Preparation method of high-impact-strength polypropylene kettle internal alloy

A technology of high-impact polypropylene and alloys in kettles, which is applied in the field of preparation of alloys in high-impact polypropylene kettles, can solve problems such as reduced rigidity, and achieve improved rigidity-toughness balance characteristics, good fluidity, and not easy to stick to kettles Effect

Active Publication Date: 2014-02-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing a high-impact polypropylene alloy in a kettle, which can overcome the defect that the rigidity of the polypropylene alloy decreases. Under the existing production equipment and process conditions, by changing the promoter and the external electron donor, the Improve the rigidity / toughness balance of polypropylene resin and achieve continuous and stable production of alloys in polypropylene kettles

Method used

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  • Preparation method of high-impact-strength polypropylene kettle internal alloy

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Experimental program
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Effect test

Embodiment 1

[0035] The reactor for preparing the high-impact polypropylene inner alloy is a steel pressure-resistant reactor with a mechanical stirring device and a temperature control jacket, and the volume of the reactor is 0.8L. There are gaseous monomer feed ports and valves on the bottom and cover of the reactor, and catalyst feed ports, pressure gauges and exhaust lines with pressure controllers are also located on the cover.

[0036] Before the reaction, the temperature of the kettle was raised to 100°C, and the kettle was evacuated for 2 hours through the catalyst feed port to remove moisture and air in the kettle, and then the temperature of the kettle was lowered to 20-50°C, and the stirring speed was adjusted to 300 rpm. Fill the polymerization grade propylene to 0.1~0.2MPa (absolute pressure, the following are absolute pressure) through the gaseous monomer feed port of the kettle cover, and add 100mL n-heptane and cocatalyst Al(C 2 h 5 ) 3 (2M n-heptane solution), external e...

Embodiment 2

[0041] In embodiment 2, the main catalyst consumption is 67.5 mg, before the copolymerization stage starts, the cocatalyst Al ( i -C 4 h 9 ) 3 with Al(C 2 h 5 ) 3 The molar ratio of dicyclopentyldimethoxysilane to diphenyldimethoxysilane is 0.43:1, and the rest of the operating procedures and polymerization conditions are the same as in Example 1. The catalytic efficiency of the polymerization reaction was 1.93 kg polymer / g catalyst. The polymerization product is a free-flowing fine powder particle, wherein the content of ethylene-propylene random copolymer is 17.0% (wt). The mechanical properties test results of the polymer products are listed in Table 1.

[0042]

Embodiment 3

[0044] In embodiment 3, the amount of main catalyst is 58.7 mg, before the copolymerization stage starts, add co-catalyst Al ( i -C 4 h 9 ) 3 , Al( i -C 4 h 9 ) 3 with Al(C 2 h 5 ) 3The mol ratio is 0.25:1, and all the other operating procedures and polymerization conditions are the same as in Example 1. The catalytic efficiency of the polymerization reaction was 2.33 kg polymer / g catalyst. The polymerization product is a free-flowing fine powder particle, wherein the content of ethylene-propylene random copolymer is 16.0% (wt). The mechanical properties test results of the polymer products are listed in Table 1.

[0045]

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Abstract

The invention discloses a preparation method of a high-impact-strength polypropylene kettle internal alloy. The preparation method comprises the following steps: with propylene and ethylene as monomers, carrying out sectional polymerization, namely, firstly, carrying out propylene homopolymerization by using a MgCl2/ID/TiCl4-supported catalyst as a primary catalyst, using Al(C2H5)3 as a cocatalyst and using R2R2Si(OCH3)2 as an external electron donor; after the homopolymerization is ended, adding another cocatalyst Al(i-C4H9)3 or another different external electron donor R3R4Si (OCH3)2 into a polymerization system to carry out ethylene-propylene copolymerization to prepare the high-impact-strength polypropylene kettle internal alloy. The prepared high-impact-strength polypropylene kettle internal alloy has excellent rigidity/toughness equilibrium characteristic; under the same condition, compared with normal conventional catalytic system only using Al(C2H5)3 and R1R2Si (OCH3)2, The preparation method has the advantages that the impact strength of the high-impact-strength polypropylene kettle internal alloy prepared by the method disclosed by the invention is higher than that of the conventional catalytic system while bending modulus is lowered a little; meanwhile, the prepared polypropylene kettle internal alloy particles have better mobility and are not easily adhered onto the kettle.

Description

technical field [0001] The invention relates to a preparation method of polypropylene resin, in particular to a preparation method of high-impact polypropylene inner alloy. Background technique [0002] High-impact polypropylene tank alloys (polypropylene impact copolymers) are a class of high-performance polypropylene resins with a wide range of uses, with significantly higher toughness than conventional homopolypropylene resins. This kind of resin is usually prepared by a two-stage polymerization method with two tanks connected in series, that is, the liquid phase bulk polymerization of propylene is carried out in the first reactor, and then the material in the first reactor is removed from the propylene monomer and then transferred to the second reactor Internal ethylene-propylene gas phase copolymerization. The polypropylene resin obtained through this two-stage polymerization reaction is a multi-phase polymer material composed of a continuous phase of polypropylene and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/16C08F110/06C08F210/16C08F4/649
CPCC08F110/06C08F210/16C08L23/12C08L23/14C08F4/6494
Inventor 屠嵩涛范志强笪文忠徐宏彬傅智盛
Owner CHINA PETROLEUM & CHEM CORP
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