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A kind of polylactic acid film and preparation method thereof

A polylactic acid film, polylactic acid technology, which is applied to flat products, other household appliances, household appliances, etc., can solve the problems of high melt flow rate, difficult processing and molding, and large amount of additives, and achieves simple process, easy realization, The effect of improving melt strength

Active Publication Date: 2019-08-16
SHANDONG YONGJU MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the melt strength of polylactic acid is not high, the melt flow rate is high, and it is extremely difficult to process and shape in the film blowing process, so its application is limited to a certain extent.
At present, there are some methods to improve the melt strength of polylactic acid by adding some additives, such as Song Xia et al. in "Research on E-MAH-GMA Blending Toughening Modified PLA" (New Chemical Materials, 2012 No. 40 Volume No. 1: 114-116) Using E-MAH-GMA to toughen modified polylactic acid, Chinese patent CN1027577627A discloses the use of polycarboxy polymers to toughen modified polylactic acid and successfully prepares polylactic acid films, but In the above prior art scheme, the characteristics of polylactic acid itself are affected due to the excessive amount of additives

Method used

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  • A kind of polylactic acid film and preparation method thereof
  • A kind of polylactic acid film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Take 20.9g TRIM and 79.1g GMA (molar ratio 1:9) for polymerization to obtain epoxy-containing copolymer; then place the obtained epoxy-containing copolymer and 99.9kg PLA in a co-rotating twin-screw extruder Mid-melt extrusion and pelletizing. The process conditions are: 230°C in the first zone, 230°C in the second zone, 230°C in the third zone, 240°C in the fourth zone, 240°C in the fifth zone, 240°C in the sixth zone, 240°C in the seventh zone, 245°C in the eight zone, 245°C in the nine zone, The machine head is 245℃, the main engine speed is 110r / min, and the feed speed is 50r / min. The pellets are cut by water-cooled stretch strips. Finally, the pellets are blown into a film by a single-screw extrusion film blowing machine. The process conditions are: the temperature of the three sections of the extruder are 230°C, 240°C, and 245°C, the temperature of the die head is set to 240°C to 250°C, and the traction speed is 5m / min.

Embodiment 2

[0030] Take 75g TRIM and 125g GMA g (molar ratio 1:4) for polymerization to obtain epoxy-containing copolymer; then place the obtained epoxy-containing copolymer and 99.8kg PLA in a co-rotating twin-screw extruder Melt extrusion and pelletizing. The process conditions are: 230°C in the first zone, 230°C in the second zone, 230°C in the third zone, 240°C in the fourth zone, 240°C in the fifth zone, 240°C in the sixth zone, 240°C in the seventh zone, 245°C in the eight zone, 245°C in the nine zone, The machine head is 245℃, the main engine speed is 110r / min, and the feed speed is 50r / min. The pellets are cut by water-cooled stretch strips. Finally, the pellets are blown into a film by a single-screw extrusion film blowing machine. The process conditions are: the temperature of the three sections of the extruder are 230°C, 240°C, and 245°C, the temperature of the die head is set to 240°C to 250°C, and the traction speed is 5m / min.

Embodiment 3

[0032] Take 112.5g TRIM and 187.5g GMA (molar ratio 1:4) for polymerization to obtain epoxy-containing copolymer; then place the obtained epoxy-containing copolymer and 99.7Kg PLA in a co-rotating twin-screw extruder Mid-melt extrusion and pelletizing. The process conditions are: 230°C in the first zone, 230°C in the second zone, 230°C in the third zone, 240°C in the fourth zone, 240°C in the fifth zone, 240°C in the sixth zone, 240°C in the seventh zone, 245°C in the eight zone, 245°C in the nine zone, The machine head is 245℃, the main engine speed is 110r / min, and the feed speed is 50r / min. The pellets are cut by water-cooled stretch strips. Finally, the pellets are blown into a film by a single-screw extrusion film blowing machine. The process conditions are: the temperature of the three sections of the extruder are 230°C, 240°C, and 245°C, the temperature of the die head is set to 240°C to 250°C, and the traction speed is 5m / min.

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Abstract

The invention relates to a polylactic acid film, which is composed of polylactic acid and an oxygen-containing copolymer, wherein the polylactic acid content is 99.5% to 99.9%, and the epoxy-containing copolymer content is 0.1% to 0.5%. The epoxy group-containing copolymer is polymerized by trimethylolpropane trimethacrylate and glycidyl methacrylate. The polylactic acid can effectively improve the melt strength of the polylactic acid, ensure the characteristics of the polylactic acid itself, and the preparation process is simple and easy to implement.

Description

Technical field [0001] The invention relates to a polylactic acid film and a preparation method thereof, and belongs to the field of polymer materials. Background technique [0002] Polylactic acid is made by fermentation and polymerization of natural plants such as corn, wheat and other organic wastes such as lotus, leaves and roots, so it is non-toxic. Moreover, waste polylactic acid products can be completely degraded into carbon dioxide and water under natural conditions, which can effectively reduce the pollution to the ecological environment. [0003] Although polylactic acid has good biocompatibility, air permeability, transparency, good mechanical and physical properties, and is one of the promising renewable polymer materials, polylactic acid is easily hydrolyzed, lacks toughness, and is easily damaged. Therefore, polylactic acid products are mostly composed of polylactic acid combined with other polymer plastic materials. For example, Luo Maochun and others prepared pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L33/14B29C48/92B29L7/00
CPCB29C48/92B29C2948/9258B29C2948/92704B29L2007/00C08J5/18C08J2367/04C08J2433/14C08L67/04C08L2203/16C08L33/14
Inventor 任大勇
Owner SHANDONG YONGJU MEDICAL TECH