Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Industrial method for preparing polyimide fiber insulation paper in inclined-wire forming method

A polyimide fiber, polyimide technology, applied in synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, papermaking, etc., can solve the impact of product dielectric properties, environmental pollution, low Internet access Concentration and other issues to achieve the effect of improving the uniformity of the tissue structure, broadening the selection range, and reducing the difficulty of processing

Inactive Publication Date: 2017-09-29
连云港纤维新材料研究院有限公司 +1
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome the problems that the low slurry concentration in the preparation process of polyimide fiber paper affects the molding of composite materials and the addition of chemical additives affects environmental pollution and product dielectric properties, and provides a method for preparing polyimide fiber paper. The new method of insulating paper 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1, an industrial method for preparing polyimide fiber insulating paper by inclined wire forming method:

[0027] (1) Disperse polyimide chopped fibers in a dispersion tank to obtain a suspension containing chopped fibers, and dilute with water; the conductivity of the dilution water is 3us / cm; the length of the chopped fibers is 3 mm; The stirring time is 0.5 h; add water to dilute to a polyimide fiber suspension concentration of 0.5 wt‰;

[0028] (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, arylsulfone pulp or One or more of polyimide pulp; the beating concentration is 0.1%, and the beating time is 5 min; the chopped fiber accounts for 60% of the mass percentage of the slurry suspension; the pulp is aramid pulp One of sulfonamide pulp or polyimide pulp;

[0029] (3) Polyimide base paper is obtained by using the inclined wire forming process fo...

Embodiment 2

[0031] Example 2, an industrial method for preparing polyimide fiber insulating paper by inclined wire forming method:

[0032] (1) Disperse polyimide chopped fibers in a dispersion tank to obtain a suspension containing chopped fibers, which is diluted with water; the conductivity of the dilution water is 10us / cm; the length of the chopped fibers is 10mm; when dispersed The stirring time is 5h; add water to dilute to the polyimide fiber suspension concentration is 6wt‰;

[0033] (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, arylsulfone pulp or One or more of polyimide pulp; the concentration of beating is 0.8%, and the beating time is 100min; the chopped fiber accounts for 95% of the mass percentage of the slurry suspension; the pulp is selected from aramid pulp It is a mixture of sulfonamide pulp and sulfonamide pulp at a ratio of 1:1.

[0034] (3) Polyimide...

Embodiment 3

[0036] Example 3, an industrial method for preparing polyimide fiber insulating paper by inclined wire forming method:

[0037] (1) Disperse polyimide chopped fibers in a dispersion tank to obtain a suspension containing chopped fibers, which is diluted with water; the conductivity of the dilution water is 6us / cm; the length of the chopped fibers is 7mm; when dispersed The stirring time is 1h; add water to dilute to a polyimide fiber suspension concentration of 3wt‰;

[0038](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, arylsulfone pulp or One or more kinds of polyimide pulp; the mixing time of chopped fiber and pulp is 2h to obtain slurry suspension; the concentration of beating is 0.3%, and the beating time is 20min; The liquid mass percentage is 75%; the pulp is selected from a mixture of aramid pulp and polyimide pulp in a ratio of 1:2;

[0039] (3) Polyim...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
lengthaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses an industrial method for preparing polyimide fiber insulation paper in an inclined-wire forming method. The industrial method comprises the following steps: dispersing polyimide chopped fibers in a dispersing tank to obtain suspension containing the chopped fibers, diluting with water until the concentration of the polyimide chopped fiber suspension is 0.5 to 6 thousandth by weight; pulping pulp by adopting a pulping machine, then adding into the suspension containing the chopped fibers, and uniformly mixing to obtain pulp suspension, wherein the pulp is one or more of aramid pulp, polysulfonamide pulp and polyimide pulp; forming polyimide body paper from the pulp suspension by adopting an inclined-wire forming process; and thermally pressing the body paper, and cooling to obtain a polyimide paper finished product. By adopting the inclined-wire forming process, a purpose of long-fiber papermaking under lower concentration is realized. No chemical additive is added in the preparation process, the production cost can be effectively decreased, the waste water treatment difficulty and the environmental pollution are alleviated, the influence of the chemical additive on dielectric properties of the product can be avoided, and the selection range of the high-temperature-resistant insulation composite material industry can be increased.

Description

technical field [0001] The invention belongs to the interdisciplinary technical field of papermaking industry and material industry, and in particular relates to an industrialized method for preparing polyimide fiber insulating paper by inclined wire forming. Background technique [0002] As an important variety of high-performance fibers, polyimide fibers have superior insulation properties, high temperature resistance, good mechanical properties, chemical corrosion resistance, thermal oxidation stability and radiation resistance, etc. Compared with traditional insulating materials, the high-temperature-resistant insulating composite material prepared from polyimide fiber has better high-temperature resistance, high strength, and high insulation. It is mainly used in the fields of electrical insulation and honeycomb structure reinforcement, including Power generation equipment, power transmission and transformation equipment, motors, aerospace, rail transit, traction locomo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26D21H15/02D21H15/10D21F11/02
CPCD21H13/26D21F11/02D21H15/02D21H15/10
Inventor 王士华胡爱林龙柱李志强郭帅李莎莎李广斌
Owner 连云港纤维新材料研究院有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com