Preparation method of high-impact transparent polypropylene resin

A technology of transparent polypropylene and high impact resistance, applied in the field of high-end new materials, can solve the problems of difficult operation, low impact strength at room temperature, poor transparency of ethylene-propylene block copolymers, etc., achieve high transparency, increase low temperature resistance and The effect of toughness

Inactive Publication Date: 2021-01-15
NORTH HUAJIN CHEM IND CO LTD
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Problems solved by technology

[0009] In order to solve the problems of low normal temperature impact strength of polypropylene resin products, poor transparency of ethylene-propylene block copolymers, complicated polymerization process and relatively difficult operation, the present invention provides a preparation method of high-impact transparent polypropylene resin, which increases product transparency Performance, improve the impact performance and rigidity of the product

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  • Preparation method of high-impact transparent polypropylene resin

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Embodiment Construction

[0050] The present invention will be described in detail below in conjunction with drawings and embodiments.

[0051] figure 1 A schematic diagram of the apparatus for preparing polypropylene resin is given.

[0052] in:

[0053] 1. To produce high-impact transparent polypropylene, the main catalyst uses Ziegler-Natta's fourth-generation ZN catalyst, the main component of which is TiCl 4 , Carrier MgCl 2 , The internal electron donor, the external electron donor is cyclohexylmethyldimethoxysilane (Donor-C), and the activator is triethylaluminum (TEAL). During production, external electron donor and triethylaluminum, loop reactor propylene and triethylaluminum are all controlled in a certain ratio range.

[0054] 2. As the chain transfer agent of polymerization reaction, hydrogen has the function of adjusting the molecular weight and controlling the melt index of the product. During production, the amount of hydrogen added is adjusted according to the target index. The amou...

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Abstract

The invention belongs to the field of high-end novel materials, and discloses a preparation method of high-impact transparent polypropylene resin. According to the method, by adjusting the addition amount of ethylene in a loop reactor R201 / R202, the content of a random copolymer in a polymer is increased, the crystalline phase density of a product is reduced, and a crystalline phase and a non-crystalline phase have a similar refractive index, so the transparency of the product is improved; a polymerization reaction is continuously carried out in a gas-phase copolymerization kettle, a certain amount of ethylene is added to adjust the ratio of gas-phase composition C2<-> / (C2<->+C3<->) so as to improve the impact property of the product; and in the granulation molding stage of the product, acompound additive is added, so the crystal nucleus of the product is reduced, crystal nucleus density is increased, a crystallization rate is increased, crystallinity is increased, the haze of the product is reduced, and the rigidity of the product is improved.

Description

technical field [0001] The invention belongs to the field of high-end new materials and relates to a preparation method of polypropylene resin. Background technique [0002] Polypropylene is a widely used thermoplastic resin. It combines excellent mechanical properties and low cost. It has good non-toxicity and chemical corrosion resistance. It has broad market prospects and has become the fastest growing among the five general-purpose synthetic resins. The most active breed. In recent years, with the rapid development of coal-to-olefin and propane dehydrogenation technologies, the total output of polypropylene in my country has increased significantly. my country has become the world's largest polypropylene consumer, accounting for 30% of global consumption. Through market research, it is found that the annual demand for transparent polypropylene in the country is as high as 1 million tons, and most of the products are random transparent polypropylene. Due to its own char...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/00C08K5/134C08K5/526C08K5/053C08F293/00
CPCC08K5/1345C08K5/526C08K5/053C08F293/00C08L2205/24
Inventor 付传玉张彬刘忠全庄松赵胤衡王楠付莹赵欣麟朱勇飞肖大君李鹤张帆
Owner NORTH HUAJIN CHEM IND CO LTD
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