Sound-absorbing, fire-proof and heat-insulating coating for gypsum board and preparation method thereof

Abstract

The invention provides a sound-absorbing, fire-proof and heat-insulating coating for gypsum board and a preparation method thereof. The coating is a two-component coating, wherein component A comprises water, sodium hexametaphosphate, sodium dihydrogen phosphate, chlorometaphosphate emulsion, VAE emulsion, defoamer, mildew-proof and fungicide, and thickener; component B comprises magnesium sulfate powder, light-burned magnesium oxide powder, shell powder, snail powder, branch powder, bamboo branch fiber, chestnut shell powder, corn cob powder, waste clothing fiber, and low-alkali sulphoaluminate cement. After the discarded branches, bamboo branches, shells, snail shells, chestnut shells, corn cobs and waste clothing are modified, the original flammable, moisture-prone and mildew-prone wastes are changed into waterproof, fireproof, mildew-proof and moisture-proof products, that is, the comprehensive utilization of the wastes is achieved, the pollution to the environment and ecology is reduced, and the sound absorption, sound insulation, fireproof and heat-insulating properties, and mechanical strength of the gypsum board are greatly improved, thereby achieving the comprehensive utilization of solid wastes.

Description

Technical Field

[0001] The invention belongs to the technical field of comprehensive utilization of solid waste and preparation of architectural coatings, and particularly relates to a sound-absorbing, fire-proof and thermal-insulating coating for gypsum boards and a preparation method thereof. Background Art

[0002] Every year, my country produces a large amount of fresh shellfish and snails. Since their shells are inedible, they are treated as waste: such as scallop shells, oyster shells, snail shells, etc.; in the process of landscaping or tree pruning, tree branches are often treated as waste and are not effectively utilized; bamboo branches after bamboo pruning and bamboo branches after felling are also treated as waste and are not effectively utilized; there are also many plant shells, such as discarded walnut shells and chestnut shells; corn cobs after corn harvesting; damaged or unusable old clothes and other wastes; if these wastes are not handled correctly, they may become garbage accumulation and have an impact on the environment and ecology. How to make comprehensive utilization of these wastes is the problem we face. Using these wastes to make sound-absorbing, fire-proof and heat-insulating building materials can reduce the impact of noise on people's lives, reduce the loss of life and property caused by fire, and save energy. It can not only effectively utilize resource regeneration and solve environmental pollution problems, but also turn waste into treasure, which will become one of the key research directions in the future.

[0003] There are many inventions and reports on the comprehensive utilization of waste. Patent No.: CN201410621685.1 introduces a technology for making concrete using shells as coarse aggregate; Patent No.: CN106699033A introduces a technology for making concrete by processing durian shells and chestnut shells into other materials; Patent No.: CN201410272063.2, a technology for making lightweight wall panels from waste clothes. However, so far, no related technology or reports have been found on the comprehensive utilization of discarded shells, snail shells, tree branches, bamboo branches, chestnut shells, corn cobs, and waste clothes to make building materials with sound-absorbing, fire-proof and heat-insulating effects.

[0004] Nowadays, people often use gypsum boards to make fireproof partitions or suspended ceilings. Many people like to use ordinary gypsum boards with a thickness of 9-9.5mm to make suspended ceilings or partitions. However, since this type of gypsum board is relatively thin, lacks strength, is easily affected by moisture and deformed, has poor sound absorption and sound insulation effects, and has insufficient fire protection level, it will begin to decompose within 20 minutes of encountering a fire, and does not meet the A-level fire protection requirements. It also has poor thermal insulation performance. In addition, some batches of unqualified gypsum board products produced by gypsum board manufacturers have poor quality, low strength, and are prone to cracking, deformation, and falling off. Therefore, how to solve these product quality problems and avoid waste is also one of the directions worthy of research. After many experiments, the invention team made the waste into coatings and applied them to ordinary gypsum boards and unqualified gypsum boards to solve the quality problems of gypsum boards, while improving the fire prevention, sound insulation and thermal insulation properties of gypsum boards. Therefore, using these wastes to develop a coating material with sound absorption, fire prevention and thermal insulation, and applying it to ordinary gypsum boards and unqualified gypsum boards to improve the sound absorption, sound insulation, fire prevention and thermal insulation effects of these gypsum boards is one of the topics that our invention team has been studying. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art, modify a variety of solid wastes into two-component coatings and then apply them to ordinary gypsum boards and substandard gypsum boards to improve the sound absorption, fire resistance and thermal insulation performance of ordinary gypsum boards and substandard gypsum boards, and solve the technical problems of poor strength, sound absorption, fire resistance and thermal insulation performance of existing ordinary gypsum boards and substandard gypsum boards. Specifically, it is a sound-absorbing, fire-proof and thermal insulation coating for gypsum boards and a preparation method thereof.

[0006] To achieve the above purpose, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a two-component coating made from waste and a preparation method thereof, wherein the two-component coating is made of component A (liquid) and component B (powder) in a weight ratio of 1:3-4.

[0008] Component A (liquid material) is composed of the following raw materials in parts by weight: 83-93 parts of water, 0.5-1 parts of sodium hexametaphosphate, 1-2 parts of sodium dihydrogen phosphate, 5-8 parts of chloromemulsion, 3-6 parts of VAE emulsion, 0.2-0.5 parts of defoamer, 0.2-0.5 parts of mildew and fungicide, and 0.2-0.5 parts of thickener. The optimal ratio in parts by weight is: 86.5 parts of water, 1 part of sodium hexametaphosphate, 1.5 parts of sodium dihydrogen phosphate, 6 parts of chloromemulsion, 4 parts of VAE emulsion, 0.3 parts of defoamer, 0.3 parts of mildew and fungicide, and 0.4 parts of thickener.

[0009] Component B (powder) is composed of the following raw materials in parts by weight: 10-20 parts of magnesium sulfate powder, 20-40 parts of lightly burned magnesium oxide powder, 6-10 parts of modified shell powder and snail powder, 10-20 parts of modified tree branch powder, 3-5 parts of modified bamboo fiber, 6-10 parts of modified chestnut shell powder, 8-15 parts of modified corn cob powder, 3-7 parts of modified waste clothing fiber, and 6-12 parts of low-alkali sulphoaluminate cement. The optimal ratio in parts by weight is: 15 parts of magnesium sulfate powder, 30 parts of lightly burned magnesium oxide powder, 7 parts of modified shell snail powder, 11 parts of modified tree branch powder, 4 parts of modified bamboo fiber, 8 parts of modified chestnut shell powder, 10 parts of modified corn cob powder, 5 parts of modified waste clothing fiber, and 10 parts of low-alkali sulphoaluminate cement.

[0010] The preferred embodiment described in the A component material is:

[0011] Preferably, the water is purified water;

[0012] Preferably, the sodium hexametaphosphate and sodium dihydrogen phosphate are industrial grade;

[0013] Preferably, the chlorine-based emulsion is a fire-resistant chlorine-based emulsion and does not react adversely with magnesium cement and sulphoaluminate cement;

[0014] Preferably, the VAE emulsion is a fire-resistant VAE emulsion and does not react adversely with magnesium cement and sulphoaluminate cement;

[0015] Preferably, the defoamer, mildew-proofing and fungicide, and thickener are commonly used additives in architectural coatings;

[0016] The preferred embodiment described in the B component material is:

[0017] Preferably, the magnesium sulfate powder is magnesium sulfate heptahydrate powder;

[0018] Preferably, the light-burned magnesium oxide powder is a light-burned magnesium oxide powder with an activity of more than 85 and a fineness of 400-500 mesh;

[0019] Preferably, the modified shell powder and snail powder refer to shell powder and snail powder after alkalization treatment, and the ratio of scallop shell and snail shell is 1:1, and the mesh size is 200-300 mesh;

[0020] Preferably, the modified branch powder refers to branch powder that has been treated with fireproofing, moisture-proofing and mildew-proofing;

[0021] Preferably, the modified bamboo fiber refers to bamboo fiber that has been treated with fireproofing, moisture-proofing and mildew-proofing;

[0022] Preferably, the modified chestnut shell powder refers to chestnut shell powder that has been treated with fireproofing, moisture-proofing and mildew-proofing;

[0023] Preferably, the modified corncob powder refers to corncob powder that has been treated with fireproofing, moisture-proofing and mildew-proofing;

[0024] Preferably, the modified waste clothing fibers are waste clothing fibers that have been treated with fireproofing, moisture-proofing and mildew-proofing.

[0025] Preferably, the sulphoaluminate cement is low-alkali sulphoaluminate cement, which is labeled as 425 cement;

[0026] In a second aspect, the present invention provides a sound-absorbing, fire-proof and heat-insulating coating for gypsum board and a preparation method thereof, which specifically comprises the following steps:

[0027] 1. Modification and treatment of waste and its role:

[0028] (1) A method for processing discarded shell snail powder: first, discarded scallop shells and discarded snail shells are added to a 10% lime solution in a ratio of 1:1 by weight, soaked for 10 hours, taken out, dried, and crushed into a 300-350 mesh powder for standby use. The shell powder and snail powder processed by this method have the effect of improving the hardness and strength of the product;

[0029] (2) Modification and treatment method of tree branch waste: first cut the tree branches into small pieces, dry them at a high temperature of 60-85 degrees for 6-10 hours, and then crush them into 120-200 mesh powders, then add these powders into the foamed magnesium oxychloride cement slurry and stir them evenly, so that the magnesium oxychloride cement slurry can fully wrap the wood powder, and then use a wet granulator to make 40-80 mesh coarse particles, and dry and shape them. The tree branch powder particles modified by this method have a porous structure due to the coating of the foamed magnesium oxychloride cement, which not only improves the sound absorption effect, but also protects the tree branch powder from corrosion, mildew and fire. Its sound absorption and sound insulation, fireproof and heat preservation properties have been improved, and it can also be used as magnesium cement 5.1.8 crystal seeds;

[0030] (3) The modification method of waste bamboo branches is as follows: first, the bamboo branches are cut into small pieces of 2-5 mm in length, and then put into a hot mill to grind into wet fibers after being steamed, and then evenly sprayed with a mixed aqueous solution of chlorine-based emulsion and VAE emulsion that can form a film and solidify after drying, so that the mixed aqueous solution of chlorine-based emulsion and VAE emulsion is fully coated on the bamboo fibers, and after being completely solidified into a film and dried, 2-3 mm fibers are prepared. The bamboo branch fibers modified by this method have good flexibility and anti-cracking function;

[0031] (4) A modification method for waste chestnut shells: first, the chestnut shells are dried and crushed into powder of 200-250 mesh, and then added to the foamed magnesium oxysulfate cement slurry and mixed and stirred evenly. When the product is initially set but before final setting, it is first broken into small pieces, and then crushed into medium-sized granular powder of 100-150 mesh for standby use after complete solidification. The chestnut shell powder treated by this method is coated with the foamed magnesium oxysulfate cement, and the formed particles have a porous structure, which not only improves the sound absorption effect, but also plays a protective role in anti-corrosion, anti-mildew and fire prevention for the chestnut shell powder;

[0032] (5) The modification treatment method of waste corn cobs is as follows: first add the corn cobs, dry and crush them into fine powder of 300-350 mesh, then add them into the foamed magnesium oxysulfate cement slurry and mix them evenly, break them into small pieces before the product starts to set and before the product is completely set, and then crush them into fine powder of 200-250 mesh for later use;

[0033] (6) Modification and treatment method of waste clothes: first cut the waste clothes into large pieces, then use an opener to decompose them into fibers, add the decomposed waste clothes fibers into a film-curable chlorine-based emulsion aqueous solution, allow the chlorine-based emulsion aqueous solution to fully coat the clothing fibers, and after the chlorine-based emulsion aqueous solution is completely cured into a film, make it into 5-10 mm fibers for later use. The waste clothes fibers treated as above have good flexibility and tensile strength, which can not only improve the anti-cracking effect of the product, but also have certain fireproof, mildew-proof, moisture-proof and waterproof effects;

[0034] 2. The production and preparation method of component A (liquid material) is: first add sodium hexametaphosphate and sodium dihydrogen phosphate in water according to weight ratio, stir and dissolve, then add chlorometaphosphate emulsion, VAE emulsion, defoamer, mildew inhibitor and bactericide, thickener in sequence, stir evenly and pack into bags.

[0035] 3. The production method of component B (powder) is: fully mix and stir the raw materials of component B according to the weight ratio.

[0036] 4. The method of using the two-component coating of component A (liquid) and component B (powder) is: the weight ratio of component A: component B is 1:3-4. First, slowly add component B (powder) into component A (liquid) and stir evenly.

[0037] In a third aspect, the present invention provides an application of the two-component coating A and B on a gypsum board according to the first aspect, and the application method is:

[0038] First, roughen the gypsum board, and then apply the evenly mixed two-component paint to the surface of ordinary gypsum board and unqualified gypsum board. The coating thickness is between 2-5mm. The specific coating method is: spray or scrape the prepared and stirred paint evenly and flatly on the surface of ordinary gypsum board, and then place it on the drying rack to dry naturally.

[0039] The invention of this application combines these processed wastes in different proportions and different mesh sizes of coarse, medium and fine materials, and then forms hollow structures and porous structures of different particle sizes after compounding with organic and inorganic gelling materials, which can cause multiple reflections, refractions, scatterings and diffractions of sound waves when propagating in the material to realize the consumption of sound energy, give the prepared material outstanding sound absorption and sound insulation properties, and can improve the mechanical properties of the material and the damping effect on sound wave vibrations. In addition, the magnesium cement slurry and sulphoaluminate cement slurry generated by the mixing of material A (liquid material) and material B (powder material) during use, as well as organic and inorganic fire-retardant gelling materials such as chloroform emulsion and VAE emulsion, form a secondary coating on these solid wastes modified by them, and then this material is applied to ordinary gypsum board After the modification, the sound absorption and sound insulation performance, fire resistance and heat preservation performance can be greatly improved. The formed product has the characteristics of light weight, sound absorption, fire resistance and heat preservation. The product also has the characteristics of mildew resistance, moisture resistance and high strength. The discarded branches, bamboo branches, chestnut shells, corn cobs and waste clothes are changed from flammable, moisture-proof and mildew-proof to waterproof, fire-proof, mildew-proof and moisture-proof after modification. Their service life and performance have been greatly improved. The modified branch powder, chestnut shell powder and corn cob powder also have 5.1.8 seed crystal effect, which can induce the magnesium cement reaction products to transform in a favorable direction, improve the mechanical properties of magnesium cement products and shorten the curing time. The modified bamboo branch fibers and clothing fibers have good flexibility, which can improve the product's mechanical properties such as crack resistance and flexural resistance.

[0040] This product achieves the comprehensive utilization of these wastes through the compounding of A and B components, reducing the pollution caused by wastes to the environment and ecology, and improving the sound absorption, fire prevention, heat preservation and moisture-proof effects of ordinary gypsum boards and unqualified gypsum boards, solving the quality problems of these gypsum boards such as poor strength, sound absorption, fire prevention and poor heat preservation.

[0041] The beneficial effect of the present invention is that after the discarded branches, bamboo branches, shells, snail shells, chestnut shells, corn cobs and waste clothes are modified, these original flammable, moisture-prone and mildew-prone wastes are changed into waterproof, fire-proof, mildew-proof and moisture-proof products, and their service life and performance are greatly improved, that is, these wastes are comprehensively utilized, turning waste into treasure, and reducing the pollution caused by these wastes to the environment and ecology. At the same time, the quality problems of ordinary gypsum boards and unqualified gypsum boards are also solved. The two-component coating invented by the present application is compounded on these gypsum boards, so that their sound absorption, sound insulation, fire resistance and heat preservation, and mechanical strength are greatly improved, thereby realizing the comprehensive utilization of solid wastes and solving the environmental pollution problems and material waste problems caused by wastes. DETAILED DESCRIPTION

[0042] The technical solution of the invention of the present application is clearly and completely described below in conjunction with the embodiments. The specific embodiments described this time are only used to explain the present invention and do not constitute a limitation of the present invention.

[0043] Embodiment 1:

[0044] The present embodiment provides a sound-absorbing, fire-proof and thermal insulation coating for gypsum board and a preparation method thereof. The sound-absorbing, fire-proof and thermal insulation coating for gypsum board described in the present invention is a two-component coating, which is composed of component A (liquid) and component B (powder) in a weight ratio of 1:3, wherein component A (liquid) is composed of the following raw materials in parts by weight: 86.5 parts of water, 1 part of sodium hexametaphosphate, 1.5 parts of sodium dihydrogen phosphate, 6 parts of chlorometaphosphate emulsion, 4 parts of VAE emulsion, 0.3 parts of defoamer, 0.3 parts of mildew and fungicide, and 0.4 parts of thickener.

[0045] Component B (powder) is composed of the following raw materials in parts by weight: 15 parts of magnesium sulfate powder, 30 parts of light-burned magnesium oxide powder, 7 parts of modified shell snail powder, 11 parts of modified tree branch powder, 4 parts of modified bamboo branch fiber, 8 parts of modified chestnut shell powder, 10 parts of modified corn cob powder, 5 parts of modified waste clothing fiber, and 10 parts of low-alkali sulphoaluminate cement.

[0046] The present invention discloses a sound-absorbing, fire-proof and heat-insulating coating for gypsum board and a preparation method thereof, which specifically comprises the following steps:

[0047] 1. The production and preparation method of component A (liquid material) is: first add sodium hexametaphosphate and sodium dihydrogen phosphate in water according to weight ratio, stir and dissolve, then add chlorometaphosphate emulsion, VAE emulsion, defoamer, mildewproof bactericide and thickener in sequence, stir evenly and pack into bags.

[0048] 2. The production method of component B (powder) is: fully mix and stir the raw materials of component B according to the weight ratio.

[0049] 3. The mixing method of two-component coatings, component A (liquid) and component B (powder), is: component A: component B in a weight ratio of 1:3. Slowly add three parts of component B (powder) to one part of component A (liquid) and stir evenly.

[0050] 4. The application method of A and B two-component coating on ordinary gypsum board is: first roughen the ordinary gypsum board, then mix A and B two-component coatings in a weight ratio of 1:3 and stir evenly, then apply it to the surface of 9.5mm thick ordinary gypsum board, and the coating thickness is 2.5mm. The specific coating method is: spray or scrape the prepared and stirred coating evenly on the surface of ordinary gypsum board, and then place it on the drying rack to dry naturally.

[0051] Embodiment 2:

[0052] The present invention provides a sound-absorbing, fire-proof and thermal-insulating coating for gypsum board and a preparation method thereof. An ordinary 9.3 mm thick unqualified gypsum board is selected, and the two-component coating prepared in Example 1 is coated on its surface with a thickness of 4 mm. The only difference between it and Example 1 is that the two-component coating of the present invention is coated on the surface of the gypsum board with different thicknesses, and the mass thickness of the gypsum board is different. The coating thickness of this embodiment is 4 mm, and the rest is the same as Example 1.

[0053] Comparative Example 1:

[0054] This comparative example provides a sound-absorbing, fire-proof and thermal-insulating coating for gypsum board and a preparation method thereof. The difference between the comparative example and Example 1 is that in the two-component materials A and B, the branch powder, chestnut shell powder and corn cob powder composed of the raw materials of the B component have not been modified, but are directly obtained by drying and then crushing the above raw materials. The fineness and dosage of the other components and the preparation methods are the same as those in Example 1, and the selected gypsum board and coating thickness are also the same as those in Example 1.

[0055] Comparative Example 2:

[0056] This comparative example provides a sound-absorbing, fire-proof and thermal-insulating coating for gypsum board and a preparation method thereof. The only difference between the comparative example and Example 2 is that in the two-component materials A and B, the branch powder, chestnut shell powder and corn cob powder composed of the raw materials of the B component have not been modified, but are directly obtained by drying and then crushing the above raw materials. The fineness and dosage of the other components and the preparation methods are the same as those in Example 2, and the selected gypsum board and coating thickness are also the same.

[0057] Comparative Example 3:

[0058] This comparative example uses a gypsum board with a thickness of 15 mm and qualified quality, and its surface is not coated with any material.

[0059] Comparative Example 4:

[0060] This comparative example uses a gypsum board with a thickness of 18 mm and qualified quality, and its surface is not coated with any material.

[0061] Performance testing: Examples 1-2 and Comparative Examples 1-3 were tested according to the following standards, and the results are shown in Table 1; the sound absorption coefficient test standard is: GB / T20247-2006, the fire performance test standard is: GB8624-2012, and the thermal conductivity test standard is: GB / T10294-2008.

[0062] Table 1

[0063]

[0064] From Table 1, it can be seen that a sound-absorbing, fire-proof and thermal insulation coating for gypsum board and a preparation method thereof, in the material preparation, the sound absorption coefficient, fire resistance and thermal insulation performance of these discarded branches, bamboo branches, chestnut shells, corn cobs and waste clothes are improved after modification. The two-component coating made from the modified waste is compounded on the gypsum board, which has obvious sound absorption, sound insulation, fire prevention and thermal insulation effects.

Claims

1. A sound-absorbing, fire-proof and heat-insulating coating for gypsum board, characterized in that: It is a two-component coating, comprising material A and material B, wherein the weight ratio of material A to material B is material A: material B = 1:3-4, wherein component A is composed of the following raw materials by weight: 83-93 parts of water, 0.5-1 parts of sodium hexametaphosphate, 1-2 parts of sodium dihydrogen phosphate, 5-8 parts of chloromemulsion, 3-6 parts of VAE emulsion, 0.2-0.5 parts of defoamer, 0.2-0.5 parts of mildew and fungicide, 0.2-0.5 parts of thickener, wherein component B is composed of the following raw materials by weight: 10-20 parts of magnesium sulfate powder, 20-40 parts of lightly burned magnesium oxide powder, 6-10 parts of modified shell powder and snail powder, 10-20 parts of modified branch powder, 3-5 parts of treated bamboo fiber, 6-10 parts of modified chestnut shell powder, 8-15 parts of modified corn cob powder, 3-7 parts of modified waste clothing fiber, and 6-12 parts of low-alkali sulphoaluminate cement. Material A contains chloroform emulsion and VAE emulsion, and material B contains waste materials such as modified shell powder, snail powder, branch powder, bamboo fiber, chestnut shell powder, corn cob, and waste clothing fiber, all of which are made after fireproof, mildew-proof, and rot-proof modification. The chloroform emulsion and VAE emulsion contained in material A are both fire-proof elastic emulsions that do not react adversely with magnesium cement and sulphoaluminate cement. The sulphoaluminate cement in material B is 425 low-alkali sulphoaluminate cement; the treatment method of waste shell snail powder: first add the waste scallop shells and waste snail shells in a 10% lime water solution in a weight ratio of 1:1, soak for 10 hours, take out and dry, and then crush into 300-350 mesh powder; the modification treatment method of branch waste: first cut the branches into small pieces, dry them at a high temperature of 60-85 degrees for 6-10 hours, and then crush them into 120-200 mesh powder, and then add these powders to the foamed magnesium oxychloride cement slurry and stir evenly, so that the magnesium oxychloride cement slurry is fully wrapped on the wood powder, and then use a wet granulator to make 40-80 mesh coarse particles, which are dried and formed; the modification of waste bamboo branches The treatment method is as follows: firstly, the bamboo branches are cut into small pieces of 2-3 mm in length, and then, after being steamed, they are put into a hot mill and ground into wet fibers, and then, after being dried, a mixed aqueous solution of chloro-partial emulsion and VAE emulsion that can form a film is evenly sprayed on the bamboo fibers, and the mixed aqueous solution of chloro-partial emulsion and VAE emulsion is fully coated on the bamboo fibers, and after being completely cured into a film and dried, 2-3 mm fibers are made; the modification treatment method of waste chestnut shells is as follows: firstly, the chestnut shells are dried and crushed into powder of 200-250 mesh, and then added into the foamed magnesium oxysulfate cement slurry and mixed and stirred evenly, and when the product is after initial setting but before final setting, it is first broken into small pieces, and then crushed into medium-particle powder of 100-150 mesh after being completely solidified;The modification method of waste corn cobs is: first add the dried corn cobs and crush them into 300-350 mesh fine powder, then add them into the foamed magnesium oxysulfate cement slurry and mix them evenly, break them into small pieces before the initial setting and final setting of the product, and then crush them into 200-250 mesh fine powder for use after complete solidification; the modification method of waste clothes is: first cut the waste clothes into large pieces, and then use an opener to decompose them into fibers, add the decomposed waste clothing fibers into a film-forming and curable chlorine-based emulsion aqueous solution, and let the chlorine-based emulsion The aqueous solution is fully coated on the clothing fibers, and after being completely solidified into a film, it is made into 5-10mm fibers; the modified shell snail shells contained in material B have a mesh number of 300-350 meshes, the modified tree branch powder has a mesh number of 40-80 meshes, the modified bamboo branch fiber length is 2-5mm, the modified chestnut shell powder has a mesh number of 100-150 meshes, the modified corn cob powder has a mesh number of 200-250 meshes, and the modified waste clothing fiber length is 5-10mm. ; 2. The method for preparing a sound-absorbing, fire-proof and heat-insulating coating for gypsum board according to claim 1, characterized in that: The preparation method comprises the following steps: the production method of material A is: firstly add sodium hexametaphosphate and sodium dihydrogen phosphate into water according to weight ratio, stir and dissolve, then add chlorometaphosphate emulsion, VAE emulsion, defoamer, mildew-proof bactericide and thickener in turn, stir and evenly pack; the production method of material B is: fully mix the raw materials of each component according to weight ratio and stir and evenly; the use method of the two-component coating of material A and material B is: the weight ratio of component A and material B is 1:3-4, material B is slowly added into material A and stir and evenly; the application method of the two-component coating on the gypsum board is: firstly roughen the ordinary gypsum board, then mix and stir the two-component coating of A and B according to weight ratio of 1:3-4, and then apply it to the surface of the ordinary gypsum board, the coating thickness is 2-5mm, and the specific coating method is: spray or scrape the prepared and stirred coating evenly and flatly on the surface of the ordinary gypsum board, and then place it on the drying rack to dry naturally.

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