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A kind of polyimide fiber paper-based insulating material and preparation method thereof

A polyimide fiber, insulating material technology, applied in papermaking, papermaking, textiles and papermaking, etc., can solve the problems of poor thermal stability and low strength, and achieve good thermal stability, high mechanical properties, and high safety. Effect

Active Publication Date: 2021-10-22
JIANGSU AOSHEN HI TECH MATERIALS CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the prior art, polyimide fiber paper-based materials have problems such as poor thermal stability and low strength

Method used

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  • A kind of polyimide fiber paper-based insulating material and preparation method thereof
  • A kind of polyimide fiber paper-based insulating material and preparation method thereof
  • A kind of polyimide fiber paper-based insulating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] An unmodified SiC nano particle reinforced polyimide fiber paper-based insulating material and a preparation method thereof, comprising the following steps:

[0047] (1) soak 65wt% concentrated nitric acid solution for 3 hours to the PI fiber with a concentration of 6 mm in length, and take it out;

[0048] (2) Preparation of 2.0wt% unmodified original SiC nanoparticles impregnation mixed solution: 2g of unmodified original SiC nanoparticles and 100mL acetone were mixed and stirred for 3h, ultrasonically dispersed for 30min to obtain a pre-impregnated nanoparticle mixed solution, and then the step ( 1) After soaking the obtained PI fiber in the above dispersion liquid for 10s, take it out and dry it at 105°C for 4h;

[0049] (3) For the beating of aramid pulp, the beating degree is 55°SR, according to the quantitative 100g / m 2 The base paper prepared mixed slurry, adding mixed fiber is 90%, PI fiber: the mass ratio of aramid pulp is 1:1; Auxiliary CPAM, PEO, carboxylat...

Embodiment 2

[0053] A modified SiC nanoparticle reinforced polyimide fiber paper-based insulating material and a preparation method thereof, comprising the following steps:

[0054] (1) Amino functionalization of SiC nanoparticles: Dissolve 2g of SiC nanoparticles in 30mL of absolute ethanol, add 2g of 3-aminopropyltrimethylsilane and 4mL of deionized water, mix and stir at 80°C for 2h, Centrifuge, dry, and complete the amino modification treatment;

[0055] (2) soak 65wt% concentrated nitric acid solution for 3 hours to the PI fiber whose length is 6mm, and take it out;

[0056] (3) Preparation of 0.5wt% amino-modified SiC nanoparticles impregnating mixed solution: 0.5g of amino-functionalized modified SiC nanoparticles and 100mL of acetone were mixed and stirred for 3 hours, and ultrasonically dispersed for 30 minutes to obtain a pre-impregnated modified nanoparticles mixed solution; (2) Immerse the treated PI fiber in the modified nanoparticle mixture prepared above for 10 seconds, and...

Embodiment 3

[0061] A modified SiC nanoparticle reinforced polyimide fiber paper-based insulating material and a preparation method thereof, comprising the following steps:

[0062] (1) Amino functionalization of SiC nanoparticles: Dissolve 2g of SiC nanoparticles in 30mL of absolute ethanol, add 2g of 3-aminopropyltrimethylsilane and 4mL of deionized water, mix and stir at 80°C for 2h, Centrifuge, dry, and complete the amino modification treatment;

[0063] (2) soak 65wt% concentrated nitric acid solution for 3 hours to the PI fiber whose length is 6mm, and take it out;

[0064] (3) Preparation of 1.0wt% amino-modified SiC nanoparticles impregnation mixed solution: 1 g of amino-functionalized modified SiC nanoparticles and 100 mL of acetone were mixed and stirred for 3 h, and ultrasonically dispersed for 30 min to obtain a pre-impregnated modified nano-particle mixed solution; ( 2) The treated PI fiber was immersed in the modified nanoparticle mixture prepared above for 10 seconds, and d...

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Abstract

The invention discloses a polyimide fiber paper-based insulating material and a preparation method thereof, belonging to the technical field of paper-based composite materials. In the present invention, SiC nanoparticles are amino-functionalized, a simple impregnation method is used to introduce amino-functionalized SiC nanoparticles into the surface of PI fibers, and the method of wet forming and hot pressing in papermaking is used to prepare PI paper-based friction Materials, SiC nanoparticles form intermittent distribution of strong / weak bonds on the surface of the fiber, while improving the interfacial shear strength and fracture toughness between the fiber and the resin, the prepared modified SiC nanoparticles reinforced polyimide fiber paper base Friction material has the advantages of high mechanical performance, good electrical performance, controllable resistivity, good thermal stability, high safety, and light weight. It is an ideal material in insulating materials. At the same time, the process is simple and the production cost is low. It is suitable for industrialization Production.

Description

technical field [0001] The invention relates to a polyimide fiber paper-based insulating material and a preparation method thereof, belonging to the technical field of paper-based composite materials. Background technique [0002] Polyimide fiber (PI fiber) is a kind of polyimide resin or polyamic acid spinning slurry prepared by spinning. The molecular main chain contains aramid and other groups. The height of the main chain structure is Conjugation and aromaticity endow polyimide fibers with high strength, high modulus, high temperature resistance, corrosion resistance, and radiation resistance. It is a high-performance fiber product with excellent mechanical and electrical properties and has been widely used in New building materials, high-temperature filter materials, electrical insulation materials, heat-sealing materials and composite material reinforcements and other fields. [0003] In the traditional wet papermaking process, since the polyimide fiber will not be di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21F11/00D21H17/68
CPCD21F11/00D21H17/68
Inventor 王士华张国亮龙柱胡爱林李志强郭帅李广斌桑明珠
Owner JIANGSU AOSHEN HI TECH MATERIALS CO LTD
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