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Industrial Production of Polylactic Acid

  • Author:Junqian Nonwoven
  • Source:Junqian Nonwoven
  • Release on:2019-08-14
Polylactic acid is produced by using lacticacid as a raw material. Most of the traditional lactic acid fermentation usesstarchy raw materials. Currently, the United States, France, Japan and othercountries have developed the use of agricultural and sideline products as rawmaterials to produce lactic acid, and then produce polylactic acid.

The process of producing polylactic acid(PLA Non Woven Fabric On Sales) by American LLC company is as follows: corn starch is hydrolyzed into glucose, andthen lactic acid is used for anaerobic fermentation. The fermentation processis neutralized with liquid alkali to form lactic acid. After the fermentationliquid is purified, the purity is 99 by electrodialysis. .5% L-lactic acid. The PLA production process by lactic acid has: (1) direct polycondensation method,and dehydration polycondensation is carried out using a solvent under vacuum.(2) A non-solvent method in which lactic acid is formed into a cyclic dimerlactide and is subjected to ring-opening polycondensation into PLA.

A research institute in the United States successfully developed the waste potato after cheese production into glucosesyrup, and then fermented it into a lactic acid-containing yeast solution byelectrolysis, and separated by electrodialysis to evaporate the water to obtaina polylactic acid capable of forming a film and a coating. As a fresh-keeping bag and a packaging material instead of polyethylene and waterproof wax.

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France's Erstein Sugar Factory and auniversity have developed beet as a raw material, first decomposed intomonosaccharides, fermented to produce lactic acid, and then chemically polymerized lactic acid into polylactic acid, and can also use the industrial sugar process to waste the sugar. The liquid is used to produce polylacticacid, and the production cost is greatly reduced.

Japan Bell Textile Co., Ltd. ferments polylactic acid(Degradable Nonwovens Vendor) from corn as raw material, and uses polylactic acid to make biodegradable foaming materials. The process involves mixing a special additiveinto the polylactic acid, controlling its molecular structure to becomeeasy-foaming particles, and adding an organic compound foaming agent usingcarbohydrates to form in a molding machine. The high pressure steam is heatedto form a foamed material. The strength compressive stress, cushioningproperty, and chemical resistance of the material are the same as those of polystyrene plastic, and do not pollute the environment after incineration, andcan also fertilize the field.

According to relevant media reports, Hycail Materials Industries, a European biodegradable plastics manufacturer, has recently made break throughs in improving the development and production ofpolylactic acid (PLA) temperature resistance.

The poor temperature resistance of PLA materials(Environmentally Friendly Non-Woven Factory) has always been a difficult problem to solve, and the newlyintroduced HycailXM1020 material can withstand temperatures of 200 °C without deformation, even ifthe materials containing fat and liquid foods are not deformed or damaged bymicrowave heating, can withstand The microwave was heated at 205 °C for 30 minutes. At present,HycailPLA's production facilities in the Netherlands have produced hundreds oftons per year, and Hycail is preparing to build large plants with a capacity ofat least 25,000 tons per year.