The invention provides an epoxy resin composition for prepreg. The epoxy resin composition comprises epoxy resins, modified epoxy resins and a curing agent; liquid rubber comprises one kind or several kinds of carboxyl nitrile liquid rubber, hydroxy-terminated copolybutadiene butyronitrile liquid rubber, hydroxy-terminated copolybutadiene polybutadiene liquid rubber, carboxyl terminated polybutadieneliquid rubber, hydroxyterminated copolybutadiene polyisoprene liquid rubber, carboxyl terminated polyisoprene liquid rubber, polyurethane modified liquid rubber, liquid silicon rubber and liquid polysulfide rubber. The liquid rubber is used for modifying an epoxy resin basal body, so that the binding force between a system for using epoxy resins as basal bodies, and a carbon fiber material interface is improved, and the mechanical property of the fibers is further improved. The invention further provides carbon fiber prepreg and a carbon fiber compound material. The stretching strength of the carbon fiber compound material provided by the invention at 0 degree (or in the radial direction) is 2.4GPa, the bending strength is 1320MPa, and the plane cutting strength is 70.3MPa.

Epoxy resin composition for prepreg, carbon fiber prepreg and carbon fiber compound material

The invention provides a resin composition which consists of the following components in parts by weight: (A) 25-35 parts of phenoxy resin, (B) 15-15 parts of polyurethane modified epoxy resin, (C) 10-15 parts of biphenyl epoxy resin, (D) 6-10 parts of a high-flexibility amine curing agent, (E) 7-12 parts of nitrogen-containing phenolic resin, (F) 0.001-0.003 part of an imidazole curing accelerant, (G) 10-15 parts of a phosphorus-containing fire retardant, (H) 5-20 parts of inorganic filler, and (I) a solvent for dissolving rest components, and the solid content of the resin composition is regulated to 30-50%. The covering film prepared from the resin composition is halogen-free and flame-retardant, and is excellent in adhesion, heat resistance, aging resistance and ion migration resistance, good in softness and relatively long in shelf life; and the covering film can meet the requirements of a high-reliability flexible printed circuit board.

Resin composition and covering film prepared from resin composition

The invention discloses a manufacturing method of an insulating light-weight high-property fishing rod, and relates to the technical field of fishing rod production. The manufacturing method comprises the following steps of: firstly preparing high-molecular thermosetting epoxy resin by using bisphenol A epoxy resin, dicyandiamide and an accelerant, and then mixing with an insulating complex fiber and a solidified cross-linking agent to prepare a high-molecular epoxy resin composite material; then impregnating a special glass fiber cloth or carbon fiber cloth for the fishing rod into a glue solution of the high-molecular epoxy resin composite material for pre-impregnation; finally manufacturing the fishing rod through cloth cutting, pipe coiling, tape fastening, heating solidification, demoulding, polishing, coating and assembly. The manufacturing method disclosed by the invention can be used for enhancing the appearance quality, corrosion resistance, combustion resistance, high temperature resistance and electrical insulation of the fishing rod and really solving the problem of safety of the fishing rod by adopting the high-molecular thermosetting epoxy resin as base resin and using different novel insulating complex fibers for different positions of the fishing rod.

Manufacturing method of insulating light-weight high-property fishing rod

The invention discloses a preparation method of a composite polyurethane film. The preparation method comprises the following steps: (1) mixing isocyanate, polyol, and auxiliary materials together to carry out reactions so as to form a polyurethane system; (2) evenly spraying or painting the obtained polyurethane system on a separation layer; (3) laminating a substrate layer on the polyurethane system, wherein the pressing force is controlled in a range of 0 to 10 kgf/cm, and the pressing time is controlled within 30 seconds; (4) curing the polyurethane system at a low temperature to form a polyurethane layer; (5) peeling off the separation layer after cooling so as to obtain the composite polyurethane film composed of a polyurethane layer and a substrate layer finally. The preparation method has the advantages of simple operation, low cost, and high production efficiency. The prepared film has the advantages of diverse and decorative surface, and user-friendliness. Moreover, the polyurethane layer is not easy to separate, and the adhesion is firm.

Preparation method of composite polyurethane film

The invention relates to a flexible epoxy resin and a preparation method thereof, belonging to the technical field of high polymer materials. The preparation method specifically comprises the following steps: by taking dicarboxylic acid, fatty alcohol diglycidyl ether and a bisphenol A epoxy resin as raw materials, carrying out a polymerization reaction, and introducing flexible chain segments of the fatty acid and fatty alcohol glycidyl ether into a molecular main chain of the bisphenol A epoxy resin with high rigidity due to high aromatic ring density, wherein the epoxy resin is endowed with flexibility. The composition and amount of the raw materials of the polymerization reaction are adjusted, so that series epoxy resin products with different flexibilities can be obtained, and the flexible epoxy resins can be singly used, also can be matched with the bisphenol A epoxy resin, are finally converted into cured products with three-dimensional network structures under the actions of proper curing agents and curing accelerators, refer to flexible materials with high elongation at break and can serve as flexible materials needing to bear high strain and resist stress cracking, such as high-elasticity adhesives and flexible packaging materials.

Flexible epoxy resin and preparation method thereof

The invention provides a method for improving interlaminar shear strength of medium/low-temperature cured prepreg by using polyurethane prepolymer. The method comprises the following steps: firstly, reacting isocyanate with polyether polyol according to a controllable ratio to obtain a terminal isocyanate polyurethane prepolymer; grafting the terminal isocyanate polyurethane prepolymer to a bisphenol type epoxy resin, and adding a mixed epoxy resin to obtain a modified epoxy resin matrix; uniformly mixing the modified epoxy resin matrix with a curing agent and an accelerant to obtain a resin system for prepreg; and finally, preparing the resin system into a rubber film, compounding the rubber film with reinforced fibers or fabrics so as to prepare the medium/low-temperature cured prepreg with excellent adhesiveness. The prepreg preparation process is reasonable, the bonding strength of the resin system and fiber is high, the interlaminar shear strength of the composite material is obvious improved, and the method is particularly suitable for low-temperature cured prepreg.

Method for improving interlaminar shear strength of medium/low-temperature cured prepreg by using polyurethane prepolymer

The invention provides a preparation method of a dimer acid modified epoxy resin toughened carbon fiber prepreg, which comprises the following steps: by taking a component of which the molecular structure is similar to that of a carbon fiber sizing agent as toughener, preparing a dimer acid modified epoxy resin through a pre-reaction method; adding reactants into the mixed epoxy resin, adding a latent curing agent, and evenly mixing to obtain a resin system for the prepreg; and coating the resin system through a film coating machine, and then compounding with carbon fibers or a fabric made therefrom to prepare the moderate-temperature curing prepreg having fine operability and adhesivity. Compared with the traditional rubber toughened prepreg, the invention can enhance the wettability of the resin system on carbon fibers, reduce the moisture permeability of the prepreg and simultaneously improve the toughness and impact resistance of the composite material, thus being suitable for manufacturing of a prepreg for winding formation.

Preparation method of dimer acid modified epoxy resin toughened carbon fiber prepreg

The invention provides a method for preparing epoxy resin prepreg capable of being cured at normal temperature. The method comprises the following steps: coating a matrix epoxy resin on release paper to prepare a resin rubber film; compounding the resin rubber film with reinforced fibers or fabrics, fully infiltrating the fibers or fabrics through the matrix epoxy resin under a certain temperature and pressure to obtain a prepreg blank; coating a curing agent on the release paper to obtain the curing agent rubber film; and compounding the prepreg blank and the curing agent rubber film at low temperature to obtain the prepreg capable of being cured at normal temperature. The prepreg preparation process is reasonable, the problems in the low-temperature prepreg preparation process are effectively solved, and the method contributes to popularization and application of low-temperature cured prepreg.

Method for preparing epoxy resin prepreg capable of being cured at normal temperature

The invention provides a preparation method of an adhesive assorted with a liquid crystal coated optical cable. In the preparation method of the adhesive assorted with the liquid crystal coated optical cable, alpha, omega-terminal hydroxyl polymethyl vinylphenyl silicone rubber or alpha, omega-terminal hydroxyl polydimethyl diethyl siloxane with good low temperature performance is taken as a main material, nano-filler-reinforced silicone rubber adhesive is used for improving mechanical properties thereof, and according to a vulcanization mechanism of a dealcoholized room temperature vulcanization silicone rubber, room temperature vulcanization silicone rubber adhesive with excellent low temperature performance and moderate releasing force is prepared. When the adhesive is used for winding an optical cable coil, releasing forces at normal temperature and low temperature are moderate and wires can be smoothly unwound, thus meeting requirements of practical application and particularly meeting a requirement on the releasing force in a low temperature environment.

Preparation method of adhesive assorted with liquid crystal coated optical cable

The invention belongs to the field of composite material, and specifically discloses a latent curing system used for moulding prepregs at a medium or low temperature and a method for preparing the latent curing system The latent curing system comprises 10-50 parts of epoxy resin, 50-100 parts of a latent curing agent, 40-80 parts of a liquid room-temperature reactive curing agent, and 1-10 parts of an accelerant The preparation method comprises the following steps: uniformly mixing the latent curing agent and the liquid room-temperature reactive curing agent; adding epoxy resin and the accelerant to carry out a reaction at the temperature of 60 to 100 DEG C for 2-6 hours; and finally obtaining a paste liquid that is the latent curing system used for moulding prepregs at a medium or low temperature According to the invention, the latent curing system is used for moulding at a medium or low temperature, the curing temperature of the latent curing agent is reduced, and the pasty form is beneficial to uniformly dispersing the latent curing system in the epoxy The latent curing system is simple in operation of preparation technology and is suitable for large-scale industrial production

Latent curing system used for moulding prepregs at medium or low temperature and method for preparing latent curing system

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