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Multilayer thermal-shrink film and application thereof

A technology of heat-shrinkable film and core layer, which is applied in the direction of layered products, synthetic resin layered products, flexible coverings, etc., can solve the problems of high heat shrinkage temperature, and achieve unbreakable, excellent low-temperature sealing, and excellent cold resistance Effect

Active Publication Date: 2016-10-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal shrinkage rate of the five-layer oriented film described in this invention is large, but its thermal shrinkage temperature is relatively high, and it needs to be used at a relatively high temperature, and there may be problems when it is used for the packaging of plastic products

Method used

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  • Multilayer thermal-shrink film and application thereof
  • Multilayer thermal-shrink film and application thereof
  • Multilayer thermal-shrink film and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (1) Preparation of copolymer

[0073] in such as figure 1 In the fluidized bed reactor 2 shown in which there is nitrogen fluidization, at first through the pipeline 11, a small amount of TiCl loaded with magnesium chloride is continuously input in an amount of 0.1 kg / h. 3 Catalyst and triethylaluminum as cocatalyst, and input ethylene through pipeline 14, pipeline 15 input 1-hexene raw material gas and pipeline 16 input a small amount of isopentane condensing agent, start initial stage in the fluidized bed reactor Olefin polymerization reaction, the reaction produces a small amount of polyethylene. Then gradually increase the consumption of catalyst and cocatalyst to 5kg / h, and gradually increase the consumption of isopentane, and keep the fluidization gas velocity constant. Along with the progress of reaction, continue to input ethylene through pipeline 14, pipeline 15 continues to input 1-hexene raw material gas, thereby constitute circulating medium in the fluidiz...

Embodiment 2

[0083] (1) Preparation of copolymer

[0084] in such as figure 1 In the fluidized bed reactor 2 shown in which there is nitrogen fluidization, at first through the pipeline 11, a small amount of TiCl loaded with magnesium chloride is continuously input in an amount of 0.1 kg / h. 3 Catalyst and triethylaluminum as cocatalyst, and input ethylene through pipeline 14, pipeline 15 input 1-butene raw material gas and pipeline 16 input a small amount of isopentane condensing agent, start initial stage in the fluidized bed reactor Olefin polymerization reaction, the reaction produces a small amount of polyethylene. Then gradually increase the consumption of catalyst and cocatalyst to 5kg / h, and gradually increase the consumption of isopentane, and keep the fluidization gas velocity constant. Along with the progress of reaction, continue to input ethylene through pipeline 14, pipeline 15 continues to input 1-butene raw material gas, thereby constitute circulation medium in fluidized b...

Embodiment 3

[0095] (1) Preparation of multilayer heat shrinkable film

[0096] The multilayer heat-shrinkable film of this embodiment comprises an outer layer 1, a core layer and an outer layer 2 in sequence, and the outer layers 1 and 2 are respectively connected to the two sides of the core layer, and the outer layers 1 and 2 are the most direct contact points of the film and the external environment. outer layer.

[0097] The ratio of the raw materials used for the outer layer 1 and the outer layer 2 is: 96wt% copolymerized polypropylene (MFR=2g / 10min) of Korean LG Chemical Co., Ltd. (MFR=2g / 10min), 4wt% anti-adhesive masterbatch.

[0098] The ratio of raw materials used for the core layer is: 41wt% MVLDPE (trade name "SP1520"), 54wt% ethylene / 1-hexene copolymer obtained in Example 1, 3wt% smooth functional masterbatch and 2wt% carbon eight material.

[0099] Mix the outer layer 1, outer layer 2 and core layer materials evenly according to the above ratio, then transport them to the s...

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Abstract

The invention discloses a multilayer thermal-shrink film and an application thereof. The multilayer thermal-shrink film includes a core layer and an external layer, wherein the core layer includes a copolymer of ethylene and [alpha]-olefin, the copolymer accounting for 50-80 wt% of the core layer; the weight-average molecular weight of the copolymer is 20000-250000 and molecular weight distribution index is 2-15. The multilayer thermal-shrink film has good thermal-shrink performance, high tearing strength and good cold resistance, and can be widely used in package materials or commodity labels.

Description

technical field [0001] The invention relates to a film product, in particular to a multilayer heat shrinkable film and its application. Background technique [0002] Shrink film, also known as heat shrink film, is widely used in industrial and retail packaging. Such films are capable of shrinking when heat is applied, thereby relieving stress imparted to the film during or after extrusion. Shrinkage can occur in one direction or in both longitudinal and transverse directions. [0003] Traditional biaxially oriented polyolefin materials have low density (less than 1g / cm 3 ), easy to recycle, and non-polluting combustion, so it has become a research hotspot for environmentally friendly heat shrinkable films. However, this film also has the disadvantage of high shrinkage temperature, which will greatly limit its application expansion. The traditional polyolefin shrink film can only obtain a shrinkage value of 40% at a temperature above 110°C. At such a high temperature, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/08B32B27/30B32B27/32B65D65/40G09F3/02
Inventor 吴文清高文清孙红霞崔宇辉阳永荣李世博王靖岱韩国栋胡晓波陈毓明王静魏文学蒋斌波薛少利黄正梁王景江廖祖维郭俊芝
Owner CHINA PETROLEUM & CHEM CORP