Preparation method of mullite fiber/epoxy resin composite material

A technology of mullite fiber and epoxy resin, applied in the field of preparation of mullite fiber/epoxy resin composite material, can solve the problem of material thermal conductivity, limited mechanical properties, difficult to form a thermal network, mullite fiber It is difficult to uniformly disperse and other problems, so as to achieve the effect of improving high and low temperature mechanical properties, easy operation and simple preparation process.

Active Publication Date: 2017-04-26
咸阳瞪羚谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the traditional solution blending method is used to prepare epoxy composite materials, it is difficult to disperse uniformly when the mullite fiber content exceeds a certain amount, and defects are likely to exist; on the other hand, the isolated distribution of mullite fibers in the composite material has a great impact on the thermal conductivity , limited mechanical properties
[0007] So far, there is still a lack of methods that can easily, quickly and effectively prepare epoxy resin nanocomposites with high mullite fiber content and uniform dispersion, and it is difficult for the fibers to form an effective thermal conductivity network in the epoxy resin matrix

Method used

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  • Preparation method of mullite fiber/epoxy resin composite material
  • Preparation method of mullite fiber/epoxy resin composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Add tetraethyl orthosilicate to ethanol at a concentration of 0.8mol / L, then add deionized water, the molar ratio of water to tetraethyl orthosilicate is 3:1, and put the prepared solution at room temperature Under magnetic stirring for 3 days, a transparent silica sol was obtained;

[0033] 2. SiO 2 :Al 2 o 3 : AlF 3 The mass ratio of 1:2:0.8 will correspond to the ratio of Al 2 o 3 Powder and AlF 3 Add the powder into ethanol to obtain a mixed slurry, use zirconia balls as grinding balls, and ball mill for 24 hours to obtain a uniform slurry;

[0034] 3 Mix the corresponding proportion of silica sol and alumina slurry evenly, add 5 mol / L ammonia water, the pH value is 6, and let it stand for 2 hours to obtain 3Al 2 o 3 2SiO2 2 gel, then put the gel into an oven, keep it at 70°C for 24h, and grind it in a crucible to get 3Al 2 o 3 2SiO2 2 Type mullite precursor powder;

[0035] 4. The 3Al obtained in step 3 2 o 3 2SiO2 2 The type mullite precursor po...

Embodiment 2

[0038] 1. Add tetraethyl orthosilicate to ethanol at a concentration of 0.6mol / L, then add deionized water, the molar ratio of water to tetraethyl orthosilicate is 4:1, and put the prepared solution at room temperature Under magnetic stirring for 5 days, a transparent silica sol was obtained;

[0039] 2. SiO 2 :Al 2 o 3 : AlF 3 The mass ratio of 1:3:1.5 will correspond to the ratio of Al 2 o 3 Powder and AlF 3 Add the powder into ethanol to obtain a mixed slurry, use zirconia balls as grinding balls, and ball mill for 24 hours to obtain a uniform slurry;

[0040] 3 Mix the corresponding proportion of silica sol and alumina slurry evenly, add ammonia water with a concentration of 10mol / L, the pH value is 7, and stand for 3 hours to obtain 3Al 2 o 3 2SiO2 2 Gel, and then put the gel in an oven, keep it at 90°C for 12h, and grind it in a crucible to get 3Al 2 o 3 2SiO2 2 Type mullite precursor powder;

[0041] 4. The 3Al obtained in step 3 2 o 3 2SiO2 2 The type m...

Embodiment 3

[0044] 1. Add tetraethyl orthosilicate to ethanol at a concentration of 0.7mol / L, then add deionized water, the molar ratio of water to tetraethyl orthosilicate is 5:1, and put the prepared solution at room temperature Under magnetic stirring for 4 days, a transparent silica sol was obtained;

[0045] 2. SiO 2 :Al 2 o 3 : AlF 3 The mass ratio of 1:2.5:1 will correspond to the proportion of Al 2 o 3 Powder and AlF 3 Add the powder into ethanol to obtain a mixed slurry, use zirconia balls as grinding balls, and ball mill for 24 hours to obtain a uniform slurry;

[0046] 3. Mix the corresponding proportion of silica sol and alumina slurry evenly, add ammonia water with a concentration of 8mol / L, the pH value is 6.5, and stand for 2.5h to obtain 3Al 2 o 3 2SiO2 2 gel, and then put the gel in an oven, keep it at 80°C for 18h, and grind it in a crucible to get 3Al 2 o 3 2SiO2 2 Type mullite precursor powder;

[0047] 4. The 3Al obtained in step 3 2 o 3 2SiO2 2 The ty...

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Abstract

The invention relates to a preparation method of a mullite fiber/epoxy resin composite material and belongs to the technical field of composite materials. According to the preparation method, first, a sol-gel method is adopted for obtaining 3Al2O3.2SiO2 type mullite precursor powder, the obtained powder is subjected to compression molding forming under different pressure, and then blanks of different porosities are obtained; the obtained blanks are subjected to high-temperature sintering to obtain porous mullite ceramics of different porosities, wherein mullite is in a fiber shape and is overlapped mutually; the preheated porous mullite ceramics are put into a mixed solution of epoxy resin, a promoter and a solidifying agent to be kept for certain time, and the mullite fiber/epoxy resin composite material is obtained after solidifying. By control over the volume and density of the porous material, the volume fraction of the mullite fibers in the composite material is regulated; in addition, the mullite fibers in the composite material are in a continuous phase, in this way, the high-temperature and low-temperature mechanical properties and high-temperature creep resistance of the composite material can be substantially improved, and the thermal conductivity of the composite material can be greatly increased.

Description

[0001] Technical field: [0002] The invention belongs to the field of polymer composite materials, and in particular relates to a preparation method of mullite fiber / epoxy resin composite materials. [0003] Background technique: [0004] Due to its excellent adhesion, chemical resistance, electrical insulation, low shrinkage, easy processing and low cost, epoxy resin is widely used in adhesives, coatings, construction, aerospace, electronic packaging and other fields. . However, due to the high crosslinking density of pure epoxy resin after curing, there are disadvantages such as brittleness, large internal stress, and high thermal expansion coefficient, which limit its further application. Doping SiO into epoxy resin matrix 2 、Al 2 o 3 , CaCO 3 , carbon fibers, carbon nanotubes, graphene and other inorganic nano / micro particles can effectively improve the mechanical properties such as Young's modulus and fracture toughness of the material, and can also improve the heat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K9/06C08K7/08C08K7/10
CPCC08K7/08C08K7/10C08K9/06C08L63/00
Inventor 王波曾德军孙帆庾甜甜赵杉杨建锋
Owner 咸阳瞪羚谷新材料科技有限公司
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