Method for preparing high-strength polymer composite material

Abstract

The invention discloses a method for preparing a high-strength polymer composite material. The method comprises the following steps of: S1: modifying a monomer into nano inorganic particles by chemical graft polymerization, and melting, blending and extruding the modified nano particles and a thermoplastic polymer to manufacture a rod-like preformed blank, or melting, blending and stamping the modified nano particles and the thermoplastic polymer to manufacture a flaky preformed blank, wherein the molar amount of the monomer is same as that of nano inorganic particles, the consumption of the nano inorganic particles is 1 to 3 weight percent of the thermoplastic polymer; S2: stretching the preformed blank at a temperature of between 130 and 150 DEG C and at a speed of 10 to 50 millimeters per minute, and cooling to obtain a fiber-like or flaky reinforced phase; and S3: preparing a film from a copolymer with melting point of 140 to 150 DEG C by a film blowing method, and preparing the composite material from the oriented reinforced phase and a matrix phase with low melting point through a tensile force self-adjusting die by a thin layer bedding-hot pressing method. By combining a self-reinforcing technology and an inorganic particle filling modified polymer composite material, the polymer composite material with remarkably improved tensile strength and tensile modulus can be obtained.

Description

technical field [0001] The invention relates to a method for preparing high-strength polymer composite materials by combining nanometer reinforcement and self-reinforcement technologies. Background technique [0002] The development of some special fields such as aviation industry, military industry and other fields put forward higher requirements for the performance of polymer materials, such as high strength, high modulus, light weight and so on. To improve the mechanical strength of polymer materials, the traditional modification method of using fibers (such as glass fibers or carbon fibers) to reinforce and increase the molecular weight of polymer materials can improve the mechanical strength of polymers to a certain extent, but brings material Increased specific gravity and increased viscosity make processing difficult, which cannot meet the urgent needs of current high-end products for transparent, lightweight and high-performance materials. [0003] The theoretically...

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Problems solved by technology

Because when the oriented material is used to prepare the applied material, the processing process inevitably has the existence of disorientation of the molecular chain, which will eventually affect the performance of the composite material.

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