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2838results about "Carbon fibres" patented technology

Graphene modified carbon fiber emulsion sizing agent and preparation method thereof

The invention relates to a graphene modified carbon fiber emulsion sizing agent and a preparation method thereof. The conventional solvent sizing agent is not environment-friendly. The sizing agent is a mixed system consisting of organic resin, an emulsifying agent, a lubricating agent, graphene, an organic solvent and deionized water, wherein the emulsifying agent, the lubricating agent, the graphene and the organic solvent are respectively 2 to 14 percent, 0.5 to 2 percent, 0.05 to 1 percent and 30 to 200 percent based on the mass of the organic resin; and the solid content of the mixed system is 0.1 to 5 percent. The preparation method of the sizing agent comprises the following steps of: dissolving the organic resin in the organic solvent to form organic resin solution, adding the emulsifying agent, the lubricating agent and the deionized water into the organic resin solution, and stirring until the mixed system is subjected to phase transfer; adding the deionized water until the solid content is 30 to 50 percent to obtain organic resin emulsion; and adding the graphene into the organic resin emulsion, and adding the deionized water to dilute the mixed system until the solid content is 0.1 to 5 percent so as to obtain the graphene modified sizing agent. The method is simple and reliable, and the prepared graphene modified sizing agent can well protect carbon fibers and effectively improve the interface property of the carbon fibers and matrix resin.
Owner:NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI

Carbon fiber emulsion sizing agent improved by carbon nano tube and preparation method of carbon fiber emulsion sizing agent

InactiveCN102212967APlay the role of stress transmissionIncreased interlaminar shear strengthCarbon fibresEmulsionCarbon fibers
The invention relates to a carbon fiber emulsion sizing agent improved by a carbon nano tube and a preparation method of the carbon fiber emulsion sizing agent. The carbon fiber emulsion sizing agent comprises a carbon fiber sizing agent, the carbon nano tube, a dispersing agent and a solvent. The preparation method comprises the following steps of: 1, preparing the carbon fiber sizing agent; and 2, adding the carbon fiber sizing agent into the solvent to prepare a sizing working solution, mixing the carbon nano tube and the sizing working solution, performing ultrasonic treatment for 1 to 4 hours at the power of 300 to 600w, adding the dispersing agent, and performing ultrasonic dispersion for 2 to 4 hours to obtain the carbon fiber emulsion sizing agent improved by the carbon nano tube. The carbon fiber emulsion sizing agent has favorable stability, the post processability of carbon fiber can be improved after being processed by the emulsion sizing agent, the interfacial bond strength between the carbon fiber and substrate resin can be enhanced, the shear strength among layers is enhanced, and the performance of a composite material is improved to a certain extent. Moreover, the preparation method is simple, low in cost and environment-friendly.
Owner:DONGHUA UNIV

Self-emulsifying polyurethanes epoxy sizing agent for carbon fibers and preparation method thereof

The invention relates to a self-emulsifying polyurethanes epoxy sizing agent for carbon fibers and a preparation method thereof. The sizing agent comprises the following components in part by weight: 10 to 15 parts of self-emulsifying polyurethanes epoxy emulsion, 0.2 to 0.3 part of aid, and 84.7 to 89.8 parts of deionized water. The method for preparing the sizing agent comprises the following steps of: (1) preparing hydrophilic polyurethane prepolymer of the self-emulsifying polyurethanes epoxy emulsion; (2) preparing a prepolymer of which the end group is an epoxy group; (3) adding 6 to 20 parts of neutralizer into the prepolymer of which the end group is an epoxy group for neutralization, pouring the neutralized solution into water for dispersing, and removing the solvent through reduced pressure distillation to obtain the self-emulsifying polyurethanes epoxy emulsion; and (4) adding the aid and the deionized water into the polyurethanes epoxy emulsion in the ratio, and uniformly mixing to obtain the self-emulsifying polyurethanes epoxy sizing agent for the carbon fibers. The self-emulsifying polyurethanes epoxy sizing agent for the carbon fibers and the preparation method thereof have reasonable design. The sizing agent can improve the mechanical property of carbon fiber composite materials, and has excellent dilution stability.
Owner:天津碧海蓝天水性高分子材料有限公司

Method for modifying carbonized pre-oxidized fiber preform interface by carbon nanotube

The invention relates to a method for modifying a carbonized pre-oxidized fiber preform interface by a carbon nanotube. The method comprises the following steps: (1) performing carbonization at a set heating rate in a carbonizing furnace under the conditions of vacuum and six temperature sections (room temperature to 200 DEG C, 200 to 350 DEG C, 350 to 400 DEG C, 400 to 600 DEG C, 600 to 650 DEG C and 650 to 1,000 DEG C; (2) firstly removing colloid on the surface of carbon fiber at 600 to 800 DEG C, and then removing impurities on the surface of the fiber with the mixed acid of nitric acid and sulfuric acid; (3) firstly placing a processed carbon fiber punched preform into an organic solution of a catalyst precursor, and then growing the carbon nanotube in situ in a chemical vapor deposition furnace; (4) densifying the preform by a chemical vapor deposition process, and depositing the densified preform for 200 to 350 hours to ensure that the density of the preform reaches 1.70 to 1.75 g/cm3; and (5) placing materials in the vacuum carbonizing furnace, heating the materials until the temperature reaches 2,000 to 2,300 DEG C at the heating rate of 30-50 DEG C per hour under the protection of nitrogen, argon and the like, and keeping the temperature for 3 to 5 hours to obtain a finished product.
Owner:BEIHANG UNIV

Method for carbon fiber surface modification of plasma coated with nano colloidal sols by plasma treatment

The invention relates to a method for modifying the surface of carbon fiber coated with nano sol through plasma treatment, which comprises the following steps: firstly, nano particles are prepared into an organic solvent, a sol solution of water or a sol solution prepared by hybridization reaction of a precursor solution of organic-inorganic nano particles by the ultrasonic vibrating technology; secondly, the sol solution is coated on the surface of the carbon fiber, treated by means of spray coating and padding, and dried; and thirdly, the dried carbon fiber is placed on a special transport unit for plasma processing equipment and a plasma is sprayed on the surface of the carbon fiber to make the carbon fiber move in the plasma atmosphere, so as to generate surface modification, wherein the treating power is between 10 and , watts, and the treatment time is between 0.5 and 300 seconds. The method can effectively improve the performance of the fiber, improves the molded manufacturability and the overall properties of composite materials of the fiber, has simple technology, quick processing speed, good treatment effect and low cost, is convenient to operate and difficult to cause environmental pollution, can reduce energy consumption, and is suitable for industrial production.
Owner:DONGHUA UNIV +1
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