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Toughened polylactic acid and preparation method of same

A polylactic acid and toughening technology, applied in the field of toughening polylactic acid and its preparation, can solve the problems of PLA material not having stability, low elongation at break, widely used, loss of plasticizing effect, etc., to overcome the migration and precipitation behavior. , high toughness, the effect of improving toughness

Active Publication Date: 2015-05-20
江苏美韦纶新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] PLA is similar to general-purpose plastics such as polyethylene, polypropylene, and polystyrene in many properties, but PLA itself has strong brittleness, poor impact resistance, and low elongation at break, which limits its wide application in the field of general-purpose plastics.
Usually, the toughness of the material can be improved by adding plasticizers such as dioctyl phthalate, tributyl citrate, glycerin, glyceryl acetate and polyethylene glycol, but these plasticizers will gradually migrate to the surface during use. Migration and loss of plasticizing effect, so that the plasticized PLA material does not have long-term stability

Method used

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preparation example Construction

[0025] The preparation method of the polyethylene glycol-dibasic acid-lactide specifically can be prepared according to the following method:

[0026] The dibasic acid or its anhydride, polyethylene glycol and lactide are reacted under the action of a catalyst to obtain a ternary copolymer of polyethylene glycol-dibasic acid-lactide.

[0027] As a preferred version, the preparation method of the terpolymer of polyethylene glycol-diacid-lactide is specifically:

[0028] Mix dibasic acid or its anhydride with polyethylene glycol, heat up to 70-100°C to dissolve and stir evenly, then add lactide, and finally add catalyst, after reaction, dehydrate under high vacuum at 130-170°C to obtain polyethylene glycol - Terpolymers of dibasic acid-lactide.

[0029] The preparation method of the polyethylene glycol-dibasic acid-lactic acid can be prepared according to the following method:

[0030] The dibasic acid or its anhydride, polyethylene glycol and lactic acid are reacted under the...

Embodiment 1

[0040] Drying treatment of polyethylene glycol After strict drying treatment, the ground three-neck bottle equipped with a magnetic stirrer and a thermometer was weighed. Add about 250g of polyethylene glycol 400 (PEG-400) into the three-neck bottle and seal it, leaving only the vacuum interface, stir and heat with a heating mantle with an electromagnetic stirrer, slowly raise the temperature to 130°C, dehydrate under high vacuum, and the solution Dehydration for 2 hours after bubbles are no longer generated in the medium, and then cooled to below 90 ° C, the vacuum is released under the protection of nitrogen, weighed, and the mass of PEG-400 is accurately calculated.

[0041] Synthesis of polyether polyester Add succinic anhydride (SA) with equimolar mass to PEG-400 in a three-neck flask and stir for 10 minutes, then add SnCl with a molar mass of SA of 0.3% 2 , control the reaction temperature at 90°C, react for 16 hours, slowly raise the temperature to 150°C, and dehydrate ...

Embodiment 2

[0045] The drying treatment of Polyethylene Glycol is with embodiment 1.

[0046] Synthesis of polyether polyester Add succinic anhydride (SA) with equimolar mass to PEG-400 in a three-neck flask and stir for 10 minutes, then add SnCl with a molar mass of SA of 0.3% 2 , control the reaction temperature at 90°C, react for 16 hours, slowly raise the temperature to 150°C, and dehydrate under high vacuum for 24 hours. The weight average molecular weight of the obtained polyether polyester is 23kg / mol, and the molecular weight distribution index is 1.9. Store it in a sealed glass reagent for later use , labeled PES2.

[0047] Blend ratio PLA, PES2 and ADR-4370-S were melt blended at mass ratios of 90:10:0.4, 80:20:0.4 and 70:30:0.4; the preparation of the blend was the same as in Example 1.

[0048] The elongation at break of the blends of PLA and PES2 is shown in Table 1. Table 1 contains the data of the elongation at break of the blends of PLA and PES2, and also includes the elo...

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Abstract

The invention provides a toughened polylactic acid and a preparation method of the same. The toughened polylactic acid is prepared according to the following method: blending polyether polyester with polylactic acid at 180-220 DEG C in molten state to obtain the toughened polylactic acid. According to the toughened polylactic acid provided by the invention, the polylactic acid is treated by toughening modification through a method of being blended with the polyether polyester in molten state, the polyether polyester is synthesized with the raw material of polyethylene glycol, since the polyether polyester has a polyether chain segment, the polyether chain segment can improve the toughness of the polylactic acid, meanwhile, relative to the polyethylene glycol, the polyether polyester has higher molecular weight, the migration and precipitation behavior from the polylactic acid matrix is overcome effectively, thus, the polyether polyester not only can keep the efficient toughening effect on the polylactic acid, but also enables the toughened effect of the polylactic acid to be persistently steady. The experimental result shows that the elongation at break of the toughened polylactic acid provided by the invention is increased to 10%-400%.

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 are indispensable in people's lives, but a large amount of waste petroleum-based plastics such as polyolefin, polystyrene and polyvinyl chloride have led to increasing global white pollution; at the same time, fossil resources are also being depleted, which will seriously restrict plastics. With the development of industry, searching for environmentally friendly and sustainable new materials has become a hot research issue. On the other hand, the application of fossil resources and products has changed the basic composition of the atmosphere and emitted a large amount of carbon dioxide and other greenhouse gases, leading to global warming and serious natural disasters. Therefore, biodegradable plastics have become an important material for promoting a low-carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/00C08G63/672C08G63/66C08K5/524C08K5/15
Inventor 冯立栋边新超刘焱龙项盛孙彬陈学思李杲
Owner 江苏美韦纶新材料科技有限公司
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