Anti-impact polypropylene with high ethylene content and high fluidity and preparation method thereof

A technology with fluidity and high ethylene, which is applied in the field of impact-resistant polypropylene alloy and its preparation, can solve the problem of product sticking to the kettle, limited inhibitory effect, and reduce the rigidity of the resin, so as to achieve non-sticking, good fluidity, and impact resistance The effect of increasing strength

Active Publication Date: 2017-06-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Innovene process can produce higher ethylene content, thanks to the self-cleaning stirring paddle in its horizontal reactor that suppresses the problem of product sticking, but this inhibitory effect is limited. It is necessary to obtain impact polypropylene with higher ethylene content products, will inevitably lead to the occurrence of product sticking problems
On the other hand, because the ethylene-propylene copolymer is a low-modulus material, increasing the content of the ethylene-propylene copolymer in the polypropylene alloy can improve the impact resistance, but it will reduce the rigidity of the resin, and it is difficult to adapt to the requirements of high rigidity and high toughness. Application field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1, a kind of preparation method of impact polypropylene, carries out following steps successively:

[0049] (1) Homopolymerization of propylene:

[0050] MgCl 2 / TiCl 4 The catalyst is based on (9,9-bis(methylmethoxy)fluorene as the internal electron donor, MgCl 2 As a carrier, loading TiCl 4 catalyst. MgCl 2 / TiCl 4 The specific preparation method of the type catalyst is: 9.6g (ie, 0.1mol) of anhydrous MgCl 2 After adding 0.1mol 9,9-bis(methylmethoxy)fluorene under the protection of nitrogen, it was immersed in a solution containing 0.76g (ie, 4mmol) of TiCl 4 hexane solution (about 40ml), followed by filtration and drying (dried at 60°C for 180 minutes) to obtain MgCl 2 / TiCl 4 type catalyst.

[0051] That is, MgCl 2 / TiCl 4 The molar ratio of internal electron donor to titanium in the catalyst is 25:1.

[0052] The supported Ziegler-Natta catalytic system consists of MgCl 2 / TiCl 4 Type catalyst (as procatalyst) 8.9g (1mmol), methylaluminoxa...

Embodiment 2

[0058] Embodiment 2, a kind of preparation method of impact polypropylene, carries out following steps successively:

[0059] (1) Homopolymerization of propylene:

[0060] MgCl 2 / TiCl 4 The catalyst is based on (9,9-bis(benzylcarboxymethyl)fluorene as internal electron donor, MgCl 2 As a carrier, loading TiCl 4 catalyst. MgCl 2 / TiCl 4 The specific preparation method of the type catalyst is: 9.6g (ie, 0.05mol) of anhydrous MgCl 2 Add 0.04mol (9,9-bis(benzylcarboxymethyl)fluorene under nitrogen protection and then impregnate in 0.76g (ie, 4mmol) TiCl 4 hexane solution (about 40ml), followed by filtration and drying (dried at 60°C for 180 minutes) to obtain MgCl 2 / TiCl 4 type catalyst.

[0061] That is, MgCl 2 / TiCl 4 The molar ratio of internal electron donor to titanium in the catalyst is 10:1.

[0062] The supported Ziegler-Natta catalytic system consists of MgCl 2 / TiCl 4 Type catalyst (as procatalyst) 5.1g (1mmol), methylaluminoxane (as cocatalyst) 8.7g (0....

Embodiment 3

[0068] Embodiment 3, a kind of preparation method of impact polypropylene, carries out following steps successively:

[0069] (1) Homopolymerization of propylene:

[0070] MgCl 2 / TiCl 4 The catalyst is di-n-butyl phthalate as internal electron donor, MgCl 2 As a carrier, loading TiCl 4 catalyst. MgCl 2 / TiCl 4 The specific preparation method of the type catalyst is: 9.6g (ie, 0.1mol) of anhydrous MgCl 2 Under the protection of nitrogen, 0.2mol di-n-butyl phthalate was added and immersed in a solution containing 0.76g (ie, 4mmol) TiCl 4 hexane solution (about 60ml), followed by filtration and drying (drying at 60°C for 240 minutes) to give MgCl 2 / TiCl 4 type catalyst.

[0071] That is, MgCl 2 / TiCl 4 The molar ratio of internal electron donor to titanium in the catalyst is 50:1.

[0072] The supported Ziegler-Natta catalytic system consists of MgCl 2 / TiCl 4 Type catalyst (as procatalyst) 16.5g (1mmol), methyl aluminoxane (as cocatalyst) 87.0g (0.5mol) and parti...

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Abstract

The invention discloses an anti-impact polypropylene with high ethylene content and high fluidity. The polypropylene is a polypropylene alloy consisting of noblen and ethylene-propylene copolymer, wherein the weight percentage of ethylene is 10 to 30 percent; the polypropylene has a controllable cross-linked structure, and the weight percentage of gel in the anti-impact polypropylene is 0 to 30 percent. A preparation method of the polypropylene comprises the following steps of (1) propylene homopolymerization, i.e., in a reaction vessel, taking propylene as a monomer, taking hydrogen as a molecular weight modifier, and polymerizing under the action of a supported Ziegler-Natta catalytic system or a supported metallocene catalytic system; and (2) ethylene-propylene gas phase copolymerization, i.e., after propylene homopolymerization is finished, removing propylene and hydrogen in the reaction vessel, inletting ethylene-propylene mixed gas and the molecular weight modifier, i.e., the hydrogen into the reaction vessel, and adding inorganic powder II and a cross-linking agent to perform ethylene-propylene gas phase copolymerization to obtain the polymerisate granular alloy.

Description

technical field [0001] The invention relates to an impact-resistant polypropylene and a preparation method thereof, in particular to an impact-resistant polypropylene alloy with high ethylene content and good fluidity and a preparation method thereof. Background technique [0002] Impact polypropylene alloys are a class of high-performance polypropylene resins that are widely used and have 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 or gas 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. Ethylene-propylene gas phase copolymerization is carried out in the reactor. The polypropylene resin obtained through this two-stage polymerization reaction is a multiphase p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/08C08F110/06C08F210/16C08F4/6592C08F4/649C08F4/645
CPCC08F110/06C08F210/16C08L23/0815C08L23/12C08L2308/00C08L2314/02C08L2314/06C08F4/6455C08F4/6494C08F4/65922
Inventor 曹堃姚臻马达锋付强陈薇张景肖智贤屠宇侠王祖飞
Owner ZHEJIANG UNIV
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