Method for preparing long chain branching isotactic polypropylene

A technology of isotactic polypropylene and long-chain branching, which is applied in the field of tactic polypropylene and can solve the problems of reduced polymerization activity and low propylene intake

Inactive Publication Date: 2012-07-04
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Weiqing Weng reported the use of a catalyst to synthesize long-chain branched polypropylene, but it requires extremely low propylene intake, which will greatly reduce the polymerization activity (U.S. Patent 6,342,574)

Method used

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  • Method for preparing long chain branching isotactic polypropylene
  • Method for preparing long chain branching isotactic polypropylene
  • Method for preparing long chain branching isotactic polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] Embodiment 1, preparation long chain branched isotactic polypropylene

[0118] In a 500ml stainless steel kettle equipped with a mechanical stirrer, replace with nitrogen and propylene respectively, then add 150ml of toluene and 0.71ml of toluene solution (Al / Zr = 1000), control the temperature at 50°C, add 1 μmol catalyst rac-CH 2 (3-t-Bu-1-Ind) 2 ZrCl 2 (Organometallics 2000, 19, 420-429) (catalyst 1), add 0.71ml concentration of 1.4mol / l MAO toluene solution (Al / Zr=1000) and 1μmol catalyst rac-Me after reacting at 0.1MPa pressure for 10min 2 Si(2-Me-4-Ph-Ind) 2 ZrCl 2 (Organometallics 1994,13,954-963) (catalyst 2), react 20min under 0.1MPa pressure, be that the ethanol solution of 5% (volume ratio) hydrochloric acid terminates reaction with concentration at last, obtain long-chain branched polymer through washing, drying. propylene.

[0119] The rheological curve of the prepared long-chain branched isotactic polypropylene (see figure 1 ). The melting point of...

Embodiment 2

[0120] Embodiment 2, preparation long chain branched isotactic polypropylene

[0121] Replace with nitrogen and propylene respectively in a 500ml stainless steel kettle equipped with a mechanical stirrer, then add 150ml of toluene and 0.36ml of toluene solution (Al / Zr = 1.4mol / l MAO through metal sodium reflux dehydration 1000), control the temperature at 50°C, add 0.5μmol catalyst rac-CH 2 (3-t-Bu-1-Ind) 2 ZrCl 2 (Catalyst 1), add 0.71ml concentration to be the MAO toluene solution (Al / Zr=1000) of 1.4mol / l after reacting 10min under 0.1MPa pressure and 1μmol catalyst rac-Me 2 Si(2-Me-4-Ph-Ind) 2 ZrCl 2 (Catalyst 2), reacted under 0.1MPa pressure for 20min, and finally terminated the reaction with ethanol solution of 5% (volume ratio) hydrochloric acid, washed and dried to obtain long-chain branched polypropylene.

[0122] The rheological curve of the prepared long-chain branched isotactic polypropylene is shown in figure 1 . The results of the measured melting point an...

Embodiment 3

[0125] Embodiment 3, preparation long chain branched isotactic polypropylene

[0126] A 500ml stainless steel kettle equipped with a mechanical stirrer was replaced with nitrogen and propylene respectively, and then 150ml of toluene and 0.43ml concentration of 1.4mol / l MAO toluene solution (Al / Zr=3000 ), control the temperature at 50℃, add 0.2μmol catalyst rac-CH 2 (3-t-Bu-1-Ind) 2 ZrCl 2 (Catalyst 1), add 3.9ml concentration is 1.4mol / l MAO toluene solution (Al / Zr=3000) and 1.8μmol catalyst rac-Me after reacting 10min under 0.1MPa pressure 2 Si(2-Me-4-Ph-Ind) 2 ZrCl 2 (Catalyst 2), reacted under 0.1MPa pressure for 20min, and finally terminated the reaction with ethanol solution of 5% (volume ratio) hydrochloric acid, washed and dried to obtain long-chain branched polypropylene.

[0127] The rheological curve of the prepared long-chain branched isotactic polypropylene is shown in figure 1 . The results of the measured melting point and intrinsic viscosity of the polyme...

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Abstract

The invention discloses a method for preparing a long chain branching isotactic polypropylene. In the method, the long chain branching isotactic polypropylene is prepared by a polymerization reaction in solution and by using propylene as a monomer, and a compounded catalyst system comprising more than two types of single-activity center catalysts having high-degree stereospecific capacity and co-catalysts (alkyl-aluminoxane, alkyl aluminum or boron salts). Without other auxiliary agents, the method is simple and feasible, and the obtained product is pure. The degree of branching and the molecular weight of the obtained product can be adjusted according to the polymerization time, the polymerization temperature and the ratio of the two types of the single-activity center catalysts in the preparation process. The prepared long chain branching isotactic polypropylene has obvious shear thinning behaviors and improves the processability of a material.

Description

technical field [0001] The invention relates to a method for preparing long-chain branched isotactic polypropylene. Background technique [0002] Isotactic polypropylene is one of the most widely used and fastest growing resins in the world. Compared with other thermoplastic resins, it has the characteristics of low density, high melting point, wide source, low price, superior mechanical properties, and good chemical stability. In recent years, polypropylene has developed into packaging, light industry, construction, electronics, electrical appliances, One of the indispensable basic raw materials for industries such as automobiles. [0003] However, ordinary commercial polypropylene has a linear structure, which leads to a polymer whose softening point is very close to the melting point and has a short melting range. In thermoforming processing, the performance is: when the temperature is higher than the melting point, the viscosity of the melt drops sharply, and the strai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F2/06C08F4/6592
Inventor 董金勇温笑菁牛慧黄英娟
Owner INST OF CHEM CHINESE ACAD OF SCI
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