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Preparation method of polypropylene film layer capable of improving barrier property

A technology of polypropylene film and barrier performance, which is applied in the field of preparation of polypropylene film layer, can solve the problems of inability to enhance the barrier property of polypropylene film layer, increase gas transmission rate, and poor gas barrier property, and achieve excellent oxygen barrier performance, Good application prospects, the effect of improving barrier properties

Inactive Publication Date: 2021-01-05
GUANGDONG ANDELI NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas barrier properties of polypropylene are extremely poor, and most of the high barrier polymers currently used are polar polymers, which interact weakly with the non-polar polypropylene matrix interface, and there are "gaps" at the interface between the two. The "gaps" increase the gas transmission rate and thus cannot enhance the barrier properties of the polypropylene film layer

Method used

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  • Preparation method of polypropylene film layer capable of improving barrier property

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Embodiment 1

[0036] This embodiment provides a method for preparing a polypropylene film layer with improved barrier properties, which specifically includes the following steps:

[0037] (1) Preparation of isotactic polypropylene: in a dry reactor, based on the toluene solvent added every 50ml, the amount of the added reaction raw materials and catalyst is: add 25mmol alkyl aluminoxane, 15mol chain transfer agent and 0.02mmol metallocene catalyst, feed 10mmol hydrogen; feed propylene gas at a reaction temperature of 50°C, and keep the propylene reaction pressure at 1 atmosphere; obtain isotactic polypropylene after the reaction is completed; wherein, the chain transfer agent is metadiethylene Benzene, the metallocene catalyst is rac-Me 2 C(2-t-Bu-Cp) 2 ZrCl 2 , the cocatalyst is methyl aluminoxane;

[0038] (2) Preparation of silica modifier:

[0039] S1. carry out polymerization reaction with vinyl acetate, allyl glycidyl ether and initiator, obtain vinyl acetate-allyl glycidyl ether ...

Embodiment 2

[0043](1) Preparation of isotactic polypropylene: in a dry reactor, based on the toluene solvent added every 50ml, the amount of the added reaction raw materials and catalyst is: add 30mmol alkyl aluminoxane, 12mol chain transfer agent and 0.015mmol metallocene catalyst, feed 5mmol hydrogen; feed propylene gas at a reaction temperature of 15°C, keep the propylene reaction pressure at 8 atmospheres; obtain isotactic polypropylene after the reaction is completed; wherein, the chain transfer agent is p-diethylene Benzene, the metallocene catalyst is rac-Me 2 Si(2-Me-4-Naph-Ind) 2 ZrCl 2 , the cocatalyst is ethyl aluminoxane;

[0044] (2) Preparation of silica modifier:

[0045] S1. carry out polymerization reaction with vinyl acetate, allyl glycidyl ether and initiator, obtain vinyl acetate-allyl glycidyl ether copolymer;

[0046] S2. Use the vinyl acetate-allyl glycidyl ether copolymer to modify silica to obtain a silica modifier, and the weight ratio of vinyl acetate to all...

Embodiment 3

[0049] (1) Preparation of isotactic polypropylene: in a dry reactor, based on the toluene solvent added every 50ml, the amount of the added reaction raw materials and catalyst is: add 20mmol alkyl aluminoxane, 10mol chain transfer agent and 0.01mmol metallocene catalyst, feed 5mmol hydrogen; feed propylene gas at a reaction temperature of 20°C, keep the propylene reaction pressure at 2 atmospheres; obtain isotactic polypropylene after the reaction is completed; wherein, the chain transfer agent is 1,2 - Bis(4-vinylbenzene)ethane, the metallocene catalyst is rac-Me 2 Si(2-Me-4-Ph-Ind) 2 ZrCl 2 , the cocatalyst is isobutylaluminoxane;

[0050] (2) Preparation of silica modifier:

[0051] S1. carry out polymerization reaction with vinyl acetate, allyl glycidyl ether and initiator, obtain vinyl acetate-allyl glycidyl ether copolymer;

[0052] S2. Use the vinyl acetate-allyl glycidyl ether copolymer to modify silica to obtain a silica modifier, and the weight ratio of vinyl ace...

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Abstract

The invention discloses a preparation method of a polypropylene film layer capable of improving barrier property, which specifically comprises the following steps: (1) in the presence of hydrogen, catalyzing propylene polymerization by using a catalytic system consisting of a metallocene catalyst and an alkylaluminoxane cocatalyst by using a styrene derivative as a chain transfer agent to obtain isotactic polypropylene; (2) blending the isotactic polypropylene with polypropylene random copolymer, an isotactic polypropylene bpolyethylene glycol diblock copolymer, polyvinyl alcohol, a silicon dioxide modifier, a nucleating agent and a compatilizer, performing sufficient melt blending in a screw extruder after blending, and performing extrusion and bidirectional stretching to obtain a polypropylene film layer, wherein the nucleating agent is a beta crystal form nucleating agent. The aluminum-plastic film prepared from the polypropylene film layer provided by the invention is better in gas-liquid barrier property, higher in safety and longer in service life, and has a good application prospect.

Description

technical field [0001] The invention relates to the field of polypropylene packaging materials, in particular to a method for preparing a polypropylene film layer with improved barrier performance. Background technique [0002] The green, high-energy and environmentally friendly lithium-ion battery that appeared in the 1990s has become one of the most eye-catching power sources due to its advantages such as high energy density, long cycle life, and high operating voltage. In recent years, with the increase of lithium battery technology and output, the demand for lithium battery packaging materials is also increasing. At present, lithium battery packaging can be divided into four types: plastic shell, steel shell, aluminum shell and aluminum-plastic film. Aluminum-plastic film materials Due to its light weight and good formability, it has become one of the main packaging materials for lithium batteries. The quality of lithium battery packaging is directly related to the yiel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L87/00C08L29/04C08K9/04C08K3/36C08J5/18
CPCC08J5/18C08J2323/12C08J2423/14C08J2487/00C08J2429/04C08K9/04C08K3/36
Inventor 陈汉城王桂彬林杰生熊泽民
Owner GUANGDONG ANDELI NEW MATERIALS CO LTD
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