Preparation method of environment-friendly polyimide insulating composite with high temperature resistance

An insulating composite material, polyimide technology, applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, insulators, organic insulators, etc., can solve the impact of product dielectric properties, low online concentration, high product uniformity problems, to achieve the effect of improving the uniformity of the tissue structure, avoiding the influence, and reducing the difficulty of processing

Inactive Publication Date: 2017-12-01
连云港纤维新材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems that the low concentration of slurry in the preparation process of the composite material affects the molding of the composite material and the addition of chemical additives affects the environmental pollution and the dielectric properties of the product, and provides a method for preparing an environmentally friendly polyimide high temperature resistant insulation The new method of composite materials adopts the wet forming process and is formed in the inclined wire former to achieve the purpose of low netting concentration and high product uniformity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, a preparation method of an environment-friendly polyimide high temperature resistant insulating composite material:

[0023] (1) Disperse polyimide fibers in a fiber discrete device to obtain a suspension containing polyimide chopped fibers, and dilute with water;

[0024] (2) Use a beater to beat the pulp, then add it to the suspension containing chopped fibers, and mix evenly to obtain a pulp suspension;

[0025] (3) The slurry suspension is formed by a wet process on an inclined wire former to obtain an intermediate product of polyimide high temperature resistant insulating composite material;

[0026] (4) The intermediate product is subjected to hot-pressing treatment, and after cooling, the finished product of polyimide high-temperature-resistant insulating composite material is obtained;

Embodiment 2

[0027] Embodiment 2, a preparation method of an environment-friendly polyimide high temperature resistant insulating composite material: comprising the following steps:

[0028] (1) Disperse polyimide fibers in a fiber discrete device to obtain a suspension containing polyimide chopped fibers, which is diluted with water; the length of the chopped fibers is 3 mm; the concentration of the suspension is 0.5 wt‰;

[0029] (2) Use a beater to beat the pulp, then add it to the suspension containing chopped fibers, and mix evenly to obtain a slurry suspension; the pulp is a mixture of aramid pulp and sulfonamide pulp Composition, the mass ratio of the two is 1:2; the concentration of the beating is 0.1%, and the beating time is 5 min; the mixing time of the suspension and the pulp is 0.5 h; the mass percentage of chopped fibers in the pulp suspension 60%;

[0030] (3) The slurry suspension is formed by a wet process on an inclined wire former to obtain an intermediate product of p...

Embodiment 3

[0032] Embodiment 3, a preparation method of an environment-friendly polyimide high temperature resistant insulating composite material: comprising the following steps:

[0033] (1) Disperse polyimide fibers in a fiber discrete device to obtain a suspension containing polyimide chopped fibers and dilute with water; the length of the chopped fibers is 10mm; the concentration of the suspension is 6wt ‰;

[0034] (2) Use a beater to beat the pulp, then add it to the suspension containing chopped fibers, and mix evenly to obtain a slurry suspension; the pulp is aramid pulp and polyimide pulp It is made by mixing, the mass ratio of the two is 2:1; the concentration of the beating is 0.8%, and the beating time is 100min; the mixing time of the suspension and pulp is 4h; the mass percentage of chopped fibers in the pulp suspension 95%.

[0035] (3) The slurry suspension is formed by a wet process on an inclined wire former to obtain an intermediate product of polyimide high tempera...

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Abstract

The invention relates to a preparation method of an environment-friendly polyimide high-temperature-resistant insulating composite material: dispersing polyimide fibers in fiber discrete equipment to obtain a suspension containing polyimide chopped fibers, and diluting with water ; Use a beater to beat the pulp, then add it to the suspension containing chopped fibers, and mix evenly to obtain a slurry suspension; use a wet process to form the slurry suspension in an inclined wire former to obtain polyamide An intermediate product of imide high-temperature-resistant insulating composite material; the intermediate product is subjected to hot-pressing treatment, and the finished product of polyimide high-temperature-resistant insulating composite material is obtained after cooling; the method of the present invention adopts inclined wire former forming in the product preparation process to realize low netting Concentration, the purpose of high product structure uniformity. No chemical additives are used in the preparation process, which can effectively reduce the production cost, reduce the difficulty of wastewater treatment and the pollution to the environment, and avoid the influence of the addition of chemical additives on the dielectric properties of the product.

Description

technical field [0001] The invention belongs to the cross technical field of insulating composite materials and papermaking industry, and in particular relates to a preparation method of an environment-friendly polyimide high temperature resistant insulating composite material. Background technique [0002] Polyimide fiber is a new high-performance fiber material with excellent high temperature stability, high voltage resistance, non-toxic, flame retardant and excellent insulation, etc. Indispensable high-performance materials in fields such as transportation, electrical insulation, and flame retardancy. Aramid fiber or sulfone fiber pulp inherits the excellent characteristics of high strength, high modulus and good temperature resistance of aramid fiber or sulfone fiber. Silk broom phenomenon, so it is easy to form hydrogen bonds with similar fibers, water and amide composite resins, improve the entanglement ability of pulp, and when combined with other fibers to prepare c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H15/10D21H13/26D21H13/20D21F11/02D21H27/12H01B3/52
CPCD21H15/10D21F11/02D21H13/20D21H13/26H01B3/52
Inventor 王士华李志强胡爱林龙柱郭帅李莎莎李广斌
Owner 连云港纤维新材料研究院有限公司
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