Low-temperature impact-resistant and low stress whitening-resistant long glass fiber reinforced polypropylene material, and preparation method and application thereof

Abstract

The invention discloses a low-temperature impact-resistant and low stress whitening-resistant long glass fiber reinforced polypropylene material, comprising, by weight, 10%-80% of long glass fiber reinforced polypropylene masterbatches and 20% -90% of low-temperature impact-resistant and low stress whitening-resistant masterbatches, wherein the long glass fiber reinforced polypropylene masterbatches comprise, by weight, 0%-80% of co-polypropylene, 0%-80% of homo-polypropylene, 10%-60% of glass fibers, 1%-10% of grafted polypropylene, 0.1%-2% of an antioxidant and 0.2-2% of a processing agent; the low-temperature impact-resistant and low stress whitening-resistant masterbatches comprise, by weight, 50%-95% of co-polypropylene, 0-30% of a grafted elastomer, 0-20% of a brominated flame retardant, 0.1%-2% of an antioxidant and 0.2-5% of a processing agent. The polypropylene material prepared by the method improves the characteristic of low-temperature impact resistance and reduce generation of stress whitening. A finished product prepared by the material has good drop impact resistance, and can be used for workpieces such as packing cases or electric tools, etc.

Description

technical field [0001] The invention relates to a reinforced modified polypropylene material, in particular to a low-temperature impact-resistant, low-stress whitening long glass fiber reinforced polypropylene material and a preparation method and application thereof. Background technique [0002] Polypropylene resin (PP) is a general-purpose plastic with a wide range of uses. It is obtained by polymerization of propylene monomer. The advantages of polypropylene resin are low density, low price, excellent chemical corrosion resistance, good mechanical properties, Good formability. As a typical crystalline material, its melting point is around 165°C. After adding glass fiber to strengthen it, its mechanical properties will be greatly improved, and it can be used as structural parts in household appliances, automotive materials or tool industries. [0003] In practical applications, long glass fiber reinforced polypropylene materials can replace steel and reinforced engineeri...

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Problems solved by technology

[0007] The defect of the above prior art is that it only pays attention to the stability and improvement of the initial mechanical properties of the material, and does not involve the low temperature characteristics of the material, and the general parts also have strength requirements in the low temperature process, such as home appliance parts, electric tools and packaging products. Under low temperature conditions, there are requirements for drop and impact. The parts will generate silver streaks to absorb energy under the action of external force, and the silver streak area will be white in the macroscopic surface state, which will affect the appearance of the parts. Low temperature mechanical properties, especially tensile strength, bending strength and impact strength, are relatively high, and ordinary filling materials cannot meet the requirements

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