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Polylactic acid plasticizer and preparation method thereof

A plasticizer, polylactic acid technology, applied in the toughening and modification of polylactic acid transparent products, and the field of polylactic acid plasticizers, can solve the problems of high brittleness of polylactic acid resin, limited application scope, poor toughness, etc. Elongation at break, improvement in processability, effect of lowering glass transition temperature

Active Publication Date: 2021-06-11
河南正通食品科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high brittleness and poor toughness of polylactic acid resin, the scope of application is limited

Method used

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  • Polylactic acid plasticizer and preparation method thereof
  • Polylactic acid plasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] With 512Kg of measured lactic acid (mass percentage content 88%), dehydrate under vacuum at a temperature of 70-80°C, then add 1Kg of magnesium oxide, and continue to gradually increase the temperature under vacuum to 150-170°C, Carry out polycondensation reaction, stop reaction when water yield is 70-80Kg. Add 95Kg of glycerin, add 0.4Kg of sodium hydroxide, and keep the temperature at about 170°C under vacuum to carry out the esterification reaction until the acid value is less than 2mgKOH / g, then stop the reaction, and the reaction time is about 6 hours. After the reaction, the unreacted glycerin, lactic acid, free polylactic acid and water are distilled off by a thin film evaporator, the distillation temperature is 170-175°C, and the vacuum is 80-150Pa.

[0018] Put 150kg of acetic acid and 450Kg of distilled polylactide glyceride into the reaction kettle again, add 0.5Kg of phosphoric acid, gradually raise the temperature to 130-140°C under vacuum, and carry out th...

Embodiment 2

[0020] Take 800Kg of measured lactic acid (mass percentage 88%), dehydrate under vacuum at a temperature of 70-80°C, then add 1.1kg of calcium oxide, and continue to gradually increase the temperature under vacuum to 150-170°C , carry out polycondensation reaction, and stop the reaction when the water output is 35-40Kg. Add 90Kg of glycerin, add 0.5kg of potassium hydroxide, and keep the temperature at about 170°C under vacuum to carry out the esterification reaction until the acid value is less than 2mgKOH / g, then stop the reaction, and the reaction time is about 5.5 hours. After the reaction, the unreacted glycerin, lactic acid, free polylactic acid and water are distilled off by a thin film evaporator, the distillation temperature is 170-175°C, and the vacuum is 100-150Pa.

[0021] Put 150kg of acetic acid and 240Kg of distilled polylactide glyceride into the reaction kettle again, add 0.5Kg of p-toluenesulfonic acid again, gradually raise the temperature to 130-140°C under...

Embodiment 3

[0023] Take 800Kg of measured lactic acid (mass percentage 88%), dehydrate under vacuum at a temperature of 70-80°C, then add 1.2Kg of magnesium oxide, and continue to gradually increase the temperature under vacuum to 150-170°C , carry out polycondensation reaction, and stop the reaction when the water output is 35-40Kg. Add 90Kg of glycerin, add 0.4Kg of potassium hydroxide, and keep the temperature at about 170°C under vacuum to carry out the esterification reaction until the acid value is less than 2mgKOH / g, then stop the reaction, and the reaction time is about 7 hours. After the reaction, the unreacted glycerin, lactic acid, free polylactic acid and water are distilled off by a thin film evaporator, the distillation temperature is 170-175°C, and the vacuum is 150-250Pa.

[0024] Put 180kg of butyric acid and 240Kg of distilled polylactin glyceride into the reaction kettle respectively, add 0.5Kg of phosphoric acid again, gradually raise the temperature to 130-140°C under...

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Abstract

The invention discloses a polylactic acid plasticizer and a preparation method thereof, and belongs to the field of plastic additives. By utilizing a shielding effect generated by mutual coupling of polar groups, the glass transition temperature of the polylactic acid is reduced, the elongation at break of the polylactic acid is improved, and the flexibility of the polylactic acid is improved. The fatty acyl polylactide glyceride is prepared from lactic acid, glycerol, fatty acid and other raw materials through copolymerization reaction, esterification reaction, distillation refining and other processes. The composition is a mixture with a structure shown in the specification.

Description

technical field [0001] The invention relates to a polylactic acid plasticizer, which is especially suitable for toughening and modifying polylactic acid transparent products, and belongs to the field of plastic additives. Background technique [0002] Petroleum-based materials are the most important materials in the modern chemical industry. Although they have created value for people's lives and provided convenience, the "white pollution" problem has seriously polluted the environment and affected human health. Therefore, countries all over the world have launched the implementation of white pollution prevention Currently, more than 100 countries and regions have put forward policies of "plastic restriction" and "plastic ban". The European Union's legislation to ban plastic bags will come into effect in 2021, and many provinces in my country have issued implementation plans for banning plastic bags. [0003] Polylactic acid (PLA) is a bio-based polymer material, which is b...

Claims

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Application Information

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IPC IPC(8): C08G63/91C08L67/04
CPCC08G63/912C08L67/04C08L2205/025Y02W90/10
Inventor 楚喆李兴伟曹益恒楚军政
Owner 河南正通食品科技有限公司
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