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Ring opening polymerization method for lactide and caprolactam copolymer

A caprolactam and ring-opening polymerization technology is applied in the field of ring-opening polymerization of lactide and caprolactam copolymers, which can solve the problems of white pollution, pollute groundwater and soil, block soil water circulation, etc., and achieve high moisture regain and good air permeability. Effect

Inactive Publication Date: 2018-04-24
YANCHENG TIANSHUN MACHINERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

What's more serious is that more than 50% of plastic products are discarded after use, and these wastes can exist in the natural environment for hundreds of years, not only causing "white pollution", but also continuously polluting groundwater and soil, hindering movement. Plant growth that endangers human health and survival
The traditional method of waste disposal is recycling and centralized incineration, burial or recycling, but the first two methods will generate new pollution, block soil water circulation, and increase harmful gas emissions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 10 kg of L-lactide and 1 kg of caprolactam were dried in a drying oven at 50°C and 50 Pa for 3 hours under vacuum conditions, and the dried L-lactide and caprolactam were added to a 50L reaction kettle; The compound of dibutyltin and zinc lactate in the system is 11 grams, wherein the molar ratio of dibutyltin and zinc lactate is 0.5; vacuumize and nitrogen-fill repeatedly 5 times, and finally keep the pressure of the reaction system at 0.15MPa; the reaction kettle is heated to 135°C and opened Stirring, the stirring rate is 60 rpm, and the stirring is stopped in 0.5 hours, and 10.95 kg of copolymers are obtained after 8 hours of reaction.

[0028] GPC analysis shows that the number average molecular weight of the copolymer is 55,000, and the molecular weight distribution is 1.2; the product yield is 99.5%.

Embodiment 2

[0030] 9.7kg of L-lactide, 0.3kg of D-lactide and 0.5kg of caprolactam were dried in a drying oven at 50°C and 50Pa under vacuum conditions for 3 hours, and the dried L-lactide and caprolactam were added to 50L Add 40 grams of the compound of dibutyltin and zinc lactate in the catalytic system at the same time, wherein the molar ratio of dibutyltin and zinc lactate is 0.8; vacuumize and fill nitrogen repeatedly 5 times, and finally keep the pressure of the reaction system at 0.25MPa; The temperature of the kettle was raised to 135° C., and the stirring was started at a rate of 60 rpm, and the stirring was stopped after 0.5 hour. After 8 hours of reaction, 10.96 kg of copolymer was obtained.

[0031] GPC analysis showed that the number average molecular weight of the copolymer was 77,000, and the molecular weight distribution was 1.3; the product yield was 99.6%.

Embodiment 3

[0033] 9.7kg of L-lactide, 0.3kg of D-lactide and 1kg of caprolactam were dried in a drying oven at 50°C and 50Pa under vacuum conditions for 3 hours, and the dried L-lactide and caprolactam were added to 50L In the reaction kettle; add 6 grams of the complex of catalytic system dibutyltin and zinc lactate simultaneously, and wherein the molar ratio of dibutyltin and zinc lactate is 1.7; Vacuumize nitrogen and fill repeatedly 5 times, keep reaction system pressure at last and be 0.3MPa; Reaction The temperature of the kettle was raised to 170° C., and the stirring was started at a rate of 60 rpm. The stirring was stopped after 0.5 hour, and 10.9 kg of copolymer was obtained after 8 hours of reaction.

[0034] GPC analysis showed that the number average molecular weight of the copolymer was 85,000, and the molecular weight distribution was 1.1; the product yield was 99.1%.

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PUM

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Abstract

The invention provides a method for ring-opening polymerization of a lactide and caprolactam copolymer, comprising: the raw materials of lactide and caprolactam obtained by drying under certain conditions are added to the reactor according to the weight ratio of 10-20, and the catalyst system Under the action, the pressure of the ring-opening reaction is 0.15-0.30MPa, the reaction temperature is 110-170°C, and the copolymer is prepared after 6-10 hours of reaction. The copolymer prepared by the method of the invention is biodegradable, can replace traditional petroleum-based plastics, and the obtained copolymer has good moisture regain and good air permeability.

Description

technical field [0001] The invention belongs to the technical field of new material synthesis, and in particular relates to a ring-opening polymerization method of a lactide and caprolactam copolymer. Background technique [0002] The widespread use of traditional plastics consumes a large amount of precious non-renewable petroleum resources, which has exacerbated the energy crisis in today's increasingly scarce petroleum resources. What's more serious is that more than 50% of plastic products are discarded after use, and these wastes can exist in the natural environment for hundreds of years, not only causing "white pollution", but also continuously polluting groundwater and soil, hindering movement. Plant growth that endangers human health and survival. The traditional methods of waste disposal are recovery and centralized incineration, burial or recycling, but the first two methods will generate new pollution, block the soil water cycle, and increase harmful gas emission...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/08
CPCC08G63/6852C08G63/08
Inventor 王金燃
Owner YANCHENG TIANSHUN MACHINERY TECH CO LTD