Gypsum-based thermal and sound insulation floor screed and method for its production

Abstract

The application relates to the technical field of gypsum mortar, and discloses a gypsum-based heat-insulating and sound-insulating floor mortar and a preparation method thereof, the gypsum-based heat-insulating and sound-insulating floor mortar comprises alpha gypsum, a mixed foaming agent, modified polystyrene particles, closed-pore vitrified microbeads and an additive; the modified polystyrene particles are prepared through a cross-linking and emulsification process of modified SiO2 fibers and cross-linking monomers. The gypsum-based heat-insulating and sound-insulating floor mortar adopts alpha gypsum as a cementing material, does not need to add cement, and introduces components such as modified polystyrene particles and closed-pore vitrified microbeads, so that the floor mortar has stronger absolute dry strength, good heat-insulating and sound-insulating effects, is convenient to construct and has a long service life.

Description

Technical Field

[0001] This invention relates to the field of gypsum mortar technology, and more specifically, to a gypsum-based thermal insulation and soundproofing floor mortar and its preparation method. Background Technology

[0002] Mortar flooring is a shorthand for epoxy resin mortar flooring. It is a type of grouting material that sets quickly and has high viscosity. It is characterized by its variety of forms, convenient curing, strong adhesion, low shrinkage, strong mechanical properties, dimensional stability, and durability. It is widely used for flooring in special places such as supermarkets, lobbies, and warehouses.

[0003] Currently, high-performance floor mortars mostly use β-type hemihydrate building gypsum as the main cementitious material, with cement or other fillers added, along with a certain amount of admixtures, to prepare a dry powder. A certain amount of water is then added and mixed to form a slurry. Finally, a large amount of polystyrene particles are added and mixed evenly. Existing floor mortars require the introduction of cement as a filler component; otherwise, it is difficult to meet the mortar's filling requirements. However, cement reacts slowly with gypsum to produce expansive ettringite, which can cause expansion and cracking in the later stages of mortar curing, resulting in low oven-dry strength.

[0004] Therefore, there is an urgent need for a gypsum base floor mortar with better oven-drying properties. Summary of the Invention

[0005] The technical problem to be solved by this invention:

[0006] Currently, cement is often used as a filler component in existing floor mortars. When gypsum is used as the base material, the cement reacts slowly with the gypsum to produce expansive ettringite, which can cause the floor mortar to expand and crack in the later stages of molding, resulting in low oven-dry strength and thus affecting its construction effect and service life.

[0007] The technical solution adopted in this invention is as follows:

[0008] This invention provides a gypsum-based thermal insulation and soundproofing floor mortar, comprising α-type gypsum, a mixed foaming agent, modified polystyrene particles, closed-cell vitrified microspheres, and additives;

[0009] The modified polystyrene particles are prepared by crosslinking and emulsification processes using modified SiO2 fibers and crosslinking monomers.

[0010] Preferably, the mixed foaming agent comprises an organic sulfonate foaming agent and a protein foaming agent in a mass ratio of 0.8-1.2:1.

[0011] Preferably, the crosslinking monomers include, but are not limited to, one or more of hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, and glycidyl methacrylate.

[0012] Preferably, the method for preparing the modified polystyrene particles includes the following steps:

[0013] A1. Take polystyrene, add SiO2 fibers, heat and react to obtain modified SiO2 fibers;

[0014] A2 takes modified SiO2 fiber, crosslinking monomer and crosslinking agent, heats and reacts them, then emulsifies, dries and granulates to obtain modified polystyrene particles.

[0015] Preferably, in step A1, the heating temperature is 60-80℃ and the reaction time is 2-7h.

[0016] Preferably, in step A2, the heating temperature is 70-100℃ and the reaction time is 20-30h.

[0017] This invention also provides a method for preparing the above-mentioned gypsum-based thermal insulation and soundproofing floor mortar, comprising the following steps:

[0018] S1 Take α-type gypsum and additives, mix them, and make a dry powder;

[0019] S2 Take organic sulfonate foaming agent and protein foaming agent respectively, mix them, add water, stir to dissolve, and prepare foaming liquid;

[0020] S3: Prepare water separately, add modified polystyrene particles and dry powder in sequence, and stir evenly; then add closed-cell vitrified microspheres and stir evenly; finally add foaming liquid and stir evenly to obtain gypsum-based thermal insulation and soundproof floor mortar.

[0021] Preferably, in step S1, the additives include water-reducing agents, cellulose ethers, redispersible latex powder, polyacrylamide, and gypsum retarder.

[0022] Preferably, in step S1, the dry powder comprises, by weight, 100 parts of α-type high-strength gypsum, 0.1-0.3 parts of water-reducing agent, 0.1-0.3 parts of redispersible latex powder, 0.08-0.1 parts of cellulose ether, 0.02-0.04 parts of polyacrylamide, and 0.01-0.02 parts of gypsum retarder.

[0023] Preferably, in step S3, the ratio of dry powder to foaming liquid, modified polystyrene particles, closed-cell vitrified microspheres, and water by mass is 1:0.016-0.024:0.01-0.25:0.008-0.012:0.4-0.5.

[0024] The beneficial effects of this invention are as follows:

[0025] This invention uses α-type gypsum as a cementing material, eliminating the need for cement and requiring less water. The resulting gypsum mortar exhibits significantly higher oven-dry strength and reduces cracking during the later drying stages and application. Furthermore, by introducing modified polystyrene particles obtained through a modification process, combined with components such as closed-cell vitrified microspheres, the spatial structural diversity of the material is enhanced, forming a three-dimensional structural feature. This results in floor mortar with superior thermal insulation and soundproofing effects, while also being easy to apply and having a long service life. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0027] This invention provides a gypsum-based thermal insulation and soundproofing floor mortar, comprising α-type gypsum, mixed foaming agent, modified polystyrene particles, closed-cell vitrified microspheres, and additives;

[0028] The mixed foaming agent includes an organic sulfonate foaming agent and a protein foaming agent with a mass ratio of 0.8-1.2:1.

[0029] The method for preparing modified polystyrene particles in this invention includes the following steps:

[0030] A1. Take polystyrene, add SiO2 fibers, and heat to modify it to obtain modified SiO2 fibers.

[0031] A2 is prepared by mixing modified SiO2 fibers, crosslinking monomers, and crosslinking agents in a mass ratio of 1:0.8-2:0.01-0.15, heating and reacting the mixture, followed by emulsification, drying, and granulation to obtain modified polystyrene particles.

[0032] The crosslinking monomers include, but are not limited to, one or more of hydroxypropyl acrylate, hydroxyethyl methacrylate, and glycidyl methacrylate; the crosslinking agent can be selected from one or more of N,N-methyleneacrylamide, ethylene glycol dimethacrylate, and epichlorohydrin.

[0033] In this invention, the additives include water-reducing agents, cellulose ethers, redispersible latex powder, polyacrylamide, and gypsum retarder.

[0034] This invention also provides a method for preparing the above-mentioned gypsum-based thermal insulation and soundproofing floor mortar, comprising the following steps:

[0035] S1 Take α-type gypsum and additives, mix them, and make a dry powder;

[0036] The dry powder, by weight, includes 100 parts of α-type high-strength gypsum, 0.1-0.3 parts of water-reducing agent, 0.1-0.3 parts of redispersible latex powder, 0.08-0.1 parts of cellulose ether, 0.02-0.04 parts of polyacrylamide, and 0.01-0.02 parts of gypsum retarder.

[0037] S2 Take organic sulfonate foaming agent and protein foaming agent respectively, mix them, add water, stir to dissolve, and prepare foaming liquid;

[0038] In this process, the mass ratio of organic sulfonate foaming agent to protein foaming agent is 0.8-1.2:1, and the mass ratio of the total mass of organic sulfonate foaming agent and protein foaming agent to water is 0.04-0.06:1.

[0039] S3 prepares a certain amount of water, adds modified polystyrene particles and dry powder in sequence, and stirs evenly; then adds closed-cell vitrified microspheres and stirs evenly; finally adds foaming liquid and stirs evenly to obtain gypsum-based thermal insulation and soundproof floor mortar.

[0040] In this process, the mass ratio of dry powder to foaming liquid, modified polystyrene particles, closed-cell vitrified microspheres, and water is 1:0.016-0.024:0.01-0.25:0.008-0.012:0.4-0.5.

[0041] The gypsum-based thermal insulation and soundproofing floor mortar of this invention uses α-type gypsum as a gelling material, eliminating the need for cement or other fillers. Through the synergistic effect of the raw materials, it achieves the thermal insulation and soundproofing effects of the floor mortar. Its oven-dry compressive strength can reach over 3MPa, and its dry density can be as low as 400kg / m³. 3 Below, the flowability reaches 200mm or more.

[0042] <Example>

[0043] Example 1

[0044] (1) Preparation of modified polystyrene particles:

[0045] SiO2 fibers were added to an ethanol-water solution, ensuring the ethanol-water solution completely submerged the SiO2 fibers, and then ultrasonically dispersed. Polystyrene was then added, heated to 70°C, stirred for 4 hours, and cooled to obtain modified SiO2 fibers.

[0046] Modified SiO2 fiber, hydroxyethyl methacrylate, and N,N-methyleneacrylamide were taken at a mass ratio of 4:6.5:0.2, stirred evenly, heated to 80°C, and reacted for 25 hours. 9.3 wt% sodium dodecyl sulfate and cyclohexane were added, and stirred at 50°C for 30 minutes to form an emulsion. Then, 4.5 wt% benzoyl peroxide was added, heated to about 20°C, stirred, and then separated and freeze-dried to produce modified polystyrene granules.

[0047] (2) Take 100 parts by weight of α-type high-strength gypsum, 0.3 parts by weight of water-reducing agent, 0.3 parts by weight of redispersible latex powder, 0.1 parts by weight of cellulose ether, 0.02 parts by weight of polyacrylamide and 0.01 parts by weight of gypsum retarder, mix them to make dry powder; then take organic sulfonate foaming agent and protein foaming agent in a mass ratio of 1:1, mix them, add water in a mass ratio of total mass of foaming agent to water of 0.05:1, stir to dissolve, and make foaming liquid;

[0048] Prepare 0.45 parts by weight of water, add 0.1 parts by weight of modified polystyrene particles and 1 part by weight of dry powder, and stir evenly; then add 0.01 parts by weight of closed-cell vitrified microspheres and stir evenly; finally add 0.02 parts by weight of foaming liquid and stir evenly to obtain gypsum-based thermal insulation and sound insulation floor mortar.

[0049] Example 2

[0050] (1) Preparation of modified polystyrene particles:

[0051] Take SiO2 fibers and add them to an ethanol-water solution, ensuring the ethanol-water solution covers the SiO2 fibers. Disperse the fibers using ultrasound. Then add polystyrene, heat to 60°C, stir and react for 5.5 hours, and cool to obtain modified SiO2 fibers.

[0052] Modified SiO2 fiber, hydroxyethyl methacrylate, and N,N-methyleneacrylamide were taken at a mass ratio of 4:6.5:0.2, stirred evenly, heated to 90℃, and reacted for 20h. 9.3wt% sodium dodecyl sulfate and cyclohexane were added, and stirred at 50℃ for 30min to form an emulsion. Then 4.5wt% benzoyl peroxide was added, heated to about 20℃, stirred, and then separated and freeze-dried to produce modified polystyrene granules.

[0053] (2) Take 100 parts by weight of α-type high-strength gypsum, 0.2 parts by weight of water-reducing agent, 0.2 parts by weight of redispersible latex powder, 0.1 parts by weight of cellulose ether, 0.02 parts by weight of polyacrylamide and 0.01 parts by weight of gypsum retarder, mix them to make dry powder; then take organic sulfonate foaming agent and protein foaming agent in a mass ratio of 1:1, mix them, add water in a mass ratio of total mass of foaming agent to water of 0.05:1, stir to dissolve, and make foaming liquid;

[0054] Prepare 0.45 parts by weight of water, add 0.1 parts by weight of modified polystyrene particles and 1 part by weight of dry powder, and stir evenly; then add 0.01 parts by weight of closed-cell vitrified microspheres and stir evenly; finally add 0.02 parts by weight of foaming liquid and stir evenly to obtain gypsum-based thermal insulation and sound insulation floor mortar.

[0055] Example 3

[0056] (1) Preparation of modified polystyrene particles:

[0057] SiO2 fibers were added to an ethanol-water solution, ensuring the ethanol-water solution completely submerged the SiO2 fibers, and then ultrasonically dispersed. Polystyrene was then added, heated to 70°C, stirred for 4 hours, and cooled to obtain modified SiO2 fibers.

[0058] Modified SiO2 fiber, hydroxypropyl acrylate, and N,N-methyleneacrylamide were taken at a mass ratio of 4:6.5:0.2, stirred evenly, heated to 80℃, and reacted for 25 h. 9.3 wt% sodium dodecyl sulfate and cyclohexane were added, and stirred at 50℃ for 30 min to form an emulsion. Then 4.5 wt% benzoyl peroxide was added, heated to about 20℃, stirred, and then separated and freeze-dried to produce modified polystyrene granules.

[0059] (2) Take 100 parts by weight of α-type high-strength gypsum, 0.1 parts by weight of water-reducing agent, 0.1 parts by weight of redispersible latex powder, 0.08 parts by weight of cellulose ether, 0.04 parts by weight of polyacrylamide and 0.02 parts by weight of gypsum retarder, mix them to make dry powder; then take organic sulfonate foaming agent and protein foaming agent in a mass ratio of 1:1, mix them, add water in a mass ratio of total mass of foaming agent to water of 0.05:1, stir to dissolve, and make foaming liquid;

[0060] Prepare 0.45 parts by weight of water, add 0.1 parts by weight of modified polystyrene particles and 1 part by weight of dry powder, and stir evenly; then add 0.01 parts by weight of closed-cell vitrified microspheres and stir evenly; finally add 0.02 parts by weight of foaming liquid and stir evenly to obtain gypsum-based thermal insulation and sound insulation floor mortar.

[0061] Example 4

[0062] (1) Preparation of modified polystyrene particles:

[0063] SiO2 fibers were added to an ethanol-water solution, ensuring the ethanol-water solution completely submerged the SiO2 fibers, and then ultrasonically dispersed. Polystyrene was then added, heated to 70°C, stirred for 4 hours, and cooled to obtain modified SiO2 fibers.

[0064] Modified SiO2 fiber, hydroxyethyl methacrylate, and N,N-methyleneacrylamide were taken at a mass ratio of 4:6.5:0.2, stirred evenly, heated to 80°C, and reacted for 25 hours. 9.3 wt% sodium dodecyl sulfate and cyclohexane were added, and stirred at 50°C for 30 minutes to form an emulsion. Then, 4.5 wt% benzoyl peroxide was added, heated to about 20°C, stirred, and then separated and freeze-dried to produce modified polystyrene granules.

[0065] (2) Take 100 parts by weight of α-type high-strength gypsum, 0.3 parts by weight of water-reducing agent, 0.3 parts by weight of redispersible latex powder, 0.1 parts by weight of cellulose ether, 0.02 parts by weight of polyacrylamide and 0.01 parts by weight of gypsum retarder, mix them to make dry powder; then take organic sulfonate foaming agent and protein foaming agent in a mass ratio of 1:1, mix them, add water in a mass ratio of total mass of foaming agent to water of 0.05:1, stir to dissolve, and make foaming liquid;

[0066] Prepare 0.45 parts by weight of water, add 0.15 parts by weight of modified polystyrene particles and 1 part by weight of dry powder, and stir evenly; then add 0.012 parts by weight of closed-cell vitrified microspheres and stir evenly; finally add 0.022 parts by weight of foaming liquid and stir evenly to obtain gypsum-based thermal insulation and soundproof floor mortar.

[0067] Example 5

[0068] (1) Preparation of modified polystyrene particles:

[0069] SiO2 fibers were added to an ethanol-water solution, ensuring the ethanol-water solution completely submerged the SiO2 fibers, and then ultrasonically dispersed. Polystyrene was then added, heated to 70°C, stirred for 4 hours, and cooled to obtain modified SiO2 fibers.

[0070] Modified SiO2 fiber, hydroxyethyl methacrylate, and N,N-methyleneacrylamide were taken at a mass ratio of 4:6.5:0.2, stirred evenly, heated to 80°C, and reacted for 25 hours. 9.3 wt% sodium dodecyl sulfate and cyclohexane were added, and stirred at 50°C for 30 minutes to form an emulsion. Then, 4.5 wt% benzoyl peroxide was added, heated to about 20°C, stirred, and then separated and freeze-dried to produce modified polystyrene granules.

[0071] (2) Take 100 parts by weight of α-type high-strength gypsum, 0.2 parts by weight of water-reducing agent, 0.3 parts by weight of redispersible latex powder, 0.08 parts by weight of cellulose ether, 0.03 parts by weight of polyacrylamide and 0.01 parts by weight of gypsum retarder, mix them to make dry powder; then take organic sulfonate foaming agent and protein foaming agent in a mass ratio of 1:1, mix them, add water at a mass ratio of total mass of foaming agent to water of 0.05:1, stir to dissolve, and make foaming liquid;

[0072] Prepare 0.45 parts by weight of water, add 0.05 parts by weight of modified polystyrene particles and 1 part by weight of dry powder, and stir evenly; then add 0.008 parts by weight of closed-cell vitrified microspheres and stir evenly; finally add 0.018 parts by weight of foaming liquid and stir evenly to obtain gypsum-based thermal insulation and soundproof floor mortar.

[0073] <Comparative Example>

[0074] Comparative Example 1 [Unmodified Polystyrene Particles]

[0075] Take 100 parts by weight of α-type high-strength gypsum, 0.3 parts by weight of water-reducing agent, 0.3 parts by weight of redispersible latex powder, 0.1 parts by weight of cellulose ether, 0.02 parts by weight of polyacrylamide, and 0.01 parts by weight of gypsum retarder, mix them, and prepare a dry powder. Separately, take organic sulfonate foaming agent and protein foaming agent at a mass ratio of 1:1, mix them, add water at a mass ratio of total mass of foaming agent to water of 0.05:1, stir to dissolve, and prepare a foaming liquid.

[0076] Prepare 0.45 parts by weight of water, add 1 part by weight of dry powder, and stir evenly; then add 0.01 parts by weight of closed-cell vitrified microspheres, and stir evenly; finally add 0.02 parts by weight of foaming liquid, and stir evenly to obtain gypsum floor mortar.

[0077] Comparative Example 2 [Non-closed-cell vitrified microspheres]

[0078] (1) Preparation of modified polystyrene particles:

[0079] SiO2 fibers were added to an ethanol-water solution, ensuring the ethanol-water solution completely submerged the SiO2 fibers, and then ultrasonically dispersed. Polystyrene was then added, heated to 70°C, stirred for 4 hours, and cooled to obtain modified SiO2 fibers.

[0080] Modified SiO2 fiber, hydroxyethyl methacrylate, and N,N-methyleneacrylamide were taken at a mass ratio of 4:6.5:0.2, stirred evenly, heated to 80°C, and reacted for 25 hours. 9.3 wt% sodium dodecyl sulfate and cyclohexane were added, and stirred at 50°C for 30 minutes to form an emulsion. Then, 4.5 wt% benzoyl peroxide was added, heated to about 20°C, stirred, and then separated and freeze-dried to produce modified polystyrene granules.

[0081] (2) Take 100 parts by weight of α-type high-strength gypsum, 0.3 parts by weight of water-reducing agent, 0.3 parts by weight of redispersible latex powder, 0.1 parts by weight of cellulose ether, 0.02 parts by weight of polyacrylamide and 0.01 parts by weight of gypsum retarder, mix them to make dry powder; then take organic sulfonate foaming agent and protein foaming agent in a mass ratio of 1:1, mix them, add water in a mass ratio of total mass of foaming agent to water of 0.05:1, stir to dissolve, and make foaming liquid;

[0082] Prepare 0.45 parts by weight of water, add 0.1 parts by weight of modified polystyrene granules and 1 part by weight of dry powder, and stir evenly; then add 0.02 parts by weight of foaming liquid, stir evenly, and obtain gypsum-based thermal insulation and sound insulation floor mortar.

[0083] Comparative Example 3

[0084] (1) Preparation of modified polystyrene particles:

[0085] SiO2 fibers were added to an ethanol-water solution, ensuring the ethanol-water solution completely submerged the SiO2 fibers, and then ultrasonically dispersed. Polystyrene was then added, heated to 70°C, stirred for 4 hours, and cooled to obtain modified SiO2 fibers.

[0086] Modified SiO2 fiber, hydroxyethyl methacrylate, and N,N-methyleneacrylamide were taken at a mass ratio of 4:6.5:0.2, stirred evenly, heated to 80°C, and reacted for 25 hours. 9.3 wt% sodium dodecyl sulfate and cyclohexane were added, and stirred at 50°C for 30 minutes to form an emulsion. Then, 4.5 wt% benzoyl peroxide was added, heated to about 20°C, stirred, and then separated and freeze-dried to produce modified polystyrene granules.

[0087] (2) Take 100 parts by weight of α-type high-strength gypsum, 0.3 parts by weight of water-reducing agent, 0.3 parts by weight of redispersible latex powder, 0.1 parts by weight of cellulose ether, 0.02 parts by weight of polyacrylamide and 0.01 parts by weight of gypsum retarder, mix them to make dry powder; then take inorganic foaming agent and water at a mass ratio of 0.05:1, stir and dissolve them to make foaming liquid;

[0088] Prepare 0.45 parts by weight of water, add 0.1 parts by weight of modified polystyrene particles and 1 part by weight of dry powder, and stir evenly; then add 0.01 parts by weight of closed-cell vitrified microspheres and stir evenly; finally add 0.02 parts by weight of foaming liquid and stir evenly to obtain gypsum-based thermal insulation and sound insulation floor mortar.

[0089] <Experimental Example>

[0090] Samples: Examples 1-5, Comparative Examples 1-3

[0091] Samples prepared in Examples 1-5 and Comparative Examples 1-3 were tested for strength and thermal insulation performance using the test methods required by JG / T266-2011 "Foamed Concrete". Impact sound insulation performance after molding was tested using the requirements of GB / T19889.6-2005 "Acoustic Buildings and Building Components Sound Insulation Measurement". The flowability of the samples was tested using the methods specified in JC / T 2326-2015 "Leveling Mortar for Buildings". Cracking was also observed after the samples were left to stand at room temperature for 6 months after molding. The test results were recorded and summarized, as shown in Table 1 below.

[0092] Table 1. Material property test results of different samples

[0093]

[0094] As shown in Table 1 above, compared with Comparative Examples 1-3, the mortars in Examples 1-5 have significantly lower dry densities, all around 400 kg / m³. 3 The impact sound insulation decibels in the following tests were significantly lower, and the thermal conductivity was higher than that of the mortars in Comparative Examples 1-3. This means that the sound insulation and thermal insulation performance of the gypsum-based floor mortars in Examples 1-5 are significantly better than those of the floor mortars in Comparative Examples 1-3. Therefore, this demonstrates that the gypsum-based thermal and sound insulation floor mortar proposed in this invention can solve the problem of poor sound insulation and thermal insulation performance in existing gypsum-based floor mortars.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A gypsum-based thermal insulation and soundproofing floor mortar, characterized in that, Including α-type gypsum, mixed foaming agent, modified polystyrene particles, closed-cell vitrified microspheres, and additives; The method for preparing the modified polystyrene particles includes the following steps: A1. Take polystyrene, add SiO2 fibers, heat and react to obtain modified SiO2 fibers; A2 takes modified SiO2 fiber, crosslinking monomer and crosslinking agent, heats and reacts them, then emulsifies, dries and granulates to obtain modified polystyrene particles; The gypsum-based thermal insulation and soundproofing floor mortar is prepared using the following method: S1 Take α-type gypsum and additives, mix them, and make a dry powder; S2 Take organic sulfonate foaming agent and protein foaming agent respectively, mix them, add water, stir to dissolve, and prepare foaming liquid; S3: Prepare water separately, add modified polystyrene particles and dry powder in sequence, and stir evenly; then add closed-cell vitrified microspheres and stir evenly; finally add foaming liquid and stir evenly to obtain gypsum-based thermal insulation and soundproof floor mortar. The additives include water-reducing agents, cellulose ethers, redispersible latex powder, polyacrylamide, and gypsum retarder; By weight, the dry powder comprises 100 parts of α-type high-strength gypsum, 0.1-0.3 parts of water-reducing agent, 0.1-0.3 parts of redispersible latex powder, 0.08-0.1 parts of cellulose ether, 0.02-0.04 parts of polyacrylamide, and 0.01-0.02 parts of gypsum retarder; By weight, the ratio of dry powder to foaming liquid, modified polystyrene particles, closed-cell vitrified microspheres, and water is 1:0.016-0.024:0.01-0.25:0.008-0.012:0.4-0.

5.

2. The gypsum-based thermal insulation and soundproofing floor mortar according to claim 1, characterized in that, The mixed foaming agent includes organic sulfonate foaming agent and protein foaming agent in a mass ratio of 0.8-1.2:

1.

3. The gypsum-based thermal insulation and soundproofing floor mortar according to claim 1, characterized in that, The crosslinking monomers include one or more of hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxyethyl acrylate, and glycidyl methacrylate.

4. The gypsum-based thermal insulation and soundproofing floor mortar according to claim 1, characterized in that, In step A1, the heating temperature is 60-80℃ and the reaction time is 2-7 hours.

5. The gypsum-based thermal insulation and soundproofing floor mortar according to claim 1, characterized in that, In step A2, the heating temperature is 70-100℃ and the reaction time is 20-30h.

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