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A kind of polypropylene preparation method for preparing high chlorination rate chlorinated polypropylene

A technology of chlorinated polypropylene and polypropylene, which is applied in the field of polypropylene preparation, can solve the problems of inappropriate product particle size and distribution, high crystallinity of polypropylene, etc., and achieve adjustable crystallinity, increased chlorine content, and good particle shape Effect

Active Publication Date: 2011-12-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing high chlorination rate polypropylene for domestic and foreign slurry process polypropylene isotacticity, high crystallinity, product particle size and its distribution are not suitable, can not meet some specific needs of the product. Polypropylene preparation method of chlorinated polypropylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Under the protection of nitrogen, add 1000ml hexane in the 2L autoclave that is equipped with mechanical stirring, add 7mmol triethylaluminum Al(C 2 h 5 ) 3 , 0.2 g solid N-type catalyst and 50 μl cyclohexylmethyldimethoxysilane, 50 μl 2,2,6,6-tetramethylpyridine. A propylene / hydrogen mixed gas with a pressure of 0.8 MPa was introduced, wherein the hydrogen partial pressure was 0.06 MPa. After 120 minutes of polymerization, the high-pressure reactor was cooled and depressurized, and discharged after replacement. After filtering and drying, 290 grams of polypropylene were obtained, and the bulk density of polypropylene was 0.42g / cm 3 , the melt index is 33.6g / 10min (230°C, 2.16kg), and the isotacticity is 92.8%. The crystallinity of polypropylene detected by DSC was 50.29%. The chlorination degree of chlorinated polypropylene obtained by the aqueous phase chlorination method of polypropylene is 70%.

Embodiment 2

[0021] Under the protection of nitrogen, add 1000ml hexane in the 2L autoclave that is equipped with mechanical stirring, add 7mmol triethylaluminum Al(C 2 h 5 ) 3 , 0.2 g of CS-1 solid catalyst, 50 μl of cyclohexylmethyldimethoxysilane, and 150 μl of 2,2,6,6-tetramethylpyridine. A propylene / hydrogen mixed gas with a pressure of 0.8 MPa was introduced, wherein the hydrogen partial pressure was 0.04 MPa, and the polymerization reaction started. After 120 minutes of polymerization, lower the temperature and pressure of the autoclave, and discharge after replacement. After filtering and drying, 220 grams of polypropylene were obtained, and the bulk density of polypropylene was 0.40g / cm 3 , the melt index is 26.8g / 10min (230°C, 2.16kg), and the isotacticity is 95.6%. The crystallinity of polypropylene detected by DSC was 50.29%. The degree of chlorination of chlorinated polypropylene obtained by the aqueous phase chlorination method of polypropylene is 60%.

Embodiment 3

[0023] Under the protection of nitrogen, add 1000ml hexane to the 2L autoclave equipped with mechanical stirring, add 10mmol triethylaluminum Al(C 2 h 5 ) 3 , 0.2 grams of N-type solid catalyst, 50 μl of diphenyldimethoxysilane, 50 μl of 2,2,6,6-tetramethylpyridine, and a propylene / hydrogen gas mixture with a pressure of 0.8 MPa, wherein the hydrogen partial pressure is 0.06MPa, after 120 minutes of polymerization, lower the temperature and pressure of the autoclave, and discharge after replacement. After filtering and drying, 300 grams of polypropylene were obtained, and the bulk density of polypropylene was 0.42g / cm 3 , the melt index is 35.5g / 10min (230°C, 2.16kg), and the isotacticity is 92.8%. The crystallinity of polypropylene detected by DSC was 50.29%. The chlorination degree of chlorinated polypropylene obtained by the aqueous phase chlorination method of polypropylene is 65%.

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Abstract

The present invention relates to a polypropylene preparation method for preparing chlorinated polypropylene with high chlorination rate; adding 3-20mmol alkyl aluminum hexane solution to 1000ml linear saturated alkane or linear saturated alkane mixture; adding 0.1- 0.5g catalyst / ml linear saturated alkanes or linear saturated alkanes mixture; 10-150μl orthosilicate compound / g catalyst, 10-150μl nitrogen-containing heterocyclic compound / g catalyst, feed propylene / hydrogen mixed gas; The catalyst is Ziegler-Natta catalyst; the linear saturated alkane is hexane or octane; the linear saturated alkane mixture is a mixture of nonane and decane; the nitrogen-containing heterocyclic compound is 2,2,6,6-tetramethyl Pyridine: The melt index of the polypropylene is 20-50g / 10min, the isotacticity is 91-95%, the crystallinity is 40-54%, and the bulk density is greater than 0.38g / cm3.

Description

Technical field: [0001] The invention relates to a polypropylene preparation method for preparing high chlorination rate chlorinated polypropylene. Background technique: [0002] As an important synthetic resin, polypropylene is widely used. The different properties of polypropylene determine its use. At present, due to the requirements of the polymerization process, the polypropylene prepared by the slurry method generally has a high isotacticity (above 97%), a high degree of crystallinity (above 60%), and the melting index of industrial powder products is difficult to determine. to very high (higher than 20g / 10min). Unable to meet the needs of some specific purposes. For example, it is used in the production of chlorinated polypropylene by the aqueous phase suspension chlorination method. The aqueous phase suspension chlorination method requires polypropylene to have both uniform powder, relatively low isotacticity and crystallinity, and a high melt index at the same ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F4/649C08F8/20
Inventor 张利仁史君张元礼王健姜明财刘志军孙辉宇焦金华徐丽艳崔勇崔月吕洁
Owner PETROCHINA CO LTD
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