Glass fiber reinforced polypropylene compound material and preparation method thereof

Abstract

The invention relates to a glass fiber reinforced polypropylene compound material and a preparation method thereof. The glass fiber reinforced polypropylene compound material comprises the following raw materials: 20-40% of copolymerized polypropylene I, 20-40% of copolymerized polypropylene II, 5-25% of compatibility agent, 0.2-1% of coupling agent, 1-30% of glass fiber, 1-20% of sericite and 0.1-0.4% of antioxidant, wherein the copolymerized polypropylene I is high-impact copolymerized polypropylene with the impact strength of more than 80 J / m; the copolymerized polypropylene II is high-rigidity copolymerized polypropylene with the flexural modulus of more than 1200 Mpa; the diameter of the glass fiber is 8-17 microns; and the particle size of the sericite is 800-1250 meshes. According to the glass fiber reinforced polypropylene compound material, the effect of very low warpage and even no warpage can be achieved on the premise of keeping high heat resistance and high rigidity.

Description

technical field [0001] The invention relates to a glass fiber reinforced polypropylene composite material and a preparation method thereof. Background technique [0002] Generally, glass fiber reinforced polypropylene composite materials have high rigidity and heat resistance, but on the one hand, because the length of glass fiber distributed in polypropylene resin is much larger than the diameter of glass fiber, in thinner product parts, The orientation of glass fibers can easily lead to product warping; on the other hand, polypropylene is a crystalline polymer, and the size of polypropylene spherulites and crystallization cycle directly affect the degree of warping of glass fiber reinforced polypropylene products. [0003] Patent CN1479765A discloses a low warpage polypropylene resin composition. The matrix resin of the composition is isotactic polypropylene homopolymer, unsaturated carboxylic acid or its derivatives are added to modify polypropylene, and the inorganic fil...

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Problems solved by technology

[0005] The blending of styrene and polypropylene in CN1315465A produces an alloy with a sea-island structure. Styrene resins are not oil-resistant. In places where lubricating oil is in contact, although the content of styrene resins is not high, it will also drastically reduce the use of materials. The impact of life and heat resistance is not as great as that of corrosion resistance; at the same time, the price of styrene resin is higher than that of polypropylene, which also increases the cost of the product; in general, the modification principles of the two technologies are different

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