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Method for simultaneously improving impact strength and melt flowability of polypropylene copolymer

A technology for copolymerizing polypropylene and impact strength, which is applied in the fields of polyolefin processing and modification, can solve the problems of increasing production costs, large fluctuations in the performance of impact-resistant polypropylene products, and increasing production steps, so as to simplify the process and improve the impact strength. and melt flow, cost reduction effect

Active Publication Date: 2010-10-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned post-processing modification method needs to add rubber-like elastomers to improve the impact strength of polypropylene, and it is physically mixed. The performance of the obtained impact-resistant polypropylene product fluctuates greatly, which increases the production step of mixing and increases the production cost.

Method used

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  • Method for simultaneously improving impact strength and melt flowability of polypropylene copolymer
  • Method for simultaneously improving impact strength and melt flowability of polypropylene copolymer
  • Method for simultaneously improving impact strength and melt flowability of polypropylene copolymer

Examples

Experimental program
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Embodiment 1

[0029] 1. Preparation of propylene copolymer:

[0030] See attached figure 1 , DQ catalyst dry powder is formulated with a certain proportion of white oil and vaseline into a paste with uniform concentration, placed in the catalyst preparation tank (V-322), and the prepared catalyst paste is continuously sent into the prepolymerization tank with a syringe pump. In the reactor (R-330), the cocatalyst and the external electron donor are also metered and continuously injected into the R-330 by a micropump at the same time, and pre-polymerized in it, and the pre-polymerization conditions are 15° C. and 4.0 MPa.

[0031] The prepolymer from R-330 first enters the first loop reactor (R-340) and polymerizes at 70°C and 4.0MPa. The feed of R-340 is controlled to ensure that the average residence time of the catalyst in it is about After 1.1h, it enters the second loop reactor (R-350), and also polymerizes at 70°C and 4.0MPa, and the average residence time is controlled at about 0.9h....

Embodiment 2

[0037] 1, the preparation of propylene copolymer sees embodiment 1,

[0038] 2. Improve polypropylene impact strength and melt fluidity Operation: except that the concentration of TETD is changed to 500ppm, all the other are the same as embodiment 1. The results are shown in Table 1 and Table 2.

Embodiment 3

[0040] 1, the preparation of propylene copolymer sees embodiment 1,

[0041] 2. Improve polypropylene impact strength and melt fluidity Operation: except that the concentration of TETD is changed into 1000ppm, all the other are the same as embodiment 1. The results are shown in Table 1 and Table 2.

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Abstract

The invention relates to a method for simultaneously improving the impact strength and melt flowability of a polypropylene copolymer. In the method, no additional grafting and copolymerizing monomers are needed, and only ordinary hyperoxides sold in the market, such as 1,3-di-tert-butyl isopropyl benzene and the like, and tetraethylthiuramdisulfide are needed to modify the polypropylene copolymer. The method has the advantages of improving the impact strength and the melt flowability of the polypropylene copolymer by one step, obtaining the polypropylene with the impact strength and melt flowability relatively higher than those of unmodified impact-resistant polypropylene, greatly simplifying the process, reducing cost, and preparing the polypropylene with different melt indexes and different kinds of impact strength by adjusting the copolymerization monomer content, the melt index and the addition of the hyperoxides and thiuram of basic resins.

Description

technical field [0001] The invention relates to a polyolefin processing and modification method in petrochemical industry. Background technique [0002] The main factors affecting the impact strength of polypropylene are the molecular weight of the polymer, the molecular weight distribution and the type and content of comonomers in polypropylene. The main factors affecting the melt fluidity of polypropylene are the molecular weight and molecular weight distribution. At present, the methods used to improve the impact strength and melt fluidity of polypropylene mainly include: polymerization technology and post-processing modification. [0003] The way to improve the impact strength of polypropylene by polymerization technology is to prepare impact polypropylene with high comonomer content through the reactor. For example, it is mentioned in the patent 200480022246.3 of BASELL that the invention relates to a composition containing a propylene polymer with a wide molecular we...

Claims

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Application Information

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IPC IPC(8): C08L23/14C08K5/14C08K5/40
Inventor 魏文骏乔金樑宋文波于鲁强郭梅芳
Owner CHINA PETROLEUM & CHEM CORP