阅读说明：本技术 一种高强耐火纸面石膏板及其制备方法 (High-strength fire-resistant paper-surface gypsum board and preparation method thereof ) 是由 张晓菲 陈红霞 周全光 葛俊巧 冉秀云 于 2019-06-21 设计创作，主要内容包括：本发明提供了一种高强耐火纸面石膏板及其制备方法,纸面石膏板原料按质量份计包括：100份石膏熟料、0.1-0.3份减水剂、0.2-0.8份改性淀粉、0.03-0.05份发泡剂、1.5-3.5份耐火材料以及70-80份水。所述制备方法包括,称取各原料与水混合加入搅拌机混合均匀,得到石膏浆料；将搅拌均匀的石膏浆料与护面纸搭接粘牢成型,制得湿板；待湿板凝固后,进入干燥机,经过干燥后的湿板即为纸面石膏板。所述纸面石膏板通过改进纸面石膏板板芯的性能,从而得到强度更高并且耐火性能好的石膏板。(The invention provides a high-strength fire-resistant paper-surface gypsum board and a preparation method thereof, wherein the paper-surface gypsum board comprises the following raw materials in parts by mass: 100 parts of gypsum clinker, 0.1-0.3 part of water reducing agent, 0.2-0.8 part of modified starch, 0.03-0.05 part of foaming agent, 1.5-3.5 parts of refractory material and 70-80 parts of water. The preparation method comprises weighing the raw materials, mixing with water, adding into a stirrer, and mixing to obtain gypsum slurry; lapping and firmly adhering the uniformly stirred gypsum slurry and the protective paper for forming to prepare a wet plate; and (4) after the wet board is solidified, the wet board enters a drier, and the dried wet board is the thistle board. The paper-surface gypsum board has improved core performance, and thus has high strength and high fire resistance.)

1. The utility model provides a fire-resistant thistle board excels in, wherein, thistle board includes the mask paper in board core and the board core outside, the raw materials of board core include by mass: 100 parts of gypsum clinker, 0.1-0.3 part of water reducing agent, 0.2-0.8 part of modified starch, 0.03-0.05 part of foaming agent, 1.5-3.5 parts of refractory material and 70-80 parts of water.

2. The high strength fire resistant paper-faced gypsum board of claim 1, wherein the fire resistant material comprises glass fibers and mullite whiskers, the glass fibers being selected from any one of medium alkali glass fibers, alkali-free glass fibers and alkali-resistant glass fibers.

3. The high strength fire resistant paper-faced gypsum board of claim 2, wherein the glass fibers are 6-20mm in length and the glass fiber monofilaments are 5-6 μm in diameter;

the length of the mullite whisker is 5-10 mu m, and the length-diameter ratio is 20-30;

the mass ratio of the glass fiber to the mullite whisker is (3-4) to 1.

4. The high strength fire resistant paper-faced gypsum board of any one of claims 1-3, wherein the water reducing agent is selected from one or more of lignosulfonates, naphthalenesulfonates, sulfamates, and polycarboxylic acids.

5. The high strength fire resistant paper-faced gypsum board of any one of claims 1-3, wherein the modified starch is selected from one or more of modified corn starch, modified sorghum starch, modified tapioca starch, and modified potato starch.

6. The high strength fire resistant paper-faced gypsum board as claimed in any one of claims 1 to 3, wherein the specific surface area of the gypsum clinker is 3200-4000cm²/g。

7. The high strength fire resistant paper-faced gypsum board of any one of claims 1 to 3, wherein the foaming agent is an anionic surfactant selected from one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate, and a foam stabilizer; the foam stabilizer is silicone polyether emulsion; the mass ratio of the foaming agent to the foam stabilizer is 1 (0.8-1).

8. A method of making a high strength fire resistant paper-faced gypsum board as claimed in any one of claims 1 to 7, wherein the high strength fire resistant paper-faced gypsum board includes the steps of:

1) weighing gypsum clinker, a water reducing agent, modified starch, a foaming agent, a refractory material and water, mixing, adding into a stirrer, and uniformly mixing to obtain gypsum slurry;

2) lapping and firmly adhering the uniformly stirred gypsum slurry and the protective paper for forming to prepare a wet plate;

3) and (4) after the wet board is solidified, the wet board enters a drier, and the dried wet board is the thistle board.

9. The method of making a high strength fire resistant paper-faced gypsum board of claim 8,

the drying in the step 3) is more than two drying stages with descending drying temperature.

10. The method of making a high strength fire resistant paper-faced gypsum board of claim 8,

the drying in the step 3) has three drying stages, the drying time of the first drying stage is 0.5-1h, and the drying temperature is 150-200 ℃; the drying time of the second drying stage is 0.5-1.5h, and the drying temperature is 100-; the drying time of the third drying stage is 12-36h, and the drying temperature is 45-60 ℃.

Technical Field

The invention relates to the technical field of building materials, in particular to a high-strength fire-resistant paper-surface gypsum board and a preparation method thereof.

Background

The paper-surface gypsum board is a board made up by using building gypsum as main raw material, adding proper quantity of additive and using special-made board paper as protective surface through a certain preparation process. The gypsum board has the advantages of no pollution, strong processing performance and simple and convenient construction method.

Gypsum boards are widely used in large buildings, for example: hotels, hospitals, markets and the like, so the requirements on the strength and the fire resistance of the composite material are high. The gypsum partition board adopted by the wall products in the current building market has lighter weight and lower strength, more than 70 percent of the strength comes from the facing paper, the fire resistance is general, and the special purpose cannot be met. At present, the improvement of the strength and the fire resistance of the paper-surface gypsum board is mainly realized by adopting a fire-resistant type facing paper with higher strength. The adoption of the fire-resistant facing paper with higher strength can not improve the strength and fire resistance of the board core, and simultaneously can greatly increase the production cost of the gypsum board.

Therefore, it has become necessary to develop a gypsum board having higher strength and good fire resistance by improving the core quality of the gypsum board.

Disclosure of Invention

The application provides a high-strength fire-resistant paper-surface gypsum board and a preparation method thereof, and the high-strength fire-resistant paper-surface gypsum board has better mechanical property and fire resistance.

The application provides fire-resistant thistle board excels in, thistle board includes the mask paper in board core and the board core outside, the raw materials of board core include according to the part by mass: 100 parts of gypsum clinker, 0.1-0.3 part of water reducing agent, 0.2-0.8 part of modified starch, 0.03-0.05 part of foaming agent, 1.5-3.5 parts of refractory material and 70-80 parts of water. Optionally, the raw material of the high-strength fire-resistant paper-surface gypsum board consists of the materials.

In the high-strength fire-resistant paper-surface gypsum board provided by the invention, the water reducing agent is selected from one or more of lignosulphonates, naphthalenesulphonates, sulfamates and polycarboxylic acids.

In the high-strength fire-resistant paper-surface gypsum board provided by the invention, the modified starch is one or more of modified corn starch, modified sorghum starch, modified tapioca starch and modified potato starch.

In the high-strength fire-resistant paper-surface gypsum board provided by the invention, the specific surface area of the gypsum clinker is 3200-4000cm²/g。

In the high-strength fire-resistant paper-surface gypsum board provided by the invention, the fire-resistant material comprises glass fibers and mullite whiskers, and the glass fibers are selected from any one of medium-alkali glass fibers, alkali-free glass fibers and alkali-resistant glass fibers.

In the high-strength fire-resistant paper-surface gypsum board provided by the invention, the length of the glass fiber is 6-20mm, and the monofilament diameter of the glass fiber is 5-6 μm;

in the high-strength fire-resistant paper-surface gypsum board provided by the invention, the length of the mullite whisker is 5-10 μm, and the length-diameter ratio is 20-30;

in the high-strength fire-resistant paper-surface gypsum board provided by the invention, the mass ratio of the glass fiber to the mullite whisker is (3-4): 1.

In the high-strength fire-resistant paper-surface gypsum board provided by the invention, the modified starch is a starch derivative generated by chemically treating natural starch to change the molecular structure and the physicochemical property. The invention preferably adopts modified tapioca starch, the gelatinization temperature is 70-75 ℃, the modified starch can migrate to the contact layer of the protective paper and the gypsum core after being heated and gelatinized, so that the protective paper and the gypsum core are firmly bonded together.

In the high-strength fire-resistant paper-surface gypsum board provided by the invention, the foaming agent is an anionic surfactant and a foam stabilizer, and the anionic surfactant is selected from one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and fatty alcohol-polyoxyethylene ether sodium sulfate; the foam stabilizer is silicone polyether emulsion.

In another aspect, the present invention provides a method for preparing a high-strength fire-resistant paper-faced gypsum board, comprising the steps of:

1) weighing gypsum clinker, a water reducing agent, modified starch, a foaming agent, a refractory material and water, mixing, adding into a stirrer, and uniformly mixing to obtain gypsum slurry;

2) lapping and firmly adhering the uniformly stirred gypsum slurry and the protective paper for forming to prepare a wet plate;

3) and (4) after the wet board is solidified, the wet board enters a drier, and the dried wet board is the thistle board.

Optionally, the preparation method of the paper-surface gypsum board comprises the steps.

In the preparation method of the high-strength fire-resistant paper-surface gypsum board provided by the invention, the drying in the step 3) is more than two drying stages with descending drying temperature.

In the preparation method of the high-strength fire-resistant paper-surface gypsum board, the drying in the step 3) has three drying stages, the drying time of the first drying stage is 0.5-1h, and the drying temperature is 150-; the drying time of the second drying stage is 0.5-1.5h, and the drying temperature is 100-; the drying time of the third drying stage is 12-36h, and the drying temperature is 45-60 ℃.

The foaming agent used in the invention is a commercial foaming agent, and preferably, the foaming agent is prepared by compounding sodium dodecyl sulfate and silicone polyether emulsion.

Wherein the gypsum clinker is made of desulfurized gypsum, and the clinker making method can be carried out by adopting a method commonly used in the field. The gypsum clinker is prepared by a two-step calcination method, firstly, the desulfurized gypsum is quickly dried at high temperature in a hammer type scattering machine and part of crystal water is calcined, and then the desulfurized gypsum without part of crystal water is slowly calcined to remove the residual crystal water.

The strength of the gypsum board is further improved by increasing the refractory material, the water reducing agent and the foaming agent in the gypsum board, so that the toughness of the gypsum board is generally reduced after the density of the gypsum board is increased.

The paper-surface gypsum board prepared by the invention has excellent mechanical property, the horizontal and longitudinal fracture loads are respectively improved by 50 percent and 65 percent compared with the common paper-surface gypsum board, the paper-surface gypsum board has strong fire resistance, and the stability in case of fire is 8 to 9 hours.

The method has simple process, and the prepared gypsum plasterboard has high strength and excellent fire resistance, and is suitable for being used in places with higher requirements on the strength and the fire resistance of walls, such as hotels, hospitals, markets and the like.

Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the application may be realized and attained by the instrumentalities and methods described in the specification and claims.

Detailed Description

Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The embodiment of the invention provides a high-strength fire-resistant paper-surface gypsum board, which comprises a board core and a protective paper on the outer side of the board core, wherein the board core comprises the following raw materials in parts by mass: 100 parts of gypsum clinker, 0.1-0.3 part of water reducing agent, 0.2-0.8 part of modified starch, 0.03-0.05 part of foaming agent, 1.5-3.5 parts of refractory material and 70-80 parts of water. Optionally, the raw material of the paper-surface gypsum board is composed of the above materials.

In the embodiment of the invention, the water reducing agent is selected from one or more of lignosulphonates, naphthalenesulphonates, sulphamates and polycarboxylic acids.

In an embodiment of the invention, the modified starch is selected from one or more of modified corn starch, modified sorghum starch, modified tapioca starch and modified potato starch.

In the embodiment of the invention, the specific surface area of the gypsum clinker is 3200-4000cm²/g。

In an embodiment of the present invention, the refractory material includes glass fibers and mullite whiskers, and the glass fibers are selected from any one of medium alkali glass fibers, alkali-free glass fibers and alkali-resistant glass fibers.

In the embodiment of the invention, the length of the glass fiber is 6-20mm, and the monofilament diameter of the glass fiber is 5-6 μm;

in the embodiment of the invention, the length of the mullite whisker is 5-10 μm, and the length-diameter ratio is 20-30;

in the embodiment of the invention, the mass ratio of the glass fiber to the mullite whisker is 3-4: 1.

In the embodiment of the invention, the modified starch is a starch derivative which is prepared by chemically treating natural starch and introducing certain chemical groups to change the molecular structure and the physicochemical property. The invention preferably adopts modified tapioca starch, the gelatinization temperature is 70-75 ℃, the modified starch can migrate to the contact layer of the protective paper and the gypsum core after being heated and gelatinized, so that the protective paper and the gypsum core are firmly bonded together.

In the embodiment of the invention, the gypsum clinker is semi-hydrated gypsum prepared by firstly quickly drying desulfurized gypsum at high temperature in a hammer type scattering machine and calcining partial crystal water, and then slowly calcining the residual crystal water by indirect heat exchange; the water reducing agent is a commercial high-efficiency water reducing agent; the modified starch is modified corn starch; the refractory material is a mixture of glass fiber and mullite whisker.