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Aliphatic series-polylactic acid segmented copolymer and preparation method thereof

A technology of block copolymer and polylactic acid, applied in the field of aliphatic-polylactic acid block copolymer and its preparation, can solve the problems of high melting point temperature, increased energy consumption, etc. effect of value

Active Publication Date: 2014-05-21
普立思生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the melting point temperature of this type of polylactic acid during processing is 175 ° C ~ 230 ° C, the melting point temperature is relatively high, which increases the energy consumption in the processing process

Method used

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  • Aliphatic series-polylactic acid segmented copolymer and preparation method thereof
  • Aliphatic series-polylactic acid segmented copolymer and preparation method thereof
  • Aliphatic series-polylactic acid segmented copolymer and preparation method thereof

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preparation example Construction

[0047] The invention provides a kind of preparation method of aliphatic-polylactic acid block copolymer, comprises the following steps:

[0048] a) Under an oxygen-free environment, a saturated diol compound and lactide are polymerized to obtain a double-hydroxyl-terminated polylactic acid oligomer;

[0049] b) carry out esterification reaction and polycondensation reaction with the polylactic acid oligomer that saturated dihydric alcohol compound, saturated dicarboxylic acid compound and described step a) obtain, obtain the polylactic acid oligomer having formula (I) Structured aliphatic-polylactic acid block copolymer;

[0050] The saturated dicarboxylic acid compound includes one or more of saturated dicarboxylic acid and saturated dicarboxylic acid compound;

[0051]

[0052] Among them, p=1~50, q=5~500, n=6~50;

[0053]R and Y are independently selected from alkylene or ether;

[0054] M is selected from alkylene.

[0055] The method for preparing aliphatic-polylac...

Embodiment 1

[0090] The 2L reaction kettle with four vents was repeatedly evacuated and nitrogen-filled to cool, and then under the condition of feeding nitrogen, 1000g (7mol) of lactide, 18.6g (0.3mol) of ethylene glycol and 1g of stannous octoate were added. Seal the system, put it in an oil bath preheated to 120°C, and carry out the polymerization reaction under magnetic stirring for 14 hours to obtain a white crystalline polymer. The pressure is 200 Pa, and the polylactic acid oligomer terminated by double hydroxyl groups is obtained.

[0091] The test results show that the relative number average molecular weight of the obtained bishydroxyl-terminated polylactic acid oligomer is 3.0 kg / mol, and the melting point is 135° C.

[0092] The 2L reaction kettle with four vents was repeatedly evacuated and nitrogen-filled to cool, and then, under the condition of nitrogen gas, 470g of succinic acid, 400g of butanediol, 0.5g of tetrabutyl titanate and the above-mentioned dihydroxy After addin...

Embodiment 2

[0099] The 2L reaction kettle with four vents was repeatedly evacuated and nitrogen cooled, and then under the condition of feeding nitrogen, 470g of succinic acid, 400g of butanediol, 0.5g of aluminum isopropoxide and the dihydroxy After adding 300 g of end-capped polylactic acid oligomers into the reactor in sequence, the reactor was heated up to 150° C., and the reactants were stirred, and the water generated by the reaction was collected at the same time. When no liquid was distilled out during the reaction, the The reaction temperature is set at 215°C, and the temperature of the system is gradually increased. When it reaches 215°C, it is gradually reduced to a high vacuum state, and the pressure is 200Pa. The polycondensation reaction is carried out, and the material is discharged for 3 hours to obtain a butylene succinate-polylactic acid block copolymer.

[0100] The present invention tests the product obtained in this embodiment according to the gel permeation chromatog...

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Abstract

The invention provides an aliphatic series-polylactic acid segmented copolymer which has a structure indicated by the formula (I). Under the situation that the relative number average molecular weight of the aliphatic series-polylactic acid segmented copolymer is close to that of the polylactic acid in the prior art, the melting point is greatly reduced, the energy consumption in the processing flow is reduced, and the cost is further reduced. The experimental result shows that the melting point of the aliphatic series-polylactic acid segmented copolymer is 125-137 DEG C. The preparation method comprises the following steps: polymerizing saturated dihydric alcohol compound and lactide in an oxygen-free environment; esterifying and concentrating the obtained polylactic acid low polymer sealed by dihydroxy with saturated dihydric alcohol compound and saturated dicarboxylic acid compound to obtain the aliphatic series-polylactic acid segmented copolymer with the structure indicated in the formula (I). In the preparation process, no organic solvent is used, no toxic chain expanding agent is used, the cost is saved, and the environmental pollution is also reduced. The formula (I) is shown in the specification.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to an aliphatic-polylactic acid block copolymer and a preparation method thereof. Background technique [0002] Plastic products are indispensable in people's lives, but traditional plastic products generally take hundreds of years or even longer to degrade completely, resulting in serious "white pollution"; at the same time, traditional plastic raw materials are derived from petroleum and other unavailable Renewable resources, with the depletion of petrochemical resources, the traditional plastic industry is also threatened. Therefore, vigorously developing environmentally friendly biodegradable polymer materials to replace petroleum-based plastic products has become a hot spot in current research and development. [0003] Polylactic acid is a biodegradable green polymer material based on biomass resources. It is non-toxic, non-irritating, and has good bioabs...

Claims

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Application Information

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IPC IPC(8): C08G63/16C08G63/08C08G63/672C08G63/78
Inventor 张宝边新超孙敬茹李杲陈学思
Owner 普立思生物科技有限公司
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