Biodegradable polyethylene thin film and preparation method thereof

A polyethylene film, biodegradable technology, applied in the direction of bio-packaging, sustainable manufacturing/processing, flexible coverings, etc., can solve the problems of complicated production process, excessive modified substances, and decreased physical properties of the film, and achieve degradation Fast speed and good degradation effect

Active Publication Date: 2013-03-20
蚌埠天成包装科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in order to improve the photosensitivity of polyethylene, inorganic fillers will be added to promote the rapid breakage of macromolecular chains to achieve the purpose of degradation, but to a certain extent, the mechanical properties and transparency of polyethylene will be reduced; direct mechanical blending will lead to a separation between the two phases of the system. lack of adhesion
Chinese patent CN 1785759A uses synthetic paper and polyethylene film to be compounded by adhesive, which enhances the mechanical properties of polyethylene composite film to a certain extent, but the manufacturing process is complicated, and the degradation performance of the product is not good
U.S. Patent US 4133784 uses ethylene-acrylic acid copolymer and starch to modify polyethylene after blending, but due to too many modified substances, the physical properties of the film are reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw material components, that is, contain 47% high-density polyethylene (brand 4000F) by weight, 15% polylactic acid stereocomplex (containing PDLA 1% by weight, the weight average molecular weight of PLLA and PDLA is 100000 , Shenzhen Guanghua Weiye), 5% epoxy soybean oil, 25% starch, and 8% siloxane are put into the twin-screw extruder.

[0021] The parameters of the twin-screw extruder were set as follows:

[0022] Screw speed: 80rpm Length-to-diameter ratio: 44

[0023] The temperature setting of each zone of the barrel is as follows:

[0024] Zone I: 180℃ Zone II: 200℃ Zone III: 230℃ Zone IV: 270℃ Zone V: 280℃ Zone VI: 260℃

[0025] Zone VII: 250°C Head: 275°C

[0026] After the masterbatch is obtained, a blow molding machine is used for blow molding, the material is discharged from the hopper, the masterbatch is extruded upward toward the die head, and a film with a thickness of 25 microns is obtained by air inflation.

[0027] Adopt the composition of pre...

Embodiment 2

[0029] The raw material components, namely containing 40% by weight of high-density polyethylene (brand 4000F), 25% of polylactic acid stereocomplex (weight-average molecular weight is 150,000, containing 4% by weight of PDLA, Shenzhen Guanghua Weiye) , 5% epoxy sunflower oil, 25% starch, and 5% ethylene-acrylic acid copolymer are put into a twin-screw extruder.

[0030] The parameters of the twin-screw extruder were set as follows:

[0031] Screw speed: 80rpm Length-to-diameter ratio: 44

[0032] The temperature setting of each zone of the barrel is as follows:

[0033] Zone I: 190°C Zone II: 210°C Zone III: 230°C Zone IV: 260°C Zone V: 280°C Zone VI: 270°C

[0034] Zone VII: 260°C Head: 260°C

[0035] After the masterbatch is obtained, a blow molding machine is used for blow molding, the material is discharged from the hopper, the masterbatch is extruded upward toward the die head, and a film with a thickness of 35 microns is obtained by air inflation.

[0036] Adopt the...

Embodiment 3

[0038] The raw material components, namely containing 50% by weight of high-density polyethylene (brand 4000F), 20% of polylactic acid stereocomplex (weight-average molecular weight is 120000, containing 6% by weight of PDLA, Shenzhen Guanghua Weiye) , 5% epoxy linseed oil, 22% starch, and 3% maleic anhydride drop into a twin-screw extruder.

[0039] The parameters of the twin-screw extruder were set as follows:

[0040] Screw speed: 80rpm Length-to-diameter ratio: 44

[0041] The temperature setting of each zone of the barrel is as follows:

[0042] Zone I: 190°C Zone II: 220°C Zone III: 240°C Zone IV: 260°C Zone V: 280°C Zone VI: 260°C

[0043] Zone VII: 260°C Head: 250°C

[0044] After the masterbatch is prepared, use a blow molding machine for blow molding. The material is discharged from the hopper, and the masterbatch is extruded upward toward the die head to form a film with a thickness of 50 microns by air inflation.

[0045] Using the composition of this example, ...

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Abstract

The invention relates to a biodegradable polyethylene thin film and a preparation method thereof. The biodegradable polyethylene thin film is prepared from the following raw materials in percentage by weight: 40-55% of high-density polyethylene, 10-30% of polylactic acid stereoregular composite, 3-25% of epoxy vegetable oil, 15-35% of starch and 3-15% of compatibilizer. The biodegradable polyethylene thin film provided by the invention has stable mechanical properties, is suitable for the packaging field, and can be degraded in natural environment after being discarded.

Description

technical field [0001] The invention belongs to the technical field of plastic packaging materials, and in particular relates to a biodegradable polyethylene film and a preparation method thereof. Background technique [0002] With the acceleration of the pace of life, social life is developing towards convenience and sanitation. Plastic packaging products frequently enter people's daily life. The appearance of these easy-to-use and cheap packaging materials has brought many conveniences to people's lives. But on the other hand, these packaging materials cause " white pollution " after use and form environmental hazard. Among them, polyethylene (PE) is the most important plastic raw material, and its products are widely used in fields such as agricultural mulch film and packaging materials. However, its pollution to the environment has also become prominent. Therefore, it is of great practical significance to modify polyethylene to make it a degradable material to reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L67/04C08L3/02C08K5/1515B65D65/46
CPCY02W90/10
Inventor 任柏成李淑珍任鹏李振江陈林
Owner 蚌埠天成包装科技股份有限公司
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