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Hydrophobic heat-preserving and heat-insulating paper and preparation method thereof

A technology of thermal insulation and hydrophobicity, applied in chemical instruments and methods, paper, papermaking, etc., can solve the problems of low mechanical strength, poor fiber heat insulation effect, large range of use and limited objects, etc., and achieve mechanical strength High efficiency, compact production site, improved application value and application range

Inactive Publication Date: 2017-11-03
浙江贝来新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention proposes a kind of hydrophobic thermal insulation paper, which solves the defects of poor fiber thermal insulation effect, low mechanical strength, and large range of use and object limitations in existing thermal insulation materials.

Method used

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  • Hydrophobic heat-preserving and heat-insulating paper and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Continuous separate spray-gel process:

[0050] a. the preparation raw material methyl orthosilicate, methyl alcohol, pure water, hydrochloric acid of predetermined molar mass proportioning are formulated into sol; Wherein, the molar mass proportioning of methyl orthosilicate, methyl alcohol, pure water and hydrochloric acid is 1: 1:1:0.0005;

[0051] b. Put the quartz fiber paper flat into the spraying equipment and pass through the sol spraying area and the basic catalyst spraying area successively at a speed of 15m / hr, and spray the sol at a flow rate of 40m / hr and with a flow rate of 8m / hr Flow spraying alkaline catalyst; wherein the molar mass ratio of methyl orthosilicate to hydroxide solution is 1:0.0005;

[0052] c. After retaining at 25° C. for 4 hours, silica nanoporous airgel was formed on the quartz fiber paper. It should be noted that the spraying equipment of the present invention can adopt the spraying equipment on the market.

[0053] Supercritical dr...

Embodiment 2

[0061] Continuous separate spray-gel process:

[0062] a. the preparation raw material orthosilicate ethyl ester, ethanol, pure water, sulfuric acid of predetermined molar mass proportioning are formulated into sol; Wherein, the molar mass proportioning of orthosilicate, ethanol, pure water, sulfuric acid is 1: 10:10:0.1;

[0063] b. Put the mullite fiber paper flat into the spray equipment and pass through the sol spray area and the basic catalyst spray area successively at a speed of 20m / hr, and spray the sol at a flow rate of 50ml / hr and spray the sol at a rate of 10ml / hr. The flow rate of hr sprays the alkaline catalyst; the molar mass ratio of methyl orthosilicate to the hydroxide solution is 1:0.1;

[0064] c. After retaining at a temperature of 60° C. for 8 hours, a silica nanoporous airgel is formed on the mullite fiber paper. It should be noted that the spraying equipment of the present invention can adopt the spraying equipment on the market.

[0065] Supercritica...

Embodiment 3

[0073] Continuous separate spray-gel process:

[0074] a. Prepare raw materials orthosilicate, isopropanol, pure water, and nitric acid with a predetermined molar mass ratio to prepare a sol; wherein, the molar mass of orthosilicate, isopropanol, pure water, and nitric acid The ratio is 1:5.5:5.5:0.05;

[0075] b. Put the quartz fiber paper flat into the spray equipment and pass through the sol spray area and the basic catalyst spray area successively at a speed of 17.5m / hr, and spray the sol at a flow rate of 45ml / hr and 9ml / hr The flow rate sprays the alkaline catalyst; wherein the molar mass ratio of methyl orthosilicate to the hydroxide solution is 1:0.05;

[0076] c. After retaining at a temperature of 47.5° C. for 6 hours, silica nanoporous airgel was formed on the quartz fiber paper. It should be noted that the spraying equipment of the present invention can adopt the spraying equipment on the market.

[0077] Supercritical drying process:

[0078] a. The inorganic ...

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Abstract

The invention discloses a hydrophobic thermal insulation paper, comprising: a base material layer; silicon dioxide nanoporous airgel is attached to the base material layer, the base material layer adopts inorganic fiber paper, and the The silicon nanoporous airgel has a specific surface of 400g / m2-800g / m2, a density of 0.015g / cm3-0.20g / cm3, a porosity of 80%-95%, and a pore size of 30nm-100nm. In the present invention, silica airgel with a nano-network pore structure is compounded on inorganic fiber paper to form thermal insulation paper, which not only retains the original characteristics of high temperature resistance and non-combustibility, but also greatly reduces the overall thermal conductivity, significantly Improved thermal insulation properties. In addition, silica airgel has good hydrophobic properties, thus further expanding the advantages of the material, and greatly improving its application value and application range. The product of the invention has the advantages of high temperature resistance, no burning in case of fire, good hydrophobicity, low thermal conductivity, etc., and excellent thermal insulation effect.

Description

technical field [0001] The invention relates to the field of thermal insulation materials, in particular to a hydrophobic thermal insulation paper and a preparation method thereof. Background technique [0002] At present, inorganic fiber paper does not contain organic material components, so it can withstand high temperatures and will not be burned, but its thermal conductivity is limited, which cannot meet the requirements for heat insulation in small spaces. [0003] Silica airgel is a new type of lightweight nanoporous material, which has the characteristics of low density, large specific surface area, and high porosity. It is a new type of nanomaterial with broad application prospects. The nano-network pore structure of silica aerogels, the numerous nanopores and the pore size are smaller than the mean free path of thermal motion of gas molecules, which effectively limits solid-phase heat transfer and convective heat transfer and gas molecules. Thermal motion heat tran...

Claims

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Application Information

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IPC IPC(8): D21H19/14D21H21/14D21H21/16D21H23/50D21H25/06C01B33/16
CPCD21H19/14C01B33/163D21H21/14D21H21/16D21H23/50D21H25/06
Inventor 王荣海王宏宁
Owner 浙江贝来新材料有限公司
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