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Heat-preservation hard composite carbon fiber felt and preparation method thereof

A technology of hard thermal insulation felt and composite carbon fiber, applied in the direction of layered products, etc., can solve the problems of difficult carbon fiber dispersion, complex dispersion system components, uneven distribution of carbon in thermal insulation felt, etc., and achieve the effect of reducing costs.

Inactive Publication Date: 2015-04-22
SICHUAN CHUANGYUE CARBON MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rigid carbon fiber thermal insulation felt made in this way has a simple process, but the density can be adjusted in a small range, especially the low-density rigid thermal insulation felt cannot be prepared.
Moreover, due to the complex components of the dispersion system, it is difficult to achieve the dispersion of carbon fibers with a relatively large length and diameter. In fact, only short fibers below 1mm can be dispersed, and the fiber density distribution inside the carbon felt is likely to be uneven, so that the carbon distribution inside the insulation felt is uneven after carbonization. Uniform, so that the thermal insulation performance and strength of the product are limited
Pitch carbon fiber needle punching is more complex and requires high strength and toughness of raw materials, which is not conducive to cost optimization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] (1) Forming of carbon fiber vacuum filter layer: 100 parts of isotropic chopped pitch-based carbon fiber with a length of 5 mm, 0.1 part of methyl cellulose, 0.5 part of polyacrylamide, 25 parts of polyvinyl alcohol fiber with a length of 5 mm, 200 mesh 1 part of boron nitride and 5000 parts of water were mixed evenly, poured into a special mold, and formed by suction filtration to obtain a pitch carbon fiber prefabricated felt with a thickness of 38 mm.

[0035] (2) Composite viscose-based carbon fiber felt layer: the same size as the cutting mold is 5mm thick and the density is 0.12g / cm 3 Viscose-based carbon fiber felt, coated with 50% phenolic resin, loaded into the mold and attached to the surface of the preformed pitch-based carbon fiber felt.

[0036] (3) Dipping the binder, needle punching and coating the upper surface treatment layer: prepare 500 parts of phenolic resin with a solid content of 5%, 1 part of carbon black, 1 part of 200 mesh coke powder, 5 parts ...

example 2

[0040] (1) Forming of carbon fiber vacuum filter layer: 20 parts of isotropic chopped pitch-based non-melting fiber with a length of 20 mm, 80 parts of chopped pitch-based carbon fiber with a length of 5 mm, 0.1 part of hydroxyethyl cellulose, and 0.5 parts of polyacrylamide 20 parts of polypropylene fiber with a length of 5 mm, 1 part of 200 mesh boron carbide, and 4000 parts of water, stir evenly, pour in a special mold, and suction filter to obtain a 42 mm thick pitch carbon fiber prefabricated felt with a fiber bulk density of 0.08 g / cm 3 .

[0041] (2) Composite viscose-based carbon fiber felt and polyacrylonitrile-based carbon fiber needle-punched felt layer: the same size as the cutting mold, thickness 10mm, density 0.14g / cm 3 Polyacrylonitrile-based carbon fiber needle felt, coated with 60% phenolic resin, loaded into the mold and attached to the surface of the preformed pitch-based carbon fiber felt. Then cut the mold to the same size, thickness 5mm, density 0.12g / cm...

example 3

[0046] (1) Forming of carbon fiber vacuum filter layer: 10 parts of isotropic chopped pitch-based non-melting fiber with a length of 10 mm, 90 parts of chopped pitch-based carbon fiber with a length of 3 mm, 0.2 parts of carboxymethyl cellulose, and 0.5 parts of polyacrylamide 10 parts of 80-mesh polyethylene particles, 1 part of 200-mesh boron carbide, and 4000 parts of water, stirred evenly, poured into a special mold, and suction-filtered to form a pitch-based carbon fiber prefabricated felt with a thickness of 40mm, and the fiber bulk density was 0.09g / cm 3 .

[0047] (2) Composite viscose-based carbon fiber felt and polyacrylonitrile-based carbon fiber needle-punched felt layer: the same size as the cutting mold, thickness 5mm, density 0.14g / cm 3 Polyacrylonitrile-based carbon fiber felt, coated with 45% phenolic resin, loaded into the mold and attached to the surface of the preformed pitch-based carbon fiber felt. Then cut the mold to the same size as the thickness of 1...

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Abstract

The invention discloses a heat-preservation hard composite carbon fiber felt and a preparation method thereof. The preparation method comprises the following steps: forming a carbon fiber vacuum filtration layer, compositing a viscose-based carbon fiber felt or polyacrylonitrile-based carbon fiber felt, soaking a binding agent, needling, coating an upper surface processing layer, forming and postprocessing. The heat-preservation hard composite carbon fiber felt and the preparation method thereof provided by the invention have the advantages that the cost performance optimization design is carried out on a product according to a specific operating environment, the designability of the density of the whole felt is high, the density of an organic padding is relatively low, a high density fiber stacking structure which is corresponding to a high temperature surface is effectively formed, a heat insulation effect is excellent, a low density fiber stacking structure which is corresponding to a low temperature surface is effectively formed, and the cost is economic.

Description

technical field [0001] The invention relates to a composite carbon fiber rigid thermal insulation felt and a preparation method thereof. Background technique [0002] Carbon fiber rigid insulation felt is a high-end insulation material used in cemented carbide sintering furnaces, monocrystalline silicon furnaces, vacuum smelting furnaces, vacuum heat treatment furnaces, vapor deposition furnaces, etc. Crucial role. [0003] At present, the carbon fiber rigid insulation blankets on the market are mainly polyacrylonitrile-based needle-punched carbon fiber and viscose-based carbon fiber insulation blankets, and there are also a small amount of pitch-based carbon fiber insulation blankets and phenolic-based carbon fiber insulation materials. Polyacrylonitrile carbon fiber felt is cheap, but it is easy to drop slag. Viscose-based insulation felt has good low-temperature heat preservation effect, but its high-temperature ablation resistance and high-temperature heat preservation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B7/08
Inventor 伍孝方进罗松
Owner SICHUAN CHUANGYUE CARBON MATERIAL
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