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A kind of silicon dioxide thermal insulation composite material and preparation method thereof

A technology of silica and composite materials, applied in the field of thermal insulation materials, can solve the problems of high brittleness, cumbersomeness, and difficulty in realizing industrialization.

Active Publication Date: 2020-10-16
上海瑞太久合高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a silica heat-insulating composite material and its preparation method, which solves the problem that the fiber-reinforced silica airgel composite material in the prior art is brittle, easy to drop powder, and the preparation method is cumbersome and difficult to realize industrialization The problem

Method used

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  • A kind of silicon dioxide thermal insulation composite material and preparation method thereof
  • A kind of silicon dioxide thermal insulation composite material and preparation method thereof
  • A kind of silicon dioxide thermal insulation composite material and preparation method thereof

Examples

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Embodiment 1

[0067] The preparation method of a kind of silicon dioxide thermal insulation composite material of the present invention, according to the attached figure 1 The described process includes the following steps:

[0068] 1) In a 1.5L stirrer, put 500 parts of methanol, 20 parts of 3-aminopropyltrimethoxysilane, and 3 parts of methyltrimethoxysilane in sequence;

[0069] 2) Slowly add 500 parts of fumed silica powder to the above-mentioned agitator, stir evenly to obtain a viscous mixture, place it at room temperature for a period of time, and set aside;

[0070] 3) Take glass fiber and add it to the above-mentioned agitator. The length of the glass fiber is 30mm, the diameter of a single fiber is 8-12μm, and the mass fraction of the glass fiber is 70 parts. When adding, the agitator is in a slow stirring state. Slowly add to the blender, after the addition is complete, continue to stir to obtain a paste mixture;

[0071] 4) Continue crushing, extruding and stirring the above-m...

Embodiment 2

[0075] A method for preparing a silica heat-insulating composite material of the present invention comprises the following steps:

[0076] 1) In a 1.5L stirrer, add ethanol, dimethyl sulfoxide, γ-glycidyl etheroxypropyl trimethoxysilane, and dimethyldimethoxysilane in sequence, and the addition amounts are 200 parts and 300 parts respectively parts, 90 parts, 5 parts, stir to make it evenly mixed, and put it in the refrigerator;

[0077] 2) When the temperature of the liquid in the above-mentioned refrigerator is 0°C, take out the liquid from the refrigerator, slowly add 10 parts of microcrystalline cellulose into the stirrer to obtain a cloudy liquid, and stir at a high speed of 1500 rpm for 20 minutes ;

[0078] 3) Slowly add 600 parts of silica powder to the mixed liquid obtained in step 2), and stir to obtain a viscous liquid mixture, which is defoamed by a defoaming machine;

[0079] 4) Take the thickness as 5mm and the density as 0.12g / cm 3 The glass fiber felt is cut...

Embodiment 3

[0083] In the preparation method of a silica heat-insulating composite material of the present invention, on the basis of Example 1, the glass fiber is replaced with activated carbon filter cotton, the activated carbon filter cotton has a diameter of 11-18 μm and a specific surface area of ​​800-1600 m 2 / g, single fiber length 3-5mm, carbon content ≥ 80%; On the basis of embodiment 1, the organic solvent is changed from methanol to ethanol, wherein, the index of ethanol is: ethanol content ≥ 95%, the quality of water Fraction ≤ 0.3%, the mass fraction of methanol ≤ 0.05%, the mass fraction of isopropanol ≤ 0.01%.

[0084] The thermal insulation composite board obtained in this example has a smooth surface, certain elasticity and flexibility, and a density of 0.2g / cm 3 , When vibrating under the pressure of 3MPa, no dust falls, the strain energy is 1.5MPa when the compressive strength is 10%, and the thermal conductivity is 0.025W / m·k.

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Abstract

The invention provides a silica heat-insulation composite material and a preparation method thereof. The silica heat-insulation composite material is prepared from the following raw materials: 100wt%of silica powder, 0.5mol% to 20mol% of modifier, 50wt% to 400wt% of organic solvent, 5wt% to 200wt% of reinforcing fiber, 0wt% to 20wt% of opacifier, 0mol% to 10mol% of cross-linking agent and 0wt% to3wt% of thickener. The invention also provides the preparation method of the heat-insulation composite material. An organic-solvent solution of the modifier is added into the silica powder; the reinforcing fiber is added; the agitation and the setting are carried out; the organic solvent is volatilized; curing is carried out, so as to obtain the composite material. The silica heat-insulation composite material is obtained by using the silica powder as a raw material, modifying the silica powder with the modifier, adding the reinforcing fiber, then directly setting, volatilizing the solvent and curing; the preparation method is simple; the procedure is short; problems that the raw material is expensive, a product is fragile and powder falls, and the like, are solved and the silica heat-insulation composite material is suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials, in particular to a silica thermal insulation composite material and a preparation method thereof. Background technique [0002] Porous materials have always been the favorite in the field of thermal insulation. With the development of nanotechnology, nanoporous materials have opened up new application fields for thermal insulation materials. The most representative solid material with the best thermal insulation performance among various nano-insulation materials is silica aerogel, which has a very high specific surface area (500m 2 / g above), very low density (0.2g / cm 3 Below) and extremely low thermal conductivity (0.01-0.03w / m·k) are highly appreciated. However, although silica airgel has such good performance, it also has obvious disadvantages such as high cost, long production cycle, brittleness and dust generation during use, thus limiting its application field. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02
CPCC04B30/02C04B2201/20C04B2201/32C04B2201/50C04B24/42C04B24/026C04B14/42C04B14/064C04B24/00
Inventor 金光虎
Owner 上海瑞太久合高新材料有限公司
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