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Polypropylene with high melt strength and preparation method thereof

A technology of high melt strength and polypropylene, applied in the field of plastics, can solve the problems of easy generation of cross-linked structure and high price, and achieve the effects of easy degradation, strong energy absorption capacity and excellent environmental friendliness

Inactive Publication Date: 2010-08-25
宋建学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the copolymer is expensive and prone to cross-linked structure

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Vacuumize the dry 250 ml three-necked flask, replace it with argon three times, and replace it with propylene twice. Heat the oil bath to the reaction temperature, add an appropriate amount of heptane, dimethoxydiphenylsilane, 1,4-divinylbenzene and the required amount of cocatalyst triethylaluminum, start stirring, and use a solenoid valve to control the system The pressure of propylene is maintained at 1.03×10 5 Pa, followed by the addition of the required amount of catalyst to start the polymerization of propylene. After 30 min, the propylene valve was closed, and the reaction was terminated with 10% hydrochloric acid ethanol solution. Wash with ethanol, filter, and vacuum-dry at 60°C until constant weight.

[0040] Raw material components: component (A) is 100 parts of homopolypropylene, produced by Daqing Petrochemical Company, the brand is T30S; component (B) is 5 parts of reactive polypropylene intermediate PP-co-DVB obtained by the above reaction; Component (...

Embodiment 2

[0045] Except that the number of parts of component B was changed to 10 parts, other composition and preparation process were the same as in Example 1, and the obtained product was marked as L2.

Embodiment 3

[0048] Except that the number of parts of component B was changed to 15 parts, other composition and preparation process were the same as in Example 1, and the obtained product was marked as L3.

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Abstract

The invention relates to a polypropylene with high melt strength, which contains a long branched chain structure, and a preparation method thereof. In the method, Ziegler-Natta catalyst is firstly used for synthesizing a reactive polypropylene intermediate the side chain of which contains styrene groups, then the intermediate is added into a free base reaction system, the polypropylene with high melt strength, which has clear structure and adjustable branching content, is prepared by the reactivity of double bond of styrene via reactive extrusion, and the polypropylene with high melt strength, which has different performance, can be prepared by adjusting the dosage of the reactive polypropylene intermediate. The polypropylene has unique tensile property and excellent heat resistance, thereby having wide application prospects and practical value, can be widely used in the fields of extrusion foaming, thermoforming, extrusion coating, film blowing and the like, especially shows large market and application prospects in the aspect of producing foam materials, and has broad development and utilization prospects.

Description

Technical field: [0001] The invention relates to a high-melt-strength polypropylene material containing a long-chain branched structure prepared from linear-structure polypropylene by a reactive extrusion method and a preparation method thereof, belonging to the technical field of plastics. Background technique: [0002] Although polypropylene is one of the fastest-growing thermoplastic resins, after entering the 21st century, the phenomenon of excess global polypropylene production capacity will gradually emerge, and brutal market competition will be inevitable, which forces global polypropylene manufacturers to produce products The structure has changed a lot, and it is developing towards diversification and function. The unique tensile properties and excellent heat resistance of high melt strength polypropylene make it have broad application prospects and practical value, and can be widely used in extrusion foaming, thermoforming, extrusion coating and blow molding Film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/00B29B9/06B29C47/92B29C48/405B29C48/92
CPCB29C48/04B29C48/405
Inventor 宋建学董金勇
Owner 宋建学
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