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Toughened polylactic acid and preparation method thereof

A polylactic acid and toughening technology, applied in the field of toughened polylactic acid and its preparation, can solve the problems of weakening the advantages of polylactic acid, poor impact resistance, and low elongation at break

Active Publication Date: 2015-04-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although polylactic acid has many excellent properties, its own strong brittleness, poor impact resistance, and low elongation at break have seriously restricted its application in general-purpose plastics, and the addition of some commonly used plasticizers, Such as dioctyl terephthalate, polyethylene glycol, glycerin, etc., have improved its toughness, but these plasticizers will gradually migrate to the surface during use and lose their plasticizing effect, so that the plasticized poly Lactic acid materials do not have long-term stability
In addition, polylactic acid, as a bio-based plastic, has a significant feature that its production does not depend on petrochemical resources. However, most of the toughening agents used in toughened polylactic acid are petrochemical resource products. In today's large-scale shortage of petrochemical resources Under environmental conditions, this undoubtedly weakens the advantages of polylactic acid as a bio-based material, which is a major shortcoming of toughened polylactic acid today.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dehydration treatment of 1,10-sebacic acid: put a certain mass of 1,10-sebacic acid in a vacuum oven, and place it at 60° C. under vacuum for 24 hours to constant weight.

[0031] Synthesis of polyester elastomer: add a certain amount of lactic acid, 1,4-butanediol, 1,10-sebacic acid, itaconic acid in a three-necked flask, the molar ratio is 4:3:2.5:0.5, and It is a polymerization inhibitor 705 with 0.1% of the total mass of the above monomers. The reaction temperature of the control system is 130 ° C. After 1 hour of reaction, the temperature is raised to 180 ° C. After 2 hours of reaction, the temperature of the system is lowered to 100 ° C. Add 0.1 wt of the total mass of the above reaction monomers % tetrabutyl titanate catalyst, then heated up to 210° C., and reacted under vacuum conditions for 8 hours to obtain a polyester elastomer, which was placed in a sealed drying tower for later use.

[0032] Blend ratio: Polylactic acid and polyester elastomer are melt blen...

Embodiment 2

[0037] The dehydration treatment of 1,10-sebacic acid: same as embodiment 1.

[0038] Synthesis of polyester elastomer: Synthesis of polyester elastomer: add a certain amount of lactic acid, 1,4-butanediol, 1,10-sebacic acid, itaconic acid in a three-necked flask, the molar ratio is 4: 3:2.5:0.5, and the polymerization inhibitor 705 which is 0.1% of the total mass of the above-mentioned monomers, the reaction temperature of the control system is 150°C, the temperature is raised to 200°C after 1 hour of reaction, and the temperature of the system is lowered to 100°C after 2 hours of reaction, adding the above A tetrabutyl titanate catalyst with a total monomer mass of 0.1 wt% was heated up to 230° C., and reacted under vacuum for 8 hours to obtain a polyester elastomer, which was placed in a sealed drying tower for later use.

[0039] The proportioning of blend: with embodiment 1.

[0040] Preparation of blend: same as Example 1.

[0041] Preparation of test sample: same as E...

Embodiment 3

[0043] The dehydration treatment of 1,10-sebacic acid: same as embodiment 1.

[0044] Synthesis of polyester elastomer: Synthesis of polyester elastomer: add a certain amount of lactic acid, 1,4-butanediol, 1,10-sebacic acid, itaconic acid in a three-necked flask, the molar ratio is 4: 3:2.5:0.5, and the polymerization inhibitor 705 which is 0.1% of the total mass of the above-mentioned monomers, the reaction temperature of the control system is 140°C, the temperature is raised to 190°C after 1 hour of reaction, and the temperature of the system is lowered to 100°C after 2 hours of reaction, adding the above A tetrabutyl titanate catalyst with a total monomer mass of 0.1 wt% was heated up to 220° C., and reacted under vacuum conditions for 8 hours to obtain a polyester elastomer, which was placed in a sealed drying tower for later use.

[0045] The proportioning of blend: with embodiment 1.

[0046] Preparation of blend: same as Example 1.

[0047] Preparation of test sample...

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Abstract

The invention provides toughened polylactic acid and a preparation method thereof. The toughened polylactic acid is prepared by carrying out melt blending on a polyester elastomer and polylactic acid at the temperature of 180-220 DEG C, wherein the adopted polyester elastomer is synthesized by taking biomass binary acid and dihydric alcohol like lactic acid as raw materials; a lactic acid chain segment contained in the elastomer has good compatibility with polylactic acid and can be crushed and dispersed in polylactic acid matrix in a blending process, so that the toughening effect is realized; meanwhile, due to double bonds in the elastomer, a crosslinking agent is added, crosslinking reaction is carried out on the elastomer in a melt blending process, polylactic acid can be grafted onto the elastomer after crosslinking, and compatibility of a system is further improved; compared with the common plasticizer like polyethylene glycol, the polyester elastomer can not migrate from the matrix due to high molecular weight, so that the polyester elastomer can be used for effectively toughening polylactic acid and also can be used for maintaining a long-acting stable toughening effect; and elongation at break of the toughened polylactic acid is increased to 100-350%, and impact strength is increased to 6.1-35.3KJ / M<2>.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a toughened polylactic acid and a preparation method thereof. Background technique [0002] Plastic products play an irreplaceable role in people's lives. Traditional plastics are mainly synthesized from petrochemical resources. With the continuous consumption of non-renewable resources such as petroleum, the development of the plastics industry is facing huge challenges. At the same time, the global white pollution caused by a large amount of discarded petroleum-based plastics is increasing. In order to reduce the dependence on non-renewable resources such as petroleum and realize the sustainable development of the polymer material industry, finding environmentally friendly new materials has become a hot research issue. Based on this situation, bio-based polymer materials have attracted more and more attention. [0003] Polylactic acid (PLA) is a new type of biodegrad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/06C08G63/60B29B7/28
Inventor 张立群胡潇然康海澜李炎李满强王润国徐日炜
Owner BEIJING UNIV OF CHEM TECH
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