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SiO2 aerogel/inorganic cotton compound thermal insulation felt and preparation method thereof

A technology of composite thermal insulation and inorganic cotton, which is applied in the field of SiO2 airgel/inorganic cotton composite thermal insulation felt and its normal pressure drying preparation, can solve the problems of different process links, high drying temperature, and no thermal conductivity, etc., to achieve The effect of wide application prospect, strong hydrophobicity and excellent flame retardant performance

Active Publication Date: 2012-10-03
DALIAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

J.Chandradass et al. used industrial water glass as raw material to prepare SiO by normal pressure drying. 2 Airgel / glass wool felt, the raw materials and glass wool used in this document are the same as this patent, but the specific process links are different. In the document, tetraethyl orthosilicate (TEOS) / SiO 2 / ethanol solution soaked glass wool, the process is more loaded down with trivial details, and the modified solution is different from this patent, the drying temperature is higher (230 ℃), and there is no thermal conductivity test result data (Journal ofNon-Crystalline Solid, 2008, 354: 4115-4119 )

Method used

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  • SiO2 aerogel/inorganic cotton compound thermal insulation felt and preparation method thereof
  • SiO2 aerogel/inorganic cotton compound thermal insulation felt and preparation method thereof
  • SiO2 aerogel/inorganic cotton compound thermal insulation felt and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation density is 0.23g / cm 3 SiO 2 Airgel / Glass Wool Composite Thermal Insulation Blanket

[0046] ① Preparation of alumina sol:

[0047] Weigh 20.4g of aluminum isopropoxide, add 200ml of deionized water and stir at 80°C until the aluminum isopropoxide is completely dissolved, then add 0.3ml of concentrated nitric acid, and continue stirring for 3 hours to form alumina sol.

[0048] ② Preparation of silicic acid solution:

[0049] Measure 60ml industrial water glass (modulus=3.38, mSiO 2 %=26, ρ=1.37g / ml) is mixed with 240ml deionized water, after stirring evenly, carry out ion exchange by strongly acidic styrene cation exchange resin, obtain the silicic acid solution of pH=2~3.

[0050] ③Pre-coating treatment of glass wool:

[0051] Put 15.531g of glass wool in a high-temperature sintering furnace and calcinate at 500°C for 2 hours, take it out and weigh 14.426g; take 50ml of the prepared alumina sol and pour it on the pre-fired glass wool to make it ful...

Embodiment 2

[0059] The preparation density is 0.23g / cm 3 SiO 2 Airgel-Inorganic Cotton Composite Thermal Insulation Blanket

[0060] 1. Preparation of alumina sol: same as step 1 of Example 1;

[0061] ② Preparation of silicic acid solution:

[0062] Measure 30ml industrial water glass (modulus=3.38, mSiO 2 %=26, ρ=1.37g / ml) is mixed with 120ml deionized water, after stirring evenly, carry out ion exchange by strongly acidic styrene cation exchange resin, obtain the silicic acid of pH=2~3.

[0063] ③Pre-coating treatment of glass wool:

[0064] Put 18.890g of glass wool in a high-temperature sintering furnace at 500°C for 2 hours, take it out and weigh 16.854g; take 80ml of the prepared alumina sol and pour it on the pre-fired glass wool to make it fully adsorbed, and then Squeeze gently to squeeze out excess alumina sol, then put the glass wool pretreated by alumina sol into an oven, and dry at 80°C for 2 hours.

[0065] ④ Compounding of silicic acid solution and glass wool:

[00...

Embodiment 3

[0072] The prepared density is 0.27g / cm 3 SiO 2 Airgel / Glass Wool Composite Thermal Insulation Blanket

[0073] 1. Preparation of alumina sol: same as step 1 of Example 1;

[0074] ② Preparation of silicic acid solution:

[0075] Measure 40ml industrial water glass (modulus=3.38, mSiO 2 %=26, ρ=1.37g / ml) mixed with 160ml deionized water, after stirring evenly, carry out ion exchange by strongly acidic styrene cation exchange resin, obtain the silicic acid of pH=2~3.

[0076] ③Pretreatment of glass wool:

[0077] Put 16.957g of glass wool in a high-temperature sintering furnace at 500°C for 2 hours, take it out and weigh 15.846g; take 110ml of the prepared alumina sol and pour it on the pre-fired glass wool to make it fully adsorbed, and then Squeeze gently to squeeze out excess alumina sol, then put the pretreated glass wool into an oven and dry at 80°C for 2h.

[0078] ④ Compounding of silicic acid solution and glass wool:

[0079] Take 160ml of the prepared silicic ac...

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Abstract

The invention relates to a SiO2 aerogel / inorganic cotton compound thermal insulation felt and a preparation method of the SiO2 aerogel / inorganic cotton compound thermal insulation felt. The method comprises the following steps of: compounding silica sol and inorganic cotton; ageing the silica sol and the inorganic cotton; carrying out modification and solvent replacement processing; and drying at normal pressure to obtain the SiO2 aerogel / inorganic cotton compound thermal insulation felt. The preparation method of the SiO2 aerogel / inorganic cotton compound thermal insulation felt, which is disclosed by the invention, is characterized in that cheap and easily-obtained industrial raw materials, such as industrial sodium silicate, industrial silica sol, glass wool, rock wool and mineral wool are adopted, the production cost can be lowered, and the ordinary pressure drying technology is convenient and easy to realize, is simple to operate and is suitable for large-scale industrial production. Meanwhile, the product is nontoxic and harmless and does not pollute the environment.

Description

technical field [0001] The invention relates to a SiO with low density and low thermal conductivity 2 Airgel / inorganic cotton composite thermal insulation blanket and its preparation method by normal pressure drying. Background technique [0002] Building energy-saving insulation materials mainly include insulation materials with polystyrene as the main raw material, such as extruded polystyrene foam board (XPS), molded polystyrene foam board (EPS), sprayed polystyrene (SPS), and Insulation materials such as polyurethane foam (PUR). However, existing thermal insulation materials such as polyphenylene and polyurethane have problems such as poor flame retardancy and dense smoke in case of fire. [0003] Silicon dioxide (SiO 2 ) airgel is a new type of lightweight nanoporous material, which has the characteristics of high specific surface area, high porosity and low thermal conductivity, and has excellent thermal insulation performance. In order to obtain the porous structu...

Claims

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Application Information

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IPC IPC(8): C04B28/24C04B14/38
Inventor 史非王晓杰刘敬肖白麓楠
Owner DALIAN POLYTECHNIC UNIVERSITY
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