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Preparation method of beta crystalline form polypropylene resin

A technology of polypropylene resin and β-crystal form, which is applied in the field of preparation of β-crystal form polypropylene resin, can solve the problems of uneven dispersion, difficult dispersion of nucleating agent, large amount of nucleating agent added, etc., and achieve tensile yield strength Improvement, impact resistance improvement, heat resistance improvement effect

Active Publication Date: 2012-07-25
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a simple process and is widely used at present, but its disadvantage is that the amount of nucleating agent added is large, and the nucleating agent is not easily dispersed or dispersed unevenly

Method used

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  • Preparation method of beta crystalline form polypropylene resin
  • Preparation method of beta crystalline form polypropylene resin
  • Preparation method of beta crystalline form polypropylene resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～12

[0045] 1) The temperature of the 450ml slurry polymerization reactor is raised to a temperature of 50-90° C. and vacuum-dried, and the air and traces of water in the slurry polymerization reactor are replaced with nitrogen with a purity of 99.99%, and the temperature is lowered to Polymerization temperature;

[0046] 2) feed propylene gas into the slurry polymerization reactor of step 1), make the pressure in the slurry polymerization reactor rise to normal pressure, then use heptane or hexane to dry the The polypropylene β crystal nucleating agent is washed into the slurry polymerization reactor of step 1); then the triethylaluminum cocatalyst, the diphenyldimethoxysilane external electron donor and the MgCl 2 / ID / TiCl 4 The supported Ziegler-Natta catalyst is added into the slurry polymerization reactor and stirred;

[0047] Wherein, the adding amount of described dry polypropylene beta crystal form nucleating agent is shown in Table 1, triethylaluminum cocatalyst: MgCl 2...

Embodiment 13～19

[0056] The experiments of Examples 13-19 were carried out according to the test formulation in Table 3.

[0057] 1) Before the polymerization starts, purge the bulk polymerization reactor with high-purity nitrogen with a purity of 99.99%, and replace the air and traces of water in the bulk polymerization reactor with high-purity nitrogen to ensure that the bulk polymerization reactor is removed. air and traces of water;

[0058] 2) Based on the content of the beta crystal form nucleating agent in the polypropylene resin, add hydrogen and liquid propylene to the bulk polymerization reactor of step 1), wherein the liquid propylene is in the range of 0.7kg to 2.8kg, and the hydrogen is in the range of 100 Within the range of ~376mmol, stir at a speed of 300rpm / min;

[0059] 3) Add 314mg~3010mg β-crystal nucleating agent, 35.36~70.72mmol triethylaluminum cocatalyst, 0.884mmol~1.768mmol diphenyldimethoxysilane (external electron donor) to the body of step 2) In the feeder on the ...

Embodiment 20～25

[0065] The steps of bulk polymerization described in table 5 are:

[0066] 1) Before the polymerization starts, purge the bulk polymerization reactor with high-purity nitrogen with a purity of 99.99%, and replace the air and traces of water in the bulk polymerization reactor with high-purity nitrogen to ensure that the bulk polymerization reactor is removed. air and traces of water;

[0067] 2) The experiments of Examples 20 to 25 in Table 5 are based on the content of the β crystal nucleating agent in the polypropylene resin, and 0.7 kg of liquid propylene and 100 mmol of hydrogen are added to the bulk polymerization reactor of step 1), 790mg β crystal nucleating agent, 0.884mmol diphenyldimethoxysilane external electron donor, 35.36mmol triethylaluminum cocatalyst are joined in the feeder on the bulk polymerization reactor top of step 1); Use 0.05kg Liquid propylene flushes the external β crystal nucleating agent, diphenyldimethoxysilane external electron donor, and triethy...

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Abstract

The invention relates to a preparation method of a beta crystalline polypropylene resin. The method comprises: adding a dry polypropylene beta crystalline form nucleating agent into a bulk polymerization reaction kettle or a slurry polymerization reaction kettle loaded with propylene, utilizing the Ziegler-Natta catalyst system to catalyze propylene for its bulk polymerization or slurry polymerization, thus obtaining composite powder of polypropylene and the polypropylene beta crystalline form nucleating agent; subjecting the obtained composite powder directly to heating and melting treatment or extrusion pelletization by an extruder, thus obtaining the beta crystalline form polypropylene resin. The beta crystalline form polypropylene resin prepared by the method of the invention has obvious advantages in terms of impact resistance, flexural strength, flexural modulus, tensile yield strength and heat resistance, etc., and particularly, the substantial enhancement of the impact resistance can make the beta crystalline form polypropylene resin prepared in the kettle applied in high-end application fields such as automobiles, batteries and the like.

Description

technical field [0001] The invention relates to a preparation method of β crystal polypropylene resin. Background technique [0002] Polypropylene (PP) has the advantages of low price, light weight, good processing performance, and wide application range, and has become one of the most versatile and largest-output plastic materials. In recent years, with the introduction of the concept of low-carbon economy and the improvement of energy-saving awareness, the application field of materials based on polypropylene resin has gradually expanded. In particular, the rapid development of the automobile industry has made high-performance polypropylene materials more and more important. In the 1990s, industrially developed countries used an average of 100-130kg of plastic per car, which increased to 340kg in 2002, accounting for about 23% of the vehicle's mass. Among them, PP is the most used thermoplastic, and the annual consumption in North America alone reaches 280,000 tons. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F2/44C08F2/02C08F2/06C08F4/649C08F4/646B29B9/06
CPCY02P20/52
Inventor 牛慧董金勇秦亚伟徐剑锋易庆锋
Owner INST OF CHEM CHINESE ACAD OF SCI
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