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Method for toughening heat-resistant modified polylactic acid with plant-base composite environment-friendly modifier

A heat-resistant modification and modifier technology, which is applied in the field of plant-based composite environmental modifiers for toughening and heat-resistant modified polylactic acid, can solve the problems of increasing market competitiveness, increasing costs, and high costs, and achieves favorable results. The effect of removal, increased reaction speed, excellent nucleation effect

Active Publication Date: 2014-08-06
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of synthesizing the required plasticizer is relatively high, which will easily cause an increase in the cost of the final polylactic acid polymer composition, which is not conducive to increasing its market competitiveness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add castor oil into the polycondensation reactor, dehydrate at 80°C for 2 hours under a vacuum of -0.1MPa, then add adipic acid according to the mass ratio of castor oil: adipic acid = 1:1, and add the nucleating agent phenyl Zinc phosphate, nucleating agent accounts for 2w% of total raw material weight; 2 , and heated to 140 ° C for 8 hours; then add the dehydrated L-lactic acid, according to the amount of material ratio castor oil: adipic acid: L-lactic acid = 1: 1: 1, continue to use N 2 React at 140°C for 2 hours in the atmosphere, then heat up to 170°C for 10 hours, and finally vacuumize, keep the vacuum at -0.1MPa and react for 2 hours. After the reaction is complete, an environmentally friendly modifier polymer is obtained.

[0032] Polylactic acid and modifier polymer were mixed in a high-speed mixer at room temperature for 5 minutes at a mass ratio of 97:3, added to a twin-screw extruder for extrusion and blending, the strands were water-cooled and pelletized, ...

Embodiment 2

[0034] Add epoxidized soybean oil into the polycondensation reaction kettle, dehydrate at 90° C. for 2 hours under a vacuum of -0.1 MPa, then add sebacic acid according to the mass ratio of epoxidized soybean oil: sebacic acid = 1: 3, and simultaneously add synthetic Nucleating agent talcum powder (3000 orders), nucleating agent accounts for 3w% of total raw material weight; System is changed into general N 2 , and heated up to 150 ° C for 5 h; then added D-lactic acid dewatered, according to the amount of substance epoxy soybean oil: sebacic acid: D-lactic acid = 1: 3: 10, continue in N 2 React at 150°C for 2 hours in the atmosphere, then heat up to 180°C for 5 hours, and finally vacuumize, keep the vacuum at -0.1MPa and react for 2 hours. After the reaction is complete, an environmentally friendly modifier polymer is obtained.

[0035] Polylactic acid and modifier polymer were mixed in a high-speed mixer at room temperature for 5 minutes at a mass ratio of 95:5, added to a t...

Embodiment 3

[0037] Castor oil is added in the polycondensation reaction still, dehydration 2h under the vacuum degree of 70 ℃ is-0.1MPa, then add dodecyl diacid according to material mass ratio castor oil: dodecyl diacid=1:10, simultaneously Add nucleating agent talcum powder (8000 order), and nucleating agent accounts for 4w% of total raw material weight; 2 , and heated up to 160 ° C for 2 hours; then add the dehydrated DL-lactic acid, the ratio of castor oil: dodecyl dioic acid: DL-lactic acid = 1: 10: 200, continue in N 2 React at 160°C for 1h in the atmosphere, then heat up to 190°C for 8h, and finally vacuumize, keep the vacuum at -0.1MPa and react for 1h. After the reaction is complete, an environmentally friendly modifier polymer is obtained.

[0038] Polylactic acid and modifier polymer were mixed in a high-speed mixer at room temperature for 5 minutes at a mass ratio of 90:10, added to a twin-screw extruder for extrusion and blending, the strands were water-cooled and pelletized,...

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Abstract

The invention relates to a method for toughening heat-resistant modified polylactic acid with a plant-base composite environment-friendly modifier, which comprises the following steps: removing water from the raw material vegetable oil; proportionally adding polybasic acid / acid anhydride and a nucleating agent, and heating to 140-160 DEG C in an N2 atmosphere to react for 2-8 hours; adding a certain amount of dehydrated lactic acid or lactide, continuing reacting at 140-160 DEG C in the N2 atmosphere for 1-2 hours, heating to 170-190 DEG C to react for 2-10 hours, and vacuumizing the system; and extruding the prepared plant-base environment-friendly modifier polymer and polylactic acid by an equidirectional double screw extruder, blending, drawing, cooling with water, granulating, and drying to obtain the modified polylactic acid granules. Compared with the prior art, the modified polylactic acid granules have the advantages of no toxicity or harm, no harm to the environment and human health and favorable compatibility, and can be completely biodegraded. Besides, the polylactic acid modified by the modifier has favorable heat resistance.

Description

technical field [0001] The invention relates to a material and a method in the technical field of polymer materials, in particular to a method for toughening heat-resistant modified polylactic acid with a plant-based composite environmental modifier. 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. However, most of the commonly used polymer materials are made of petroleum, which are difficult to biodegrade when discarded into the environment after use, thus causing serious environmental pollution problems, such as "white pollution". 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 become a research hotspot at home and abroad. [0003] Polylactic acid (PLA) is conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K5/523C08K3/34C08G63/08C08G63/78B29C47/92B29C48/92
CPCB29B7/46B29B7/72B29B7/7461B29B9/065B29B9/12B29C48/40B29C48/625B29C48/92B29C2948/9259B29C2948/92704
Inventor 袁角亮杨斌王新灵
Owner SHANGHAI JIAO TONG UNIV
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