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Polyester, preparation method thereof, coating containing polyester, and application of same

A polyester and coating technology, applied in the field of coatings, can solve problems such as difficult handling, and achieve the effect of improving product performance and good adhesion

Inactive Publication Date: 2020-11-03
SHANGHAI WEIKAI CHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Epoxy-phenolic resin systems, due to the possible migration of bisphenol A, a substance that may affect health, are now largely restricted for use in cans.
However, vinyl resin has many problems in its adhesion to metal and the introduction of difficult-to-handle substances during the preparation process.

Method used

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  • Polyester, preparation method thereof, coating containing polyester, and application of same
  • Polyester, preparation method thereof, coating containing polyester, and application of same
  • Polyester, preparation method thereof, coating containing polyester, and application of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of polyester and preparation method thereof, comprise each component of following parts by weight:

[0030]

[0031] Wherein the molar percentage of 2-methylene-4-phenyl-1,3-dioxolane is 12%; the molar percentage of 2-methylene-1,3-dioxane is 12% ; 3,3,3',3'-Tetramethylspirocyclic diphenol has a molar percentage of 20%; polybasic acid has a molar percentage of 30%; polyhydric alcohol has a molar percentage of 26%.

[0032] Its preparation method comprises the following steps:

[0033] A. 1.9kg2-methylene-4-phenyl-1,3-dioxolane, 1.4kg2-methylene-1,3-dioxetane and 6kg3,3,3',3' -Tetramethylspirocyclic diphenol and catalyst 14gK 2 CO 3 Put it into the reaction kettle, replace the air with nitrogen to discharge the air, stir and raise the temperature, and react at 160°C-180°C to obtain the hydroxyl-terminated intermediate.

[0034] B. When the by-products of the first step reaction reach the theoretical value, add 3.3kg of terephthalic acid, 1.7kg of isophthali...

Embodiment 2

[0037] A kind of polyester and preparation method thereof, comprise each component of following parts by weight:

[0038]

[0039] Wherein the molar percentage of 2-methylene-4-phenyl-1,3-dioxolane is 15%; the molar percentage of 2-methylene-1,3-dioxetane is 12% ; 3,3,3',3'-tetramethylspirocyclic diphenol molar percentage is 30%; polyacid molar percentage is 20%; polyhydric alcohol molar percentage is 23%.

[0040] Its preparation method comprises the following steps:

[0041] A. 2.4kg2-methylene-4-phenyl-1,3-dioxolane, 1.4kg2-methylene-1,3-dioxetane and 9kg3,3,3',3' -Tetramethylspirocyclic diphenol and catalyst 32gK 2 CO 3 Put it into the reaction kettle, replace the air with nitrogen to discharge the air, stir and raise the temperature, and react at 160°C-180°C to obtain the hydroxyl-terminated intermediate.

[0042] B. When the first step reaction by-product reaches the theoretical value, add 1.7kg terephthalic acid, 1.5kg adipic acid, 2.4kg neopentyl glycol and 24g ...

Embodiment 3

[0045] A kind of polyester and preparation method thereof, comprise each component of following parts by weight:

[0046]

[0047]

[0048]Wherein the molar percentage of 2-methylene-4-phenyl-1,3-dioxolane is 12%; the molar percentage of 2-methylene-1,3-dioxetane is 10% ; 3,3,3',3'-Tetramethylspirocyclic diphenol molar percentage is 35%; polyacid molar percentage is 25%; polyhydric alcohol molar percentage is 18%.

[0049] Its preparation method comprises the following steps:

[0050] A. Add 1.9kg2-methylene-4-phenyl-1,3-dioxolane, 1.1kg2-methylene-1,3-dioxetane and 10.6kg3,3,3',3 '-Tetramethylspirobiphenol and catalyst 47gK 2 CO 3 Put it into the reaction kettle, replace the air with nitrogen to discharge the air, stir and heat up, and react at 160°C-180°C.

[0051] B. When the first step reaction by-product reaches the theoretical value, add 1.7kg of isophthalic acid, 1.5kg of adipic acid, 1.2kg of ethylene glycol, 0.8kg of 1,4-cyclohexanedimethanol and 45g of ethy...

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Abstract

The invention discloses polyester, a preparation method of the polyester, a coating containing the polyester and application of the same, and relates to the technical field of coatings. The preparation method comprises the following steps: carrying out a ring-opening reaction on 2-methylene-4-phenyl-1,3-dioxolane with the molar content of 10-20%, 2-methylene-1,3-dioxoheptane with the molar contentof 10-20%, and 3,3,3',3'-tetramethylspirobiphenol with the molar content of 20-40% to obtain a hydroxyl-terminated intermediate; and then reacting with dicarboxylic acid with the molar content of 20-30% and dihydric alcohol with the molar content of 15-30% to obtain the polyester resin; and compounding the resin to obtain the coating applied to a metal coating. The product has good metal adhesion, excellent resistance and outstanding processability.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a polyester and a preparation method thereof, a coating containing the polyester and its application, in particular to a polyester with high resistance and metal adhesion, a preparation method thereof and a coating containing the polyester. Ester coatings and their applications. Background technique [0002] With the gradual improvement of people's living standards, more and more people pursue a high-quality life and pay special attention to food safety issues. Therefore, today's food safety has naturally become a worldwide challenge and a topic of public health concern. [0003] At present, the inner coating of metal cans for food in my country is mainly epoxy resin and organic sol resin, which are often used to protect metal cans from the corrosion of the contents, which can prevent heavy metals in metal cans from migrating to food and increase the shelf life. [0004] The Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/199C09D167/02
CPCC08G63/672C08G63/199C09D167/02
Inventor 虞明东蒋天龙
Owner SHANGHAI WEIKAI CHEM
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