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Method for preparing alkyd resin coating by glycerol alcoholysis of waste PET

A technology of alkyd resin and glycerol, used in polyester coatings, coatings, etc., can solve problems such as environmental pollution, use restrictions, transparency and hygiene problems

Inactive Publication Date: 2013-12-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If proper methods are not adopted, it will cause serious environmental pollution on the one hand, and waste of non-renewable resources on the other hand.
At present, the most important way to deal with waste PET plastics is to directly recycle them, but because the recycled materials contain impurities, etc., the physical properties will be reduced, and there are problems with transparency and sanitation, so the use is limited

Method used

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  • Method for preparing alkyd resin coating by glycerol alcoholysis of waste PET
  • Method for preparing alkyd resin coating by glycerol alcoholysis of waste PET
  • Method for preparing alkyd resin coating by glycerol alcoholysis of waste PET

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Wash the waste PET with deionized water, put it in an oven at 30-60°C and dry it for 18-30 hours. Put the dried waste PET into a pulverizer to pulverize and pass through a 200-mesh sieve to obtain powder waste PET. Take 50g powder waste PET and 50g glycerol in a three-necked flask, add 0.5gZn(AC) 2 , under the condition of reflux condensation, the temperature was raised to about 240°C, and the PET solid began to dissolve. After the PET solid is dissolved, the temperature of the system will drop to about 230°C under the condition of reflux condensation. As the reaction progresses, the PET molecules depolymerize continuously, and the reflux condensation temperature of the system decreases continuously. After about 10 hours of reaction, the reflux condensation temperature is about 170°C, and the alcoholysis reaction is completed. When the temperature of the system drops to 120°C, take 34g of alcoholysis product and 50g of linseed oil in a three-necked flask, add 0.1g of...

Embodiment 2

[0026] Wash the waste PET with deionized water, put it in an oven at 30-60°C and dry it for 18-30 hours. Put the dried waste PET into a pulverizer to pulverize and pass through a 200-mesh sieve to obtain powder waste PET. Get 42g powder waste PET and 33g glycerin in the three-necked flask, add 0.3gZn(AC) 2 , under the condition of reflux condensation, the temperature was raised to about 240°C, and the PET solid began to dissolve. After the PET solid is dissolved, the temperature of the system is reduced to about 230°C under the condition of reflux condensation. As the reaction progresses, the PET molecules depolymerize continuously, and the reflux condensation temperature of the system decreases continuously. After about 8 hours of reaction, the reflux condensation temperature is about 165°C, and the alcoholysis reaction is ended. When the temperature of the system is lowered to 120°C, take 20g of PET alcoholyzate and 26g of linseed oil in a three-necked flask, add 0.1g of ...

Embodiment 3

[0029] Wash the waste PET with deionized water, put it in an oven at 30-60°C and dry it for 18-30 hours. Put the dried waste PET into a pulverizer to pulverize and pass through a 200-mesh sieve to obtain powder waste PET. Get 45g of powdered waste PET and 30g of glycerol in a three-necked flask, add 0.45g of Zn(AC) 2 , under the condition of reflux condensation, the temperature was raised to about 240°C, and the PET solid began to dissolve. After the PET solid is dissolved, the temperature of the system is reduced to about 230°C under the condition of reflux condensation. As the reaction progresses, the PET molecules depolymerize continuously, and the reflux condensation temperature of the system decreases continuously. After about 12 hours of reaction, the reflux condensation temperature is about 160°C, and the alcoholysis reaction is completed. When the temperature of the system is lowered to 120°C, take 20g of PET alcoholyzate and 30g of linseed oil in a three-necked fla...

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Abstract

The invention relates to a method for preparing an alkyd resin coating by glycerol alcoholysis of waste PET. Firstly, glycerol is used as an alcoholysis agent to alcoholyze the waste PET, Zn(Ac)2 with an amount of 0.5-1.5% by mass that of PET is added as a catalyst, a reaction temperature is 160-240 DEG C and a reaction time is 6-12 h. Then, an alcoholysis product of PET is subjected to a reaction with plant oil, sodium ethoxide with an amount of 0.3-0.6% by mass that of the alcoholysis product of PET and tetra-n-butylammonium bromide with an amount of 0.1-1% by mass that of the alcoholysis product of PET are added as a catalyst. Finally, a plant oil-modified product is subjected to an esterification reaction with phthalic anhydride, dimethylbenzene with an amount of 10-30% by mass that of phthalic anhydride is added as a dehydrating agent, a reaction temperature is 170-190 DEG C and a reaction time is 3-8 h. A certain amount of dimethylbenzene and cobalt naphthenate are added after the reaction is finished to adjust at a temperature of 110-130 DEG C, so that an oil-soluble alkyd resin coating with proper appearance, viscosity and drying time is obtained.

Description

technical field [0001] The invention relates to a method for preparing oil-soluble alkyd resin coatings by using PET (polyethylene terephthalate) waste plastics as raw materials, and belongs to the technical field of recycling resin coatings and waste polymers. Background technique [0002] In recent years, the production of polyester has been increasing, and more and more PET (polyethylene terephthalate) plastics are being discarded. Because waste PET is difficult to degrade naturally under normal conditions. If proper methods are not adopted, it will cause serious environmental pollution on the one hand, and waste non-renewable resources on the other hand. At present, the most important way to deal with waste PET plastics is to directly recycle them. However, because the recycled materials contain impurities, the physical properties will be reduced, and there are problems with transparency and sanitation, so the use is limited. How to recycle waste PET plastic reasonably...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D167/08C08G63/49
Inventor 陈晋阳李皇良邢璐瑶李智练季益梅陈磊吕婧潇
Owner SHANGHAI UNIV