Inorganic aerogel layer composition, inorganic aerogel layer and method for preparing the same, inorganic aerogel waterproofing membrane

Abstract

The application relates to the technical field of building waterproofing, and discloses an inorganic aerogel layer composition, an inorganic aerogel layer and a preparation method thereof, and an inorganic aerogel waterproofing roll. The composition is composed of a main agent and an auxiliary agent; the main agent contains 35-45 parts by weight of inorganic aerogel coating, 20-30 parts by weight of modified acrylate emulsion, 1.0-2.0 parts by weight of a crosslinking agent, 5-15 parts by weight of hollow glass microbeads and 20-30 parts by weight of water, with the total weight of the composition being 100 parts by weight; the auxiliary agent contains 0.5-1.0 parts by weight of a dispersing agent, 0.1-0.4 parts by weight of an antifoaming agent, 0.3-0.5 parts by weight of a rheological agent and 0-6 parts by weight of a flame retardant. The inorganic aerogel waterproofing roll has excellent waterproofing performance, heat insulation performance, light weight and high construction efficiency.

Description

Technical Field

[0001] This invention relates to the field of building waterproofing technology, specifically to compositions for inorganic aerogel layers, inorganic aerogel layers and their preparation methods, and inorganic aerogel waterproof membranes. Background Technology

[0002] In today's era of advocating green and sustainable development, the production process of asphalt-based waterproof membranes may generate harmful gases and waste. Improper handling of this waste can pollute the environment, presenting both challenges and opportunities for the asphalt waterproof membrane market. Therefore, in such a competitive market, companies need to continuously improve their technology and product quality to gain a competitive edge.

[0003] Existing roll materials generally use organic foam layers (XPS, PU) or pure SiO2 aerogel felt with a thickness of ≥3 mm, which is difficult to meet the requirements of lightweight building and space-constrained scenarios.

[0004] Pure SiO2 aerogel coatings are brittle and prone to powdering, requiring a large amount of organic fiber / resin for toughening, which leads to increased costs and reduced flame retardancy.

[0005] Although commercially available inorganic aerogel coatings (such as Zhongning Technology's AG-C series) can be applied directly, they have low solid content (≤15 wt%) when used alone, requiring multiple applications which complicates the process; they also have large drying shrinkage and are prone to cracking; and their high unit price makes the overall cost of roll materials unacceptable.

[0006] Therefore, the industry needs a material that is "ultra-thin (≤1 mm) + inorganic flame retardant Class A + thermal conductivity λ≤0.024 W·m". -1 ·K -1 +Roll material cost ≤ 50 RMB / m 2 A comprehensive solution. Summary of the Invention

[0007] The purpose of this invention is to overcome the problems of excessive thickness, increased cost, and reduced flame retardant rating of inorganic aerogel coatings in existing waterproof membranes.

[0008] To achieve the above objectives, a first aspect of the present invention provides a composition for an inorganic aerogel layer, the composition comprising a main agent and auxiliary agents; based on a total weight of 100 parts by weight of the composition.

[0009] The main agent contains 35-45 parts by weight of inorganic aerogel coating, 20-30 parts by weight of modified acrylic emulsion, 1.0-2.0 parts by weight of crosslinking agent, 5-15 parts by weight of hollow glass microspheres, and 20-30 parts by weight of water.

[0010] The inorganic aerogel coating has a solid content of 15-30 wt% and an average particle size ≤50 μm; the modified acrylate emulsion is an acrylate-silane modified emulsion; the crosslinking agent is an epoxy-siloxane crosslinking agent with a total functionality ≥2; and the true density of the hollow glass microspheres is 0.15-0.20 g·cm³. -3 The average particle diameter is 20-80 μm.

[0011] A second aspect of the present invention provides a method for preparing an inorganic aerogel layer, the method being carried out using the components of the composition described in the first aspect, characterized in that the method comprises:

[0012] (1) Material I, containing the first main agent and the first auxiliary agent, is mixed and reacted with the second main agent and the second auxiliary agent to obtain material II;

[0013] The first main agent and the second main agent together form the main agent in the composition, and the first auxiliary agent and the second auxiliary agent together form the auxiliary agent in the composition;

[0014] The first main agent contains inorganic aerogel coating, water and hollow glass microspheres, and the first auxiliary agent contains a dispersant;

[0015] The second main agent contains a modified acrylate emulsion and a crosslinking agent, and the second auxiliary agent contains an antifoaming agent and a rheology modifier. Optionally, the second auxiliary agent also contains a flame retardant.

[0016] (2) Apply material II to at least one side of the substrate and dry it to obtain the inorganic aerogel layer.

[0017] A third aspect of the present invention provides an inorganic aerogel layer prepared by the method described in the second aspect.

[0018] A fourth aspect of the present invention provides an inorganic aerogel waterproof membrane comprising the inorganic aerogel layer described in the third aspect.

[0019] This invention uses inorganic aerogel as a thermal insulation material, combined with pressure-sensitive adhesive, hot melt adhesive or butyl rubber as an adhesive layer, to provide a roll material structure and a matching inorganic aerogel coating formulation.

[0020] The inorganic aerogel single-layer coating dry film provided by this invention has a thickness of 190-310μm, which can achieve the designed thermal conductivity λ; the overall thickness of the inorganic aerogel waterproof membrane is ≤1 mm, which reduces the weight by >65% compared with the traditional 3 mm XPS membrane (extruded polystyrene foam membrane); and achieves λ≤0.024W·m. -1 ·K -1 The cost can be as low as 27.9 yuan / m² 2It has significant advantages; it has application prospects such as large-scale building roofs and photovoltaic module backsheets; and it has passed GB / T 8624-2012 Class A non-combustible certification.

[0021] The inorganic aerogel waterproof membrane provided by this invention has high thermal insulation performance. The inorganic aerogel has an ultra-low thermal conductivity, which can significantly reduce heat transfer. At the same time, if the substrate adopts the reflective thermal insulation effect of the non-woven aluminum foil composite film, the thermal insulation performance of the membrane can be further improved, which helps to save energy and reduce consumption in buildings.

[0022] The inorganic aerogel waterproof membrane provided by this invention has the advantages of being lightweight and having high construction efficiency. Compared with traditional asphalt membranes, the ultra-thin inorganic aerogel heat insulation and cold protection adhesive construction provided by this invention can be laid quickly and conveniently, greatly improving construction efficiency. Detailed Implementation

[0023] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0024] As previously described, a first aspect of the present invention provides a composition for an inorganic aerogel layer, the composition comprising a main agent and auxiliary agents; based on a total weight of 100 parts by weight of the composition.

[0025] The main agent contains 35-45 parts by weight of inorganic aerogel coating, 20-30 parts by weight of modified acrylic emulsion, 1.0-2.0 parts by weight of crosslinking agent, 5-15 parts by weight of hollow glass microspheres, and 20-30 parts by weight of water.

[0026] The inorganic aerogel coating has a solid content of 15-30 wt% and an average particle size ≤50 μm; the modified acrylate emulsion is an acrylate-silane modified emulsion; the crosslinking agent is an epoxy-siloxane crosslinking agent with a total functionality ≥2; and the true density of the hollow glass microspheres is 0.15-0.20 g·cm³. -3 The average particle diameter is 20-80 μm.

[0027] Preferably, the inorganic aerogel coating is selected from at least one of AG-C20, AG-C25, and AG-C30.

[0028] Preferably, the AG-C20 is a SiO2 aerogel dispersion with a solid content of 20 wt% and an average particle size of 15 μm. Under this preferred condition, the inorganic aerogel waterproof membrane provided by the present invention has excellent thermal insulation performance.

[0029] Preferably, the crosslinking agent is selected from at least one of KS-330 and KH-560.

[0030] Preferably, KS-330 is an epoxy-siloxane bifunctional compound with an activity ≥95%. In this preferred embodiment, the inorganic aerogel waterproof membrane provided by the present invention has higher peel strength.

[0031] Preferably, the glass transition temperature of the acrylate-silane modified emulsion is -25°C to -15°C.

[0032] More preferably, the acrylate-silane modified emulsion has a glass transition temperature of -25°C and a solid content of 45 wt%. Under this preferred condition, the inorganic aerogel waterproof membrane provided by the present invention has high flexibility.

[0033] More preferably, the acrylate-silane modified emulsion is a product prepared by a method comprising the following steps:

[0034] S1: In the presence of a solvent, the components in the modified material are first mixed to obtain material I; based on the total weight of the modified material, the modified material contains 10-20wt% hard monomer, 20-30wt% soft monomer, 1-3wt% double-bonded silane coupling agent, and 1-2wt% functional monomer.

[0035] S2: Material I is emulsion polymerized with potassium persulfate to obtain intermediate I; the amount of potassium persulfate used is 0.3-0.5 wt% based on the total weight of the modified material.

[0036] S3: Adjust the pH value of intermediate I to 7-8 to obtain the acrylate-silane modified emulsion.

[0037] Preferably, in step S1, the hard monomer is selected from at least one of methyl methacrylate, styrene, isobornyl methacrylate, cyclohexyl methacrylate, and tert-butyl methacrylate.

[0038] Preferably, in step S1, the soft monomer is selected from at least one of butyl acrylate, isooctyl acrylate, n-octyl acrylate, lauryl acrylate, and ethylhexyl acrylate.

[0039] Preferably, in step S1, the double-bonded silane coupling agent is selected from at least one of γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxyvinyltriethoxysilylsilane, vinyltrimethoxysilane, and vinyltris(2-methoxyethoxy)silane.

[0040] Preferably, in step S1, the functional monomer is selected from at least one of acrylic acid, hydroxyethyl methacrylate, methacrylic acid, N-hydroxymethylacrylamide, and glycidyl methacrylate.

[0041] Preferably, in step S1, the solvent is 50-60 wt% deionized water, based on the total weight of the modified material.

[0042] Preferably, in step S2, the conditions for emulsion polymerization include: a temperature of 75-80°C and a time of 3-4 hours.

[0043] Preferably, based on 100 parts by weight of the total composition, the additives contain 0.5-1.0 parts by weight of dispersant; 0.1-0.4 parts by weight of defoamer; 0.3-0.5 parts by weight of rheology modifier; and 0-6 parts by weight of flame retardant.

[0044] Preferably, the dispersant is a high molecular weight block copolymer aqueous dispersant.

[0045] More preferably, the dispersant is BYK-190.

[0046] Preferably, the defoamer is selected from at least one of silicone oil defoamers, polyether defoamers, and aldehyde-ketone defoamers.

[0047] More preferably, the defoamer is Tego-810.

[0048] Preferably, the rheology modifier is selected from at least one of nonionic hydrophobic modified polyurethane rheology modifier, polyacrylate rheology modifier, fumed silica, and polyamide wax.

[0049] More preferably, the rheology modifier is a hydrophobic associative type SCT-275.

[0050] More preferably, the flame retardant is aluminum hydroxide and / or magnesium hydroxide.

[0051] More preferably, the flame retardant has an average particle diameter of 1-3 μm.

[0052] As previously stated, a second aspect of the present invention provides a method for preparing an inorganic aerogel layer, the method being carried out using the components of the composition described in the first aspect, characterized in that the method comprises:

[0053] (1) Material I, containing the first main agent and the first auxiliary agent, is mixed and reacted with the second main agent and the second auxiliary agent to obtain material II;

[0054] The first main agent and the second main agent together form the main agent in the composition, and the first auxiliary agent and the second auxiliary agent together form the auxiliary agent in the composition;

[0055] The first main agent contains inorganic aerogel coating, water and hollow glass microspheres, and the first auxiliary agent contains a dispersant;

[0056] The second main agent contains a modified acrylate emulsion and a crosslinking agent, and the second auxiliary agent contains an antifoaming agent and a rheology modifier. Optionally, the second auxiliary agent also contains a flame retardant.

[0057] (2) Apply material II to at least one side of the substrate and dry it to obtain the inorganic aerogel layer.

[0058] Preferably, in step (1), the conditions for the mixing reaction include: a rotation speed of 400-4000 rpm and a time of 5-30 min.

[0059] More preferably, in step (1), the mixing reaction includes steps such as premixing, dispersion, and crosslinking.

[0060] More preferably, in step (1), the premixing conditions include: a rotation speed of 800-1500 rpm and a time of 10-20 min.

[0061] More preferably, in step (1), the dispersion conditions include: a rotation speed of 2500-3500 rpm and a time of 5-15 min.

[0062] More preferably, in step (1), the crosslinking conditions include: a rotation speed of 400-600 rpm and a time of 5-10 min.

[0063] More preferably, in step (1), the crosslinking is carried out under vacuum conditions.

[0064] Preferably, in step (2), the coating method is slot coating.

[0065] Preferably, in step (2), the drying process is oven drying.

[0066] Preferably, in step (2), the drying process is a gradient drying process.

[0067] More preferably, the gradient drying process includes drying at a first temperature and then drying at a second temperature; the first temperature is 30-50°C lower than the second temperature.

[0068] More preferably, the drying time at the first temperature is 1-5 minutes.

[0069] More preferably, the drying time at the second temperature is 1-5 minutes.

[0070] Preferably, in step (2), the substrate is a nonwoven aluminum foil composite film (PET / AL / nonwoven fabric).

[0071] As previously described, a third aspect of the present invention provides an inorganic aerogel layer prepared by the method described in the second aspect.

[0072] As previously described, a fourth aspect of the present invention provides an inorganic aerogel waterproof membrane containing the inorganic aerogel layer described in the third aspect.

[0073] Preferably, the waterproof membrane further comprises an isolation layer and an adhesive layer.

[0074] More preferably, the waterproof membrane contains an isolation layer, an adhesive layer, and an inorganic aerogel layer stacked sequentially.

[0075] More preferably, the thickness ratio of the isolation layer, the adhesive layer, and the inorganic aerogel layer is 1:6-10:7-13.

[0076] According to a preferred embodiment, the thickness of the isolation membrane is 25 μm, the thickness of the adhesive layer is 150-250 μm, and the thickness of the inorganic aerogel layer is 190-310 μm.

[0077] Preferably, the separator is a PET separator.

[0078] Preferably, the adhesive layer is selected from at least one of pressure-sensitive adhesive layer, hot melt adhesive layer, and butyl adhesive layer.

[0079] According to a particularly preferred embodiment, the waterproof membrane is obtained by online lamination of the isolation layer, the adhesive layer, and the inorganic aerogel layer. In this preferred embodiment, the inorganic aerogel waterproof membrane provided by the present invention has excellent waterproof performance, high adhesion of hot melt adhesive or butyl rubber, and combined with the waterproof properties of the inorganic aerogel layer and the substrate, forming a multi-layer waterproof structure that can effectively resist the penetration of rainwater and groundwater, ensuring the waterproof effect of the building.

[0080] The present invention will be described in detail below through embodiments. In the following embodiments, unless otherwise specified, all raw materials are commercially available products. In the following examples, unless otherwise specified, "part" refers to "parts by weight," where each part by weight is 1g.

[0081] Inorganic aerogel coating: Zhongning Technology aerogel coating AG-C20 (SiO2 aerogel dispersion, solid content of 20wt%, average particle size of 15μm), purchased from Shenzhen Zhongning Technology Co., Ltd.

[0082] Acrylic ester-silane modified emulsion I: self-made, glass transition temperature -25℃, solid content 45 wt%, preparation method as follows:

[0083] S1: Mix 120g of deionized water, 35g of methyl methacrylate, 45g of butyl acrylate, 4g of γ-methacryloyloxypropyltrimethoxysilane, and 2.5g of acrylic acid to obtain material I.

[0084] S2: Material I is emulsion polymerized with 0.8g of potassium persulfate at a temperature of 75℃ for 3h to obtain intermediate I;

[0085] S3: Adjust the pH of intermediate I to 7 to obtain acrylate-silane modified emulsion I.

[0086] Acrylic ester-silane modified emulsion II: self-made, glass transition temperature is -30℃, solid content is 45 wt%, preparation method is as follows: the same preparation process as acrylic ester-silane modified emulsion I is adopted, the difference is that the amount of methyl methacrylate is adjusted to 28g and the amount of butyl acrylate is adjusted to 52g.

[0087] Acrylic ester emulsion: purchased from Shandong Borui Chemical Co., Ltd., model BR-501Si, glass transition temperature -20℃, solid content 45wt%.

[0088] Crosslinking agent: KS-330 (containing epoxy-siloxane bifunctional groups, activity ≥95%), purchased from Yunsheng Chemical (Shandong) Co., Ltd.

[0089] Hollow glass microspheres I: True density is 0.18 g·cm³ -3 The average particle diameter was 50 μm, and it was purchased from Zhongke Huaxing New Materials Co., Ltd.

[0090] Hollow glass microspheres II: True density is 0.3 g·cm³ -3 The average particle diameter was 120 μm, and it was purchased from Zhongke Huaxing New Materials Co., Ltd.

[0091] Dispersant: BYK-190, purchased from BYK Chemical (Shanghai) Co., Ltd.

[0092] Defoamer: Tego-810, purchased from Evonik Specialty Chemicals (Shanghai) Co., Ltd.

[0093] Rheology modifier: hydrophobic associative SCT-275, purchased from Evonik Specialty Chemicals (Shanghai) Co., Ltd.

[0094] Flame retardant: aluminum hydroxide, with an average particle diameter of 1-3 μm, purchased from Shandong Aluminum Magnesium New Materials Co., Ltd.

[0095] Example 1: Preparation of Inorganic Aerogel Waterproof Membrane

[0096] (1) The first main agent (inorganic aerogel coating, water and hollow glass microspheres) and the first auxiliary agent (dispersant) were stirred at 1000 rpm for 15 min to premix and obtain material I; then the acrylate-silane modified emulsion and the second auxiliary agent (defoamer and rheology modifier) ​​in the second main agent were added and stirred at 3000 rpm for 10 min to disperse; finally the crosslinking agent in the second main agent was added and the mixture was degassed under vacuum at 500 rpm for 5 min to crosslink and obtain material II;

[0097] (2) Using a slot extrusion coating machine, material II is coated on one side of the nonwoven aluminum foil composite film (pre-corona treatment), with a wet film thickness of 300-400μm, and then subjected to gradient drying. The gradient drying conditions include: first drying at 80℃ (i.e., the first temperature) for 2 minutes, and then drying at 110℃ (i.e., the second temperature) for 1 minute until the crosslinking is complete, thus obtaining an inorganic aerogel layer.

[0098] (3) A hot melt adhesive layer (i.e., adhesive layer) and a PET release film (i.e. release layer) are sequentially bonded on the inorganic aerogel layer online, rolled up, and composited to obtain an inorganic aerogel waterproof membrane, wherein the thickness of the release film is 25μm, the thickness of the hot melt adhesive layer is 200μm, and the thickness of the inorganic aerogel layer is 300μm.

[0099] The remaining types and amounts of raw materials in this embodiment are shown in Table 1.

[0100] Examples 2-5

[0101] The same process as in Example 1 was used, except that the types and amounts of raw materials used in the other examples were different, as detailed in Table 1.

[0102] Table 1

[0103]

[0104] Comparative Example 1

[0105] The procedure was the same as in Example 1, except that hollow glass microspheres were not added, and the amount of water was adjusted from 22 parts to 30 parts, the amount of dispersant from 0.5 parts to 0.75 parts, the amount of defoamer from 0.2 parts to 0.35 parts, and the amount of rheology modifier from 0.3 parts to 0.4 parts. Specifically,

[0106] (1) The first main agent (inorganic aerogel coating, water) and the first auxiliary agent (dispersant) are stirred at 1000 rpm for 15 min to premix and obtain material I; then the acrylate-silane modified emulsion and the second auxiliary agent (defoamer and rheology modifier) ​​in the second main agent are added and stirred at 3000 rpm for 10 min to disperse; finally, the crosslinking agent in the second main agent is added and the mixture is degassed under vacuum at 500 rpm for 5 min to crosslink and obtain material II;

[0107] The remaining steps are the same as in Example 1, and the inorganic aerogel waterproof membrane is obtained.

[0108] Comparative Example 2: Pure AG-C20 formulation, without acrylate emulsion / crosslinking agent

[0109] Take 100 parts of AG-C20 and 0.5 parts of thickener (hydroxyethyl cellulose), add an appropriate amount of water to adjust the viscosity and mix. Apply the mixture three times to a non-woven aluminum foil composite film to obtain an inorganic aerogel layer. Then, attach a hot melt adhesive layer and a PET release film to the inorganic aerogel layer online to obtain an inorganic aerogel waterproof membrane. The thickness of the release film is 25 μm, the thickness of the hot melt adhesive layer is 200 μm, and the thickness of the inorganic aerogel layer is 300 μm.

[0110] Comparative Example 3

[0111] The same process as in Example 1 was used, except that "hollow glass microspheres I" was replaced with an equal amount of "hollow glass microspheres II". All other steps were the same as in Example 1 to obtain inorganic aerogel waterproof membrane.

[0112] Comparative Example 4

[0113] The same process as in Example 1 was used, except that “acrylate-silane modified emulsion I” was replaced with an equal amount of “acrylate emulsion”. All other steps were the same as in Example 1 to obtain inorganic aerogel waterproof membrane.

[0114] Test case

[0115] The physical performance test data of the examples and comparative examples are shown in Table 2.

[0116] The test method for dry film thickness is GB / T 13477.2-2002, micrometer method.

[0117] The test method for thermal conductivity λ is GB / T 10295-2008 heat flow meter method, with a temperature of 25 ℃.

[0118] The evaluation standard for flame retardancy rating is GB / T 8624-2012.

[0119] The test method for peel strength is GB / T 328.20-2007.

[0120] Table 2

[0121]

[0122] The thermal conductivity of waterproof membrane is an important indicator of its insulation performance. The lower the thermal conductivity, the weaker the material's heat transfer ability, and the better the insulation effect. Therefore, choosing a membrane with low thermal conductivity can effectively prevent heat transfer.

[0123] The organic foaming material used in this invention has excellent thermal insulation properties. Examples 1-5, while maintaining a total thickness of less than 1 mm, Class A fire resistance, and complete waterproofing, achieved λ≤0.024 W·m using an "AG-C20 + glass microspheres + KS-330 crosslinking" system. -1 ·K -1 Cost ≤ 31 yuan / m 2 The significant advantages of glass microspheres; Comparative Examples 1 and 2 respectively demonstrate the synergistic thermal insulation of glass microspheres and the indispensability of acrylate emulsion / crosslinking agent for mechanical properties.

[0124] In addition, this invention uses AG-C20 as a "functional filler" instead of a single host. By introducing a flexible emulsion and crosslinking agent KS-330, silane-epoxy double crosslinking is completed at room temperature to form a "SiO2 aerogel network-elastomer interpenetration" structure, which takes into account both low thermal conductivity and high flexibility.

[0125] The synergistic effect of glass microspheres and AG-C20 utilizes the dual-scale thermal insulation of hollow microspheres and aerogel nanopores to achieve a thermal conductivity ≤0.022 W·m at a solid content of 50 wt%. -1 ·K -1 ;

[0126] The acrylic emulsion / crosslinking agent system reduces the amount of AG-C20 used to 35 wt%-45 wt%, resulting in a cost reduction of ≥40% compared to traditional all-aerogel coatings;

[0127] KS-330 reacts with the hydroxyl groups on the surface of glass microspheres, which can improve interfacial adhesion, and the 180° peel strength of the roll material is ≥1.2N / mm.

[0128] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A composition for use in inorganic aerogel layers, characterized in that, The composition consists of a main agent and auxiliary agents; based on a total weight of 100 parts by weight of the composition. The main agent contains 35-45 parts by weight of inorganic aerogel coating, 20-30 parts by weight of modified acrylic emulsion, 1.0-2.0 parts by weight of crosslinking agent, 5-15 parts by weight of hollow glass microspheres, and 20-30 parts by weight of water. The inorganic aerogel coating has a solid content of 15-30 wt% and an average particle size ≤50 μm; the modified acrylate emulsion is an acrylate-silane modified emulsion; the acrylate-silane modified emulsion is prepared from the following raw materials, based on the total weight of the raw materials, which contain: 10-20 wt% hard monomers, 20-30 wt% soft monomers, 1-3 wt% double-bonded silane coupling agents, and 1-2 wt% functional monomers; the crosslinking agent is an epoxy-siloxane crosslinking agent with a total functionality ≥2; the true density of the hollow glass microspheres is 0.15-0.20 g·cm³. -3 The average particle diameter is 20-80 μm.

2. The composition according to claim 1, characterized in that, The inorganic aerogel coating is selected from at least one of AG-C20, AG-C25, and AG-C30; And / or, the crosslinking agent is selected from at least one of KS-330 and KH-560; And / or, the glass transition temperature of the acrylate-silane modified emulsion is -25°C to -15°C; And / or, the acrylate-silane modified emulsion is a product prepared by a method comprising the following steps: S1: In the presence of a solvent, the components in the modified material are first mixed to obtain material I; based on the total weight of the modified material, the modified material contains 10-20wt% hard monomer, 20-30wt% soft monomer, 1-3wt% double-bonded silane coupling agent, and 1-2wt% functional monomer. S2: Material I is emulsion polymerized with potassium persulfate to obtain intermediate I; the amount of potassium persulfate used is 0.3-0.5 wt% based on the total weight of the modified material. S3: Adjust the pH value of intermediate I to 7-8 to obtain the acrylate-silane modified emulsion; And / or, in step S2, the conditions for emulsion polymerization include: a temperature of 75-80°C and a time of 3-4 hours.

3. The composition according to claim 2, characterized in that, In step S1, the hard monomer is selected from at least one of methyl methacrylate, styrene, isobornyl methacrylate, cyclohexyl methacrylate, and tert-butyl methacrylate. And / or, in step S1, the soft monomer is selected from at least one of butyl acrylate, isooctyl acrylate, n-octyl acrylate, lauryl acrylate, and ethylhexyl acrylate; And / or, in step S1, the double-bonded silane coupling agent is selected from at least one of γ-methacryloxypropyltrimethoxysilane, γ-methacryloxypropyltriethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, and vinyltri(2-methoxyethoxy)silane; And / or, in step S1, the functional monomer is selected from at least one of acrylic acid, hydroxyethyl methacrylate, methacrylic acid, N-hydroxymethylacrylamide, and glycidyl methacrylate.

4. The composition according to claim 1, characterized in that, Based on 100 parts by weight of the total composition, the additive contains 0.5-1.0 parts by weight of dispersant; 0.1-0.4 parts by weight of defoamer; 0.3-0.5 parts by weight of rheology modifier; and 0-6 parts by weight of flame retardant.

5. A method for preparing an inorganic aerogel layer, wherein the method is carried out using each component of the composition according to any one of claims 1-3, characterized in that, The method includes: (1) Material I, containing the first main agent and the first auxiliary agent, is mixed and reacted with the second main agent and the second auxiliary agent to obtain material II; The first main agent and the second main agent together form the main agent in the composition, and the first auxiliary agent and the second auxiliary agent together form the auxiliary agent in the composition; The first main agent contains inorganic aerogel coating, water and hollow glass microspheres, and the first auxiliary agent contains a dispersant; The second main agent contains a modified acrylate emulsion and a crosslinking agent, and the second auxiliary agent contains an antifoaming agent and a rheology modifier. Optionally, the second auxiliary agent also contains a flame retardant. (2) Apply material II to at least one side of the substrate and dry it to obtain the inorganic aerogel layer.

6. The method according to claim 5, characterized in that, In step (1), the conditions for the mixing reaction include: a rotation speed of 400-4000 rpm and a time of 5-30 min; And / or, in step (2), the drying process is a gradient drying process; And / or, the conditions for the gradient drying process include: drying at a first temperature and then drying at a second temperature; the first temperature is 30-50°C lower than the second temperature.

7. The inorganic aerogel layer prepared by the method of claim 5 or 6.

8. An inorganic aerogel waterproof membrane, characterized in that, The waterproof membrane contains the inorganic aerogel layer as described in claim 7.

9. The waterproof membrane according to claim 8, characterized in that, The waterproof membrane also contains an isolation layer and an adhesive layer; And / or, the waterproof membrane contains an isolation layer, an adhesive layer, and an inorganic aerogel layer stacked sequentially.

10. The waterproof membrane according to claim 9, characterized in that, The thickness ratio of the isolation layer, the adhesive layer, and the inorganic aerogel layer is 1:6-10:7-13.

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