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Preparation method of copolyester for metal powder coating

A metal powder, copolyester technology, applied in powder coatings, polyester coatings, coatings, etc., to achieve the effect of high viscosity strength and good processability

Active Publication Date: 2012-06-13
SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no copolyester resin product using hydroxyethylated bisphenol A as the main polyester raw material. The introduction of hydroxyethylated bisphenol A improves the hardness and heat resistance of the coating, and also improves the acid resistance of the coating Alkaline and Water Resistance

Method used

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  • Preparation method of copolyester for metal powder coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a 2.0L polymerization reactor with a distillation device, add terephthalic acid (244.28g), isophthalic acid (24.92g), ethylene glycol (97.29g), 2-methyl-1,3-propanediol (102.74g), hydroxyethylated bisphenol A (44.89g), butyl stannoic acid (0.45g) and tetrabutyl titanate (0.07g), when the internal temperature of heating reaches 180°C, water begins to distill out, and the temperature continues to rise To 210 ° C, when the distilled water reaches 92% of the theoretical amount, the esterification reaction ends. Then add 0.12 g of triphenyl phosphite, raise the temperature to 240° C., keep the system pressure at 80 Pa, and react for 1 hour to obtain the copolyester product P1.

Embodiment 2

[0020] In a 2.0L polymerization reactor with a distillation device, add terephthalic acid (199.36g) isophthalic acid (49.84g), ethylene glycol (51.36g) 2-methyl-1,3-propanediol (154.11 g) Hydroxyethylated bisphenol A (89.78g), butyl stannoic acid (0.44g) and tetrabutyl titanate (0.08g), when heated to 183°C, water began to distill, continue to heat up to 200°C, wait When the distilled water reaches 90% of the theoretical amount, the transesterification reaction ends. Then add 0.11 g of triphenyl phosphite, raise the temperature to 230° C., keep the system pressure at 110 Pa, and react for 1.5 h to obtain the copolyester product P2.

Embodiment 3

[0022] In a 2.0L polymerization reactor with a distillation device, add terephthalic acid (174.44g), isophthalic acid (74.76g), ethylene glycol (85.60g), 2-methyl-1,3-propanediol ( 116.80g), hydroxyethylated bisphenol A (59.54g), butyl stannoic acid (0.44g) and tetrabutyl titanate (0.08g), when heated to 180°C, water began to distill out, and the temperature continued to rise to 210°C , when the water to be distilled reaches 92% of the theoretical amount, the esterification ends. Then add 0.1 g of triphenyl phosphite, raise the temperature to 250° C., the system pressure is 100 Pa, and react for 1.3 h to obtain the copolyester product P3.

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Abstract

The invention relates to a preparation method of a copolyester for a metal powder coating, mainly comprising the following steps of: (1) carrying out transesterification reaction between terephthalic acid, isophthalic acid, hydroxyethyl bisphenol A and C2-C6 dihydric alcohol under the action of a tetrabutyl titanate / butylhydroxyoxo-stannane catalyst; and (2) adding a stabilizer triphenyl phosphite into the product obtained from Step (1) at atmospheric pressure and carrying out decompressing copolycondensation at 230-250 DEG C and at 80-130 Pa to obtain the copolyester. The obtained copolyester has advantages of steaming and boiling resistance, acid and alkali resistance and strong adhesive force. The coating provided by the invention can be applied in the field of metal can coating.

Description

technical field [0001] The invention relates to a method for preparing a copolyester that can be used as a metal powder coating. The purpose of the present invention is to obtain the copolyester with cooking resistance, acid and alkali resistance and strong adhesion, so that the coating can be applied to the fields of metal can coating and the like. Background technique [0002] Powder coating is a coating that contains 100% solid content, is coated in powder form, and then heated, melted, leveled or cured to form a film. The VOC content of powder coating is low, it is easy to remove, and the oversprayed coating can be recycled and reused; after application, the coating film basically does not produce pinholes, and it is usually easier to apply than liquid coatings, and the durability of the formed coating film is good. Powder coating is a new variety and new technology developed in the 1960s. It has the advantages of saving energy and resources, reducing environmental poll...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08K5/526C09D167/02C09D7/12C09D5/03
Inventor 曾作祥王鲁杰李哲龙朱万育马志艳韩涛
Owner SHANGHAI TIANYANG HOT MELT ADHESIVE CO LTD
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