Unlock instant, AI-driven research and patent intelligence for your innovation.

Polyester resin, and preparation method and application thereof

A technology of polyester resin and acetoxy, which is applied in the field of polymer synthesis and can solve problems such as incomplete ring-opening polymerization and initiator residues

Active Publication Date: 2020-10-30
SHANGHAI CHENGYING NEW MATERIALS +2
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese invention patent with publication number 110511640A proposes a polyester coating without bisphenol A, which uses 2-methylene-1,3-dioxepane, glycidyl methacrylate and Acrylic monomer first synthesizes an epoxy-modified polyester resin, and then cooperates with phenolic resin to obtain a can coating without bisphenol A monomer, which may cause problems such as incomplete ring-opening polymerization and initiator residue.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polyester resin, and preparation method and application thereof
  • Polyester resin, and preparation method and application thereof
  • Polyester resin, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A polyester resin comprising:

[0026]

[0027] Wherein the molar content of glycol is 1.4 times of the total molar content of dicarboxylic acid and 4-acetoxy-3-methoxybenzoic acid; the molar content of 4-acetoxy-3-methoxybenzoic acid It is 12% of the total molar content of dicarboxylic acid and 4-acetoxy-3-methoxybenzoic acid.

[0028] A polyester resin and a preparation method thereof, comprising the steps of: 25.2kg 4-acetoxy-3-methoxybenzoic acid, 146kg terephthalic acid, 57kg 1,2-propylene glycol, 36kg isosorbide, 24.8 kg of ethylene glycol and 72g of isopropyl titanate were put into the reaction kettle, the air was replaced with nitrogen, the temperature was raised with stirring, and the reaction was carried out between 220°C and 240°C. When the by-product reaches the theoretical value, reduce the pressure and polymerize, the reaction temperature is 250°C-280°C, stop the reaction after reaching the end point, fill with nitrogen to eliminate the vacuum, and ext...

Embodiment 2

[0030] A polyester resin comprising:

[0031]

[0032] Wherein the molar content of glycol is 1.2 times of the total molar content of dicarboxylic acid and 4-acetoxy-3-methoxybenzoic acid; the molar content of 4-acetoxy-3-methoxybenzoic acid It is 20% of the total molar content of dibasic carboxylic acid and 4-acetoxy-3-methoxybenzoic acid.

[0033] A polyester resin and a preparation method thereof, comprising the steps of: 42kg 4-acetoxy-3-methoxybenzoic acid, 35kg succinic acid, 83kg isophthalic acid, 38kg 1,2-propanediol, 57kg1, 4-Cyclohexanedimethanol, 18.6kg of butanediol, and 65g of isopropyl titanate were put into the reaction kettle, and the air was replaced with nitrogen to discharge the air, stirred and heated up, and reacted between 220°C and 250°C. When the by-product reaches the theoretical value, reduce the pressure and polymerize, the reaction temperature is 250°C-280°C, stop the reaction after reaching the end point, fill with nitrogen to eliminate the vac...

Embodiment 3

[0035] A polyester resin comprising:

[0036]

[0037] Wherein the molar content of glycol is 1.6 times of the total molar content of dicarboxylic acid and 4-acetoxy-3-methoxybenzoic acid; the molar content of 4-acetoxy-3-methoxybenzoic acid It is 30% of the total molar content of dicarboxylic acid and 4-acetoxy-3-methoxybenzoic acid.

[0038] A polyester resin and a preparation method thereof, comprising the steps of: 63kg 4-acetoxy-3-methoxybenzoic acid, 25kg terephthalic acid, 41.5kg isophthalic acid, 87kg 1,2-propylene glycol, 9.3kg of neopentyl glycol, 43kg of ethylene glycol, and 95g of zinc acetate were put into the reaction kettle, and the air was replaced with nitrogen to discharge the air, stirred and heated up, and reacted between 220°C and 250°C. When the by-product reaches the theoretical value, reduce the pressure and polymerize, the reaction temperature is 250°C-280°C, stop the reaction after reaching the end point, fill with nitrogen to eliminate the vacuum...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
glass transition temperatureaaaaaaaaaa
hydroxyl valueaaaaaaaaaa
Login to View More

Abstract

The invention discloses polyester resin, and a preparation method and application thereof, belonging to the field of polymer synthesis. The polyester resin is prepared from dicarboxylic acid, 4-acetoxy-3-methoxybenzoic acid, dihydric alcohol and a catalyst through a step-by-step polymerization process. The polyester resin has a number-average molecular weight of 5000 to 350000, a glass transitiontemperature of 70-150 DEG C and a hydroxyl value of 4-30 mgKOH / g. Compared with existing common resin, the polyester resin provided by the invention has very good adhesion to a metal coating, and alsohas very high hardness and flexibility.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a polyester resin and its preparation method and application, in particular to a polyester resin and its preparation method and its application in metal coatings. Background technique [0002] Generally, the inner surface of metal cans for food and beverages needs to be coated for the purpose of corrosion of the can material. Epoxy resin coatings are often used to coat the inner walls of metal containers due to their better performance; however, recently due to expectations for food packaging safety requirements, it is desirable to develop alternative safer coating technologies. [0003] The Chinese invention patent with publication number 110511640A proposes a polyester coating without bisphenol A, which uses 2-methylene-1,3-dioxepane, glycidyl methacrylate and Acrylic monomer first synthesizes an epoxy-modified polyester resin, and then cooperates with phenolic resin to obtain...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08G63/78C09D167/02
CPCC08G63/672C08G63/78C09D167/02
Inventor 虞明东蒋天龙
Owner SHANGHAI CHENGYING NEW MATERIALS