A high-strength, impact-resistant paper-faced gypsum board and its preparation method

Abstract

This invention relates to the field of building materials technology, specifically to a high-strength, impact-resistant paper-faced gypsum board and its preparation method. The preparation of the paper-faced gypsum board includes the following steps: Step 1: Dissolving a foaming agent and a gelling material in deionized water, stirring and dispersing to obtain raw material A; mixing gypsum, starch, and a water-reducing agent evenly to obtain raw material B; adding raw material B to raw material A and mixing evenly to obtain a gypsum core layer material; Step 2: Under a mold, pouring the gypsum core layer material onto impregnated base paper, and then covering its surface with impregnated face paper, drying to obtain the paper-faced gypsum board. This invention uses modified zeolite, coconut oil fatty acid diethanolamide, and compound A to prepare a foaming agent, which has a good foaming effect and enhances the strength of the paper-faced gypsum board.

Description

Technical Field

[0001] This invention relates to the field of building materials technology, specifically to a high-strength, impact-resistant paper-faced gypsum board and its preparation method. Background Technology

[0002] Gypsum is a widely used building material. It is mainly divided into natural gypsum and industrial by-product gypsum. Natural gypsum, also known as raw gypsum, is primarily composed of calcium sulfate. After calcination, it becomes gypsum, also called building gypsum. Paper-faced gypsum is a building material made primarily from building gypsum. It is produced by combining calcined gypsum with additives such as starch, water-reducing agents, and fiber materials to form a core, which is then covered with a special paperboard. Paper-faced gypsum is thinner, lighter, stronger, and easier to process. It allows for the reuse of desulfurized gypsum and is an energy-saving, environmentally friendly, sound-insulating, heat-insulating, and fire-resistant green building material. However, traditional paper-faced gypsum boards are relatively thin. If the center of the board is impacted, it is prone to breakage, damaging the board and affecting its lifespan.

[0003] To address the aforementioned problems and improve the strength of paper-faced gypsum board, this invention provides a high-strength, impact-resistant paper-faced gypsum board and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength, impact-resistant paper-faced gypsum board and its preparation method, so as to solve the problems mentioned in the background art.

[0005] A method for preparing high-strength, impact-resistant paper-faced gypsum board includes the following steps:

[0006] Step 1: Dissolve the foaming agent and gelling material in deionized water and stir to disperse to obtain raw material A; mix gypsum, starch and water-reducing agent evenly to obtain raw material B; add raw material B to raw material A and mix evenly to obtain gypsum core material;

[0007] Step 2: Place the face paper and backing paper separately in the impregnation solution and impregnate them at 25-27℃ for 30-40 minutes to obtain the treated face paper and the treated backing paper.

[0008] Step 3: Under the mold, pour the gypsum core material onto the treated base paper, and then cover the surface with the treated face paper. After drying, you will get a paper-faced gypsum board.

[0009] In a more optimized manner, the gypsum core material comprises the following components by weight: 100 parts gypsum, 3-6 parts starch, 8-12 parts gelling material, 0.05-0.1 parts foaming agent, 55-60 parts deionized water, and 0.05-0.2 parts water-reducing agent.

[0010] A more optimized method for preparing the foaming agent is as follows: take modified zeolite, coconut oil fatty acid diethanolamide, and compound A, mix them evenly to obtain the foaming agent.

[0011] A more optimized method for preparing compound A is as follows: polyacrylic acid, butyl acetate, vinylmethyl diethoxysilane, and tert-butyl peroxide are mixed evenly and reacted at 110-115℃ for 6-7 hours to obtain compound A.

[0012] In a more optimized manner, the mass ratio of the modified zeolite, coconut oil fatty acid diethanolamide, and compound A is 1.5:(2-2.5):(2.5-3).

[0013] A more optimized method for preparing the gel material is as follows: dissolve polyvinyl alcohol in water to obtain a polyvinyl alcohol solution; place glass fiber in sodium hydroxide solution for alkalization treatment, add hydrogen peroxide solution, treat for 1-2 hours, wash and dry, transfer it to the polyvinyl alcohol solution, add glyoxal, stir evenly, use hydrochloric acid solution to control pH = 3.2-3.5, react for 8-10 hours, wash and freeze-dry to obtain the gel material.

[0014] A more optimized method for preparing the modified zeolite is as follows: take zeolite and nitric acid solution, stir at 50-60℃ for 10-12h, centrifuge and dry, add toluene solution, stir evenly, add aminopropyltrimethoxysilane coupling agent, react at 50-60℃ for 10-14h, wash and dry to obtain modified zeolite.

[0015] In a more optimized manner, in step two, the impregnation solution is prepared by ultrasonically dispersing nano-silica in ethanol, adding tetraethyl silicate, hydroxyl-terminated polydimethylsiloxane, and dibutyltin dichloride, and stirring until homogeneous to obtain the impregnation solution.

[0016] Ideally, the glass fiber has a length of 1-2 mm and a diameter of 5-30 μm.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0018] (1) Nitric acid was used to preliminarily modify the zeolite, increasing its specific surface area. Then, 3-aminopropyltrimethoxysilane coupling agent was used to modify the zeolite, so that amino groups were loaded on the zeolite, which also enhanced the hydrophilicity of the zeolite.

[0019] This invention uses polyacrylic acid, which has good hydrophilicity, as the main component of compound A, and adds coconut oil fatty acid diethanolamide and modified zeolite to prepare a foaming agent. Because the hydrophilicity is improved after zeolite modification, the modified zeolite can be uniformly dispersed in the foaming agent system. The amino groups on the modified zeolite can react with the silanol groups in the impregnation solution, strengthening the interfacial force between the gypsum core layer and the paper panel, thereby increasing the mechanical properties of the paper-faced gypsum board.

[0020] (2) This invention uses modified zeolite, coconut oil fatty acid diethanolamide, and compound A to prepare a foaming agent. Modified zeolite has a large specific surface area, allowing it to adsorb more carbon dioxide and release it upon heating, resulting in a relatively stable bubble generation rate and thus a foaming effect. Coconut oil fatty acid diethanolamide is a small molecule, and small molecules in foaming agents have a fast movement rate, increasing the fluidity of the foaming agent. This invention also adds compound A. Polyacrylic acid, butyl acetate, vinylmethyl diethoxysilane, and tert-butyl peroxide are mixed evenly and reacted at 110-115℃ for 6-7 hours to obtain compound A. Compound A is a macromolecule synthesized from vinylmethyl diethoxysilane and polyacrylic acid, which can improve foam density and enhance the mechanical properties of gypsum board. The optimal foaming effect and strength of the gypsum board are achieved when the mass ratio of modified zeolite, coconut oil fatty acid diethanolamide, and compound A is 1.5:(2-2.5):(2.5-3). Since this foaming agent is a surfactant, it can help enhance the dispersibility of gel materials and suppress the random flying of gel materials. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] There are no special restrictions on the suppliers of any of the raw materials involved in this invention. Exemplary examples include: coconut oil fatty acid diethanolamide: catalog number: Y18593, molecular weight: 530.87, provided by Beijing Bio-Laibo Technology Co., Ltd.; polyacrylic acid: CAS number: 9003-01-4, product number: 1443394, molecular weight: 2000-5000, provided by Leyan Reagent; vinylmethyl diethoxysilane: CAS number: 5507-44-8, molecular weight: 160.29, provided by Hubei Qifei Pharmaceutical Chemical Co., Ltd.; zeolite: zeolite particle size 1-20μm; polyvinyl alcohol: catalog number: S30196, provided by Shanghai Yuanye; Glass fiber: 1-2mm in length, 5-30μm in diameter; Gypsum clinker: 200-mesh calcined gypsum, from Hebei Runri Mineral Products Co., Ltd.; Aminopropyltrimethoxysilane coupling agent: available from Hubei Wuda Organosilicon New Materials Co., Ltd.; Nano silica: 20nm particle size, available from Maclean; Hydroxyl-terminated polydimethylsiloxane: available from Shanghai Tengzhun Biotechnology Co., Ltd.; Tetraethyl silicate: available from Aladdin; Dibutyltin dichloride: available from Wuhan Kanos Technology Co., Ltd.; Water-reducing agent: Polycarboxylate water-reducing agent: available from Hubei Shiteng Chemical Technology Co., Ltd.

[0023] Example 1: A method for preparing high-strength, impact-resistant paper-faced gypsum board, comprising the following steps:

[0024] Step 1: Preparation of foaming agent:

[0025] Take 35 parts of polyacrylic acid, 2 parts of butyl acetate, 3 parts of vinylmethyldiethoxysilane, and 1 part of tert-butyl peroxide, mix them evenly, and react them at 112℃ for 6.5 h to obtain compound A;

[0026] Take 3 parts of zeolite and 100 mL of 8 M nitric acid solution, stir at 55 °C for 11 h, centrifuge and dry, add 50 parts of toluene solution, stir evenly, add 1.5 parts of aminopropyltrimethoxysilane coupling agent, react at 55 °C for 12 h, wash and dry to obtain modified zeolite.

[0027] Take 1.5 parts of modified zeolite, 2.2 parts of coconut oil fatty acid diethanolamide, and 2.8 parts of compound A, mix them evenly to obtain a foaming agent;

[0028] The mass ratio of the modified zeolite, coconut oil fatty acid diethanolamide, and compound A is 1.5:2.2:2.8.

[0029] Step 2: Preparation of gel material:

[0030] 36 parts of polyvinyl alcohol were dissolved in water to obtain a 4 wt% polyvinyl alcohol solution for later use; 20 parts of glass fiber were placed in a 5 wt% sodium hydroxide solution and alkalized at 80°C for 5 hours; the temperature was lowered to 50°C and 18 wt% hydrogen peroxide solution was added, and the pH was adjusted to 11.5 using sodium hydroxide for hydrophilic treatment for 1.5 hours, followed by washing and drying; the fiber was transferred to a polyvinyl alcohol solution, 2 parts of glyoxal were added, and the mixture was stirred evenly. The pH was controlled at 3.3 using hydrochloric acid solution, and the mixture was reacted at a stirring speed of 1000 rpm and a temperature of 88°C for 9 hours. The mixture was then washed and freeze-dried to obtain a gel material.

[0031] Step 3: Preparation of gypsum core layer material:

[0032] The gel material and foaming agent are dissolved in deionized water and stirred to disperse, thus obtaining raw material A; gypsum, starch, and water-reducing agent are mixed evenly to obtain raw material B; raw material B is added to raw material A and mixed evenly to obtain gypsum core material.

[0033] The gypsum core material comprises the following components by weight: 100 parts gypsum, 5 parts starch, 10 parts gelling material, 0.07 parts foaming agent, 57 parts deionized water, and 0.1 parts water-reducing agent.

[0034] Step 4: Preparation of paper-faced gypsum board:

[0035] 0.5 parts of nano-silica were ultrasonically dispersed in ethanol to obtain an 8 wt% suspension; 0.3 parts of tetraethyl silicate, 1.5 parts of hydroxyl-terminated polydimethylsiloxane, and 0.05 parts of dibutyltin dichloride were added and stirred evenly to obtain an impregnation solution.

[0036] The face paper and the backing paper were placed in the impregnation solution and impregnated at 26°C for 35 minutes to obtain the treated face paper and the treated backing paper.

[0037] Under the mold, the gypsum core layer material is poured onto the treated base paper. The thickness of the gypsum core layer material is 12mm. Then, the treated face paper is laid on its surface and dried to obtain paper-faced gypsum board.

[0038] The mass per unit volume of the face paper is 210 g / m³. 2 The base paper has a unit area mass of 190 g / m². 2 .

[0039] Example 2: A method for preparing high-strength, impact-resistant paper-faced gypsum board, comprising the following steps:

[0040] Step 1: Preparation of foaming agent:

[0041] Take 35 parts of polyacrylic acid, 2 parts of butyl acetate, 3 parts of vinylmethyldiethoxysilane, and 1 part of tert-butyl peroxide, mix them evenly, and react them at 110℃ for 6 hours to obtain compound A;

[0042] Take 3 parts of zeolite and 100 mL of 8 M nitric acid solution, stir at 50 °C for 10 h, centrifuge and dry, add 50 parts of toluene solution, stir evenly, add 1.5 parts of aminopropyltrimethoxysilane coupling agent, react at 50 °C for 10 h, wash and dry to obtain modified zeolite.

[0043] Take 1.5 parts of modified zeolite, 2 parts of coconut oil fatty acid diethanolamide, and 2.5 parts of compound A, mix them evenly to obtain a foaming agent;

[0044] The mass ratio of the modified zeolite, coconut oil fatty acid diethanolamide, and compound A is 1.5:2:2.5.

[0045] Step 2: Preparation of gel material:

[0046] 36 parts of polyvinyl alcohol were dissolved in water to obtain a 4 wt% polyvinyl alcohol solution for later use; 20 parts of glass fiber were placed in a 5 wt% sodium hydroxide solution and alkalized at 80°C for 5 hours; the temperature was lowered to 50°C and 18 wt% hydrogen peroxide solution was added, and the pH was adjusted to 11.5 using sodium hydroxide for hydrophilic treatment for 1.5 hours, followed by washing and drying; the fiber was transferred to a polyvinyl alcohol solution, 2 parts of glyoxal were added, and the mixture was stirred evenly. The pH was controlled at 3.2 using hydrochloric acid solution, and the mixture was reacted at a stirring speed of 900 rpm and a temperature of 85°C for 8 hours. The mixture was then washed and freeze-dried to obtain a gel material.

[0047] Step 3: Preparation of gypsum core layer material:

[0048] The gel material and foaming agent are dissolved in deionized water and stirred to disperse, thus obtaining raw material A; gypsum, starch, and water-reducing agent are mixed evenly to obtain raw material B; raw material B is added to raw material A and mixed evenly to obtain gypsum core material.

[0049] The gypsum core material comprises the following components by weight: 100 parts gypsum, 3 parts starch, 8 parts gelling material, 0.05 parts foaming agent, 55 parts deionized water, and 0.05 parts water-reducing agent.

[0050] Step 4: Preparation of paper-faced gypsum board:

[0051] 0.5 parts of nano-silica were ultrasonically dispersed in ethanol to obtain an 8 wt% suspension; 0.3 parts of tetraethyl silicate, 1.5 parts of hydroxyl-terminated polydimethylsiloxane, and 0.05 parts of dibutyltin dichloride were added and stirred evenly to obtain an impregnation solution.

[0052] The face paper and the backing paper were placed in the impregnation solution and impregnated at 25°C for 30 minutes to obtain the treated face paper and the treated backing paper.

[0053] Under the mold, the gypsum core layer material is poured onto the treated base paper. The thickness of the gypsum core layer material is 12mm. Then, the treated face paper is laid on its surface and dried to obtain paper-faced gypsum board.

[0054] The mass per unit volume of the face paper is 210 g / m³. 2 The base paper has a unit area mass of 190 g / m². 2 .

[0055] Example 3: A method for preparing high-strength, impact-resistant paper-faced gypsum board, comprising the following steps:

[0056] Step 1: Preparation of foaming agent:

[0057] Take 35 parts of polyacrylic acid, 2 parts of butyl acetate, 3 parts of vinylmethyldiethoxysilane, and 1 part of tert-butyl peroxide, mix them evenly, and react them at 115℃ for 7 hours to obtain compound A;

[0058] Take 3 parts of zeolite and 100 mL of 8 M nitric acid solution, stir at 60 °C for 12 h, centrifuge and dry, add 50 parts of toluene solution, stir evenly, add 1.5 parts of aminopropyltrimethoxysilane coupling agent, react at 60 °C for 14 h, wash and dry to obtain modified zeolite.

[0059] Take 1.5 parts of modified zeolite, 2.5 parts of coconut oil fatty acid diethanolamide, and 3 parts of compound A, mix them evenly to obtain a foaming agent;

[0060] The mass ratio of the modified zeolite, coconut oil fatty acid diethanolamide, and compound A is 1.5:2.5:3.

[0061] Step 2: Preparation of gel material:

[0062] 36 parts of polyvinyl alcohol were dissolved in water to obtain a 4 wt% polyvinyl alcohol solution for later use; 20 parts of glass fiber were placed in a 5 wt% sodium hydroxide solution and alkalized at 80°C for 5 hours; the temperature was lowered to 50°C and 18 wt% hydrogen peroxide solution was added, and the pH was adjusted to 11.5 using sodium hydroxide for hydrophilic treatment for 1.5 hours, followed by washing and drying; the fiber was transferred to a polyvinyl alcohol solution, 2 parts of glyoxal were added, and the mixture was stirred evenly. The pH was controlled at 3.5 using hydrochloric acid solution, and the mixture was reacted at a stirring speed of 1000 rpm and a temperature of 90°C for 10 hours. The fiber was then washed and freeze-dried to obtain a gel material.

[0063] Step 3: Preparation of gypsum core layer material:

[0064] The gel material and foaming agent are dissolved in deionized water and stirred to disperse, thus obtaining raw material A; gypsum, starch, and water-reducing agent are mixed evenly to obtain raw material B; raw material B is added to raw material A and mixed evenly to obtain gypsum core material.

[0065] The gypsum core material comprises the following components by weight: 100 parts gypsum, 6 parts starch, 12 parts gelling material, 0.1 parts foaming agent, 60 parts deionized water, and 0.2 parts water-reducing agent;

[0066] Step 4: Preparation of paper-faced gypsum board:

[0067] 0.5 parts of nano-silica were ultrasonically dispersed in ethanol to obtain an 8 wt% suspension; 0.3 parts of tetraethyl silicate, 1.5 parts of hydroxyl-terminated polydimethylsiloxane, and 0.05 parts of dibutyltin dichloride were added and stirred evenly to obtain an impregnation solution.

[0068] The face paper and the backing paper were placed in the impregnation solution and impregnated at 27°C for 40 minutes to obtain the treated face paper and the treated backing paper.

[0069] Under the mold, the gypsum core layer material is poured onto the treated base paper. The thickness of the gypsum core layer material is 12mm. Then, the treated face paper is laid on its surface and dried to obtain paper-faced gypsum board.

[0070] The mass per unit volume of the face paper is 210 g / m³. 2 The base paper has a unit area mass of 190 g / m². 2 .

[0071] Comparative Example 1: A method for preparing high-strength impact-resistant paper-faced gypsum board, reducing the amount of modified zeolite added, the rest being the same as Example 1;

[0072] Step 1: Preparation of foaming agent:

[0073] Take 35 parts of polyacrylic acid, 2 parts of butyl acetate, 3 parts of vinylmethyldiethoxysilane, and 1 part of tert-butyl peroxide, mix them evenly, and react them at 112℃ for 6.5 h to obtain compound A;

[0074] Take 3 parts of zeolite and 100 mL of 8 M nitric acid solution, stir at 55 °C for 11 h, centrifuge and dry, add 50 parts of toluene solution, stir evenly, add 1.5 parts of aminopropyltrimethoxysilane coupling agent, react at 55 °C for 12 h, wash and dry to obtain modified zeolite.

[0075] Take 1 part of modified zeolite, 2.2 parts of coconut oil fatty acid diethanolamide, and 2.8 parts of compound A, mix them evenly to obtain a foaming agent;

[0076] The mass ratio of the modified zeolite, coconut oil fatty acid diethanolamide, and compound A is 1:2.2:2.8.

[0077] Step 2: Preparation of gel material:

[0078] 36 parts of polyvinyl alcohol were dissolved in water to obtain a 4 wt% polyvinyl alcohol solution for later use; 20 parts of glass fiber were placed in a 5 wt% sodium hydroxide solution and alkalized at 80°C for 5 hours; the temperature was lowered to 50°C and 18 wt% hydrogen peroxide solution was added, and the pH was adjusted to 11.5 using sodium hydroxide for hydrophilic treatment for 1.5 hours, followed by washing and drying; the fiber was transferred to a polyvinyl alcohol solution, 2 parts of glyoxal were added, and the mixture was stirred evenly. The pH was controlled at 3.3 using hydrochloric acid solution, and the mixture was reacted at a stirring speed of 1000 rpm and a temperature of 88°C for 9 hours. The mixture was then washed and freeze-dried to obtain a gel material.

[0079] Step 3: Preparation of gypsum core layer material:

[0080] The gel material and foaming agent are dissolved in deionized water and stirred to disperse, thus obtaining raw material A; gypsum, starch, and water-reducing agent are mixed evenly to obtain raw material B; raw material B is added to raw material A and mixed evenly to obtain gypsum core material.

[0081] The gypsum core material comprises the following components by weight: 100 parts gypsum, 5 parts starch, 10 parts gelling material, 0.07 parts foaming agent, 57 parts deionized water, and 0.1 parts water-reducing agent.

[0082] Step 4: Preparation of paper-faced gypsum board:

[0083] 0.5 parts of nano-silica were ultrasonically dispersed in ethanol to obtain an 8 wt% suspension; 0.3 parts of tetraethyl silicate, 1.5 parts of hydroxyl-terminated polydimethylsiloxane, and 0.05 parts of dibutyltin dichloride were added and stirred evenly to obtain an impregnation solution.

[0084] The face paper and the backing paper were placed in the impregnation solution and impregnated at 26°C for 35 minutes to obtain the treated face paper and the treated backing paper.

[0085] Under the mold, the gypsum core layer material is poured onto the treated base paper. The thickness of the gypsum core layer material is 12mm. Then, the treated face paper is laid on its surface and dried to obtain paper-faced gypsum board.

[0086] The mass per unit volume of the face paper is 210 g / m³. 2 The base paper has a unit area mass of 190 g / m². 2 .

[0087] Comparative Example 2: A method for preparing high-strength impact-resistant paper-faced gypsum board, in which vinylmethyldiethoxysilane is used instead of compound A, and the rest is the same as in Example 1;

[0088] Step 1: Preparation of foaming agent:

[0089] Take 3 parts of zeolite and 100 mL of 8 M nitric acid solution, stir at 55 °C for 11 h, centrifuge and dry, add 50 parts of toluene solution, stir evenly, add 1.5 parts of aminopropyltrimethoxysilane coupling agent, react at 55 °C for 12 h, wash and dry to obtain modified zeolite.

[0090] Take 1.5 parts of modified zeolite, 2.2 parts of coconut oil fatty acid diethanolamide, and 2.8 parts of vinylmethyl diethoxysilane, mix them evenly to obtain a foaming agent;

[0091] The mass ratio of the modified zeolite, coconut oil fatty acid diethanolamide, and vinylmethyl diethoxysilane is 1.5:2.2:2.8.

[0092] Step 2: Preparation of gel material:

[0093] 36 parts of polyvinyl alcohol were dissolved in water to obtain a 4 wt% polyvinyl alcohol solution for later use; 20 parts of glass fiber were placed in a 5 wt% sodium hydroxide solution and alkalized at 80°C for 5 hours; the temperature was lowered to 50°C and 18 wt% hydrogen peroxide solution was added, and the pH was adjusted to 11.5 using sodium hydroxide for hydrophilic treatment for 1.5 hours, followed by washing and drying; the fiber was transferred to a polyvinyl alcohol solution, 2 parts of glyoxal were added, and the mixture was stirred evenly. The pH was controlled at 3.3 using hydrochloric acid solution, and the mixture was reacted at a stirring speed of 1000 rpm and a temperature of 88°C for 9 hours. The mixture was then washed and freeze-dried to obtain a gel material.

[0094] Step 3: Preparation of gypsum core layer material:

[0095] The gel material and foaming agent are dissolved in deionized water and stirred to disperse, thus obtaining raw material A; gypsum, starch, and water-reducing agent are mixed evenly to obtain raw material B; raw material B is added to raw material A and mixed evenly to obtain gypsum core material.

[0096] The gypsum core material comprises the following components by weight: 100 parts gypsum, 5 parts starch, 10 parts gelling material, 0.07 parts foaming agent, 57 parts deionized water, and 0.1 parts water-reducing agent.

[0097] Step 4: Preparation of paper-faced gypsum board:

[0098] 0.5 parts of nano-silica were ultrasonically dispersed in ethanol to obtain an 8 wt% suspension; 0.3 parts of tetraethyl silicate, 1.5 parts of hydroxyl-terminated polydimethylsiloxane, and 0.05 parts of dibutyltin dichloride were added and stirred evenly to obtain an impregnation solution.

[0099] The face paper and the backing paper were placed in the impregnation solution and impregnated at 26°C for 35 minutes to obtain the treated face paper and the treated backing paper.

[0100] Under the mold, the gypsum core layer material is poured onto the treated base paper. The thickness of the gypsum core layer material is 12mm. Then, the treated face paper is laid on its surface and dried to obtain paper-faced gypsum board.

[0101] The mass per unit volume of the face paper is 210 g / m³. 2 The base paper has a unit area mass of 190 g / m². 2 .

[0102] Comparative Example 3: A method for preparing high-strength impact-resistant paper-faced gypsum board, using zeolite instead of modified zeolite, the rest being the same as in Example 1;

[0103] Step 1: Preparation of foaming agent:

[0104] Take 35 parts of polyacrylic acid, 2 parts of butyl acetate, 3 parts of vinylmethyldiethoxysilane, and 1 part of tert-butyl peroxide, mix them evenly, and react them at 112℃ for 6.5 h to obtain compound A;

[0105] Take 1.5 parts of zeolite, 2.2 parts of coconut oil fatty acid diethanolamide, and 2.8 parts of compound A, mix them evenly to obtain a foaming agent;

[0106] The mass ratio of the zeolite, coconut oil fatty acid diethanolamide, and compound A is 1.5:2.2:2.8.

[0107] Step 2: Preparation of gel material:

[0108] 36 parts of polyvinyl alcohol were dissolved in water to obtain a 4 wt% polyvinyl alcohol solution for later use; 20 parts of glass fiber were placed in a 5 wt% sodium hydroxide solution and alkalized at 80°C for 5 hours; the temperature was lowered to 50°C and 18 wt% hydrogen peroxide solution was added, and the pH was adjusted to 11.5 using sodium hydroxide for hydrophilic treatment for 1.5 hours, followed by washing and drying; the fiber was transferred to a polyvinyl alcohol solution, 2 parts of glyoxal were added, and the mixture was stirred evenly. The pH was controlled at 3.3 using hydrochloric acid solution, and the mixture was reacted at a stirring speed of 1000 rpm and a temperature of 88°C for 9 hours. The mixture was then washed and freeze-dried to obtain a gel material.

[0109] Step 3: Preparation of gypsum core layer material:

[0110] The gel material and foaming agent are dissolved in deionized water and stirred to disperse, thus obtaining raw material A; gypsum, starch, and water-reducing agent are mixed evenly to obtain raw material B; raw material B is added to raw material A and mixed evenly to obtain gypsum core material.

[0111] The gypsum core material comprises the following components by weight: 100 parts gypsum, 5 parts starch, 10 parts gelling material, 0.07 parts foaming agent, 57 parts deionized water, and 0.1 parts water-reducing agent.

[0112] Step 4: Preparation of paper-faced gypsum board:

[0113] 0.5 parts of nano-silica were ultrasonically dispersed in ethanol to obtain an 8 wt% suspension; 0.3 parts of tetraethyl silicate, 1.5 parts of hydroxyl-terminated polydimethylsiloxane, and 0.05 parts of dibutyltin dichloride were added and stirred evenly to obtain an impregnation solution.

[0114] The face paper and the backing paper were placed in the impregnation solution and impregnated at 26°C for 35 minutes to obtain the treated face paper and the treated backing paper.

[0115] Under the mold, the gypsum core layer material is poured onto the treated base paper. The thickness of the gypsum core layer material is 12mm. Then, the treated face paper is laid on its surface and dried to obtain paper-faced gypsum board.

[0116] The mass per unit volume of the face paper is 210 g / m³. 2 The base paper has a unit area mass of 190 g / m². 2 .

[0117] experiment:

[0118] The paper-faced gypsum boards prepared in Examples 1-3 and Comparative Examples 1-3 were tested according to GB / T9775-2008 "Paper-faced Gypsum Board" 6.5.9. The test specimens were placed face up and cut into specimens of 300mm×400mm×9.5mm. The transverse and longitudinal breaking loads of the paper-faced gypsum boards were tested.

[0119] Example Transverse fracture load (N) Longitudinal fracture load (N) Example 1 341 721 Example 2 339 718 Example 3 343 724 Comparative Example 1 314 678 Comparative Example 2 303 647 Comparative Example 3 308 662

[0120] Conclusion: The data comparison in the table shows that the paper-faced gypsum boards prepared in Examples 1 to 3 have high strength. Comparative Example 1 reduced the amount of modified zeolite, resulting in poorer foaming and weaker strength of the paper-faced gypsum board. Comparative Example 2 used vinylmethyldiethoxysilane instead of compound A, without introducing macromolecular substances, resulting in poor foaming density, decreased foaming effect, and reduced mechanical properties of the paper-faced gypsum board. Comparative Example 3 used zeolite instead of modified zeolite, leading to uneven dispersion of the zeolite in the foaming agent system. The amino groups on the modified zeolite in Examples 1 to 3 can react with the silanol groups in the impregnation solution, strengthening the interfacial force between the gypsum core layer and the paper panel, thereby enhancing the mechanical properties of the paper-faced gypsum board.

[0121] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing high-strength, impact-resistant paper-faced gypsum board, characterized in that: Includes the following steps: Step 1: Dissolve the foaming agent and gelling material in deionized water and stir to disperse to obtain raw material A; mix gypsum, starch and water-reducing agent evenly to obtain raw material B; add raw material B to raw material A and mix evenly to obtain gypsum core material; Step 2: Place the face paper and backing paper separately in the impregnation solution and impregnate them at 25-27℃ for 30-40 minutes to obtain the treated face paper and the treated backing paper. Step 3: Under the mold, pour the gypsum core layer material onto the treated base paper, and then cover the surface with the treated face paper. After drying, you will get paper-faced gypsum board. The foaming agent is prepared by taking modified zeolite, coconut oil fatty acid diethanolamide, and compound A, mixing them evenly to obtain the foaming agent; The preparation method of compound A is as follows: polyacrylic acid, butyl acetate, vinylmethyl diethoxysilane, and tert-butyl peroxide are mixed evenly and reacted at 110-115℃ for 6-7 hours to obtain compound A. The modified zeolite is prepared by: taking zeolite and nitric acid solution, stirring at 50-60℃ for 10-12h, centrifuging and drying, adding toluene solution, stirring evenly, adding aminopropyltrimethoxysilane coupling agent, reacting at 50-60℃ for 10-14h, washing and drying to obtain modified zeolite. In step two, the impregnation solution is prepared by ultrasonically dispersing nano-silica in ethanol, adding tetraethyl silicate, hydroxyl-terminated polydimethylsiloxane, and dibutyltin dichloride, and stirring until homogeneous to obtain the impregnation solution.

2. The method for preparing a high-strength impact-resistant paper-faced gypsum board according to claim 1, characterized in that: The gypsum core material comprises the following components by weight: 100 parts gypsum, 3-6 parts starch, 8-12 parts gelling material, 0.05-0.1 parts foaming agent, 55-60 parts deionized water, and 0.05-0.2 parts water-reducing agent.

3. The method for preparing a high-strength impact-resistant paper-faced gypsum board according to claim 1, characterized in that: The mass ratio of the modified zeolite, coconut oil fatty acid diethanolamide, and compound A is 1.5:(2-2.5):(2.5-3).

4. The method for preparing a high-strength impact-resistant paper-faced gypsum board according to claim 1, characterized in that: The preparation method of the gel material is as follows: polyvinyl alcohol is dissolved in water to obtain a polyvinyl alcohol solution; glass fiber is placed in sodium hydroxide solution for alkalization treatment, hydrogen peroxide solution is added, and the treatment is carried out for 1-2 hours. After washing and drying, the fiber is transferred to the polyvinyl alcohol solution, glyoxal is added, and the mixture is stirred evenly. The pH is controlled at 3.2-3.5 using hydrochloric acid solution, and the reaction is carried out for 8-10 hours. After washing and freeze-drying, the gel material is obtained.

5. The method for preparing a high-strength impact-resistant paper-faced gypsum board according to claim 4, characterized in that: The glass fiber has a length of 1-2 mm and a diameter of 5-30 μm.

6. A high-strength impact-resistant gypsum board prepared by the method for preparing a high-strength impact-resistant gypsum board according to any one of claims 1-5.