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Method for preparing plasticizer of copolymer with multiple blocks of poly lactic acid / poly alkylidene radical ether

A technology of multi-block copolymer and polyalkylene ether, which is applied in the field of preparation of polylactic acid/polyalkylene ether multi-block copolymer plasticizer, can solve the problems of high cost and low yield, and achieves The effect of improving yield, simplifying refining process and facilitating industrial production

Inactive Publication Date: 2007-10-10
SHANGHAI TONG JIE LIANG BIOMATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the block copolymer of polylactic acid and polyalkylene ether in this technology is synthesized by lactide and polyalkylene ether, and the purity of lactide used for polymerization is relatively high, which requires distillation, recrystallization, etc. Refined, so the synthesis yield is lower and the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 800g of L-lactic acid and 0.5mol succinic acid into the vacuum reactor, add 0.5g of stannous chloride catalyst, vacuumize, control the pressure of the reactor at 1.0kPa, raise the temperature of the reactor to 100°C, and react 5 hours; then the temperature of the reactor was raised to 165° C., the pressure dropped to below 300 Pa, and the reaction was continued for 7 hours to obtain a carboxyl-terminated lactic acid prepolymer;

[0024] (2) Add the prepolymer obtained by the reaction in step (1) and polyethylene glycol 4000 in a molar ratio of 1:1 to the reactor, vacuumize and fill with nitrogen, and after repeated operations several times, the system pressure is reduced to below 300Pa , and then reacted at 170° C. for 10 hours, and discharged under nitrogen protection to obtain the desired product A1.

[0025] Use a twin-screw extruder to mix A1 with a weight-average molecular weight of 1.5×10 at a ratio of 20:80. 5 The properties obtained by blending polylact...

Embodiment 2-3

[0029] Change succinic acid into malonic acid and adipic acid respectively, and the rest of the conditions are the same as in Example 1. The products A2 and A3 are prepared according to the method of Example 1, and blended according to the method of Example 1. The test performance is as shown in Table 1 .

Embodiment 4-6

[0031] Change Polyethylene Glycol 4000 into Polyethylene Glycol 10000, Polypropylene Glycol 4000, Polyethylene Glycol and Polypropylene Glycol Copolymer 4000, other conditions are the same as Example 1, prepare required product A4-A6, all the other conditions are the same as Example 1 , blended according to the method of Example 1, and the test performance is shown in Table 1.

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PUM

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Abstract

This invention discloses a method for preparing poly (lactic acid)-based plasticizer. The method comprises: (1) melt-polycondensing lactic acid and small molecular dicarboxylic acid at a mol. ratio of 1:(10-100) in the presence of catalyst at 100-120 deg.C and 1-2 kPa for 3-5 h, and then at 140-180 deg.C and below 300 Pa for 3-15 h to obtain carboxyl-terminated prepolymer; (2) melt-polycondensing the prepolymer and polyalkylidene ether diol at a mol. ratio of (1:3)-(3:1) in nitrogen atmosphere at 150-230 deg.C and below 300 Pa for 3-20 h to obtain lactic acid-alkylidene ether multi-block copolymer. The method has such advantages as simple process, and abundant raw materials, and is suitable for industrialization.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a polylactic acid / polyalkylene ether multi-block copolymer plasticizer. Background technique [0002] Polylactic acid (PLA) is a polymer with excellent biocompatibility and biodegradability. It is derived from renewable resource crops (such as corn). The most prominent advantage is biodegradability. After use, it can It is completely degraded by microorganisms in nature, and finally produces carbon dioxide and water, which does not pollute the environment and is very beneficial to the protection of the environment. Polylactic acid has good mechanical properties and physical properties, and is suitable for various processing methods such as blow molding and thermoplastic, and is easy to process. While polylactic acid has many excellent properties, it also has some shortcomings that cannot well meet the needs of packaging products. Its...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G63/06C08G65/34C08G63/85C08L67/04
Inventor 张乃文王秦峰王亮任杰
Owner SHANGHAI TONG JIE LIANG BIOMATERIALS
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