 4: Weigh 0.06 parts by weight of medium-alkali glass fiber (glass fiber length is 9mm, fiber monofilament diameter is 10μm), and mechanically stir it with the cooled material and mix evenly to prepare a mixture.

Example 29

In the paper-faced gypsum board prepared in this embodiment, the content of water-soluble magnesium oxide in the raw material desulfurized gypsum raw meal is 1.5 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 3.7 parts by weight of zeolite. The zeolite and the desulfurized gypsum raw material are fully mixed evenly and enter the grinding body of the hammer-type disperser to disperse the materials while drying. The rotating rotor will The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

Step 3: Cool the material to 55°C to further stabilize the phase composition.

Step 4. Weigh 0.09 parts by weight of alkali-free glass fiber (glass fiber length is 15mm, fiber monofilament diameter is 15μm), mechanically stir it with the cooled material, and mix uniformly to prepare a mixture.

Example 30

In the paper-faced gypsum board prepared in this embodiment, the content of water-soluble magnesium oxide in the raw material desulfurized gypsum raw meal is 2.35 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 6.9 parts by weight of zeolite. The zeolite and the desulfurized gypsum raw material are fully mixed uniformly, and enter the grinding body of the hammer disperser. The material is dispersed while drying, and the rotating rotor will The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

Step 2: The material enters the ball mill to be milled until the specific surface area of the desulfurized gypsum clinker is 4000 cm ² /g

Step 3: Cool the material to 75°C to further stabilize the phase composition.

Comparative example 35

The desulfurized gypsum of Example 28 was used to prepare gypsum board, and zeolite was not added in step one; in step seven, water was sprayed without spraying the mixture of starch and zeolite. The remaining components are the same as in Example 28, and the other steps of making gypsum board are also the same as in Example 28.

Comparative example 35-1

The desulfurized gypsum of Example 28 was used to prepare gypsum board. In step one, zeolite was added; in step seven, water was sprayed, and the mixture of starch and zeolite was not sprayed. The remaining components are the same as in Example 28, and the other steps of making gypsum board are also the same as in Example 28.

Comparative example 36

The desulfurized gypsum board of Example 28 is used to prepare gypsum board. No zeolite is added in step 1. Step 7 is to spray a mixed solution of water and starch. The remaining components are the same as in Example 28. The other steps of making gypsum board are also Embodiment 28 is the same.

Comparative example 36-1

The desulfurized gypsum of Example 29 was used to prepare paper-faced gypsum board, and zeolite was added in step one; and in step seven, zeolite powder was evenly sprayed on the surface of the face protection paper. The rest of the components are the same as in Example 29, and the other steps of making gypsum board are also the same as in Example 29.

Comparative example 36-2

The desulfurized gypsum of Example 29 was used to prepare gypsum board, and zeolite was not added in step one; step seven was cancelled. The rest of the components are the same as in Example 29, and the other steps of making gypsum board are also the same as in Example 29.

Comparative example 37

The desulfurized gypsum of Example 30 was used to prepare gypsum board. In step one, zeolite was not added, and in step one, fly ash with the same weight of zeolite was added. The rest of the components are the same as in Example 30, and the other steps of making gypsum board are also the same as in Example 30.

Comparative example 37-1

The desulfurized gypsum of Example 30 was used to prepare gypsum board. In step 1, zeolite was not added, and in step 1, diatomaceous earth was added with the same weight of zeolite. The remaining components are the same as in Example 30, and the other steps of making gypsum board are also the same as in Example 3.

Comparative example 38

Commercially available ordinary gypsum board, Hebei Antai Gypsum Board Co., Ltd., 9.5mm thick ordinary gypsum board.

Test case 22

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples to test the physical and mechanical properties of the paper-faced gypsum board. The results are shown in Table 22.

Table 22 Performance Test Results of Gypsum Board

It can be seen from Table 22 that the paper-faced gypsum board prepared in the examples of this application can meet the physical and mechanical properties required by the building materials industry standards in terms of performance. The performance of the comparative example is similar to that of the examples, indicating that the addition of zeolite and the spraying of the mixture of starch and zeolite on the face protection paper will not affect the mechanical properties of the gypsum board.

Test case 23

Table 23 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例28Example 28	AA	AA	AA
实施例29Example 29	AA	AA	AA
实施例30Example 30	AA	AA	AA
对比例35Comparative example 35	BB	EE	EE
对比例35-1Comparative example 35-1	AA	CC	DD
对比例36Comparative example 36	BB	CC	EE
对比例36-1Comparative example 36-1	AA	BB	CC
对比例36-2Comparative example 36-2	CC	EE	EE
对比例37Comparative example 37	BB	EE	EE
对比例37-1Comparative example 37-1	BB	EE	EE
对比例38Comparative example 38	AA	EE	DD

The performance index testing in this application is based on Chinese national and industry standards. It can be seen from Table 23 that the gypsum boards prepared in Examples 28, 29, and 30 of the present application have better bonding effects than the comparative examples under humid, hot, and high-humidity environmental conditions. Compared with the comparative examples, the two technical methods of adding zeolite inside the gypsum board core and spraying a layer of starch and zeolite mixture on the face protection paper have complementary effects, and have a complementary effect on the adhesion of the face protection paper and the board core. The knot performance is enhanced.

Test case 24

Table 24 Test results of moisture deflection of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例28Example 28	1.31.3
实施例29Example 29	1.21.2
实施例30Example 30	1.51.5
对比例35Comparative example 35	5.35.3
对比例35-1Comparative example 35-1	2.92.9
对比例36Comparative example 36	3.93.9
对比例36-1Comparative example 36-1	3.03.0
对比例36-2Comparative example 36-2	5.25.2
对比例37Comparative example 37	5.65.6
对比例37-1Comparative example 37-1	6.36.3
对比例38Comparative example 38	5.55.5

From the conclusion of Test Example 24, it can be seen that Examples 28, 29, and 30 of the present application are gypsum boards prepared with desulfurized gypsum with high magnesium oxide content. The core is mixed with zeolite and the surface of the protective paper is sprayed with starch and The technical effect of the zeolite mixture is obviously better than that of Comparative Example 37, Comparative Example 37-1, and Comparative Example 38. It shows that adding zeolite to the plate core can obtain a more improved effect on moisture deflection than adding fly ash or diatomaceous earth. The technical measures of this application have a significant improvement effect on the damp deflection of the gypsum board, which is better than the common gypsum board on the market.

Comparative Example 35, Comparative Example 35-1, Comparative Example 36, Comparative Example 36-1, and Comparative Example 36-2, compared with Examples 28, 29, and 30, show that adding zeolite to the desulfurized gypsum raw material has the same effect on the face paper The two technical methods of spraying the mixture of zeolite and starch are complementary to each other, and jointly affect the performance of preparing paper-faced gypsum board from desulfurized gypsum with high magnesium oxide content.

Example 31

In the paper-faced gypsum board prepared in this example, the content of water-soluble sodium oxide in the raw material desulfurized gypsum raw meal is 0.24 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 3: Cool the material to 35°C to further stabilize the phase composition.

Example 32

In the paper-faced gypsum board prepared in this example, the content of water-soluble sodium oxide in the raw material desulfurized gypsum raw meal is 0.45 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 3: Cool the material to 55°C to further stabilize the phase composition.

Example 33

In the paper-faced gypsum board prepared in this example, the content of water-soluble sodium oxide in the raw material desulfurized gypsum raw meal is 1.28 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 3: Cool the material to 75°C to further stabilize the phase composition.

Step 7: Spray a layer of mixed solution of starch solution and zeolite on the protective paper of the forming table in advance. The weight ratio of water: modified corn starch: zeolite is 100:6:4. The amount of water is 3% of the weight of the desulfurized gypsum raw meal.

Example 34

In the paper-faced gypsum board prepared in this example, the content of water-soluble sodium oxide in the raw material desulfurized gypsum raw meal is 1.98 wt.%.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 9.7 parts by weight of zeolite. The zeolite and the desulfurized gypsum raw material are fully mixed evenly and enter the grinding body of the hammer disperser. The material is dispersed while drying, and the rotating rotor The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO4·2H2O) is quickly dehydrated to become plaster of Paris (CaSO4·1/2H2O, CaSO4) after being heated.

Step 3: Cool the material to 80°C to further stabilize the phase composition.

Step 4. Weigh 0.18 parts by weight of glass fiber, mechanically stir it with materials, and mix them evenly.

Step 5. Weigh 73 parts by weight of water, 0.6 parts by weight of retarder, and 0.75 parts by weight of modified corn starch, and mix them evenly.

Step 6. Add the mixture of desulfurized gypsum clinker, zeolite and glass fiber to the mixed solution to make gypsum slurry.

Step 9. The wet plate is solidified on the conveyor belt. After being cut off, it enters the dryer and passes through three drying stages: the drying time of the first drying stage is 0.6h and the drying temperature is 165℃; the drying time of the second drying stage is 1.2 h, the drying temperature is 110°C; the drying time of the third drying stage is 24h, and the drying temperature is 50°C.

Comparative example 39

The desulfurized gypsum of Example 31 was used to prepare gypsum board. In step 1, zeolite was not added; in step 7, only water was sprayed, and the mixture of starch and zeolite was not sprayed. The rest of the components are the same as in Example 31, and the other steps of making gypsum board are also the same as in Example 31.

Comparative Example 39-1

The desulfurized gypsum of Example 31 was used to prepare paper-faced gypsum board, and zeolite was added in step one; in step seven, water was sprayed without spraying the mixture of starch and zeolite. The remaining components are the same as in Example 31, and the other steps of making gypsum board are also the same as in Example 31.

Comparative example 40

The desulfurized gypsum board of Example 31 was used to prepare gypsum board. No zeolite was added in step 1. Step 7 was to spray a mixed solution of water and starch. The remaining components were the same as in Example 31. The other steps for making gypsum board were also Embodiment 31 is the same.

Comparative example 40-1

The desulfurized gypsum of Example 32 was used to prepare paper-faced gypsum board, and zeolite was added in step one; and in step seven, zeolite powder was evenly sprayed on the surface of the protective paper. The remaining components are the same as in Example 32, and the other steps of making gypsum board are also the same as in Example 32.

Comparative example 41

The desulfurized gypsum of Example 33 was used to prepare gypsum board. In step 1, no zeolite was added, and the same weight of fly ash as the zeolite was added. The rest of the components are the same as in Example 33, and the other steps of making plasterboard are also the same as in Example 33.

Comparative example 41-1

The desulfurized gypsum of Example 33 was used to prepare gypsum board. In step 1, zeolite was not added, and the same weight of diatomaceous earth as zeolite was added. The rest of the components are the same as in Example 33, and the other steps of making plasterboard are also the same as in Example 33.

Comparative example 42

Commercially available ordinary gypsum board, Jinzhou Leading Gypsum Board Factory, Shijiazhuang City, Hebei Province, China, 9.5mm thick ordinary gypsum board.

Test case 25

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples to test the physical and mechanical properties of the paper-faced gypsum board. The results are shown in Table 25.

Table 25 Performance test results of gypsum board

It can be seen from Table 25 that the paper-faced gypsum board prepared in the examples of this application can meet the physical and mechanical properties required by the building materials industry standard in terms of performance. The performance of the comparative example is similar to that of the examples, indicating that the addition of zeolite and the spraying of the mixture of starch and zeolite on the protective paper will not affect the mechanical properties of the gypsum board.

Test case 26

Table 26 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例31Example 31	AA	AA	AA
实施例32Example 32	AA	AA	AA
实施例33Example 33	AA	AA	AA
实施例34Example 34	AA	AA	AA
对比例39Comparative example 39	BB	EE	EE
对比例39-1Comparative Example 39-1	AA	AA	AA
对比例40Comparative example 40	DD	EE	EE
对比例40-1Comparative example 40-1	AA	AA	BB
对比例41Comparative example 41	EE	EE	EE
对比例41-1Comparative example 41-1	AA	BB	BB
对比例42Comparative example 42	EE	EE	EE

The performance index testing in this application is based on national and industry standards. As can be seen from Table 26, this application

The gypsum boards prepared in Examples 31, 32, 33, and 34 have better bonding effects under humid, hot, and high-humidity environmental conditions than other comparative examples except Comparative Example 39-1. The paper prepared in Comparative Example 39-1 Although the gypsum board is not sprayed with a mixture containing zeolite on the face protection paper, the zeolite in the core of the board is mixed with the desulfurized gypsum raw meal, and the desulfurized gypsum raw meal is converted to clinker to a certain extent. "It improves the ability of the zeolite in the plate core to adsorb impurity ions, thereby reducing the influence of impurity ions on the bonding effect, so the bonding effect is also better under hot, humid and high humidity environmental conditions. Compared with the comparative examples, the two technical methods of adding zeolite inside the gypsum board core and spraying a layer of starch and zeolite mixture on the face protection paper have complementary effects, and have a complementary effect on the adhesion of the face protection paper and the board core. The knot performance is enhanced.

Test case 27

Table 27 Test results of damp deflection of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例31Example 31	1.01.0
实施例32Example 32	1.11.1
实施例33Example 33	1.41.4
实施例34Example 34	1.31.3
对比例39Comparative example 39	3.43.4
对比例39-1Comparative Example 39-1	3.63.6
对比例40Comparative example 40	2.72.7
对比例40-1Comparative example 40-1	3.03.0
对比例41Comparative example 41	3.53.5
对比例41-1Comparative example 41-1	3.33.3
对比例42Comparative example 42	4.54.5

It can be seen from the conclusion of Test Example 27 that the gypsum board prepared by the technical measures of this application (Examples 31, 32, 33 and 34) and Comparative Examples 39, 39-1, 40, 40-1, 41, 41 Compared with -1,42, it can significantly reduce the deflection of gypsum board.

Example 35

In the gypsum board prepared in this embodiment, the raw material desulfurized gypsum raw meal contains water-soluble sodium oxide content of 0.24wt.%, water-soluble magnesium oxide content of 0.25wt.%, water-soluble potassium oxide content of 2.2wt.%, and chloride ion The content is 689ppm.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 0.65 parts by weight of zeolite. The zeolite and desulfurized gypsum raw material are fully mixed evenly, and enter the grinding body of the hammer disperser. The material is dispersed while drying, and the rotating rotor will The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

Step 3: Cool the material to 36°C to further stabilize the phase composition.

Step 4. Weigh 0.07 parts by weight of medium-alkali glass fiber (glass fiber length is 9mm, fiber monofilament diameter is 10μm), and mechanically stir it with the cooled material and mix evenly to prepare a mixture.

Step 5. Weigh 69 parts by weight of water, 0.24 parts by weight of protein-based gypsum retarder formed by calcium salting of degraded polyamide, and 0.25 parts by weight of modified corn starch, and mix them to form a mixed solution.

Example 36

In the gypsum board prepared in this example, the raw material desulfurized gypsum raw meal contains water-soluble sodium oxide content of 0.24wt.%, water-soluble magnesium oxide content of 1.75wt.%, water-soluble potassium oxide content of 0.52wt.%, and chloride ion The content is 1358ppm.

The specific steps for preparing gypsum board are as follows:

Step 3: Cool the material to 53°C to further stabilize the phase composition.

Step 5: Weigh 72 parts by weight of water, 0.54 parts by weight of bone glue protein retarder, and 0.56 parts by weight of modified corn starch, and mix them to form a mixed solution.

Step 7. Spray a layer of mixed solution of starch solution and attapulgite clay on the protective paper of the forming table in advance. The weight ratio of water: modified corn starch: attapulgite clay is 100:5:3. The amount of water used is 3% of the weight of the desulfurized gypsum raw meal.

Example 37

In the gypsum board prepared in this example, the raw material desulfurized gypsum raw meal contains water-soluble sodium oxide content of 0.14wt.%, water-soluble magnesium oxide content of 0.35wt.%, water-soluble potassium oxide content of 1.38wt.%, and chloride ion The content is 3672ppm.

The specific steps for preparing gypsum board are as follows:

Step 3: Cool the material to 76°C to further stabilize the phase composition.

Step 5. Weigh 78 parts by weight of water, 0.65 parts by weight of protein-based gypsum retarder formed by calcium salting of degraded polyamide, and 0.74 parts by weight of modified corn starch, and mix them to form a mixed solution.

Step 7. Spray a layer of mixed solution of starch solution and bentonite on the protective paper of the forming table in advance. The weight ratio of water: modified corn starch: zeolite is 100:6:4. The amount of water is 3% of the weight of the desulfurized gypsum raw meal.

Example 38

In the gypsum board prepared in this example, the raw material desulfurized gypsum raw meal contains water-soluble sodium oxide content of 0.08wt.%, water-soluble magnesium oxide content of 1.32wt.%, water-soluble potassium oxide content of 0.56wt.%, and chloride ion The content is 6265ppm.

The specific steps for preparing gypsum board are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum raw material and 9.8 parts by weight of zeolite. The zeolite and the desulfurized gypsum raw material are fully mixed evenly, and enter the grinding body of the hammer disperser. The material is dispersed while drying, and the rotating rotor will The materials are ground and dried by hot air. After the hot gas directly contacts the green gypsum, heat conduction occurs, and the green gypsum (CaSO ₄ ·2H ₂ O) is quickly dehydrated after being heated to become plaster of paris (CaSO ₄ ·1/2H ₂ O, CaSO ₄ ).

Step 3: Cool the material to 78°C to further stabilize the phase composition.

Step 4: Weigh 0.19 parts by weight of alkali-free glass fiber (glass fiber length is 10mm, fiber monofilament diameter is 10μm), and mechanically stir it with the material to mix evenly.

Step 5. Weigh 67 parts by weight of water, 0.65 parts by weight of retarder, and 0.76 parts by weight of modified corn starch, and mix them evenly.

Step 10. The dried boards are combined, sawed, edge sealed, and packaged to form gypsum board.

Comparative example 43

The desulfurized gypsum of Example 35 was used to prepare gypsum board, and zeolite was not added in step one; in step seven, only water was sprayed, and the mixture of starch and zeolite was not sprayed. The rest of the components are the same as in Example 35, and the other steps of making gypsum board are also the same as in Example 35.

Comparative example 44

The desulfurized gypsum of Example 35 was used to prepare gypsum board, and zeolite was added in step one; in step seven, only water was sprayed, and the mixture of starch and zeolite was not sprayed. The remaining components are the same as in Example 35, and the other steps of making gypsum board are also the same as in Example 35.

Comparative example 45

The desulfurized gypsum board of Example 35 was used to prepare gypsum board. No zeolite was added in step 1. Step 7 was to spray a mixed solution of water and starch. The remaining components were the same as in Example 35. Other steps for making gypsum board were also Example 35 is the same.

Comparative example 46

The desulfurized gypsum of Example 36 was used to prepare paper-faced gypsum board, and zeolite was added in step one; and in step seven, attapulgite clay was evenly sprayed on the surface of the protective paper. The rest of the components are the same as in Example 36, and the other steps of making gypsum board are also the same as in Example 36.

Comparative example 47

Test case 28

Refer to the Chinese national standard GB/T9775-2008 "Paper-faced Gypsum Board" to test the examples and comparative examples to test the physical and mechanical properties of the gypsum board. The results are shown in Table 28.

Table 28 Performance test results of gypsum board

It can be seen from Table 28 that the paper-faced gypsum boards prepared in the examples of the present application can meet the physical and mechanical properties required by the building materials industry standards in terms of performance. The performance of the comparative example is similar to that of the examples, indicating that the addition of zeolite and the spraying of the mixture of starch and zeolite on the protective paper will not affect the mechanical properties of the gypsum board.

Test case 29

Table 29 Test results of bonding performance of gypsum board

To	干粘结Dry bonding	湿热粘结Moist heat bonding	高湿粘结High humidity bonding
实施例35Example 35	AA	AA	AA

实施例36Example 36	AA	AA	AA
实施例37Example 37	AA	AA	AA
实施例38Example 38	AA	AA	AA
对比例43Comparative example 43	DD	EE	EE
对比例44Comparative example 44	BB	EE	EE
对比例45Comparative example 45	DD	EE	EE
对比例46Comparative example 46	AA	BB	BB
对比例47Comparative example 47	AA	EE	EE

The performance index testing in this application is based on Chinese national and industry standards. It can be seen from Table 29 that the gypsum boards prepared in Examples 35, 36, 37, and 38 of the present application have better bonding effects than the comparative examples under humid, hot, and high-humidity environmental conditions. Compared with the comparative examples, the two technical methods of adding zeolite inside the gypsum board core and spraying a layer of starch and zeolite mixture on the face protection paper have complementary effects, and have a complementary effect on the adhesion of the face protection paper and the board core. The knot performance is enhanced.

Test case 30

Table 30 Test results of moisture deflection of gypsum board

To	受潮挠度，mm。(32±2)℃，(90±3)％Moisture deflection, mm. (32±2)℃, (90±3)%
实施例35Example 35	1.11.1
实施例36Example 36	1.01.0
实施例37Example 37	1.31.3
实施例38Example 38	1.21.2
对比例43Comparative example 43	3.63.6
对比例44Comparative example 44	2.52.5

对比例45Comparative example 45	3.93.9
对比例46Comparative example 46	1.91.9
对比例47Comparative example 47	2.52.5

From the conclusion of Test Example 30, it can be seen that the gypsum board prepared by using Example 35 to Example 37 of the present application can significantly reduce the deflection of the gypsum board compared with Comparative Example 43 to Comparative Example 47.

Example 39

The preparation steps of the gypsum board prepared in this embodiment are as follows:

Step 1. Mix and stir 68 parts by weight of water and 0.5 parts by weight of modified starch (with a particle size of 100 mesh) to prepare a mixed solution; add clinoptilolite (with a particle size of 250 mesh and a pore size of 0.6 nm) at 250 Roasted at ℃ for 2h to obtain modified clinoptilolite;

Step 2: Mix 100 parts of desulfurized gypsum raw meal with a chloride ion content of 586 mg/kg and 9 parts by weight of modified clinoptilolite uniformly, and calcinate at 150°C for 1 hour to prepare a mixture;

Step 3: Mix the mixture prepared in step 1 and the mixture prepared in step 2 uniformly to obtain gypsum slurry, and lap the gypsum slurry and masking paper to form a wet board;

Step 4: Transport the above-mentioned shaped board to a drying kiln, dry at 150°C for half an hour, transfer to 100°C for 1 hour, and finally transfer to 40°C to dry to constant weight.

Example 40

Step 1. Mix 65 parts by weight of water and 5 parts by weight of modified starch (with a particle size of 80 mesh) to prepare a mixed solution; put analcime (with a particle size of 325 mesh and a pore size of 0.45 nm) at 300°C Roasted for 1.5h to obtain modified analcime;

Step 2: Mix 100 parts of desulfurized gypsum raw meal with a chloride ion content of 672mg/kg and 5 parts by weight of modified analcime uniformly, and calcinate at 110°C for 2 hours to prepare a mixture;

Step 4. Transport the above-mentioned shaped board to a drying kiln, dry at 160°C for half an hour, transfer to 110°C for 1 hour, and finally transfer to 45°C to dry to constant weight.

Example 41

Step 1. Mix 68 parts by weight of water and 9 parts by weight of modified starch (with a particle size of 150 mesh) to prepare a mixed solution; add clinoptilolite (with a particle size of 200 mesh and a pore size of 0.8 nm) at 550 Roasted at ℃ for 1h to obtain modified clinoptilolite;

Step 2: Mix 100 parts of desulfurized gypsum raw meal with a chloride ion content of 586 mg/kg and 10 parts by weight of modified clinoptilolite to prepare a mixture;

Step 4. Transport the above-mentioned shaped board to a drying kiln, dry at 175°C for half an hour, transfer to 120°C for 1 hour, and finally transfer to 58°C to dry to constant weight.

Example 42

Step 1. Mix 57 parts by weight of water and 9 parts by weight of modified starch (with a particle size of 100 mesh) to prepare a mixed solution; add clinoptilolite (with a particle size of 225 mesh and a pore size of 0.5 nm) at 350 Roasted at ℃ for 1.5h to obtain modified clinoptilolite;

Step 2: Mix 100 parts of desulfurized gypsum raw meal with a chloride ion content of 672mg/kg and 1 part by weight of modified clinoptilolite uniformly, and calcinate at 130°C for 1.5 hours to prepare a mixture;

Example 43

Step 1. Mix and stir 67 parts by weight of water and 9 parts by weight of modified starch (with a particle size of 80 mesh) to prepare a mixed solution; the clinoptilolite (with a particle size of 325 mesh and a pore size of 0.6 nm) at 360 Roasted at ℃ for 1.5h to obtain modified clinoptilolite;

Step 2: Mix 100 parts of desulfurized gypsum raw meal with a water-soluble magnesium oxide content of 2.0% by weight and 1 part by weight of modified clinoptilolite, and calcinate at 130°C for 1.5 hours to prepare a mixture;

Example 44

Step 1. Mix 55 parts by weight of water and 6 parts by weight of modified starch (with a particle size of 100 mesh) to prepare a mixed solution; set the clinoptilolite (with a particle size of 300 mesh and a pore size of 0.55 nm) at 300 Roasted at ℃ for 2h to obtain modified clinoptilolite;

Step 2: Mix 100 parts of desulfurized gypsum raw meal with a water-soluble sodium oxide content of 0.2 wt.% and 1 part by weight of modified clinoptilolite uniformly, and calcinate at 130°C for 1.5 hours to prepare a mixture;

Example 45

The raw material ratio of the gypsum board is the same as in Example 39, and the preparation steps 1 and 2 are the same as in Example 39.

Step 3. Spray a layer of starch solution and zeolite mixture on the protective paper of the forming table in advance; the weight ratio of water: modified corn starch: zeolite is 100:3:1, and the amount of water used is desulfurized gypsum 3% of material weight.

Step four is the same as step three of embodiment 39.

Step five is the same as step four of embodiment 39.

Comparative example 48

The difference from the embodiment is that no zeolite is added, and the preparation steps are as follows:

Step 1. Mix and stir 55 parts by weight of water and 0.5 parts by weight of modified starch (with a particle size of 150 mesh) to prepare a mixed solution;

Step two: calcining 100 parts of raw desulfurized gypsum with a chloride ion content of 672 mg/kg at 130°C for 1.5 hours to prepare gypsum clinker;

Step 3: Mix the mixture prepared in step 1 with the gypsum clinker prepared in step 2 to obtain a gypsum slurry, and the gypsum slurry and the protective paper are lapped and adhered firmly to form a wet board;

Comparative example 49

The difference from the embodiment is that diatomite is used instead of zeolite, and the preparation steps are as follows:

Step 1. Mix 57 parts by weight of water and 9 parts by weight of modified starch (with a particle size of 100 mesh) to prepare a mixed solution;

Step 2: Mix 100 parts of desulfurized gypsum raw meal with a chloride ion content of 672mg/kg and 1 part by weight of diatomaceous earth uniformly, and calcinate at 120°C for 1.5 hours to prepare a mixture;

Diatomite and zeolite have the same characteristics of large porosity and strong adsorption performance. The pore diameter of diatomite is about 7nm to 125nm. After modification, the diameter of zeolite pores can be increased from 0.4nm to 0.6nm to 0.8nm. Zeolite The pores of zeolite can hinder the entry of large-diameter molecules or ions, selective exchange and adsorption performance, selective adsorption can prevent macromolecules from encroaching on the pores, reducing the ion adsorption utilization rate of mineral materials; at the same time, the modification step of zeolite reduces the After the impurities are removed, the ion adsorption rate of the zeolite can be further improved.

Test case 31

According to the Chinese national standard GBT 17669.4-1999 "Determination of the physical properties of building gypsum paste", the strength of the gypsum boards of the above examples and comparative examples were tested. The flexural strength and compressive strength were compared with the comparative examples. The data is shown in the table below.

Table 31 Test results of flexural and compressive strength

类别category	抗折强度(MPa)Flexural strength (MPa)	抗压强度(MPa)Compressive strength (MPa)
对比例48Comparative example 48	6.306.30	19.619.6
对比例49Comparative example 49	6.106.10	17.10817.108
实施例39Example 39	8.38.3	22.122.1
实施例40Example 40	8.58.5	22.522.5
实施例41Example 41	7.97.9	21.221.2
实施例42Example 42	7.57.5	21.521.5
实施例43Example 43	8.08.0	21.921.9
实施例44Example 44	7.87.8	21.721.7
实施例45Example 45	8.48.4	22.222.2

It can be seen from Table 31 that the paper-faced gypsum board prepared in the examples of the present application can meet the physical and mechanical properties required by the building materials industry standard in terms of performance. Compared with Comparative Example 48 and Comparative Example 49, Examples 39 to 45 have better performance than Comparative Example. It shows that zeolite can significantly improve the flexural and compressive strength of gypsum specimens.

Test case 32

In this application, the sample is tested for the breaking load after damp. The test conditions of gypsum board under dampness refer to the test conditions of damp deflection test of gypsum board in China National Standard GB/T9775-2008. The temperature is 32±2℃ and humidity is 90±3%. After placing the gypsum board in a damp deflection test box for 48 hours, the transverse and longitudinal breaking loads of the board were tested. The improvement of gypsum board breaking load after being damp is shown in Table 32.

Table 32 Comparison table of breaking load after damp/N

It can be seen from the conclusion of Test Example 32 that in Examples 39 to 45 of this application, desulfurized gypsum with high impurity ions is used to prepare gypsum board, and the board mixed with modified natural zeolite has significantly better fracture performance after exposure to moisture. Gypsum board without zeolite. By comparing Examples 39 to 45 and Comparative Example 49, it can be seen that zeolite is significantly better than diatomaceous earth in improving the fracture load of gypsum board after damp.

Test case 33

This application tests the dry and wet bonding of gypsum board to determine the change in the bonding effect of gypsum board: the bonding performance is divided into 5 levels, A: the cardboard is firmly bonded and does not separate after lifting; B: a small part is separated, the majority Intact; C grade: half of the sticky, half separated; D grade: most of the separation, only a small part of the stick; E grade: all the cardboard separated.

The dry bonding test is carried out by the cross knife method. The wet bonding test of this application is based on the "Beixin Building Materials Gypsum Board Zhuozhou Plant Board Bonding Performance Testing Method SGZJ013-2014". A small board of about 160×40mm is cut out and placed in 98 Keep time in a constant temperature water bath at ±2℃ and take it out after 12 minutes. Cut the board from the middle of the longitudinal direction, and pull up the two-sided face protection paper along the broken part, observe the combination of the face protection paper and the plaster core at the pulled part, and judge according to the judgment standard.

Through testing, the following experimental conclusions are obtained:

Table 33 Bonding performance test results

类别category	干粘结Dry bonding	湿热粘结Moist heat bonding
实施例39Example 39	AA	AA

实施例40Example 40	AA	AA
实施例41Example 41	AA	AA
实施例42Example 42	AA	AA
实施例43Example 43	AA	AA
实施例44Example 44	AA	AA
实施例45Example 45	AA	AA
对比例48Comparative example 48	AA	EE
对比例49Comparative example 49	AA	DD

The performance index testing in this application is based on national and industry standards. It can be seen from Table 33 that the gypsum board prepared in Example 39 to Example 45 of the present application has better bonding effects than Comparative Example 48 and Comparative Example 49 under humid, hot, and high-humidity environmental conditions. The paper-faced gypsum board improves the effect of poor adhesion of the paper-faced gypsum board prepared when high-impurity ion desulfurized gypsum is used as a raw material.

The present disclosure is an example of the principles of the embodiments of the application, and does not limit the application in any form or substance, or limit the application to specific embodiments. To those skilled in the art, it is obvious that the elements, methods, and systems of the technical solutions of the embodiments of the present application can be changed, changed, modified, and evolved without departing from the embodiments and technical solutions of the present application as described above. , As defined in the claims, the principle, spirit and scope. The implementation schemes of these changes, changes, modifications, and evolutions are all included in the equivalent embodiments of the present application, and these equivalent embodiments are all included in the scope defined by the claims of the present application. Although the embodiments of the present application can be embodied in many different forms, some embodiments of the present application are described in detail here. In addition, the examples of the present application include any possible combination of some or all of the various embodiments described herein, and are also included in the scope of the present application defined by the claims. All patents, patent applications and other cited materials mentioned in this application or anywhere in any cited patent, cited patent application or other cited materials are hereby incorporated by reference in their entirety.

The above disclosure is provided as illustrative rather than exhaustive. For those skilled in the art, this description will suggest many changes and alternatives. All these alternatives and variations are intended to be included within the scope of the claims, where the term "including" means "including, but not limited to."

This completes the description of the alternative embodiments of the application. Those skilled in the art may recognize other equivalent transformations of the embodiments described herein, and these equivalent transformations are also encompassed by the claims attached herein.

Claims

A high impurity ion content desulfurized gypsum paper-faced gypsum board. The paper-faced gypsum board comprises a core and a protective paper on the outside of the core. The raw materials of the core include the following components: 100 parts by weight of raw desulfurized gypsum and 0.5 parts by weight to 10 parts by weight of zeolite;

The desulfurized gypsum raw meal is selected from any one or more of high-sodium desulfurized gypsum raw meal, high-magnesium desulfurized gypsum raw meal, high-potassium desulfurized gypsum raw meal, and high-chlorine desulfurized gypsum raw meal;

The content of water-soluble sodium oxide in the high sodium desulfurized gypsum raw meal is x, 0.08wt.%<x≤1.98wt.%;

The content of water-soluble magnesium oxide in the high-magnesium desulfurized gypsum raw meal is y, 0.2wt.%<y≤2.5wt.%;

The content of water-soluble potassium oxide in the high potassium desulfurized gypsum raw meal is z, 0.2wt.%<z≤2.5wt.%;

The chloride ion content in the high-chlorine desulfurized gypsum raw meal is w, 421mg/kg≤w≤8000mg/kg; and,

The zeolite is a modified zeolite; or, the side of the protective paper that is in contact with the plate core has an adsorption material, and the adsorption material is selected from zeolite, diatomaceous earth, fly ash, and attapulgite clay And any one or more of bentonite.
The high impurity ion content desulfurized gypsum gypsum board according to claim 1, wherein the modified zeolite has a specific surface area of 500 m 2 /g to 1000 m 2 /g, and a pore diameter of 0.40 nm to 0.80 nm.
The high impurity ion content desulfurized gypsum paper-faced gypsum board according to claim 1 or 2, wherein the specific surface area of zeolite, attapulgite clay, and bentonite in the adsorbent is 500m 2 /g to 2000m 2 /g, and the pore size It is 0.40nm to 0.60nm.
The high impurity ion content desulfurized gypsum gypsum board according to any one of claims 1 to 3, wherein the raw material of the board core includes the following components: 100 parts by weight of desulfurized gypsum raw material, 50.6 parts by weight of water to 80 parts by weight, 0.4 parts by weight to 10 parts by weight of zeolite, 0.04 parts by weight to 0.2 parts by weight of glass fiber, 0.17 parts by weight to 1 part by weight of retarder, and 0.17 parts by weight to 1 part by weight of starch.
The high impurity ion content desulfurized gypsum paper-faced gypsum board according to claim 4, wherein the glass fiber is selected from any one or more of medium-alkali glass fiber, alkali-free glass fiber and alkali-resistant glass fiber; Optionally, the length of the glass fiber is 9 mm to 15 mm, and the fiber filament diameter is 10 μm to 15 μm;

Optionally, the retarder is selected from citric acid, sodium citrate, magnesium citrate, sodium hexametaphosphate, magnesium hexametaphosphate, borax, lignosulfonate, sodium carboxymethyl cellulose, hydroxyethyl Any one or more of cellulose, phosphoric acid, and protein-based retarders; optionally, the protein-based gypsum retarder is selected from the group consisting of bone glue protein retarders and degraded polyamides formed by calcium salting Any one or more of protein gypsum retarders;

Optionally, the starch in the board core is modified starch, and the modified starch is selected from any one or more of modified potato starch, modified tapioca starch, modified sorghum starch and modified corn starch .
The high impurity ion content desulfurized gypsum gypsum board according to any one of claims 1 to 3, wherein the zeolite in the board core is a modified natural zeolite, and the raw materials of the board core include the following components: 100 parts by weight of desulfurized gypsum raw meal, 0.5 to 10 parts by weight of modified starch, 50 to 70 parts by weight of water, and 1 to 10 parts by weight of modified natural zeolite.
The high impurity ion content desulfurized gypsum gypsum board according to claim 6, wherein the modified natural zeolite is a natural zeolite calcined at a high temperature; optionally, the natural zeolite is selected from analcime, mordenite and Any one or more of clinoptilolite; optionally, the particle size of the natural zeolite is 80 mesh to 400 mesh, and optionally 200 mesh to 325 mesh; optionally, the natural zeolite The pore size is 0.4nm to 0.8nm;

Optionally, the particle size of the modified starch in the core is 80 mesh to 150 mesh.
The method for preparing high impurity ion content desulfurized gypsum gypsum plasterboard according to any one of claims 1 to 5, comprising:

(1) Pretreat the zeolite used to prepare the plate core and activate it: roast the zeolite to remove organic matter, rinse with water after cooling to room temperature, and dry to constant weight after rinsing;

(2) Calcining desulfurized gypsum raw meal to obtain desulfurized gypsum clinker;

(3) The desulfurized gypsum clinker, glass fiber and pretreated zeolite are mechanically stirred and mixed evenly to prepare a mixture;

(4) Weigh water, retarder and starch, mix them evenly to prepare mixed solution 1;

(5) Add the mixture obtained in step (3) to the mixture 1 obtained in step (4) to make a gypsum slurry; optionally, (5') pre-coating or spraying starch on the protective paper The mixed solution of the aqueous solution and the adsorption material 2;

(6) The evenly stirred gypsum slurry and the protective paper are lapped and glued to form a wet board;

(7) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board.
The method for preparing high impurity ion content desulfurized gypsum gypsum plasterboard according to any one of claims 1 to 5, comprising:

(1) Pretreat the zeolite and activate it: roast the zeolite to remove organic matter, rinse with water after cooling to room temperature, and dry to constant weight after rinsing;

(2) Calcining desulfurized gypsum raw meal to obtain desulfurized gypsum clinker;

(3) Mechanically stir and mix the desulfurized gypsum clinker and glass fiber to make a mixture;

(4) Weigh water, retarder, pretreated zeolite and starch, and mix them evenly to prepare mixed solution 1;

(5) Add the mixture obtained in step (3) to the mixture 1 obtained in step (4) to make a gypsum slurry;

Optionally, (5') pre-coating or spraying the mixed solution 2 of the aqueous solution of starch and the absorbent material on the face protection paper;

(6) The evenly stirred gypsum slurry and the protective paper are lapped and glued to form a wet board;

(7) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board.
The preparation method according to 8 or 9, wherein in step (1), the zeolite is calcined at a temperature of 200°C to 400°C, the firing time is 1.5h to 3h, and the drying temperature is 45°C to 60°C;

Gypsum clinker specific surface area (2) obtained Optionally, the step of 3500cm 2 / g to 4000cm 2 / g.
The method for preparing high impurity ion content desulfurized gypsum gypsum plasterboard according to any one of claims 1 to 5, comprising:

(1) Weigh the zeolite used to prepare the plate core and desulfurized gypsum raw meal and mix them uniformly, and crush the material while drying to dehydrate the desulfurized gypsum raw meal to obtain a mixture of desulfurized gypsum clinker and zeolite;

(2) Grind the material obtained in step (1), increase the specific surface area of the material, and then cool the material to further stabilize the phase composition of the material;

(3) Weigh the glass fiber, stir it mechanically with the material obtained in step (2), and mix it evenly;

(4) Weigh water, retarder and starch and mix evenly to make mixed solution 1;

(5) Add the materials prepared in step (3) to the mixed solution 1 and mix uniformly to form a gypsum slurry;

(6) Pre-coating or spraying a mixture of starch aqueous solution and absorbent material on the face protection paper 2;

(7) The well-stirred gypsum slurry and the protective paper are lapped and glued to form a wet board;

(8) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board.
The production method according to claim 11, wherein the specific surface area of the step (2) in the clinker is finely ground gypsum 3500cm 2 / g to 4000cm 2 / g, the mass is cooled in the cooling temperature is 25 ℃ To 80°C.
The preparation method of high impurity ion content desulfurized gypsum gypsum board according to claim 6 or 7, comprising:

(1) Mix water and modified starch uniformly to prepare mixture 1;

(2) The natural zeolite used to prepare the plate core is roasted and modified at high temperature to obtain the modified natural zeolite;

(3) Mixing the desulfurized gypsum raw meal and the modified natural zeolite uniformly, and obtain a mixture of desulfurized gypsum clinker and modified natural zeolite after calcination;

(4) Mixing the mixture 1 obtained in step (1) with the mixture obtained in step (3) uniformly to prepare a gypsum slurry;

Optionally, (4') pre-spraying the mixed solution 2 of the aqueous solution of starch and the absorbent material on the facial protection paper;

(5) The gypsum slurry and the protective paper are lapped and glued to form a wet board;

(6) After the wet board is solidified, it enters the dryer, and the dried wet board is the gypsum board.
The preparation method according to claim 13, wherein the calcination temperature of the high-temperature calcination in step (2) is 200°C to 600°C, and the calcination time is 1h to 2h; and the calcination temperature in step (3) is 110°C. ℃ to 270℃, calcination time is 1h to 3h.
The preparation method according to any one of claims 8 to 14, wherein the weight ratio of water, starch and adsorbent in the mixture 2 of the aqueous starch solution and the adsorbent material is 100:(3 to 8):(1 to 5);

The amount of water in the mixed solution 2 does not exceed 5% of the weight of the desulfurized gypsum raw meal used to prepare the board core.
The preparation method according to any one of claims 8 to 15, wherein the drying of the wet board includes two or more drying stages with decreasing drying temperature;

Optionally, the drying of the wet board has three drying stages: the drying time of the first drying stage is 0.1h to 1h, and the drying temperature is 140°C to 200°C; the drying time of the second drying stage is 0.1h To 2h, the drying temperature is 80°C to 130°C; the drying temperature of the third drying stage is 40°C to 60°C, and the drying time is 12-36h or drying to constant weight.