Continuous glass fiber reinforced polyurethane foam material forming process and system

Abstract

The invention discloses a continuous glass fiber reinforced polyurethane foam material forming process and system. The process comprises the following steps of forming a polyether polyol mixture, and respectively adding the polyether polyol mixture and isocyanate into two storage tanks; pulling loosened continuous glass fiber filaments through traction equipment to pass through a vertically-arranged forming mold; meanwhile, fully mixing two components of polyether polyol and isocyanate through a foaming machine, and injecting the mixture into a mold cavity in multiple directions; performing ultrasonic treatment to fully infiltrate the glass fiber filaments; foaming and curing the impregnated glass fibers under the action of microwaves; and cooling a shaping device and performing fixed-length cutting to obtain a continuous glass fiber reinforced polyurethane foam profile. The mold is vertically arranged, and a high-vacuum impregnation area, an ultrasonic infiltration device and a microwave curing device are arranged, so that uniform dispersion and arrangement of glass fibers in the inner cavity of the mold are facilitated; and the defects that the glass fibers droop in the mold, so that the density of the glass fibers at the lower part of the inner cavity is high, the density of the glass fibers at the upper part is low and pores are great are overcome.

Description

technical field [0001] The invention relates to the technical field of polyurethane composite material preparation, in particular to a continuous glass fiber reinforced polyurethane foam material molding process and system thereof. Background technique [0002] Polyurethane (PU) foaming materials are widely used in refrigerator insulation, shoe soles, building wall panels, mattresses, and automotive interior parts. [0003] At present, the pultrusion preparation technology using continuous fiber reinforced rigid polyurethane profiles has been used for the preparation of various load-bearing structural products, but due to the limitation of process conditions, the existing defects are as follows: [0004] First, high pressure is used to forcibly squeeze the polyurethane raw material between the reinforcing fibers, forcing the air that cannot be discharged to be squeezed between the reinforcing fibers and the resin, forming poor interfacial bonding, resulting in the mechanical...

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Problems solved by technology

[0004] First, high pressure is used to forcibly squeeze the polyurethane raw material between the reinforcing fibers, forcing the air that cannot be discharged to be squeezed between the reinforcing fibers and the resin, forming poor interfacial bonding, resulting in the mechanical properties of the finally obtained reinforced polyurethane profiles Poor; second, using high-pressure forced extrusion process, polyurethane can not be foamed at all, and reinforced polyurethane microcellular foam profiles cannot be obtained at all; third, due to the existing inherent molding process system, the mold is set horizontally, and the glass fiber is in the mold. Sagging in the middle, resulting in high density of glass fiber in the lower part of the inner cavity, low density in the upper part, and large pores, thus affecting its mechanical properties and poor mechanical properties. At the same time, through the ordinary glass fiber infiltration process, the infiltration effect is poor, which affects the mechanical properties of the final product

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