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Polylactic acid composition containing sulfoacid compound and phosphorus-containing organic compound and preparation method thereof

A technology of sulfonic acid compound and organic compound, applied in the field of polylactic acid composition and preparation thereof, can solve the problems of poor heat resistance and hydrolysis resistance of polylactic acid, and high production cost of polylactic acid, and achieve the effect of good hydrolysis resistance

Active Publication Date: 2010-12-22
萘琪沃克有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The object of the present invention is to solve the problem of poor heat resistance and hydrolysis resistance of polylactic acid, and provide a polylactic acid containing sulfonic acid and phosphorus-containing organic compounds, which has the advantages of high thermal stability, high hydrolysis resistance and excellent color. Lactic acid composition
[0016] Another object of the present invention is to provide a method for synthesizing polylactic acid using dibasic sulfonic acid or polybasic sulfonic acid as a catalyst or co-catalyst in view of the high production cost of polylactic acid at the present stage

Method used

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  • Polylactic acid composition containing sulfoacid compound and phosphorus-containing organic compound and preparation method thereof
  • Polylactic acid composition containing sulfoacid compound and phosphorus-containing organic compound and preparation method thereof
  • Polylactic acid composition containing sulfoacid compound and phosphorus-containing organic compound and preparation method thereof

Examples

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Effect test

Embodiment 1

[0123] After pouring 200 g of 90 wt % L-lactic acid aqueous solution into a 500 mL four-necked flask, the flask was placed in an oil bath. Install a stirrer on the four-neck flask, insert a thermocouple thermometer, connect the vacuum pipeline and the nitrogen pipeline and replace with nitrogen for 3 times, then raise the temperature of the oil bath to 120°C for dehydration. The system pressure gradually decreased from normal pressure to 5KPa within 60 minutes from the start of dehydration; then continued dehydration at 5KPa for 1.5 hours (total dehydration 2.5 hours); at this time, after returning the system pressure to normal pressure with nitrogen, add 1,3-propanedisulfonic acid 8.61mg (the addition amount is 15ppm relative to the monomer mass in terms of sulfur element, that is, C s0 =15ppm, the same below). Then the temperature of the system was raised to 150°C, the pressure was gradually reduced from normal pressure to 0.2KPa within 2 hours and the pressure was kept at ...

Embodiment 2

[0133] After pouring 200 g of 90 wt % L-lactic acid aqueous solution into a 500 mL four-necked flask, the flask was placed in an oil bath. Install a stirrer on the four-neck flask, insert a thermocouple thermometer, connect the vacuum pipeline and the nitrogen pipeline and replace with nitrogen for 3 times, then raise the temperature of the oil bath to 120°C for dehydration. The system pressure gradually decreased from normal pressure to 5KPa within 60 minutes from the start of dehydration; then continued dehydration at 5KPa for 1.5 hours (total dehydration 2.5 hours); at this time, after returning the system pressure to normal pressure with nitrogen, add 1,20-eicosanedisulfonic acid 7719.8mg (6210ppm). Then the temperature of the system was raised to 160°C, the pressure was gradually reduced from normal pressure to 0.3KPa within 2 hours, and the pressure was kept at 0.3KPa for 4 hours (6 hours in total) after melt polymerization, poured out, and cooled to obtain polylactic ac...

Embodiment 3

[0143] After pouring 200 g of 90 wt % L-lactic acid aqueous solution into a 500 mL four-necked flask, the flask was placed in an oil bath. Install a stirrer on the four-neck flask, insert a thermocouple thermometer, connect the vacuum pipeline and the nitrogen pipeline and replace with nitrogen for 3 times, then raise the temperature of the oil bath to 120°C for dehydration. The system pressure gradually decreased from normal pressure to 5KPa within 60 minutes from the start of dehydration; then continued dehydration at 5KPa for 1.5 hours (total dehydration 2.5 hours); at this time, after returning the system pressure to normal pressure with nitrogen, add 1,3-propanedisulfonic acid 240.75mg (C s0= 420ppm). Then the temperature of the system was raised to 160°C, the pressure was gradually reduced from normal pressure to 0.3KPa within 2 hours and the pressure was kept at 0.3KPa after melt polymerization for 4 hours (6 hours in total) and then cooled to obtain a polylactic acid ...

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Abstract

The invention discloses a polylactic acid composition containing a sulfoacid compound and a phosphorus-containing organic compound. The polylactic acid composition contains polylactic acid, a nitrogen-containing organic compound and the sulfoacid compound. The invention also discloses a preparation method of the polylactic acid composition containing the sulfoacid compound and a nitrogen-containing organic compound, comprising the following steps of: carrying out melt polycondensation by using bibasic sulfoacid and / or polybasic sulfoacid as a catalyst to obtain a polylactic acid product; and further carrying out solid-phase polymerization to the melt-polycondensation product to obtain high-molecular weight polylactic acid, wherein the nitrogen-containing organic compound can be added to alactic acid monomer at the beginning of the melt polycondensation or added to the polylactic acid after the melt polycondensation is completed. The polylactic acid composition obtained in the method has higher hydrolysis resistance, higher heat stability and excellent color and luster, and when the polylactic acid composition is processed for 5 days at the condition of the relative humidity of 90% and the temperature of 60 DEG C, the weight-average molecular weight of the polylactic acid is reduced by 50% at most.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polylactic acid composition and a preparation method thereof. Background technique [0002] In the 21st century, environmental pollution and resource shortages have become global problems, and they are getting more and more attention. Synthetic polymer materials using petroleum as raw materials are widely used and have made important contributions to the development of human civilization. However, such materials are difficult to recycle after use, causing serious "white pollution" problems; on the other hand, petroleum is a non-renewable resource, and the increasing consumption of petroleum has caused human beings to face serious resource shortages. It is expected that the development and application of degradable plastics (mainly aliphatic polyesters), especially degradable materials derived from renewable resources, can greatly alleviate these two problems in the...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K5/42C08K5/49C08G63/06C08G63/87C08G63/80
Inventor 于波何勇宋婷婷左璞晶
Owner 萘琪沃克有限责任公司
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