A continuous deformation composite profile and its preparation method

Abstract

The invention discloses a continuous deformation composite material profile and a preparation method thereof. The preparation method comprises the following steps in sequence: S1. impregnating continuous longitudinal fibers with resin to obtain a prepreg, and continuously welding or extruding the metal to obtain a tube blank; S2 .Continuously bring the prepreg into the tube blank to obtain the material to be deformed; S3. Synchronously drive the prepreg and tube blank of the material to be deformed, change the section of the tube blank by drawing or rolling process or / and deform the tube blank through the action of the mold Spatial form, to obtain continuous materials to be formed with the same or different spatial forms; S4. Heating the materials to be formed, to obtain continuous deformation composite material profiles with the same or different spatial forms, including core materials formed by cross-linking and curing of prepregs And the armor layer formed by deformation of the tube blank can continuously prepare the continuous deformation composite material profile, and the availability of the continuous deformation composite material profile can guarantee the value engineering design of the composite material that needs to integrate all aspects of performance requirements.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a continuous deformation composite material profile and a preparation method thereof. Background technique [0002] The high-strength fiber composite material profile produced by bundling many long high-strength fibers and impregnating them with resin has high tensile strength, low stretchability, light weight, and excellent corrosion resistance. Therefore, it is being widely used in bridges, concrete structures, power lines, etc. [0003] In the prior art, the process of preparing high-strength fiber composite profiles is as follows: First, continuous carbon fiber and other fiber materials are twisted and fixed together, and then fully impregnated through the epoxy resin impregnation tank of the base material, and then formed by extrusion The mold is pulled out, and the bundled product after pulling out finally passes through the curing room to allow the resin to fully harden...

AI Technical Summary

Problems solved by technology

These production methods have a common problem that cannot be avoided: when the resin in the prepreg is heated and cross-linked and cured, it will go through a low-viscosity viscous flow state, a gel state, and a glass state in sequence. The tightly wound ribbons on the surface of the prepreg , which cannot prevent it from being twisted into cables or severely deformed when heated, resulting in resin leakage, and bubbles are generated during the curing reaction due to insufficient pressure holding; in addition, resin penetration will lead to adhesion and curing of the wires, and the twisted structure will be lost. It should have the winding characteristics, but the ability to resist breakage is poor

[0004] In order to improve the resistance to breakage of the wire, CN105304189A uses the pultrusion technology to make a composite wire with a diameter of 1.7-4.0mm, uses the longitudinal cladding welded pipe technology to armor the wire with stainless steel with a thickness of 0.1-0.2mm, and then twists multiple wires with stainless steel armor. The load-bearing profile of this structure solves the contradiction between easy bending and anti-breakage, but in the process of twisting into a cable, the profile is forced to elastically deform from a straight line to a helix, because the profile with an armored layer The production is made by continuous pultrusion technology of composite materials. Since the continuous fiber material impregnated with resin must be cured in the cavity mold, during the curing process, the continuous fiber material impregnated with resin will be separated from the cavity mold in which it is located. Relative movement, if the cross-sectional shape and size of the cavity mold or the spatial form of the cavity mold are deformed during their relative movement, it will inevitably cause the relative movement to be blocked or even stop, and the above-mentioned low-viscosity viscosity cannot be controlled in the process. The curing process of resin in fluid state, gel state or glass state, so the preparation of continuous deformation composite material profiles cannot be realized

[0005] On the other hand, due to the continuous fiber composite profile preparation method in the prior art, the continuous fiber material impregnated with resin, which is usually called prepreg, when pulled into the extrusion molding die, the excess resin is only The edge of the extrusion die or the pre-filtering device is passively filtered, so the volume ratio of the resin in the cured profile often exceeds the actual product performance requirements, that is, the composite material profile under a given cross-sectional area is reduced. Key performance indicators such as strength and winding characteristics, which increase the cost and weight of the product

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