Polyamide composite material capable of being subjected to gas-assisted molding

Abstract

The invention provides a polyamide composite material capable of being subjected to gas-assisted molding. The polyamide composite material is prepared from the following raw materials in percentage byweight: 37 to 86.7% of polyamide resin, 10 to 40% of flat glass fibers, 2 to 8% of an impact modifier, 0.5 to 5% of ultrahigh molecular weight polyethylene, 0.2 to 2% of polyethylene glycol, 0.1 to 3% of a coloring agent and 0.5 to 5% of an additive. According to the composite material, the melt strength of the composite material is improved, gas-assisted molding becomes easy, polyethylene glycoland polyamide can also form an intermolecular hydrogen bond interaction, the crystallization temperature of the composite material is reduced, the appearance is improved, the flat glass fibers are beneficial to providing more isotropic dispersion, the fluidity of the composite material is improved, and the appearance is further improved.

Description

technical field [0001] The invention relates to the technical field of engineering plastics, in particular to a gas-assisted molding polyamide composite material. Background technique [0002] Glass fiber reinforced polyamide has excellent mechanical strength, wear resistance, heat resistance, chemical corrosion resistance, etc., and is widely used in automobiles, rail transit, electronic appliances and other fields. With the requirements of various industries for light weight, environmental protection and low cost of products, gas-assisted molding technology has attracted more and more attention. In order to facilitate gas-assisted molding, the mold is usually designed with an overflow well to ensure that the gas can be filled smoothly in the cavity, but the weight of the overflow is generally relatively large, especially for smaller parts, the weight of the overflow and the product The ratio is even close to or exceeds 1. For glass fiber reinforced polyamide materials, th...

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Problems solved by technology

The patent CN110305469A application discloses a polyamide composite material that can be used for gas-assisted molding. It uses high-viscosity nylon 6 material, adds high-flow nylon copolymer resin, glass beads, etc., and greatly improves the gloss of the appearance of reinforced modified composite products. However, the introduction of high-flow nylon copolymer resin and glass microspheres usually leads to a decrease in the impact performance of composite materials.

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