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Preparation method of high-toughness polylactic acid membrane

A technology of polylactic acid and high toughness, which is applied in the field of preparation of high toughness polylactic acid film, can solve the problems of brittle fracture, low crystallinity and poor toughness of polylactic acid film, and achieve high crystallinity, good toughness, and preparation steps simple effect

Inactive Publication Date: 2017-02-01
CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the disadvantages of low crystallinity, poor toughness and brittle fracture of the current polylactic acid film, a method for modifying montmorillonite by cetyltrimethylammonium bromide is provided. , to prepare organic modified montmorillonite for later use, then take nano-crystalline cellulose, paraformaldehyde, etc., stir and mix, centrifuge to obtain a precipitate, wash and dry, mix with spare organic modified montmorillonite, etc., extrude and granulate to obtain a material Masterbatch, method for preparing high-toughness polylactic acid film by extrusion blow molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] First, weigh 20g of montmorillonite, put it in a mortar and grind it through a 200-mesh sieve. Add the sieved montmorillonite powder and 6.2g of cetyltrimethylammonium bromide to 500mL of deionized water. Stir at 500r / min and heat to 80°C for 1h, then filter, wash the filter residue with deionized water 3 times, then place the filter residue in a vacuum drying oven and dry at 90°C for 8h to obtain organically modified montmorillonite. Standby; Weigh 5.4g nanocrystalline cellulose, 3.6g paraformaldehyde, add 160mL dimethyl sulfoxide, stir at 300r / min for 20min under a constant temperature water bath at 105℃, then add 54mL tert-amyl alcohol, 3.5 g glyceride hydrolase, 6.0g vinyl propionate, 3.6g vinyl laurate, stirred at 180r / min for 8h under a constant temperature water bath at 40℃, then transferred to a centrifuge, centrifuged at 8000r / min for 3min, and collected Precipitate, wash the precipitate twice with absolute ethanol, then place the precipitate in a vacuum drying ...

example 2

[0017] First, weigh 22g of montmorillonite, put it in a mortar and grind it through a 200-mesh sieve. Add the sieved montmorillonite powder and 6.8g cetyltrimethylammonium bromide to 550mL of deionized water. Stir at 550r / min and heat to 85°C for 2h, then filter, wash the filter residue with deionized water 4 times, then place the filter residue in a vacuum drying oven and dry at 95°C for 9h to obtain organically modified montmorillonite. Standby; Weigh 5.7g nanocrystalline cellulose, 3.8g paraformaldehyde, add 170mL dimethyl sulfoxide, stir at 350r / min for 25min under a constant temperature water bath at 108℃, then add 57mL tert-amyl alcohol, 3.7 g glyceride hydrolase, 6.8g vinyl propionate, 3.8g vinyl laurate, stirred at 190r / min for 9h under a constant temperature water bath at 45℃, then transferred to a centrifuge, centrifuged at 10000r / min for 4min, and collected Precipitate, wash the precipitate 3 times with absolute ethanol, then place the precipitate in a vacuum drying ...

example 3

[0019] First, weigh 24g of montmorillonite, put it in a mortar and grind it through a 200-mesh sieve. Add the sieved montmorillonite powder and 7.5g of cetyltrimethylammonium bromide to 600mL of deionized water. Stir at 600r / min and heat to 90°C for 2h, then filter, wash the filter residue with deionized water 5 times, then place the filter residue in a vacuum drying oven and dry at 100°C for 10h to obtain organically modified montmorillonite. Standby; Weigh 6.0g nanocrystalline cellulose, 4.0g paraformaldehyde, add 180mL dimethyl sulfoxide, stir at 400r / min for 30min under a constant temperature water bath at 110℃, and then add 60mL tert-amyl alcohol, 3.9 g glyceride hydrolase, 7.5g vinyl propionate, 4.0g vinyl laurate, stirred at 200r / min for 10h under a constant temperature water bath at 50℃, then transferred to a centrifuge, centrifuged at 12000r / min for 5min, and collected Precipitate, wash the precipitate 3 times with absolute ethanol, then place the precipitate in a vacu...

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Abstract

The invention discloses a preparation method of a high-toughness polylactic acid membrane, and belongs to the technical field of polylactic acid membrane preparation. The method includes the steps of modifying montmorillonite by cetyl trimethyl ammonium bromide to prepare organic modified montmorillonite for use, taking nano crystalline cellulose, paraformaldehyde and the like to be stirred and mixed and then centrifuged to obtain precipitates, washing and drying the precipitates, making the precipitates, the organic modified montmorillonite for use and the like mixed, extruded and granulated to prepare a material master batch, and conducting extrusion-blow molding to prepare the high-toughness polylactic acid membrane. The method has the advantages that the preparation steps are simple, the obtained polylactic acid membrane is high in crystallinity, and the polylactic acid membrane has good toughness and is free of brittle fractures after being used.

Description

Technical field [0001] The invention relates to a method for preparing a high-toughness polylactic acid film, and belongs to the technical field of polylactic acid film preparation. Background technique [0002] With the depletion of petrochemical resources and the generation of large amounts of plastic waste, environmental and resource issues have attracted increasing attention. Aliphatic polyesters that have biomass sources and are easily decomposed by microorganisms or active enzymes, such as polylactic acid, polycaprolactone and other degradable polymers, have attracted widespread attention. Among them, polylactic acid is the most in-depth research. Polylactic acid (PLA), also known as polylactide, is a biodegradable thermoplastic polyester obtained from corn, wheat, tapioca and other starches as the initial raw material, which is decomposed by enzymes to obtain glucose, which is then fermented by lactic acid bacteria to become lactic acid, and finally chemically synthesized....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/14C08K9/04C08K3/34B29D7/01
CPCC08L67/04B29D7/01C08J5/18C08J2367/04C08J2467/04C08L2203/16C08L2205/025C08L2205/035
Inventor 高玉梅邹宇帆宋豪
Owner CHANGZHOU YAHUAN ENVIRONMENTAL PROTECTION TECH
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