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Modified carbon fiber reinforced silicone rubber thermal-insulation material and preparation method thereof

A fiber-reinforced and heat-insulating material technology, applied in the field of heat-insulating materials, can solve problems such as small specific surface area, poor wettability, and inability to form mechanical anchoring

Inactive Publication Date: 2019-01-18
芜湖市颂晖商贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, carbon fiber is a kind of reinforcing filler with good comprehensive performance due to its excellent mechanical properties, high temperature resistance, corrosion resistance and electrical conductivity. However, the surface of untreated carbon fiber is composed of a large number of inert graphite crystallites. Therefore, the surface of the raw silk is polar, the surface energy is small, the wettability with the silicone rubber matrix is ​​poor, and the comprehensive performance of the interface is poor.
In addition, the high-performance carbon fiber has a smooth surface and a small specific surface area, which also prevents effective mechanical anchoring between the fiber and the matrix, and the interface strength between the fiber and the silicone rubber matrix decreases.

Method used

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  • Modified carbon fiber reinforced silicone rubber thermal-insulation material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] This example provides a modified carbon fiber reinforced silicone rubber thermal insulation material, which is prepared from the following raw materials: 50 parts of methyl vinyl silicone rubber, 50 parts of methyl vinyl phenyl silicone rubber, 25 parts of white carbon black part, 6 parts of graphene, 12 parts of modified carbon fiber, vulcanizing agent is 2,5-dimethyl-2, 1.0 part of 5-bis-hexane;

[0022] The preparation method of the modified carbon fiber is: place the carbon fiber in concentrated nitric acid, the mass volume ratio of the carbon fiber to the concentrated nitric acid is 1:50g / ml; treat it in a constant temperature water bath at 100°C for 2h, then place it in PEG6000 and Soak in the mixed aqueous solution of α-aminopropyltriethoxysilane for 4h, then wash to neutral drying; the mass fraction of PEG in the mixed aqueous solution is 3%, the mass fraction of α-aminopropyltriethoxysilane The score is 2%.

[0023] The preparation method of the modified carbo...

Embodiment 2

[0031] This example provides a modified carbon fiber reinforced silicone rubber thermal insulation material, which is prepared from the following raw materials: 40 parts of methyl vinyl silicone rubber, 60 parts of methyl vinyl phenyl silicone rubber, 20 parts of white carbon black part, 10 parts of graphene, 10 parts of modified carbon fiber, vulcanizing agent is 2,5-dimethyl-2, 1.5 parts of 5-bis-hexane;

[0032] The preparation method of the modified carbon fiber is: place the carbon fiber in concentrated nitric acid, the mass volume ratio of the carbon fiber to the concentrated nitric acid is 1:40g / ml; treat it in a constant temperature water bath at 100°C for 2h, then place it in PEG6000 and Soak in the mixed aqueous solution of α-aminopropyltriethoxysilane for 4h, then wash to neutral drying; the mass fraction of PEG in the mixed aqueous solution is 4%, the mass fraction of α-aminopropyltriethoxysilane The score is 1%.

[0033] The preparation method of the modified car...

Embodiment 3

[0041] This example provides a modified carbon fiber reinforced silicone rubber thermal insulation material, which is prepared from the following raw materials: 60 parts of methyl vinyl silicone rubber, 40 parts of methyl vinyl phenyl silicone rubber, 30 parts of white carbon black part, 3 parts of graphene, 15 parts of modified carbon fiber, 0.5 part of 2,4-dimethyl 2,4-bis-hexane;

[0042] The preparation method of the modified carbon fiber is: place the carbon fiber in concentrated nitric acid, the mass volume ratio of the carbon fiber to the concentrated nitric acid is 1:60g / ml; treat it in a constant temperature water bath at 100°C for 2h, then place it in PEG6000 and Soak in the mixed aqueous solution of α-aminopropyltriethoxysilane for 4h, then wash to neutral drying; the mass fraction of PEG in the mixed aqueous solution is 2%, the mass fraction of α-aminopropyltriethoxysilane The score is 3%.

[0043] The preparation method of the modified carbon fiber reinforced sil...

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Abstract

The invention discloses a modified carbon fiber reinforced silicone rubber thermal-insulation material and a preparation method thereof, belonging to the technical field of thermal-insulation materials. The modified carbon fiber reinforced silicone rubber thermal-insulation material is prepared from the following raw materials in parts by weight: 40-60 parts of methyl vinyl silicone rubber, 40-60parts of methyl vinyl phenyl silicone rubber, 20-30 parts of white carbon black, 3-10 parts of graphene, 10-15 parts of modified carbon fibers and 0.5-1.5 parts of a vulcanizing agent. After carbon fibers are processed by virtue of concentrated nitric acid, the surface roughness of the carbon fibers is increased, and oxygen-containing functional groups are increased; after the carbon fibers are soaked in PEG6000 and alpha-aminopropyl triethoxysilane, the surfaces of the carbon fibers contain organic functional groups of N and Si. The tensile strength of the silicone rubber added with the modified carbon fibers reaches 2.96MPa, and the elongation at break reaches 57%; and compared with silicone rubber added with unmodified carbon fibers, the tensile strength and the elongation at break aregreatly increased, and the line ablation rate and the quality ablation rate are greatly decreased.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials, in particular to a modified carbon fiber reinforced silicone rubber thermal insulation material and a preparation method thereof. Background technique [0002] Silicone rubber heat insulation material is a heat insulation layer material that has been researched and applied more at home and abroad in recent years. It can form a high-melting point ceramic-like layer during the ablation process. It has good heat resistance and flame retardancy, good oxidation resistance, and small molecule resistance. With the advantages of strong migration ability and strong versatility, it is expected to replace EPDM rubber in the engine afterburning chamber, because the high-speed gas at thousands of degrees Celsius in the engine afterburning chamber poses a great threat to the structural integrity of the engine shell. Therefore, insulation materials must be used to protect the shell from pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08K13/06C08K9/02C08K9/04C08K9/06C08K7/06C08K3/04C08K3/36
CPCC08L83/04C08L2205/025C08K13/06C08K9/02C08K9/08C08K9/06C08K7/06C08K3/042C08K3/36
Inventor 汪琦郭元
Owner 芜湖市颂晖商贸有限公司
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