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Environment-friendly polylactic resin prepared in presence of improved catalyst and application of polylactic resin

A technology of polylactic acid resin and catalyst, which is applied in plant protection covers, sustainable manufacturing/processing, flexible coverings, etc., can solve the problems of large environmental impact, poor safety performance, low catalytic efficiency, etc., to reduce side reactions, Effects of improving efficiency and regulating reactivity

Inactive Publication Date: 2014-07-16
嘉兴润博化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] What the present invention aims to solve are the defects of low catalytic efficiency, poor safety performance, and large impact on the environment in the synthesis of polylactic acid existing in the prior art.

Method used

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  • Environment-friendly polylactic resin prepared in presence of improved catalyst and application of polylactic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 30mL of raw material lactic acid into a 50mL single-necked flask, set the temperature to 70°C, vacuumize, distill for 7h to remove impurity water, and put it in a dry box for use. Add 10g of purified lactic acid, 0.05g of an appropriate amount of catalyst (neodecanoic acid and bismuth neodecanoate) and a certain amount of solvent 1,4-butanediol into the three-necked flask, and vacuumize with a water pump while raising the temperature. The initial temperature is set to 100°C, and gradually increase the reaction temperature by 10°C every 30min to prevent the reaction liquid from bumping. Control the highest reaction temperature and vacuum degree. After a certain period of time, stop heating, cool to room temperature, and terminate the reaction. Chloroform was added to dissolve, after dissolution, polylactic acid was precipitated by adding absolute ethanol, and dried in a vacuum oven at 50° C. for 24 hours to obtain 9.3 g of white polylactic acid resin.

Embodiment 2

[0024] In a pre-dried three-neck flask filled with argon, add 5 g of dry DL-lactide, vacuumize, blow argon, and add 0.2 mL of catalyst (neodecanoic acid and bismuth neodecanoate) in toluene solution (concentration 3.5 mM ). The toluene was vacuum-dried, sealed under reduced pressure, and reacted in an oil bath at 140°C for 12 hours. The solidified polymer was dissolved in 30 mL of dichloromethane, the precipitated polylactic acid was filtered in methanol, and dried in a vacuum oven at 50° C. for 24 hours to obtain 4.7 g of white polylactic acid resin.

[0025] The acidity of the polylactic acid resins obtained in Examples 1 and 2 was measured. Acidity measurements were performed with a Metrohm 809Titando equipment using 0.1N KOH ethanol solution as the titrant. The results are shown in Table 1.

[0026] Referring to Table 1, the polylactic acid resins of the examples were found to have an acidity of less than 5 meq / kg. These results confirm that the preparation method of t...

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Abstract

The invention provides environment-friendly polylactic resin prepared in the presence of improved catalyst. The environment-friendly polylactic resin is prepared by virtue of a condensation polymerization method and a ring-opening polymerization method with a composition of carboxylic acid and carboxylic acid metal salt as a catalyst as well as a lactic acid monomer and a lactide monomer as raw materials. The environment-friendly polylactic resin does not contain organic tin, lead and organic amine, can be used for manufacturing completely biodegradable fixing and reinforcing materials in the medical field, degradable packing materials in the daily field and agriculturally degradable agricultural films. According to the environment-friendly polylactic resin, as metal salt of organic acid is adopted as the catalyst, the efficiency of polylactic acid synthetic reaction is improved, and the reaction activity is regulated; in addition, as an organic bismuth and zinc catalyst is non-toxic and harmless, the environmental pollution and safety hidden dangers are avoided.

Description

technical field [0001] The invention relates to a polylactic acid resin improved and prepared by an environment-friendly catalyst and its application, belonging to the field of polylactic acid environment-friendly materials. Background technique [0002] Entering the 21st century, the issue of green environmental protection has become one of the most concerned topics of the public, and its influence pervades almost all industries, and the food and textile industries are no exception. Polylactic acid is a polymer that can be naturally decomposed by microorganisms in the soil. It can be used to manufacture green and environmentally friendly food packaging materials, medical surgical sutures, absorbable internal fixation for fractures, non-woven fabrics, building materials and various daily necessities, etc. . Polylactic acid (PLA) fiber, which is made from agricultural products such as beets, grains or potatoes, is a more researched, better-performing, biodegradable packa...

Claims

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Application Information

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IPC IPC(8): C08G63/06C08G63/08C08G63/87C08G63/85A61L31/06B65D65/46A01G13/02
CPCY02W90/10
Inventor 倪平陈雷杨玉淳
Owner 嘉兴润博化工科技有限公司
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