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Method for improving carbonfiber surface activity

A technology of surface activity and carbon fiber, which is applied in fiber processing, textiles and papermaking, etc., can solve the problems of difficult control of oxidation degree, easy damage, fiber body strength, and harsh processing conditions

Active Publication Date: 2006-10-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxidation method can be gas-phase oxidation or liquid-phase oxidation, both of which can increase the oxygen-containing functional groups on the fiber surface, but the degree of oxidation is not easy to control, and it is easy to damage the bulk strength of the fiber; the plasma treatment method has a significant degree of activation on the fiber surface, However, the harsh treatment conditions are difficult to achieve industrialization; the electropolymerization method cannot ensure that the fiber surface is evenly coated with polymers, and the fibers are easy to stick together after treatment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0007] Specific embodiment one: present embodiment improves carbon fiber surface activity according to the following method:

[0008] 1. Using a mixture of acrylic acid and sulfuric acid as the grafting liquid, adding potassium permanganate and sulfuric acid to react to generate manganese dioxide triggers the grafting reaction between acrylic acid and carbon fiber. The specific operation method is: after mixing the solution of acrylic acid and sulfuric acid, put the carbon fiber to be modified, and ensure that the liquid completely immerses the carbon fiber. Then slowly add potassium permanganate solution, and keep the solution from changing color before and after adding to prevent excessive potassium permanganate. Put the container containing the carbon fiber and the reaction liquid at a temperature of 30-90° C. to carry out the grafting reaction, and the reaction time is about 2-6 hours.

[0009] Two: Take the reacted carbon fiber out of the solution, rinse it several times...

specific Embodiment approach 2

[0014] Specific embodiment two: Take 1000g of water and put it into a 2000mL beaker, weigh 100g of acrylic acid and put it into the beaker, then add 1g of concentrated sulfuric acid, mix well and put 50g of carbon fiber into it, so that the liquid will completely immerse the fiber, and place it for about 10min, weigh 0.8g of potassium permanganate and dissolve in 50g of deionized water, add the prepared potassium permanganate solution dropwise into the beaker, shake the beaker gently during the dropping process to make the dropwise potassium permanganate The rapid reaction keeps the solution in the beaker colorless and transparent. Put the beaker in an incubator to keep the temperature at 70°C for 3 hours, take out the beaker and pour out the reaction solution, rinse the fiber with deionized water for 3 times, then add deionized water and boil for 5 minutes. The fibers were taken out and dried in an oven at 105° C. for 1 hour. Compared with the untreated fibers, the oxygen co...

specific Embodiment approach 3

[0015] Specific implementation method three: take 70g of water and put it into a beaker, weigh 30g of acrylic acid and put it into the beaker, then add 1g of concentrated sulfuric acid, mix well and put 10g of carbon fiber into it, so that the liquid will completely immerse the fiber, and place it for about 10 minutes. Weigh 0.6g of potassium permanganate and dissolve it in 10g of deionized water, add the prepared potassium permanganate solution dropwise into the beaker, shake the beaker gently during the dropping process to make the dropped potassium permanganate react quickly Keep the solution in the beaker colorless and transparent. Put the beaker in the incubator to keep the temperature at 60°C for 3 hours, take out the beaker and pour out the reaction solution, rinse the fiber with deionized water for 3 times, then add deionized water and boil for 5 minutes. Take out the fiber and place it in an oven at 105° C. to dry for half an hour. Compared with the untreated fibers,...

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Abstract

The invention is a carbon fiber surface activity improving method, relating to a composite reinforcer surface modification technique, adopting potassium permanganate / vitriol as initiating system, grafting crylic acid on the surface of the carbon fiber, leading in active functional groups, and improving carbon fiber surface inertia, and concretely comprising the steps of: 1. adopting crylic acid-vitriol mixed solution as grafting liquid, adding in to-be-modified carbon fiber, and keeping the carbon fiber fully immersed in the liquid; then slowly adding in potassium permanganate solution, and before and after adding, keeping the solution not change color, and making graft reaction; 2. taking out the carbon fiber from the solution after reaction, repeatedly washing several times with deionized water, then adding to boiling water to boil and finally drying. And the invention is simple to operate, low-cost and has no environmental pollution, and is convenient to industrialization. As compared with the unactivated carbon fiber surface, the O / C ratio of the activated carbon fiber surface is increased by 10-32%, and the layer-to-layer shear strength of its epoxy composite is increased by 5-18%.

Description

technical field [0001] The invention relates to a surface modification technology of a composite material reinforcement, in particular to a method for improving the surface activity of carbon fibers by inducing grafting. Background technique [0002] As a high-performance fiber, carbon fiber has the advantages of high specific strength, high specific modulus, fatigue resistance, creep resistance and small expansion coefficient, making it the most important reinforcement material in recent years, and it is widely used in various fields of national economy. be widely used. When carbon fiber is used as a composite material reinforcement, due to its smooth surface, it is chemically inert, and has poor wettability with the resin matrix, resulting in poor interfacial adhesion, which seriously affects the overall excellent performance of the composite material. Therefore, improving the surface activity of carbon fibers has become one of the priority development directions for rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M14/36
Inventor 黄玉东徐志伟闵春英刘丽张春华刘立询
Owner HARBIN INST OF TECH
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