Preparation method of multipurpose self-emulsifying anionic unsaturated polyester carbon fiber sizing agent as well as product thereof, and application of product
A polyester carbon fiber, anionic technology, applied in fiber processing, textiles and papermaking, etc., can solve problems such as easy moisture absorption, carbon fiber hardening, poor interface bonding, etc.
Active Publication Date: 2021-04-20
吉林乾仁新材料有限公司
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Problems solved by technology
[0004] In order to solve the problem that the commercial epoxy resin type sizing agent is easy to absorb moisture after sizing on the surface of carbon fiber, resulting in the hardening of carbon fiber during storage, and at the same time to ensure that the epoxy resin type sizing agent can effectively strengthen vinyl ester after sizing on the surface of carbon fiber Resin matrix solves the problem of poor interfacial bonding of vinyl ester (VE) resin composites reinforced by carbon fiber (CF), and the purpose of the invention is to provide a preparation method for a multipurpose self-emulsifying anionic unsaturated polyester carbon fiber sizing agent
Method used
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[0041] 1. Synthesis of self-emulsifying unsaturated polyester sizing agent:
[0042] Following the principle of "similar and soluble", strong adhesion of fiber sizing resin was established, and four kinds of self-emulsifying anionic unsaturated polyester sizing agents with different double bond ratios were synthesized. The amounts of reactants are given in Table 1. AA is adipic acid, MA is maleic anhydride, NPG is neopentyl glycol, TBAB is tetrabutylammonium bromide, E-51 is epoxy resin (epoxy equivalent is 185g / mol, MTHPA is methyl tetrahydro Phthalic anhydride. Table 1. Lists the reactant charges for four sizing emulsions.
[0043] Table 1. Reactant feeding of four sizing agent emulsions
[0044]
[0045] The synthesis steps are as follows: AA, NPG and MA were added into a 500mL four-necked flask equipped with a mechanical stirrer, a thermometer and a reflux condenser. The mixture was heated to 200°C under nitrogen protection and dissolved with constant stirring until ...
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Abstract
The invention relates to a preparation method of a multipurpose self-emulsifying anionic unsaturated polyester carbon fiber sizing agent as well as a product thereof, and application of the product. According to the preparation method in the invention, unsaturated polyester which contains a carboxyl group in a side chain and has low glass-transition temperature is prepared by adopting a multi-step reaction, a salt-forming agent is added to neutralize the carboxyl group, and water is added to obtain the self-emulsifying anionic polyester carbon fiber sizing agent. The grafting reaction of the sizing agent on the surfaces of the carbon fibers and the cross-linking reaction among molecules of the sizing agent are optimized by adjusting the proportion of polyester double bonds of the sizing agent, so the bundling property and the fiber splitting property of the carbon fibers are regulated and controlled; meanwhile, the carboxyl group on a carbon fiber interface is increased after sizing, so glycidyl amine type epoxy resin is facilitated in formation of positive and negative charge effects on the carbon fiber interface and a cross-linking reaction with an epoxy resin matrix, and the interlayer shear strength of a composite material is improved; and in addition, the grafting reaction of the unsaturated polyester sizing agent on the carbon fiber interface and the self-crosslinking reaction degree of the unsaturated polyester sizing agent also influence the wettability and permeability of a vinyl ester resin matrix to sized carbon fibers and the interlayer shear strength of the composite material.
Description
[0001] Field [0002] The present invention relates to a preparation method of a multipurpose carbon fiber sizing agent and its product and application, in particular to a preparation method of a multipurpose self-emulsifying anionic unsaturated polyester carbon fiber sizing agent and its product and application. Background technique [0003] Carbon fiber reinforced resin composites (CFRP) have high specific strength and stiffness, specific modulus and reliable design, so they are widely used in aerospace, wind turbine blades, automotive lightweight and other fields. Patent US2013 / 0224470A1 reports that epoxy resin has excellent mechanical properties, low volume shrinkage during curing, generally less than 3%, and is widely used in the preparation of carbon fiber composite materials. Therefore, the epoxy resin carbon fiber sizing agent that matches the epoxy resin matrix has been obtained After extensive research, the market share in carbon fiber production is as high as 90%, ...
Claims
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Login to View More IPC IPC(8): C08G63/91C08G63/52D06M15/51C08L63/00C08K9/04C08K7/06
Inventor 杨春才王鑫
Owner 吉林乾仁新材料有限公司