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Preparation method of silicon carbide reinforced chitosan foam thermal insulation material

A foam insulation material and reinforced shell technology, applied in the field of insulation materials, can solve the problems of poor thermal stability, weak mechanical properties, and poor durability, and achieve good durability and thermal stability, high compressive strength, and reduce production costs. Effect

Pending Publication Date: 2022-03-11
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan has a semi-crystalline structure with weak mechanical properties, poor durability, and poor thermal stability when exposed to high temperatures

Method used

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  • Preparation method of silicon carbide reinforced chitosan foam thermal insulation material
  • Preparation method of silicon carbide reinforced chitosan foam thermal insulation material
  • Preparation method of silicon carbide reinforced chitosan foam thermal insulation material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A preparation method of silicon carbide reinforced chitosan foam insulation material, comprising the following steps:

[0022] (1) 0.9g of chitosan powder with a viscosity of 100mPa·s and 44.1g of acetic acid solution with a concentration of 0.1mol / L were mixed and stirred for 1h to form a uniform mixed solution A, and the mass fraction of chitosan in mixed solution A was 2 %; 0.1g of silicon carbide fibers with a length of 200 μm and a diameter of 100 nm were mixed with 4.9 g of deionized water and stirred for 1 hour to form a uniform mixed solution B. The mass fraction of silicon carbide fibers in the mixed solution B was 2%;

[0023] (2) Mix the mixed solution A and the mixed solution B at a mass ratio of 9:1, and stir for 2 hours to form a uniform mixed solution C;

[0024] (3) ultrasonically disperse the mixed solution C for 30 minutes, remove the air bubbles in the solution and pour it into the mold;

[0025] (4) Put the mold into a freeze dryer at -50°C and free...

Embodiment 2

[0028] A preparation method of silicon carbide reinforced chitosan foam insulation material, comprising the following steps:

[0029] (1) 0.7g of chitosan powder with a viscosity of 200mPa s and 34.3g of acetic acid solution with a concentration of 0.5mol / L were mixed and stirred for 2h to form a uniform mixed solution A, and the mass fraction of chitosan in mixed solution A was 2 %; Mix 0.3g of silicon carbide fibers with a length of 200μm and a diameter of 200nm with 14.7g of deionized water and stir for 1 hour to form a uniform mixed solution B. The mass fraction of silicon carbide fibers in the mixed solution B is 2%;

[0030] (2) Mix the mixed solution A and the mixed solution B at a mass ratio of 2.33:1, and stir for 3 hours to form a uniform mixed solution C;

[0031] (3) ultrasonically disperse the mixed solution C for 25 minutes, remove the air bubbles in the solution and pour it into the mold;

[0032] (4) Put the mold into a freeze dryer at -40°C and freeze it for ...

Embodiment 3

[0035] A preparation method of silicon carbide reinforced chitosan foam insulation material, comprising the following steps:

[0036] (1) 0.5g of chitosan powder with a viscosity of 200mPa·s and 24.5g of acetic acid solution with a concentration of 1mol / L were mixed and stirred for 1.5h to form a uniform mixed solution A, and the mass fraction of chitosan in mixed solution A was 2 %; 0.5g of silicon carbide fibers with a length of 100 μm and a diameter of 100 nm were mixed with 24.5 g of deionized water and stirred for 1.5 hours to form a uniform mixed solution B, and the mass fraction of silicon carbide fibers in the mixed solution B was 2%;

[0037] (2) Mix the mixed solution A and the mixed solution B at a mass ratio of 1:1, and stir for 2.5 hours to form a uniform mixed solution C;

[0038] (3) Ultrasonic disperse the mixed solution C for 10 minutes, remove the air bubbles in the solution and pour it into the mold;

[0039] (4) Put the mold into a freeze dryer at -30°C fo...

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Abstract

The invention relates to a preparation method of a silicon carbide reinforced chitosan foam thermal insulation material. The preparation method comprises the following steps: mixing and stirring chitosan powder and an acetic acid solution for 1-2 hours to form a uniform mixed solution A; silicon carbide fibers and deionized water are mixed and stirred for 1-2 h, and a uniform mixed solution B is formed; mixing the mixed solution A and the mixed solution B, and stirring for 2-3 hours to form a uniform mixed solution C; the mixed solution C is subjected to ultrasonic dispersion for 10-30 min, bubbles are removed, and then the mixed solution C is poured into a mold; putting the mold into a freeze dryer at the temperature of-50 DEG C to 30 DEG C, freezing for 4 to 6h, then vacuumizing and drying for 24 to 36h, and taking out a sample after drying is finished, so as to obtain the silicon carbide reinforced chitosan foam thermal insulation material. The preparation method is simple, raw materials are rich in source and low in price, and the production cost of the thermal insulation material can be reduced; the prepared thermal insulation material has the advantages of low heat conductivity coefficient, high mechanical strength, good durability and thermal stability and the like.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials, and in particular relates to a preparation method of silicon carbide reinforced chitosan foam thermal insulation materials. Background technique [0002] Energy consumption for building heating accounts for more than 10% of global energy consumption, while generating nearly 30% of global carbon dioxide emissions. In order to reduce the energy consumption of building heating, improving the thermal insulation performance of buildings is considered to be one of the cost-effective ways. Insulation materials refer to materials that can block the transfer of heat flow, also known as thermal insulation materials. Traditional thermal insulation materials such as glass fiber, asbestos, rock wool, silicate, etc., and new thermal insulation materials such as airgel blankets, vacuum panels, etc., these traditional thermal insulation materials have relatively high thermal conductivity, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L5/08C08K7/10
CPCC08J9/28C08J9/0085C08J2305/08
Inventor 黄丛亮李东升吕治国胡泽立
Owner CHINA UNIV OF MINING & TECH