A kind of pp/pa composite material for automobile interior and exterior decoration and preparation method thereof

Abstract

The invention discloses a PP / PA composite material for automobile interior and exterior and a preparation method of the PP / PA composite material. The PP / PA composite material comprises the following components in parts by weight: 60-80 parts of polypropylene, 20-40 parts of polyamide, 1-4 parts of modified talcum powder, 3-5 parts of a grafting compatilizer, 0.5-1 part of a flowing modifier, 0.2-0.4 part of an antioxidant, 0.2 part of a light stabilizer, 0.5-2.5 parts of montmorillonite, 10-30 parts of an inrumescent flame retardant and 1-4 parts of a coloring agent, wherein the grafting compatilizer is polypropylene grafted maleic anhydride. The preparation method comprises the following steps: firstly, mixing the compounded inrumescent flame retardant and montmorillonite in a melt blending mode, carrying out mixing and melting granulating on modified talcum powder and polypropylene in advance, feeding the two mixtures together with other components into a mixing pot in different batches, mixing uniformly, carrying out extrusion pelletizing by using a double-screw extruder, thereby preparing the PP / PA composite material. By adopting the PP / PA composite material, the problem of water absorption of a conventional PP / PA composite material is solved, the wear resistance, the anti-aging property and the flame retardancy of the conventional PP / PA composite material are improved, the service life of the PP / PA composite material is prolonged, and the security coefficient of the PP / PA composite material is increased.

Description

technical field [0001] The invention relates to a composite material, in particular to a PP / PA composite material used for interior and exterior decoration of automobiles. Background technique [0002] Nylon is an important engineering plastic. It has high strength, small friction coefficient, excellent wear resistance and oil resistance, good chemical stability, self-lubrication, insulation, self-extinguishing and other excellent properties. It has excellent processing flow properties and is widely used in Automotive, electrical and electronic, machinery and construction industries. However, due to the presence of amide polar groups in nylon, it has strong water absorption, low low-temperature toughness, and poor dimensional stability, so its application is limited; in addition, PA6 has low low-temperature impact strength and insufficient dry toughness. Creep performance also needs to be improved. Polypropylene (PP) is easy to process, heat-resistant, has low water absorp...

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Problems solved by technology

[0003] PP / PA materials are water-absorbent, and injection molding manufacturers must dry the materials when injecting products, which increases costs and wastes energy

And the compatibility of PP / PA materials is poor, simply blending the two materials, the mechanical properties of the materials are very poor, it cannot be popularized and applied, and the cost is high

At present, PP / PA materials use non-environmentally friendly flame retardants, such as halogenated flame retardants, which are very harmful to the human body and the environment; and some intumescent flame retardants are easy to absorb moisture, have poor aging performance, and are difficult to recycle. question

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