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Modified polyethylene film and composite film made of same

A technology of polyethylene film and composite film, which is applied in the field of packaging materials, can solve the problems of unopenable composite film, low composite film, and easy delamination, etc., and achieve good easy-to-open performance, high adhesive strength, and improved adhesion combined strength effect

Active Publication Date: 2012-10-10
ZHEJIANG GOLDSTONE PACKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the prior art, in using the incompatibility of polyethylene and polybutene to improve the easy-to-open performance and heat-sealing strength of the composite film, it is impossible to solve the problem of transverse and longitudinal stretching of the film at the same time. The strength is low, the composite film is prone to delamination, the sealing effect is not good, and the composite film cannot be uncovered under a suitable opening force, so as to provide a modified polymer suitable for the composite film heat seal layer. vinyl film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, 50kg of linear low-density polyethylene (Shanghai Secco Petrochemical, 0220kj, melt index 2.0), 20kg of polyisobutylene (Germany Basel Company, PB0110M, melt index 0.4), 30kg of ethylene-propylene copolymer (Nippon Polychem, WFX4TA, Melt index 4.0) uniformly mixed to form a blend, and then the blend is added to the film blowing machine (Dalian Zhenghuayang Plastic Machinery Co., SJGM-Z65×30*32000, the same below), through blowing The modified polyethylene film a is prepared by the film method, wherein the modified polyethylene film a does not appear delamination.

[0032] As an alternative embodiment, linear low-density polyethylene with a melt index of 1.0-2.0g / 10min, polyisobutylene with a melt index of 0.2-1.0g / 10min, and ethylene-propylene copolymer with a melt index of 1.0-4.0g / 10min are used. Materials and other materials with different melt indexes can also be used to prepare modified polyethylene film, and the heat-sealing strength of the modified polyethyle...

Embodiment 2

[0034] First, 60kg low-density polyethylene (BASF, 24200H, melt index 2.0), 15kg poly-n-butene (Netherlands Andre Basel, KTAR05, melt index 0.5g / 10min), 25kg ethylene-propylene copolymer (Japan Chemical Poly Company, WFX4TA, melt index 4.0) uniformly mixed to form a blend, and then the blend is added to the film blowing machine, the modified polyethylene film b is prepared by the film blowing method, wherein the modified polyethylene film b There is no delamination.

[0035] As an alternative embodiment, low-density polyethylene with a melt index of 1.0-2.0g / 10min, poly-n-butene with a melt index of 0.2-1.0g / 10min, and ethylene-propylene with a melt index of 1.0-4.0g / 10min are used. Copolymers and other raw materials with different melt indices can also be used to prepare modified polyethylene films, and the heat-sealing strength of the modified polyethylene film after heat sealing is maintained in the range of 5-15N / 15mm, which is easy to uncover Performance and sealing perform...

Embodiment 3

[0037] First, 50kg of linear low-density polyethylene (Shanghai Secco Petrochemical, 0220kj, melt index 2.0), 25kg of modified polybutene (polymer of butene and acrylate, melt index 0.5g / 10min), 25kg of ethylene-propylene copolymer (Nippon Kaju Co., WFX4TA, melt index 4.0) uniformly mixed to form a blend, and then the blend is added to the blown film machine, the modified polyethylene film c is prepared by the blown film method, wherein the modified There is no delamination in the polyethylene film c.

[0038] As an alternative embodiment, modified polybutene with a melt index of 0.2-1.0g / 10min can also be used to prepare a modified polyethylene film, and the heat-sealing strength of the modified polyethylene film after heat sealing is maintained at Within the range of 5-15N / 15mm, it has good easy-to-open performance and sealing performance without delamination.

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Abstract

The invention provides a modified polyethylene film which is characterized by comprising, by weight, 40-60 parts of linear low density polyethylene and / or low density polyethylene, 15-25 parts of polybutylene or modified polybutylene and 25-35 parts of ethylene-propylene copolymer. The invention further provides a composite film made of the modified polyethylene film. Horizontal and longitudinal tensile strength of the modified polyethylene film are improved, no stratification occurs when the modified polyethylene film is processed and used, composite film packing materials which are made further have good sealing effect, and the modified polyethylene film keeps good easy-to-uncover performance.

Description

Technical field [0001] The invention relates to a modified polyethylene film and a composite film made therefrom, belonging to the field of packaging materials. Background technique [0002] Polyethylene (PE) mainly includes low density polyethylene, linear low density polyethylene and high density polyethylene. Low-density polyethylene and linear low-density polyethylene can be used in packaging materials, while high-density polyethylene is not suitable for making packaging materials because of its poor aging resistance and easy cracking under environmental stress. Generally, it is only suitable for making pipes and hollows. Bottles, injection products and other products. In packaging materials, low-density polyethylene and linear low-density polyethylene are generally used to make the heat-sealing layer of the composite film, and then the heat-sealing layers of the composite film are heat-sealed in pairs to achieve the sealing effect. However, low-density polyethylene and lin...

Claims

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Application Information

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IPC IPC(8): B32B27/32
Inventor 张文锋曾文明孙国锦杨虎平
Owner ZHEJIANG GOLDSTONE PACKING
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