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Method for testing density of polyacrylonitrile protofilament fibers

A technology with dense fibers and polyacrylonitrile, applied in the field of carbon fiber, can solve the problems of no standard rules and large errors, and achieve the effects of accurate and reliable results, strong comparability, and accurate and controllable testing process.

Inactive Publication Date: 2016-09-21
兰州蓝星纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no unified standard rule for this test method, and the error generated during the test process is also very large, so it can only be used as the result of parallel reference

Method used

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  • Method for testing density of polyacrylonitrile protofilament fibers
  • Method for testing density of polyacrylonitrile protofilament fibers
  • Method for testing density of polyacrylonitrile protofilament fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Weigh iodine, potassium iodide, acetic acid and 2,4-o-chlorophenol and dissolve them in 1L of high-purity water to prepare 0.2mol / L iodine solution. The molar ratio of iodine to potassium iodide, acetic acid and 2,4-o-chlorophenol is: 1:3 :7.5:0.3. Then the configured solution was transferred to a 2-liter beaker, and the iodine solution was heated to 60 degrees and stirred for 15 minutes. Weigh 8 different quality fiber bundles from the same batch, place them in a stainless steel cylinder in turn, immerse the cylinder in iodine solution, and stir gently for 50 minutes. Afterwards, the soaked fiber and the cylinder were taken out of the iodine solution, and the sample was sprayed and washed with desalted water at a flow rate of 0.5 L / min for 30 minutes until the water was colorless. Take out the cleaned fiber samples from the cylinder, put them into centrifuge tubes one by one, centrifuge at a speed of 4000 rpm for 40 minutes, and dry the washed samples by centrifugatio...

Embodiment 2

[0052]The preparation of iodine solution is as described in Example 1. Weigh 5 fiber samples of the same batch with a mass of 0.15 ± 0.01 g, put them in a stainless steel cylinder in turn, then soak them in iodine solution, and stir gently for 60 minutes. Afterwards, the soaked fiber and the cylinder were taken out of the iodine solution, and the sample was sprayed and washed with desalted water at a flow rate of 0.5 L / min for 50 minutes until the water was colorless. The fiber samples after washing are taken out from the cylinder, put into centrifuge tubes one by one, centrifuged at a speed of 4000 rpm for 60 minutes, and the washed samples are centrifuged to dry. Put the centrifuged fiber sample into a titration cup, add 80 ml of 50°C DMSO, and stir the sample on a magnetic stirrer until it is completely dissolved. With 0.1mol / L AgNO 3 The standard solution is subjected to potentiometric titration on an automatic titrator, the titration adopts linear titration, the titrati...

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Abstract

The invention discloses a method for testing the density of polyacrylonitrile precursor fibers. Including: (1) preparation of iodine solution; (2) weighing the fiber bundle in the range of 0.09-0.41 grams; (3) putting the weighed fiber sample into a cylinder with a partition, and immersing the cylinder into (4) washing and centrifugal drying; (5) adding 80-100 milliliters of DMSO, stirring the sample until completely dissolved; (6) carrying out potentiometric titration on an automatic titrator with 0.1mol / L AgNO standard solution, The titration adopts linear titration, the titration speed is customized mode, the titration rhythm is 0.01ml / s, the sample titration jumps linearly as a curve, the titration curve is derived, and the titration volume corresponding to the maximum derivative value is used as the titration end volume; (7 ) to calculate the iodine absorption percentage. The test process of the present invention is accurate and controllable, requires standardization, and the obtained parallel results are accurate, reliable and highly comparable.

Description

technical field [0001] The invention relates to the field of carbon fibers, and furthermore, relates to a method for testing the density of polyacrylonitrile precursor fibers. Background technique [0002] Carbon fiber is a new type of non-metallic material with a series of excellent properties such as high specific strength, high specific modulus, high temperature resistance, corrosion resistance, low thermal expansion, high electrical and thermal conductivity, self-lubrication, etc. It is widely used in aerospace, national defense and military And other cutting-edge fields, as well as civilian industrial fields such as advanced sporting goods and medical equipment. Carbon fiber is mainly obtained by high-temperature carbonization of polyacrylonitrile precursor, and the quality of carbon fiber depends to a large extent on the quality of polyacrylonitrile precursor. The density of the polyacrylonitrile precursor is an important content to evaluate the quality of the precurs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/42G01N1/28G01N1/30
CPCG01N27/42G01N1/28G01N1/30
Inventor 王斐严华张文佳张聪莉李雅东张丹丹
Owner 兰州蓝星纤维有限公司
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