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Processing method for silane coupling agent modified carbon fiber surface

A silane coupling agent and fiber surface technology, which is applied in fiber treatment, ultrasonic/sonic fiber treatment, carbon fiber, etc., can solve the problems of limited modification effect and fiber body damage by a single method, achieve remarkable treatment effect, and improve interface adhesion. Effect of improved junction, mechanical and thermal properties

Active Publication Date: 2014-03-19
山西泰宝科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, a single method of modification has its limitations. While improving the surface activity of the fiber, it will also cause varying degrees of damage to the fiber body, and the effect of a single method of modification is limited, and it has not been widely used in industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Example 1: Take 5g of Toray T300 carbon fiber with a length of 1mm, ultrasonically oscillate in acetone for 1 hour to remove the surface sizing agent, and dry to obtain CF-1. Disperse CF-1 in 100ml of nitric acid with a mass concentration of 30%, 90 o C was refluxed for 1 hour, washed with water until the pH was 6 after natural cooling, and dried to obtain CF-2. Disperse CF-2 in 100ml tetrahydrofuran, add 1g lithium aluminum hydride, 25 o C was stirred for 1 hour, then 100ml of 2.5mol / L hydrochloric acid was added, mechanically stirred for 1 hour, the fibers were filtered out, soaked and washed in tetrahydrofuran for 12 hours, and dried to obtain CF-3. Take 50g of methanol and 10g of deionized water, then add 0.3g of silane coupling agent KH550, stir and mix well to obtain a silane coupling agent solution. Disperse CF-3 in it, stir with a glass rod for 10 minutes, filter out the fibers, and o C oven dried for 24h to obtain CF-4. The tensile strength of carbon fiber ...

example 2

[0027] Example 2: Take 5g of Toray T300 carbon fiber with a length of 1mm and put it in acetone at 80 o C Soxhlet extraction for 24 hours to remove the surface sizing agent, and drying to obtain CF-1. Disperse CF-1 in 200ml of 68wt% nitric acid, soak for 24 hours, wash with water until the pH is 7, and dry to obtain CF-2. Disperse CF-2 in 200ml tetrahydrofuran, add 1.5g lithium aluminum hydride, 40 o C stirred for 2 hours, then added 150ml of 1.5mol / L hydrochloric acid, stirred for 2 hours, filtered out the fibers, soaked and washed in tetrahydrofuran for 24 hours, and dried to obtain CF-3. Take 70g of methanol and 10g of deionized water, then add 0.8g of silane coupling agent KH5501, stir and mix well to obtain a silane coupling agent solution. Disperse CF-3 in it, sonicate for 1h, filter out the fibers, at 100 o C oven dried for 24h to obtain CF-4. After composite modification, the single filament tensile strength of carbon fiber can reach 3.86GPa, and the interfacial sh...

example 3

[0028] Example 3: Take 5g of Toray T300 carbon fiber with a length of 3mm, ultrasonically oscillate in acetone for 1.5h, remove the surface sizing agent, and dry to obtain CF-1. CF-1 is dispersed in the nitric acid of 200ml 68wt%, 90 o C for reflux oxidation for 30 minutes, washed with water to pH 6.8 after natural cooling, and dried to obtain CF-2. Disperse CF-2 in 300ml tetrahydrofuran, add 2g lithium aluminum hydride, 60 o C was stirred for 2 hours, then 200 mL of 1.5 mol / L hydrochloric acid was added, stirred for 2 hours, the fibers were filtered out, soaked and washed in tetrahydrofuran for 12 hours, and dried to obtain CF-3. Take 90g of methanol and 10g of deionized water, then add 1.5g of silane coupling agent KH560, stir and mix well to obtain a silane coupling agent solution. Disperse CF-3 in it, stir with a glass rod for 1h, filter out the fibers, and o C oven dried for 24h to obtain CF-4. After composite treatment, the tensile strength of carbon fiber monofilame...

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Abstract

A processing method for silane coupling agent modified carbon fiber surface comprises the following steps: removing the sizing agent coated on the sizing carbon fiber surface by using acetone, drying, then carrying out oxidation etching on the fiber surface by using concentrated nitric acid, water-washing until the pH reaches 6 to 8, drying, then dispersing the fiber into tetrahydrofuran, adding lithium aluminium hydride to reduce the oxygen containing groups on the fiber surface and convert all the oxygen containing groups into hydroxyl groups, then adding hydrochloric acid, stirring for 1 to 2 hours, filtering so as to obtain carbon fibers, soaking and washing the carbon fibers with tetrahydrofuran, drying, then dispersing the carbon fiber into a silane coupling agent hydrolysate, stirring or subjecting the carbon fiber to an ultrasonic treatment, filtering so as to obtain the carbon fiber, and drying the carbon fiber. The method improves the surface activity of the carbon fiber, does not harm the fiber body, and is capable of being applied to mass production.

Description

technical field [0001] The invention relates to a method for modifying the surface of carbon fibers, in particular to a method for treating the surface of carbon fibers modified by a silane coupling agent. Background technique [0002] Carbon fiber is a new generation of reinforcing fiber with the two characteristics of high tensile strength of carbon material and soft processability of fiber. It has both the electrical conductivity and thermal conductivity of metal materials, and the heat resistance and chemical resistance of ceramic materials. There are many advantages such as flexibility, softness and weaving of textile fibers. Its specific gravity is only 1 / 4 of steel, but its tensile strength can reach 7 to 9 times that of steel. Therefore, it has been widely used in many fields such as aerospace, automobile manufacturing, sports and leisure, and high-performance carbon fiber has become a new technology at home and abroad. Emphasis and hotspots of research in the field...

Claims

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Application Information

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IPC IPC(8): D06M13/513D06M13/50D06M11/64D06M11/01D06M10/02C08K9/06C08K7/06C08K3/04C08L63/00C08L75/04D06M101/40
Inventor 李其峰亢茂青姜帅王军威赵雨花
Owner 山西泰宝科技有限公司
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