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High-barrier bi-directionally stretched polythene film and preparation method thereof

A technology of polyethylene film and biaxial stretching, which is applied in the direction of chemical instruments and methods, flat products, and other household appliances, can solve the problem of difficult to improve the gas barrier performance of biaxially stretched polyethylene film, and the difficulty of matching the temperature of biaxial stretching process. Stretch and other issues, to achieve the effect of excellent barrier properties and mechanical properties, low cost, high mechanical strength and stiffness

Active Publication Date: 2015-05-06
GUANGDONG DECRO FILM NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although EVOH has excellent gas barrier properties, both EVOH and polyethylene have high crystallinity, and the two-way stretching process temperature is difficult to match and stretch, so EVOH cannot be applied to the existing two-way stretching process. In the modification of stretched polyethylene film, it is difficult to improve the gas barrier properties of the existing biaxially stretched polyethylene film

Method used

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  • High-barrier bi-directionally stretched polythene film and preparation method thereof
  • High-barrier bi-directionally stretched polythene film and preparation method thereof
  • High-barrier bi-directionally stretched polythene film and preparation method thereof

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Embodiment 1

[0024] The polyethylene resin was prepared by catalytic polymerization of ethylene and 5wt% hexene with a metallocene catalyst, and its melt index (MFR) was 1.7g / 10min.

[0025] Polyethylene resin A, maleic anhydride modified polyethylene resin (maleic anhydride graft rate 0.5%) B and ethylene-vinyl alcohol copolymer resin (vinyl content is 32wt%) C are co-extruded through an extruder , meet at the five-layer die head to form a resin melt with A / B / C / B / A structure, and form a resin sheet with A / B / C / B / A structure after being cooled by a chill roll at 30°C ;Introduce the resin sheet into the longitudinal stretching device in the biaxial stretching equipment, after preheating at 120°C, stretch it 4 times under the condition of 80°C, and then enter the transverse stretching equipment, after preheating at 130°C, Stretch 8 times at 120°C, and then shape at 125°C to form a high-barrier biaxially oriented polyethylene film with A / B / C / B / A structure. The film is wound up after surface co...

Embodiment 2

[0028] The polyethylene resin was prepared by catalytic polymerization of ethylene and 6wt% hexene with a metallocene catalyst, and its melt index (MFR) was 1.5g / 10min.

[0029] Get polyethylene resin, maleic anhydride modified polyethylene resin (maleic anhydride graft rate is 2%) and ethylene-vinyl alcohol copolymer resin (vinyl content is 27wt%), wherein, add 2wt% in the polyethylene resin Anti-blocking agent, add 1wt% antistatic agent and 1wt% smooth agent in maleic anhydride modified polyethylene resin. Co-extrude polyethylene resin A, maleic anhydride-modified polyethylene resin B and ethylene-vinyl alcohol copolymer resin C through an extruder, and meet at the five-layer die to form A / B / C / B / A The resin melt of the structure is cooled by a chill roll at 35°C to form a resin sheet with a structure of A / B / C / B / A; After preheating at 80°C, it is stretched 4.5 times at 80°C, and then enters the transverse stretching equipment. After preheating at 130°C, it is stretched 9 tim...

Embodiment 3

[0032]The polyethylene resin is prepared by catalytic polymerization of ethylene and 5wt% octene with a metallocene catalyst, and its melt index (MFR) is 2.5g / 10min.

[0033] Polyethylene resin A, maleic anhydride modified polyethylene resin (maleic anhydride graft rate 1%) B and ethylene-vinyl alcohol copolymer resin (vinyl content is 48wt%) C are co-extruded through an extruder , meet at the five-layer die head to form a resin melt with A / B / C / B / A structure, and form a resin sheet with A / B / C / B / A structure after being cooled by a chill roll at 30°C ;Introduce the resin sheet into the longitudinal stretching device in the biaxial stretching equipment, after preheating at 120°C, stretch it 4.5 times at 80°C, and then enter the transverse stretching equipment, after preheating at 130°C, Stretch 9 times at 120°C, and then shape at 125°C to form a high-barrier biaxially oriented polyethylene film with A / B / C / B / A structure. The film is wound up after surface corona treatment, and the...

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Abstract

The invention discloses a high-barrier bi-directionally stretched polythene film and a preparation method thereof. The high-barrier bi-directionally stretched polythene film comprises a polythene structural layer, an ethane-ethenol copolymer blocking layer and a agglutinating resin layer set between the polythene structural layer and the ethane-ethenol copolymer blocking layer. The polythene structural layer, the agglutinating resin layer and the ethane-ethenol copolymer blocking layer are bi-directionally stretched by co-extrusion to form a film. The high-barrier bi-directionally stretched polythene film of the invention has excellent blocking property and mechanical property as well as high mechanical strength and stiffness.

Description

technical field [0001] The invention relates to a polyethylene film and a preparation method thereof, in particular to a high-barrier biaxially stretched polyethylene film and a preparation method thereof. Background technique [0002] Polyethylene (PE) film is widely used in general moisture-proof packaging and frozen food for food, medicine, daily necessities and metal products due to its good water resistance, moisture resistance, drought resistance, chemical stability, thermal viscosity and heat sealing performance. package of. Due to the fast crystallization rate and high crystallinity of polyethylene, it is mainly produced by blow molding or casting processes at present, but the mechanical properties of polyethylene films produced by these two processes are poor, and the thickness of the film needs to be increased to meet the application requirements. Biaxially oriented polyethylene film is made of linear low-density polyethylene (LLDPE), which is stretched longitudin...

Claims

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Application Information

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IPC IPC(8): B32B27/08B32B27/18B32B27/30B32B27/32B32B7/12B65D65/40B29C69/02B29L7/00
CPCB29C69/02B32B27/08B32B27/18B32B27/30B32B27/32B32B2260/046B65D65/40
Inventor 郭鹏朱健民
Owner GUANGDONG DECRO FILM NEW MATERIALS
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