Aerogel thermal insulation composite slurry, preparation method and application thereof

Abstract

The application belongs to the field of thermal insulation slurries, and particularly relates to an aerogel thermal insulation composite slurry, a preparation method and application thereof. The application provides an aerogel thermal insulation composite slurry, which comprises silica aerogel paste, polymer emulsion, white cement and filler; the silica aerogel paste comprises silica aerogel paste A and silica aerogel paste B; the silica aerogel paste A comprises silica aerogel A; the silica aerogel paste B comprises silica aerogel B; and the particle size of the silica aerogel A is smaller than that of the silica aerogel B. The aerogel thermal insulation composite slurry prepared by the application has the functions of wall leveling, waterproofing, reinforcement, crack resistance, mold resistance and the like, and has good thermal insulation performance.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of thermal insulation slurries, and particularly relates to an aerogel thermal insulation composite slurry as well as a preparation method and application thereof. BACKGROUND

[0002] At present, the commonly used EPS and XPS board thin-plastered external wall thermal insulation system and polyurethane rigid foaming external wall thermal insulation system all have problems such as low fireproof grade, poor safety, and serious pollution; the inorganic thermal insulation materials such as foamed cement board and vitrified microbead thermal insulation mortar also have problems such as high thermal conductivity, poor thermal insulation effect, and difficulty in meeting the requirements of the specified energy-saving indicators. The existing technology improves the thermal insulation performance by coating the inorganic thermal insulation material on the putty layer to obtain a thermal insulation coating or an external wall thermal insulation system; however, the steps are complicated, the occupied area is large, and the adhesion between the layers is poor, which reduces the thermal insulation performance of the wall; the thermal insulation performance of the existing putty layer slurry is poor. SUMMARY

[0003] Therefore, the technical problems to be solved by the present application are to overcome the defects that the thermal insulation performance of the putty layer slurry in the prior art needs to be further improved, so as to provide an aerogel thermal insulation composite slurry as well as a preparation method and application thereof.

[0004] To this end, the present application provides the following technical solutions.

[0005] The present application provides an aerogel thermal insulation composite slurry, which comprises silica aerogel paste, polymer emulsion, white cement and filler.

[0006] The silica aerogel paste comprises silica aerogel paste A and silica aerogel paste B, the silica aerogel paste A comprises silica aerogel A, the silica aerogel paste B comprises silica aerogel B, and the particle size of the silica aerogel A is smaller than that of the silica aerogel B.

[0007] In an alternative embodiment, the solid content of the silica aerogel paste A is 20-30%;

[0008] In an alternative embodiment, the D90 of the silica aerogel A is 20-40 μm;

[0009] In an alternative embodiment, the solid content of the silica aerogel paste B is 20-30%;

[0010] In an alternative embodiment, the D90 of the silica aerogel B is 60-80 μm.

[0011] The porosity of the silica aerogel A is greater than or equal to 98%, and the tap density is 0.05-0.1 g / cm 3, and the thermal conductivity is 0.010-0.025 W / (m·K); the density is 0.45-0.55 g / cm 3 .

[0012] The porosity of the silica aerogel B is ≥98%, and the tap density is 0.05-0.1 g / cm 3 , and the thermal conductivity is 0.010-0.025 W / (m·K); the density is 0.45-0.55 g / cm 3 .

[0013] In an alternative embodiment, the mass ratio of the silica aerogel paste A, the silica aerogel paste B and the polymer emulsion is (10-30):(10-30):(30-40);

[0014] In an alternative embodiment, the mass ratio of the white cement and the filler is (30-40):(60-90);

[0015] In an alternative embodiment, the polymer emulsion comprises at least one of an acrylic emulsion, a vinyl acetate emulsion and a silicone-acrylate emulsion. It is to be noted that the polymer emulsion is commercially available and is not specifically limited.

[0016] Preferably, the silicone-acrylate emulsion is an organosilicon-modified silicone-acrylate emulsion.

[0017] The organosilicon-modified silicone-acrylate emulsion is a functional emulsion formed by core-shell coating polymerization of an organosilicon monomer (such as methyltrimethoxysilane, vinyltriethoxysilane, etc.) containing an unsaturated bond and an acrylic monomer, and has better water resistance and weather resistance. The organosilicon-modified silicone-acrylate emulsion is commercially available.

[0018] In an alternative embodiment, the aerogel thermal insulation composite slurry comprises a solvent and / or a first auxiliary agent;

[0019] Preferably, the solvent comprises water;

[0020] Preferably, the mass ratio of the polymer emulsion, the solvent and the first auxiliary agent is (30-40):(30-40):(1-3);

[0021] Preferably, the first auxiliary agent comprises at least one of a defoaming agent and a mildew-proof agent;

[0022] Preferably, the defoaming agent comprises at least one of a mineral oil type defoaming agent, an organosilicon type defoaming agent, a polyether type defoaming agent, a polyether-modified polysiloxane type defoaming agent and a biological enzyme type defoaming agent;

[0023] Preferably, the defoaming agent is a mixture of a mineral oil type defoaming agent and an organosilicon type defoaming agent;

[0024] Preferably, the mass ratio of the mineral oil type defoaming agent and the silicone type defoaming agent is (1-3): 1;

[0025] Preferably, the antifungal agent comprises an organic antifungal agent;

[0026] Preferably, the organic antifungal agent comprises at least one of octyl isothiazolinone, dichloro-N-octyl-4-isothiazolinone, benzisothiazolinone and butyl benzisothiazolinone.

[0027] In an alternative embodiment, the aerogel thermal insulation composite slurry further comprises a second auxiliary agent; the second auxiliary agent comprises a thickening agent;

[0028] Preferably, the thickening agent comprises a water-soluble polymer synthetic thickening agent;

[0029] Preferably, the water-soluble polymer synthetic thickening agent comprises at least one of a cellulose thickening agent and an associative thickening agent;

[0030] Preferably, the cellulose thickening agent comprises at least one of hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose;

[0031] Preferably, the cellulose thickening agent is hydroxypropyl methyl cellulose;

[0032] Preferably, the mass ratio of the white cement and the thickening agent is (30-40):(1-10).

[0033] In an alternative embodiment, the particle size of the white cement is 100-600 mesh;

[0034] Preferably, the filler comprises at least one of quartz powder, heavy calcium and grey calcium powder;

[0035] Preferably, the filler comprises quartz powder, heavy calcium and grey calcium powder in a mass ratio of (2-3):(2-3):(2-3);

[0036] Preferably, the particle size of the quartz powder is 100-600 mesh;

[0037] Preferably, the particle size of the heavy calcium is 100-600 mesh;

[0038] Preferably, the particle size of the grey calcium powder is 100-600 mesh.

[0039] The application provides a kind of preferably aerogel heat preservation composite slurry, including mass ratio (10-30):(10-30):(30-40):(30-40):(1-3) of silica aerogel paste A, silica aerogel paste B, polymer emulsion, solvent, first auxiliary agent;It also includes mass ratio (30-40):(20-30):(20-30):(20-30):(1-10) of white cement, quartz powder, heavy calcium, ash calcium powder and thickening agent.

[0040] The application also provides a kind of preparation method of aerogel heat preservation composite slurry, comprising the following steps:

[0041] (1) preparation A component: first stirring of polymer emulsion, second stirring is added to silica aerogel paste A and silica aerogel paste B, silica aerogel paste A includes silica aerogel A, silica aerogel paste B includes silica aerogel B, and the particle size of silica aerogel A is less than that of silica aerogel B;

[0042] (2) preparation B component: white cement and filler are mixed uniformly;

[0043] (3) B component is added to A component, and dispersion.

[0044] In an alternative embodiment, the preparation method of the silica aerogel paste A comprises: first mixing of silica aerogel A and water;

[0045] Preferably, the mass ratio of silica aerogel A and water is (1-3):(4-7);

[0046] Preferably, the rotation speed of the first mixing is 1000-4000 rpm;

[0047] Preferably, the first mixing time is 5-20 min;

[0048] Preferably, the first mixing further comprises adding dispersant;

[0049] Preferably, based on the total mass of silica aerogel A and water, the amount of dispersant added is 0.3-0.8%;

[0050] In an alternative embodiment, the preparation method of the silica aerogel paste B comprises: second mixing of silica aerogel B with D90 of 60-80 μm and water;

[0051] Preferably, the mass ratio of silica aerogel B and water is (1-3):(4-7);

[0052] Preferably, the rotation speed of the second mixing is 1000-4000 rpm;

[0053] Preferably, the second mixing time is 5-20 min.

[0054] Preferably, the second mixing further comprises adding a dispersant.

[0055] Preferably, the dispersant is added in an amount of 0.3-0.8% based on the total mass of silica aerogel B and water.

[0056] The dispersant comprises at least one of tegos 750W, HLD-8K / S, SYZ-84190, BYK-190.

[0057] Preferably, the dispersant is tegos 750W.

[0058] In an alternative embodiment, the first stirring speed is 200-400 rpm.

[0059] In an alternative embodiment, the second stirring speed is 600-1000 rpm.

[0060] In an alternative embodiment, the dispersing speed is 1000-2000 rpm.

[0061] In an alternative embodiment, the dispersing time is 30-60 min.

[0062] In an alternative embodiment, the first stirring further comprises adding a solvent.

[0063] Preferably, the solvent comprises water.

[0064] In an alternative embodiment, the second stirring further comprises adding a first additive.

[0065] In an alternative embodiment, the preparing B component further comprises adding a second additive.

[0066] The application further provides the use of the above-mentioned aerogel thermal insulation composite slurry or the aerogel thermal insulation composite slurry prepared by the above-mentioned method in building external walls.

[0067] The application further can use the aerogel thermal insulation composite slurry and the external wall thermal insulation system in combination to improve the thermal insulation performance.

[0068] The application has the following advantages:

[0069] 1.The aerogel thermal insulation composite paste provided by the present application comprises silica aerogel paste, polymer emulsion, white cement and filler; the silica aerogel paste comprises silica aerogel paste A and silica aerogel paste B; the silica aerogel paste A comprises silica aerogel A; the silica aerogel paste B comprises silica aerogel B; and the particle size of the silica aerogel A is smaller than that of the silica aerogel B.The aerogel thermal insulation composite paste prepared by the present application has the functions of wall leveling, waterproofing, reinforcement, crack resistance, mold resistance and the like of conventional putty, and has good thermal insulation performance; compared with traditional putty paste, the density is lower, the coating on the building has little effect on the strength, and the safety factor is higher; and the paste has better thermal insulation effect, and the thermal conductivity is as low as 0.08-0.12 W / (m·K).The particle size of the silica aerogel A is smaller than that of the silica aerogel B, so that the silica aerogel A is filled in the gap of the silica aerogel B, is densely stacked to increase the heat conduction path, and the thermal conductivity is further reduced, so that the thermal insulation effect of the paste can be improved.The silica aerogel in the aerogel thermal insulation composite paste provided by the present application is in the form of paste, so that the amount of silica aerogel added is higher, the thermal conductivity of the composite paste is lower, and the thermal insulation effect is better.

[0070] The prior art coats thermal insulation paint on the putty layer, and then makes an external wall thermal insulation system, which is complicated and difficult to construct, and the bonding force between the layers is poor, so that the thermal insulation performance is poor; after the putty layer is made by using the aerogel thermal insulation composite paste provided by the present application, the external wall thermal insulation system can be directly made, without the need for coating thermal insulation paint, the steps are simple, the floor area and space can be reduced, the bonding force between the putty layer and the external wall thermal insulation system is better, and the thermal insulation performance is improved.

[0071] 2.The preparation method of the aerogel thermal insulation composite paste provided by the present application, which can quickly prepare the aerogel thermal insulation composite paste by preparing A component and B component respectively, mixing the dry materials of the B component uniformly, and then adding the wet materials of the A component, so that the preparation time is greatly reduced, and the prepared aerogel thermal insulation composite paste has uniform component distribution and better thermal insulation performance.The silica aerogel powder is first made into paste, so that the compatibility of the aerogel particles and the matrix resin can be improved. DETAILED DESCRIPTION

[0072] The following examples are provided to better further understand the present application, and do not limit the content and protection scope of the present application, and do not constitute a limitation on the content and protection scope of the present application, and any person who obtains any product the same as or similar to the present application under the inspiration of the present application or by combining the present application with other prior art features falls within the protection scope of the present application.

[0073] The specific experimental steps or conditions are not specified in the examples, and the operation or conditions can be carried out according to the conventional experimental steps described in the literature in the art. The reagents or instruments used are not specified by the manufacturer, and are conventional reagent products that can be obtained by purchase.

[0074] Example 1

[0075] The present embodiment provides a preparation method of aerogel thermal insulation composite slurry, comprising the following steps:

[0076] (1) 30 g of silica aerogel powder A with a D90 of 30 μm, 70 g of water and 1.95 g of tego 750W were mixed and stirred at 2000 rpm for 10 min to prepare a silica aerogel paste A; 30 g of silica aerogel powder B with a D90 of 70 μm, 70 g of water and 1.95 g of tego 750W were mixed and stirred at 2000 rpm for 10 min to prepare a silica aerogel paste B.

[0077] (2) 30 parts of acrylic emulsion and 30 parts of water were placed in a high-speed dispersing machine and stirred at 200 rpm, and 10 parts of silica aerogel paste A, 30 parts of silica aerogel paste B were added successively with a spatula; 1 part of mineral oil type defoaming agent and 1 part of octyl isothiazolinone were added, and the stirring speed was increased to 600 rpm to obtain component A.

[0078] (3) 30 parts of 500 mesh white cement, 25 parts of 500 mesh quartz powder, 20 parts of 500 mesh heavy calcium, 20 parts of 500 mesh gray calcium powder and 5 parts of hydroxypropyl methyl cellulose were mixed uniformly to obtain component B.

[0079] (4) The component A was placed in a high-speed dispersing machine and stirred at 500 rpm, and the component B was added and the stirring speed was gradually increased to 1200 rpm, and stirred for 30 min to obtain an aerogel thermal insulation composite slurry.

[0080] Example 2

[0081] The present embodiment provides a preparation method of aerogel thermal insulation composite slurry, comprising the following steps:

[0082] (1) 30 g of silica aerogel powder A with a D90 of 20 μm, 70 g of water and 1.95 g of HLD-8K / S were mixed and stirred at 1000 rpm for 5 min to prepare a silica aerogel paste A; 30 g of silica aerogel powder B with a D90 of 80 μm, 70 g of water and 1.95 g of HLD-8K / S were mixed and stirred at 1000 rpm for 5 min to prepare a silica aerogel paste B.

[0083] (2) According to parts by weight, 30 parts of vinyl acetate emulsion and 30 parts of water are placed in a high-speed dispersion machine, stirred at 200 rpm, and 20 parts of silica aerogel paste A, 20 parts of silica aerogel paste B are added successively with a scraper; then 1 part of silicone antifoaming agent, 1 part of octyl isothiazolinone are added, and the stirring speed is increased to 600 rpm to obtain A component.

[0084] (3) According to parts by weight, 30 parts of 400 mesh white cement, 25 parts of 400 mesh quartz powder, 20 parts of 400 mesh heavy calcium, 20 parts of 400 mesh calcium powder and 5 parts of hydroxymethyl cellulose are mixed uniformly to obtain B component.

[0085] (4) The A component is placed in a high-speed dispersion machine and stirred at 500 rpm, the B component is added and the stirring speed is gradually increased to 1200 rpm, and stirred for 30 min; an aerogel thermal insulation composite slurry is obtained.

[0086] Example 3

[0087] The present embodiment provides a preparation method of an aerogel thermal insulation composite slurry, comprising the following steps:

[0088] (1) 30g of silica aerogel powder A with D90 of 40μm, 70g of water and 1.95g of BYK-190 are mixed at 3000rpm for 15min to prepare silica aerogel paste A; 30g of silica aerogel powder B with D90 of 60μm, 70g of water and 1.95g of BYK-190 are mixed at 3000rpm for 15min to prepare silica aerogel paste B.

[0089] (2) According to parts by weight, 30 parts of silicone modified silicone-acrylate emulsion and 30 parts of water are placed in a high-speed dispersion machine, stirred at 200 rpm, and 30 parts of silica aerogel paste A, 10 parts of silica aerogel paste B are added successively with a scraper; then 1 part of a mixture of mineral oil type antifoaming agent and silicone type antifoaming agent, 1 part of octyl isothiazolinone are added, and the stirring speed is increased to 600 rpm to obtain A component; the mass ratio of mineral oil type antifoaming agent and silicone type antifoaming agent is 1:1;

[0090] (3) According to parts by weight, 30 parts of 600 mesh white cement, 20 parts of 600 mesh quartz powder, 24 parts of 600 mesh heavy calcium, 25 parts of 600 mesh calcium powder and 1 part of hydroxypropyl methyl cellulose are mixed uniformly to obtain B component.

[0091] (4) The A component is placed in a high-speed dispersion machine and stirred at 500 rpm, the B component is added and the stirring speed is gradually increased to 1200 rpm, and stirred for 30 min; an aerogel thermal insulation composite slurry is obtained.

[0092] Comparative Example 1

[0093] The comparative example provides a preparation method of the thermal insulation slurry, and the difference compared with example 1 is that the comparative example does not add the silica aerogel paste A; the added silica aerogel paste B is 40 parts.

[0094] Comparative example 2

[0095] The comparative example provides a preparation method of the thermal insulation slurry, and the difference compared with example 1 is that the comparative example does not add the silica aerogel paste B; the added silica aerogel paste A is 40 parts.

[0096] Comparative example 3

[0097] The comparative example provides a preparation method of the thermal insulation slurry, and the difference compared with example 1 is that the comparative example does not add the silica aerogel paste A and the silica aerogel paste B; the added acrylic emulsion is 40 parts; the added water is 40 parts.

[0098] Test example

[0099] The thermal insulation slurry prepared by examples 1-4 and comparative examples 1-4 is tested for performance, and the specific method is as follows:

[0100] (1) The thermal conductivity detection method: the method of GB / T10295-2008 is referred to for detection;

[0101] (2) The density detection method: the method of JG / T157-2009 is referred to for detection;

[0102] Table 1

[0103]

[0104] As shown in Table 1, the aerogel thermal insulation composite slurry provided by the present application has low thermal conductivity, has more excellent thermal insulation effect, has lower density, and has less influence on the building strength, and has higher safety factor.

[0105] Specifically, the comparative examples 1-2 only add a single particle size of silica aerogel paste, and the thermal conductivity is higher and the thermal insulation effect is worse; the comparative example 3 does not add the silica aerogel paste, and the density and the thermal conductivity are greatly increased.

[0106] Obviously, the above examples are only examples for clearly illustrating, and do not limit the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An aerogel thermal insulation composite slurry, characterized by, The silica aerogel paste comprises silica aerogel paste A and silica aerogel paste B, the silica aerogel paste A comprises silica aerogel A, the silica aerogel paste B comprises silica aerogel B, and the particle size of the silica aerogel A is smaller than that of the silica aerogel B. The solid content of the silica aerogel paste A is 20-30%. The D90 of the silica aerogel A is 20-40 μm. The solid content of the silica aerogel paste B is 20-30%. The D90 of the silica aerogel B is 60-80 μm. The mass ratio of the silica aerogel paste A, the silica aerogel paste B and the polymer emulsion is (10-30):(10-30):(30-40). The mass ratio of the white cement and the filler is (30-40):(60-90). The polymer emulsion comprises at least one of acrylic emulsion, vinyl acetate emulsion and silicone-acrylate emulsion. The aerogel thermal insulation composite paste further comprises a second additive; the second additive comprises a thickening agent.

2. The aerogel thermal insulation composite slurry of claim 1, wherein, The mass ratio of the polymer emulsion, the solvent and the first additive is (30-40):(30-40):(1-3).

3. The aerogel thermal insulation composite slurry of claim 2, wherein, The first additive comprises at least one of defoaming agent and antifungal agent.

4. The aerogel thermal insulation composite slurry of claim 3, wherein, The defoaming agent comprises at least one of mineral oil type defoaming agent, silicone type defoaming agent, polyether type defoaming agent, polyether modified polysiloxane type defoaming agent and biological enzyme type defoaming agent.

5. The aerogel thermal insulation composite slurry of claim 4, wherein, The defoaming agent is a mixture of mineral oil type defoaming agent and silicone type defoaming agent.

6. The aerogel thermal insulation composite slurry of claim 5, wherein, The mass ratio of the mineral oil type defoaming agent and the silicone type defoaming agent is (1-3):

1.

7. The aerogel thermal insulation composite slurry of claim 6, wherein, The antifungal agent comprises organic antifungal agent.

8. The aerogel thermal insulation composite slurry of claim 7, wherein, The organic antifungal agent comprises at least one of octyl isothiazolinone, dichloro-N-octyl-4-isothiazolinone, benzisothiazolinone and butyl benzisothiazolinone.

9. The aerogel thermal insulation composite slurry of claim 8, wherein, The aerogel thermal insulation composite paste further comprises a second additive; the second additive comprises a thickening agent.

10. The aerogel thermal insulation composite slurry of claim 1, wherein, The thickening agent comprises water-soluble polymer synthetic thickening agent.

11. The aerogel thermal insulation composite slurry of claim 10, wherein, The water-soluble polymer synthetic thickening agent comprises at least one of cellulose thickening agent and associative thickening agent.

12. The aerogel thermal insulation composite slurry of claim 11, wherein, The cellulose thickening agent comprises at least one of hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose.

13. The aerogel thermal insulation composite slurry of claim 12, wherein, The cellulose thickening agent is hydroxypropyl methyl cellulose.

14. The aerogel thermal insulation composite slurry of claim 13, wherein, The mass ratio of the white cement and the thickening agent is (30-40):(1-10).

15. The aerogel thermal insulation composite slurry of claim 14, wherein, The particle size of the white cement is 100-600 mesh.

16. The aerogel thermal insulation composite slurry of claim 1, wherein, The filler comprises at least one of quartz powder, heavy calcium and lime calcium powder.

17. The aerogel thermal insulation composite slurry of claim 16, wherein, The filler comprises quartz powder, heavy calcium and lime calcium powder with a mass ratio of (2-3):(2-3):(2-3).

18. The aerogel thermal insulation composite slurry of claim 17, wherein, The particle size of the quartz powder is 100-600 mesh.

19. The aerogel thermal insulation composite slurry of claim 18, wherein, The particle size of the heavy calcium is 100-600 mesh.

20. The aerogel thermal insulation composite paste of claim 19, wherein, The particle size of the lime calcium powder is 100-600 mesh.

21. The aerogel thermal insulation composite slurry of claim 20, wherein, The method comprises the following steps:

22. A method of making an aerogel thermal insulation composite slurry according to any one of claims 1-21, characterized in that, ​ (1) preparing A component: stirring the polymer emulsion first, then adding silica aerogel paste A and silica aerogel paste B second, silica aerogel paste A comprises silica aerogel A, silica aerogel paste B comprises silica aerogel B, the particle size of silica aerogel A is smaller than that of silica aerogel B; (2) preparing B component: mixing white cement and filler uniformly; (3) adding B component to A component and dispersing.

23. The method of claim 22, wherein, The preparation method of the silica aerogel paste A comprises: mixing silica aerogel A and water first.

24. The method of claim 23, wherein, The mass ratio of silica aerogel A to water is (1-3):(4-7).

25. The method of claim 24, wherein, The rotation speed of the first mixing is 1000-4000 rpm.

26. The method of claim 25, wherein, The time of the first mixing is 5-20 min.

27. The method of claim 26, wherein, The first mixing further comprises adding a dispersant.

28. The method of claim 22, wherein, The preparation method of the silica aerogel paste B comprises: mixing silica aerogel B with D90 of 60-80 μm and water second.

29. The method of claim 28, wherein, The mass ratio of silica aerogel B to water is (1-3):(4-7).

30. The method of claim 29, wherein, The rotation speed of the second mixing is 1000-4000 rpm.

31. The method of claim 30, wherein, The time of the second mixing is 5-20 min.

32. The method of claim 31, wherein, The second mixing further comprises adding a dispersant.

33. The method of claim 22, wherein the method is carried out at a temperature of about 20°C to about 30°C. The rotation speed of the first stirring is 200-400 rpm; and / or, The rotation speed of the second stirring is 600-1000 rpm; and / or, The rotation speed of the dispersing is 1000-2000 rpm; and / or, The time of the dispersing is 30-60 min; and / or, The first stirring further comprises adding a solvent; and / or, The second stirring further comprises adding a first additive; and / or, The preparation of B component further comprises adding a second additive.

34. The use of the aerogel thermal insulation composite slurry of any one of claims 1-21 or the aerogel thermal insulation composite slurry prepared by the preparation method of any one of claims 22-33 in building external walls.

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