Sound insulation gypsum and preparation method and application thereof

Abstract

The invention belongs to the technical field of gypsum, and particularly relates to soundproof gypsum as well as a preparation method and application thereof. The soundproof gypsum comprises a component A, a component B and a component C, the component A comprises polyacrylamide and an auxiliary agent; the component B comprises semi-hydrated desulfurized gypsum, cement, nitrile rubber, glass beads, mica powder, a water-retaining agent and an air entraining agent; the component C comprises water; the use amount of the polyacrylamide is 0.18 to 0.68 part by mass, the use amount of the nitrile rubber is 1.7 to 8.3 parts by mass, the use amount of the mica powder is 3.3 to 12.5 parts by mass, the use amount of the water-retaining agent is 0.03 to 0.36 part by mass, and the use amount of the air entraining agent is 0.008 to 0.088 part by mass. Through the combined action of polyacrylamide, nitrile rubber powder, mica powder, glass beads and air entraining agent, the sound transmission and sound wave consumption can be reduced, the sound insulation effect of the gypsum is improved, and meanwhile, the strength and water resistance of the gypsum can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of gypsum, and in particular relates to sound-insulating gypsum and a preparation method and application thereof. Background Art

[0002] With the acceleration of urbanization, the problem of building noise pollution has become increasingly prominent, especially in densely populated areas such as residential areas, commercial areas and industrial areas. Although traditional building sound insulation materials, such as bricks and concrete walls, have certain sound insulation effects, they have problems such as heavy weight, inconvenient construction and poor environmental performance. In addition, while these materials provide sound insulation effects, they often ignore other properties of the materials, such as strength, water resistance and mildew resistance, which limits their application in modern buildings.

[0003] As a lightweight and environmentally friendly building material, gypsum has been widely used in the construction industry. However, the sound insulation effect of ordinary gypsum is not ideal and it is difficult to meet the high sound insulation requirements. In addition, gypsum materials are prone to absorb water and mold in humid environments, which affects their service life and aesthetics. At present, there are some improved gypsum materials on the market, which improve the sound insulation effect by adding specific additives or using special preparation processes. However, these gypsum materials often sacrifice other properties of gypsum materials while improving the sound insulation performance, such as mechanical strength, water resistance, etc., or increase production costs.

[0004] Therefore, it is of great significance to provide a gypsum with good sound insulation effect, good mechanical strength and water resistance. Summary of the invention

[0005] The present invention aims to solve one or more technical problems existing in the above-mentioned prior art and at least provide a beneficial choice. Specifically, the present invention provides a sound-insulating gypsum, which has good sound-insulating effect, good mechanical strength and water resistance.

[0006] The inventive concept of the present invention: the sound-insulating gypsum of the present invention comprises component A, component B and component C; the component A comprises polyacrylamide and an additive; the component B comprises semi-hydrated desulfurized gypsum, cement, nitrile rubber, vitrified microspheres, mica powder, a water-retaining agent and an air-entraining agent; the component C comprises water; and in proportion by mass, the amounts of the polyacrylamide, nitrile rubber, mica powder, a water-retaining agent and an air-entraining agent are 0.18-0.68 parts, 1.7-8.3 parts, 3.3-12.5 parts, 0.03-0.36 parts and 0.008-0.088 parts, respectively. The polyacrylamide (PAM) in the component A of the present invention is a linear high molecular polymer; the amide groups on the molecular chain can react with the hydroxymethyl in the water retaining agent to crosslink the molecular chain, so that the slurry obtains a higher strength after drying; in addition, PAM can also produce a complex reaction with inorganic substances and metal ions in cement and gypsum, so that the entire system obtains a relatively compact hydrophobic structure, which can effectively block the intrusion of water, prevent water from destroying the formed calcium sulfate dihydrate crystals, and improve the water resistance of gypsum. At the same time, the nitrile rubber powder, mica powder, and vitrified microbeads in the component B of the present invention can form a micro core-shell structure under the action of an air entraining agent, with the nitrile rubber as the core and the mica powder and vitrified microbeads as the shell. The three are closely combined in the slurry under the adsorption of the polar groups of the polyacrylamide in the component A, so that a hollow micro core-shell particle structure is obtained after the slurry is dried, and this micro core-shell particle structure is conducive to reducing the propagation of sound and consuming the sound waves of sound, thereby obtaining a good sound insulation effect.

[0007] Thus, a first aspect of the present invention provides a sound insulating plaster.

[0008] Specifically, the sound-insulating gypsum comprises component A, component B and component C;

[0009] The component A includes polyacrylamide and additives; the component B includes semi-hydrated desulfurized gypsum, cement, nitrile rubber, vitrified microspheres, mica powder, water retaining agent, and air entraining agent; the component C includes water;

[0010] And in terms of weight, the usage of the polyacrylamide, nitrile rubber, mica powder, water-retaining agent and air-entraining agent are 0.18-0.68 parts, 1.7-8.3 parts, 3.3-12.5 parts, 0.03-0.36 parts and 0.008-0.088 parts respectively.

[0011] Preferably, the amounts of the polyacrylamide, nitrile rubber, mica powder, water retaining agent and air entraining agent are 0.21-0.62 parts, 1.87-7.68 parts, 3.6-11.5 parts, 0.03-0.33 parts and 0.008-0.08 parts respectively by mass.

[0012] Preferably, the auxiliary agent includes at least one of a pH adjuster, a desiccant and a thixotropic thickener.

[0013] Preferably, the B component further comprises at least one of a water-proofing agent, a filler, a starch ether and a retarder.

[0014] Preferably, the auxiliary agent includes a pH regulator, a desiccant and a thixotropic thickener; the B component also includes a waterproofing agent, a filler, a starch ether and a retarder; and by weight, the A component includes 0.18-0.68 parts of polyacrylamide, 0.035-0.38 parts of pH regulator, 0.055-0.38 parts of desiccant and 0.07-0.40 parts of thixotropic thickener; the B component includes semi-hydrated desulfurized gypsum 52-90 parts, cement 2.2-8.9 parts, nitrile rubber 1.7-8.3 parts, glass beads 2.1-10.7 parts, mica powder 3.3-12.5 parts, water retaining agent 0.03-0.36 parts, air entraining agent 0.008-0.088 parts, waterproofing agent 0.009-0.55 parts, filler 3.2-10 parts, starch ether 0.01-0.11 parts, retarder 0.04-0.30 parts.

[0015] Further preferably, the auxiliary agent includes a pH regulator, a desiccant and a thixotropic thickener; the B component also includes a waterproofing agent, a filler, a starch ether and a retarder; and by weight, the A component includes 0.21-0.62 parts of polyacrylamide, 0.04-0.35 parts of a pH regulator, 0.06-0.35 parts of a desiccant and 0.08-0.37 parts of a thixotropic thickener; the B component includes 57 parts of semi-hydrated desulfurized gypsum .87-84.32 parts, cement 2.4-8.1 parts, nitrile rubber 1.87-7.68 parts, glass beads 2.3-9.8 parts, mica powder 3.6-11.5 parts, water retaining agent 0.03-0.33 parts, air entraining agent 0.008-0.08 parts, waterproofing agent 0.009-0.5 parts, filler 3.5-9.2 parts, starch ether 0.01-0.1 parts, retarder 0.04-0.28 parts.

[0016] Preferably, the polyacrylamide includes at least one of cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide and zwitterionic polyacrylamide; further preferably, the polyacrylamide is cationic polyacrylamide.

[0017] Preferably, the pH regulator includes at least one of sodium bicarbonate, sodium triphosphate and potassium triphosphate.

[0018] Preferably, the thixotropic thickener includes at least one of magnesium aluminum silicate and magnesium lithium silicate; further preferably, the thixotropic thickener is magnesium lithium silicate.

[0019] Preferably, the desiccant includes at least one of anhydrous sodium sulfate and anhydrous magnesium sulfate.

[0020] Preferably, the semi-hydrated desulfurized gypsum is obtained by calcining and grinding desulfurized gypsum.

[0021] Preferably, the cement is silicate cement, and the strength of the silicate cement includes at least one of grade 42.5, grade 42.5R, grade 52.5, and grade 52.5R.

[0022] Preferably, the filler is a fine filler, and the fine filler includes at least one of fly ash, quartz powder and double fly ash.

[0023] Preferably, the nitrile rubber is powdered nitrile rubber, the fineness of the powdered nitrile rubber is 35-110 meshes, and the acrylonitrile content in the nitrile rubber is 25-50%; further preferably, the fineness of the powdered nitrile rubber is 40-100 meshes, and the acrylonitrile content in the nitrile rubber is 30-47%.

[0024] Preferably, the particle size of the vitrified microspheres is 35-80 meshes, and the bulk density of the vitrified microspheres is 70-120 kg / m 3 Further preferably, the particle size of the vitrified microspheres is 40-70 mesh, and the bulk density of the vitrified microspheres is 80-110 kg / m 3 .

[0025] Preferably, the particle size of the mica powder is 55-1350 mesh; more preferably, the particle size of the mica powder is 60-1250 mesh.

[0026] Preferably, the water retaining agent includes at least one of hydroxymethyl cellulose and sodium hydroxymethyl cellulose; further preferably, the water retaining agent is hydroxymethyl cellulose.

[0027] Preferably, the air entraining agent includes at least one of sodium dodecylbenzene sulfonate, sodium stearoyl lactylate, sodium polystyrene sulfonate, sodium dodecyl sulfate, and hexadecyltrimethylammonium bromide.

[0028] Preferably, the waterproofing agent includes at least one of siloxane and methyl silicate waterproofing agents.

[0029] Preferably, the siloxane waterproofing agent includes at least one of octyl triethoxysilane, isobutyl triethoxysilane, polymethyl silsesquioxane, allyl isobutyl polysilsesquioxane, and dimethylsilyl-cage polysilsesquioxane.

[0030] Preferably, the methyl silicate waterproofing agent includes at least one of sodium methyl silicate and potassium methyl silicate.

[0031] Preferably, the retarder comprises at least one of a protein retarder and tartaric acid.

[0032] Preferably, the mass ratio of component A to component B is 1:(80-120); further preferably, the mass ratio of component A to component B is 1:(90-110); further preferably, the mass ratio of component A to component B is 1:100.

[0033] Preferably, the gypsum also includes water, and the amount of water accounts for 52-70% of the mass of the B component; further preferably, the amount of water accounts for 58-63% of the mass of the B component; further preferably, the amount of water may account for 55%, 58%, 61%, 63%, 65%, 68% or 70% of the mass of the B component.

[0034] The second aspect of the present invention provides a method for preparing the sound-insulating gypsum according to the first aspect of the present invention.

[0035] Specifically, the method for preparing the sound-insulating gypsum comprises the following steps:

[0036] Mixing the raw material components of component A to obtain the component A;

[0037] The raw material components of component B are mixed to obtain the component B; the component A and component C are mixed, and then the component B is added and mixed to obtain the gypsum.

[0038] Preferably, the method for preparing the sound-insulating gypsum comprises the following steps:

[0039] (1) adding the raw material components of component A into a blender and mixing them to obtain the component A; adding the raw material components of component B into a blender and mixing them to obtain the component B;

[0040] (2) First, the components A and C are mixed, and then the component B is added and mixed to obtain the gypsum.

[0041] Preferably, in steps (1) and (2), the mixers are both horizontal twin-ribbon mixers.

[0042] The third aspect of the present invention provides a use of the sound-insulating gypsum described in the first aspect of the present invention in the field of construction.

[0043] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0044] (1) The amide groups on the molecular chains of the polyacrylamide in the component A of the present invention can react with the hydroxymethyl in the water retaining agent to form crosslinked molecular chains, thereby obtaining a higher strength after the slurry is dried; in addition, the polyacrylamide can also react with inorganic substances and metal ions in cement and gypsum to form a relatively compact hydrophobic structure for the entire system, which can effectively block the intrusion of water, prevent water from destroying the formed calcium sulfate dihydrate crystals, and improve the water resistance of gypsum. At the same time, the nitrile rubber powder, mica powder, and vitrified microspheres in the component B of the present invention can form a micro core-shell structure under the action of the air entraining agent, with the nitrile rubber as the core and the mica powder and vitrified microspheres as the shell. The three are closely combined in the slurry under the adsorption of the polar groups of the polyacrylamide in the component A, thereby obtaining a hollow micro core-shell particle structure after the slurry is dried. This micro core-shell particle structure is conducive to reducing the propagation of sound and consuming the sound waves of sound, thereby obtaining a good sound insulation effect.

[0045] (2) Polyacrylamide can also produce hydrogen bond reaction with waterproofing agent to obtain a more compact hydrophobic structure, further blocking the intrusion of water, preventing water from destroying the formed calcium sulfate dihydrate crystals, and improving the water resistance of gypsum.

[0046] (3) The preparation process of the present invention is simple and convenient for large-scale production and application. DETAILED DESCRIPTION

[0047] In order to make the technical scheme of the present invention more clearly understood by those skilled in the art, the following embodiments are listed for illustration. It should be pointed out that the following embodiments do not limit the protection scope of the present invention.

[0048] Unless otherwise specified, the raw materials, reagents or devices used in the following examples can be obtained from conventional commercial sources or by existing known methods.

[0049] The source information of the relevant raw material components in the examples and comparative examples of the present invention are as follows:

[0050] Polyacrylamide: Henan Saike Environmental Protection Technology Co., Ltd., anion 8 million;

[0051] pH adjuster: Hunan Hailian Sanyi Baking Soda Co., Ltd., sodium bicarbonate;

[0052] Anhydrous sodium sulfate: Langfang Kangpu Huiwei Technology Co., Ltd.;

[0053] Thixotropic thickener: Lingshou County Shuolong Mineral Products Processing Plant, lithium magnesium silicate;

[0054] Semi-hydrated desulfurized gypsum: Changzhou Guojunchun Building Materials Co., Ltd.

[0055] Portland cement: Yingde Conch cement ash 425R ordinary silicate;

[0056] Fine filler: Guangxi Hezhou Kanglubao New Material Technology Co., Ltd., 250BL double fly powder;

[0057] Powdered nitrile rubber: Jingjiang Kanggaote New Material Technology Co., Ltd.

[0058] Vitrified microspheres: Zhangzhou Xinqiangwei Industrial Co., Ltd., light sand C200;

[0059] Mica powder: Anhui Dongyang Mineral Products Sales Co., Ltd., mica powder DY-800;

[0060] Water-retaining agent: Hubei Dibai Chemical Co., Ltd., hydroxymethyl cellulose;

[0061] Starch ether: Guangdong Longhu Technology Co., Ltd., starch ether Casucol 301;

[0062] Retarder: Shijiazhuang Mingtu Building Materials Co., Ltd., HG gypsum retarder;

[0063] Air entraining agent: Shanghai Shangnan New Materials Co., Ltd., dispersant LY12;

[0064] Siloxane waterproofing agent: Jiangsu Fujilia Building Materials Co., Ltd., FJ80 silicone hydrophobic powder.

[0065] The raw material components and amounts of Examples 1-8 of the present invention are shown in Table 1, and the raw material components and amounts of Comparative Examples 1-10 are shown in Table 2.

[0066] The amount of water used in Examples 1-8 and Comparative Examples 1-10 is 61% of the mass of component B.

[0067] Table 1: Raw material components and amounts (parts by mass) of Examples 1-8 of the present invention

[0068]

[0069]

[0070] Table 2: Raw material components and dosages of comparative examples 1-10 (parts by mass)

[0071]

[0072] Example 1

[0073] A sound-insulating gypsum, the raw material components and usage thereof are shown in Table 1.

[0074] A method for preparing sound-insulating gypsum comprises the following steps:

[0075] (1) adding the raw materials of component A into a horizontal double-screw ribbon mixer at a speed of 60 r / min and a mixing time of 10 min to obtain component A; adding the raw materials of component B into a horizontal double-screw ribbon mixer at a speed of 60 r / min and a mixing time of 10 min to obtain component B;

[0076] (2) Add water to the dispersion tank, then slowly add component A to the dispersion tank, stirring while adding, and stirring for 15 minutes after adding. Then slowly add component B to the dispersion tank, stirring while adding, and stirring for 15 minutes after adding. The sound-insulating gypsum is obtained.

[0077] Embodiment 2-8

[0078] The raw material components and amounts of the sound-insulating gypsum of Examples 2-8 are shown in Table 1.

[0079] The preparation method of the sound-insulating gypsum of Examples 2-8 is the same as that of Example 1.

[0080] Comparative Example 1

[0081] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 1 are shown in Table 2.

[0082] Specifically, the difference between Comparative Example 1 and Example 1 is that Comparative Example 1 uses an equal amount of anhydrous sodium sulfate to replace polyacrylamide, that is, does not contain polyacrylamide, and the rest is the same as Example 1.

[0083] Comparative Example 2

[0084] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 2 are shown in Table 2.

[0085] Specifically, the difference between Comparative Example 2 and Example 1 is that the amount of polyacrylamide in Comparative Example 2 is increased to 0.65 parts by mass, and correspondingly, the amount of anhydrous sodium sulfate is increased to 0.02 parts by mass, and the rest is the same as Example 1.

[0086] Comparative Example 3

[0087] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 3 are shown in Table 2.

[0088] Specifically, the difference between Comparative Example 3 and Example 1 is that Comparative Example 3 uses an equal amount of fine filler to replace the powdered nitrile rubber, that is, does not contain powdered nitrile rubber, and the rest is the same as Example 1.

[0089] Comparative Example 4

[0090] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 4 are shown in Table 2.

[0091] Specifically, the difference between Comparative Example 4 and Example 1 is that the amount of powdered nitrile rubber in Comparative Example 4 is increased to 9.37 parts by mass, and correspondingly, the amount of fine filler is increased to 1.02 parts by mass, and the rest is the same as Example 1.

[0092] Comparative Example 5

[0093] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 5 are shown in Table 2.

[0094] Specifically, the difference between Comparative Example 5 and Example 1 is that Comparative Example 5 uses an equal amount of fine filler to replace mica powder, that is, does not contain mica powder, and the rest is the same as Example 1.

[0095] Comparative Example 6

[0096] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 6 are shown in Table 2.

[0097] Specifically, the difference between Comparative Example 6 and Example 1 is that the amount of mica powder in Comparative Example 6 is increased to 13 parts by mass, and correspondingly, the amount of fine filler is 1 part by mass, and the rest is the same as Example 1.

[0098] Comparative Example 7

[0099] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 7 are shown in Table 2.

[0100] Specifically, the difference between Comparative Example 7 and Example 1 is that Comparative Example 7 uses an equal amount of fine filler to replace the water retaining agent, that is, does not contain the water retaining agent, and the rest is the same as Example 1.

[0101] Comparative Example 8

[0102] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 8 are shown in Table 2.

[0103] Specifically, the difference between Comparative Example 8 and Example 1 is that the amount of the water retaining agent in Comparative Example 8 is increased to 0.56 parts by mass, and correspondingly, the amount of the fine filler is 5.64 parts by mass, and the rest is the same as Example 1.

[0104] Comparative Example 9

[0105] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 9 are shown in Table 2.

[0106] Specifically, the difference between Comparative Example 9 and Example 1 is that Comparative Example 9 uses an equal amount of fine filler to replace the air entraining agent, that is, does not contain the air entraining agent, and the rest is the same as Example 1.

[0107] Comparative Example 10

[0108] The raw material components and dosage of the sound-insulating gypsum of Comparative Example 10 are shown in Table 2.

[0109] Specifically, the difference between Comparative Example 10 and Example 1 is that the amount of the air entraining agent in Comparative Example 10 is increased by 0.2 parts by mass, and correspondingly, the amount of the fine filler is increased by 5.84 parts by mass, and the rest is the same as Example 1.

[0110] Performance Testing

[0111] The gypsum prepared in Examples 1-8 and Comparative Examples 1-10 was subjected to performance tests, and the specific test items and test methods are as follows:

[0112] Compressive strength, flexural strength, tensile bond strength: tested in accordance with GB / T 28627-2023;

[0113] Impact sound insulation effect: Tested in accordance with GB / T 19889.6-2005;

[0114] Water absorption: Refer to "JC / T 1004-2017 Ceramic Tile Grout" for testing, and use water absorption to evaluate the water resistance of gypsum.

[0115] The performance test results of the gypsum prepared in Examples 1-8 and Comparative Examples 1-10 are shown in Table 3.

[0116] Table 3: Performance test results of gypsum prepared in Examples 1-8 and Comparative Examples 1-10

[0117]

[0118] It can be seen from Table 3 that the gypsum prepared by the present invention has good sound insulation effect, and also has good strength and water resistance.

[0119] Comparative Example 1 does not contain polyacrylamide, Comparative Example 5 does not contain mica powder, and Comparative Example 7 does not contain a water retaining agent, so that the sound insulation effect, strength and water resistance of the gypsum of Comparative Examples 1, 5 and 7 are all worse than those of Example 1.

[0120] Comparative Example 3 does not contain powdered nitrile rubber, so that the sound insulation effect of the gypsum in Comparative Example 3 is significantly worse than that in Example 1, and the water resistance is worse than that in Example 1.

[0121] Comparative Example 9 does not contain an air entraining agent, so the sound insulation effect of the gypsum in Comparative Example 9 is significantly worse than that in Example 1.

[0122] Comparative Example 2 increases the amount of polyacrylamide, so that the sound insulation effect, flexural strength, compressive strength and water resistance of the gypsum in Comparative Example 2 are all worse than those in Example 1. Comparative Example 4 increases the amount of powdered nitrile rubber, Comparative Example 8 increases the amount of water retaining agent, and Comparative Example 10 increases the amount of air entraining agent, so that the sound insulation effect, strength and water resistance of the gypsum in Comparative Examples 4, 8 and 10 are all worse than those in Example 1. Comparative Example 6 increases the amount of mica powder, so that the sound insulation effect and strength of the gypsum in Comparative Example 6 are worse than those in Example 1.

[0123] In summary, the present invention can improve the strength of gypsum through the combined effects of polyacrylamide, nitrile rubber powder, mica powder, vitrified microspheres, and air entraining agent, and can reduce the propagation of sound and the sound waves that consume sound, thereby obtaining a good sound insulation effect. At the same time, a relatively compact hydrophobic structure can be obtained, which can effectively block the intrusion of water, prevent water from destroying the formed calcium sulfate dihydrate crystals, and improve the water resistance of gypsum. In addition, the addition of a waterproofing agent further improves the water resistance of gypsum.

[0124] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A gypsum, characterized in that: It includes component A, component B and component C; The component A includes polyacrylamide and additives; the component B includes semi-hydrated desulfurized gypsum, cement, nitrile rubber, vitrified microspheres, mica powder, water retaining agent, and air entraining agent; the component C includes water; And in terms of weight, the usage of the polyacrylamide, nitrile rubber, mica powder, water-retaining agent and air-entraining agent are 0.18-0.68 parts, 1.7-8.3 parts, 3.3-12.5 parts, 0.03-0.36 parts and 0.008-0.088 parts respectively.

2. The gypsum according to claim 1, characterized in that The auxiliary agent includes at least one of a pH regulator, a desiccant and a thixotropic thickener; and / or the B component also includes at least one of a waterproofing agent, a filler, a starch ether and a retarder.

3. The gypsum according to claim 2, characterized in that The auxiliary agent includes a pH regulator, a desiccant and a thixotropic thickener; the B component also includes a waterproofing agent, a filler, a starch ether and a retarder; and by weight, the A component includes 0.18-0.68 parts of polyacrylamide, 0.035-0.38 parts of a pH regulator, 0.055-0.38 parts of a desiccant and 0.07-0.40 parts of a thixotropic thickener; the B component includes 52 parts of semi-hydrated desulfurized gypsum -90 parts, cement 2.2-8.9 parts, nitrile rubber 1.7-8.3 parts, glass beads 2.1-10.7 parts, mica powder 3.3-12.5 parts, water retaining agent 0.03-0.36 parts, air entraining agent 0.008-0.088 parts, waterproofing agent 0.009-0.55 parts, filler 3.2-10 parts, starch ether 0.01-0.11 parts, retarder 0.04-0.30 parts.

4. The gypsum according to claim 1, characterized in that The polyacrylamide includes at least one of cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide and zwitterionic polyacrylamide.

5. The gypsum according to claim 1, characterized in that The nitrile rubber is powdered nitrile rubber, the fineness of the powdered nitrile rubber is 35-110 meshes, and the content of acrylonitrile in the powdered nitrile rubber is 25-50%; and / or the particle size of the glass microspheres is 35-80 meshes, and the bulk density of the glass microspheres is 70-120 kg / m 3 ; and / or, the particle size of the mica powder is 55-1350 mesh.

6. The gypsum according to claim 2, characterized in that The water retaining agent includes at least one of hydroxymethyl cellulose and sodium hydroxymethyl cellulose; and / or the air entraining agent includes at least one of sodium dodecylbenzene sulfonate, sodium stearoyl lactylate, sodium polystyrene sulfonate, sodium dodecyl sulfate, and hexadecyltrimethylammonium bromide; and / or the waterproofing agent includes at least one of siloxane and methyl silicate waterproofing agents.

7. The gypsum according to any one of claims 1 to 6, characterized in that The mass ratio of the component A to the component B is 1:(80-120).

8. The gypsum according to any one of claims 1 to 6, characterized in that: The amount of water used accounts for 52-70% of the mass of the B component.

9. The method for preparing gypsum according to any one of claims 1 to 8, characterized in that: The following steps are involved: Mixing the raw material components of component A to obtain the component A; Mixing the raw material components of component B to obtain the component B; The component A and the component C are mixed, and then the component B is added and mixed to prepare the gypsum.

10. Use of the gypsum described in any one of claims 1 to 8 in the field of construction.

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