Gypsum thermal insulation mortar and preparation process thereof

Abstract

The invention relates to the technical field of building materials, and particularly discloses gypsum thermal insulation mortar and a preparation process thereof. The gypsum thermal insulation mortar is prepared from the following raw materials in parts by mass: 700-1000 parts of gypsum powder; 100 to 200 parts of glass beads; 2-3 parts of cellulose; 2-3 parts of a thixotropic agent; 1-3 parts of polypropylene fiber; 5-9 parts of latex powder; 1-2 parts of a retarder; and 50-80 parts of an auxiliary admixture. According to the invention, the auxiliary admixture component is added into the gypsum thermal insulation mortar, so that the gypsum thermal insulation mortar can be well applied to plum rain seasons in summer in Jiangsan areas, and meanwhile, the problem that the thermal insulation performance of the gypsum thermal insulation mortar is severely reduced after sudden rain after high temperature in summer can be well avoided; meanwhile, the gypsum thermal insulation mortar is accidentally found to have better compressive strength.

Description

Technical Field

[0001] The present application relates to the technical field of building materials, and more specifically, to a gypsum thermal insulation mortar and a preparation process thereof. Background Art

[0002] With the increasing requirements for building energy conservation, thermal insulation mortar has attracted widespread attention as a highly efficient building insulation material. Thermal insulation mortar is usually mixed with lightweight aggregate, cementitious materials and additives, and has the advantages of excellent thermal insulation performance, convenient construction and good durability.

[0003] Traditional thermal insulation mortars mainly include inorganic thermal insulation mortars (such as vitrified microsphere fireproof thermal insulation mortars, composite aluminum silicate thermal insulation mortars, and perlite thermal insulation mortars) and organic thermal insulation mortars (such as glue powder polystyrene particle thermal insulation mortars). Although these materials have certain thermal insulation effects, their performance stability and water resistance under extreme climatic conditions still need to be improved.

[0004] Gypsum insulation mortar is a new type of insulation material, with gypsum as the main cementing material, supplemented by lightweight aggregates and additives. It has good thermal insulation, fire resistance and sound absorption properties, and is easy to construct, and has gradually become a commonly used building insulation material on the market.

[0005] Although gypsum thermal insulation mortar technology has achieved good development, it still has the following problem, namely, the water resistance of gypsum thermal insulation mortar. After being exposed to high temperature, especially in the rainy season in summer, gypsum thermal insulation mortar is usually at a higher temperature after being exposed to high temperature. At this time, it is suddenly cooled down after being washed by the plum rain, which can easily cause the gypsum thermal insulation mortar to absorb water. Even after drying, the thermal insulation performance of the gypsum thermal insulation mortar will decrease. Summary of the invention

[0006] In order to improve the problem that gypsum thermal insulation mortar is exposed to high temperature, especially in the rainy season in summer, usually gypsum thermal insulation mortar is at a relatively high temperature after being exposed to high temperature, and then suddenly cools down after being washed by the plum rain, which easily causes the gypsum thermal insulation mortar to absorb water, and even after drying, the thermal insulation performance of the gypsum thermal insulation mortar will decrease. The present application provides a gypsum thermal insulation mortar and a preparation process thereof.

[0007] In a first aspect, the present application provides a gypsum thermal insulation mortar, which adopts the following technical solution:

[0008] A gypsum thermal insulation mortar is prepared from raw materials comprising the following components: by weight: 700-1000 parts of gypsum powder; 100-200 parts of vitrified microspheres; 2-3 parts of cellulose; 2-3 parts of thixotropic agent; 1-3 parts of polypropylene fiber; 5-9 parts of latex powder; 1-2 parts of retarder; and 50-80 parts of auxiliary admixture.

[0009] Preferably, the auxiliary admixture is prepared from dodecyl alcohol ester, polyvinyl chloride resin, sodium citrate, choline chloride, sodium silicate nonahydrate and quicklime.

[0010] Preferably, the auxiliary admixture is prepared by the following process steps:

[0011] The auxiliary admixture particles are prepared by mixing and stirring lauryl alcohol ester, sodium citrate, choline chloride, sodium silicate nonahydrate and quicklime; the polyvinyl chloride resin is heated to 100-130° C., the auxiliary admixture particles are immersed in the polyvinyl chloride resin, and the particles coated with the polyvinyl chloride resin are cooled to obtain the auxiliary admixture.

[0012] The polyethylene resin is added through the above process to coat other materials of the auxiliary admixture, so that the influence of the above components can be avoided in the process of mixing to obtain the gypsum thermal insulation mortar. When exposed to high temperatures in summer, the temperature of the gypsum thermal insulation mortar will usually rise (in most cases it will be higher than 80°C), and the polyethylene resin of the auxiliary admixture in the gypsum thermal insulation mortar will begin to soften, so that the remaining components in the auxiliary admixture are exposed and can contact the outside world; after the summer plum rain, the rainwater will come into contact with materials such as sodium citrate, choline chloride and sodium silicate nonahydrate, and the above materials are soluble in water. After the quicklime part comes into contact with water, it releases a large amount of heat to further soften the polyvinyl chloride resin, thereby allowing the remaining components of the auxiliary admixture to fully contact the external environment; at the same time, free Ca 2+ , Ca 2+ It forms calcium citrate with the citrate ions in sodium citrate. Calcium citrate is soluble in water and has a certain flow in the gypsum thermal insulation mortar. Calcium citrate reacts with the silicate ions in sodium silicate nonahydrate to form a more stable hydrated calcium silicate gel, which further fills the gaps in the gypsum thermal insulation mortar and further insulates it, thereby improving the strength of the gypsum thermal insulation mortar to a certain extent and reducing the impact on the thermal insulation performance of the gypsum thermal insulation mortar.

[0013] Preferably, the component materials of the auxiliary admixture are preferably 5-8 parts of lauryl alcohol ester; 30-50 parts of sodium citrate; 5-8 parts of choline chloride; 15-20 parts of sodium silicate nonahydrate; and 15-18 parts of quicklime.

[0014] Preferably, the viscosity of the cellulose is 80,000-120,000.

[0015] In a second aspect, the present application provides a method for preparing gypsum thermal insulation mortar, which adopts the following technical solution:

[0016] A method for preparing gypsum thermal insulation mortar, comprising the following process steps:

[0017] Gypsum powder, vitrified microspheres, cellulose, thixotropic agent, polypropylene fiber, latex powder and retarder are mixed and stirred evenly in proportion, the rotation speed is controlled at 100-300 r / min, and after stirring for 5-10 minutes, auxiliary admixtures are added in proportion, and stirred again for 1-2 minutes, the rotation speed is controlled at 10-30 r / min, and the gypsum thermal insulation mortar is obtained after mixing evenly.

[0018] Preferably, the water content of the gypsum thermal insulation mortar during the mixing process is not higher than 5%.

[0019] In summary, this application has the following beneficial effects:

[0020] The present application adds auxiliary admixture components to the gypsum thermal insulation mortar, so that the gypsum thermal insulation mortar can be better used in the rainy season in summer in the Jiangnan region, and can better avoid the problem of severe decline in the thermal insulation performance of the gypsum thermal insulation mortar after sudden rain after high temperature in summer. At the same time, it is unexpectedly found that the gypsum thermal insulation mortar also has good compressive strength. DETAILED DESCRIPTION

[0021] The present application is further described in detail below with reference to the embodiments.

[0022] Preparation Example

[0023] Preparation Example 1

[0024] An auxiliary admixture is prepared by the following process steps:

[0025] Calculated by weight, 5 parts of lauryl alcohol ester, 30 parts of sodium citrate, 5 parts of choline chloride, 15 parts of sodium silicate nonahydrate, and 15 parts of quicklime are mixed and stirred uniformly, and the stirring speed is controlled to be 50r / min to prepare and obtain particles of auxiliary admixture, wherein the particle size of the particles is not more than 10mm;

[0026] 60 parts of polyvinyl chloride resin are heated to 100° C., the particles of the auxiliary admixture are immersed in the polyvinyl chloride resin, the immersion time is controlled to be 10 seconds, and the particles coated with the polyvinyl chloride resin are cooled to obtain the auxiliary admixture.

[0027] It should be noted here that the mass fraction in the present invention is not given any unit form. For example, it can represent that 1 mass fraction is equal to 10g, or it can be 100g, 1000g, 1kg, 10kg, etc. It is mainly used to characterize the proportional relationship between the raw materials, but does not affect the preparation of gypsum thermal insulation mortar.

[0028] Preparation Example 2

[0029] An auxiliary admixture is prepared by the following process steps:

[0030] In parts by mass, 6 parts of lauryl alcohol ester, 40 parts of sodium citrate, 6 parts of choline chloride, 18 parts of sodium silicate nonahydrate, and 16 parts of quicklime are mixed and stirred uniformly, and the stirring speed is controlled to be 65r / min to prepare and obtain granules of auxiliary admixture, wherein the particle size of the granules is not more than 10mm;

[0031] 70 parts of polyvinyl chloride resin are heated to 120° C., the particles of the auxiliary admixture are immersed in the polyvinyl chloride resin, the immersion time is controlled to be 10 seconds, and the particles coated with the polyvinyl chloride resin are cooled to obtain the auxiliary admixture.

[0032] Preparation Example 3

[0033] An auxiliary admixture is prepared by the following process steps:

[0034] In parts by mass, 8 parts of lauryl alcohol ester, 50 parts of sodium citrate, 8 parts of choline chloride, 20 parts of sodium silicate nonahydrate, and 18 parts of quicklime are mixed and stirred uniformly, and the stirring speed is controlled to be 80r / min to prepare and obtain granules of auxiliary admixture, wherein the particle size of the granules is not more than 10mm;

[0035] 80 parts of polyvinyl chloride resin are heated to 130° C., the particles of the auxiliary admixture are immersed in the polyvinyl chloride resin, the immersion time is controlled to be 10 seconds, and the particles coated with the polyvinyl chloride resin are cooled to obtain the auxiliary admixture.

[0036] Preparation Example 4

[0037] An auxiliary admixture is prepared by the following process steps:

[0038] In parts by mass, 5 parts of lauryl alcohol ester, 30 parts of sodium citrate, 5 parts of choline chloride, 15 parts of sodium silicate nonahydrate, 15 parts of quicklime and 60 parts of polyvinyl chloride are mixed and stirred evenly, and the stirring speed is controlled to be 50r / min to prepare and obtain granules of auxiliary admixture, wherein the particle size of the granules is not more than 10mm.

[0039] Preparation Example 5

[0040] An auxiliary admixture is prepared by the following process steps:

[0041] In parts by mass, 5 parts of lauryl alcohol ester, 30 parts of sodium citrate, 5 parts of choline chloride, 15 parts of sodium silicate nonahydrate, 15 parts of quicklime and 60 parts of polyvinyl chloride are mixed and stirred evenly, the stirring speed is controlled to be 50 r / min, the mixture is heated to 100° C., the heating time is 5 min, and the auxiliary admixture is prepared after cooling.

[0042] Example

[0043] Example 1

[0044] A method for preparing gypsum thermal insulation mortar, comprising the following process steps:

[0045] 700 parts of gypsum powder, 100 parts of glass beads, 2 parts of cellulose, 2 parts of thixotropic agent, 1 part of polypropylene fiber, 5 parts of latex powder and 1 part of retarder are mixed in proportion and stirred evenly. The rotation speed is controlled at 100 r / min. After stirring for 5 minutes, 50 parts of auxiliary admixtures are added in proportion, stirred again for 1 minute, and the rotation speed is controlled at 10 r / min. After mixing evenly, the gypsum thermal insulation mortar is obtained.

[0046] It should be noted that the gypsum powder, glass beads, cellulose, thixotropic agent, polypropylene fiber, latex powder, retarder, etc. in the present invention are all conventionally available on the market, wherein the viscosity of cellulose is 80,000, and the auxiliary admixture is the auxiliary admixture prepared in Preparation Example 1.

[0047] It should be noted here that the mass fraction in the present invention is not given any unit form. For example, it can represent that 1 mass fraction is equal to 10g, or it can be 100g, 1000g, etc. It is mainly used to characterize the proportional relationship between the raw materials, but does not affect the preparation of gypsum thermal insulation mortar.

[0048] Example 2

[0049] A method for preparing gypsum thermal insulation mortar, comprising the following process steps:

[0050] 850 parts of gypsum powder, 150 parts of glass beads, 2.5 parts of cellulose, 2.5 parts of thixotropic agent, 2 parts of polypropylene fiber, 7.5 parts of latex powder and 1.5 parts of retarder are mixed in proportion and stirred evenly. The rotation speed is controlled at 200 r / min. After stirring for 8 minutes, 65 parts of auxiliary admixtures are added in proportion, stirred again for 1.5 minutes, and the rotation speed is controlled at 20 r / min. After mixing evenly, the gypsum thermal insulation mortar is obtained.

[0051] It should be noted that the gypsum powder, glass beads, cellulose, thixotropic agent, polypropylene fiber, latex powder, retarder, etc. in the present invention are all conventionally available on the market, wherein the viscosity of cellulose is 100,000, and the auxiliary admixture is the auxiliary admixture prepared in Preparation Example 1.

[0052] Example 3

[0053] A method for preparing gypsum thermal insulation mortar, comprising the following process steps:

[0054] 1000 parts of gypsum powder, 200 parts of glass beads, 3 parts of cellulose, 3 parts of thixotropic agent, 3 parts of polypropylene fiber, 9 parts of latex powder and 2 parts of retarder are mixed in proportion and stirred evenly. The rotation speed is controlled at 300 r / min. After stirring for 10 minutes, 80 parts of auxiliary admixtures are added in proportion, stirred again for 2 minutes, and the rotation speed is controlled at 30 r / min. After mixing evenly, the gypsum thermal insulation mortar is obtained.

[0055] It should be noted that the gypsum powder, glass beads, cellulose, thixotropic agent, polypropylene fiber, latex powder, retarder, etc. in the present invention are all conventionally available on the market, wherein the viscosity of cellulose is 120,000, and the auxiliary admixture is the auxiliary admixture prepared in Preparation Example 1.

[0056] Example 4

[0057] A method for preparing gypsum thermal insulation mortar, comprising the following process steps:

[0058] 700 parts of gypsum powder, 100 parts of glass beads, 2 parts of cellulose, 2 parts of thixotropic agent, 1 part of polypropylene fiber, 5 parts of latex powder and 1 part of retarder are mixed in proportion and stirred evenly. The rotation speed is controlled at 100 r / min. After stirring for 5 minutes, 50 parts of auxiliary admixtures are added in proportion, stirred again for 1 minute, and the rotation speed is controlled at 10 r / min. After mixing evenly, the gypsum thermal insulation mortar is obtained.

[0059] It should be noted that the gypsum powder, vitrified microspheres, cellulose, thixotropic agent, polypropylene fiber, latex powder, retarder, etc. in the present invention are all conventionally available on the market, wherein the viscosity of cellulose is 80,000, and the auxiliary admixture is the auxiliary admixture prepared in Preparation Example 2.

[0060] Example 5

[0061] A method for preparing gypsum thermal insulation mortar, comprising the following process steps:

[0062] 700 parts of gypsum powder, 100 parts of glass beads, 2 parts of cellulose, 2 parts of thixotropic agent, 1 part of polypropylene fiber, 5 parts of latex powder and 1 part of retarder are mixed in proportion and stirred evenly. The rotation speed is controlled at 100 r / min. After stirring for 5 minutes, 50 parts of auxiliary admixtures are added in proportion, stirred again for 1 minute, and the rotation speed is controlled at 10 r / min. After mixing evenly, the gypsum thermal insulation mortar is obtained.

[0063] It should be noted that the gypsum powder, vitrified microspheres, cellulose, thixotropic agent, polypropylene fiber, latex powder, retarder, etc. in the present invention are all conventionally available on the market, wherein the viscosity of cellulose is 80,000, and the auxiliary admixture is the auxiliary admixture prepared in Preparation Example 3.

[0064] Example 6

[0065] A method for preparing gypsum thermal insulation mortar, comprising the following process steps:

[0066] 700 parts of gypsum powder, 100 parts of glass beads, 2 parts of cellulose, 2 parts of thixotropic agent, 1 part of polypropylene fiber, 5 parts of latex powder and 1 part of retarder are mixed in proportion and stirred evenly. The rotation speed is controlled at 100 r / min. After stirring for 5 minutes, 50 parts of auxiliary admixtures are added in proportion, stirred again for 1 minute, and the rotation speed is controlled at 10 r / min. After mixing evenly, the gypsum thermal insulation mortar is obtained.

[0067] It should be noted that the gypsum powder, vitrified microspheres, cellulose, thixotropic agent, polypropylene fiber, latex powder, retarder, etc. in the present invention are all commercially available, wherein the viscosity of cellulose is 80,000, and the auxiliary admixture is the auxiliary admixture prepared in Preparation Example 4.

[0068] Example 7

[0069] A method for preparing gypsum thermal insulation mortar, comprising the following process steps:

[0070] 700 parts of gypsum powder, 100 parts of glass beads, 2 parts of cellulose, 2 parts of thixotropic agent, 1 part of polypropylene fiber, 5 parts of latex powder and 1 part of retarder are mixed in proportion and stirred evenly. The rotation speed is controlled at 100 r / min. After stirring for 5 minutes, 50 parts of auxiliary admixtures are added in proportion, stirred again for 1 minute, and the rotation speed is controlled at 10 r / min. After mixing evenly, the gypsum thermal insulation mortar is obtained.

[0071] It should be noted that the gypsum powder, vitrified microspheres, cellulose, thixotropic agent, polypropylene fiber, latex powder, retarder, etc. in the present invention are all conventionally available on the market, wherein the viscosity of cellulose is 80,000, and the auxiliary admixture is the auxiliary admixture prepared in Preparation Example 5.

[0072] Comparative Example

[0073] Comparative Example 1

[0074] The difference between Comparative Example 1 and Example 1 is that no auxiliary additive is added.

[0075] Application Examples

[0076] Application Example 1

[0077] After the gypsum thermal insulation mortar prepared in Example 1 is applied to the outer thermal insulation material of the building and solidifies, the solidified gypsum thermal insulation mortar is continuously irradiated with a heating source to simulate a high temperature environment in summer, so that the temperature of the irradiated gypsum thermal insulation mortar is above 90° C. After the heating source is removed, the temperature of the gypsum thermal insulation mortar is continuously measured until the temperature of the gypsum thermal insulation mortar drops to room temperature, and the cooling time T1 is recorded. The above is the step of test 1;

[0078] The solidified gypsum insulation mortar is continuously irradiated with a heating source to simulate the high temperature environment in summer, so that the temperature of the irradiated gypsum insulation mortar reaches above 90°C. The gypsum insulation mortar is cooled with a water source to simulate the summer shower environment. After drying, the gypsum insulation mortar is tested in step 1 to obtain the cooling time T2, wherein the difference between T2 and T1 does not exceed 5 minutes.

[0079] Application Example 2

[0080] After the gypsum thermal insulation mortar prepared in Example 6 is applied to the outer thermal insulation material of the building and solidified, the solidified gypsum thermal insulation mortar is continuously irradiated with a heating source to simulate a high temperature environment in summer, so that the temperature of the irradiated gypsum thermal insulation mortar is above 90° C. After the heating source is removed, the temperature of the gypsum thermal insulation mortar is continuously measured until the temperature of the gypsum thermal insulation mortar drops to room temperature, and the cooling time T1 is recorded. The above is the step of test 1;

[0081] The solidified gypsum insulation mortar is continuously irradiated with a heating source to simulate the high temperature environment in summer, so that the temperature of the irradiated gypsum insulation mortar reaches above 90°C. The gypsum insulation mortar is cooled with a water source to simulate the summer shower environment. After drying, the gypsum insulation mortar is tested in step 1 to obtain the cooling time T2, wherein the difference between T2 and T1 exceeds 40 minutes.

[0082] Application Example 3

[0083] After the gypsum thermal insulation mortar prepared in Example 7 is applied to the outer thermal insulation material of the building and solidified, the solidified gypsum thermal insulation mortar is continuously irradiated with a heating source to simulate a high temperature environment in summer, so that the temperature of the irradiated gypsum thermal insulation mortar is above 90° C. After the heating source is removed, the temperature of the gypsum thermal insulation mortar is continuously measured until the temperature of the gypsum thermal insulation mortar drops to room temperature, and the cooling time T1 is recorded. The above is the step of test 1;

[0084] The solidified gypsum insulation mortar is continuously irradiated with a heating source to simulate the high temperature environment in summer, so that the temperature of the irradiated gypsum insulation mortar reaches above 90°C. The gypsum insulation mortar is cooled with a water source to simulate the summer shower environment. After drying, the gypsum insulation mortar is tested in step 1 to obtain the cooling time T2, wherein the difference between T2 and T1 exceeds 35 minutes.

[0085] Application Example 4

[0086] After the gypsum thermal insulation mortar prepared in Comparative Example 1 is applied to the outer thermal insulation material of the building and solidified, the solidified gypsum thermal insulation mortar is continuously irradiated with a heating source to simulate a high temperature environment in summer, so that the temperature of the irradiated gypsum thermal insulation mortar is above 90° C. After the heating source is removed, the temperature of the gypsum thermal insulation mortar is continuously measured until the temperature of the gypsum thermal insulation mortar drops to room temperature, and the cooling time T1 is recorded. The above is the step of test 1;

[0087] The solidified gypsum insulation mortar is continuously irradiated with a heating source to simulate the high temperature environment in summer, so that the temperature of the irradiated gypsum insulation mortar reaches above 90°C. The gypsum insulation mortar is cooled with a water source to simulate the summer shower environment. After drying, the gypsum insulation mortar is tested in step 1 to obtain the cooling time T2, wherein the difference between T2 and T1 is far more than 60 minutes.

[0088] Performance testing

[0089] According to JC / T 2706-2022 "Gypsum Thermal Insulation Mortar", various performance tests were performed on the gypsum thermal insulation mortar prepared in Examples 1-7.

[0090] 1. Compressive strength

[0091] The compressive strength MPa results of the gypsum thermal insulation mortars prepared in Examples 1-8 and Comparative Example 1 are shown in the following table.

[0092]

[0093] It can be seen from Examples 1-7 and Comparative Example 1 and from the performance data test that the gypsum thermal insulation mortar prepared by the present invention has good water resistance and can be well applied to rainy seasons in summer in the Jiangnan region. At the same time, it can better avoid the problem of serious decline in the thermal insulation performance of the gypsum thermal insulation mortar after sudden rain after high temperatures in summer. At the same time, the gypsum thermal insulation mortar also has good compressive strength.

[0094] It can be seen from Example 1 and Example 6, Example 7, Comparative Example 1, Application Examples 1-4 and combined with performance data tests that the auxiliary admixture in the present application can improve the compressive strength of the gypsum thermal insulation mortar to a certain extent, and at the same time, the use of polyvinyl chloride resin to coat the remaining components of the auxiliary admixture can effectively reduce the impact of sudden rain after high temperature in summer on the thermal insulation performance of the gypsum thermal insulation mortar.

[0095] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A gypsum thermal insulation mortar, characterized in that: The invention is prepared from raw materials including the following components: 700-1000 parts by weight of gypsum powder; 100-200 parts of vitrified microspheres; 2-3 parts of cellulose; 2-3 parts of thixotropic agent; 1-3 parts of polypropylene fiber; 5-9 parts of latex powder; 1-2 parts of retarder; 50-80 parts of auxiliary admixture.

2. A gypsum thermal insulation mortar according to claim 1, characterized in that: The auxiliary admixture is prepared from lauryl alcohol ester, polyvinyl chloride resin, sodium citrate, choline chloride, sodium silicate nonahydrate and quicklime.

3. A gypsum thermal insulation mortar according to claim 2, characterized in that: The auxiliary admixture is prepared by the following process steps: dodecyl alcohol ester, sodium citrate, choline chloride, sodium silicate nonahydrate and quicklime are mixed and stirred evenly to prepare and obtain granules of the auxiliary admixture; polyvinyl chloride resin is heated to 100-130° C., the granules of the auxiliary admixture are immersed in the polyvinyl chloride resin, and the granules coated with the polyvinyl chloride resin are cooled to obtain the auxiliary admixture.

4. The gypsum thermal insulation mortar according to claim 2, characterized in that: The components of the auxiliary additive are preferably 5-8 parts of dodecyl alcohol ester and 30-50 parts of sodium citrate; 5-8 parts of choline chloride; 15-20 parts of sodium silicate nonahydrate; 15-18 parts of quicklime.

5. The gypsum thermal insulation mortar according to claim 1, characterized in that: The viscosity of the cellulose is 80,000-120,000.

6. A process for preparing a gypsum thermal insulation mortar according to any one of claims 1 to 5, characterized in that: The preparation method comprises the following process steps: gypsum powder, vitrified microspheres, cellulose, thixotropic agent, polypropylene fiber, latex powder and retarder are mixed in proportion and stirred evenly, the rotation speed is controlled to be 100-300r / min, after stirring for 5-10min, auxiliary admixture is added in proportion, stirred again for 1-2min, the rotation speed is controlled to be 10-30r / min, and the gypsum thermal insulation mortar is obtained after mixing evenly.

7. The preparation process of a gypsum thermal insulation mortar according to claim 6, characterized in that: The water content of the gypsum thermal insulation mortar during the mixing process is not higher than 5%.

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