WO2022000949A1

WO2022000949A1 - Paper faced gypsum board and preparation method therefor

Info

Publication number: WO2022000949A1
Application number: PCT/CN2020/130181
Authority: WO
Inventors: 尹东杰; 谭丹君; 王鹏起; 武发德
Original assignee: 北新集团建材股份有限公司
Priority date: 2020-06-28
Filing date: 2020-11-19
Publication date: 2022-01-06
Also published as: CN111807801B; CN111807801A

Abstract

A paper faced gypsum board, comprising a board core and a surface-protecting paper, the board core comprising the following raw materials in parts by weight: 100 parts raw gypsum, 0.05 to 0.2 parts glass fiber, 65 to 85 parts water, 0.2 to 1 part retarder, 0.1 to 0.5 parts foaming agent, 0.2 to 2 parts starch, and 0.02 to 0.5 parts sodium alginate. Starch is a commonly used binder for paper faced gypsum board, and is typically added to and mixed with a gypsum slurry. The evaporation of excess free water in the board core during the board drying process allows the starch to move to the critical interface between the board core and a surface-protecting paper, forming a pasty film layer that adheres the surface-protecting paper to the board core. The various components of the paper faced gypsum board create a synergistic effect, promoting the bonding of the gypsum board core to the surface-protecting paper. Even under harsh testing conditions, the surface-protecting paper is unable to be stripped away from the board core, the bonding effect is strong, and the mechanical properties of the board are excellent.

Description

A kind of gypsum board and preparation method thereof

technical field

The present application relates to but not limited to the field of building materials, particularly but not limited to a gypsum board and a preparation method thereof.

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, China's annual output of desulfurized gypsum is astonishing. Desulfurized gypsum is widely used in building materials and other industries, which promotes the further development of China'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.

Starch is a commonly used binder for gypsum boards. It is usually added with gypsum slurry. During the drying process of the board, it migrates to the critical surface between the board core and the cover paper with the evaporation of excess free water in the board core, forming a layer of paste. The protective film is glued to the core of the board.

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 this application.

The present application provides a paper-faced gypsum board and a preparation method thereof. The present application promotes the bonding between the gypsum board core and the cover paper through the synergistic action of each component. Under the harsh test conditions, the core and the protective paper do not peel off, the bonding effect is good, and the mechanical properties of the board are excellent.

The application provides a paper-faced gypsum board, and the board core raw materials include, in parts by weight: 100 parts of gypsum clinker, 0.05 to 0.2 parts of glass fiber, 65 to 85 parts of water, and 0.2 to 1 part of retarder part, 0.1 part to 0.5 part of foaming agent, 0.2 part to 2 part of starch, 0.02 part to 0.5 part of sodium alginate.

In an embodiment of the present application, the raw material of the gypsum board may be composed of gypsum clinker, glass fiber, water, setting retarder, foaming agent, starch and sodium alginate.

In the process of preparing the board core, sodium alginate is first mixed with water uniformly, and then mixed with other board core raw materials to prepare gypsum board.

In one embodiment of the present application, the specific surface area of the gypsum clinker 3500cm ² / g to 4000cm ² / g;

In an embodiment of the present application, the chloride ion content in the gypsum clinker does not exceed 300 ppm.

In one embodiment of the present application, the starch is selected from any one or more of modified potato starch, modified tapioca starch and modified corn starch, and may be modified corn starch.

In an embodiment of the present application, the glass fiber is selected from any one or more of medium-alkali glass fiber, alkali-free glass fiber and alkali-resistant glass fiber.

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

In an embodiment of the present application, the retarder is selected from any one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax and protein retarders.

In one embodiment of the present application, the retarder is selected from any one or more of protein-based retarders, and the protein-based retarder includes bone glue protein retarder and degraded polyamide Calcium salted protein gypsum retarder.

In one embodiment of the present application, the foaming agent is selected from any one or more of ammonium lauryl sulfate, sodium bicarbonate and ammonium bicarbonate.

In another aspect, the application provides the above-mentioned preparation method of gypsum board, comprising:

Step 1. Mix the gypsum clinker and the glass fiber, stir evenly, and make a mixture;

Step 2, mix the water and the sodium alginate, stir evenly, and make a viscous liquid; mix the viscous liquid with the foaming agent, the retarder, and the starch, Stir to make a uniform mixture;

Step 3, mixing the mixture prepared in step 2 with the mixture prepared in step 1 and stirring evenly to make gypsum slurry;

Step 4: The gypsum slurry prepared in step 3 is poured on the protective paper, and the gypsum board is formed by lap bonding and forming, and dried to constant weight.

In an embodiment of the present application, the gypsum slurry is thrown onto the cover paper under the action of centrifugal force, and then squeezed by a forming knife. The other protective paper is overlapped and adhered to form a wet plate, and then the wet plate is drawn out to complete the forming;

In one embodiment of the present application, the formed wet plate is solidified, and after being cut, it enters a dryer and undergoes three drying stages of 180°C to 155°C, 100°C to 130°C, and 45°C to 60°C;

In an embodiment provided in this application, the dried boards are laminated, sawed, edge-sealed, and packaged to form a gypsum board.

In another aspect, the present application provides the application of sodium alginate in gypsum board to promote the bonding between the board core and the cover paper. The bonding performance between the cover paper and the board core mainly comes from the binder, and sodium alginate needs to be used together with the binder to promote the bonding between the board core and the cover paper.

In an embodiment provided in this application, the binder may be starch.

Other features and advantages of the present application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the present application. Other advantages of the present application may be realized and obtained by the inventions described in the specification.

detail

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

The embodiments of the present application provide a paper-faced gypsum board, and the board core raw materials include, in parts by weight: 100 parts of gypsum clinker, 0.05 to 0.2 parts of glass fibers, 65 to 85 parts of water, and 0.2 parts of retarder. part to 1 part, 0.1 part to 0.5 part of foaming agent, 0.2 part to 2 part of starch, 0.02 part to 0.5 part of sodium alginate.

The raw material of the gypsum board can be composed of gypsum clinker, glass fiber, water, retarder, foaming agent, starch and sodium alginate.

In the embodiment of the present application, the specific surface area of the gypsum clinker 3500cm ² / g to 4000cm ² / g;

In the examples of the present application, the chloride ion content in the gypsum clinker does not exceed 300 ppm.

In the embodiments of the present application, the starch is selected from any one or more of modified potato starch, modified tapioca starch and modified corn starch, and may be modified corn starch.

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

In the examples of the present application, the length of the glass fiber is 9 mm to 15 mm, and the diameter of the single filament of the glass fiber is 10 μm to 15 μm.

In the embodiments of the present application, the retarder is selected from any one or more of citric acid, sodium citrate, sodium hexametaphosphate, borax and protein retarders.

In the embodiments of the present application, the retarder is selected from any one or more of protein-based retarders, and the protein-based retarders include bone glue protein retarders and degraded polyamides that are calcium salted The protein-based gypsum retarder.

In the embodiments of the present application, the foaming agent is selected from any one or more of ammonium dodecyl sulfate, sodium bicarbonate and ammonium bicarbonate.

On the other hand, in the examples of the present application, sodium alginate is first mixed with water uniformly, and then mixed with other board core raw materials to prepare gypsum board. The preparation method of above-mentioned gypsum board, comprising:

In the embodiment of the present application, the gypsum slurry is thrown onto the protective paper under the action of centrifugal force, and then squeezed by a forming knife. The tissue paper is overlapped and adhered to form a wet plate, and then the wet plate is drawn out to complete the forming;

In the embodiment of the present application, the formed wet plate is solidified, and after being cut, it enters the dryer, and goes through three drying stages of 180°C to 155°C, 100°C to 130°C, and 45°C to 60°C;

In the embodiments of the present application, the dried boards are laminated, sawed, edge-sealed, and packaged to form a gypsum board.

In the following examples, the clinker gypsum used is commonly available products, the chloride ion content ≤300ppm; gypsum clinker surface area 3500cm ² / g to 4000cm ² / g, a water content in the crystal than 5.0 wt% to 5.5 wt%, initial setting time 1' to 1'30", final setting 3'30" to 5'. Where ' means minutes and '' means seconds.

The glass fiber was purchased from Hebeijing Hang Mineral Products Co., Ltd., the alkali-free glass fiber, medium-alkali glass fiber and alkali-resistant glass fiber have a fiber length of 10 mm and a fiber monofilament diameter of 10 μm;

Foaming agents sodium bicarbonate, ammonium lauryl sulfate and ammonium bicarbonate were purchased from Jinan Yihao Chemical Co., Ltd.;

Modified corn starch was purchased from Jinan Yuantong Chemical Co., Ltd.; modified potato starch and modified tapioca starch were purchased from Guangzhou Jianke Biotechnology Co., Ltd.;

The protein-based gypsum retarder obtained by degrading polyamide with calcium salt by the retarder is Italian SICIT 2000 gypsum retarder Plast Retard PE, purchased from Shanghai Qinhe Chemical Co., Ltd.

Retarder: citric acid, sodium citrate, sodium hexametaphosphate, borax, purchased from Sinopharm Chemical Reagent Co., Ltd.; brand: Wokai.

Sodium alginate (analytical grade) was purchased from Sinopharm Group Chemical Reagent Co., Ltd.; brand: Shanghai Test.

Example 1

To prepare gypsum board, the steps are as follows:

Step 1: Weigh 100 parts by weight of desulfurized gypsum clinker, 0.08 parts by weight of medium-alkali glass fiber, 68 parts by weight of water, 0.3 parts by weight of retarder Plast Retard PE, 0.18 parts by weight of foaming agent sodium bicarbonate, modified corn 0.8 part by weight of starch and 0.05 part by weight of sodium alginate.

Step 2, mixing the desulfurized gypsum clinker and glass fiber uniformly;

Step 3: Mix the water and sodium alginate, stir evenly, and make a viscous liquid. Then add foaming agent, retarder, starch and mix, and stir to make a uniform mixture;

Step 4, adding the mixture obtained in step 2 to the mixed solution of step 3 to make gypsum slurry;

Step 5. Throw the evenly stirred gypsum slurry onto the cover paper under the action of centrifugal force, and then extrude it with a forming knife. After the cover paper is folded into a right angle, it is squeezed by the forming plate with another cover paper. Lap and stick together to form a wet plate, and then the wet plate is drawn out to complete the forming;

Step 6. The formed wet plate is solidified, and after being cut, it enters the dryer, and goes through three drying stages at 160°C for 0.5 hour; 110°C for 1 hour; and 45°C for 24 hours;

Step 7. The dried boards are laminated, sawed, edge-sealed, and packaged to form a gypsum board.

Example 2

To prepare gypsum board, the steps are as follows:

Step 1: Weigh 100 parts by weight of desulfurized gypsum clinker, 0.2 parts by weight of alkali-free glass fibers, 75 parts by weight of water, 0.6 parts by weight of citric acid, 0.3 parts by weight of ammonium lauryl sulfate, 0.6 parts by weight of modified corn starch, 0.3 parts by weight of sodium alginate.

Step 2 to Step 7 are the same as in Example 1

Example 3

To prepare gypsum board, the steps are as follows:

Step 1. Weigh 100 parts by weight of desulfurized gypsum clinker, 0.1 part by weight of alkali-resistant glass fiber, 78 parts by weight of water, 0.8 part by weight of sodium citrate, 0.2 part by weight of ammonium bicarbonate, 1.2 part by weight of modified tapioca starch, and alginic acid. Sodium 0.28 parts by weight.

Step 2 to Step 7 are the same as in Example 1.

Example 4

To prepare gypsum board, the steps are as follows:

Step 1: Weigh 100 parts by weight of desulfurized gypsum clinker, 0.2 parts by weight of medium-alkali glass fiber, 80 parts by weight of water, 0.5 parts by weight of sodium hexametaphosphate, 0.4 parts by weight of sodium bicarbonate, 0.6 parts by weight of modified potato starch, and algae. Sodium 0.4 parts by weight.

Step 2 to Step 7 are the same as in Example 1.

Example 5

To prepare gypsum board, the steps are as follows:

Step 1: Weigh 100 parts by weight of desulfurized gypsum clinker, 0.06 parts by weight of alkali-free glass fibers, 82 parts by weight of water, 0.4 parts by weight of borax, 0.3 parts by weight of ammonium lauryl sulfate, 1.5 parts by weight of modified tapioca starch, and seaweed. Sodium 0.3 parts by weight.

Step 2 to Step 7 are the same as in Example 1.

Comparative Example 1

Sodium alginate was not added in the preparation process of the gypsum board, and the proportions of other raw materials and the preparation steps were the same as those in Example 1.

Comparative Example 2

Sodium alginate was not added in the preparation process of the gypsum board, and the proportions and preparation steps of other raw materials were the same as those in Example 2.

Comparative Example 3

Commercially available gypsum board without sodium alginate.

Comparative Example 4

No starch was added in the preparation process of the gypsum board, and the proportions and preparation steps of other raw materials were the same as those in Example 1.

Comparative Example 5

To prepare gypsum board, the steps are as follows:

Step 1. Weigh the raw materials in the same dosage and proportion of Example 1.

Step 2, mixing the desulfurized gypsum clinker, sodium alginate, foaming agent sodium bicarbonate, protein retarder, starch and glass fiber uniformly;

Step 3, adding water to the mixture obtained in step 2 to make gypsum slurry;

Step 4: Throw the evenly stirred gypsum slurry onto the cover paper under the action of centrifugal force, and then extrude it with a forming knife. Lap and stick together to form a wet plate, and then the wet plate is drawn out to complete the forming;

Step 5. The formed wet plate is solidified, and after being cut, it enters the dryer, and goes through three drying stages at 160°C for 0.5 hour; 110°C for 1 hour; and 45°C for 24 hours;

Step 6: The dried boards are combined, sawed, edge-sealed, and packaged to form a gypsum board.

Test Example 1

The bonding performance is divided into 5 grades, A grade: the cardboard is firmly bonded and does not separate after lifting; B grade: a small part is separated, most of it is intact; C grade: half stick, half separate; D grade: mostly separated, only A small part is firmly adhered; Class E: The cardboard is completely separated.

With reference to the Chinese national standard GB/T9775-2008 "paper-faced gypsum board", the paper-faced gypsum board of the embodiment and the comparative example is tested, and the paper-faced gypsum board thickness is 9.5mm, and the dry bonding performance of the paper-faced gypsum board is detected.

The test method for wet-heat bonding performance is as follows: the prepared gypsum board is placed in a water bath at 100 ° C for hot steam curing for 12 minutes, and the bonding performance of the gypsum board is tested by the method of drawing an equilateral triangle. Tested in minutes.

High-humidity environment test: The prepared gypsum board is maintained under high-humidity conditions (temperature is (23±2)°C, relative humidity is 90±3), and after reaching the specified age for 1 week, the equilateral triangle is used. Methods To test the adhesive properties of gypsum board.

Table 1 Test results of bonding performance of gypsum board

	干粘结dry bonding	湿热粘结Moisture and 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	AA	AA
实施例4Example 4	AA	AA	AA
实施例5Example 5	AA	AA	AA
对比例1Comparative Example 1	AA	EE	EE
对比例2Comparative Example 2	AA	EE	EE
对比例3Comparative Example 3	AA	EE	EE
对比例4Comparative Example 4	AA	EE	EE
对比例5Comparative Example 5	AA	DD	DD

It can be seen from Table 1 that the gypsum boards prepared in the examples of the present application have excellent bonding properties.

Test case 2

Referring to the Chinese national standard GB/T9775-2008 "Gypsum Board", the test conditions for the gypsum boards of the examples and comparative examples are: temperature (25±5)℃, relative humidity (50±5)% experiment Environmental conditions, the physical and mechanical properties of the gypsum board were tested, and the thickness of the gypsum board was 9.5 mm. The results are shown in Table 2.

Table 2 Performance test results of gypsum board

As can be seen from Table 2, the gypsum boards prepared in Examples 1, 2, 3, 4, and 5 of the present application can meet the Chinese national standards, and the physical and mechanical properties of Examples 1 and 2 are higher than those of Comparative Examples 1 and 2, respectively. 2 Prepared gypsum board. It shows that the addition of sodium alginate improves the mechanical properties of the plate to a certain extent.

This disclosure is an illustration of the principles of this application's embodiments, and is not intended to limit the application in any form or substance, or to limit the application to specific embodiments. For 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, altered, and evolved without departing from the above-mentioned embodiments and technical solutions of the present application. , the principle, spirit and scope as defined in the claims. These variations, changes, modifications, and variant embodiments 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. While the embodiments of the present application may be embodied in many different forms, some embodiments of the present application are described in detail herein. Furthermore, the examples of the present application include any possible combination of some or all of the various embodiments described herein, and are also included within the scope of the present application as 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 material are hereby incorporated by reference in their entirety.

The above disclosure is intended to be illustrative and not exhaustive. This description will suggest many variations and alternatives to those skilled in the art. All such alternatives and variations are intended to be included within the scope of the present claims, wherein the term "including" means "including, but not limited to".

This completes the description of alternative embodiments of the present application. Those skilled in the art may recognize other equivalents to the embodiments described herein, which equivalents are also encompassed by the claims appended hereto.

Claims

A paper-faced gypsum board, the paper-faced gypsum board includes a board core and a cover paper, and the board core raw materials include, in parts by weight: 100 parts of gypsum clinker, 0.05 to 0.2 parts of glass fiber, and 65 to 0.2 parts of water. 85 parts, 0.2 to 1 part of retarder, 0.1 to 0.5 part of foaming agent, 0.2 to 2 parts of starch, and 0.02 to 0.5 part of sodium alginate.
The gypsum board according to claim 1, wherein, in the process of preparing the board core, sodium alginate is first mixed with water uniformly, and then mixed with other board core raw materials to prepare the gypsum board.
The plaster board as claimed in claim 1 or claim 2 wherein the specific surface area of the gypsum clinker 3500cm 2 / g to 4000cm 2 / g.
The paper-faced gypsum board according to claim 1 or 2, wherein the chloride ion content in the gypsum clinker does not exceed 300 ppm.
The gypsum board according to claim 1 or 2, wherein the starch is selected from any one or more of modified potato starch, modified tapioca starch and modified corn starch, and can be modified corn starch.
The gypsum board according to claim 1 or 2, 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.
The gypsum board according to claim 6, wherein the length of the glass fibers is 9 mm to 15 mm, and the monofilament diameter of the glass fibers is 10 μm to 15 μm.
The gypsum board according to any one of claims 1 to 6, wherein the retarder is selected from any one of citric acid, sodium citrate, sodium hexametaphosphate, borax and protein retarders species or more.
The gypsum board according to claim 8, wherein the retarder is selected from any one or more of protein retarders, and the protein retarder includes a bone glue protein retarder It is a protein-based gypsum retarder made of calcium salted and degraded polyamide.
The gypsum board according to any one of claims 1 to 6, wherein the foaming agent is selected from any one or more of ammonium lauryl sulfate, sodium bicarbonate and ammonium bicarbonate .
A preparation method of the paper-faced gypsum board according to any one of claims 1 to 10, comprising:

1) mixing the gypsum clinker and the glass fiber, stirring evenly, to prepare a mixture;

2) Mix the water and the sodium alginate, stir evenly, and make a viscous liquid; Mix the viscous liquid with the foaming agent, the retarder, and the starch, and stir Make a homogeneous mixture;

3) mixing and stirring the mixed solution prepared in 2) with the mixture prepared in step 1 to make gypsum slurry;

4) The gypsum slurry prepared in 3) is poured on the protective paper, lapped and bonded firmly to form a gypsum board, and dried to constant weight.
Application of sodium alginate in gypsum board to promote the bonding of core and cover paper.