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A kind of PEF heat-shrinkable film and preparation method thereof

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

Active Publication Date: 2022-03-01
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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  • A kind of PEF heat-shrinkable film and preparation method thereof
  • A kind of 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 the fumed silica is soaked in an acid solution under a heating condition, the pH value is adjusted to 6-8, and drying treatment is performed; The dry-treated fumed silica is placed under the vapor of tetramethyltetravinylcyclotetrasiloxane, and contacts and reacts in a fluidized bed to obtain modified fumed silica. Wherein, the acid solution can be a hydrochloric acid solution with a mass percentage of 5% to 25%, and the soaking time is not less than 2h, which is not specifically limited. The modified fumed silica used in the present invention can be uniformly dispersed in the system, so as to improve the binding ability of fumed silica and the system, which is beneficial for the modified fumed silica after standing to form a network structure, and can further improve the quality of the formed heat shrinkable film. Stability, mechanical properties, aging resis...

Embodiment 1

[0045] The raw materials are weighed according to the raw material formulation 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 urethane acrylate, 5 parts of modified clay, 4 parts of oleic acid amide and 2 parts of antioxidant 1010; the intermediate film layer is composed of Made from 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 fumed silica, 4 parts of oleic acid amide and 1 part of antioxidant share. The above weighed raw materials of each film layer are respectively put into the high-speed kneader for high-speed kne...

Embodiment 2

[0047] The raw materials are weighed according to the raw material formulation 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 urethane acrylate, 7 parts of modified clay, 4 parts of oleic acid amide and 2 parts of antioxidant 1010; Made from 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 fumed silica, 4 parts of oleic acid amide and 1 part of antioxidant share. The above weighed raw materials of each film layer are respectively put into the high-speed kneader for high-speed kneading, fully mixed, and then added to the t...

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Abstract

The present invention is applicable to the field of material technology, and provides a PEF heat-shrinkable film, including an outer film layer, an intermediate film layer, and an inner film layer; wherein, the outer film layer and the inner film layer are made of the following raw materials in parts by weight Ingredients: 40-55 parts of high-pressure low-density polyethylene, 15-25 parts of high-density polyethylene, 10-15 parts of ethylene-vinyl acetate copolymer, 5-10 parts of polyurethane acrylate, 5-10 parts of modified clay, oleic acid 4-6 parts of amide and 2-5 parts of antioxidant; the intermediate film layer is made of the following raw materials in parts by weight: 25-35 parts of high-pressure low-density polyethylene, 20-30 parts of high-density polyethylene, ethylene- 10-15 parts of vinyl acetate copolymer, 2-6 parts of modified silicon dioxide, 4-6 parts of oleic acid amide, and 1-3 parts of antioxidant; the present invention uses non-toxic and widely sourced raw materials to compound PEF Heat shrinkable film is not only stable in appearance, but also has good physical and mechanical properties such as heat shrinkage rate, tensile properties, and tear strength. It is suitable for packaging and transportation of items including but not limited to food, electronic products, etc., 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 have been various types of plastic packaging films, among which the market demand for heat shrinkable films has grown at an alarming rate and has become a hot spot in the plastic packaging industry. The shrinkage mechanism of the heat shrinkable film is based on the thermal motion of the polymer molecular chain, which is mainly used for the sales and transportation of various products to stabilize, cover and protect the product. Therefore, the heat shrinkable film is required to have High puncture resistance, good shrinkage and shrinkage stress. [0003] Conventional heat shrinkable films mainly include polyvinyl chloride heat shrinkable film, polyethylene heat shrinkable film and polyolefin multilayer heat shrinkable film (POF heat shrinkable film). T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 刘秋贵刘焜刘新
Owner 汕头市明佳热收缩膜有限公司
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