Paper-faced gypsum board and preparation method therefor, and application of distiller's grain ash in paper-faced gypsum board

Abstract

A paper-faced gypsum board and a preparation method therefor, and an application of distiller's grain ash in the paper-faced gypsum board. The paper-faced gypsum board comprises a board core and a facing paper, and the starting materials of the board core comprise: calcined gypsum, distiller's grain ash, glass fiber, modified starch, an emulsion, a water reducer, a foaming agent, and water. The preparation method for the distiller's grain ash comprises: calcining distiller's grains at 400-600°C and then grinding to nano size. The preparation method for the paper-faced gypsum board comprises: adding the distiller's grain ash, the foaming agent, and the glass fiber into water, mixing and stirring to obtain a first slurry; stirring the calcined gypsum, the modified starch, the emulsion, and the water reducer uniformly with the first slurry to obtain a second slurry; casting the second slurry between upper and lower two layers of facing paper, overlapping and bonding to form a wet board; and after the wet board solidifies, drying to obtain the paper-faced gypsum board. The addition of distiller's grain ash is conducive to the comprehensive utilization of distiller's grains solid waste, and the paper-faced gypsum board has good fire resistance, low moisture-induced deflection, and the board is not prone to deformation.

Description

Paper-faced gypsum board and its preparation method, application of distiller's grains ash in paper-faced gypsum board

[0001] This application claims priority to Chinese patent application filed on January 14, 2025, with application number CN202510059374.9, entitled "Paper-faced gypsum board and its preparation method, application of distiller's grains ash in paper-faced gypsum board", the contents of which shall be construed as incorporated herein by reference. Technical Field

[0002] This application / invention relates to, but is not limited to, the field of building materials technology, specifically to a paper-faced gypsum board with good fire resistance, low moisture deflection, and strong deformation resistance, as well as its preparation method and the application of distiller's grains ash in the paper-faced gypsum board. Background Technology

[0003] Baijiu, or Chinese liquor, is China's national liquor, with a history spanning thousands of years. Currently, the annual production of baijiu exceeds 6 million tons (t), and for every ton of baijiu produced, approximately 3-4 tons of lees are generated. In my country, the lees are primarily used for animal feed, soil improvement, or direct incineration, with very limited utilization.

[0004] Paper-faced gypsum board is a type of board made primarily from gypsum, with appropriate additives, and a special paper facing. The core of the gypsum board is mainly dihydrate gypsum, with two molecules of water of crystallization accounting for approximately 20% of its total weight. When exposed to fire, the gypsum board absorbs heat and undergoes a dehydration reaction, releasing the water of crystallization from its molecules. This effectively inhibits the rise in building and air temperature during a fire, and because it releases water vapor, it avoids the risk of asphyxiation from toxic gases during a fire. However, without fire-resistant additives, gypsum board will dehydrate, shrink, and crack under the sustained action of high-temperature flames, eventually collapsing and losing its fire-resistant properties.

[0005] Currently, fire-resistant gypsum boards on the market have added fire-resistant reinforcing fibers. Due to the tensile effect of the fibers, the gypsum board core will not fall off immediately after cracking. However, the high-temperature resistance of the fire-resistant reinforcing fibers is limited. When the fire-resistant reinforcing fibers gradually soften and fail at high temperatures, the gypsum board core will still break and fall off at the crack. In addition, during daily use, the gypsum board will soften after absorbing moisture, leading to deformation and a serious decrease in strength.

[0006] Therefore, it is necessary to develop a paper-faced gypsum board with strong fire resistance and deformation resistance. Summary of the Invention

[0007] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of protection of this application.

[0008] The first aspect of the present application provides a paper-faced gypsum board, the paper-faced gypsum board comprising a board core and a facing paper, and the raw materials of the board core comprising: gypsum clinker, vinasse ash, glass fiber, modified starch, emulsion, water reducing agent, foaming agent and water;

[0009] The preparation method of the vinasse ash comprises: calcining vinasse at 400-600 DEG C and then grinding to nanosize;

[0010] The preparation method of the paper-faced gypsum board comprises: mixing and stirring vinasse ash, foaming agent and glass fiber in water to obtain a first slurry; uniformly stirring gypsum clinker, modified starch, emulsion, water reducing agent and the first slurry to obtain a second slurry; pouring the second slurry between the upper and lower two layers of facing paper, and bonding and forming to obtain a wet board; and drying the wet board after solidification to obtain the paper-faced gypsum board.

[0011] The second aspect of the present application provides a preparation method of the paper-faced gypsum board, comprising the following steps:

[0012] (1) mixing and stirring vinasse ash, foaming agent and glass fiber in water to obtain a first slurry;

[0013] (2) uniformly stirring gypsum clinker, modified starch, emulsion, water reducing agent and the first slurry to obtain a second slurry;

[0014] (3) pouring the second slurry between the upper and lower two layers of facing paper, and bonding and forming to obtain a wet board;

[0015] (4) drying the wet board after solidification to obtain the paper-faced gypsum board.

[0016] The third aspect of the present application provides a paper-faced gypsum board prepared by the above method.

[0017] The fourth aspect of the present application provides an application of vinasse ash in a paper-faced gypsum board.

[0018] Other aspects can be appreciated upon reading and understanding the detailed description.

[0019] Detailed description

[0020] The purpose of the present application is to provide a fire-resistant and creep-resistant paper-faced gypsum board and a preparation method thereof, the paper-faced gypsum board comprising vinasse ash, which is beneficial to the comprehensive utilization of vinasse solid waste, and the paper-faced gypsum board has good fire resistance, low moisture deflection and is not easy to deform.

[0021] The first aspect of the present application provides a paper-faced gypsum board, the paper-faced gypsum board comprising a board core and a facing paper, and the raw materials of the board core comprising: gypsum clinker, vinasse ash, glass fiber, modified starch, emulsion, water reducing agent, foaming agent and water;

[0022] The method for preparing the vinasse ash comprises: grinding the vinasse calcined at 400-600 DEG C to nanometer size.

[0023] The method for preparing the paper-faced gypsum board comprises: mixing and stirring vinasse ash, foaming agent and glass fiber in water to obtain a first slurry; uniformly stirring gypsum clinker, modified starch, emulsion and water reducing agent with the first slurry to prepare a second slurry; pouring the second slurry between upper and lower cover papers, and bonding and forming to obtain a wet board; and drying the wet board after solidification to obtain the paper-faced gypsum board.

[0024] In an exemplary embodiment, the core raw material comprises, by weight fraction: 100 parts of gypsum clinker, 0.5-5 parts of vinasse ash, 0.1-1.5 parts of glass fiber, 0.2-1 part of modified starch, 0.5-3 parts of emulsion, 0.5-1 part of water reducing agent, 0.01-0.05 part of foaming agent, and 60-85 parts of water.

[0025] In an exemplary embodiment, in addition to the above raw materials, the core raw material can also comprise other additives known in the art.

[0026] In an exemplary embodiment, the core raw material comprises, by weight fraction: 100 parts of gypsum clinker, 0.5-5 parts of vinasse ash, 0.1-1.5 parts of glass fiber, 0.2-1 part of modified starch, 0.5-3 parts of emulsion, 0.5-1 part of water reducing agent, 0.01-0.05 part of foaming agent, and 60-85 parts of water.

[0027] In an exemplary embodiment, the gypsum clinker is selected from one or more of desulfurization gypsum clinker, natural gypsum clinker, phosphorus gypsum clinker and titanium gypsum clinker.

[0028] In an exemplary embodiment, the specific surface area of the gypsum clinker is 300-400 m 2 / kg, and the particle size is 30-150 μm. The specific surface area is Blaine specific surface area.

[0029] In an exemplary embodiment, the content of the vinasse ash is, for example, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, 3.5 parts by weight, 4 parts by weight, 4.5 parts by weight, 5 parts by weight, or a range between any two of the above values as end point values, but not limited to the listed values, and other unlisted values within the range are also applicable.

[0030] In an exemplary embodiment, the distiller's grains are white spirit distiller's grains.

[0031] In an exemplary embodiment, the method for preparing the distiller's grains ash comprises calcining the distiller's grains in a muffle furnace at 400-600℃ for 1-2h, and grinding to nanometer size after taking out.

[0032] In an exemplary embodiment, the particle size of the ground distiller's grains is 200-500nm.

[0033] In an exemplary embodiment, the content of the glass fiber is, for example, 0.1 parts by weight, 0.3 parts by weight, 0.6 parts by weight, 0.9 parts by weight, 1.2 parts by weight, 1.5 parts by weight, etc. or a range value between any two of the above values as the end point value, but not limited to the listed values, and other unlisted values within the range of values are also applicable.

[0034] In an exemplary embodiment, the diameter of the glass fiber is 10-20μm, and the length is 6-10mm.

[0035] In an exemplary embodiment, the content of the modified starch is, for example, 0.2 parts by weight, 0.4 parts by weight, 0.6 parts by weight, 0.8 parts by weight, 1 part by weight, etc. or a range value between any two of the above values as the end point value, but not limited to the listed values, and other unlisted values within the range of values are also applicable.

[0036] In an exemplary embodiment, the modified starch is selected from one or more of modified corn starch, modified cassava starch and modified potato starch.

[0037] In an exemplary embodiment, the viscosity of the modified starch can be 50-100Pa·s.

[0038] In an exemplary embodiment, the content of the emulsion is, for example, 0.5 parts by weight, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, 3 parts by weight, etc. or a range value between any two of the above values as the end point value, but not limited to the listed values, and other unlisted values within the range of values are also applicable.

[0039] In an exemplary embodiment, the emulsion is used as a performance enhancer and is selected from one or more of polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, butyl benzene emulsion, and benzene propylene emulsion.

[0040] In an exemplary embodiment, the content of the water reducing agent is, for example, 0.5 parts by weight, 0.6 parts by weight, 0.7 parts by weight, 0.8 parts by weight, 0.9 parts by weight, 1 part by weight, or a range between any two of the listed values as the end point values, but not limited to the listed values, and other unlisted values within the range are also applicable.

[0041] In an exemplary embodiment, the water reducing agent is selected from one or more of a polycarboxylic acid type water reducing agent and a naphthalene type water reducing agent.

[0042] In an exemplary embodiment, the content of the foaming agent is, for example, 0.01 parts by weight, 0.02 parts by weight, 0.03 parts by weight, 0.04 parts by weight, 0.05 parts by weight, or a range between any two of the listed values as the end point values, but not limited to the listed values, and other unlisted values within the range are also applicable.

[0043] In an exemplary embodiment, the foaming agent is an anionic surfactant selected from one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, and sodium fatty alcohol polyoxyethylene ether sulfate.

[0044] In an exemplary embodiment, the content of the water is, for example, 60 parts by weight, 65 parts by weight, 68 parts by weight, 70 parts by weight, 75 parts by weight, 80 parts by weight, 85 parts by weight, or a range between any two of the listed values as the end point values, but not limited to the listed values, and other unlisted values within the range are also applicable.

[0045] In an exemplary embodiment, the core raw material of the board comprises, by weight fraction: 100 parts by weight of plaster clinker, 0.5 parts by weight of wine lees ash, 0.3 parts by weight of glass fiber, 0.2 parts by weight of modified starch, 0.5 parts by weight of emulsion, 0.5 parts by weight of water reducing agent, 0.01 parts by weight of foaming agent, and 65 parts by weight of water.

[0046] In an exemplary embodiment, the core raw material of the board comprises, by weight fraction: 100 parts by weight of plaster clinker, 2 parts by weight of wine lees ash, 0.3 parts by weight of glass fiber, 0.4 parts by weight of modified starch, 1 part by weight of emulsion, 0.5 parts by weight of water reducing agent, 0.02 parts by weight of foaming agent, and 70 parts by weight of water.

[0047] In an exemplary embodiment, the core raw material of the board comprises, by weight fraction:100 parts by weight of plaster clinker, 5 parts by weight of wine lees ash, 1.5 parts by weight of glass fiber, 0.4 parts by weight of modified starch, 3 parts by weight of emulsion, 0.6 parts by weight of water reducing agent, 0.03 parts by weight of foaming agent, and 68 parts by weight of water.

[0048] In an exemplary embodiment, the fire resistance of the paper-faced gypsum board is > 9h.

[0049] The second aspect of the present application provides a preparation method of the above-mentioned paper-faced gypsum board, comprising the following steps:

[0050] (1) mixing and stirring vinasse ash, foaming agent and glass fiber in water to obtain a first slurry;

[0051] (2) uniformly stirring gypsum clinker, modified starch, emulsion and water reducing agent with the first slurry to obtain a second slurry;

[0052] (3) pouring the second slurry between the upper and lower cover papers, and bonding and shaping to form a wet board;

[0053] (4) drying the wet board after solidification to obtain the paper-faced gypsum board.

[0054] In an exemplary embodiment, the drying is performed in a drying machine, the temperature of the first zone of the drying machine is 135-150°C, the temperature of the second zone is 120-130°C, the temperature of the third zone is 90-100°C, and the speed of the drying machine is 30-40 m / min.

[0055] The third aspect of the present application provides a paper-faced gypsum board prepared by the above-mentioned method.

[0056] The fourth aspect of the present application provides an application of vinasse ash in a paper-faced gypsum board.

[0057] In an exemplary embodiment, the vinasse ash is prepared by calcining vinasse at 400-600°C and grinding to nanosize.

[0058] In an exemplary embodiment, the vinasse is white wine vinasse.

[0059] In an exemplary embodiment, the calcination time is 1-2 h.

[0060] In an exemplary embodiment, the particle size of the ground vinasse is 200-500 nm.

[0061] Compared with the prior art, the present application has the following technical effects:

[0062] In the present application, vinasse ash, desulfurized gypsum, phosphogypsum and titanium gypsum clinker are added, which are economical and environmentally friendly, reduce the pollution of solid waste to the environment, and are conducive to the recycling of solid waste; after calcining vinasse at 400-600°C, the fire resistance of the gypsum board is improved; after grinding vinasse ash to nanosize, the creep resistance of the gypsum board is improved.

[0063] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the application. Other advantages of this application may be realized and obtained by means of the methods described in the description. Detailed Implementation

[0064] The embodiments of this application will be described in detail below. Unless otherwise specified, the embodiments and features described herein can be combined arbitrarily.

[0065] This application provides a paper-faced gypsum board, which includes a core and a facing paper. The core material includes: gypsum clinker, distiller's grains ash, glass fiber, modified starch, emulsion, water-reducing agent, foaming agent and water.

[0066] The method for preparing the lees ash includes: calcining the lees at 400-600℃ and then grinding them to nanoscale size;

[0067] The preparation method of the paper-faced gypsum board includes: adding distiller's grains ash, foaming agent and glass fiber to water and mixing to obtain a first slurry; mixing gypsum clinker, modified starch, emulsion and water-reducing agent with the first slurry evenly to obtain a second slurry; pouring the second slurry between two layers of facing paper, overlapping and bonding them to form a wet board; and drying the wet board after it solidifies to obtain the paper-faced gypsum board.

[0068] In this embodiment of the application, the core material, by weight, comprises: 100 parts by weight of gypsum clinker, 0.5-5 parts by weight of distiller's grains ash, 0.1-1.5 parts by weight of glass fiber, 0.2-1 parts by weight of modified starch, 0.5-3 parts by weight of emulsion, 0.5-1 parts by weight of water-reducing agent, 0.01-0.05 parts by weight of foaming agent, and 60-85 parts by weight of water. The weight parts of the distiller's grains ash, glass fiber, modified starch, emulsion, water-reducing agent, foaming agent, and water are their weight parts relative to the main material, gypsum clinker.

[0069] In this embodiment of the application, in addition to the raw materials described above, the raw materials of the core board may also include other additives known in the art.

[0070] In the embodiments of this application, the core material, by weight, consists of: 100 parts by weight of gypsum clinker, 0.5-5 parts by weight of distiller's grains ash, 0.1-1.5 parts by weight of glass fiber, 0.2-1 parts by weight of modified starch, 0.5-3 parts by weight of emulsion, 0.5-1 parts by weight of water-reducing agent, 0.01-0.05 parts by weight of foaming agent, and 60-85 parts by weight of water.

[0071] In the embodiments of this application, the gypsum clinker is selected from one or more of desulfurized gypsum clinker, natural gypsum clinker, phosphogypsum clinker, and titanium gypsum clinker.

[0072] In this embodiment of the application, the specific surface area of ​​the gypsum clinker is 300-400 m². 2 / kg, with a particle size of 30-150μm. The specific surface area is the Blaine specific surface area.

[0073] In this embodiment of the application, the lees are baijiu (Chinese liquor) lees.

[0074] In this embodiment of the application, the method for preparing the lees ash includes: calcining the lees in a muffle furnace at 400-600℃ for 1-2 hours, and then grinding them to nanoscale size using a ball mill.

[0075] In this embodiment of the application, the particle size of the ground lees is 200-500 nm.

[0076] In the embodiments of this application, the glass fiber has a diameter of 10μm to 20μm and a length of 6mm to 10mm.

[0077] In the embodiments of this application, the modified starch is selected from one or more of modified corn starch, modified cassava starch, and modified potato starch.

[0078] In the embodiments of this application, the viscosity of the modified starch can be 50-100 Pa·s.

[0079] In the embodiments of this application, the emulsion is used as a performance enhancer and is selected from one or more of polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, styrene-butadiene emulsion, and styrene-acrylic emulsion.

[0080] In the embodiments of this application, the water-reducing agent is selected from one or more of polycarboxylate-based water-reducing agents and naphthalene-based water-reducing agents.

[0081] In the embodiments of this application, the foaming agent is an anionic surfactant selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, and sodium fatty alcohol polyoxyethylene ether sulfate.

[0082] In the embodiments of this application, the core material, by weight, includes: 100 parts by weight of gypsum clinker, 0.5 parts by weight of distiller's grains ash, 0.3 parts by weight of glass fiber, 0.2 parts by weight of modified starch, 0.5 parts by weight of emulsion, 0.5 parts by weight of water-reducing agent, 0.01 parts by weight of foaming agent, and 65 parts by weight of water.

[0083] In the embodiments of this application, the core material, by weight, includes: 100 parts by weight of gypsum clinker, 2 parts by weight of distiller's grains ash, 0.3 parts by weight of glass fiber, 0.4 parts by weight of modified starch, 1 part by weight of emulsion, 0.5 parts by weight of water-reducing agent, 0.02 parts by weight of foaming agent, and 70 parts by weight of water.

[0084] In the embodiments of this application, the core material, by weight, includes: 100 parts by weight of gypsum clinker, 5 parts by weight of distiller's grains ash, 1.5 parts by weight of glass fiber, 0.4 parts by weight of modified starch, 3 parts by weight of emulsion, 0.6 parts by weight of water-reducing agent, 0.03 parts by weight of foaming agent, and 68 parts by weight of water.

[0085] In this embodiment of the application, the fire stability of the paper-faced gypsum board is >9h.

[0086] This application also provides a method for preparing the above-mentioned paper-faced gypsum board, including the following steps:

[0087] (1) Add distiller's grains ash, foaming agent and glass fiber to water and mix to obtain the first slurry;

[0088] (2) Mix the gypsum clinker, modified starch, emulsion, water-reducing agent and the first slurry evenly to obtain the second slurry;

[0089] (3) The second slurry is poured between the upper and lower two layers of protective paper, overlapped and glued to form a wet board;

[0090] (4) After the wet board solidifies, dry it to obtain paper-faced gypsum board.

[0091] In this embodiment of the application, the drying is carried out in a dryer, with the temperature of zone one being 135-150℃, zone two being 120-130℃, and zone three being 90-100℃, and the dryer speed being 30-40m / min.

[0092] This application also provides a paper-faced gypsum board prepared by the above method.

[0093] This application also provides an application of wine lees ash in paper-faced gypsum board.

[0094] In this embodiment of the application, the lees ash is obtained by calcining lees at 400-600℃ and then grinding them to nanoscale.

[0095] In this embodiment of the application, the lees are baijiu (Chinese liquor) lees.

[0096] In the embodiments of this application, the calcination time is 1-2 hours.

[0097] In the embodiments of this application, the particle size of the ground lees is 200-500nm.

[0098] The present application will be further described in detail below with reference to specific embodiments, but these embodiments should not be construed as limiting the present application.

[0099] The raw materials used in this application are all conventional products on the market.

[0100] In the embodiments and comparative examples of this application:

[0101] Desulfurized gypsum clinker has a specific surface area of ​​318 m². 2 / kg, with a particle size of 30-150μm;

[0102] The lees are the lees from baijiu (Chinese white liquor).

[0103] The diameter of the glass fiber is 10μm to 20μm, and the length is 6mm to 10mm;

[0104] The modified corn starch was purchased from Jinzhou Dongya Building Materials Co., Ltd.

[0105] The modified cassava starch was purchased from Hebei Shenpeng Chemical Co., Ltd., with the grade number 20190724.

[0106] The polyvinyl acetate emulsion was purchased from Celanese, brand name 8482;

[0107] The vinyl acetate-ethylene copolymer emulsion was purchased from Celanese, brand name 1378;

[0108] Styrene-butadiene emulsion was purchased from Nanjing Steibo Trading Co., Ltd., and its grade was L8242.

[0109] The polycarboxylate superplasticizer was purchased from Hubei Shanshufeng Building Materials Technology Co., Ltd., brand name SSF-4000;

[0110] The naphthalene-based water-reducing agent was purchased from Shenyang Xingzhenghe Chemical Co., Ltd., and its brand name was SNF-C.

[0111] Sodium dodecyl sulfate was purchased from Jinan Yunfei Chemical Co., Ltd., and its grade was K12.

[0112] Sodium dodecylbenzenesulfonate was purchased from Shanghai Jizhi Biochemical Technology Co., Ltd., with the grade S92700.

[0113] Example 1

[0114] This embodiment provides a fire-resistant and creep-resistant paper-faced gypsum board, which includes a core and a facing paper. The core raw materials, by weight, include: 100 parts by weight of gypsum clinker, 0.5 parts by weight of distiller's grains ash, 0.3 parts by weight of glass fiber, 0.2 parts by weight of modified corn starch, 0.5 parts by weight of polyvinyl acetate emulsion, 0.5 parts by weight of polycarboxylate superplasticizer, 0.01 parts by weight of sodium dodecyl sulfate foaming agent, and 65 parts by weight of water.

[0115] The method for preparing the lees ash includes: calcining the lees in a muffle furnace at 500℃ for 1.5 hours, then grinding them with a ball mill to a particle size of 200nm.

[0116] The fire-resistant and creep-resistant paper-faced gypsum board in this embodiment is prepared by the following method:

[0117] (1) Add distiller's grains ash, foaming agent and glass fiber to water and mix to obtain the first slurry;

[0118] (2) Mix gypsum clinker, modified corn starch, polyvinyl acetate emulsion, water-reducing agent and the first slurry evenly to prepare the second slurry;

[0119] (3) The second slurry is poured between the upper and lower two layers of protective paper, overlapped and glued to form a wet board;

[0120] (4) After the wet board solidifies, it enters the dryer and is dried to obtain paper-faced gypsum board. The temperature of the first zone of the dryer is 140℃, the temperature of the second zone is 120℃, the temperature of the third zone is 90℃, and the speed of the dryer is 30m / min.

[0121] Example 2

[0122] This embodiment provides a fire-resistant and creep-resistant paper-faced gypsum board, which includes a core and a facing paper. The core raw materials, by weight, include: 100 parts by weight of gypsum clinker, 2 parts by weight of distiller's grains ash, 0.3 parts by weight of glass fiber, 0.4 parts by weight of modified cassava starch, 1 part by weight of vinyl acetate-ethylene copolymer emulsion, 0.5 parts by weight of naphthalene-based water-reducing agent, 0.02 parts by weight of sodium dodecylbenzenesulfonate foaming agent, and 70 parts by weight of water.

[0123] The preparation methods of the distiller's grains ash and fire-resistant, creep-resistant paper-faced gypsum board in this embodiment are the same as those in Embodiment 1.

[0124] Example 3

[0125] This embodiment provides a fire-resistant and creep-resistant paper-faced gypsum board, which includes a core and a facing paper. The core raw materials, by weight, include: 100 parts by weight of gypsum clinker, 5 parts by weight of distiller's grains ash, 1.5 parts by weight of glass fiber, 0.4 parts by weight of modified corn starch, 3 parts by weight of polyvinyl acetate emulsion, 0.6 parts by weight of polycarboxylate superplasticizer, 0.03 parts by weight of sodium dodecylbenzenesulfonate foaming agent, and 68 parts by weight of water.

[0126] The preparation methods of the distiller's grains ash and fire-resistant, creep-resistant paper-faced gypsum board in this embodiment are the same as those in Embodiment 1.

[0127] Comparative Example 1

[0128] The only difference between this comparative example and Example 1 is that no distiller's grains ash is added to the paper-faced gypsum board; the other components and preparation methods are the same as in Example 1.

[0129] Comparative Example 2

[0130] The only difference between this comparative example and Example 1 is that the distiller's grains ash was not ground to nanoscale during preparation, but rather to micrometer scale. All other components and preparation methods are the same as in Example 1.

[0131] Comparative Example 3

[0132] The only difference between this comparative example and Example 1 is that instead of preparing a first slurry, distiller's grains ash, foaming agent, glass fiber, water, gypsum clinker, modified starch, emulsion, and water-reducing agent are mixed together. The rest of the preparation method is the same as in Example 1.

[0133] Comparative Example 4

[0134] The only difference between this comparative example and Example 1 is that the calcination temperature of the distiller's grains ash is 700°C, while the other components and preparation methods are the same as in Example 1.

[0135] Performance testing

[0136] The performance of the 12mm thick paper-faced gypsum boards prepared in Examples 1-3 and Comparative Examples 1-4 was tested according to the method specified in Chinese National Standard GB / T 9775-2008. The test results are shown in Table 1 below.

[0137] Table 1 Implementation Results

[0138] Test results show that the fire-resistant and creep-resistant paper-faced gypsum board provided in this application has lower moisture deflection, stronger deformation resistance, better fire resistance, and higher mechanical strength compared with ordinary paper-faced gypsum board.

[0139] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A paper-faced gypsum board, the paper-faced gypsum board comprising a core and a facing paper, the core material comprising: Gypsum clinker, distiller's grains ash, glass fiber, modified starch, emulsion, water-reducing agent, foaming agent, and water; The method for preparing the lees ash includes: calcining the lees at 400-600℃ and then grinding them to nanoscale size; The preparation method of the paper-faced gypsum board includes: adding distiller's grains ash, foaming agent and glass fiber to water and mixing to obtain a first slurry; mixing gypsum clinker, modified starch, emulsion and water-reducing agent with the first slurry evenly to obtain a second slurry; pouring the second slurry between two layers of facing paper, overlapping and bonding them to form a wet board; and drying the wet board after it solidifies to obtain the paper-faced gypsum board.

2. The paper-faced gypsum board according to claim 1, wherein, The core material, by weight, includes: 100 parts gypsum clinker, 0.5-5 parts distiller's grains ash, 0.1-1.5 parts glass fiber, 0.2-1 parts modified starch, 0.5-3 parts emulsion, 0.5-1 parts water-reducing agent, 0.01-0.05 parts foaming agent, and 60-85 parts water.

3. The paper-faced gypsum board according to claim 1 or 2, wherein, The gypsum clinker is selected from one or more of desulfurized gypsum clinker, natural gypsum clinker, phosphogypsum clinker, and titanium gypsum clinker; Optionally, the specific surface area of ​​the gypsum clinker is 300-400 m². 2 / kg; Optionally, the particle size of the gypsum clinker is 30-150 μm.

4. The paper-faced gypsum board according to any one of claims 1 to 3, wherein, The method for preparing the lees ash includes: calcining the lees in a muffle furnace at 400-600℃ for 1-2 hours, then grinding them to nanoscale size using a ball mill; Optionally, the particle size of the ground lees is 200-500 nm.

5. The paper-faced gypsum board according to any one of claims 1 to 4, wherein, The lees are baijiu (Chinese liquor) lees; and / or The glass fibers have a diameter of 10 μm to 20 μm and a length of 6 mm to 10 mm; and / or The modified starch is selected from one or more of modified corn starch, modified cassava starch, and modified potato starch; and / or The emulsion is selected from one or more of polyvinyl acetate emulsion, vinyl acetate-ethylene copolymer emulsion, styrene-butadiene emulsion, and styrene-acrylic emulsion; and / or The water-reducing agent is selected from one or more of polycarboxylate-based and naphthalene-based water-reducing agents; and / or The foaming agent is an anionic surfactant.

6. The paper-faced gypsum board according to any one of claims 1 to 5, wherein, The viscosity of the modified starch is 50-100 Pa·s; and / or The foaming agent is selected from one or more of sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, and sodium fatty alcohol polyoxyethylene ether sulfate.

7. The paper-faced gypsum board according to any one of claims 1 to 6, wherein, The core material, by weight, comprises: 100 parts by weight of gypsum clinker, 0.5 parts by weight of distiller's grains ash, 0.3 parts by weight of glass fiber, 0.2 parts by weight of modified starch, 0.5 parts by weight of emulsion, 0.5 parts by weight of water-reducing agent, 0.01 parts by weight of foaming agent, and 65 parts by weight of water; or The core material, by weight, comprises: 100 parts gypsum clinker, 2 parts distiller's grains ash, 0.3 parts glass fiber, 0.4 parts modified starch, 1 part emulsion, 0.5 parts water-reducing agent, 0.02 parts foaming agent, and 70 parts water; or The core material, by weight, includes: 100 parts gypsum clinker, 5 parts distiller's grains ash, 1.5 parts glass fiber, 0.4 parts modified starch, 3 parts emulsion, 0.6 parts water-reducing agent, 0.03 parts foaming agent, and 68 parts water.

8. The paper-faced gypsum board according to any one of claims 1 to 7, wherein, The fire stability of the paper-faced gypsum board is >9h.

9. A method for preparing a paper-faced gypsum board according to any one of claims 1 to 8, comprising the following steps: (1) Add distiller's grains ash, foaming agent and glass fiber to water and mix to obtain the first slurry; (2) Mix the gypsum clinker, modified starch, emulsion, water-reducing agent and the first slurry evenly to obtain the second slurry; (3) The second slurry is poured between the upper and lower two layers of protective paper, overlapped and glued to form a wet board; (4) After the wet board solidifies, dry it to obtain paper-faced gypsum board.

10. The method according to claim 9, wherein, The drying is carried out in a dryer, with the temperature in zone one being 135-150℃, zone two being 120-130℃, and zone three being 90-100℃. The dryer speed is 30-40 m / min.

11. A paper-faced gypsum board prepared by the method of claim 9 or 10.

12. An application of wine lees ash in paper-faced gypsum board.

13. The application according to claim 12, wherein, The lees ash is obtained by calcining lees at 400-600℃ and then grinding them to nanoscale size; Optionally, the lees are baijiu lees; Optionally, the calcination time is 1-2 hours; Optionally, the particle size of the ground lees is 200-500 nm.

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