Preparation method of carbon fibre reinforced cast nylon composite material

A technology of composite materials and cast nylon, which is applied in the field of material science, can solve the problems of low mechanical strength and difficulty in meeting the material performance requirements of large workpieces, etc.

Inactive Publication Date: 2003-05-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, its lower mechanical strength compared with steel materials makes it difficult to meet the material performance requirements of large workpieces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The carbon fiber reinforced monolithic cast nylon composite was prepared according to the following steps:

[0015] (1) Pretreatment of carbon fiber: Take the carbon fiber to be treated, soak it in 50% nitric acid solution, take it out after one hour, and then fully wash it with sodium hydroxide solution and water until the pH value is not acidic.

[0016] (2) Mix the treated carbon fiber and caprolactam monomer evenly, wherein the carbon fiber is added in an amount of 5%, and the average length-diameter ratio is 10:1, put into a container and heated to about 120 ° C to melt the material, and the container is vacuumized and dehydrated , the vacuum degree is 10 -1 Pa;

[0017] (3) open the valve, release the vacuum, add catalyst sodium hydroxide, add-on: the molar ratio to the monomer is 0.002:1, and vacuum to 10 -1 Pa, heated to 130°C;

[0018] (4) open the valve, release the vacuum, add the activator toluene diisocyanate, the amount of addition: the mol ratio with t...

Embodiment 2

[0021] The carbon fiber reinforced monolithic cast nylon composite was prepared according to the following steps:

[0022] (1) Pretreatment of carbon fiber: soak the carbon fiber to be treated in 55% nitric acid solution, take it out after one hour, and then fully wash it with sodium hydroxide solution and water until the pH value is not acidic.

[0023] (2) Mix the treated carbon fiber and caprolactam monomer evenly, wherein the carbon fiber is added in an amount of 10%, and the average length-diameter ratio is 10:1, put it in a container and heat it to about 120 ° C, so that the material is melted, and the container is vacuumized and dehydrated , the vacuum degree is 10 -2 Pa;

[0024] (3) open the valve, release the vacuum, add catalyst sodium hydroxide, add-on: the molar ratio to the monomer is 0.002:1, and vacuum to 10 -2 Pa, heated to 130°C;

[0025] (4) open the valve, release the vacuum, add the activator toluene diisocyanate, the amount of addition: the mol ratio w...

Embodiment 3

[0028] The carbon fiber reinforced monolithic cast nylon composite was prepared according to the following steps:

[0029] (1) Pretreatment of carbon fiber: soak the carbon fiber to be treated in 60% nitric acid solution, take it out after one hour, and then fully wash it with sodium hydroxide solution and water until the pH value is not acidic.

[0030] (2) Mix the treated carbon fiber and caprolactam monomer evenly, wherein the carbon fiber is added in an amount of 15%, and the average length-diameter ratio is 10:1, put it in a container and heat it to about 120 ° C, so that the material is melted, and the container is vacuumized and dehydrated , the vacuum degree is 10 -3 Pa;

[0031] (3) open the valve, release the vacuum, add catalyst sodium hydroxide, add-on: the molar ratio to the monomer is 0.003:1, vacuum to 10 -3 Pa, heated to 130°C;

[0032] (4) open the valve, release the vacuum, add the activator toluene diisocyanate, the add-on: the mol ratio with the monomer ...

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Abstract

The present invention belongs to the field of material science and technology, and includes the following steps: pretreatment of carbon fibre, soaking carbon fibre to be treated in nitric acid solution, then using sodium hydroxide solution and water to fully wash until its pH value is not acidic, uniformly mixing the treated carbon fibre with caprolactam monomer, placing the obtained mixture into a container, heating and making the material melt, evacuating said container and dehydrating, adding catalyst soldium hydroxide, heating and melting, adding activating agent tolylene diisocyanate, and pouring the above-mentioned material into mould, heat-insulating and demoulding so as to obtain the invented product with excellent mechanical properties of higher tensile-strength and bending strength and raised frictional property.

Description

technical field [0001] The invention belongs to the technical field of material science and relates to a preparation method of a cast nylon composite material. Background technique [0002] Cast nylon is to use the molten raw caprolactam monomer as a catalyst under normal pressure, and together with activators and other additives, directly inject it into a mold that is preheated to a certain temperature, and the material is quickly in the mold. The polymerization reaction proceeds and coagulates into a white tough solid blank. The characteristics of cast nylon are: light weight, the density is generally 1.15 ~ 1.16; vibration and noise reduction; good resilience; wear resistance and self-lubrication, suitable for use in conditions where no lubricant can be added; The mechanical properties, mechanical strength is much higher than ordinary nylon, good toughness, impact resistance, fatigue resistance. Cast nylon is used as a wear-resistant and self-lubricating engineering pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/06C08K7/06
Inventor 李国禄王昆林刘家浚
Owner TSINGHUA UNIV
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