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Lactic acid-based resin composition

一种树脂组合物、乳酸基的技术，应用在合成树脂层状产品、化学仪器和方法、分层产品等方向，能够解决再现性不好、反应难以控制、不可能得到聚乳酸层压材料等问题

Inactive Publication Date: 2005-07-20
MITSUI CHEM INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] (1) The polymer is over-crosslinked to obtain a colloid, and the film formed by it has many white spots, so it has no commercial value;
[0017] (2) This reaction is difficult to control, and the reproducibility of this method of obtaining the expected cross-linked product is not good;
[0018] (3) Hydrogen peroxide requires additional equipment to handle it safely
[0021] (1) It is impossible to obtain uniform moldings,
[0022] (2) The heat seal strength of this film is greatly reduced by delamination, and
[0023] (3) Through lamellar peeling, the impact strength of this molding is greatly reduced
[0024] As mentioned above, in the current state of the art, it is practically impossible to obtain laminates of polylactic acid by conventional extrusion lamination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0072] A preferred embodiment of the lactic acid-based resin is polylactic acid resin.

[0073] A preferred embodiment of the polylactic acid resin is the polylactic acid resin of Mitsui Chemicals Co., Ltd., LACEA (trade name).

[0074] LACEA brands include, for example, H-100, H-400, H-440, H-360, H-280, 100J, H-100E, M151S Q04, M151S Q52, etc.

[0075] [Ethylene-unsaturated carboxylic acid copolymer and its ionically crosslinked copolymer]:

[0076] The unsaturated carboxylic acid unit content of the ethylene-unsaturated carboxylic acid copolymer or its ion-crosslinked copolymer used in the present invention preferably falls between 2 and 25% by weight, more preferably between 5 and 20% by weight. If its carboxylic acid unit content is less than the above-defined range, the copolymer or its ionically crosslinked copolymer will be incompatible with polylactic acid; but if it is greater than this range, the copolymer or its ionically crosslinked copolymer will be extremely difficu...

preparation Embodiment 1

[0120] 400 kg of L-lactide, 0.04 kg of stannous zincate, and 0.12 kg of dodecanol were put into a thick-walled column type stainless steel polymerization reactor equipped with a stirrer, and vacuum degassed for 2 hours. Purged with nitrogen, the resulting mixture was heated and stirred at 200°C under 10 mmHg for 2 hours.

[0121] After the reaction, the polylactic acid melt was taken out from the outlet at the bottom, cooled in the air, and cut with a pelletizer. In this way, 340 kg of polylactic acid (yield 85%) was obtained, and the weight average molecular weight (Mw) of this polymer was 138,000.

preparation Embodiment 2

[0123] 100kg of 90% L-lactic acid and 450g of tin powder were put into a reactor equipped with a Dien-Stark soda valve, heated and stirred at 150°C under 50mmHg for 3 hours while evaporating the water, and then further stirred at 30mmHg, 150°C For 2 hours, the oligomerization reaction was carried out. To the oligomer, 210kg of diphenyl ether, 35mmHg, and 150°C were added for azeotropic dehydration. The evaporated water and solvent are separated in the Dien-Stark soda valve, and only the solvent is returned to the reactor. The organic solvent returned to the reactor after 2 hours passes through a column containing 46 kg of 3A molecular sieve and then returns to the reactor. Under these conditions, the reaction was continued at 17 mmHg and 130°C for 20 hours to obtain a polylactic acid solution with a weight average molecular weight (Mw) of 150,000. This solution was diluted by adding 440 kg of anhydrous diphenyl ether, then cooled to 40°C, and the precipitated crystals were taken o...

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Abstract

Provided is a lactic acid-based resin composition that comprises a lactic acid-based (component (A)), and an ethylene-unsaturated carboxylic acid copolymer (component (B)) and / or an ethylene-unsaturated carboxylic acid copolymer ionomer (component (C)). The lactic acid-based resin composition has good physical properties in melt and can be efficiently formed into films and laminates through casting or extrusion lamination. The paper laminates obtained through extrusion with the resin composition have good moisture barrier property, and have the advantages of good antibacterial ability, good biodegradability and low combustion heat. And the moldings obtained from the resin composition of the invention have a characteristic which is excellent in impact strengh.

Description

Technical field [0001] The present invention relates to a lactic acid-based resin composition and molded products thereof, and a method for preparing them. More precisely, the present invention relates to a lactic acid-based resin composition with high safety and complete biodegradation after use, to a paper layer sheet containing the resin composition, and a method for preparing them. Background technique [0002] Generally, polyethylene resin, polypropylene resin, ethylene terephthalate resin, and other resins are used for paper sheet. However, when treated after use, they will increase the amount of their waste. In addition, because they hardly degrade in the natural environment, they will remain on the surface temporarily after the land improvement treatment. In addition, because some resin garbage destroys the scenery and even the living environment of marine life, it is more difficult to solve. [0003] To solve these problems, polyhydroxy carboxylic acids such as polylacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/10B32B27/36B32B29/00C08J5/18C08L23/08C08L67/04
CPCC08L23/0876C08J2367/04B32B29/00B32B27/10C08L67/04B32B27/36C08L23/0869C08J5/18C08L2666/26C08L2666/06C08L23/06B32B2307/7145B32B2307/7163B32B37/153
Inventor 大渊省二牧伸行舘野均
Owner MITSUI CHEM INC
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