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Method for improving impact-resistant co-polypropylene stress whitening phenomena

A technology of impact copolymerization and stress whitening, which is applied in the field of synthetic resins, and can solve problems such as white spots on the stress-bearing parts of molded products, improvement of product grade, and influence on product appearance.

Active Publication Date: 2013-01-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, from the application point of view, this ethylene-propylene copolymerized impact polypropylene has a big defect, that is, during the molding or use process, due to local stress, white spots will be generated at the stressed parts of the molded product, which will affect the appearance of the product. Influence, not conducive to improving product quality

Method used

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  • Method for improving impact-resistant co-polypropylene stress whitening phenomena
  • Method for improving impact-resistant co-polypropylene stress whitening phenomena
  • Method for improving impact-resistant co-polypropylene stress whitening phenomena

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Raw material ratio:

[0013]

[0014] Add the accurately metered impact copolymer polypropylene powder, antioxidants 1010 and 168, neutralizer calcium stearate and covering agent titanium dioxide into the 10L high-speed mixer, close the feeding cover of the high-speed mixer and start the high-speed mixer at a low speed , and then switch to high-speed mode and mix for 5 minutes to release the material.

[0015] Adjust the temperature of the feed section, plasticizing section and discharge section of the φ25 twin-screw extruder to 170-180°C, 200-220°C, and 180-200°C respectively, raise the temperature to the preset temperature and stabilize it for 1 hour, and set the preset temperature The mixed material is put into the hopper, and the feeding speed, the speed of the host machine and the traction speed of the pelletizer are adjusted to a suitable ratio, and the material is extruded and sliced ​​to obtain polypropylene pellets.

[0016] Table 1 Comparison of mechanical...

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Abstract

The invention relates to a method for improving impact-resistant co-polypropylene stress whitening phenomena. The method includes uniformly mixing (by weight share) 100 co-polypropylene powder with 0.05-0.20 antioxidant 168, 0.025-0.100 antioxidant 1010, and 0.05-0.20 neutralizer calcium stearate, and 0.025-0.100 shielding agent titanium dioxide via a high-speed mixer, and extruding for granulation to obtain impact-resistant co-polypropylene with stress whitening phenomena improved. The method does not influence original mechanical property and appearance of impact-resistant co-polypropylene, and has the advantages of small adding amount and low cost. It is economic and easy to be realized in a petroleum and chemical enterprise PP polymerization production device.

Description

technical field [0001] The invention relates to a method for improving the stress whitening effect of impact copolymerized polypropylene, which belongs to the field of synthetic resins. Background technique [0002] Many applications of polypropylene (PP) require that it should have good toughness. Due to the relatively high regularity of the molecular structure of homopolymer PP, its mechanical properties are hard and brittle, and its impact resistance is poor. The method of elastomer blending or certain ethylene copolymerization can be significantly improved. At present, the method commonly used in petrochemical plants is block polymerization to produce impact copolymer PP process, that is, first homopolymerize propylene and then copolymerize with ethylene to form ethylene-propylene rubber (EPR) binding phase. Acrylic impact resistance. Due to the good performance-price ratio of impact copolymerized PP, it continues to replace the original metal and other resins in the f...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08K13/02C08K5/098C08K3/22
Inventor 周豪李敏韩明哲张宝林金丽晓李志峰
Owner PETROCHINA CO LTD