CN114920535B - Paper-surface gypsum board and preparation method thereof - Google Patents
Paper-surface gypsum board and preparation method thereof Download PDFInfo
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- CN114920535B CN114920535B CN202210734708.4A CN202210734708A CN114920535B CN 114920535 B CN114920535 B CN 114920535B CN 202210734708 A CN202210734708 A CN 202210734708A CN 114920535 B CN114920535 B CN 114920535B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
- B28B19/0092—Machines or methods for applying the material to surfaces to form a permanent layer thereon to webs, sheets or the like, e.g. of paper, cardboard
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/02—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein a ram exerts pressure on the material in a moulding space; Ram heads of special form
- B28B3/025—Hot pressing, e.g. of ceramic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
- E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
- E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention belongs to the technical field of gypsum boards, and particularly relates to a paper-surface gypsum board and a preparation method thereof. The invention relates to a paper-surface gypsum board, which comprises the following components in parts by weight: 60-70 parts of desulfurized gypsum, 5-15 parts of basalt fiber, 1-5 parts of sepiolite fiber, 5-10 parts of modified starch, 3-7 parts of modified APAO emulsion, 0.1-0.5 part of composite foaming agent, 0.03-0.05 part of retarder, 0.1-0.5 part of water reducing agent, 50-75 parts of water and mask paper. The gypsum board prepared by the invention has the advantages of high strength, high toughness and water resistance, and no opening exists on the paper surface in the transportation process under the condition of long-time high temperature or low temperature (extreme temperature).
Description
Technical Field
The invention belongs to the technical field of gypsum boards, and particularly relates to a paper-surface gypsum board and a preparation method thereof.
Background
The gypsum board is a material prepared by taking building gypsum as a main raw material. The building material has the advantages of light weight, high strength, small thickness, convenient processing, sound insulation, heat insulation, fire prevention and other good performances, and is one of the currently-developed novel light boards. Gypsum boards produced in China mainly include gypsum boards: paper-surface gypsum board, paperless gypsum board, decorative gypsum board, gypsum hollow lath, fiber gypsum board, gypsum acoustic board, positioning point gypsum board and the like.
The paper-surface gypsum board is a light building board prepared in a production line by taking gypsum as a base material, mixing additives such as a binder, a foaming agent and the like as core materials and taking two layers of paper boards as protective paper. The existing paper-surface gypsum board is low in strength, and the board is easy to break in the transportation process, so that inconvenience is brought to construction. In addition, after the gypsum board is installed, serious quality problems such as falling off and cracking of gypsum materials can be caused under the action of external force such as vibration, impact and extrusion and in a humid environment, and the building appearance is influenced and certain hidden danger is caused to the safety of building decoration while the shape is damaged. In addition, the existing paper-surface gypsum board generally has the condition that the paper surface of the existing paper-surface gypsum board can not be opened, but the paper surface is opened under the condition of high temperature or low temperature (extreme temperature) for a long time in the transportation process.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a paper-surface gypsum board and a preparation method thereof. The gypsum board prepared by the invention has the advantages of high strength, high toughness and water resistance, and no opening exists on the paper surface in the transportation process under the condition of long-time high temperature or low temperature (extreme temperature).
In order to solve the technical problems, the invention specifically provides the following technical scheme.
The paper-surface gypsum board comprises the following components in parts by weight:
60-70 parts of desulfurized gypsum, 5-15 parts of basalt fiber, 1-5 parts of sepiolite fiber, 5-10 parts of modified starch, 3-7 parts of modified APAO emulsion, 0.1-0.5 part of composite foaming agent, 0.03-0.05 part of retarder, 0.1-0.5 part of water reducing agent, 50-75 parts of water and mask paper.
Furthermore, the desulfurized gypsum is 80-100 meshes.
Further, the preparation method of the modified starch comprises the following steps: grinding the starch to 1600-1800 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 20-40min to prepare starch paste with the starch content of 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, wherein the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1.
Further, the modified APAO emulsion is an APAO emulsion grafted with methyl methacrylate, and the solid content is between 40 and 60 percent.
Further, the composite foaming agent is sodium dodecyl sulfate, decyl glucoside and sodium oleoyl methyl taurate, and the mass ratio of the sodium dodecyl sulfate to the decyl glucoside is 2:1:1.
further, the retarder is one or a combination of sodium hexametaphosphate, sodium polyphosphate, citric acid, sodium citrate, tartaric acid and potassium tartrate.
Further, the water reducing agent is one or a combination of a plurality of polycarboxylic acid water reducing agent, benzene sulfonate water reducing agent, naphthalene water reducing agent and melamine water reducing agent.
The preparation method of the paper-surface gypsum board specifically comprises the following steps:
step 1, mechanically and uniformly mixing desulfurized gypsum, basalt fiber, sepiolite fiber and water to obtain a component A;
step 2, mechanically and uniformly mixing the modified starch and the modified APAO emulsion at 25-30 ℃ to obtain a component B;
step 3, mechanically mixing the components A and B, then ultrasonically dispersing, adding a composite foaming agent, a retarder and a water reducing agent, and mechanically and uniformly mixing to obtain a mixture;
and 4, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot-press forming at the temperature of 180-210 ℃ under the pressure of 20-25MPa, drying, cutting off, and trimming to obtain the gypsum board.
Further, the mechanical mixing is: the rotating speed is 300-800r/min, and the stirring time is 15-20min.
Furthermore, the ultrasonic dispersion frequency is 20-45KHz, the ultrasonic power is 0.8-1.0kw, and the ultrasonic dispersion time is 20-25min.
Further, the drying in step 4 is gradient decreasing drying.
Further, in the step 4, gradient decreasing drying is carried out for three drying stages, wherein the drying time of the first drying stage is 1-1.5h, and the drying temperature is 150-200 ℃; the drying time of the second drying stage is 3-5h, and the drying temperature is 100-140 ℃; the drying time of the third drying stage is 10-20h, and the drying temperature is 40-55 ℃.
Compared with the prior art, the invention has the beneficial effects that.
1. The gypsum board disclosed by the invention has the characteristics of solid waste utilization, greenness and environmental friendliness.
2. The invention grinds starch to 1600-1800 meshes, carries out chemical modification after ultrasonic dispersion, realizes physical and chemical simultaneous modification, not only enables the paper surface to be firmly bonded with the gypsum board, but also can further improve the strength and the toughness of the gypsum board.
3. After the gypsum, basalt fiber and sepiolite fiber are integrally formed into a composite framework, the modified APAO emulsion is added to play a role in crosslinking so that the composite framework forms a dense and complex three-dimensional network, and the strength and toughness of the gypsum board are further enhanced; the modified APAO emulsion itself is tacky, weatherable, low density, resistant to high and low temperatures, and when used with the modified starch, allows the gypsum board to be non-open to the paper surface at high and low temperatures, allowing the gypsum board to have a broader temperature range during shipping.
4. The sepiolite fibers can be expanded to block the pores after absorbing water, thereby playing a role in water prevention; the modified APAO emulsion can also play a role in water resistance as a water repellent.
5. The invention adopts the composite foaming agent, has high foaming times and uniform and stable foam, can improve the strength and toughness of the gypsum board and reduce the mass of the gypsum board in unit area.
Detailed Description
Some embodiments of the invention are disclosed below, and those skilled in the art can appropriately modify the process parameters to achieve the invention according to the disclosure herein. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
A preparation method of a high-strength, anti-cracking and high-toughness paper-surface gypsum board specifically comprises the following steps:
step 1, mechanically and uniformly mixing 60-70 parts of desulfurized gypsum with 80-100 meshes, 5-15 parts of basalt fiber, 1-5 parts of sepiolite fiber and 50-75 parts of water to obtain a component A, wherein the mechanical mixing speed is 300-800r/min, and the stirring time is 15-20min;
step 2, mechanically and uniformly mixing 5-10 parts of modified starch and 3-7 parts of APAO emulsion grafted with methyl methacrylate and having the solid content of 40-60% at 25-30 ℃, wherein the mechanical mixing rotating speed is 300-800r/min, and the stirring time is 15-20min, so as to obtain a component B;
step 3, mechanically mixing the components A and B at the rotating speed of 300-800r/min for 15-20min, then ultrasonically dispersing at the frequency of 20-45KHz and the ultrasonic power of 0.8-1.0kw for 20-25min, and then adding 0.1-0.5 part of composite foaming agent (sodium dodecyl sulfate, decyl glucoside and sodium oleoyl methyl taurate in a mass ratio of 2;
and 4, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot press forming at the temperature of 180-210 ℃ and under the pressure of 20-25MPa, and carrying out gradient decreasing drying, cutting and edge sawing to obtain the gypsum board.
Further, the preparation method of the modified starch comprises the following steps: grinding the starch to 1600-1800 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 20-40min to obtain starch paste with the starch content of 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, wherein the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1.
Further, the retarder is one or a combination of several of sodium hexametaphosphate, sodium polyphosphate, citric acid, sodium citrate, tartaric acid and potassium tartrate.
Further, the water reducing agent is one or a combination of a plurality of polycarboxylic acid water reducing agent, benzene sulfonate water reducing agent, naphthalene water reducing agent and melamine water reducing agent.
Further, the gradient decreasing drying in the step 4 has three drying stages, the drying time of the first drying stage is 1-1.5h, and the drying temperature is 150-200 ℃; the drying time of the second drying stage is 3-5h, and the drying temperature is 100-140 ℃; the drying time of the third drying stage is 10-20h, and the drying temperature is 40-55 ℃.
Example 1.
A preparation method of a paper-surface gypsum board specifically comprises the following steps:
step 1, mechanically and uniformly mixing 70 parts of 80-mesh desulfurized gypsum, 15 parts of basalt fiber, 5 parts of sepiolite fiber and 75 parts of water to obtain a component A, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min.
Step 2, preparing modified starch: grinding starch to 1800 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 40min to prepare starch paste with the starch content of 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, wherein the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1.
And 3, mechanically and uniformly mixing 5 parts of modified starch and 7 parts of APAO emulsion grafted with methyl methacrylate and having the solid content of 55% at 30 ℃, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min, so as to obtain the component B.
And 4, mechanically mixing the components A and B at the rotating speed of 300r/min for 20min, then ultrasonically dispersing at the frequency of 20KHz and the ultrasonic power of 1.0kw for 25min, then adding 0.5 part of a composite foaming agent (sodium dodecyl sulfate, decyl glucoside, sodium oleoyl methyl taurate in a mass ratio of 2.
Step 5, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot press forming at the temperature of 210 ℃ and under the pressure of 23MPa, and carrying out gradient degressive drying, cutting off and edge sawing to obtain the gypsum board; the gradient decreasing drying is as follows: the drying time of the first drying stage is 1h, and the drying temperature is 200 ℃; the drying time of the second drying stage is 3h, and the drying temperature is 100 ℃; the drying time of the third drying stage was 16h, and the drying temperature was 50 ℃.
Example 2.
A preparation method of a paper-surface gypsum board specifically comprises the following steps:
step 1, mechanically and uniformly mixing 80-mesh 65 parts of desulfurized gypsum, 15 parts of basalt fiber, 4 parts of sepiolite fiber and 70 parts of water to obtain a component A, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min.
Step 2, preparing modified starch: grinding starch to 1800 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 40min to prepare starch paste, wherein the starch content is 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1.
And step 3, mechanically and uniformly mixing 8 parts of modified starch and 5 parts of APAO emulsion grafted with methyl methacrylate and having the solid content of 55% at the temperature of 30 ℃, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min, so as to obtain the component B.
And 4, mechanically mixing the components A and B at the rotating speed of 300r/min for 20min, then ultrasonically dispersing at the frequency of 20KHz and the ultrasonic power of 1.0kw for 25min, and then adding 0.4 part of a composite foaming agent (sodium dodecyl sulfate, decyl glucoside, sodium oleoyl methyl taurate in a mass ratio of 2.
Step 5, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot press forming at the temperature of 210 ℃ and under the pressure of 23MPa, and carrying out gradient degressive drying, cutting off and edge sawing to obtain the gypsum board; the gradient decreasing drying is as follows: the drying time of the first drying stage is 1h, and the drying temperature is 200 ℃; the drying time of the second drying stage is 3h, and the drying temperature is 100 ℃; the drying time of the third drying stage was 16h and the drying temperature was 50 ℃.
Example 3.
A preparation method of a paper-surface gypsum board specifically comprises the following steps:
step 1, mechanically and uniformly mixing 60 parts of desulfurized gypsum with 80 meshes, 15 parts of basalt fiber, 4 parts of sepiolite fiber and 70 parts of water to obtain a component A, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min.
Step 2, preparing modified starch: grinding starch to 1800 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 40min to prepare starch paste with the starch content of 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, wherein the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1.
And 3, mechanically and uniformly mixing 10 parts of modified starch and 3 parts of APAO emulsion grafted with methyl methacrylate and having the solid content of 55% at 30 ℃, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min, so as to obtain the component B.
And 4, mechanically mixing the components A and B at the rotating speed of 300r/min for 20min, performing ultrasonic dispersion at the frequency of 20KHz and the ultrasonic power of 1.0kw for 25min, and adding 0.2 part of a composite foaming agent (sodium dodecyl sulfate, decyl glucoside, sodium oleoyl methyl taurate in a mass ratio of 2.
Step 5, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot press forming at the temperature of 210 ℃ and under the pressure of 23MPa, and carrying out gradient degressive drying, cutting off and edge sawing to obtain the gypsum board; the gradient decreasing drying is as follows: the drying time of the first drying stage is 1h, and the drying temperature is 200 ℃; the drying time of the second drying stage is 3h, and the drying temperature is 100 ℃; the drying time of the third drying stage was 16h, and the drying temperature was 50 ℃.
Comparative example 1.
A preparation method of a paper-surface gypsum board specifically comprises the following steps:
step 1, mechanically and uniformly mixing 80-mesh 65 parts of desulfurized gypsum, 15 parts of basalt fiber, 4 parts of sepiolite fiber and 70 parts of water to obtain a component A, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min.
Step 2, preparing modified starch: grinding starch to 1000 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 40min to prepare starch paste, wherein the starch content is 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1.
And 3, mechanically and uniformly mixing 8 parts of modified starch and 5 parts of APAO emulsion grafted with methyl methacrylate and having the solid content of 55% at 30 ℃, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min, so as to obtain the component B.
And 4, mechanically mixing the components A and B at the rotating speed of 300r/min for 20min, then ultrasonically dispersing at the frequency of 20KHz and the ultrasonic power of 1.0kw for 25min, and then adding 0.4 part of a composite foaming agent (sodium dodecyl sulfate, decyl glucoside, sodium oleoyl methyl taurate in a mass ratio of 2.
Step 5, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot press forming at the temperature of 210 ℃ and under the pressure of 23MPa, and carrying out gradient degressive drying, cutting off and edge sawing to obtain the gypsum board; the gradient decreasing drying is as follows: the drying time of the first drying stage is 1h, and the drying temperature is 200 ℃; the drying time of the second drying stage is 3h, and the drying temperature is 100 ℃; the drying time of the third drying stage was 16h and the drying temperature was 50 ℃.
Comparative example 2.
A preparation method of a paper-surface gypsum board specifically comprises the following steps:
step 1, mechanically and uniformly mixing 65 parts of 80-mesh desulfurized gypsum, 15 parts of basalt fiber, 4 parts of sepiolite fiber and 70 parts of water to obtain a component A, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min.
Step 2, preparing modified starch: grinding starch to 1800 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 40min to prepare starch paste with the starch content of 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, wherein the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1.
And 3, mechanically stirring 8 parts of modified starch at 30 ℃, wherein the mechanical stirring speed is 300r/min, and the stirring time is 20min, so as to obtain the component B.
And 4, mechanically mixing the components A and B at the rotating speed of 300r/min for 20min, then ultrasonically dispersing at the frequency of 20KHz and the ultrasonic power of 1.0kw for 25min, and then adding 0.4 part of a composite foaming agent (sodium dodecyl sulfate, decyl glucoside, sodium oleoyl methyl taurate in a mass ratio of 2.
Step 5, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot press forming at the temperature of 210 ℃ and under the pressure of 23MPa, and carrying out gradient degressive drying, cutting off and edge sawing to obtain the gypsum board; the gradient decreasing drying is as follows: the drying time of the first drying stage is 1h, and the drying temperature is 200 ℃; the drying time of the second drying stage is 3h, and the drying temperature is 100 ℃; the drying time of the third drying stage was 16h, and the drying temperature was 50 ℃.
Comparative example 3.
The preparation method of the paper-surface gypsum board specifically comprises the following steps:
step 1, mechanically and uniformly mixing 65 parts of 80-mesh desulfurized gypsum, 15 parts of basalt fiber, 4 parts of sepiolite fiber and 70 parts of water to obtain a component A, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min.
Step 2, preparing modified starch: grinding starch to 1800 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 40min to prepare starch paste with the starch content of 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, wherein the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1.
And step 3, mechanically and uniformly mixing 8 parts of modified starch and 5 parts of APAO emulsion grafted with methyl methacrylate and having the solid content of 55% at the temperature of 30 ℃, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min, so as to obtain the component B.
And 4, mechanically mixing the components A and B at the rotating speed of 300r/min for 20min, then ultrasonically dispersing at the frequency of 20KHz and the ultrasonic power of 1.0kw for 25min, and then adding 0.4 part of sodium dodecyl sulfate, 0.04 part of sodium hexametaphosphate and 0.3 part of polycarboxylic acid water reducer, and mechanically and uniformly mixing to obtain a mixture.
Step 5, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot press forming at the temperature of 210 ℃ and under the pressure of 23MPa, and carrying out gradient degressive drying, cutting off and edge sawing to obtain a gypsum board; the gradient decreasing drying is as follows: the drying time of the first drying stage is 1h, and the drying temperature is 200 ℃; the drying time of the second drying stage is 3h, and the drying temperature is 100 ℃; the drying time of the third drying stage was 16h and the drying temperature was 50 ℃.
Comparative example 4.
The preparation method of the paper-surface gypsum board specifically comprises the following steps:
step 1, preparing modified starch: grinding starch to 1800 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 40min to prepare starch paste with the starch content of 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, wherein the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1.
Step 2, mechanically and uniformly mixing 65 parts of 80-mesh desulfurized gypsum, 15 parts of basalt fiber, 4 parts of sepiolite fiber, 8 parts of modified starch, 5 parts of APAO emulsion with solid content of 55% and methyl methacrylate grafted, and 70 parts of water, wherein the mechanical mixing speed is 300r/min, and the stirring time is 20min; and then carrying out ultrasonic dispersion, wherein the frequency is 20KHz, the ultrasonic power is 1.0kw, and the ultrasonic dispersion time is 25min, and then adding 0.4 parts of a composite foaming agent (sodium dodecyl sulfate, decyl glucoside, and oleoyl methyl taurate in a mass ratio of 2.
Step 3, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot press forming at the temperature of 210 ℃ and under the pressure of 23MPa, and carrying out gradient degressive drying, cutting off and edge sawing to obtain a gypsum plate; the gradient decreasing drying is as follows: the drying time of the first drying stage is 1h, and the drying temperature is 200 ℃; the drying time of the second drying stage is 3h, and the drying temperature is 100 ℃; the drying time of the third drying stage was 16h and the drying temperature was 50 ℃.
And (5) detecting the performance.
For the high-low temperature performance test of the gypsum board, a special high-low temperature detection box for the gypsum board is adopted to simulate the ten-day transportation condition and detect the opening condition of the paper surface.
Table 1 table of performance results for examples and comparative examples.
Claims (6)
1. The paper-surface gypsum board is characterized by comprising the following components in parts by weight:
60-70 parts of desulfurized gypsum, 5-15 parts of basalt fiber, 1-5 parts of sepiolite fiber, 5-10 parts of modified starch, 3-7 parts of modified APAO emulsion, 0.1-0.5 part of composite foaming agent, 0.03-0.05 part of retarder, 0.1-0.5 part of water reducing agent, 50-75 parts of water and mask paper;
the preparation method of the modified starch comprises the following steps: grinding starch to 1600-1800 meshes, mixing the ground starch with water, performing ultrasonic dispersion for 20-40min to obtain starch paste with the starch content of 40%, adding 20% hydrochloric acid aqueous solution into the starch paste, wherein the weight ratio of the starch paste to the hydrochloric acid aqueous solution is 1;
the modified APAO emulsion is APAO emulsion grafted with methyl methacrylate, and the solid content is between 40 and 60 percent;
the composite foaming agent is sodium dodecyl sulfate, decyl glucoside and oleoyl methyl sodium taurate, and the mass ratio is 2:1:1;
the preparation method of the paper-surface gypsum board specifically comprises the following steps:
step 1, mechanically and uniformly mixing desulfurized gypsum, basalt fiber, sepiolite fiber and water to obtain a component A;
step 2, mechanically and uniformly mixing the modified starch and the modified APAO emulsion at 25-30 ℃ to obtain a component B;
step 3, mechanically mixing the components A and B, then ultrasonically dispersing, adding the composite foaming agent, the retarder and the water reducing agent, and mechanically and uniformly mixing to obtain a mixture;
and 4, pouring the mixture into a flat plate forming machine pressed with a protective paper, attaching a layer of protective paper on the surface, carrying out hot press forming at the temperature of 180-210 ℃ and under the pressure of 20-25MPa, drying, cutting, and trimming to obtain the gypsum board.
2. A gypsum plaster board according to claim 1, wherein the desulfurized gypsum is 80-100 mesh desulfurized gypsum.
3. A gypsum plaster board according to claim 1, wherein the retarder is one or a combination of sodium hexametaphosphate, sodium polyphosphate, citric acid, sodium citrate, tartaric acid and potassium tartrate.
4. The gypsum plaster board of claim 1, wherein the water reducing agent is one or more of a polycarboxylate water reducing agent, a benzene sulfonate water reducing agent, a naphthalene water reducing agent, and a melamine water reducing agent.
5. A paper-faced gypsum board according to claim 1, wherein the mechanical mixing is: the rotating speed is 300-800r/min, and the stirring time is 15-20min; the ultrasonic dispersion frequency is 20-45KHz, the ultrasonic power is 0.8-1.0kw, and the ultrasonic dispersion time is 20-25min.
6. A gypsum plasterboard according to claim 1, wherein the drying in step 4 is a gradient decreasing drying, comprising three drying stages, the first drying stage having a drying time of 1-1.5h and a drying temperature of 150-200 ℃; the drying time of the second drying stage is 3-5h, and the drying temperature is 100-140 ℃; the drying time of the third drying stage is 10-20h, and the drying temperature is 40-55 ℃.
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| AU2596101A (en) * | 1999-12-23 | 2001-07-03 | Joseph S. Luongo | Strengthened, light weight construction board and method and apparatus for making the same |
| CN108675741A (en) * | 2018-05-30 | 2018-10-19 | 王雪峰 | A kind of preparation method of refractory plasterboard |
| CN110386803A (en) * | 2018-04-20 | 2019-10-29 | 阜新泰山石膏建材有限公司 | A kind of preparation method of plasterboard |
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| DE2718322A1 (en) * | 1977-04-25 | 1978-10-26 | Hoechst Ag | PLASTER BOARD |
| JPH1112018A (en) * | 1997-06-17 | 1999-01-19 | Sekisui Chem Co Ltd | Wood cement composition and production of wood cement board by using the composition |
| AT505928B1 (en) * | 2007-11-20 | 2009-05-15 | Tulln Zuckerforschung Gmbh | BUILDING MATERIAL COMPOSITION |
| CN101935410B (en) * | 2010-05-27 | 2012-04-11 | 四川省蓬溪县弘桥实业有限公司 | Production technology of plasterboard modified starch |
| CN107090201B (en) * | 2017-06-07 | 2019-08-09 | 湖北工业大学 | A kind of preparation method of putty paste |
| CN109181577A (en) * | 2018-09-25 | 2019-01-11 | 安溪县斯马拓科技发展有限公司 | A kind of mongolicum Turcz. with Modified Starch Adhesive preparation process |
| CN111138152B (en) * | 2020-01-03 | 2022-02-22 | 肇庆北新建材有限公司 | Waterproof gypsum board core, preparation method thereof and waterproof gypsum board |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2596101A (en) * | 1999-12-23 | 2001-07-03 | Joseph S. Luongo | Strengthened, light weight construction board and method and apparatus for making the same |
| CN110386803A (en) * | 2018-04-20 | 2019-10-29 | 阜新泰山石膏建材有限公司 | A kind of preparation method of plasterboard |
| CN108675741A (en) * | 2018-05-30 | 2018-10-19 | 王雪峰 | A kind of preparation method of refractory plasterboard |
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