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Silicon dioxide aerogel coating and preparation method thereof

A technology of silica and airgel, which is applied in the field of heat insulation and heat preservation materials, can solve the problems that professionals cannot realize, cannot realize, and poor thermal conductivity, so as to avoid difficult dispersion, good heat insulation effect, and structural collapse enhanced effect

Inactive Publication Date: 2018-05-29
XINHUASHENG ENERGY SAVING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Publication number is that the patent literature of CN106433270A has announced a kind of airgel coating of infrared reflection, and its thermal conductivity is worse, and the best is 0.038W / m K, and its announced formula (silica airgel powder : Infrared reflective material: water-based coating=1:0.1-1:0.05-0.15) and production process, cannot be realized as technicians in the same field
As we all know, silica airgel powder is a porous material that easily absorbs water. Generally, 1 kg of airgel powder requires more than 4 kg of water to be mixed into a paste. The patent document with publication number CN106433270A is in the specification The proportions and examples provided in , are simply impossible for professionals to realize

Method used

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  • Silicon dioxide aerogel coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of silica wet gel (take the patent document with publication number CN 103833041A as an example, but not limited to the above-mentioned patent document): add 60L of tetraethyl orthosilicate (TEOS) into a reaction kettle with 200L of ethanol After stirring at 200 rpm for 30 minutes, slowly add 2.5mol / L hydrochloric acid solution to adjust the pH value of the solution to about 3.5. After continuing to stir for 30 minutes, the reaction kettle was heated to a solution temperature of 45° C. and kept at a constant temperature for 24 hours. Add 3mol / L ammonia solution under stirring at 200 rpm, adjust the pH value of the system to about 7.5, keep stirring for 15 minutes, keep at a constant temperature of 45°C for 4 hours, add 30% content of γ-glycidyl ether propyl during stirring An aqueous solution of trimethoxysilane (gamma-glycidyl ether propyl trimethoxysilane stabilizer is added in an amount of 5-10% of the silica content), heated to 60° C. and stabilized for ...

Embodiment 2

[0027] The silica wet gel production process is the same as Case 1.

[0028] Add 1,000 kg of silica wet gel to the stirring tank, stir at 200 rpm, add 80 kg of 20% aluminum sol, 200 kg of silicone acrylic resin emulsion of RF2072, 4 kg of anti-mold and bactericide LXE, fiber 0.1 kg of plain thickener HEC, 5 kg of UH-420 polyurethane thickener, stir at 500 rpm for more than 30 minutes, add 5 kg of deionized water, and stir at 150 rpm for 10 minutes to complete the finished coating, which can be used in metal buckets or Filled in plastic barrels, the shelf life is more than 6 months.

[0029]The silicone acrylic resin emulsion RF2072 used was produced by Beijing Baowei Latex Company, and the polyurethane thickener UH-420 was produced by Japan Asahi Kawasaki Co., Ltd.

[0030] The resulting coating has a density of 0.95 g / ml, a viscosity of 1800 mPa·s, and a thermal conductivity of the coating of 0.021 W / m·K (GB / T22588-2008).

[0031] The paint obtained above is sprayed on the ...

Embodiment 3

[0033] The silica wet gel production process is the same as Case 1.

[0034] Add 1,000 kg of silica wet gel to the stirring tank, stir at 300 rpm, add 60 kg of 30% silica sol, 150 kg of RF2072 silicone acrylic resin, 4 kg of anti-mold and fungicide, cellulose thickener HEC 0.1 kg, 5 kg of UH-420 polyurethane thickener, stirring for more than 30 minutes, adding 3 kg of deionized water, stirring at 150 rpm for 10 minutes to complete the finished coating, which can be filled in metal buckets or plastic buckets, with a shelf life of 6 months above.

[0035] The silicone acrylic resin emulsion used was produced by Beijing Baowei Latex Company, and the polyurethane thickener was produced by Japan Asahi Kawasaki Co., Ltd. The resulting coating has a density of 0.93 g / ml, a viscosity of 1500 mPa·s, and a thermal conductivity of the coating of 0.019 W / m·K (GB / T22588-2008).

[0036] The paint obtained above is sprayed on the wood with an air sprayer, the thickness of the coating is 0....

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Abstract

The invention discloses a silicon dioxide aerogel coating and a preparation method thereof. The coating is prepared from the following ingredients in parts by weight: 100 parts of silicon dioxide wetgel, 20-50 parts of auxiliary film forming matter, 0.3-0.5 part of mildewproof microbicide and 0.1-2.0 parts of thickening leveling agent. The preparation method comprises the steps of weighing the silicon dioxide wet gel, adding the auxiliary film forming matter, the mildewproof microbicide and a thickener at a low speed with low-speed stirring, carrying out stirring for 30 minutes or more, adding a proper volume of distilled water or deionized water, and adjusting the viscosity of the coating to about 1,500mPa.s, thereby obtaining the finished coating. According to the silicon dioxide aerogel coating and the preparation method thereof, concentrated aerogel colloid is directly used as a raw material, thus, the difficult dispersity of aerogel powder materials is avoided, and the possibility of structural damage to aerogel powder after secondary water absorption is also avoided; meanwhile, through adding a structural stabilizer, the problem of structural collapse during drying is overcome, and a reinforcing effect in a later-stage film forming process can also be achieved; and the coefficient of thermal conductivity of a coating film at normal temperature can reach 0.015W / m.K to theminimum, and the light transmittance of the coating film can reach 80% or above.

Description

technical field [0001] The invention relates to a heat-insulating and heat-insulating material, in particular to a silica airgel coating, and also relates to a preparation method of the coating. Background technique [0002] Silica airgel is a light nanoporous amorphous material with controllable structure, which is composed of colloidal particles aggregated with each other. It is the lightest solid material known so far. The minimum density currently made in the laboratory can be as low as 3 kg / m3, industrial production is basically around 10-80 kg / m3. Because of its special continuous three-dimensional network structure, among all solid materials, it has the best thermal insulation performance, low sound transmission rate, low dielectric constant, and large relative area, so it is widely used in thermal insulation materials, acoustic Impedance coupling materials, preparation of high-efficiency rechargeable battery materials, catalysts and their supports, etc. The thermal...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/14C09D7/61C09D7/43C09D7/47C09D7/65C09D133/00
CPCC08K2003/2227C08L2201/10C08L2205/03C09D1/00C09D5/14C09D133/00C09D143/04C08L1/02C08L75/04C08K3/36C08K3/22
Inventor 朱晓辉
Owner XINHUASHENG ENERGY SAVING TECH CO LTD
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