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High strength polylactic acid thin film and preparation method thereof

A polylactic acid and high-strength technology, applied in the field of high-strength polylactic acid film and its preparation, can solve the problems of low elongation at break and lack of large-scale industrial application, and achieve tensile strength and elongation at break Improved effect

Inactive Publication Date: 2011-11-16
邹俊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polylactic acid films produced by the above disclosed methods still have the problem of low elongation at break, and the films produced by these methods still have practical defects when applied to finished products, so large-scale industrial applications have not yet been obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh 80 parts of polylactic acid and 16 parts of modified nano-scale silicon dioxide, and dry these two raw materials respectively. The modified nano-scale silica refers to nano-scale silica particles, which are modified by adding one or more mixtures including sodium stearate, calcium stearate, and silane coupling agent as modifiers. The same is true for the following examples, so no repeated explanation is required;

[0031] (2) Use a high-speed mixer to mix the dried polylactic acid and modified nano-scale silicon dioxide, then add 2.5 parts of plasticizer, 0.6 part of antioxidant, and 0.9 part of lubricant, and fully mix until uniform;

[0032] (3) adding the mixed material to a twin-screw extruder for melt blending, stranding, and pelletizing to obtain granular mixed resin;

[0033] (4) Carrying out dehydration drying treatment to granular mixed resin;

[0034] (5) Pass the treated granular mixed resin through a single-screw extruder to blow-molded polylacti...

Embodiment 2

[0036] (1) Take 85 parts of polylactic acid and 11 parts of modified nano-scale silicon dioxide, and dry these two raw materials respectively;

[0037] (2) Use a high-speed mixer to mix the dried polylactic acid and modified nano-scale silicon dioxide, then add 2.5 parts of plasticizer, 0.6 part of antioxidant, and 0.9 part of lubricant, and fully mix until uniform;

[0038] (3) adding the mixed material to a twin-screw extruder for melt blending, stranding, and pelletizing to obtain granular mixed resin;

[0039] (4) Carrying out dehydration drying treatment to granular mixed resin;

[0040] (5) Pass the treated granular mixed resin through a single-screw extruder to blow-molded polylactic acid film.

Embodiment 3

[0042] (1) Take 90 parts of polylactic acid and 6 parts of modified nano-scale silicon dioxide, and dry these two raw materials respectively;

[0043] (2) Use a high-speed mixer to mix the dried polylactic acid and modified nano-silicon dioxide, then add 2.5 parts of plasticizer, 0.6 part of antioxidant, and 0.9 part of lubricant, and fully mix until uniform;

[0044] (3) adding the mixed material to a twin-screw extruder for melt blending, stranding, and pelletizing to obtain granular mixed resin;

[0045] (4) Carrying out dehydration drying treatment to granular mixed resin;

[0046] (5) Blow molding the processed granular mixed resin through a single-screw extruder to produce a polylactic acid film.

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PUM

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Abstract

The invention provides a high strength polylactic acid thin film and a preparation method thereof. The thin film comprises: by weight, 80 to 93 parts of polylactic acid, 3 to 16 parts of a modified nanoscale silica, 0 to 5 parts of one or more plasticizers, 0 to 2 parts of one or more anti-oxidants, and 0 to 2 parts of one or more lubricants. The modified nanoscale silica is prepared through the process that nanoscale silica particles are mixed with one or more modifiers of sodium stearate, calcium stearate and silane coupling agent and are modified by the one or more modifiers. The polylactic acid thin film is biodegradable, has an improved greatly tensile strength and a breaking elongation rate, can be utilized directly in the preparation of finished products such as food packaging bags, vest bags, agricultural thin film materials and the like, and can be utilized widely in the field such as a sheet material field where a flexibility requirement is high.

Description

technical field [0001] The invention relates to a high-strength polylactic acid film and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] In the past, people have widely used polyethylene and polypropylene films as raw materials. Most of these films are applied to the packaging of food, groceries, machinery, electronics, and cosmetics. They are discarded after use and generally do not degrade, resulting in White garbage, because these raw materials have high calorific value, will damage the combustion furnace when incinerated. [0003] Polylactic acid (poly-2-hydroxypropionate) is a new type of bio-based degradable material, which is produced by fermentation of starch sugar and can be completely biodegraded under composting conditions. Compared with traditional petroleum-based plastics, it has the advantages of low-carbon environmental protection, non-toxic and harmless to human body. The biodegradable prope...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K13/06C08K9/04C08K9/06C08K3/36B29C47/92B29C48/92
CPCB29C48/0022B29C48/04
Inventor 邹俊
Owner 邹俊
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