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Sample preparation method for testing tensile property of asphalt-based carbon fiber multifilament

A technology of pitch-based carbon fiber and tensile properties, which is applied in the preparation, sampling, and measuring devices of test samples, can solve the problems of large dispersion and low tensile strength test values, and achieves improved accuracy and improved manufacturing. Sample efficiency and ensure full effect

Active Publication Date: 2018-07-24
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a sample preparation method for the tensile performance test of pitch-based carbon fiber multifilament, which can effectively solve the tensile strength test caused by fiber damage in the process of pitch-based carbon fiber multifilament tensile test Low value, large dispersion and other technical problems, the prepared tensile spline has a smooth appearance and stable tensile test results, and is suitable for a variety of pitch-based carbon fibers

Method used

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  • Sample preparation method for testing tensile property of asphalt-based carbon fiber multifilament
  • Sample preparation method for testing tensile property of asphalt-based carbon fiber multifilament

Examples

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Effect test

Embodiment 1

[0038] Use 5N tension to wind the XN-90 pitch-based carbon fiber multifilament of 6K specifications on the iron frame, and fix the bending part of the multifilament on the frame with adhesive tape; add 100 parts by mass of 1, Diglycidyl 2-epoxycyclohexane 4,5-dicarboxylate, 60 parts by mass of hexahydrophthalic anhydride and 0.5 parts by mass of N,N dimethylaniline, then add 120 parts of acetone and stir for 5 minutes to obtain the resin Glue solution: Use a dropper to inhale epoxy resin glue solution and drop glue solution from the upper end of the frame along the fiber multifilament bundle. Dry and solidify in a blast oven. The curing process conditions are (80°C / 1h)+(140°C / 2h)+(200°C / 3h). After cooling, the multifilaments are cut, and paper reinforcement sheets are pasted to obtain tensile samples. The tensile properties of pitch-based carbon fiber multifilament are shown in Table 1.

Embodiment 2

[0040] Use 1N tension to wind the P-120 pitch-based carbon fiber multifilament of 2K specifications on the iron frame, and fix the bending part of the multifilament on the frame with adhesive tape; add 100 parts by mass of 4, 4'-Diaminodiphenylmethane, 100 parts by mass of methylhexahydrophthalic anhydride and 1.5 parts by mass of diethylaminopropylamine, then add 100 parts by mass of toluene and stir for 5 minutes to obtain a resin glue; use a dropper to inhale the epoxy resin The glue solution is slowly dripped from the upper end of the frame along the fiber multifilament bundle, the dropping rate is 4mL / min, and the dropping time is 1 minute / segment; the dipped multifilament frame is dried and cured in a blast oven, and the curing process conditions (140°C / 1h)+(200°C / 1h), cut the multifilament after cooling, paste the paper reinforcing sheet to obtain the tensile sample. The tensile properties of pitch-based carbon fiber multifilament are shown in Table 1.

Embodiment 3

[0042] Wrap 2K specifications of K13D pitch-based carbon fiber multifilament on an iron frame with 1N tension, and fix the bending part of the multifilament on the frame with adhesive tape; add 100 parts by mass of 4,4' to a 500mL measuring cup in sequence -diaminodiphenylmethane, 80 parts by mass of methyltetrahydrophthalic anhydride and 3 parts by mass of 2-ethyl-4-methylimidazole, then add 60 parts of xylene and fully stir for 5 minutes to obtain the resin glue; The pipe sucks the epoxy resin glue solution from the upper end of the frame and slowly drops the glue solution along the fiber multifilament bundle. The glue dropping rate is 3mL / min, and the glue dropping time is 2 minutes / segment; Dry and solidify in an oven. The curing process conditions are (80°C / 1h)+(140°C / 1h)+(200°C / 2h). After cooling, the multifilaments are cut and pasted with a paper reinforcement sheet to obtain a tensile sample. The tensile properties of pitch-based carbon fiber multifilament are shown in...

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Abstract

The invention relates to a sample preparation method for testing the tensile property of an asphalt-based carbon fiber multifilament, and belongs to the technical field of material property testing. The method comprises the following steps: applying tension to wind a carbon fiber multifilament on a frame, and fixing the bent part of the multifilament on the frame with a fixing material; placing the frame with wound multifilament vertically along the extension direction of the multifilament, dripping a glue solution from the upper end of the frame to ensure that the dripped glue solution flowsfrom the upper end of the multifilament to the lower end along the multifilament until the multifilament is completely soaked to obtain a glue dipped multifilament frame; and curing the glue dipped multifilament frame, cutting the multifilament, and pasting a paper reinforcing sheet to obtain a tensile sample. According to the method provided by the invention, fiber damages in the operation process are avoided, the sample preparation efficiency is improved, the problem of fiber monofilament brittle fracture caused by the surface tension of the glue solution and the gravities of the glue solution and the multifilament is also avoided, the maximum developed strength of the multifilament is ensured, the accuracy of the tensile strength test value is greatly improved, and the tensile strengthdispersion coefficient is reduced.

Description

technical field [0001] The invention belongs to the technical field of material performance testing, and in particular relates to a sample preparation method for testing the tensile performance of pitch-based carbon fiber multifilaments. Background technique [0002] Mesophase pitch-based carbon fiber is a kind of high-performance carbon fiber. Due to its highly oriented molecular structure, it shows superiority in modulus and thermal conductivity. Mesophase pitch-based carbon fiber is generally made of coal tar pitch, petroleum pitch or other pitches. , prepared from an optically anisotropic mesophase pitch. In 1975, Union Carbide Corporation of the United States announced the method of manufacturing high modulus carbon fiber "Thornel P" with mesophase pitch, and it was put into commercial production soon. Since then, pitch-based carbon fiber has entered the fast lane of development and has become the second largest raw material route to produce carbon fiber after polyacry...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/30G01N1/36G01N1/44
CPCG01N1/286G01N1/30G01N1/36G01N1/44G01N2001/364
Inventor 朱世鹏杨云华冯志海潘月秀高建丽张灏李龙
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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