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Polylactic acid modifier, method for preparing modified polylactic acid and modified polylactic acid

A technology of polylactic acid and modifier, which is applied in the field of polylactic acid modifier and preparation of modified polylactic acid, which can solve the problems of low production efficiency and molecular weight reduction of polylactic acid, and improve impact strength, tensile strength and elongation at break. Improvement of elongation rate and effect of expanding application range

Active Publication Date: 2022-02-08
COFCO GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above problems, the present invention adopts a specific polylactic acid modifier to prepare modified polylactic acid through the method of melt online polymerization, which not only overcomes the problem of low production efficiency during processing, but also obtains impact strength, tensile strength and fracture strength. Modified polylactic acid with improved elongation, and avoids the phenomenon that the addition of modifiers usually leads to the reduction of polylactic acid molecular weight

Method used

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  • Polylactic acid modifier, method for preparing modified polylactic acid and modified polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 100kg of lactide into the reaction kettle, then add stannous octoate as a catalyst, carry out polymerization reaction under nitrogen protection, heat up to 150°C, carry out polymerization reaction, carry out monomer removal reaction after polymerization, and obtain unmodified permanent polylactic acid melt.

[0053] Then, the obtained polylactic acid melt was modified in a vacuum state. The modification process is as follows: 4,6-diphenylthiophene [3,4-D]-1,3 -Dioxo-2-keto-5,5-dioxide was added to the above-mentioned unmodified polylactic acid melt for polymerization reaction, the reaction temperature was adjusted to 180°C, the vacuum degree was 30Pa, and the temperature was kept for 4 hours to obtain Modified polylactic acid.

[0054] After testing, its notched impact strength is 5.1kJ / m 2 ; The tensile strength is 56.3MPa; the elongation at break is 22.3%.

Embodiment 2

[0056] Add 10kg of lactide into the reaction kettle, then add stannous octoate as a catalyst, carry out polymerization reaction under the protection of nitrogen, heat to 150°C to carry out polymerization reaction, and carry out monomer removal reaction after polymerization to obtain unmodified polylactic acid melt.

[0057] Then, the obtained polylactic acid melt was modified in a vacuum state. The modification process is as follows: 4,6-diphenylthiophene [3,4-D]-1,3 -Dioxo-2-keto-5,5-dioxide is added to the above-mentioned unmodified polylactic acid melt for polymerization reaction, the reaction temperature is adjusted to 180°C, the vacuum degree is 20Pa, and the temperature is kept for 9 hours to obtain Modified polylactic acid.

[0058] After testing, its notched impact strength is 6.9kJ / m 2 ; Tensile strength of 55.2MPa; elongation at break of 56%.

Embodiment 3

[0060] Add 100kg of lactide into the reaction kettle, then add stannous octoate as a catalyst, carry out polymerization reaction under nitrogen protection, heat up to 150°C for polymerization reaction, and carry out monomer removal reaction after polymerization to obtain unmodified polylactic acid melt.

[0061] Then, the obtained polylactic acid melt was modified in a vacuum state. The modification process is as follows: 4kg of nano-titanium dioxide, 4kg of epoxidized soybean oil, 4kg of tributyl citrate and 4kg of 4,6-diphenylthiophene [3,4-D]-1,3-diox Substituted-2-ketone-5,5-dioxide was added to the above-mentioned unmodified polylactic acid melt for polymerization reaction, the reaction temperature was adjusted to 180°C, the vacuum degree was 20Pa, and the temperature was kept for 9 hours to obtain the modified polylactic acid. lactic acid.

[0062] After testing, its notched impact strength is 9.8kJ / m 2 ; The tensile strength is 53.6MPa; the elongation at break is 102...

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Abstract

The invention provides a polylactic acid modifier, a method for preparing modified polylactic acid and modified polylactic acid. The polylactic acid modifier of the present invention contains a toughening agent, a plasticizer, a branching agent and an antihydrolysis agent. The present invention also relates to a method for preparing high-performance modified polylactic acid. The method is to add the modifying agent into unmodified polylactic acid melt, and carry out online polymerization reaction of the melt under vacuum to obtain modified polylactic acid. . The modified polylactic acid obtained by the invention has excellent impact strength, tensile strength and elongation at break, which broadens the application range of the polylactic acid.

Description

technical field [0001] The invention relates to a polylactic acid modifier, a method for preparing modified polylactic acid and the modified polylactic acid, belonging to the field of polymer materials. Background technique [0002] With the rapid development of the national economy, the use of polymer materials has penetrated into all areas of people's lives, bringing great convenience to our lives, especially plastic film materials, which are widely used. However, traditional plastic film materials are mainly prepared from petroleum bases (such as polypropylene, polyethylene, etc.) as raw materials. Thin film materials made of such materials are discarded in nature after use and are difficult to degrade, resulting in serious environmental pollution problems. With the increasing shortage of petroleum resources, people's high attention to environmental issues and the improvement of life quality requirements, the development of fully biodegradable polymer materials has becom...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L91/00C08K3/22C08K5/11C08K5/45C08G63/08
CPCC08G63/08C08L67/04C08K2003/2241C08K2201/011C08L91/00C08K3/22C08K5/11C08K5/45
Inventor 佟毅杨凯白岚李义潘喜春王宇关阳
Owner COFCO GROUP
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