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High-melt-strength polypropylene composition and preparation method thereof

A polypropylene composition and high melt strength technology, applied in the field of plastic processing, can solve problems such as difficulty in controlling the degree of crosslinking, and achieve the effects of easy control, improved melt strength and low cost

Inactive Publication Date: 2014-12-24
GUANGZHOU SHUDE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding unsaturated second monomer, although the degradation of polypropylene is limited, it is easy to produce cross-linking to improve the melt strength, but the degree of cross-linking is difficult to control
Moreover, cross-linked polypropylene is easy to produce gel, which will cause a lot of problems in production during post-processing

Method used

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  • High-melt-strength polypropylene composition and preparation method thereof
  • High-melt-strength polypropylene composition and preparation method thereof
  • High-melt-strength polypropylene composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Raw material components: 100 parts by weight of polypropylene is copolymerized PP, produced by Qilu Petrochemical Company, the brand is SP179, MFR 9.0g / 10min; 4 parts by weight of EPDM rubber, of which ethylene content is 52%, Mooney viscosity is 45, Japan JSR Co., Ltd.; 0.06 parts by weight of the initiator is di-tert-butyl peroxide; 0.15 parts by weight of the antioxidant is tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, 0.3 0.05 parts by weight of lubricant is monoglyceryl stearate.

[0037] Preparation of high-melt strength polypropylene composition: In an internal mixer, mix all the above-mentioned components for 15 minutes, and ensure that the temperature is not higher than 160 degrees; It is easy to feed the extruder; then react, extrude and granulate in the twin-screw extruder to obtain the product. Control the speed of the twin-screw extruder to 300 rpm, and control the temperature of each section from the feeding port to th...

Embodiment 2

[0042] Raw material components: polypropylene is 100 parts of copolymerized PP, produced by Qilu Petrochemical Company, the brand is SP179, MFR 9.0g / 10min; EPDM rubber 6 parts, ethylene content 52%, Mooney viscosity 45, Japan JSR Corporation; The initiator is 0.08 parts of di-tert-butyl peroxide; the antioxidant is 0.15 parts of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, 0.3 parts of thiodipropylene dilaurate; the lubricant is 0.05 parts of monoglyceride stearate.

[0043] All the other operating modes are the same as in Example 1.

Embodiment 3

[0045] Raw material components: polypropylene is 100 parts of copolymerized PP, produced by Qilu Petrochemical Company, the brand is SP179, MFR 9.0g / 10min; EPDM rubber 8 parts, ethylene content 52%, Mooney viscosity 45, Japan JSR Corporation; The initiator is 0.1 part of di-tert-butyl peroxide; the antioxidant is 0.15 part of tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester, 0.3 part of thiodipropylene dilaurate; the lubricant is 0.05 parts of monoglyceride stearate.

[0046] All the other operating modes are the same as in Example 1.

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Abstract

The invention relates to a high-melt-strength polypropylene composition and a preparation method thereof. The high-melt-strength polypropylene composition comprises the following raw materials: polypropylene, an ethylene-propylene diene copolymer, an initiating agent, an antioxidant and a lubricating agent. The preparation method comprises the following steps: blending the polypropylene and the ethylene-propylene diene copolymer to form a rubber modified polypropylene blend, and forming micro-crosslinking between polypropylene and polypropylene, between polypropylene and rubber, and between the rubbers under the action of an organic super-oxidized initiating agent. The produced high-melt-strength polypropylene disclosed by the invention has the crosslinking degree of zero, and is high in melt strength and excellent in extrusion processing performance.

Description

technical field [0001] The invention belongs to the technical field of plastic processing, and in particular relates to a micro-crosslinked high-melt strength polypropylene and a preparation method thereof. Background technique [0002] The molecular chain of polypropylene (PP) is a linear straight chain structure, lacks long chain branches, and cannot produce secondary active centers, resulting in its low melt strength and poor sag resistance. In the molten state, polypropylene has no strain hardening effect , thus greatly limiting the scope of application of polypropylene. In addition, polypropylene is also a partially crystalline polymer, the softening point is very close to the melting point, and the melt strength drops rapidly after exceeding the melting point, resulting in uneven wall thickness of the container during thermoforming, and edge curling and shrinkage during extrusion coating and calendering , Cell collapse and other issues during extrusion foaming. The m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/14C08L23/16C08K5/14C08J3/24B29B7/22B29C47/92B29C48/92
CPCC08L23/14B29B7/22B29C48/92B29C2948/9258B29C2948/92704B29C2948/92904C08J3/246C08J2323/14C08J2423/16C08L2207/14C08L2312/00C08L23/16C08K5/14
Inventor 林汉杰
Owner GUANGZHOU SHUDE SCI & TECH