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Hydroxy terminated polypropylene and its preparing method

A technology of hydroxyl-terminated polypropylene and polypropylene, which is applied in the field of hydroxyl-terminated polypropylene and its preparation, can solve the problems of complex steps, decreased catalytic polymerization efficiency, and unsuitability for large-scale production and preparation.

Inactive Publication Date: 2006-06-07
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chain transfer agent used in this method usually needs to be specially synthesized, and the addition of the chain transfer agent also reduces the catalytic polymerization efficiency.
In addition, the end-functionalized polyolefins prepared by this method all have low molecular weight
Both of the above two types of methods need to process the polymer after olefin polymerization, and the polymer needs to be separated and purified twice. The steps are relatively complicated, so it is not suitable for large-scale production and preparation.

Method used

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  • Hydroxy terminated polypropylene and its preparing method
  • Hydroxy terminated polypropylene and its preparing method
  • Hydroxy terminated polypropylene and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Catalyst: Dimethylsilyl bis(2-methyl-4-naphthyl-indenyl)zirconium dichloride

[0074] Cocatalyst: Methylalumoxane

[0075] Under an argon atmosphere, add 50mL of toluene and 1.8mL of 1.4mol / L methylaluminoxane cocatalyst into the polymerization reactor, and stir at 30°C for 10 minutes; then replace the argon with propylene gas three times, and keep the propylene gas The pressure is 0.1Mpa; then at 30°C, add 2.5×10 -6 The metallocene catalyst of mol, the mol ratio=1000:1 of methylaluminoxane cocatalyst and metallocene catalyst, 30 ℃ of stirring 30 minutes, propylene gas pressure is kept on 0.1Mpa in the polymerization process; The product was oxidized with oxygen for 2 hours, then added 6mL of 30% hydrogen peroxide and 20mL of 0.1g / mL sodium hydroxide aqueous solution, and carried out hydrolysis reaction at 50°C for 4 hours; then the reaction product was precipitated with excess 10wt% hydrochloric acid ethanol, filtered A white solid was obtained, which was thoroughly ...

Embodiment 2

[0077] Catalyst: Dimethylsilyl bis(2-methyl-4-naphthyl-indenyl)zirconium dichloride

[0078] Cocatalyst: Methylalumoxane

[0079] Under an argon atmosphere, add 50mL of toluene and 3.6mL of 1.4mol / L methylaluminoxane cocatalyst into the polymerization reactor, and stir at 30°C for 10 minutes; then replace the argon with propylene gas three times, and keep the propylene gas The pressure is 0.1Mpa; then at 30°C, add 2.5×10 -6 The metallocene catalyst of mol, the mol ratio=2000:1 of methylaluminoxane cocatalyst and metallocene catalyst, 30 ℃ of lower stirring 30 minutes, propylene gas pressure kept on 0.1Mpa in the polymerization process; The product was oxidized with oxygen for 2 hours, then 12mL of 30% hydrogen peroxide and 20mL of 0.2g / mL sodium hydroxide aqueous solution were added, and the hydrolysis reaction was carried out at 50°C for 4 hours; then the reaction product was precipitated with excess 10wt% hydrochloric acid ethanol, filtered A white solid was obtained, whic...

Embodiment 3

[0081] Catalyst: Dimethylsilyl bis(2-methyl-4-naphthyl-indenyl) zirconium dichloride Cocatalyst: Methylalumoxane

[0082] Under an argon atmosphere, add 50mL of toluene and 5.4mL of 1.4mol / L methylaluminoxane cocatalyst into the polymerization reactor, and stir at 30°C for 20 minutes; then replace the argon with propylene gas three times, and keep the propylene gas The pressure is 0.1Mpa; then at 30°C, add 2.5×10 -6 The metallocene catalyst of mol, the mol ratio=3000:1 of methylaluminoxane cocatalyst and metallocene catalyst, 30 ℃ of stirring 30 minutes, propylene gas pressure is kept on 0.1Mpa in the polymerization process; The product was oxidized with oxygen for 2 hours, then 18mL of 30% hydrogen peroxide and 30mL of 0.2g / mL sodium hydroxide aqueous solution were added, and the hydrolysis reaction was carried out at 50°C for 8 hours; then the reaction product was precipitated with excess 10wt% hydrochloric acid ethanol, filtered A white solid was obtained, which was thorou...

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Abstract

The present invention relates to hydroxy terminated polypropylene in the structure as shown and its preparation process. The catalyst system comprising metallocene and alkyl aluminoxane catalyzes propylene polymerization reaction, dry air or oxygen is then introduced into the reacted system, and hydrogen perosxide and alkali hydroxide aqua are finally added for treating to obtain polypropylene with one hydroxy radical in one end of the macro molecular chain. The polymer of the present invention has high terminated hydroxy function degree not lower than 0.8, high isotactic configuration, high adjustable molecular weight, narrow molecular weight distribution, simple preparation process, and other advantages.

Description

technical field [0001] The invention relates to a hydroxyl-terminated polypropylene and a preparation method thereof. Background technique [0002] Polyolefins are the most widely used general-purpose plastics. However, since the polyolefin macromolecular chain does not have any polar groups, its adhesiveness, printing and dyeing properties, and compatibility with other materials are poor, thus limiting the application range of polyolefins. [0003] Existing polyolefin functional modification methods include free radical grafting (Tao Siping, China Plastics. 2002, 16 (5): 1; Wan Weitao, etc., New Chemical Materials. 2003, 31 (8): 11), cross-linking (Shu Wenyi, Plastics. 1992, 21(5): 29; Shen Jingshu et al., Polymer Bulletin. 1992, 3: 170), plasma treatment (Zhang Lihui, etc., Plastics Industry. 2003, 31(6 ): 17), etc., but these methods cannot accurately control the structure of the product, and there are many side reactions that lead to changes in the polyolefin structure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F4/602C08F8/06
Inventor 董金勇范国强韩志超
Owner INST OF CHEM CHINESE ACAD OF SCI
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