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Preparation method of modified polyacrylonitrile fiber paper-based rubber composite sealing material

A polyacrylonitrile fiber and composite sealing technology, which is applied in fiber raw material processing, non-fibrous pulp addition, inorganic fiber/sheet, etc., can solve the problems of uneven hydrophobic dispersion, unsatisfactory compression and rebound performance, etc., and achieve enhanced tensile strength intensity effect

Inactive Publication Date: 2019-03-15
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Highly branched polyacrylonitrile pulp fibers are used as the main fiber raw material of paper-based rubber sealing composite materials. Aiming at the problem that its hydrophobic dispersion is not uniform, resulting in unsatisfactory compression and rebound performance of the product, the present invention proposes a modified polypropylene Preparation method of nitrile fiber paper-based rubber composite sealing material, further improving product compression resilience and tensile strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The first step: in parts by mass, add 3 parts of polyacrylonitrile pulp fiber, 5 parts of NaOH, 7 parts of absolute ethanol, 35 parts of deionized water into a three-necked flask equipped with a reflux device, and stir evenly for 70 ℃ constant temperature water bath for 10 minutes, cooled, neutralized with acetic acid to pH 7, washed with deionized water and then dried at 105 ℃ to obtain modified polyacrylonitrile fibers for later use.

[0021] The second step: take 7% of the bleached softwood fiber relative to the mass percentage of the total dry fiber, 7% of the FKF mineral fiber relative to the mass percentage of the total dry fiber, and 6% of the total dry fiber. Aramid fibers, modified polyacrylonitrile fibers with a mass percentage of 15% relative to the total dry-dry fibers were then mixed for 9 minutes, and 10% talcum powder was added relative to the total dry-dry fibers. Expanded graphite with a mass percentage of 15% of the fiber, calcium carbonate with a mass...

Embodiment 2

[0024] The first step: in parts by mass, add 4 parts of polyacrylonitrile pulp fiber, 10 parts of NaOH, 8 parts of absolute ethanol, 40 parts of deionized water into a three-necked flask equipped with a reflux device, and stir evenly for 80 ℃ constant temperature water bath for 20 minutes, cooled, neutralized with acetic acid to pH 6, washed with deionized water and then dried at 105 ℃ to prepare modified polyacrylonitrile fibers for later use.

[0025] The second step: take 11% of the bleached softwood fiber relative to the mass percentage of the total dry fiber, 10% of the Lapinus mineral fiber relative to the mass percentage of the total dry fiber, and 8% of the total dry fiber. Aramid fibers, modified polyacrylonitrile fibers with a mass percentage of 20% relative to the total dry-dry fibers are then mixed for 11 minutes, and 15% talcum powder is added relative to the total dry-dry fibers. Expanded graphite with a mass percentage of 25% of the fiber, calcium carbonate with...

Embodiment 3

[0028] The first step: in parts by mass, add 5 parts of polyacrylonitrile pulp fiber, 15 parts of NaOH, 10 parts of absolute ethanol, 50 parts of deionized water into a three-necked flask equipped with a reflux device, and stir evenly for 90 ℃ constant temperature water bath for 30 minutes, cooled, neutralized with acetic acid to pH 7, washed with deionized water and then dried at 105 ℃ to obtain modified polyacrylonitrile fibers for later use.

[0029] The second step: take 13% of the bleached softwood fiber relative to the mass percentage of the total dry fiber, 7% of the Lapinus mineral fiber relative to the mass percentage of the total dry fiber, and 7% of the total dry fiber. FKF composite mineral fiber, aramid fiber with a mass percentage of 9% relative to the total absolute dry fiber, and modified polyacrylonitrile fiber with a mass percentage of 25% relative to the total absolute dry fiber are then mixed for 12 minutes and then added relative to the total absolute dry fib...

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Abstract

The invention relates to a preparation method of a high-performance modified polyacrylonitrile fiber paper-based rubber composite sealing material. The preparation method comprises the following steps: firstly uniformly stirring polyacrylonitrile pulp-like fiber with an NaOH solution and absolute ethyl alcohol, cooling after a thermostatic waterbath, neutralizing with acetic acid until the PH is 6to 7, washing with ionized water, and drying to obtain modified polyacrylonitrile fiber; then carrying out defibering on aramid fiber pulp, FKF compound mineral fiber, Lapinus mineral fiber, needlebush fiber and modified polyacrylonitrile fiber in water, then adding talcum powder, expanded graphite, calcium carbonate, aluminum sulfate, styrene-butadiene latex, butyronitrile latex, a sulfur ingredient, CPAM, bentonite and the like in sequence, sufficiently stirring for uniform dispersion, papermaking, and carrying out squeezing, drying and vulcanization to obtain the paper-based rubber composite sealing material. According to the preparation method, the interception adsorption capacity of tiny components such as fillers is increased, and the tensile strength and compressive resilience performances of the paper-based rubber composite sealing material are further improved.

Description

technical field [0001] The invention belongs to the intersecting field of the rubber industry and the papermaking industry, and relates to a preparation method of a modified polyacrylonitrile fiber paper-based rubber composite sealing material. Background technique [0002] Rubber sealing material is a composite material widely used in chemical industry, petroleum, automobile and industrial machinery and other fields. Asbestos fiber is the main fiber raw material for rubber sealing materials. In recent years, its use has been banned because of its multiple damages to the human body during its mining and use. Polyacrylonitrile pulp fiber is a new choice for making non-asbestos sealing materials. It is a kind of highly branched fiber. There are microfibers with loose feather-like tree structure on the surface of the main fiber. The long fibers can be used as skeleton fibers to improve Tensile strength, short fibers serve as functional fiber reinforcements and accommodate oth...

Claims

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Application Information

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IPC IPC(8): D21H13/18D21H13/26D21H13/36D21H17/66D21H17/67D21H17/68
CPCD21H13/18D21H13/26D21H13/36D21H17/66D21H17/67D21H17/675D21H17/68
Inventor 夏新兴潘娇静郭爱莲曹煜成黄善聪
Owner ZHEJIANG SCI-TECH UNIV
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