Polypropylene composition, and preparation method and application thereof

A technology for polypropylene composition and homopolypropylene, which is applied in the field of polypropylene composition and its preparation, can solve the problems of destroying polypropylene crystallinity, decreasing rigidity, hardness and heat resistance, and increasing haze.

Inactive 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

However, the ethylene-propylene rubber and homopolypropylene produced by this method will undergo phase separation, leading to an increase in the haze of the final product. Many such as patent CN89109800.3, patent CN01801535.2, and patent CN200610076044.8, are polymerized in the first step of polymerization The ethylene-propylene random copolymer is obtained to destroy the crystallinity of polypropylene, so that the compatibility between the rubber phase and the matrix prepared in the second step of polymerization is improved, thereby improving the transparency of the product, but such The practice will obviously reduce the rigidity, hardness and heat resistance of the final product

Method used

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  • Polypropylene composition, and preparation method and application thereof
  • Polypropylene composition, and preparation method and application thereof
  • Polypropylene composition, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The polypropylene composition in the present invention and its embodiment obtains by following method:

[0063] The main catalyst (titanium-containing active solid catalyst component) is obtained by the method described in Example 1 of Chinese patent CN93102795, its Ti content: 2.4wt%, Mg content 18.0wt%, di-n-butyl phthalate content: 13wt %.

[0064] The polymerization reaction was carried out on a polypropylene pilot plant.

[0065] Polymerization method and steps are as follows:

[0066] Pre-polymerization: After the main catalyst, co-catalyst (triethylaluminum) and external electron donor are pre-contacted at 10°C for 20 minutes, they are continuously added to the pre-polymerization reactor for pre-polymerization reactor, and the triethyl aluminum that enters the pre-polymerization reactor The flow rate of base aluminum (TEA) is 6.33g / hr, the flow rate of methylcyclohexyldimethoxysilane (CHMMS) is 0.63g / hr, and the flow rate of main catalyst is 0.01g / hr. The pre-...

Embodiment 2

[0073] The catalyst used in embodiment 2, pre-complexation and polymerization process conditions are identical with embodiment 1. The difference from Example 1 is that in Example 2, the hydrogen concentration in the loop reactor is 400ppm, and the hydrogen concentration in the gas phase reactor is 160000ppm. The specific process conditions are shown in Table 1. The obtained polymer product was measured according to the same method as in Example 1, and the results are shown in Table 2.

Embodiment 3

[0075] The catalyst used in embodiment 3, pre-complexation and polymerization process conditions are identical with embodiment 1. The difference from Example 1 is that in Example 3, the hydrogen concentration in the loop reactor is 800ppm, the ethylene / (ethylene+propylene)=0.1 (volume ratio) in the gas phase reactor, and the hydrogen concentration is 47000ppm. The specific process conditions are shown in Table 1. The obtained polymer product was measured according to the same method as in Example 1, and the results are shown in Table 2.

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Abstract

The invention relates to a polypropylene composition. The polypropylene composition includes 60-95wt% of highly stereoregular polypropylene homopolymer and 5-40wt% of propylene-ethylene copolymer elastomer, wherein a ratio of the melt mass flow rate of the highly stereoregular polypropylene homopolymer to the melt mass flow rate of the polypropylene composition is 0.1-1.1, and preferably 0.3-0.8; and the molecular weight distribution of the polypropylene composition is greater than 5. The invention also provides a preparation method of the polypropylene composition, and an application of the polypropylene composition in packaging materials or molded products as a transparent anti-impact material.

Description

technical field [0001] The invention relates to a polypropylene composition and a preparation method thereof. Specifically, the propylene copolymer composition of the present invention has high transparency, good impact resistance and excellent stress whitening resistance, and can be used to produce films or molded articles. Background technique [0002] Polypropylene material has been widely used in various industries because of its high quality, low price, high temperature resistance, easy processing and molding. With the improvement of people's living standards, people's demand for product beauty is also increasing. In the fields of toys, packaging, medical equipment, and daily necessities, people prefer to use resins with better transparency. Therefore, transparent impact polypropylene with high transparency, good impact resistance and excellent stress whitening resistance has attracted more and more attention from the industry. [0003] Clear impact polypropylene comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/16C08F110/06C08F210/16C08F2/00
CPCC08L23/12C08F110/06C08F210/06C08F210/16C08L2201/08C08L2201/10C08L2205/18C08L2207/10
Inventor 宋文波张晓萌郭梅芳张师军胡慧杰魏文骏
Owner CHINA PETROLEUM & CHEM CORP
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