Preparation method of high-flow impact-resistant polypropylene material

A polypropylene material and high fluidity technology, applied in the field of polypropylene material preparation, can solve problems such as conversion difficulties, and achieve the effects of reducing production costs, good rigidity and high fluidity

Inactive Publication Date: 2018-12-07
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to switch between PP grades in the hydrogen modulation method, and different catalysts need to be replaced

Method used

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  • Preparation method of high-flow impact-resistant polypropylene material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1). Under the joint action of the main catalyst, co-catalyst and external electron donor, propylene is polymerized into polypropylene through the pre-polymerization reactor, and the ratio of antistatic agent to co-catalyst is controlled to 0.43.

[0042] (2). The pre-polymerization reaction product obtained by step (1) enters the first loop reactor with fresh propylene and hydrogen to continue the polymerization reaction. The hydrogen concentration of the first loop tube is controlled to be 1380ppm, the reaction temperature is 70°C, and the reaction pressure 3.4MPa, ring pipe density 545kg / m 3 .

[0043] (3) The polymerization reaction product obtained by step (2) enters the second loop reactor with fresh propylene and hydrogen to continue polymerization, and the hydrogen concentration of the second loop is controlled to be 1450ppm, the reaction temperature is 70°C, and the reaction pressure is 3.4MPa , ring pipe density 590kg / m 3 .

[0044] (4) The polymerization r...

Embodiment 2

[0047] (1). Under the joint action of the main catalyst, co-catalyst and external electron donor, propylene is polymerized into polypropylene through the pre-polymerization reactor, and the ratio of antistatic agent and co-catalyst is controlled to 0.45.

[0048] (2). The pre-polymerization reaction product obtained by step (1) enters the first loop reactor with fresh propylene and hydrogen to continue the polymerization reaction. The hydrogen concentration of the first loop is controlled to be 1500ppm, the reaction temperature is 70°C, and the reaction pressure 3.4MPa, ring pipe density 550kg / m 3 .

[0049] (3) The polymerization reaction product obtained by step (2) enters the second loop reactor with fresh propylene and hydrogen to continue polymerization, and the hydrogen concentration of the second loop is controlled to be 1500ppm, the reaction temperature is 70°C, and the reaction pressure is 3.4MPa , ring pipe density 585kg / m 3 .

[0050] (4) The polymerization react...

Embodiment 3

[0053] (1). Under the combined action of the main catalyst, co-catalyst and external electron donor, propylene is polymerized into polypropylene through the pre-polymerization reactor, and the ratio of antistatic agent to co-catalyst is controlled to 0.44.

[0054] (2). The pre-polymerization reaction product obtained by step (1) enters the first loop reactor with fresh propylene and hydrogen to continue the polymerization reaction. The hydrogen concentration of the first loop is controlled to be 1650ppm, the reaction temperature is 70°C, and the reaction pressure 3.4MPa, ring pipe density 550kg / m 3 .

[0055] (3) The polymerization reaction product obtained by step (2) enters the second loop reactor with fresh propylene and hydrogen to continue polymerization, the hydrogen concentration of the second loop is controlled to be 1550ppm, the reaction temperature is 70°C, and the reaction pressure is 3.4MPa , ring pipe density 595kg / m 3 .

[0056] (4) The polymerization reactio...

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Abstract

The invention discloses a preparation method of a high-flow impact-resistant polypropylene material. The preparation method comprises: (1) polymerizing propylene through a prepolymerization reactor under the action of a main catalyst, a cocatalyst and an external electron donor, (2) feeding the polypropylene, fresh propylene and hydrogen into a first loop reactor and carrying out polymerization, (3) feeding the polymerization product and fresh propylene and hydrogen into a second loop reactor and carrying out polymerization, (4) carrying out flash evaporation on the polymerization product to remove a liquid phase propylene, feeding the polymerization product into a gas phase reactor and carrying out a reaction process to obtain polypropylene powder, and (5) uniformly mixing the polypropylene powder, an antioxidant, an auxiliary antioxidant, a halogen absorbent, a lubricant and a nucleating agent, and carrying out peroxide degradation extrusion through an extruder to obtain a polypropylene material. The polypropylene material has good flow properties and impact resistance and is suitable for injection molding of large thin-walled products.

Description

technical field [0001] The invention relates to a preparation method of a polypropylene material, in particular to a preparation method of a high-fluidity impact-resistant polypropylene material. technical background [0002] With the improvement of the process and the development and application of new catalysts (especially metallocene catalysts), new PP varieties have appeared on the market. Compared with traditional PP, their advantages in impact resistance, rigidity, transparency, gloss, barrier properties, etc. not only play a role in traditional PP application fields, but also penetrate into other application fields. At present, the development of new PP products mainly includes high melt strength, high transparency, high crystallinity, high flow PP, etc. These products are widely used in packaging, automobiles, home appliances and construction industries. Among them, high-flow copolymerized PP is widely used in home appliances, automobiles, thin-walled containers and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/103C08K5/098C08K5/134C08K5/526C08K5/14C08F110/06
CPCC08F110/06C08K5/098C08K5/103C08K5/1345C08K5/14C08K5/526
Inventor 蒋文军刘振宇梁胜彪李禄建许敏彭叶谭捷
Owner CHINA PETROLEUM & CHEM CORP
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