A carbon fiber surface grafting method based on supercritical fluid technology
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A supercritical fluid and surface grafting technology, applied in the production of bulk chemicals, etc., can solve the problems of easy crosslinking of grafted polymers, low bonding strength between carbon fiber and resin, and few reaction sites, so as to improve the interface structure, Improve interface performance, time-consuming effect
Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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[0006] The present invention aims to solve the problems that the existing carbon fiber surface modification method has few reaction sites for grafted small molecules, easy cross-linking of grafted polymers, and low bonding strength between modified carbon fiber and resin, and provides a A carbon fiber surface grafting method based on supercritical fluid technology
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specific Embodiment approach 1
[0028] Specific embodiment one: this embodiment is based on the carbon fiber surface grafting method of supercritical fluid technology, and carries out according to the following steps:
[0029] 1. Removal of epoxy coating on carbon fiber surface:
[0030] Put the carbon fiber bundle into a Soxhlet extractor, use acetone as a solvent, heat the acetone to 75-85°C, and maintain at this temperature for 40-50h; then take out the carbon fiber and dry it;
[0031] 2. Oxidation of carbon fiber:
[0032] A. Configure a mixed solution of 30-50mL potassium persulfate and silver nitrate at normal temperature;
[0033] B. Put 0.1-0.3g of carbon fiber bundles treated in step 1 into a mixed solution of potassium persulfate and silver nitrate, heat to 60-80°C, and place at a constant temperature for 1-2h;
[0034] C. Then take the carbon fiber out of the mixed solution, soak it in 300-500mL distilled water for 5-10min, repeat this step 3-5 times;
[0035] D. Take out the carbon fibers tre...
specific Embodiment approach 2
[0043] Embodiment 2: This embodiment differs from Embodiment 1 in that: the drying described in Step 1 is to dry in an oven at 70-80° C. for 2-4 hours. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0044]Specific embodiment three: what this embodiment is different from specific embodiment one or two is: the concentration of potassium persulfate in the mixed solution of potassium persulfate and silver nitrate described in step 2 is 0.1-0.2mol / L, the concentration of silver nitrate 0.001-0.005mol / L. Others are the same as in the first or second embodiment.
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Abstract
The invention discloses a supercritical fluid technology-based carbon fiber surface grafting method, and relates to a carbon fiber surface modifying method. The purpose of the invention is to solve the problems of few reaction sites of grafted micro-molecular substances, easy cross-linking of graft copolymers, and low bonding strength between modified carbon fibers and resin of present carbon fiber surface modifying methods. The method disclosed in the invention comprises the following steps: removing an epoxy coating layer on the surface of the carbon fibers; 2, oxidizing the carbon fibers; 3, carrying out acylchlorination on the carbon fibers; and 4, grafting the surface of the carbon fibers with melamine. The surface of the carbon fibers is grafted with melamine, and the quantity of reaction sites is large, so convenience is provided for a next step grafting reaction. The molecular weight of melamine is small, and melamine and polymers are difficult to cross-link, so melamine has very good dispersion, and undergoes a grafting reaction with good homogeneity on the surface of the carbon fibers in order to facilitate improvement of the interface performances of a composite material. The method is used for surface modification of the carbon fibers.
Description
technical field [0001] The invention relates to a carbon fiber surface modification method. Background technique [0002] The graphite crystallite size on the surface of carbon fiber (CF) without surface treatment is large, the number of active carbon atoms at the edge is small, and the surface lacks enough polar functional groups to participate in the interface, resulting in poor bonding with the resin matrix. For surface-treated carbon fibers, the interface layer can effectively transfer loads, give full play to the characteristics of high strength and high modulus of reinforced fibers, and the strength utilization rate reaches 80-90%. In contrast, the strength utilization rate of carbon fibers without surface treatment It is only 55-60%, and the modification of the carbon fiber surface is thus born. [0003] The surface properties of carbon fibers mainly depend on their physical characteristics such as surface micromorphology, specific surface area, and surface roughness...
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