Aerogel heat-preservation and heat-insulation composite slurry as well as preparation method and application thereof

Abstract

The invention belongs to the field of thermal insulation slurry, and particularly relates to aerogel thermal insulation composite slurry as well as a preparation method and application thereof. The invention provides aerogel heat-preservation and heat-insulation composite slurry. The aerogel heat-preservation and heat-insulation composite slurry is prepared from silicon dioxide aerogel paste, polymer emulsion, white cement and filler, the silicon dioxide aerogel paste material comprises a silicon dioxide aerogel paste material A and a silicon dioxide aerogel paste material B, the silicon dioxide aerogel paste material A comprises silicon dioxide aerogel A, the silicon dioxide aerogel paste material B comprises silicon dioxide aerogel B, and the particle size of the silicon dioxide aerogel A is smaller than that of the silicon dioxide aerogel B. The aerogel heat-preservation and heat-insulation composite slurry prepared by the invention not only has the conventional putty effects of wall leveling, water resistance, reinforcement, crack resistance, mildew resistance and the like, but also has better heat-preservation and heat-insulation performance.

Description

Technical Field

[0001] The invention belongs to the field of thermal insulation slurry, and specifically relates to an aerogel thermal insulation composite slurry and a preparation method and application thereof. Background Art

[0002] Currently, the commonly used EPS, XPS board thin plaster exterior wall insulation system and polyurethane rigid foam exterior wall insulation system all have problems such as low fire protection level, poor safety and serious pollution; inorganic insulation materials such as foamed cement board and vitrified micro-bead insulation mortar have problems such as high thermal conductivity, poor insulation effect and difficulty in meeting the required energy-saving index requirements. The existing technology improves the thermal insulation performance by applying thermal insulation coatings made of inorganic thermal insulation materials on the outside of the putty layer or making an exterior wall insulation system; but the steps are cumbersome, the floor space is large, and the bonding force between the layers is poor, which reduces the thermal insulation performance of the wall; the existing putty layer slurry has poor thermal insulation performance. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the thermal insulation performance of the putty layer slurry in the prior art needs to be further improved, thereby providing an aerogel thermal insulation composite slurry and a preparation method and application thereof.

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

[0005] The present invention provides an aerogel thermal insulation composite slurry, comprising a silicon dioxide aerogel paste, a polymer emulsion, white cement and a filler;

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

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

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

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

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

[0011] The silica aerogel A has a porosity of ≥98% and a tap density of 0.05-0.1 g / cm 3, thermal conductivity is 0.010~0.025W / (m·K); density is 0.45~0.55g / cm 3 .

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

[0013] In an optional 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 optional embodiment, the mass ratio of the white cement to the filler is (30-40):(60-90);

[0015] In an optional embodiment, the polymer emulsion includes at least one of acrylic emulsion, vinyl acetate emulsion and silicone acrylic emulsion. It should be noted that the polymer emulsion can be obtained commercially and is not specifically limited.

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

[0017] The organosilicon-modified silicone-acrylic emulsion is a functional emulsion obtained by core-shell encapsulation polymerization of an organosilicon monomer containing an unsaturated bond (such as methyltrimethoxysilane, vinyltriethoxysilane, etc.) and an acrylic monomer. It has good water resistance and weather resistance and can be purchased commercially.

[0018] In an optional embodiment, the aerogel thermal insulation composite slurry includes 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 includes at least one of a defoaming agent and a mildew preventer;

[0022] Preferably, the defoamer includes at least one of a mineral oil defoamer, a silicone defoamer, a polyether defoamer, a polyether-modified polysiloxane defoamer and a bio-enzyme defoamer;

[0023] Preferably, the defoamer is a mixture of a mineral oil type defoamer and a silicone type defoamer;

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

[0025] Preferably, the mildewcide comprises an organic mildewcide;

[0026] Preferably, the organic mildew preventer includes at least one of octylisothiazolinone, dichloro-N-octyl-4-isothiazolinone, benzisothiazolinone and butylbenzisothiazolinone.

[0027] In an optional embodiment, the aerogel thermal insulation composite slurry further includes a second auxiliary agent; the second auxiliary agent includes a thickener;

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

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

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

[0031] Preferably, the cellulose thickener is hydroxypropyl methylcellulose;

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

[0033] In an optional 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 lime powder;

[0035] Preferably, the filler comprises quartz powder, heavy calcium and lime 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 lime powder is 100-600 mesh.

[0039] The present invention provides a preferred aerogel thermal insulation composite slurry, comprising a silica aerogel paste A, a silica aerogel paste B, a polymer emulsion, a solvent, and a first auxiliary agent in a mass ratio of (10-30):(10-30):(30-40):(30-40):(1-3); and also comprising white cement, quartz powder, heavy calcium, lime powder, and a thickener in a mass ratio of (30-40):(20-30):(20-30):(20-30):(1-10).

[0040] The present invention also provides a method for preparing an aerogel thermal insulation composite slurry, comprising the following steps:

[0041] (1) preparing component A: stirring the polymer emulsion for the first time, and then adding silica aerogel paste A and silica aerogel paste B for the second time, wherein the silica aerogel paste A includes silica aerogel A, and the silica aerogel paste B includes silica aerogel B, and the particle size of silica aerogel A is smaller than that of silica aerogel B;

[0042] (2) Preparation of component B: Mix white cement and filler evenly;

[0043] (3) Add component B to component A and disperse.

[0044] In an optional embodiment, the method for preparing the silica aerogel paste A comprises: first mixing the silica aerogel A and water;

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

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

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

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

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

[0050] In an optional embodiment, the method for preparing the silica aerogel paste B comprises: secondly mixing the silica aerogel B having a D90 of 60-80 μm and water;

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

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

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

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

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

[0056] The dispersant includes at least one of tego750W, HLD-8K / S, SYZ-84190, and BYK-190;

[0057] Preferably, the dispersant is tego750W;

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

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

[0060] In an optional embodiment, the dispersion speed is 1000-2000 rpm;

[0061] In an optional embodiment, the dispersion time is 30-60 min;

[0062] In an optional embodiment, the first stirring further includes adding a solvent;

[0063] Preferably, the solvent comprises water;

[0064] In an optional embodiment, the second stirring further includes adding a first auxiliary agent;

[0065] In an optional embodiment, the preparation of component B further includes adding a second auxiliary agent.

[0066] The present invention also provides application of the aerogel thermal insulation composite slurry or the aerogel thermal insulation composite slurry prepared by the preparation method in building exterior walls.

[0067] The present invention can further combine the aerogel thermal insulation composite slurry with the exterior wall thermal insulation system to improve the thermal insulation performance.

[0068] The technical solution of the present invention has the following advantages:

[0069] 1. The aerogel thermal insulation composite slurry provided by the present invention comprises a silica aerogel paste, a polymer emulsion, white cement and a filler; the silica aerogel paste comprises a silica aerogel paste A and a silica aerogel paste B, the silica aerogel paste A comprises a silica aerogel A, the silica aerogel paste B comprises a 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 present invention has the conventional putty effects such as wall leveling, waterproofing, reinforcement, crack resistance, mildew resistance, etc., and also has good thermal insulation performance; compared with traditional putty slurry, it has a lower density, has little effect on the strength of the building when applied on it, and has a higher safety factor; it also has better thermal insulation effect, and the thermal conductivity is as low as 0.08 to 0.12 W / (m·K). The particle size of silica aerogel A is smaller than that of silica aerogel B, so that silica aerogel A is filled in the gaps of silica aerogel B, and the stacking is dense to increase the heat conduction path, so that the thermal conductivity is further reduced, and the thermal insulation effect of the slurry can be improved. The silica aerogel added to the aerogel thermal insulation composite slurry provided by the present invention is in a paste state, so that the amount of silica aerogel added is higher, the thermal conductivity of the composite slurry is lower, and a better thermal insulation effect is achieved.

[0070] In the prior art, thermal insulation coating is applied outside the putty layer, and then the exterior wall insulation system is made. The steps are cumbersome and the construction is difficult. The bonding strength between the layers deteriorates, resulting in poor thermal insulation performance. After the putty layer is prepared by the aerogel thermal insulation composite slurry provided by the present invention, the exterior wall insulation system can be directly made without applying thermal insulation coating. The steps are simple, and the floor space and space occupied can be reduced. The bonding strength between the putty layer and the exterior wall insulation system is better, thereby improving the thermal insulation performance.

[0071] 2. The method for preparing aerogel thermal insulation composite slurry provided by the present invention can quickly prepare aerogel thermal insulation composite slurry by preparing component A and component B respectively, mixing the dry material of component B evenly and then adding the wet material of component A, thereby greatly reducing the preparation time. At the same time, the prepared aerogel thermal insulation composite slurry has uniform distribution of components and better thermal insulation performance. The present invention first prepares silica aerogel powder into a paste, which can improve the compatibility of aerogel particles with the matrix resin. DETAILED DESCRIPTION

[0072] The following examples are provided for a better understanding of the present invention, but are not intended to limit the best mode of implementation, nor to limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts shall fall within the protection scope of the present invention.

[0073] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[0074] Example 1

[0075] This embodiment provides a method for preparing an 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 the mixture was stirred at 2000 rpm for 10 min to obtain 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 the mixture was stirred at 2000 rpm for 10 min to obtain silica aerogel paste B.

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

[0078] (3) By weight, 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 lime powder and 5 parts of hydroxypropyl methylcellulose were mixed uniformly to obtain component B.

[0079] (4) Place component A in a high-speed disperser, stir at 500 rpm, add component B and gradually increase the speed to 1200 rpm, and stir for 30 minutes; obtain an aerogel thermal insulation composite slurry.

[0080] Example 2

[0081] This embodiment provides a method for preparing an 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 mixed at 1000 rpm for 5 min to prepare 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 mixed at 1000 rpm for 5 min to prepare silica aerogel paste B.

[0083] (2) By weight, 30 parts of vinyl acetate emulsion and 30 parts of water were placed in a high-speed disperser, stirred at 200 rpm, and 20 parts of silica aerogel paste A and 20 parts of silica aerogel paste B were added successively with a spatula; then 1 part of silicone defoamer and 1 part of octyl isothiazolinone were added, the speed was increased to 600 rpm and stirred evenly to obtain component A.

[0084] (3) 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 lime powder and 5 parts of hydroxymethyl cellulose were mixed uniformly to obtain component B.

[0085] (4) Place component A in a high-speed disperser, stir at 500 rpm, add component B and gradually increase the speed to 1200 rpm, and stir for 30 minutes; obtain an aerogel thermal insulation composite slurry.

[0086] Example 3

[0087] This embodiment provides a method for preparing an aerogel thermal insulation composite slurry, comprising the following steps:

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

[0089] (2) By weight, 30 parts of silicone-modified silicone acrylic emulsion and 30 parts of water are placed in a high-speed disperser, stirred at 200 rpm, and 30 parts of silica aerogel paste A and 10 parts of silica aerogel paste B are added successively with a spatula; then 1 part of a mixture of a mineral oil type defoamer and a silicone type defoamer and 1 part of octyl isothiazolinone are added, the speed is increased to 600 rpm and stirred evenly to obtain component A; the mass ratio of the mineral oil type defoamer to the silicone type defoamer is 1:1;

[0090] (3) 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 lime powder and 1 part of hydroxypropyl methylcellulose were mixed uniformly to obtain component B.

[0091] (4) Place component A in a high-speed disperser, stir at 500 rpm, add component B and gradually increase the speed to 1200 rpm, and stir for 30 minutes; obtain an aerogel thermal insulation composite slurry.

[0092] Comparative Example 1

[0093] This comparative example provides a method for preparing a thermal insulation slurry. Compared with Example 1, the only difference is that this comparative example does not add silica aerogel paste A; the added silica aerogel paste B is 40 parts.

[0094] Comparative Example 2

[0095] This comparative example provides a method for preparing a thermal insulation slurry. Compared with Example 1, the only difference is that the silica aerogel paste B is not added in this comparative example; 40 parts of silica aerogel paste A are added.

[0096] Comparative Example 3

[0097] This comparative example provides a method for preparing a thermal insulation slurry. Compared with Example 1, the only difference is that this comparative example does not add silica aerogel paste A and silica aerogel paste B; 40 parts of acrylic emulsion are added; and 40 parts of water are added.

[0098] Test Case

[0099] The thermal insulation slurries prepared in Examples 1-4 and Comparative Examples 1-4 were tested for performance, as follows:

[0100] (1) Thermal conductivity test method: refer to the method of GB / T10295-2008;

[0101] (2) Density detection method: refer to the method of JG / T157-2009;

[0102] Table 1

[0103]

[0104] It can be seen from Table 1 that the aerogel thermal insulation composite slurry provided by the present invention has a low thermal conductivity and a better thermal insulation effect; its density is lower, which means that it has less impact on building strength and a higher safety factor.

[0105] Specifically, in Comparative Example 1-2, only silica aerogel paste of a single particle size is added, and its thermal conductivity is higher, but the thermal insulation effect is worse; in Comparative Example 3, no silica aerogel paste is added, and its density and thermal conductivity are greatly increased.

[0106] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. An aerogel thermal insulation composite slurry, characterized in that: It includes silica aerogel paste, polymer emulsion, white cement and filler; The silica aerogel paste includes silica aerogel paste A and silica aerogel paste B. The silica aerogel paste A includes silica aerogel A, and the silica aerogel paste B includes silica aerogel B. The particle size of silica aerogel A is smaller than that of silica aerogel B.

2. The aerogel thermal insulation composite slurry according to claim 1, characterized in that: The solid content of the silica aerogel paste A is 20-30%; and / or, The D90 of the silica aerogel A is 20-40 μm; and / or, The solid content of the silica aerogel paste B is 20-30%; and / or, The D90 of the silica aerogel B is 60-80 μm.

3. The aerogel thermal insulation composite slurry according to claim 1, characterized in that: 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); and / or, The mass ratio of the white cement to the filler is (30-40):(60-90); and / or, The polymer emulsion includes at least one of acrylic emulsion, vinyl acetate emulsion and silicone acrylic emulsion.

4. The aerogel thermal insulation composite slurry according to claim 1, characterized in that: The aerogel thermal insulation composite slurry includes a solvent and / or a first auxiliary agent; Preferably, the mass ratio of the polymer emulsion, the solvent and the first auxiliary agent is (30-40):(30-40):(1-3); Preferably, the first auxiliary agent includes at least one of a defoaming agent and a mildew preventer; Preferably, the defoamer includes at least one of a mineral oil defoamer, a silicone defoamer, a polyether defoamer, a polyether-modified polysiloxane defoamer and a bio-enzyme defoamer; Preferably, the defoamer is a mixture of a mineral oil type defoamer and a silicone type defoamer; Preferably, the mass ratio of the mineral oil type defoamer to the silicone type defoamer is (1-3):1; Preferably, the mildewcide comprises an organic mildewcide; Preferably, the organic mildew preventer includes at least one of octylisothiazolinone, dichloro-N-octyl-4-isothiazolinone, benzisothiazolinone and butylbenzisothiazolinone.

5. The aerogel thermal insulation composite slurry according to claim 1, characterized in that: The aerogel thermal insulation composite slurry further includes a second auxiliary agent; the second auxiliary agent includes a thickener; Preferably, the thickener comprises a water-soluble polymer synthetic thickener; Preferably, the water-soluble polymer synthetic thickener comprises at least one of a cellulose thickener and an associative thickener; Preferably, the cellulose thickener comprises at least one of hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose and hydroxypropyl methyl cellulose; Preferably, the cellulose thickener is hydroxypropyl methylcellulose; Preferably, the mass ratio of the white cement to the thickener is (30-40):(1-10).

6. The aerogel thermal insulation composite slurry according to claim 1, characterized in that: The particle size of the white cement is 100-600 mesh; Preferably, the filler comprises at least one of quartz powder, heavy calcium and lime powder; Preferably, the filler comprises quartz powder, heavy calcium and lime powder in a mass ratio of (2-3): (2-3): (2-3); Preferably, the particle size of the quartz powder is 100-600 mesh; Preferably, the particle size of the heavy calcium is 100-600 mesh; Preferably, the particle size of the lime powder is 100-600 mesh.

7. A method for preparing aerogel thermal insulation composite slurry, characterized in that: The steps include: (1) preparing component A: stirring the polymer emulsion for the first time, and then adding silica aerogel paste A and silica aerogel paste B for the second time, wherein the silica aerogel paste A includes silica aerogel A, and the silica aerogel paste B includes silica aerogel B, and the particle size of silica aerogel A is smaller than that of silica aerogel B; (2) Preparation of component B: Mix white cement and filler evenly; (3) Add component B to component A and disperse.

8. The aerogel thermal insulation composite slurry according to claim 7, characterized in that: The method for preparing the silica aerogel paste A comprises: first mixing the silica aerogel A and water; Preferably, the mass ratio of the silica aerogel A to water is (1-3):(4-7); Preferably, the first mixing speed is 1000-4000 rpm; Preferably, the first mixing time is 5-20 min; Preferably, the first mixing further comprises adding a dispersant; And / or, the preparation method of the silica aerogel paste B comprises: secondly mixing the silica aerogel B having a D90 of 60-80 μm and water; Preferably, the mass ratio of the silica aerogel B to water is (1-3):(4-7); Preferably, the second mixing speed is 1000-4000rpm; Preferably, the second mixing time is 5-20min; Preferably, the second mixing further comprises adding a dispersant.

9. The preparation method according to claim 7, characterized in that: The first stirring speed is 200-400 rpm; and / or, The second stirring speed is 600-1000 rpm; and / or, The dispersion speed is 1000-2000 rpm; and / or, The dispersion time is 30-60 min; and / or, The first stirring further comprises adding a solvent; and / or, The second stirring further includes adding a first auxiliary agent; and / or, The preparation of component B also includes adding a second auxiliary agent.

10. Use of the aerogel thermal insulation composite slurry according to any one of claims 1 to 6 or the aerogel thermal insulation composite slurry prepared by the preparation method according to any one of claims 7 to 9 in building exterior walls.

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