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Polypropylene composition

A polypropylene composition and polypropylene technology, applied in the field of polymers, can solve problems such as recycling and environmental pollution, affecting the appearance of products, stress whitening, etc., and achieve good stress whitening resistance, broad application prospects, and high stress resistance The effect of whitening properties

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at the same time, this toughening method has the following disadvantages: 1. The addition of rubber will lead to a decrease in rigidity; 2. The introduction of rubber makes the material prone to stress whitening under the action of external force, which affects the appearance of the product
The rigidity can be improved by reducing the rubber content, but the toughness is correspondingly reduced, and the method of adding minerals will bring problems such as recycling and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]1. The impact polypropylene resin (Yanshan Petrochemical, trade name is K6606, the melt index under 230 ℃, 2.16kg load is 6.2g / 10min), polypropylene random copolymer (Yanshan Petrochemical, trade name is 4220, 230 ℃, 2.16kg load under the melt index of 0.3g / 10min, wherein the weight content of comonomer ethylene is 3.8%) and polyethylene homopolymer (Shanghai Petrochemical, trade name MH602, 190 ℃, 2.16kg load under the The melt index is 0.04g / 10min) according to the weight ratio of 80:8:12, adding 0.3% antioxidant, and the antioxidant is made by mixing BASF1010 and BASF168 according to the weight ratio of 1:1. Mix well in a high speed mixer to obtain a polypropylene composition. Then, the polypropylene composition material is melt-blended and extruded at 180-230° C. to pelletize with a twin-screw extruder.

[0034] 2. According to the above-mentioned standards, injection molded samples were tested, and the data are shown in Tables 1 to 3.

Embodiment 2

[0036] Same as Example 1, except that the weight ratio of impact polypropylene resin, polypropylene random copolymer and polyethylene homopolymer is adjusted to 90:4:6. Samples were injection molded according to the above-mentioned standards and tested. The data are shown in Tables 1 to 3.

Embodiment 3

[0038] Same as Example 1, except that the weight ratio of impact polypropylene resin, polypropylene random copolymer and polyethylene homopolymer is adjusted to 75:10:15. Samples were injection molded according to the above-mentioned standards and tested. The data are shown in Tables 1 to 3.

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Abstract

The invention discloses a polypropylene composition which comprises the following components in parts by weight: 70-90 parts of impact polypropylene, 4-20 parts of random polypropylene and 4-20 parts of an ethylene homopolymer. The polypropylene composition provided by the invention is of a multi-phase structure, has a relatively good rigid-tough balance characteristic and also has relatively good stress whitening resistance.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a polypropylene composition. Background technique [0002] Isotactic homopolypropylene resins are widely used in automotive parts, electronic devices, medicine, semiconductor components, household utensils, and textiles. However, its impact strength is low, especially at low temperature, which limits its application. So far, the most effective way to increase the low-temperature toughness of isotactic polypropylene resin (iPP) is to introduce materials such as elastomers and rubber to form heterogeneous materials with polypropylene, which can significantly improve the impact strength of polypropylene. For example, the impact polypropylene containing isotactic homopolypropylene and amorphous ethylene copolymer (rubber phase) can improve the impact strength of the material. But at the same time, this toughening method has the following disadvantages: 1. The addition of rubber will lead to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/08C08L23/14C08L23/16C08L23/06
CPCC08L23/12C08L2201/08C08L2205/035C08L23/0815C08L23/14C08L23/06C08K5/1345C08K5/526
Inventor 刘宣伯郭敏郭梅芳邵静波李娟黄红红盛建舫
Owner CHINA PETROLEUM & CHEM CORP
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