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Polypropylene material with high melt strength and preparation method thereof

A technology of polypropylene material and high melt strength, which is applied in the field of polypropylene material and its preparation, can solve the problems of no obvious improvement in mechanical properties, unpleasant odor of products, etc., and achieve excellent mechanical properties, good mixing performance, long residence time long effect

Inactive Publication Date: 2017-12-26
山东昊智新型材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Institute of Chemistry, Chinese Academy of Sciences has used DCP to initiate unsaturated silane grafting to prepare HMSPP, but the gel can only be obtained under the condition of high DCP and silane content at the same time, and the chemically crosslinked product has an unpleasant odor, which limits application
[0005] Chinese patent CN1142514A reported that Beijing Research Institute of Chemical Industry and Peking University passed 60 Gamma ray radiation polypropylene produced by Co produces high melt strength polypropylene, which is characterized in that a certain amount of nucleating agent is added to polypropylene to overcome the degradation of polypropylene in the radiation crosslinking process existing in the prior art and under normal temperature Disadvantages of no significant improvement in mechanical properties
Radiation modification of polypropylene generally requires vacuum or nitrogen protection to reduce the oxidative degradation reaction during the radiation process, and the processing environment brings great obstacles to industrial production

Method used

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  • Polypropylene material with high melt strength and preparation method thereof
  • Polypropylene material with high melt strength and preparation method thereof
  • Polypropylene material with high melt strength and preparation method thereof

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Embodiment Construction

[0023] The present invention prepares high melt strength polypropylene material by following method:

[0024] (1) Get polypropylene resin, cross-linking agent, benzoyl peroxide paste, antioxidant; The mass content of benzoyl peroxide is 50-55%, and tetrakis{β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate}pentaerythritol ester can be used as an antioxidant.

[0025] (2) Add all components of polypropylene resin, benzoyl peroxide paste, and antioxidants to the high mixer in turn and mix at a speed of 450 rpm for 5 minutes, then add the crosslinking agent under the condition of not stopping the machine and not changing the speed. Mix for 10 minutes; during the mixing process, the temperature of the material in the high mixer is controlled at 40-60°C;

[0026] (3) The mixed material is extruded through a three-screw parallel rotating extruder, and the material undergoes cross-linking and grafting reactions during the extrusion process of the extruder to make a high-melt strength ...

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Abstract

The invention discloses a polypropylene material with high melt strength and a preparation method thereof. The polypropylene material with high melt strength is prepared from the following components in parts by weight through the manner of extrusion reaction grafting through an extruding machine: 100 parts of polypropylene, 1-4 parts of a cross-linking agent, 0.1-1 part of benzoyl peroxide paste and 0.1-1.5 parts of an antioxidant, wherein the fusion index of polypropylene is 6-15g / 10min and the mass percent of benzoyl peroxide in the benzoyl peroxide paste is 50%-55%. According to the preparation method for the polypropylene material with high melt strength disclosed by the invention, three screw rods are adopted for rotating the extruding machine in a homodromous parallel manner. The melt strength of the polypropylene material with high melt strength produced according to the invention is 1.5-15 times that of the main component polypropylene; the polypropylene material has high heat resistance, excellent strain-hardening effect and mechanical properties; the structure can be controlled according to the requirement; the polypropylene material can be widely applied to the fields of polypropylene foaming and thermal forming.

Description

technical field [0001] The invention relates to a polypropylene material and a preparation method thereof, in particular to a high-melt strength polypropylene material and a preparation method thereof. Background technique [0002] As one of the five general-purpose thermoplastic resins, polypropylene (PP) is not only rich in raw materials and low in price, but also has the characteristics of high melting point, excellent heat resistance, excellent mechanical properties and easy molding and processing. It is used in transportation (automotive interior decoration and bumper) , hard packaging (bottle caps, trays, turnover boxes, etc.), equipment and medical products (syringes, tool boxes, etc.), food fast food boxes, industrial and agricultural and daily necessities and other fields have been widely used. [0003] Since the softening point of ordinary polypropylene is close to the melting temperature, the melt strength (melt viscosity) of PP will drop sharply during processing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F222/20C08F222/14C08L51/06B29C47/92B29C48/92
CPCC08F255/02C08L51/06B29C48/92B29C2948/9258B29C2948/92704B29C2948/92514C08F222/103C08F222/104
Inventor 李喜军李喜亮李喜明其他发明人请求不公开姓名
Owner 山东昊智新型材料科技有限公司
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