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Method of preparing random polypropylene elastomer and ethylenel/ propylene copolymer

A random polypropylene and random copolymer technology, which is applied in the field of random polypropylene elastomer and ethylene/propylene copolymer elastomer, can solve the problems of dark product color and low catalytic activity, and achieve high randomness Effect

Inactive Publication Date: 2006-01-11
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst system used in the industrial production of ethylene / propylene random copolymers is composed of vanadium compounds and alkylaluminum, and has low catalytic activity. The prepared copolymer contains more catalyst components, which makes the product darker.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a 1-liter autoclave heated and dried under vacuum, 0.62 g of methylaluminoxane (MAO) and 180 mL of n-heptane, which was refluxed and dried by sodium metal, were added successively. 5 CpTiCl 2 N[Si(CH 3 ) 3 ] 2 42μmol, propylene partial pressure 0.3MPa. Under stirring, polymerize at 40°C for 1 hour, and the catalytic activity is 1086 kg polypropylene / mol titanium. The obtained polypropylene molecular weight Mw is 33.3×10 4 , the glass transition temperature (Tg) measured by DSC was -8.8°C, and the ether-soluble fraction was 97.7%. The tensile strength of the polymer is 2.15MPa, the elongation at break is 1750%, and the permanent deformation is 140%.

Embodiment 2

[0021] According to the polymerization method of Example 1, except that the polymerization temperature is 0° C., other conditions are the same. The catalytic activity is 295kg polypropylene / mol titanium, and the obtained polypropylene molecular weight Mw is 60.2×10 4 , Ether soluble fraction 94.2%.

Embodiment 3

[0023] According to the polymerization method of Example 1, except that the polymerization temperature is 50° C., other conditions are the same. The catalytic activity is 933kg polypropylene / mol titanium, and the obtained polypropylene molecular weight Mw is 21.6×10 4 , Ether soluble fraction 98.9%.

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PUM

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Abstract

A process for preparing the atactic polypropylene elastomer and ethylene / propylene copolymer features that the catalyst composed of monocyclopentadienyl aminotitanium compound and polyaluminoxane is used for the polymerization of propylene or copolymerization of ethylene and propylene.

Description

technical field [0001] The invention relates to a method for preparing random polypropylene elastomer and ethylene / propylene copolymer elastomer by using a novel monocyclic dienyl amino titanium compound / MAO (methyl aluminoxane) catalytic system. Background technique [0002] The physical form and properties of polypropylene are mainly determined by the three-dimensional structure and molecular weight of its macromolecular chain. Both isotactic polypropylene and syndiotactic polypropylene are crystalline polymers with plastic properties. Atactic polypropylene depends on the size of the molecular weight and can appear as mucus (molecular weight Mw below 10 3 ), sticky soft solid (Mw about 10 4 ) and elastic solids (Mw greater than 10 5 ) and other forms. Atactic polypropylene with different molecular weights has great differences in properties and has different uses. [0003] Generally, the preparation of atactic polypropylene can be made with a so-called Ziegler-Natta c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/06C08F4/642
Inventor 伍青刘云海
Owner SUN YAT SEN UNIV