Preparation method of hybrid fiber reinforced polypropylene high-intensity composite material

Abstract

The invention discloses a preparation method of a hybrid fiber reinforced polypropylene high-intensity composite material. The preparation method specifically comprises the following steps: mixing a glass fiber with a Kevlar fiber, and dipping by a modified plastic component melt so as to obtain a modified plastic-coating continuous hybrid fiber; then directionally configuring the hybrid fiber obtained by treatment, carrying out hot pressing, cooling and cutting so as to obtain a modified plastic-coating continuous hybrid fiber thin sheet; and finally, laminating the fiber thin sheet and a polypropylene resin thin sheet at an interval, and carrying out hot pressing so as to obtain the hybrid fiber reinforced polypropylene high-intensity composite material. The prepared composite material has an outstanding interface binding comprehensive performance, moreover is high in fiber content, can be configured continuously and directionally, and can be used for preparing a thermoplastic composite material sheet product through a hot-pressing technology, and the product has excellent mechanical property and intensity designablity.

Description

technical field [0001] The invention belongs to the technical field of modification and processing of polymer composite materials, and in particular relates to a preparation method of hybrid fiber-reinforced polypropylene high-strength composite materials. Background technique [0002] Glass fiber reinforced thermoplastic composite (GMT) is a kind of composite material with thermoplastic resin as matrix and glass fiber or continuous glass fiber mat as reinforcement material. It has excellent mechanical properties, especially outstanding impact resistance, corrosion resistance, low The advantages of cost, easy processing, no storage period limit, recyclability and repeated processing make up for the shortcomings of thermosetting composite materials, and have important application prospects. With the continuous development of automobile, chemical and other industries in the international market, the demand for thermoplastic composite materials continues to increase, and the de...

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Problems solved by technology

However, compared with foreign countries, there is a big gap between my country's reinforced substrates in terms of variety and quality, so we must have greater determination and greater efforts to research and develop, and we must work hard to improve the quality of high-viscosity plastics and glass. The bonding force and uniform dispersion of the fiber must be dealt with properly; at the same time, a variety of pre-mixing measures should be taken, and the structural form of the glass fiber fabric should be designed more reasonably

[0004] With the research and development of fiber-reinforced thermoplastic composite materials, Chinese Patent No. CN103146073A discloses a glass fiber-reinforced polypropylene composite material, which is composed of homopolypropylene, glass fiber, PP-g-MAH, compatibilizer, coupling The agent is made by extrusion granulation process. Although the preparation process of the material is relatively simple, the strength level of the material is not high. Its tensile strength is only 60-80MPa, and the impact strength is 35-45J / m. For areas with high strength requirements

Chinese Patent No. CN102603980A discloses a glass fiber reinforced polypropylene composite material and its preparation method. The method is to inject polypropylene, polypropylene wax, maleic anhydride, N,N-dimethylethanolamine, etc. through twin-screw extrusion The glass fiber reinforced polypropylene composite material is made by molding process. The tensile strength of the composite material made by this method is 60-80MPa, and the notched impact strength is up to 192KJ / m 2 , from the perspective of its strength, it cannot meet the requirements of fiber-reinforced polypropylene high-strength composite materials

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