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Method for preparing powder paint polyesters by discarded polyester decomposing reclamation

A technology for powder coating and waste polyester, applied in powder coatings, polyester coatings, recycling technology and other directions, can solve the problems of complex composition of waste polyester alcoholysis products and difficulty in determining the average molecular weight of degradation products.

Inactive Publication Date: 2008-05-14
宁波市鄞州天顺塑粉厂 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the complex composition of waste polyester alcoholysis products and the difficulty in determining the average molecular weight of degradation products, etc.

Method used

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  • Method for preparing powder paint polyesters by discarded polyester decomposing reclamation
  • Method for preparing powder paint polyesters by discarded polyester decomposing reclamation
  • Method for preparing powder paint polyesters by discarded polyester decomposing reclamation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] [Example 1] Comparative experiment of compound heating and simple microwave heating depolymerization effect

[0033] Mix 100 parts of waste polyethylene terephthalate bottle flakes (1-10mm), 40 parts of ethylene glycol and 1 part of zinc acetate catalyst into a self-made reactor, and stir for 4 minutes with an electric mixer at 120r / min , after stirring evenly, put the reactor into an infrared heating box (set the temperature at 220°C) to heat for 0-20min, then put the reactor into a microwave oven to set the reaction conditions (frequency is 2450MHz, microwave power is 528W) Carry out microwave radiation for 0-15min. The prerequisite is that the power consumption of compound heating and simple microwave heating is the same. The experimental results are shown in Table 1.

[0034] Table 1

[0035]

[0036] (Alcohol volatilization refers to the amount of alcohol added)

[0037] It can be seen from the experiment that under the same power consumption, the alcoholysis...

Embodiment 2

[0038] [Example 2] Composite heating depolymerization experiment

[0039] Mix 100 parts of waste polyester bottle flakes (1-10mm), 40 parts of ethylene glycol and 0.1 part of zinc acetate catalyst into the self-made reactor, stir with an electric mixer at 180r / min for 3min, after stirring evenly, put the reaction The reactor was first placed in an infrared heating box (the temperature was set to 220°C) for heating for 0-20 minutes, and then the reactor was placed in a microwave oven to set the reaction conditions (frequency 2450MHz, microwave power 680W) for 0-13 minutes of microwave radiation. The experimental results are shown in Table 2.

[0040] Table 2

[0041]

Embodiment 3

[0042] [Example 3] Composite heating depolymerization experiment

[0043]Mix 100 parts of waste polyester bottle flakes (1-10mm), 60 parts of ethylene glycol and 1 part of zinc acetate catalyst into the self-made reactor, stir with an electric mixer at 150r / min for 3min, after stirring evenly, put Put it into an infrared heating box (the temperature is set to 220°C) and heat for 0-1h, then put it into a microwave oven to set the reaction conditions (frequency is 2450MHz, microwave power is 528W), and microwave radiation is carried out for 0-10min. The experimental results are shown in Table 3.

[0044] table 3

[0045]

[0046]

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PUM

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Abstract

The invention discloses a method of preparing the polyester used for powder paint by decomposing and recycling the waste polyethylene terephthalate; wherein, the waste polyethylene terephthalate, dihydric alcohol and zinc acetate catalyst are put into a reactor in proper proportion, and are mixed evenly by an electric mixer at the rate of 30 to 500 r / min, and then put into an infra-red heating container and heated for 0 to 1 hour under the temperature of 190 DEG C to 260 DEG C and then put into a micro-wave oven, and heated for 0 to 15 minutes under the power of 500 to 2000 W; subsequently, such polyatomic acids as adipic acid or terephthalic acid as well as esterifying catalyst antimony trioxide are added in the depolymerized products according to the proportion and esterification polycondensation is conducted in the micro-wave oven for 0 to 10 minutes to generate the polyester used for powder paint. By making use of waste polyester to prepare the polyster used for powder paint, the invention has the advantages of simple and easily controllable process, low cost and broad market prospect in paint industry.

Description

technical field [0001] The invention relates to a composite depolymerization method for recycling waste polyethylene terephthalate and a method for producing polyester for powder coatings, in particular to waste polyethylene terephthalate under microwave and infrared composite heating conditions alcoholysis and esterification. Background technique [0002] With the rapid growth of the powder coating industry, it is estimated that the output of my country's powder coating market will reach 400,000-450,000 tons in 2010, the annual demand for polyester will be 150,000-200,000 tons, and the demand for polyester resin will increase by 15% per year. speed growth. Although my country's polyester resin products can basically meet the requirements of users, there is still a certain gap between performance and price and market demand. Therefore, how to manufacture low-cost, high-performance polyester resins has become an important research direction. [0003] Although waste polyethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/24C08G63/78C08G63/85C09D167/00C09D5/03
CPCY02W30/62
Inventor 许忠斌逯德木郑素霞佟立芳方征平胡立勤
Owner 宁波市鄞州天顺塑粉厂