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Method for preparing epoxy resin curing agent by degrading polyethylene terephthalate with glycerine

A technology of epoxy resin curing and glycerol, applied in epoxy resin coatings, recycling technology, organic chemistry and other directions, can solve the problems of low water absorption and low utilization value, and achieve the effect of low temperature curing water absorption

Inactive Publication Date: 2011-07-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if epoxy resin does not have a suitable curing agent, its own use value is very small. If a new curing agent can be developed, it can have functions such as curing, toughening, flame retardancy, and acceleration, and has fast curing, low-temperature curing and The characteristics of low water absorption, etc., will make a significant contribution in the field of epoxy resin curing agent

Method used

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  • Method for preparing epoxy resin curing agent by degrading polyethylene terephthalate with glycerine
  • Method for preparing epoxy resin curing agent by degrading polyethylene terephthalate with glycerine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Install the reaction device: take a four-necked flask as a reaction vessel, three of which are respectively equipped with a thermometer, a reflux condensing device and a nitrogen device; the four-necked flask is fixed on an electric stirring device;

[0019] (2) Degradation reaction: add 500 parts of glycerol, 0.1 part of catalyst zinc acetate ZnAc in the four-necked flask 2 , slowly raise the temperature until the catalyst is completely melted, and then pass nitrogen; add 100 parts of polyethylene terephthalate PET, continue to heat up to 290 ° C, turn on the electric stirring device after the PET is completely dissolved, control the speed at 150r / min, and react for 2.5h , to obtain a brown-yellow viscous product and a light yellow transparent fraction; the unit is parts by weight, the same below;

[0020] (3) Distillation under reduced pressure: Cool the brown-yellow viscous product obtained in step (2) to 145°C, and pour it into a reduced-pressure distillation de...

Embodiment 2

[0023] (1) Install the reaction device: take a four-necked flask as a reaction vessel, three of which are respectively equipped with a thermometer, a reflux condensing device and a nitrogen device; the four-necked flask is fixed on an electric stirring device;

[0024] (2) Degradation reaction: add 600 parts of glycerol, 0.2 parts of catalyst zinc acetate ZnAc in the four-necked flask 2 , slowly raise the temperature until the catalyst is completely melted, and then pass nitrogen; add 150 parts of polyethylene terephthalate PET, continue to heat up to 290 ° C, turn on the electric stirring device after the PET is completely dissolved, control the speed at 200r / min, and react for 3 hours. A brownish-yellow viscous product and a light yellow transparent fraction were obtained;

[0025] (3) Distillation under reduced pressure: Cool the brown-yellow viscous product obtained in step (2) to 140°C and pour it into a reduced-pressure distillation device; control the reduced-pressure d...

Embodiment 3

[0028] (1) Install the reaction device: take a four-necked flask as a reaction vessel, three of which are respectively equipped with a thermometer, a reflux condensing device and a nitrogen device; the four-necked flask is fixed on an electric stirring device;

[0029] (2) Degradation reaction: add 700 parts of glycerol, 0.3 parts of catalyst zinc acetate ZnAc in the four-necked flask 2 , slowly raise the temperature until the catalyst is completely melted, and then pass nitrogen gas; add 200 parts of polyethylene terephthalate PET, continue to heat up to 290 ° C, turn on the electric stirring device after the PET is completely dissolved, control the speed at 200r / min, and react for 3 hours. A brownish-yellow viscous product and a light yellow transparent fraction were obtained;

[0030] (3) Distillation under reduced pressure: Cool the brown-yellow viscous product obtained in step (2) to 145°C, and pour it into a reduced-pressure distillation device; control the reduced-press...

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Abstract

A method for preparing epoxy resin curing agent by degrading polyethylene terephthalate (PET) with glycerine relates to the technical field of the preparation of the epoxy resin curing agent. The method comprises the following steps: adding glycerine and ZnAc2 used as catalyst in a four-necked flask in turn according to a certain ratio, fixing the four-necked flask on an electric mixer, slowly heating to ensure that catalyst is completely dissolved, introducing nitrogen, then adding polyethylene terephthalate continuously heating to ensure that PET is completely dissolved, starting the mixer to react; cooling the reaction product, transferring the reaction product to a reduced pressure distillation device to obtain an intermediate product after the reduced pressure distillation; and adding the intermediate product and sodium methylate used as catalyst in the four-necked flask, continuously dropping diethanol amine in the reaction system with a constant pressure funnel, and controllingthe reaction temperature to react and obtain the epoxy resin curing agent. By adopting the invention, the epoxy resin curing agent which has the functions such as curing, toughening, antiflaming and promoting and is characterized by fast curing, low-temperature curing, low water absorption and the like, can be prepared.

Description

technical field [0001] The invention relates to the field of epoxy resin manufacture, and relates to a method for preparing an epoxy resin curing agent by degrading PET with glycerol. Background technique [0002] Polyester PET has excellent physical and chemical properties, and has been widely used in synthetic fibers, plastic packaging bottles, films, composite materials, new materials prepared by copolymerization and biomedicine. However, because polyester is difficult to be biodegraded under natural conditions, a large amount of waste polyester has brought heavy pressure to the environment. Therefore, the degradation of waste polyester is still the focus of research at home and abroad. Epoxy resins are widely used and can be used as adhesives, coatings, etc. in fields such as construction, aviation and navigation, automobiles, and electronics. However, if the epoxy resin does not have a suitable curing agent, its own use value is very small. If a new curing agent can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C217/50C08J11/24C08G59/50C09D163/00
CPCY02W30/62
Inventor 葛明桥余天石张旋
Owner JIANGNAN UNIV
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