Water-resistant and moisture-proof gypsum plaster board and preparation process thereof

Abstract

The invention relates to the technical field of building materials, and particularly discloses a water-resistant and moisture-proof gypsum plaster board and a preparation technology thereof.Modified basalt fibers and modified styrene-butadiene latex emulsion are added into a gypsum board core formula, so that combination between the fibers, combination between gypsum materials and combination between the gypsum materials and the fibers are firmer, and toughness is higher; meanwhile, the modified styrene-butadiene latex emulsion contains an initiator persulfate, the modified basalt fiber contains a double-bond group, and in the hot press molding process, addition reaction occurs between double bonds, so that the crosslinking density is improved, the compactness of the plate is higher, and the water resistance and moisture resistance are further enhanced; the gypsum plaster board prepared by the invention has excellent water resistance and moisture resistance, also has good mechanical properties, is superior to similar products in the market, and has a better market prospect.

Description

Technical Field

[0001] The invention relates to the technical field of building materials, and in particular to a water-resistant and moisture-proof gypsum board and a preparation process thereof. Background Art

[0002] As a common home decoration material, gypsum board is widely used in many fields such as suspended ceilings, partitions, interior wall veneers, ceilings, and sound-absorbing panels due to its advantages such as light weight, convenient construction, fire resistance, good sound insulation, green environmental protection, and high plasticity. It not only has a good decorative effect, but also can effectively improve the comfort and aesthetics of the room. However, although gypsum board performs well in most dry environments, it is prone to many challenges when used in spaces with high humidity such as bathrooms, showers, and kitchens. This is because the porous structure of gypsum board makes it easy to absorb moisture in the air. This moisture will penetrate into the hardened body along the holes and capillaries inside the gypsum board, dissolving the crystallization contact points in the gypsum hardened body and causing recrystallization, which reduces the strength of the gypsum board and causes the board to absorb water, collapse, and fall off.

[0003] At present, the methods to improve the strength, toughness and water resistance of gypsum board mainly focus on using higher strength water-resistant facing paper and adding fiber materials to gypsum board. Using stronger water-resistant facing paper can effectively enhance the water resistance of the surface and prevent water penetration and damage, but this method cannot improve the strength and water resistance of the board core; in addition, although adding fiber materials to gypsum board can improve its toughness to a certain extent and help improve the flexural strength, the overall strength of fiber-reinforced gypsum board is still low, and the effect of improving toughness is limited.

[0004] For example, Chinese patent document CN201711335775.4 discloses a water-resistant paper-faced gypsum board, including a composite waterproofing agent, wherein the composite waterproofing agent comprises the following components: silicone oil, methyl silicone resin, silane coupling agent, polyurethane emulsion and one or more of lime or cement. By adding the composite waterproofing agent, the water resistance of the prepared water-resistant gypsum board is improved to a certain extent, but the mechanical properties still need to be further improved.

[0005] In order to improve the mechanical properties, gypsum board has tried every possible means, but the final results are far from satisfactory. This is because the added fiber material has limited effect on increasing the mechanical properties.

[0006] In recent years, more and more industry players have paid attention to the important role of modified basalt fiber in improving mechanical properties in the fields of concrete, composite plastics, etc. Modified basalt fiber is a fiber that has been physically or chemically modified on the basis of basalt fiber. Through surface modification, basalt fiber can be more closely combined with matrix materials such as resin when reinforcing composite materials, so that the comprehensive properties of composite materials, such as strength, toughness, and corrosion resistance, can be improved. For example: Dong Wei et al. studied the influence of basalt fiber dosage on the bearing and deformation properties of aeolian sand concrete. The paper believes that a reasonable ratio can effectively improve the key working performance of basalt fiber concrete. Liu Yushan et al. conducted a modification study on ordinary concrete materials. The paper found that the ability of concrete materials with different basalt fiber ratios to resist deformation and damage was significantly different. Yu Yinghua et al. used different contents of basalt fiber and resin to dope and modify cement mortar, and found that a certain proportion of fiber and resin can significantly improve the material's flexural strength and deformation performance. The performance of basalt fiber modified concrete is closely related to the material type and its dosage. For another example, Chinese patent CN116120029A discloses a basalt fiber concrete with ultra-high mechanical properties and a preparation method and application technical solution thereof; Chinese patent CN1064780040A discloses a high-toughness environmentally friendly building material and a preparation method technical solution thereof, and so on.

[0007] As for the gypsum board industry, some industry players have also made various attempts. For example, Chinese patent CN116023112A discloses a technical solution for gypsum materials used in jewelry molds, which increases the compressive strength and flexural strength by adding modified basalt fibers. Chinese patent CN113061008A discloses a technical solution for phosphogypsum wet-mixed mortar for load-bearing structures, which increases the bonding properties of the mortar by using modified basalt fibers.

[0008] As for gypsum board, there is no related technical report in the prior art, which may be related to the fact that gypsum board is more concerned with its mechanical properties of anti-pulling on the basis of water resistance and corrosion resistance. Factors such as building settlement and long-term accumulated moisture put more pressure on the mechanical properties of gypsum board's anti-shear force.

[0009] The prior art urgently needs a gypsum board solution with good water resistance, strong corrosion resistance and tear resistance. Summary of the invention

[0010] In view of the deficiencies in the prior art, the object of the present invention is to provide a water-resistant and moisture-proof paper-faced gypsum board and a preparation process thereof, which are prepared by adding modified basalt fiber and modified styrene-butadiene latex emulsion into the gypsum board core formula so that the bonding between fibers, between gypsum materials, and between gypsum materials and fibers is more firm, the toughness is higher, the density is higher, the water and moisture resistance is enhanced, and the board has good mechanical properties.

[0011] In order to achieve the above object, according to one aspect of the present invention, the following technical solution is adopted: A water-resistant and moisture-proof paper-faced gypsum board comprises two layers of facing paper and a gypsum board core between the two layers of facing paper. The raw materials of the gypsum board core consist of the following components in parts by weight: 100 parts of gypsum clinker, 10-15 parts of modified basalt fiber, 5-10 parts of starch, 5-10 parts of modified styrene-butadiene latex emulsion, 1-2 parts of water reducer, 0.2-0.5 parts of retarder and 40-60 parts of water.

[0012] Preferably, in the technical solution disclosed in the present invention, the modified basalt fiber can be selected to be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, and 15 parts, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0013] Specifically, the preparation method of the modified basalt fiber is as follows: S1, dispersing basalt fiber in ethanol aqueous solution, then adding aminosilane coupling agent thereto, stirring, then filtering, washing and drying to obtain amino-modified basalt fiber; S2, dispersing the amino-modified basalt fiber in an organic solvent, then adding oleoyl chloride and triethylamine thereto, heating and reacting under a nitrogen atmosphere, and after the reaction is completed, filtering, washing and drying to obtain the modified basalt fiber.

[0014] Wherein, in step S1, the mass ratio of the basalt fiber and the aminosilane coupling agent is 10-15:2-5, for example, 10:2, 10:3, 10:4, 10:5, 12:3, 12:4, 15:2, 15:3, 15:4, 15:5 can be selected, but it is not limited to the listed values, and other values ​​not listed in the numerical range are also applicable.

[0015] More specifically, the aminosilane coupling agent is selected from γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane or N-aminoethyl-3-aminopropyltriethoxysilane.

[0016] Wherein, in step S2, the mass ratio of the amino-modified basalt fiber, oleoyl chloride and triethylamine is 10-20:3-6:5-10.

[0017] Among them, in step S2, the temperature of the heating reaction is 50-70°C, for example, 50°C, 55°C, 60°C, 65°C, and 70°C can be selected; the time of the heating reaction is 3-5h, for example, 3h, 3.5h, 4h, 4.5h, and 5h can be selected, but it is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0018] Basalt fiber has the characteristics of high temperature resistance, high tensile strength and good chemical resistance. Adding it to gypsum board can improve the strength of gypsum board, but basalt fiber is easy to agglomerate in the gypsum matrix, resulting in uneven fiber distribution. This uneven distribution will cause stress concentration when subjected to stress, causing the test piece to be destroyed prematurely. The present invention first uses an aminosilane coupling agent to treat the basalt fiber, introduces amino groups on the surface of the basalt fiber, and then reacts with acyl chloride through the amino group to graft oleoyl chloride on the basalt fiber. Oleoyl chloride can enhance the water resistance of the gypsum board and prevent moisture penetration, thereby improving the service life of the gypsum board. At the same time, the alkyl long chain structure of oleoyl chloride can give the gypsum board a certain elasticity, so that it can better disperse stress when subjected to stress, reduce stress concentration, thereby improving the mechanical properties of the gypsum board. In addition, oleoyl chloride can also be used as a foaming agent.

[0019] Preferably, in the technical solution disclosed in the present invention, the starch can be selected to be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0020] Starch acts as a binder between the core and facing paper during the production process of gypsum board. It can migrate to the interface between the core and facing paper along with water vapor, playing a bonding role, thereby improving the strength of the gypsum board.

[0021] Preferably, in the technical solution disclosed in the present invention, the modified styrene-butadiene latex emulsion can be selected to be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0022] Specifically, the preparation method of the modified styrene butadiene latex emulsion is as follows: sodium dodecyl sulfate and tert-dodecyl mercaptan are added to deionized water, stirred evenly, nitrogen is introduced to expel the air, butadiene, styrene and 10-undecene-1-ol are added thereto, stirred evenly, then an initiator is added, heated and stirred to react, after the reaction is completed, the pH of the solution is adjusted to 7-8, and then degassed to obtain the modified styrene butadiene latex emulsion.

[0023] More specifically, the mass ratio of sodium dodecyl sulfate, tert-dodecyl mercaptan, deionized water, butadiene, styrene, 10-undecene-1-ol and initiator is 2-4: 1-2: 100: 10-15: 20-25: 10-15: 0.5-1.

[0024] Wherein, the initiator is selected from persulfate, for example, potassium persulfate, sodium persulfate or ammonium persulfate.

[0025] More specifically, the temperature of the heating and stirring reaction is 50-60°C, for example, 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, and 60°C can be selected; the time of the heating and stirring reaction is 2-5h, for example, 2h, 2.5h, 3h, 3.5h, 4h, 4.5h, and 5h can be selected, but it is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0026] The invention adds 10-undecene-1-ol into the styrene butadiene latex emulsion, so that the styrene butadiene emulsion has good water resistance after film formation, and the styrene butadiene emulsion also has good elasticity after film formation, thereby improving the water resistance and mechanical properties of the gypsum board.

[0027] Preferably, in the technical solution disclosed in the present invention, the water reducer can be selected from 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, and 2 parts, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0028] Specifically, the water reducer is selected from polycarboxylate water reducer or benzene sulfonate water reducer.

[0029] In the technical solution disclosed in the present invention, the retarder can be selected to be 0.2 parts, 0.3 parts, 0.4 parts, and 0.5 parts, but is not limited to the listed values, and other values ​​not listed within the numerical range are also applicable.

[0030] Specifically, the retarder is selected from one or more of sodium hexametaphosphate, sodium polyphosphate, citric acid, and sodium citrate.

[0031] Preferably, in the technical solution disclosed in the present invention, the water content can be 40 parts, 42 parts, 45 parts, 48 ​​parts, 50 parts, 52 parts, 55 parts, 58 parts, or 60 parts, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0032] The present invention also provides a preparation process of the above-mentioned water-resistant and moisture-proof paper-faced gypsum board, comprising the following steps: uniformly mixing gypsum clinker, modified basalt fiber and water according to weight parts, then adding starch and modified styrene-butadiene latex emulsion, first mechanically mixing uniformly and then ultrasonically dispersing, then adding a water reducer and a retarder, and mixing uniformly to obtain a mixed slurry; continuously pouring the mixed slurry between two layers of facing paper, hot-pressing and forming, and then drying, cutting and sawing to obtain the water-resistant and moisture-proof paper-faced gypsum board.

[0033] Compared with the prior art, the present invention has the following beneficial effects: (1) The gypsum board prepared by the present invention has excellent water and moisture resistance and good mechanical properties, which is superior to similar products on the market and has good market prospects.

[0034] (2) The present invention first uses an aminosilane coupling agent to treat basalt fiber, introduces amino groups on the surface of the basalt fiber, and then grafts oleoyl chloride onto the basalt fiber through the reaction of the amino group with acyl chloride. The oleoyl chloride can enhance the water resistance of the gypsum board and prevent moisture penetration, thereby increasing the service life of the gypsum board. At the same time, the alkyl long chain structure of oleoyl chloride can give the gypsum board a certain elasticity, so that it can better disperse stress when subjected to stress and reduce stress concentration, thereby improving the mechanical properties of the gypsum board.

[0035] (3) The present invention adds 10-undecene-1-ol to the styrene butadiene latex emulsion, so that the styrene butadiene latex has good water resistance after film formation, and the styrene butadiene latex also has good elasticity after film formation, thereby improving the water resistance and mechanical properties of the gypsum board.

[0036] (4) The present invention makes up for the defect of insufficient mechanical properties of the board when starch alone is used as a bonding material by adding modified basalt fiber and modified styrene-butadiene latex emulsion into the gypsum board core formula, so that the bonding between fibers, between gypsum materials, and between gypsum materials and fibers is more firm and tougher; at the same time, the modified styrene-butadiene latex emulsion contains an initiator persulfate, and the modified basalt fiber contains double bond groups. During the hot pressing process, addition reactions occur between the double bonds, thereby increasing the crosslinking density, making the board more dense, and further enhancing its water and moisture resistance. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below through specific preferred embodiments. Those skilled in the art will appreciate that the description is exemplary and the present invention is not limited to the following embodiments.

[0038] It should be noted that, unless otherwise specified, the chemical reagents involved in the present invention were purchased through commercial channels.

[0039] In the embodiment provided by the present invention, the preparation method of gypsum clinker is as follows: the desulfurized gypsum is first quickly dried at a high temperature of 150°C until 50% of the crystal water is removed, and then slowly calcined at a temperature of 140°C until all the crystal water to be removed is removed, thereby obtaining gypsum clinker.

[0040] The basalt fiber used in the embodiment of the present invention has a length of 5-10 mm and is purchased from Tai'an Haili New Materials Co., Ltd.; the starch is cassava starch purchased from Shandong World Chemical Co., Ltd.; and the polycarboxylate water reducer is purchased from Jinan Sunny Chemical Technology Co., Ltd.

[0041] Example 1 A preparation process of a water-resistant and moisture-proof gypsum board comprises the following steps: 100 parts of gypsum clinker, 10 parts of modified basalt fiber and 50 parts of water are mixed evenly, and then 8 parts of starch and 10 parts of modified styrene-butadiene latex are added, first mechanically mixed evenly and then ultrasonically dispersed, and then 1 part of polycarboxylic acid water reducer and 0.5 part of retarder sodium hexametaphosphate are added, and mixed evenly to obtain a mixed slurry; the mixed slurry is continuously poured between two layers of facing paper, hot-pressed at a temperature of 180°C and a pressure of 20MPa, and then dried, cut and sawed to obtain the water-resistant and moisture-proof paper-faced gypsum board, and the thickness of the gypsum board is 9.5mm.

[0042] Wherein, the preparation method of the modified basalt fiber is as follows: S1, dispersing 10 g of basalt fiber in 150 mL of 80 wt% ethanol aqueous solution, then adding 2 g of γ-aminopropyltriethoxysilane thereto, stirring for 3 h, then filtering, washing, and drying to obtain amino-modified basalt fiber; S2. Disperse 10 g of amino-modified basalt fiber in 150 mL of organic solvent carbon tetrachloride, then add 3 g of oleoyl chloride and 5 g of triethylamine, and heat the mixture under a nitrogen atmosphere at a temperature of 50° C. for 5 h. After the reaction is completed, filter, wash, and dry to obtain modified basalt fiber.

[0043] The preparation method of the modified styrene butadiene latex emulsion is as follows: 2g of sodium dodecyl sulfate and 1g of tert-dodecyl mercaptan are added to 100g of deionized water, stirred evenly, nitrogen is introduced to expel air, and then 10g of butadiene, 20g of styrene and 10g of 10-undecene-1-ol are added thereto, stirred evenly, and then 0.5g of initiator ammonium persulfate is added, and the mixture is heated and stirred at 50°C for reaction for 5h. After the reaction is completed, the pH of the solution is adjusted to 7, and then degassed to obtain the modified styrene butadiene latex emulsion.

[0044] Example 2 A preparation process of a water-resistant and moisture-proof gypsum board comprises the following steps: 100 parts of gypsum clinker, 15 parts of modified basalt fiber and 60 parts of water are mixed evenly, and then 10 parts of starch and 5 parts of modified styrene-butadiene latex are added, first mechanically mixed evenly and then ultrasonically dispersed, and then 2 parts of polycarboxylic acid water reducer and 0.5 parts of retarder sodium hexametaphosphate are added, and mixed evenly to obtain a mixed slurry; the mixed slurry is continuously poured between two layers of facing paper, hot-pressed at a temperature of 180°C and a pressure of 20MPa, and then dried, cut and sawed to obtain the water-resistant and moisture-proof paper-faced gypsum board, and the thickness of the gypsum board is 9.5mm.

[0045] Wherein, the preparation method of the modified basalt fiber is as follows: S1, dispersing 15g of basalt fiber in 150mL of 80wt% ethanol aqueous solution, then adding 5g of γ-aminopropyltriethoxysilane thereto, stirring for 3h, then filtering, washing and drying to obtain amino-modified basalt fiber; S2. Disperse 20 g of amino-modified basalt fiber in 150 mL of organic solvent carbon tetrachloride, then add 6 g of oleoyl chloride and 10 g of triethylamine, and heat the mixture under a nitrogen atmosphere at a temperature of 70° C. for 3 h. After the reaction is completed, filter, wash, and dry to obtain modified basalt fiber.

[0046] The preparation method of the modified styrene butadiene latex emulsion is as follows: 4g of sodium dodecyl sulfate and 2g of tert-dodecyl mercaptan are added to 100g of deionized water, stirred evenly, nitrogen is introduced to expel the air, and then 15g of butadiene, 25g of styrene and 15g of 10-undecene-1-ol are added thereto, stirred evenly, and then 1g of initiator ammonium persulfate is added, and the mixture is heated and stirred at 60°C for reaction for 2h. After the reaction is completed, the pH of the solution is adjusted to 7, and then degassed to obtain the modified styrene butadiene latex emulsion.

[0047] Example 3 A preparation process of a water-resistant and moisture-proof gypsum board comprises the following steps: 100 parts of gypsum clinker, 12 parts of modified basalt fiber and 40 parts of water are mixed evenly, and then 5 parts of starch and 10 parts of modified styrene-butadiene latex are added, first mechanically mixed evenly and then ultrasonically dispersed, and then 1.5 parts of polycarboxylic acid water reducer and 0.2 parts of retarder sodium hexametaphosphate are added, and mixed evenly to obtain a mixed slurry; the mixed slurry is continuously poured between two layers of facing paper, hot-pressed at a temperature of 180°C and a pressure of 20MPa, and then dried, cut and sawed to obtain the water-resistant and moisture-proof paper-faced gypsum board, and the thickness of the gypsum board is 9.5mm.

[0048] Wherein, the preparation method of the modified basalt fiber is as follows: S1, dispersing 12 g of basalt fiber in 150 mL of 80 wt% ethanol aqueous solution, then adding 3 g of γ-aminopropyltriethoxysilane thereto, stirring for 3 h, then filtering, washing, and drying to obtain amino-modified basalt fiber; S2. Disperse 15 g of amino-modified basalt fiber in 150 mL of organic solvent carbon tetrachloride, then add 5 g of oleoyl chloride and 8 g of triethylamine, and heat the mixture under a nitrogen atmosphere at a temperature of 60° C. for 4 h. After the reaction is completed, filter, wash, and dry to obtain modified basalt fiber.

[0049] The preparation method of the modified styrene butadiene latex emulsion is as follows: 4g of sodium dodecyl sulfate and 2g of tert-dodecyl mercaptan are added to 100g of deionized water, stirred evenly, nitrogen is introduced to exhaust the air, and then 12g of butadiene, 24g of styrene and 12g of 10-undecene-1-ol are added thereto, stirred evenly, and then 1g of initiator ammonium persulfate is added, and the reaction is heated and stirred at 55°C for 3h. After the reaction is completed, the pH of the solution is adjusted to 7, and then degassed to obtain the modified styrene butadiene latex emulsion.

[0050] Comparative Example 1 A preparation process of a water-resistant and moisture-proof gypsum board comprises the following steps: 100 parts of gypsum clinker, 12 parts of basalt fiber and 40 parts of water are mixed evenly, and then 5 parts of starch and 10 parts of styrene-butadiene latex are added, first mechanically mixed evenly and then ultrasonically dispersed, and then 1.5 parts of polycarboxylic acid water reducer and 0.2 parts of retarder sodium hexametaphosphate are added, and mixed evenly to obtain a mixed slurry; the mixed slurry is continuously poured between two layers of facing paper, hot-pressed at a temperature of 180°C and a pressure of 20MPa, and then dried, cut and sawed to obtain the water-resistant and moisture-proof paper-faced gypsum board, and the thickness of the gypsum board is 9.5mm.

[0051] Compared with Example 3, Comparative Example 1 did not perform modification treatment on the basalt fiber and the styrene-butadiene latex emulsion.

[0052] Comparative Example 2 A preparation process of a water-resistant and moisture-proof gypsum board comprises the following steps: 100 parts of gypsum clinker, 12 parts of basalt fiber and 40 parts of water are mixed evenly, and then 5 parts of starch and 10 parts of modified styrene-butadiene latex are added, first mechanically mixed evenly and then ultrasonically dispersed, and then 1.5 parts of polycarboxylic acid water reducer and 0.2 parts of retarder sodium hexametaphosphate are added, and mixed evenly to obtain a mixed slurry; the mixed slurry is continuously poured between two layers of facing paper, hot-pressed at a temperature of 180°C and a pressure of 20MPa, and then dried, cut and sawed to obtain the water-resistant and moisture-proof paper-faced gypsum board, and the thickness of the gypsum board is 9.5mm.

[0053] The preparation method of the modified styrene butadiene latex emulsion is as follows: 4g of sodium dodecyl sulfate and 2g of tert-dodecyl mercaptan are added to 100g of deionized water, stirred evenly, nitrogen is introduced to expel the air, and then 12g of butadiene, 24g of styrene and 12g of 10-undecene-1-ol are added thereto, stirred evenly, and then 1g of initiator ammonium persulfate is added, and the reaction is heated and stirred at 55°C for 3h. After the reaction is completed, the pH of the solution is adjusted to 7, and then degassed to obtain the modified styrene butadiene latex emulsion.

[0054] Compared with Example 3, Comparative Example 2 did not perform modification treatment on the basalt fiber.

[0055] Comparative Example 3 A preparation process of a water-resistant and moisture-proof gypsum board comprises the following steps: 100 parts of gypsum clinker, 12 parts of modified basalt fiber and 40 parts of water are mixed evenly, and then 5 parts of starch and 10 parts of styrene-butadiene latex are added, first mechanically mixed evenly and then ultrasonically dispersed, and then 1.5 parts of polycarboxylic acid water reducer and 0.2 parts of retarder sodium hexametaphosphate are added, and mixed evenly to obtain a mixed slurry; the mixed slurry is continuously poured between two layers of facing paper, hot-pressed at a temperature of 180°C and a pressure of 20MPa, and then dried, cut and sawed to obtain the water-resistant and moisture-proof paper-faced gypsum board, and the thickness of the gypsum board is 9.5mm.

[0056] Wherein, the preparation method of the modified basalt fiber is as follows: S1, dispersing 12 g of basalt fiber in 150 mL of 80 wt% ethanol aqueous solution, then adding 3 g of γ-aminopropyltriethoxysilane thereto, stirring for 3 h, then filtering, washing, and drying to obtain amino-modified basalt fiber; S2. Disperse 15 g of amino-modified basalt fiber in 150 mL of organic solvent carbon tetrachloride, then add 5 g of oleoyl chloride and 8 g of triethylamine, and heat the mixture under a nitrogen atmosphere at a temperature of 60° C. for 4 h. After the reaction is completed, filter, wash, and dry to obtain modified basalt fiber.

[0057] The preparation method of the styrene butadiene latex emulsion is as follows: 4g of sodium dodecyl sulfate and 2g of tert-dodecyl mercaptan are added to 100g of deionized water, stirred evenly, nitrogen is introduced to expel the air, and then 12g of butadiene and 24g of styrene are added thereto, stirred evenly, and then 1g of initiator ammonium persulfate is added, and the reaction is heated and stirred at 55°C for 3h. After the reaction is completed, the pH of the solution is adjusted to 7, and then degassed to obtain the styrene butadiene latex emulsion.

[0058] Compared with Example 3, Comparative Example 3 did not add 10-undecene-1-ol to the styrene-butadiene latex emulsion.

[0059] The mechanical properties and water resistance of the 9.5 mm thick gypsum boards prepared in the above embodiments and comparative examples were tested according to the national standard GB / T 9775-2008. The test results are shown in Table 1.

[0060] Table 1 Performance test results of gypsum board

[0061] It can be seen from the table that the tensile mechanical properties and water and moisture resistance of the gypsum board can be improved by modifying the basalt fiber and styrene-butadiene latex.

[0062] Finally, it should be noted that, although the present invention has been described in detail with reference to specific embodiments, the above embodiments do not limit the present invention in any form. For those skilled in the art, some modifications and improvements can be made to the present invention on the basis of the present invention. Any modification or improvement made without departing from the purpose and spirit of the present invention falls within the scope of the present invention, and the protection scope of the present invention is defined by the attached claims.

Claims

1. A water-resistant and moisture-proof paper-faced gypsum board, comprising two layers of facing paper and a gypsum board core between the two layers of facing paper, characterized in that: The raw materials of the gypsum board core are composed of the following components by weight: 100 parts of gypsum clinker, 10-15 parts of modified basalt fiber, 5-10 parts of starch, 5-10 parts of modified styrene-butadiene latex emulsion, 1-2 parts of water reducer, 0.2-0.5 parts of retarder, and 40-60 parts of water.

2. The water-resistant and moisture-proof gypsum board according to claim 1, characterized in that: The preparation method of the modified basalt fiber is as follows: S1, dispersing basalt fiber in ethanol aqueous solution, then adding aminosilane coupling agent thereto, stirring, then filtering, washing and drying to obtain amino-modified basalt fiber; S2, dispersing the amino-modified basalt fiber in an organic solvent, then adding oleoyl chloride and triethylamine thereto, heating and reacting under a nitrogen atmosphere, and after the reaction is completed, filtering, washing and drying to obtain the modified basalt fiber.

3. The water-resistant and moisture-proof gypsum board according to claim 2, characterized in that: In step S1, the mass ratio of the basalt fiber to the aminosilane coupling agent is 10-15:2-5.

4. The water-resistant and moisture-proof gypsum board according to claim 2, characterized in that: In step S2, the mass ratio of the amino-modified basalt fiber, oleoyl chloride and triethylamine is 10-20:3-6:5-10.

5. The water-resistant and moisture-proof gypsum board according to claim 2, characterized in that: In step S2, the heating reaction temperature is 50-70°C, and the heating reaction time is 3-5h.

6. The water-resistant and moisture-proof gypsum board according to claim 2, characterized in that: The preparation method of the modified styrene butadiene latex emulsion is as follows: sodium dodecyl sulfate and tert-dodecyl mercaptan are added to deionized water, stirred evenly, nitrogen is introduced to expel air, butadiene, styrene and 10-undecene-1-ol are added thereto, stirred evenly, an initiator is subsequently added, heated and stirred for reaction, after the reaction is completed, the pH of the solution is adjusted to 7-8, and then degassed to obtain the modified styrene butadiene latex emulsion.

7. The water-resistant and moisture-proof gypsum board according to claim 6, characterized in that: The mass ratio of sodium dodecyl sulfate, tert-dodecyl mercaptan, deionized water, butadiene, styrene, 10-undecene-1-ol and initiator is 2-4:1-2:100:10-15:20-25:10-15:0.5-1.

8. The water-resistant and moisture-proof gypsum board according to claim 6, characterized in that: The temperature of the heating and stirring reaction is 50-60°C, and the time of the heating and stirring reaction is 2-5h.

9. The water-resistant and moisture-proof gypsum board according to claim 1, characterized in that: The water reducer is selected from polycarboxylate water reducer or benzenesulfonate water reducer, and the retarder is selected from one or more of sodium hexametaphosphate, sodium polyphosphate, citric acid, and sodium citrate.

10. The process for preparing the water-resistant and moisture-proof gypsum board according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: uniformly mixing gypsum clinker, modified basalt fiber and water according to parts by weight, then adding starch and modified styrene-butadiene latex emulsion, firstly mechanically mixing uniformly and then ultrasonically dispersing, then adding a water reducer and a retarder, and mixing uniformly to obtain a mixed slurry; continuously pouring the mixed slurry between two layers of facing paper, hot pressing to form, and then drying, cutting and sawing to obtain the water-resistant and moisture-proof paper-faced gypsum board.

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