PE shrink film

A shrink film and modification technology, which is applied in the field of PE shrink film, can solve the problems of poor shrinkage performance, low tensile strength, and high crystallinity, and achieve the effects of good shrinkage, high tensile strength, and low crystallinity

Active Publication Date: 2020-05-05
ZHENGXIN PACKAGING CO LTD DONGGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing PE shrink film is composed of general PE materials, which has high crystallinity, low tensile strength, and poor shrinkage performance. Therefore, it is necessary to provide a PE shrink film with good Under the premise of the effect, reduce the thickness of the film to achieve the effect of light weight

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The PE shrink film is made of 2% PET and 98% modified PE, wherein the modified PE is modified by 0.1% crosslinking agent accounting for PE weight and 5% methyl methacrylate accounting for PE weight. into, the density of PE is 0.918g / cm 3 , the melt index is 1.0, and the weight of PE weighed is 500 parts.

[0026] The preparation method of modified PE is:

[0027] (1) Dissolving PE in toluene for 2-4 hours, the dissolution temperature is 75-85°C, specifically in this embodiment, the dissolution temperature is 80°C, and the dissolution time is 3h;

[0028] (2) Adding BPO and methyl methacrylate to react, the reaction temperature is 90-100° C., and the reaction time is 20-28 hours. Specifically, in this embodiment, the water bath is 95° C. for 24 hours;

[0029] (3) After the reaction is finished, the product is filtered clean with acetone.

Embodiment 2

[0031] The PE shrink film is made of 10% PET and 90% modified PE, wherein the modified PE consists of 0.5% crosslinking agent accounting for PE weight and 20% monomer (the weight of acrylonitrile in the monomer is 30%, the unit weight of methyl methacrylate is 70%) modified by PE, and the density of PE is 0.918g / cm 3 , the melt index is 1.0, and the weight of PE weighed is 500 parts.

[0032] Examples 2 to 7 except for the different components and proportions listed in Table 1, the rest of the formulation parameters and the preparation method of modified PE are the same as in Example 1. It should be noted that the compatibilizers in all examples are selected Maleic anhydride graft compatibilizer, specifically SEBS-g-MAH.

[0033] Table 1 each embodiment component and proportioning

[0034]

[0035]

Embodiment 3

[0050] Embodiment 3 is compared with embodiment 4, and the test result of embodiment 3 is better than embodiment 4, may be due to the reason of adding compatibilizer in embodiment 3, compatibilizer helps PET and modified PE better Compatibility, thereby improving the overall performance of PE shrink film.

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Abstract

The invention provides a PE shrink film, which is formed by blending and film blowing of raw materials. The raw materials comprise, by weight, 1-10% of PET, 90-98% of modified PE and 0-2% of a compatibilizer, and the raw materials of the modified PE comprise a PE material, a cross-linking agent and a methyl methacrylate monomer. According to the PE shrink film provided by the invention, the crystallinity of the modified PE is low, so that the tensile property and the shrinkage property of the PE shrink film are enhanced. The methyl methacrylate monomer in the modified PE and the polyethylene are subjected to grafting reaction, so that the affinity of the polyethylene and other materials can be improved, the modified PE and the PET have good compatibility, layering during co-extrusion of the modified PE and the PET can be avoided, and the PET shrink film prepared by mixing the modified PE and the PET is good in shrinkage and high in tensile strength.

Description

technical field [0001] The invention relates to the technical field of PE films, in particular to a PE shrink film. Background technique [0002] PE shrink film is an industrial packaging film product, which has the characteristics of recycling, non-toxic, odorless, and good mechanical properties. It can be used for hand-wrapping film and machine-use stretching film. It can be widely used in centralized packaging of various goods. Polyethylene shrink film is a kind of material with good toughness. It is widely used in the packaging of alcohol, cans, mineral water, various beverages, cloth and other products. The product has good flexibility, impact resistance, and Strong tear resistance, not easy to break. [0003] At present, the existing PE shrink film is composed of general PE materials, which has high crystallinity, low tensile strength, and poor shrinkage performance. Therefore, it is necessary to provide a PE shrink film with good Under the premise of the effect, red...

Claims

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Application Information

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IPC IPC(8): C08L51/06C08L67/02C08L51/00C08J5/18
CPCC08J5/18C08J2351/06C08J2467/02C08J2451/00C08J2451/06
Inventor 林仰璇林城黄镇荣
Owner ZHENGXIN PACKAGING CO LTD DONGGUAN
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