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PEF heat shrinkable film and preparation method thereof

A heat-shrinkable film and film layer technology, applied in the field of materials, can solve the problems of unstable film bubbles, difficulty in recycling heat-shrinkable films, and difficulty in grasping, and achieve good heat shrinkage rate, good development prospects, and the effect of promoting recycling.

Active Publication Date: 2020-06-12
汕头市明佳热收缩膜有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a PEF heat-shrinkable film, which aims to solve the difficulty in recycling the existing heat-shrinkable film, and when the double-bubble method is used for production, the film bubbles are often unstable, resulting in crystal points, water marks on the film surface, and the impact on the film thickness. Difficult to grasp, high requirements on the quality and performance of the extruder, and the problem that the physical and mechanical properties need to be improved

Method used

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  • PEF heat shrinkable film and preparation method thereof

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preparation example Construction

[0026] In the embodiment of the present invention, the preparation method of the modified fumed silica includes: after soaking the fumed silica in an acid solution under heating conditions, adjusting the pH value to 6-8, and drying; The dry-treated fumed silica is placed under the steam of tetramethyltetravinylcyclotetrasiloxane, and is contacted and reacted in the fluidized bed to obtain modified fumed silica. Wherein, the acid solution may be a hydrochloric acid solution with a mass percentage of 5% to 25%, and the soaking time is not less than 2 hours, which is not specifically limited. The modified fumed silicon used in the present invention can be uniformly dispersed in the system, which improves the binding ability of the fumed silicon dioxide and the system, is conducive to the formation of a network structure of the modified gas silicon after standing, and can further improve the heat-shrinkable film after forming. Stability, mechanical properties, aging resistance, et...

Embodiment 1

[0045] The raw materials are weighed according to the raw material formula of the outer film layer, the middle film layer and the inner film layer as described below, wherein the outer film layer and the inner film layer are all made of the following raw materials in parts by weight: high pressure low density polyethylene 40 parts, 15 parts of high-density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 5 parts of polyurethane acrylate, 5 parts of modified clay, 4 parts of oleic acid amide and 10102 parts of antioxidant; the intermediate film layer consists of the following Raw materials in parts by weight: 25 parts of high-pressure low-density polyethylene, 20 parts of high-density polyethylene, 10 parts of ethylene-vinyl acetate copolymer, 2 parts of modified silicon dioxide, 4 parts of oleic acid amide and 1 part of antioxidant . Put the above-mentioned weighed raw materials of each film layer into the high-speed kneader for high-speed kneading, mix well, and th...

Embodiment 2

[0047] The raw materials are weighed according to the raw material formula of the outer film layer, the middle film layer and the inner film layer as described below, wherein the outer film layer and the inner film layer are all made of the following raw materials in parts by weight: high pressure low density polyethylene 45 parts, 18 parts of high-density polyethylene, 12 parts of ethylene-vinyl acetate copolymer, 7 parts of polyurethane acrylate, 7 parts of modified clay, 4 parts of oleic acid amide and 10102 parts of antioxidant; the intermediate film layer consists of the following Raw materials in parts by weight: 28 parts of high-pressure low-density polyethylene, 23 parts of high-density polyethylene, 12 parts of ethylene-vinyl acetate copolymer, 3 parts of modified silicon dioxide, 4 parts of oleic acid amide and 1 part of antioxidant . Put the above-mentioned weighed raw materials of each film layer into the high-speed kneader for high-speed kneading, mix well, and th...

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Abstract

The invention is applicable to the technical field of materials, and provides a PEF heat shrinkable film. The PEF heat shrinkable film comprises an outer film layer, a middle film layer and an inner film layer, wherein each of the outer film layer and the inner film layer is prepared from, by weight, 40-55 parts of high-pressure low-density polyethylene, 15-25 parts of high-density polyethylene, 10-15 parts of an ethylene-vinyl acetate copolymer, 5-10 parts of polyurethane acrylate, 5-10 parts of modified argil, 4-6 parts of oleamide and 2-5 parts of an antioxidant; and the middle film layer is prepared from, by weight, 25-35 parts of high-pressure low-density polyethylene, 20-30 parts of high-density polyethylene, 10-15 parts of the ethylene-vinyl acetate copolymer, 2-6 parts of modifiedgas silicon, 4-6 parts of oleamide and 1-3 parts of the antioxidant. The PEF heat shrinkable film formed by compounding the raw materials which are nontoxic and wide in source is stable in appearance,has good physical and mechanical properties such as the heat shrinkage rate, the tensile property and the tearing strength, is suitable for package and transportation of articles including but not limited to foods, electronic products and the like, and has good development prospects.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a PEF heat-shrinkable film and a preparation method thereof. Background technique [0002] In recent years, there are various types of plastic packaging films, among which the market demand for heat shrinkable films has grown at an astonishing rate, and has become a hot spot in the plastic packaging industry. The shrinkage mechanism of heat shrinkable film is based on the thermal movement of polymer molecular chains. It is mainly used in the sales and transportation of various products to stabilize, cover and protect products. Therefore, heat shrinkable films are required to have High puncture resistance, good shrinkage and shrinkage stress. [0003] Conventional heat-shrinkable films mainly include polyvinyl chloride heat-shrinkable films, polyethylene heat-shrinkable films, and polyolefin multilayer heat-shrinkable films (POF heat-shrinkable films). Toxicity, wi...

Claims

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Application Information

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IPC IPC(8): B32B27/32B32B38/00B32B27/18B32B27/08B32B37/00C08L23/06C08L23/08C08L75/14C08K9/04C08K9/06C08K3/34C08K5/20C08K9/02C08K3/36C08J5/18
CPCB32B27/32B32B38/0036B32B27/18B32B27/08B32B37/00C08J5/18C08J2323/06C08J2423/06C08J2423/08C08J2475/14C08K9/04C08K9/06C08K3/346C08K5/20C08K9/02C08K3/36
Inventor 刘秋贵刘堒刘新
Owner 汕头市明佳热收缩膜有限公司
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