One-way continuous fiber-reinforced resin-based composite prepreg and preparation method thereof

Abstract

The invention discloses one-way continuous fiber-reinforced resin-based composite prepreg and a preparation method thereof and belongs to the technical field of resin-based composites. Particularly, a solvent is used for preparing a saturated solution containing soluble resin or one or more of active monomers of the soluble resin, a curing agent, a catalyst and a prepolymer, powder of another resin or filler is added, and a suspension with part of soluble components evenly formed on the surface of the powder is formed through a phase inversion method for dipping; fiber bundles are arranged after being dipped, rolling is carried out after the solvent is evaporated to dryness, and the prepreg is obtained. The prepreg has good laying performance and can be formed at low pressure, and low porosity is obtained. A first component is soluble resin or one or more of the active monomers of the soluble resin, the curing agent, the catalyst and the prepolymer. A second component is resin matrix powder or reinforcing and toughening filler powder.

Description

technical field [0001] The invention belongs to the technical field of resin-based composite materials, and in particular relates to a unidirectional continuous fiber reinforced resin-based composite material prepreg and a preparation method thereof. Background technique [0002] Most of the preparation of continuous fiber-reinforced resin-based composites uses prepregs as precursors. This is because prepregs are easy to use and do not require complicated processes such as weaving. Parts with corresponding properties can be obtained by laying up and curing. At present, the preparation methods of composite prepregs are mainly divided into three categories: solvent method, melting method and mixing method. [0003] The solvent method refers to the use of a solvent to dissolve the active monomer, prepolymer or resin matrix of the resin in the solvent, dipping and arranging, and then evaporating the solvent to form a prepreg. This method has the advantage of low equipment cost a...

AI Technical Summary

Problems solved by technology

[0006] Domestic use of powder to prepare composite material prepreg started late, and the technology is still relatively backward

Patent No. CN102417600 A invented a method of using high boiling point solvent N,N-dimethylacetamide and low boiling point solvent acetone as a mixed solvent to dissolve polyethersulfone, and then adding polyether ether ketone to form a stable suspension for impregnation. However, there are disadvantages such as prepregs containing solvents, which are not easy to store and lay up; high pressure required for molding, and solvents cannot be removed during the pressurization process, which have adverse effects on the performance of composite materials after molding

Patent No. CN 105131520 A has invented a method of improving the wettability and shaping of the powder suspension with polyethylene glycol, but due to the low thermal stability of polyethylene glycol, when the molding temperature is high (such as polyetheretherketone Need to be formed at 390°C) is easy to decompose, not only will cause voids, but also there will be impurities and small molecules remaining, which will affect the performance of composite materials

Patent No. CN 103978696A and Patent No. CN 1044941770 A are both formed by low-boiling point liquid resin powder suspension, but when hot-melting, the powder cannot be fixed when the solvent is evaporated first. There are more contradictions left, and the hot melting process consumes more energy