CN111606679B - Paper-surface gypsum board and preparation method thereof - Google Patents

Paper-surface gypsum board and preparation method thereof Download PDF

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Publication number
CN111606679B
CN111606679B CN201910677132.0A CN201910677132A CN111606679B CN 111606679 B CN111606679 B CN 111606679B CN 201910677132 A CN201910677132 A CN 201910677132A CN 111606679 B CN111606679 B CN 111606679B
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board
gypsum
paper
carbon fiber
drying
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CN111606679A (en
Inventor
葛俊巧
陈红霞
张晓菲
刘文君
周全光
杨潇
冉秀云
杨正波
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China National Building Materials Innovation and Technology Research Institute Co Ltd
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China National Building Materials Innovation and Technology Research Institute Co Ltd
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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
    • 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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/50—Producing shaped prefabricated articles from the material specially adapted for producing articles of expanded material, e.g. cellular concrete
    • 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
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
    • 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
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • C04B2111/0062—Gypsum-paper board like 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
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density

Abstract

The invention provides a paper-surface gypsum board and a preparation method thereof, wherein the paper-surface gypsum board comprises a board core and a protective paper on the outer side of the board core, and the raw materials of the board core comprise gypsum clinker, carbon fiber and latex. Optionally, the core raw material may further include starch, a foaming agent, and a coupling agent. The preparation method of the paper-surface gypsum board comprises the following steps of firstly, uniformly stirring and mixing a coupling agent and slurry water to obtain a mixture; then uniformly mixing the gypsum clinker, the carbon fiber, the latex, the starch and the obtained mixture to form slurry; secondly, uniformly mixing the slurry and a foaming agent, pouring the mixture on a protective paper, and overlapping, firmly adhering and forming to prepare a wet plate; and finally, after the wet board is solidified, the wet board enters a dryer, and the dried wet board is the paper-surface gypsum board. The prepared gypsum plaster board has the advantages that the cross-section bonding strength between gypsum crystals and carbon fibers is improved through the synergistic effect of the components, and the toughness of the board is further enhanced.

Description

Paper-surface gypsum board and preparation method thereof
Technical Field
The present invention relates to building material and paper-surface gypsum board technology, and is especially one kind of paper-surface gypsum board and its preparation process.
Background
The paper-surface gypsum board is a light building board which is made up by using building gypsum as main raw material, adding a small quantity of additive and water, stirring them, continuously pouring them between two layers of protective paper, edge-sealing, flattening, solidifying, cutting and drying. However, paper-faced gypsum board is a brittle material and its development and use is limited by its low flexural strength and impact resistance. Aiming at the problems of brittleness and poor toughness, people generally use fibers to toughen the gypsum board so as to prepare the gypsum board with wider application range.
The fiber toughened gypsum board not only can keep the characteristics of light weight, sound and heat insulation, corrosion resistance and the like of the gypsum board, but also can improve the mechanical property and the water resistance of the gypsum board, and has great significance for the application of the gypsum board. The toughening fiber materials commonly used at home and abroad at present comprise: glass fiber, plant fiber, carbon fiber, vinylon fiber, straw fiber, aluminum silicate fiber, organic synthetic fiber, etc. The carbon fiber is a fibrous carbon material, has light weight, high strength, good tensile strength, good corrosion resistance, good high temperature resistance and low temperature resistance, is insoluble in acid and alkali, and can still keep flexibility at the temperature below minus 180 ℃. Carbon fibers have a greater potential for improving material properties than other fibers. Although the carbon fiber has remarkable performance in reinforcing and toughening materials, the application of the carbon fiber in the gypsum field is poor, and related researches are only limited to gypsum molds and gypsum electric jackets at present.
Although the carbon fiber has excellent mechanical properties, the carbon fiber has a smooth surface and less oxygen-containing groups, the effect of combining with the gypsum crystal is not ideal, and the combination interface between the carbon fiber and the gypsum crystal is fragile; the hydrophobicity of the carbon fiber can cause the carbon fiber to agglomerate in the using process, so that the carbon fiber is not beneficial to uniform dispersion in a gypsum board core, and the performance of the carbon fiber is influenced; in addition, most of the patented technologies for fiber-toughened gypsum boards published so far use separate addition of fibers.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The application provides a high-toughness paper-surface gypsum board and a preparation method thereof, which can overcome the defects of the prior invention, and the carbon fibers and the gypsum are pretreated, and natural latex is introduced to enhance the bonding strength of the cross sections of the carbon fibers and gypsum crystals and form a cross-linked net structure with the latex film, so that the toughness of the gypsum board is effectively enhanced.
In order to overcome the defects in the prior art, the invention provides a method for toughening a paper-surface gypsum board, which has simple and convenient process and good effect: the method comprises the following steps of carrying out primary pretreatment on carbon fibers by using a special-effect adhesive, carrying out modification pretreatment on gypsum by using a coupling agent, carrying out secondary pretreatment on the carbon fibers subjected to the primary pretreatment, and doping the pretreated carbon fibers into a gypsum board prepared by using the pretreated gypsum as a base material to enhance the interface bonding strength between gypsum crystals and the carbon fibers; in addition, the natural latex is added in the preparation process of the gypsum board, so that gypsum crystals, carbon fibers and latex films are mutually crosslinked, and the toughness of the board is further enhanced.
The application provides a thistle board, 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, 1-3 parts of carbon fiber and 1-3 parts of latex. Optionally, the core raw material of the gypsum board consists of 100 parts of gypsum clinker, 1-3 parts of carbon fiber and 1-3 parts of latex.
In the paper-surface gypsum board with high toughness provided by the invention, the raw materials of the board core comprise, by mass: 100 parts of gypsum clinker, 1-3 parts of carbon fiber, 1-3 parts of latex, 0.4-1 part of starch, 0.01-1 part of foaming agent solution, 1-5 parts of coupling agent and 60-70 parts of water. Optionally, the core stock consists of the above-described stock.
In the high-toughness paper-surface gypsum board provided by the invention, the specific surface area of the gypsum clinker is 3200-one 4800cm2/g。
The main component of the gypsum clinker is calcium sulfate hemihydrate and is prepared from natural gypsum or industrial byproduct gypsum, and the preparation method of the clinker can be carried out by adopting a method commonly used in the field.
In the paper-faced gypsum board provided with high toughness according to the present invention, the carbon fibers have a fiber length of 5 to 25 mm.
In the high-toughness paper-surface gypsum board provided by the invention, the tensile strength of the carbon fiber is 3500-3850MPa, the elastic modulus is 230-430GPa, the elongation is 0.6-1.5%, and the density is 1.76-1.94g/cm3The fibers of (4).
In the paper-surface gypsum board with high toughness, the carbon fiber is modified carbon fiber, and the carbon fiber is treated by soaking in alkaline solution with adhesive.
In the paper-surface gypsum board with high toughness provided by the invention, the modification temperature of the carbon fiber is 40-80 ℃;
in the paper-faced gypsum board of the present invention providing high toughness, the adhesive is dopa or a derivative thereof (dopa);
in the paper-surface gypsum board with high toughness provided by the invention, the derivative of the dopa is selected from one or more of dopaquinone, dopamine, 3, 4-dihydroxyacrylic acid, 4-hydroxyacrylic acid and N-benzyloxycarbonyl-3, 4-benzyloxyphenylalanine;
in the high tenacity paper-faced gypsum board provided by the present invention, the adhesive concentration is 1.0-3.0 g/L;
in the gypsum plasterboard of the invention providing high toughness, the alkaline solution is selected from NaOH solution, Na2CO3Solution and Na3PO4One or more of a solution;
in the gypsum plasterboard of the invention, the pH of the alkaline solution is 8-10;
in the high tenacity paper-faced gypsum board provided by the present invention, the latex has a solids content of 60-70%.
In the paper-surface gypsum board with high toughness provided by the invention, the latex is pretreated latex, and the pretreatment method of the latex is ultrasonic treatment at 20kHz for 60-300 s.
In the gypsum plasterboard of the invention providing high toughness, the starch is a modified starch;
in the present invention, there is provided a high tenacity gypsum plasterboard, the starch is selected from one or more of modified corn starch, modified sorghum starch, modified tapioca starch and modified potato starch. Optionally, the gelatinization temperature is 70-75 ℃.
In the paper-faced gypsum board of the present invention providing high toughness, the foaming agent solution is a solution in which an anionic surfactant and a foam stabilizer are solutes, optionally, the foaming agent solution has a mass fraction of 0.2 to 0.6%.
In the paper-surface gypsum board with high toughness provided by the invention, the mass ratio of the anionic surfactant to the foam stabilizer is (7-9) to (1-3);
in the gypsum plasterboard of the invention providing high toughness, the anionic surfactant is selected from one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, sodium fatty alcohol polyoxyethylene ether sulfate;
in the paper-surface gypsum board provided by the invention with high toughness, the foam stabilizer is selected from one or two of silicone polyether emulsion and polyvinyl alcohol;
preferably, a foaming agent compounded by sodium dodecyl sulfate and polyvinyl alcohol is adopted, the mass fraction of the foaming agent is 0.2-0.6%, the rotating speed is 1500-.
In the paper-faced gypsum board provided with high toughness according to the present invention, the coupling agent is a silane coupling agent. Optionally, the coupling agent is selected from one or more of Si69, KH-550, KH-560 and KH-570.
On the other hand, the invention provides a preparation method of the high-toughness paper-surface gypsum board, which comprises the following steps:
1) stirring and mixing the coupling agent and slurry water uniformly to obtain a mixture;
2) uniformly mixing gypsum clinker, carbon fiber, latex, starch and the mixture obtained in the step 1) to form slurry;
3) uniformly mixing the slurry and the foaming agent, pouring the mixture on the protective paper, and overlapping and firmly adhering the mixture to form a wet plate;
4) 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 consists of the steps.
In the method for preparing the high-toughness paper-surface gypsum board, the drying in the step 4) is more than two drying stages with descending drying temperature.
In the preparation method of the high-toughness 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 invention increases the interface adhesive force among the raw materials through the synergistic effect of the components to form a cross-linked network structure. When the board is acted by external force, the load is transferred to the carbon fiber and the latex film with excellent fracture toughness through the interface, the carbon fiber and the latex film bear stress and consume part of energy, the expansion of microcracks is inhibited, and the toughness of the gypsum board is further improved.
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
The experimental method of the present invention is further described below by way of specific examples, but the scope of the present invention is not limited thereto. The starting materials used in the following examples are all common commercial products unless otherwise specified.
The embodiment of the application part provides a thistle board, 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, 1-3 parts of carbon fiber and 1-3 parts of latex. Optionally, the core raw material of the gypsum board consists of 100 parts of gypsum clinker, 1-3 parts of carbon fiber and 1-3 parts of latex.
In the embodiment of the invention, the core comprises the following raw materials in parts by mass: 100 parts of gypsum clinker, 1-3 parts of carbon fiber, 1-3 parts of latex, 0.4-1 part of starch, 0.01-1 part of foaming agent solution, 1-5 parts of coupling agent and 60-70 parts of water. Optionally, the core stock consists of the above-described stock.
In the embodiment of the invention, the specific surface area of the gypsum clinker is 3200-one 4800cm2/g。
The main component of the gypsum clinker is calcium sulfate hemihydrate and is prepared from natural gypsum or industrial byproduct gypsum, and the preparation method of the clinker can be carried out by adopting a method commonly used in the field.
In the embodiment of the invention, the fiber length of the carbon fiber is 5-25 mm.
In the embodiment of the invention, the tensile strength of the carbon fiber is 3500-3850MPa, the elastic modulus is 230-430GPa, the elongation is 0.6-1.5 percent, and the density is 1.76-1.94g/cm3The fibers of (1).
In the embodiment of the invention, the carbon fiber is modified carbon fiber, and the carbon fiber is modified by soaking the carbon fiber in an alkaline solution with an adhesive for treatment.
In the embodiment of the invention, the modification temperature of the carbon fiber is 40-80 ℃;
in embodiments of the invention, the adhesive is dopa or derivatives thereof (dopa);
in the embodiment of the invention, the dopa derivatives are selected from one or more of dopaquinone, dopamine, 3, 4-dihydroxyacrylic acid, 4-hydroxyacrylic acid and N-benzyloxycarbonyl-3, 4-benzyloxyphenylalanine;
in the embodiment of the invention, the concentration of the adhesive is 1.0-3.0 g/L;
in an embodiment of the invention, the alkaline solution is selected from NaOH solution, Na2CO3Solution and Na3PO4One or more of a solution;
in the embodiment of the invention, the pH value of the alkaline solution is 8-10;
in the examples of the invention, the solids content of the latex is 60 to 70%.
In the embodiment of the invention, the latex is pretreated latex, and the pretreatment method of the latex is ultrasonic treatment at 20kHz for 60-300 s.
In an embodiment of the invention, the starch is a modified starch;
in an embodiment of the invention, the starch is selected from one or more of modified corn starch, modified sorghum starch, modified tapioca starch and modified potato starch. Optionally, the gelatinization temperature is 70-75 ℃.
In the embodiment of the present invention, the foaming agent solution is a solution in which an anionic surfactant and a foam stabilizer are solutes, and optionally, the mass fraction of the foaming agent solution is 0.2 to 0.6%.
In the embodiment of the invention, the mass ratio of the anionic surfactant to the foam stabilizer is (7-9) to (1-3);
in the embodiment of the invention, the anionic surfactant is selected from one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium fatty alcohol-polyoxyethylene ether sulfate;
in the embodiment of the invention, the foam stabilizer is selected from one or two of silicone polyether emulsion and polyvinyl alcohol;
preferably, a foaming agent compounded by sodium dodecyl sulfate and polyvinyl alcohol is adopted, the mass fraction of the foaming agent is 0.2-0.6%, the rotating speed is 1500-.
In an embodiment of the present invention, the coupling agent is a silane coupling agent. Optionally, the coupling agent is selected from one or more of Si69, KH-550, KH-560 and KH-570.
In an embodiment of the present invention, the present invention provides a method for preparing the above high-toughness paper-surface gypsum board, including the following steps:
1) stirring and mixing the coupling agent and slurry water uniformly to obtain a mixture;
2) uniformly mixing gypsum clinker, carbon fiber, latex, starch and the mixture obtained in the step 1) to form slurry;
3) uniformly mixing the slurry and the foaming agent, pouring the mixture on the protective paper, and overlapping and firmly adhering the mixture to form a wet plate;
4) 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 consists of the steps.
In the embodiment of the present invention, the drying in step 4) is performed in more than two drying stages with decreasing drying temperatures.
In the embodiment of the invention, the drying in 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 ℃.
Example 1
The high-toughness paper-surface gypsum board prepared in the embodiment specifically comprises the following raw materials: the specific surface area of the gypsum clinker is 3980cm2(ii)/g; the starch is modified corn starch; the coupling agent is selected from KH-550 coupling agent;
the carbon fiber is purchased from Touli Japan company model T300, the tensile strength of the carbon fiber is 3645MPa, the elastic modulus is 310GPa, the elongation is 0.6 percent, and the density is 1.78g/cm3。
The modification process of the carbon fiber is as follows: selecting carbon fibers with the length of 8mm, soaking the carbon fibers in an alkaline NaOH solution with adhesive 3, 4-dihydroxyacrylic acid and the pH value of 8.5 at 40 ℃ for treatment for 4 hours, wherein the concentration of the adhesive is 1.5 g/L.
The latex is natural latex which is purchased from Jitian chemical industry Co., Ltd, the model H0101, and the natural latex is pretreated, wherein the pretreatment process comprises the following steps: the natural latex was sonicated at 20KHz for 100 s.
The natural latex has a solids content of 62%.
The foaming agent is composed of an anionic surfactant sodium dodecyl sulfate and a foam stabilizer polyvinyl alcohol 1788, wherein the mass ratio of the anionic surfactant to the foam stabilizer is (9): 1; stirring the mixture for 3min at the rotating speed of 1800r/min to prepare a foaming agent solution, wherein the mass fraction of the foaming agent is 0.2%.
The embodiment provides a high-toughness paper-surface gypsum board, which comprises the following raw materials in percentage by mass: gypsum clinker: 100 parts of modified carbon fiber: 2 parts of pretreated natural latex: 1.2 parts of starch: 0.4 part of foaming agent solution: 0.02 part of coupling agent: 2 parts of slurry water: 68 parts.
The high-toughness paper-surface gypsum board of the embodiment is prepared by the following method:
1. adding the coupling agent into the slurry according to a certain proportion, and uniformly stirring and mixing;
2. weighing gypsum clinker, modified carbon fiber, natural latex and starch in proportion, adding the weighed raw materials and slurry water added with a coupling agent into a mixer together, and uniformly mixing to form slurry;
3. adding a foaming agent solution at the outlet of the mixer, mixing the foaming agent solution with the slurry, and pouring the mixture on the mask paper;
4. laying back paper, extruding, solidifying, cutting and drying to obtain the gypsum plaster board.
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 1.5h, and the drying temperature is 100 ℃; the drying time of the third drying stage was 30h and the drying temperature was 45 ℃.
Example 2
The high-toughness paper-surface gypsum board prepared in the embodiment specifically comprises the following raw materials: the specific surface area of the gypsum clinker is 4143cm2(ii)/g; the starch is modified corn starch; the coupling agent is selected from KH-560 coupling agent;
the carbon fiber is purchased from Tollii Japan company model T300, the tensile strength of the carbon fiber is 3706MPa, the elastic modulus is 358GPa, the elongation is 0.75 percent, and the density is 1.78g/cm3。
The carbon fiber is modified by the following steps: selecting carbon fiber with length of 10mm, soaking the carbon fiber in Na with adhesive 4-hydroxy acrylic acid at 45 deg.C and pH of 8.92CO3Mixing with NaOHThe solution is treated for 4.5 hours, and the concentration of the adhesive is 1.8 g/L.
The latex is natural latex which is purchased from Jitian chemical industry Co., Ltd, the model H0101, and the natural latex is pretreated, wherein the pretreatment process comprises the following steps: the natural latex was sonicated at 20KHz for 150 s.
The natural rubber latex had a solids content of 63.5%.
The foaming agent consists of an anionic surfactant sodium dodecyl benzoate and a foam stabilizer polyvinyl alcohol 1788, wherein the mass ratio of the anionic surfactant to the foam stabilizer is 9: 2; stirring the mixture for 3min at the rotating speed of 1800r/min to prepare a foaming agent solution, wherein the mass fraction of the foaming agent is 0.2%.
The embodiment provides a high-toughness paper-surface gypsum board, which comprises the following raw materials in percentage by mass: gypsum clinker: 100 parts of modified carbon fiber: 1.8 parts of pretreated natural latex: 1.8 parts of starch: 0.8 part of foaming agent solution: 0.04 part of coupling agent: 3 parts of slurry water: 65 parts.
The high tenacity paper-faced gypsum board of this example was prepared in the same manner as in example 1.
The gypsum board made in example 2 was dried as follows: the drying time of the first drying stage is 0.8h, and the drying temperature is 160 ℃; the drying time of the second drying stage is 1.2h, and the drying temperature is 100 ℃; the drying time of the third drying stage was 26h and the drying temperature was 50 ℃.
Example 3
The high-toughness paper-surface gypsum board prepared in the embodiment specifically comprises the following raw materials: the specific surface area of the gypsum clinker is 4329cm2(ii)/g; the starch is modified cassava starch; the coupling agent is selected from KH-570 coupling agents;
the carbon fiber is purchased from Torriy company of Japan, the model T300, the tensile strength of the carbon fiber is 3753MPa, the elastic modulus is 376GPa, the elongation is 0.84 percent, and the density is 1.81g/cm3。
The modified carbon fiber is modified in the following process: selecting carbon fiber with length of 12mm, soaking the carbon fiber in Na with adhesive dopamine at 50 deg.C and pH of 9.32CO3And Na3PO4The mixed solution is treated for 5 hours, and the concentration of the adhesive is 2.1 g/L.
The latex is natural latex which is purchased from Jitian chemical industry Co., Ltd, the model H0101, and the natural latex is pretreated, wherein the pretreatment process comprises the following steps: the natural latex was sonicated at 20KHz for 200 s.
The natural latex had a solids content of 62.4%.
The foaming agent consists of an anionic surfactant sodium dodecyl benzoate and a foam stabilizer polyvinyl alcohol 1788, wherein the mass ratio of the anionic surfactant to the foam stabilizer is 8: 1; stirring for 3.5min at the rotating speed of 1500r/min to prepare a foaming agent solution, wherein the mass fraction of the foaming agent is 0.3%.
The embodiment provides a high-toughness paper-surface gypsum board, which comprises the following raw materials in percentage by mass: gypsum clinker: 100 parts of modified carbon fiber: 1.2 parts of pretreated natural latex: 2 parts of starch: 0.5 part of foaming agent solution: 0.06 part of coupling agent: 3.5 parts of slurry water: 63 parts of.
The high toughness paper-faced gypsum board of this example was prepared in the same manner as in example 1.
The gypsum board made in example 3 was dried as follows: the drying time of the first drying stage is 1h, and the drying temperature is 150 ℃; the drying time of the second drying stage is 1h, and the drying temperature is 130 ℃; the drying time of the third drying stage was 24h and the drying temperature was 55 ℃.
Example 4
The carbon fiber for preparing the high-toughness paper-surface gypsum board in the embodiment is unmodified carbon fiber which is purchased from Tooli Japan, model T300, and the carbon fiber with the length of 8mm is selected, the tensile strength of the unmodified carbon fiber is 3613MPa, the elastic modulus is 290GPa, the elongation is 0.6 percent, and the density is 1.80g/cm3。
The raw materials other than carbon fiber and the gypsum board were prepared in the same manner as in example 1.
Example 5
The latex for preparing the high-toughness paper-surface gypsum board in the embodiment is natural latex which is purchased from Jitian chemical Co., Ltd, is H0101 in model, has a solid content of 62%, and is not subjected to pretreatment.
The raw materials other than latex and the gypsum board were prepared in the same manner as in example 1.
Comparative example 1
The carbon fiber for preparing the high-toughness paper-surface gypsum board in the comparative example is modified carbon fiber which is purchased from a Nippon Dongli company model T300, and the modification process of the modified carbon fiber is as follows:
selecting carbon fibers with the length of 8mm, soaking the carbon fibers in an alkaline NaOH solution with the pH value of 8.5 at the temperature of 40 ℃ for treatment for 4 hours, wherein the modified carbon fibers have the tensile strength of 3645MPa, the elastic modulus of 310GPa, the elongation of 0.6 percent and the density of 1.78g/cm3。
The plate core comprises the following raw materials in parts by mass: 100 parts of gypsum clinker, 5 parts of carbon fiber and 0.6 part of latex.
The raw materials other than the conditions for modifying the carbon fiber and the mass ratio of the raw materials and the method for producing the gypsum board were the same as in example 1.
Comparative example 2:
the raw materials for making the high-tenacity paper-faced gypsum board of this comparative example do not contain natural latex, and the raw materials other than latex and the method for making the gypsum board are the same as those of example 1.
Comparative example 3
The raw materials of the core of the high-toughness paper-surface gypsum board prepared in the comparative example comprise the following components in parts by mass: 100 parts of gypsum clinker, 0.5 part of carbon fiber and 6 parts of latex.
The raw materials and gypsum board of this comparative example were prepared in the same manner as in example 1, except for the mass ratio of the raw materials.
Performance testing
The 9.5mm gypsum plasterboards prepared in the above examples and comparative examples were tested for areal density and transverse and longitudinal breaking load, damp deflection, fire stability and bond rating of the face-protecting paper according to the Chinese national standard GB/T9775-:
TABLE 19.5 mm thistle board Performance test results
Figure BDA0002143642300000111
Figure BDA0002143642300000121
Examples 1, 2, 3 of the present invention are further detailed descriptions of the present invention; the raw state in example 4 was unmodified carbon fibers and pretreated latex; the raw material state in example 5 was modified carbon fiber and latex without pretreatment; in comparative example 1, no carbon fiber adhesive is added, so that the interface bonding between the carbon fibers and the gypsum is poor; no latex was added to comparative example 2; in comparative example 3, the preparation process was consistent, but the amounts of the components were not within the scope of the claims.
As can be seen from example 4 and comparative example 1, when other conditions are consistent, modification treatment of carbon fibers is necessary, especially the addition of an adhesive is significant, and the mechanical property and the elastic modulus of the gypsum board can be greatly improved by adding the modified carbon fibers. As can be seen from example 5 and comparative example 2, when other conditions are consistent, the mechanical properties and toughness of the gypsum board are obviously improved by adding the latex and modifying the latex. As can be seen from comparative example 3, the quality of the final gypsum board formed does not meet the national standards if the amount of each component is not within the scope of the claims.
As is clear from examples 1, 2 and 3, the gypsum boards were compared with commercially available 9.5mm gypsum plasterboards (areal density: 6.5 kg/m)2-7.0kg/m2The average transverse breaking load is about 185N, the minimum is about 160N, the average longitudinal breaking load is about 420N, and the minimum is about 380N), the density of the surface of the paper-surface gypsum board prepared by the method is lower, the mechanical property is better, particularly, the elastic modulus in example 3 is improved by 26.17% compared with that of a pure gypsum board, and the gypsum board provided by the invention is proved to have high toughness.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.

Claims (14)

1. The paper-surface gypsum board comprises a board core and a protective paper outside the board core, wherein the board core is prepared from the following raw materials in parts by mass: 100 parts of gypsum clinker, 1-3 parts of carbon fiber and 1-3 parts of latex, 0.4-1 part of starch, 0.01-1 part of foaming agent solution, 1-5 parts of coupling agent and 60-70 parts of water;
the carbon fiber is modified carbon fiber;
the modification method of the carbon fiber comprises the steps of soaking the carbon fiber in an alkaline solution with an adhesive for treatment;
the modification temperature is 40-80 ℃; the adhesive is dopa or a derivative thereof;
the concentration of the adhesive is 1.0-3.0 g/L; the alkaline solution is selected from NaOH solution and Na2CO3Solution and Na3PO4One or more of a solution; the pH value of the alkaline solution is 8-10;
the dopa and its derivatives are selected from one or two of dopaquinone and dopamine.
2. The gypsum plaster board of claim 1, wherein the gypsum clinker has a specific surface area of 3200-2/g。
3. The gypsum plasterboard of claim 1, wherein the carbon fibres have a fibre length of 5-25 mm.
4. The gypsum plasterboard of claim 3, wherein the carbon fibers have a tensile strength of 3500-3850MPa, an elastic modulus of 230-430GPa, an elongation of 0.6-1.5%, and a density of 1.76-1.94g/cm3The fibers of (1).
5. The gypsum plasterboard of claim 1, wherein the latex has a solids content of 60-70%.
6. The gypsum plasterboard of claim 5, wherein the latex is pre-treated by ultrasonication at 20kHz for 60-300 s.
7. The paper-faced gypsum board of any one of claims 2-6, wherein the starch is a modified starch.
8. The gypsum plasterboard of claim 7, wherein the starch is selected from one or more of a modified corn starch, a modified sorghum starch, a modified tapioca starch and a modified potato starch.
9. The gypsum plasterboard of any one of claims 2 to 6, wherein the foaming agent solution is a solution consisting of an anionic surfactant and a foam stabilizer, the mass ratio of the anionic surfactant to the foam stabilizer being 7-9: 1-3;
the anionic surfactant is selected from one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and sodium fatty alcohol-polyoxyethylene ether sulfate;
the foam stabilizer is selected from one or two of silicone polyether emulsion and polyvinyl alcohol.
10. The gypsum plasterboard of claim 9, wherein the mass fraction of the foaming agent solution is 0.2-0.6%.
11. The gypsum plasterboard of any one of claims 2 to 6, wherein the coupling agent is a silane coupling agent.
12. A method of making the paper-faced gypsum board of any one of claims 1 to 11, comprising the steps of:
1) stirring and mixing the coupling agent and water uniformly to obtain a mixture;
2) uniformly mixing gypsum clinker, carbon fiber, latex, starch and the mixture obtained in the step 1) to form slurry;
3) uniformly mixing the slurry and the foaming agent, pouring the mixture on the protective paper, and overlapping and firmly adhering the mixture to form a wet plate;
4) and (4) after the wet board is solidified, the wet board enters a drier, and the dried wet board is the thistle board.
13. The method of making a paper-faced gypsum board according to claim 12,
the drying in the step 4) is more than two drying stages with descending drying temperature.
14. The method of making a paper-faced gypsum board according to claim 12 or 13,
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 ℃.
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