Preparation method of ultralight and high-strength GMT (glass mat reinforced thermoplastic) composite board

Abstract

The invention discloses a preparation method of an ultralight and high-strength GMT composite board. According to the preparation method of the ultralight and high-strength GMT composite board, microballoon foaming agent is introduced into a blend fiber composite mat made of thermoplastic compound fiber and reinforcing fiber through a dusting process and then hot-pressed through continuous compounding equipment into the ultralight and high-strength GMT composite board for automobile interior and exterior trimming, in which the reinforcing fiber serves as a reinforcing body, the thermoplastic compound fiber serves as a bonding matrix, and the microballoon foaming agent serves as filling modifier; the microballoon foaming agent is uniformly dispersed inside the blend fiber composite mat through the dusting process, which is simple, flexible in operation, applicable to continuous production and meanwhile has the advantage of low cost, so that the manufacturing cost can be reduced, preparation of high-price foaming solution can be saved and small environmental pollution can be achieved.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic composite materials for interior and exterior decoration of automobiles, and in particular relates to a preparation method of an ultra-light and high-strength GMT composite plate used for interior and exterior decoration of automobiles. Background technique [0002] Lightweight glass fiber mat reinforced thermoplastic composite sheet (referred to as lightweight GMT sheet), is a new type of composite material composed of continuous glass fiber mat and thermoplastic resin. It has light weight, environmental protection, sound absorption and heat insulation, high strength and toughness, excellent With the characteristics of chemical corrosion resistance and environmental adaptability, it is widely used in the fields of transportation, construction and aviation. The modern automobile industry takes the reduction of body weight as the main development direction of energy saving and consumption red...

AI Technical Summary

Problems solved by technology

[0005] (3) Since the connection between the glass fiber and the hot-melt fiber is a point connection; in order to improve the mechanical properties of the board, the amount of resin is relatively high, so the cost increases, and it is difficult to further reduce the weight of the material

It effectively solves the problems of traditional lightweight GMT, such as the difficulty of further ultra-lightweight, insufficient air infiltration, product design freedom and NVH performance lag far behind foreign imported products, etc.

However, the introduction of microsphere foaming agent through the impregnation process makes it difficult to dry the felt net in the subsequent process and consumes a lot of energy, which is not conducive to continuous production

Moreover, the introduction of foamed microspheres into the felt net through the impregnation process will easily lead to uneven distribution of microspheres, thereby affecting its mechanical properties.

[0009] Patent 200680020471.2 disperses reinforcing fiber, thermoplastic resin powder and microsphere foaming agent in the bubble liquid added with surfactant, and makes a network by papermaking method (also known as papermaking method), but this manufacturing method requires complex structure The device, operation and process are also very complicated, and at the same time, it will cause great pollution to the environment

The cost is relatively high due to the use of surfactants to make the expensive foam solution prepared by reinforcing fibers, thermoplastic resin powder and microsphere foaming agent

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