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Preparation method of high impact resistance polypropylene

A technology of high-impact polypropylene and a polymerization method, which is applied in the field of preparation of high-impact polypropylene, can solve problems such as inability to take into account, and achieve the effects of easy operation, easy implementation, and low cost

Active Publication Date: 2019-04-26
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, among the currently disclosed technologies, none of the above three properties can be taken into account.

Method used

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  • Preparation method of high impact resistance polypropylene
  • Preparation method of high impact resistance polypropylene
  • Preparation method of high impact resistance polypropylene

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The main catalyst (titanium-containing solid catalyst active component) is obtained by the method described in Example 1 of Chinese Patent 201310552108.7, and its titanium content: 2.76%, magnesium content: 18.0%, diisobutyl phthalate content: 7.54%. The polymerized monomers are propylene and ethylene.

[0053] Polymerization was carried out in a Spheripol double loop plus single gas phase reactor setup.

[0054] Pre-polymerization: The main catalyst, co-catalyst (triethylaluminum), and the first external electron donor (tetraethoxysilane) are continuously added to the pre-polymerization reactor at 10°C and pre-contacted for 20 minutes. The flow rate of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow rate of tetraethoxysilane (the first external electron donor, Donor-A) is 0.63g / hr, and the flow rate of the main catalyst is 0.01g / hr. Wherein, TEA / Donor-A mass ratio is 10. The pre-polymerization is carried out in the environment of...

Embodiment 2

[0062] The process of embodiment 2 to embodiment 6 is the same as that of embodiment 1, only the addition amount of each component is different, as shown in table 1 for details, and as shown in table 2 for the performance test.

Embodiment 7

[0064] Embodiment 7 to embodiment 8 are the same as embodiment 1 process, wherein main catalyst selects commercially available CS-II spherical magnesium chloride carrier catalyst, and the addition amount of each component is different in the polymerization process, as shown in table 1 specifically, performance test See Table 2.

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Abstract

The invention provides a polymerization process of high impact resistance polypropylene. The polymerization process specifically comprises the steps that (1) a first external electron donor with excellent hydrogen sensitivity is added into a first-stage loop propylene homopolymerization reactor, so that a propylene homopolymer with a high melt flow rate is obtained at lower hydrogen concentration;(2) a second external electron donor which contributes to the improvement of the isotacticity of polypropylene is added into a second-stage loop reactor, so that high-crystallized polypropylene is prepared in the stage to enable a material to obtain excellent rigidity; and (3) a third external electron donor is sprayed on the surface of the polymer generated in the second stage, so that the thirdexternal electron donor enters a gas phase reactor of the third stage along with the polymer, so that an impact resistant propylene polymer with uniform sequence distribution and high content is obtained in the stage.

Description

technical field [0001] The invention relates to a method for preparing high-impact polypropylene, in particular to a method for preparing high-impact polypropylene with high melt flow rate. Background technique [0002] High-impact polypropylene resin with high melt flow rate (high flow) is widely used in the field of injection molding due to its higher processing and molding efficiency than ordinary impact copolymers, and its market profit is also significantly higher than that of ordinary anti-impact copolymers. Punch copolymer. At present, the methods for preparing high-flow and high-impact polypropylene resins are mainly divided into two categories: post-processing modification and direct polymerization in a kettle. Post-processing modification refers to the chain scission treatment of the prepared impact polypropylene resin during melt processing to reduce its molecular weight or widen its molecular weight distribution, so as to achieve the purpose of increasing the me...

Claims

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Application Information

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IPC IPC(8): C08F210/06C08F110/06C08F210/16C08F2/02C08F2/34C08F4/646C08F4/649
CPCC08F110/06C08F210/06C08F210/16C08F2/02C08F2/34C08F4/6465C08F4/6494
Inventor 刘小燕陈旭朱博超王福善侯景涛巩红光宋赛楠邓守军刘强徐人威赵东波
Owner PETROCHINA CO LTD
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