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Polyethylene base film specially used for compounding with polyvinyl alcohol film and preparation method thereof

A polyvinyl alcohol film and polyethylene technology, which is applied in the field of polyethylene base film and its preparation, can solve the problems of loss of performance of the composite film, reduction of the performance of the composite film, separation of the composite layer of the composite film, etc., to improve the surface energy, increase the Composite and composite quality effects

Inactive Publication Date: 2016-05-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even if the intermediate adhesive layer is used, the composite film will be damaged or even completely separated or the composite layer will be detached due to the strong hygroscopicity of polyvinyl alcohol (PVA) in the presence of moisture or in a high-humidity environment; this is because After polyvinyl alcohol (PVA) absorbs water, it penetrates into the middle layer and polyethylene (PE) composite layer through the film, and because the non-polar surface (ie oily surface) of polyethylene film (PE) is very easy to produce in the presence of moisture The separation of oil and water leads to the separation and detachment of the composite surface of the composite film, which reduces the performance of the composite film and even completely loses the performance of the composite film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The name of each raw material component of the polyethylene base film and the proportion of each component to the total mass of the raw material are as follows:

[0029] Film grade high density polyethylene (HDPE) 90.5

[0030] Ethylene-acrylic acid copolymer (AA content: 18%)5

[0031] Polyethylene oxide (PEO) 3

[0032] Polyethylene glycol (PEG-400) 1

[0033] Precipitated white carbon black (5000 mesh) 0.5

[0034] According to the above-mentioned components, first add film-grade high-density polyethylene, ethylene-acrylic acid copolymer (AA content: 18%) and polyethylene oxide into a high-speed mixer, and mix at a low speed of 100 rpm for 5 minutes; then add Polyethylene glycol (PEG-400), mix at 500 rpm for 5 minutes at high speed, finally add precipitated silica (5000 mesh), mix at high speed (500 rpm) for 10 minutes, turn at low speed (100 rpm) / min) discharge; the mixed material is kneaded and granulated by a twin-screw extruder; It is extruded and blown in...

Embodiment 2

[0036] The name of each raw material component of the polyethylene base film and the proportion of each component to the total mass of the raw material are as follows:

[0037] Film grade low density polyethylene (LDPE) 78.5

[0038] Ethylene-acrylic acid copolymer (AA content: 35%) 10

[0039] Polyethylene oxide (PEO) 8

[0040] Polyethylene glycol (PEG-800) 2

[0041] Precipitated white carbon black (8000 mesh) 1.5

[0042] According to the above-mentioned components, first add film-grade low-density polyethylene, ethylene-acrylic acid copolymer (AA content: 35%) and polyethylene oxide into the high-speed mixer, and mix at a low speed of 300 rpm for 3 minutes; then add Polyethylene glycol (PEG-800), mix at 800 rpm for 5 minutes at high speed, finally add precipitated silica (8000 mesh), mix at high speed (500 rpm) for 10 minutes, turn at low speed (100 rpm) / min) discharge; the mixed material is kneaded and granulated by a twin-screw extruder; It is extruded and blown in...

Embodiment 3

[0044] The name of each raw material component of the polyethylene base film and the proportion of each component to the total mass of the raw material are as follows:

[0045] Film Grade Linear Low Density Polyethylene (LLDPE) 70

[0046] Ethylene-acrylic acid copolymer (AA content: 28%) 15

[0047] Polyethylene oxide (PEO) 10

[0048] Polyethylene glycol (PEG-600) 3

[0049] Precipitated silica (6000 mesh) 2

[0050] According to the above-mentioned components, first add film-grade linear low-density polyethylene, ethylene-acrylic acid copolymer (AA content: 28%) and polyethylene oxide into a high-speed mixer, and mix at a low speed of 300 rpm for 5 minutes; Then add polyethylene glycol (PEG-600), mix at 600 rpm for 5 minutes at high speed, finally add precipitated silica (6000 mesh), mix at high speed (800 rpm) for 5 minutes, turn to low speed ( 100 rpm) discharge; the mixed material is mixed and granulated by a twin-screw extruder; The material is then extruded and bl...

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Abstract

The present invention discloses a polyethylene base film specially used for compounding with a polyvinyl alcohol film and a preparation method thereof, the polyethylene base film comprises 70-90.5 wt% of polyethylene (PE), 5-15 wt% of an ethylene-acrylic acid copolymer (EAA); 3-10 wt% of polyethylene oxide (PEO); 1-3 wt% of polyethylene glycol (PEG) and 0.5-2.0 wt% of precipitated white carbon black, and the polyethylene base film is prepared as follows: granulating at 120-180 DEG C with a twin-screw extruder, blowing for molding or flow-casting to form the film at 160-180 DEG C with a single screw extruder. The modified polyethylene (PE) film is compounded with the polyvinyl alcohol (PVA) film, erosion damage in moisture or high humidity environment can be significantly improved, and after a composite film is processed at 23 DEG C in environment with the relative humidity RH of 90% for 48 hours, the peel strength is greater than or equal to 2.0N / 15min.

Description

technical field [0001] The invention relates to the field of films, in particular to a polyethylene base film specially used for compounding with polyvinyl alcohol films and a preparation method thereof. Background technique [0002] Polyethylene plastic (PE) film is widely used in the packaging of fruits, vegetables and other foods because of its non-toxic, tasteless, hygienic and safe, and water vapor barrier. However, in use, due to the low barrier properties of polyethylene film to oxygen, carbon dioxide, etc., the packaged food is prone to deterioration or quality degradation due to oxidation within a certain period of time. In order to improve the performance of packaging films, at present: 1) Use films with excellent barrier properties for composite use, such as using EVOH, PVDC and other films with excellent barrier properties to prepare films for packaging food; 2) Aluminum plating polyolefin films etc., are all to improve the barrier performance of polyolefin su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08L23/08C08L71/02C08K3/36
CPCC08J5/18C08J2323/06C08J2323/08C08J2423/08C08J2471/02C08L23/06C08L23/0815C08L2201/14C08L2203/162C08L2205/025C08L2205/035C08L2205/08C08L2207/062C08L2207/066C08L23/0869C08L71/02C08K3/36
Inventor 崔跃飞
Owner SOUTH CHINA UNIV OF TECH
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