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Isotatic polypropylene with functionalized terminal hydroxyl group and preparation method of isotatic polypropylene

An isotactic polypropylene and functionalized technology, applied in the field of regular polypropylene, can solve the problems of unfavorable use of terminal hydroxyl reaction, high molecular weight of polypropylene, large amount of MAO, etc., and achieve high reactivity and high terminal hydroxyl end capping rate. , the preparation method is simple

Inactive Publication Date: 2013-07-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of MAO in the catalytic system is very large, resulting in high production costs, which limits its promotion to a certain extent
In addition, the polypropylene prepared by this method has a high molecular weight, which is not conducive to the use of terminal hydroxyl groups for subsequent reactions.

Method used

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  • Isotatic polypropylene with functionalized terminal hydroxyl group and preparation method of isotatic polypropylene
  • Isotatic polypropylene with functionalized terminal hydroxyl group and preparation method of isotatic polypropylene
  • Isotatic polypropylene with functionalized terminal hydroxyl group and preparation method of isotatic polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Catalyst: TiCl 4 / MgCl 2

[0039] Cocatalyst: Triethylaluminum

[0040] Chain transfer agent: diethyl zinc

[0041] External electron donor: cyclohexylmethyldimethoxysilane

[0042] Solvent: Toluene

[0043] Under anhydrous and oxygen-free conditions, 50mL of solvent, cocatalyst triethylaluminum (Al:Ti=60:1, molar ratio), external electron donor cyclohexylmethyldimethoxysilane (Si:Ti= 5:1, molar ratio) and chain transfer agent diethylzinc (Zn:Ti=3:1, molar ratio) were added to the Schlenk bottle, and finally 40 mg of the main catalyst was added, and propylene with a pressure of 0.1 MPa was introduced to polymerize The temperature is 60°C, and the polymerization time is 0.5h. After the polymerization is completed, dry oxygen is introduced for oxidation, and the reaction is carried out at 100°C for 0.5h. Then add 5 mL of 1mol / L hydrochloric acid aqueous solution to quench and deactivate the catalyst. After stirring for 5 min, stand to separate the liquid with a sepa...

Embodiment 2

[0045] Other experimental conditions are the same as in Example 1, Zn:Ti=5 (molar ratio). 3.16 g of isotactic polypropylene having a hydroxyl group at one end was obtained. The number average molecular weight of the polymer is 16.3×10 3 mol / g, the molecular weight distribution index is 7.7, the melting point is 159.6°C, and the hydroxyl end capping ratio is 0.73.

Embodiment 3

[0047] Other experimental conditions are the same as in Example 1, Zn:Ti=10 (molar ratio). 2.15 g of isotactic polypropylene having a hydroxyl group at one end were obtained. The number average molecular weight of the polymer is 8.2×10 3 mol / g, the molecular weight distribution index is 7.0, the melting point is 157.5°C, and the terminal hydroxyl end-capping rate is 0.75.

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Abstract

The invention relates to isotactic polypropylene and aims at providing the isotatic polypropylene with a functionalized terminal hydroxyl group and a preparation method of isotatic polypropylene. The preparation method comprises the following steps of: adding an organic solvent, aluminium alkyl serving as a promoter, an alkane external electron donor and an alkyl metal chain transfer agent to a Schlenk bottle under anhydrous and oxygen-free conditions, finally adding 40mg of main catalyst TiCl4 / MgCl2, and feeding propylene; oxidizing a polymerization product by dry oxygen, quenching by a hydrochloric acid aqueous solution to inactivate the catalyst, stirring for 5 minutes, standing and skimming by a separating funnel, and removing upper-layer clear liquid and middle-layer clear liquid; and removing the solvent in a solid product, repeatedly washing by distilled water and the organic solvent and carrying out vacuum drying, thus obtaining the isotactic polypropylene, one end of which is the hydroxyl group. The chain transfer agent used in the invention does not need to be specially synthesized and can be added together with the main catalyst, and the polymerization activity of the main catalyst is not reduced; and the main catalyst is the industrially common TiCl4 / MgC12 catalyst rather than metallocene, and industrialization is easy to realize.

Description

technical field [0001] The invention relates to isotactic polypropylene, in particular to a hydroxyl-terminated functionalized isotactic polypropylene and a preparation method thereof. Background technique [0002] Polypropylene has been widely used in packaging, automobile, construction, and military fields because of its good mechanical properties, stable thermal and chemical properties, good electrical insulation properties, and high cost performance. In 2010, the world's polypropylene demand reached 53,570kt, and the total production capacity reached 60,980kt / a. In the past two years, the global demand and production capacity of PP have maintained a rapid growth momentum. However, polypropylene is chemically inert, and the non-polar and crystalline characteristics of its molecular chain determine its low surface energy and hydrophobic characteristics. The extremely low surface energy leads to poor interfacial compatibility of polypropylene when it is blended with other ...

Claims

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Application Information

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IPC IPC(8): C08F110/06C08F2/38C08F4/646C08F8/06C08F8/12
CPCY02P20/52
Inventor 傅智盛叶亚楠范志强上官勇刚
Owner ZHEJIANG UNIV
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