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A kind of preparation method of composite insulation material

A thermal insulation material, hydrogel technology, applied in the direction of coating, etc., can solve the problems of easy combustion, low porosity, fragile texture, etc., and achieve the effect of low thermal conductivity and low density thermal conductivity

Active Publication Date: 2020-10-27
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Inorganic heat insulation materials and organic heat insulation materials have both advantages and disadvantages. Among them, the main problem of inorganic heat insulation materials is that they are relatively fragile in texture, difficult to bear force, low in porosity and high in thermal conductivity; the disadvantage of organic heat insulation materials is that they are not High temperature resistance, easy to burn, easy to release toxic substances, some polymer insulation materials are difficult to degrade after being discarded, causing serious pollution to the environment

Method used

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  • A kind of preparation method of composite insulation material
  • A kind of preparation method of composite insulation material
  • A kind of preparation method of composite insulation material

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preparation example Construction

[0022] Aiming at the shortcomings of organic heat insulation materials and inorganic heat insulation materials in the prior art, this application provides a preparation method of a composite heat insulation material. During the preparation process, the composite heat insulation material is made of organic hydrogel or organic Silica hydrogel is used as a raw material, and the skeleton of the hydrogel is further strengthened by the in-situ hydrolysis reaction of the silane coupling agent, resulting in a composite airgel with high strength, low density and low thermal conductivity. Specifically, the embodiment of the present invention discloses a preparation method of the composite thermal insulation material, including the following steps:

[0023] A) immersing the hydrogel in the catalyst solution for exchange to obtain an initial solution; the hydrogel is selected from one or both of organic matter hydrogels and organic matter / silicon dioxide composite hydrogels;

[0024] B) T...

Embodiment 1

[0036] A) immerse the bacterial cellulose / silica hydrogel in 0.5mol / L ammonia solution for 24 hours and then take it out for use;

[0037] B) Prepare 200mL of 80% ethanol solution of tetraethoxysilane, immerse the bacterial cellulose / silica hydrogel obtained in step A) into it, shake at 32°C and 160rmp for 24h, until the hydrogel is completely solidified ,take out;

[0038] C) Rinse the composite obtained in step B) with 10 mL of n-hexane, then soak it in 200 mL of n-hexane for 24 hours, take it out and dry it at 70° C. to obtain the composite airgel. Such as figure 1 as shown, figure 1 For the photo of the composite airgel prepared in this embodiment, figure 2 It is the surface microscopic photo of the composite material airgel prepared in this embodiment 1. After calculation, it can be known that the density of the composite material airgel prepared in this embodiment is 0.15 g cm -3 .

[0039] Test the mechanical properties of the composite airgel prepared in this emb...

Embodiment 2

[0041] A) Soak the agar hydrogel with a solid content of 1% in 0.5mol / L ammonia solution for 24 hours and then take it out for use;

[0042] B) Prepare 300mL of 80% methyltriethoxysilane hexane solution, immerse the gel obtained in step A) into it, shake at 32°C and 160rmp for 24h, until the hydrogel is completely hardened, take it out;

[0043] C) Rinse the composite obtained in step B) with 20 mL of n-hexane, then soak in 200 mL of n-hexane for 24 hours, take it out and dry it at 80° C. to obtain the composite airgel.

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Abstract

The invention provides a method for preparing a composite heat insulating material. The method comprises the following steps: A) immersing hydrogel in a catalyst solution, and mixing the hydrogel andthe catalyst solution to obtain an initial solution, wherein the hydrogen is selected from one or two of organic matter hydrogel and organic matter / silica compound hydrogel; and B) mixing the initialsolution with a silane coupling agent solution, performing a reaction, mixing the obtained solution with a hydrophobic solvent, performing solvent exchanging, and drying the obtained product to obtainthe composite heat insulating material. The preparation method is characterized in that the organic matter hydrogel or the organic matter / silica compound hydrogel undergoes in-situ hydrolysis and gelation by using the silane coupling agent to obtain silica compounded organic matter gel, and the silica compounded organic matter gel undergoes simple solvent exchanging and drying to obtain lightweight and high-strength fireproof heat insulating organic matter / silica compound aerogel.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a preparation method of a composite heat insulating material. Background technique [0002] With the advent of the energy crisis, energy-saving materials and energy-saving technologies are becoming more and more important, and heat insulation materials are a very important part of energy-saving materials. [0003] At present, thermal insulation materials are mainly divided into two categories: organic thermal insulation materials and inorganic thermal insulation materials. Inorganic insulation materials are divided into two categories: one is natural minerals, such as asbestos and diatomaceous earth, etc.; the other is man-made materials, such as ceramic wool, glass wool, porous insulation bricks and foam materials. Organic insulation materials are also divided into two categories: one is natural organic materials, such as cork, textile fibers, animal hair, etc.; the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/06C08L1/02C08L5/12
CPCC08J7/06C08J7/065C08J2301/02C08J2305/12
Inventor 俞书宏管庆方韩子盟
Owner UNIV OF SCI & TECH OF CHINA
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