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A kind of production method of high-melt thin-wall injection molding compound

A production method and plastic injection technology, which is applied in the field of polypropylene production, can solve the problems of high production cost, and achieve the effects of reduced production cost, good processing performance and good product fluidity

Active Publication Date: 2019-04-16
联泓新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the production of homopolypropylene with a melt index higher than 25g / 10min uses Grace's fifth-generation catalyst Consista TM series, higher production costs

Method used

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  • A kind of production method of high-melt thin-wall injection molding compound

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Experimental program
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Effect test

Embodiment 1

[0033] The production method of the high-melt thin-walled injection molding compound comprises the following steps: (1) purification and supply of propylene raw materials; (2) propylene polymerization; (3) resin degassing; (4) tail gas recovery; (5) granulation; (6) air delivery and packing; described step (2) propylene polymerization reaction and step (5) granulation specific process conditions and parameters are as follows:

[0034] a. Reduce catalyst feed rate to 0.6kg / h;

[0035] b. Reduce the partial pressure of propylene in the reactor to 2.5MPa, and reduce the temperature of the reactor to 65°C;

[0036] c. After 30 minutes, add hydrogen into the reactor at an intake rate of 2kg / h. After the reaction is normal, continue to increase the amount of hydrogen added; in the process of increasing the partial pressure of hydrogen, increase the feed of fresh propylene or reduce the bed temperature to ensure that the bed Layer temperature and dew point temperature difference in ...

Embodiment 2

[0054] The production method of the high-melt thin-walled injection molding compound comprises the following steps: (1) purification and supply of propylene raw materials; (2) propylene polymerization; (3) resin degassing; (4) tail gas recovery; (5) granulation; (6) air delivery and packing; described step (2) propylene polymerization reaction and step (5) granulation specific process conditions and parameters are as follows:

[0055] a. Reduce catalyst feed rate to 0.6kg / h;

[0056] b. Reduce the partial pressure of propylene in the reactor to 2.7MPa, and reduce the temperature of the reactor to 70°C;

[0057]c. After 30 minutes, add hydrogen into the reactor at an intake rate of 2kg / h. After the reaction is normal, continue to increase the amount of hydrogen added; in the process of increasing the partial pressure of hydrogen, increase the feed of fresh propylene or reduce the bed temperature to ensure that the bed Layer temperature and dew point temperature difference in t...

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Abstract

The invention belongs to the technical field of polypropylene, and specifically relates to a production method of an injection molding material with a high melting point and thin wall. The production method comprises the following steps: (1) purifying and supplying a propylene raw material; (2) carrying out polymerization reactions of polypropylene; (3) degasifying resin; (4) recovering tail gas; (5) carrying out granulation; and (6) performing air conveying and packaging. The melting index of a product obtained by the production method is stable. The flowing property of the product is good. The processing property is good, and the rigidity is high. The product is good in transparency. The injection molding material does not have any undesirable odor and does not generate any static electricity. Compared with random thin-wall injection molding materials, the production cost is obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of polypropylene production, and in particular relates to a production method of high-melt thin-wall injection plastic. Background technique [0002] The annual consumption of high melt index polypropylene products in China is more than 300,000 tons. 70% of the products are used in the thin-wall injection molding market, 20% are used in the modified material market, and 10% are used in other household products. The market has grown very rapidly in the past few years, with an annual market growth rate of 15-20%. [0003] At present, special materials for thin-wall injection molding are mainly divided into two categories: homopolymer polypropylene and random copolymer polypropylene; the methods for controlling the melt index include hydrogen adjustment method and controlled rheology method; the production process types include ring pipe technology, Mitsui Oil & Chemical, INEOS Vapor Phase Process. [0004] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F2/34C08K5/134C08K5/526C08K5/098B29B9/06
CPCB29B9/06C08F110/06C08K5/098C08K5/1345C08K5/526C08F2/34C08F2500/18C08F2500/12
Inventor 刘沛义叶青张宪礼董世伟蒋兴迪
Owner 联泓新材料科技股份有限公司
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