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Antistatic biaxially-oriented polylactic acid film and preparation method thereof

A biaxially stretched, polylactic acid technology is applied in the field of antistatic biaxially stretched polylactic acid film and its preparation to achieve the effects of improving elongation at break, improving optical properties and reducing haze

Active Publication Date: 2020-06-12
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Ester-based quaternary ammonium salt is a new type of cationic surfactant, which is easy to biodegrade, has excellent antistatic, anti-yellowing, bactericidal properties, and is environmentally friendly. It is currently mainly used for antistatic and soft treatment of textiles. Found that there are reports of antistatic agents for thin films

Method used

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  • Antistatic biaxially-oriented polylactic acid film and preparation method thereof
  • Antistatic biaxially-oriented polylactic acid film and preparation method thereof
  • Antistatic biaxially-oriented polylactic acid film and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] Get polylactic acid and bis(palmyl carboxyethyl) hydroxyethyl methyl sulfate methyl ester salt (that is, the quaternary ammonium salt of the structure shown in formula (a), wherein R represents palmitic acid) and mix uniformly in a weight ratio of 9:1 Finally, use a twin-screw extruder to extrude and granulate at 250°C to obtain an antistatic masterbatch with an ester-based quaternary ammonium salt content of 10%; take 1kg of antistatic masterbatch and 9kg of polylactic acid and mix them evenly and send them through the twin-screw Extruded by extruder (extruder temperature is 150°C, die head temperature is 220°C), cooled cast sheet (35°C), and then stretched vertically and horizontally asynchronously 3.5×3.5 times (100°C) to obtain ester group A BOPLA film with a quaternary ammonium content of 1% and a thickness of 25 μm.

Embodiment 2

[0026] Get polylactic acid and bis(palmyl carboxyethyl) hydroxyethyl methyl sulfate methyl ester salt (that is, the quaternary ammonium salt of the structure shown in formula (a), wherein R represents palmitic acid) and mix uniformly in a weight ratio of 4:1 Finally, use a twin-screw extruder to extrude and granulate at 230°C to obtain an antistatic masterbatch with an ester-based quaternary ammonium salt content of 20%; take 1kg of antistatic masterbatch and 9kg of polylactic acid and mix them evenly and send them through the twin-screw Extruded by extruder (extruder temperature is 150°C, die head temperature is 220°C), cooled cast sheet (35°C), and then stretched vertically and horizontally asynchronously 3.5×3.5 times (100°C) to obtain ester group BOPLA film with 2% quaternary ammonium salt content and 25 μm thickness.

Embodiment 3

[0036] Get polylactic acid and stearamidomethyl sulfate (quaternary ammonium salt of structure shown in formula (b), wherein R represents stearic acid) after mixing uniformly by the weight ratio of 3:1, use twin-screw extruder Extrude and granulate at 200°C to obtain an antistatic masterbatch with an ester quaternary ammonium salt content of 25%; get 1.2kg antistatic masterbatch and 8.8kg polylactic acid and mix them uniformly and send them to extrude through a twin-screw extruder ( The extruder temperature is 150°C, the die head temperature is 220°C), the cast sheet is cooled (35°C), and then stretched vertically and horizontally asynchronously 3.5×3.5 times (100°C) to obtain an ester quaternary ammonium salt content of 3 %, a BOPLA film with a thickness of 25 μm.

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Abstract

The invention discloses an antistatic biaxially-oriented polylactic acid film and a preparation method thereof. The film is prepared from, by weight, 1-3.5% of an ester-based quaternary ammonium salt,and the balance of polylactic acid. The preparation method comprises the following steps: uniformly mixing the ester-based quaternary ammonium salt and part of polylactic acid, and carrying out extrusion granulation to obtain an antistatic master batch; and uniformly mixing the obtained antistatic master batch with the remaining polylactic acid, extruding, cooling, casting and biaxially stretching to obtain the antistatic biaxially-oriented polylactic acid film. The ester-based quaternary ammonium salt with a specific structure is selected as an antistatic agent to be applied to the PLA film,so that the elongation at break and glossiness of the obtained film are improved while the antistatic effect is achieved, the haze is reduced, and the optical performance of the obtained film is improved to a great extent.

Description

technical field [0001] The invention relates to a biaxially stretched polylactic acid film, in particular to an antistatic biaxially stretched polylactic acid film and a preparation method thereof. Background technique [0002] The demand for biodegradable plastics is increasing due to the increasing problems of "white waste" and the shortage of petroleum resources and environmental pollution caused by traditional plastics. Polylactic acid (PLA) is regarded as the most promising biodegradable plastic because of its outstanding characteristics such as good processability, mechanical properties, transparency, and sufficient and renewable raw material sources. [0003] After biaxially stretched polylactic acid (BOPLA) film, its tensile strength, elongation at break, light transmittance, gloss and other properties will be greatly improved. However, BOPLA film is an insulating material with excellent insulation properties, and its surface resistivity is as high as 10 5 -10 6 Ω...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/41C08J5/18C08J3/22
CPCC08J5/18C08J3/226C08J2367/04C08J2467/04C08K5/41C08K2201/017
Inventor 陈志平冯羽风黄永生陆春立
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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