A kind of composite material prepreg for ultraviolet curing structure repair and preparation method thereof

Abstract

The invention provides a composite material prepreg for repairing glass fiber-reinforced resin-based structures with a certain thickness of ultraviolet light rapid curing and a preparation method thereof. This method uses ordinary free radical curable resin as the matrix, selects appropriate photoinitiators, thermal initiators and other additives to form a "light-thermal composite initiation system", uses glass fiber fabrics as reinforcing materials, and adopts appropriate composite processes. into a composite material prepreg with a certain thickness. The prepreg can be fully cured within 10 minutes by irradiating one side of ultraviolet light, and the thickness of one-time photocuring can reach more than 15mm. The invention solves the technical problem that the current ultraviolet light cannot cure large-thickness (10-15mm and above) composite material structural parts at one time, and makes the curing of the composite material prepreg more convenient and efficient. This light-curing resin and its composite materials have shown great application prospects and market potential in some specific fields such as trenchless repair of municipal drainage pipes.

Description

technical field [0001] The invention relates to the field of materials, in particular to a composite material prepreg with a relatively large thickness (10-15mm) cured by one-time single-sided irradiation of ultraviolet light (within 10 minutes) and using a free radical curable resin as a matrix and its preparation method. Background technique [0002] With the continuous development of the application of polymer composite materials, its curing methods are becoming more and more abundant to meet various actual needs. The rapid UV curing technology of composite resin matrix has developed rapidly in recent years. Compared with traditional thermal polymerization, UV curing has a series of outstanding advantages: ① Fast speed, which can be cured within a few seconds at the fastest, which greatly saves time , which improves production efficiency; ② less pollution, most of the diluents used for UV curing are active monomers, which participate in the curing reaction, and the solid...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the cured thickness is limited (within about 5mm) in the ultraviolet light curing of composite materials at present, the curing of thicker products is not complete (the curing degree of the shadow and the backlight part is not enough), the curing is uneven and the mechanical properties of the cured product Poor and other problems, provide a composite material prepreg and its preparation method that can be used in some specific fields such as non-excavation light-cured rapid repair of municipal drainage pipes, and solve the problem that large thickness (above 10mm) composite products cannot pass through ultraviolet rays. Technical problems of light one-time fast curing (within 10min)