Direct on-line pultrusion process for fiber reinforced thermoplastic composite material

Abstract

The invention relates to a direct on-line pultrusion process for a fiber reinforced thermoplastic composite material, and belongs to the technical field of production and processing of thermoplastic composite materials. In the pultrusion process, a glass fiber yarn, glass fiber cloth, a glass fiber felt and the like are processed by a bundling and weaving device to form fiber prepreg; the bundledand woven fiber prepreg is rolled and infiltrated on a constant-temperature stainless steel strip on which molten resin is laid by a pressing steel strip to form a composite blank; the composite blank passes through a preforming mold and a forming mold in turn and is cooled by a cooling device to form a continuous finished product section; and the section is cut by a cutting device to form a finished product section with required length. Raw material components are polyester resin, glass fibers, silane coupling agent particles, bismaleimide, an ultraviolet absorbent, an antioxidant and a filler. The forming process comprises the following steps of: melting and laying resin on a bottom layer; preparing the fiber prepreg; laying the resin on a top layer; performing pressure infiltration; finishing the blank and adjusting the temperature; preforming; forming; cooling for shaping; and cutting the finished product, namely cutting by using the cutting device to form the finished product section with the required length.

Description

technical field [0001] The invention belongs to the technical field of production and processing of thermoplastic composite materials, and in particular relates to a new technology of direct online pultrusion of fiber-reinforced thermoplastic composite materials. Background technique [0002] At present, the direct online production of fiber-reinforced thermoplastic composites mainly adopts direct molding and direct injection molding processes. The process of direct molding method and direct injection molding method is similar. The cutting and dispersion of glass fiber and the compounding of glass fiber and polymer are all carried out in the screw extruder. The resulting problem is that the length of glass fiber is affected by the pitch of the screw. Generally, it can only reach about 20mm~25mm. Due to the wear of the glass fiber by the screw, the performance of the product is reduced. The screw structure is relatively fixed, and different screw elements need to be replace...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a direct online pultrusion molding process of fiber-reinforced thermoplastic composite materials to solve the disadvantage of the prior art direct molding method that it is impossible to produce shapes such as pipes, rods, and profiled materials. The direct injection molding method Due to the limitations of the process, the length of the reinforcing fiber in the produced pipes, rods, profiles and other profiles is extremely short, and the mechanical properties are low.