A kind of polyolefin heat-shrinkable film and its preparation method and application

A polyolefin heat shrinkable film technology, applied in applications, other household appliances, chemical instruments and methods, etc., can solve problems such as difficulty in maintaining tensile properties, achieve good gloss, improve transparency and mechanical properties, and surface water resistance Effect

Active Publication Date: 2020-08-11
黄山至德新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Examples of similar comprehensive properties that are difficult to take into account are the Chinese patent documents with publication numbers CN 103360664 A and CN 106009209 A. When the two try to prepare high-transparency polyolefin heat-shrinkable films, it is difficult to maintain the ideal tensile properties of the film.

Method used

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  • A kind of polyolefin heat-shrinkable film and its preparation method and application
  • A kind of polyolefin heat-shrinkable film and its preparation method and application
  • A kind of polyolefin heat-shrinkable film and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] The polyolefin heat-shrinkable film prepared in this example comprises a polypropylene outer layer, a polypropylene inner layer, and three layers of polyethylene middle layers, with a total of five-layer structure, wherein the raw material composition of the polypropylene outer layer and the polypropylene inner layer are exactly the same , are recorded as the PP layer, and the composition of the raw materials of the three-layer polyethylene middle layer is exactly the same, and are recorded as the PE layer. Specifically, the mixture of the PP layer and the PE layer is prepared according to the following formula:

[0072] PP layer:

[0073] 90 copies of imported polypropylene masterbatch (6612L);

[0074] Micron-level silicon dioxide (2μm), nano-level silicon dioxide (50nm), the mass ratio is 2:1, a total of 5 parts;

[0075] Polydimethylsiloxane-polyethylene block copolymer (number average molecular weight is 6400g / mol, PDI=1.5, siloxane content 21wt%) 3 parts, maleic ...

Embodiment 2

[0090] In the PP layer mixture, except for the compatibilizer, the composition and proportioning of other raw materials are exactly the same as in Example 1, the difference is that 3 parts of polydimethylsiloxane-polyethylene graft copolymer (number average molecular weight of 9800g / mol, PDI=2.3, siloxane content 38wt%) and 2 parts of maleic anhydride grafted polyethylene;

[0091] In the PE layer mixture, except for the compatibilizer, the composition and proportion of other raw materials are exactly the same as in Example 1, the difference is that only 2 parts of polydimethylsiloxane-polyethylene graft copolymer are added, and 2 parts of horse To acid anhydride grafted polyethylene;

[0092] The preparation process is exactly the same as that in Example 1, and the performance parameters of the polyolefin heat-shrinkable film prepared in this example are listed in Table 1 below.

Embodiment 3

[0094] In the PP layer mixture, except for the polypropylene masterbatch and compatibilizer, the composition and proportion of other raw materials are exactly the same as in Example 1, the difference is that the addition of polypropylene masterbatch is 78 parts, polydimethylsiloxane -The addition of polyethylene block copolymer is 10 parts, and the addition of maleic anhydride grafted polyethylene is 4 parts;

[0095] The preparation process is exactly the same as that in Example 1, and the performance parameters of the polyolefin heat-shrinkable film prepared in this example are listed in Table 1 below.

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Abstract

The invention discloses a polyolefin heat-shrinkable film. The heat-shrinkable film comprises a polypropylene outer layer, a polypropylene inner layer and a polyethylene intermediate layer. Raw materials of the polypropylene outer layer and the polypropylene inner layer are relatively independent, and the raw materials comprise a polypropylene base material, a compatilizer, an antiblocking agent,a delustering agent and other additives. At least one layer of the polyethylene intermediate layer is arranged, raw materials of each polyethylene intermediate layer are relatively independent, and the raw materials comprise a polyethylene base material, the compatilizer and other additives. The compatilizer comprises a polysiloxane-polyolefin copolymer or is the polysiloxane-polyolefin copolymerand maleic anhydride grafted polyethylene. The antiblocking agent comprises a micron-scale antiblocking agent and a nano-scale antiblocking agent. The delustering agent is selected from fluoroelastomers. The polyolefin heat-shrinkable film with excellent comprehensive performance is prepared through a special formula and a special preparation process, the heat shrinkage rate is high, transparencyand glossiness are good, mechanical properties are excellent, the sealing is firm, the thermal decomposition temperature is high, hydrophobicity is good, and the polyolefin heat-shrinkable film can beused as a high-performance food packaging film.

Description

technical field [0001] The invention relates to the technical field of heat-shrinkable films for packaging, in particular to a polyolefin heat-shrinkable film and its preparation method and application. Background technique [0002] For a long time, the packaging of short-cycle fast-moving foods such as dried noodles has generally been packaged in paper packaging, but paper packaging has disadvantages such as poor water resistance and poor strength when wet, and most of the paper packaging is still in the manual packaging stage. , low production efficiency, unhygienic, high cost, so the use of fully automatic heat shrinkable film production process instead of paper packaging process has become the current trend. [0003] Multi-layer co-extruded polyolefin heat shrinkable film (POF) uses linear low density polyethylene as the middle layer, and co-polypropylene as the inner and outer layers. It is plasticized and extruded by three extruders, and then formed by a die. It is pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/20B32B27/32B32B33/00B29D7/01
CPCB29D7/01B32B27/08B32B27/20B32B27/32B32B33/00B32B2250/242B32B2307/306B32B2307/412B32B2307/73B32B2439/70
Inventor 董文星郭必威张先伟
Owner 黄山至德新材料科技有限公司
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