Thermoplastic pultrusion once-forming process

Abstract

The invention relates to a thermoplastic pultrusion once-forming process and belongs to the field of thermoplastic composite material production and processing. The thermoplastic pultrusion once-forming process sequentially comprises the following steps of yarn distribution, wherein yarn is placed on a yarn rack; yarn arranging, wherein the yarn on the yarn rack is subjected to threading, arranging and carding; glass fiber infiltration, wherein the arranged and carded yarn is injected into a gum dipping area by means of extrusion by screw rod extrusion equipment and high temperature, and resinmelts at high temperature to realize glass fiber infiltration; forming traction, wherein resin obtained after gum dipping passes through a preforming mold and is directly formed after heat preservation and cooling, and then a product is pulled out through traction; and cutting. The thermoplastic pultrusion once-forming is simple and reasonable in process design, stable, reliable and quick in forming, realizes continuous pultrusion once-forming, and meets use requirements.

Description

technical field [0001] The invention relates to a process, in particular to a thermoplastic pultrusion one-time molding process, which belongs to the field of production and processing of thermoplastic composite materials. Background technique [0002] Thermoplastic pultrusion has the characteristics of strong flexibility, impact resistance, good damage resistance, recyclability, and reusability. However, this process is restricted by the following disadvantages: such as high melt viscosity, high molding temperature, solid matrix at room temperature, precise control of cooling and large shrinkage during melt cooling, and large fluctuations in product quality. [0003] The key problems encountered in thermoplastic matrix pultrusion mainly include: the matrix is ​​solid at room temperature, poor fluidity (high viscosity) at melting temperature, and large shrinkage when the melt is cooled. [0004] Generally, the thermoplastic composite pultrusion process can be divided into t...

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Problems solved by technology

[0009] The prepolymer pultrusion process uses the monomer and initiator to soak the glass fiber in the melting stage, and the resin polymerizes during the soak; the monomer and the initiator need to polymerize during the glass fiber soaking process, and the degree of reaction needs to be Accurate control, the production process is more complicated, and the production speed is limited

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