Method for modifying aramid fiber composite by subzero treatment

A fiber composite material, cryogenic treatment technology, applied in the field of high-performance fiber composite material modification, to achieve the effect of improving bending performance, convenient operation, and good bonding interface

Inactive Publication Date: 2014-12-24
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] So far, there have been few reports on the application of cryogenic treatment to the modification of aramid fiber composites.

Method used

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  • Method for modifying aramid fiber composite by subzero treatment
  • Method for modifying aramid fiber composite by subzero treatment
  • Method for modifying aramid fiber composite by subzero treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for modifying an aramid fiber composite material by cryogenic treatment, the aramid fiber composite material is an aramid fiber (Kevlar-29) non-woven fabric reinforced epoxy composite material, which includes a matrix resin and a matrix resin The volume ratio of aramid fiber used as reinforcement, matrix resin and aramid fiber is 50:50. The matrix resin is epoxy resin, and the aramid fiber is Kevlar-29, which is arranged in the matrix resin in the form of aramid nonwoven fabric. The aramid composite material is self-prepared, aramid parameters: fiber length 3 cm-6 cm, fiber monofilament diameter 12 microns; fabric structure: needle-punched non-woven felt; epoxy resin grade: JL-235. The preparation method is as follows: a vacuum-assisted resin transfer molding method is adopted. Specific steps: Put 4 layers of aramid fabric into the mold. During the vacuum-assisted molding process, the conduit on one side of the vacuum mold is inserted into the epoxy resin with...

Embodiment 2

[0035] A method for modifying an aramid fiber composite material by cryogenic treatment, wherein the aramid fiber composite material is a two-dimensional aramid fiber (Kevlar-129) woven epoxy composite material, which includes a matrix resin and is located in the matrix resin The volume ratio of aramid fiber used as reinforcement, matrix resin and aramid fiber is 55:45. The matrix resin is epoxy resin, and the aramid fiber is Kevlar-129, which is set in the matrix resin in the form of aramid two-dimensional fabric. The aramid composite material is self-prepared. Aramid fabric parameters: K-129 fibers with warp and weft thickness of 1000D, warp and weft density of 5 threads / cm, fabric structure: two-dimensional plain weave fabric; epoxy resin grade: JL- 235. The preparation method adopts the vacuum-assisted resin transfer molding method, and the specific steps are the same as in Example 1. Composite material sample size is: length 30 cm, width 25 cm, thickness 4 mm.

[0036]...

Embodiment 3

[0041] A method for modifying an aramid fiber composite material by cryogenic treatment, the aramid fiber composite material is a two-dimensional aramid fiber (Technora) woven unsaturated polyester composite material, which includes a matrix resin and a matrix resin The volume ratio of aramid fiber used as reinforcement, matrix resin and aramid fiber is 55:45. The matrix resin is unsaturated polyester, and the aramid fiber is Technora, which is set in the matrix resin in the form of aramid two-dimensional fabric. The aramid composite material is self-prepared. Aramid fabric parameters: Technora fibers with warp and weft thickness of 1500D, warp and weft density of 5 threads / cm, fabric structure: two-dimensional plain weave fabric; unsaturated polyester resin grade: 901VP. The preparation method adopts the vacuum-assisted resin transfer molding method, and the specific steps are the same as in Example 1. Composite material sample size is: length 30 cm, width 25 cm, thickness 4...

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Abstract

The invention provides a method for modifying an aramid fiber composite by subzero treatment. The method is characterized by specifically comprising the following steps: placing an aramid fiber composite sample in subzero treatment equipment with a subzero medium, closing a container for performing subzero treatment, wherein the subzero treatment temperature is constant temperature from -100 DEG C to -200 DEG C, and the subzero treatment time is 1-15 hours; and after subzero treatment, performing temperature returning by program warming or taking the sample out from the subzero treatment equipment and naturally performing temperature returning. The tensile property, the bending property, the interlaminar shear property and the wear resisting property of the aramid fiber composite subjected to the subzero treatment are improved, the comprehensive performance is relatively excellent, the application requirements in different fields can be met, and the service life of the aramid fiber composite is prolonged.

Description

technical field [0001] The invention relates to a method for modifying an aramid fiber composite material through cryogenic treatment, and belongs to the field of modification of high-performance fiber composite materials. Background technique [0002] Aramid fiber (aramid fiber) is the fastest growing high-performance chemical fiber in the world. It has excellent mechanical and dynamic properties such as high specific strength, high specific modulus, low density, wear resistance, impact resistance, and fatigue resistance; good chemical corrosion resistance, high temperature resistance, low expansion, low electrical conductivity, It has attracted widespread attention due to its outstanding thermal properties such as non-combustibility and non-melting, as well as excellent dielectric properties. As a fiber-reinforced composite material, it has more significant advantages than glass fiber-reinforced composite materials in terms of density and strength, so it is widely used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C71/00
Inventor 许福军张荫楠陈枫邱夷平
Owner DONGHUA UNIV
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