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Epoxy modified saturated polyester resin for undercoat of coil coating and undercoat of coil coating

A coil coating and epoxy modification technology, applied in the direction of anti-corrosion coatings, polyester coatings, coatings, etc., can solve the problems of weak deformation and weather resistance, little performance improvement, and poor miscibility, etc., to achieve comprehensive Effect of performance improvement, strong adhesion and corrosion resistance, good surface hardness and weather resistance

Active Publication Date: 2013-03-27
WUXI HUHUANG PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Epoxy paint has strong adhesion and corrosion resistance to metals, but is relatively weak in deformation and weather resistance
The most common coil coatings on the market are cold blend resins. We hope to use the complementary properties of the resins to improve the performance of the product. There is one more process, which is more troublesome. There are also two requirements for resin compatibility, which is not good. still can't fight coldly
The performance improvement does not reach the ideal purpose and the best effect

Method used

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  • Epoxy modified saturated polyester resin for undercoat of coil coating and undercoat of coil coating
  • Epoxy modified saturated polyester resin for undercoat of coil coating and undercoat of coil coating
  • Epoxy modified saturated polyester resin for undercoat of coil coating and undercoat of coil coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of Epoxy Modified Saturated Polyester Resin

[0030] By weight, the content of each component in the epoxy modified saturated polyester resin is:

[0031]

[0032] Formula construction process: Put methyl propylene glycol, epoxy resin 609, isophthalic acid, adipic acid, neopentyl glycol and dibutyltin dilaurate into the reaction kettle in proportion, raise the temperature to 130°C, start stirring, React at ℃ for 2 hours, slowly raise the temperature to 180℃, keep it for 1 hour, continue to raise the temperature to 200℃ for continuous esterification reaction until the resin is transparent, cool down to below 180℃, add xylene, heat up to xylene reflux (200℃~220℃ ), reflux reaction until the acid value of the resin is ≤5 mgKOH, lower the temperature to below 180°C, add S-150# and propylene glycol methyl ether in proportion to dilute, stir evenly, filter, discharge, and pack.

Embodiment 2

[0033] Example 2 Preparation of Epoxy-modified Saturated Polyester Resin

[0034] By weight, the content of each component in the epoxy modified saturated polyester resin is:

[0035]

[0036]

[0037] Formula construction process: Put methyl propylene glycol, epoxy resin 609, isophthalic acid, adipic acid, neopentyl glycol and dibutyl tin oxide into the reaction kettle in proportion, raise the temperature to 135°C, start stirring, and react at 148°C For 2 hours, slowly raise the temperature to 180°C, keep it for 1 hour, continue to heat up to 205°C for continuous esterification reaction until the resin is transparent, cool down to below 180°C, add xylene, heat up to xylene reflux, and reflux reaction until the acid value of the resin is ≤ 5 mgKOH, lower the temperature to below 180°C, add S-150# and propylene glycol methyl ether in proportion to dilute, stir evenly, filter, discharge, and pack.

Embodiment 3

[0038] Example 3 Preparation of Epoxy-modified Saturated Polyester Resin

[0039] By weight, the content of each component in the epoxy modified saturated polyester resin is:

[0040]

[0041] Formula construction process: Put methyl propylene glycol, epoxy resin 609, isophthalic acid, adipic acid, neopentyl glycol and monobutyl tin oxide into the reaction kettle in proportion, raise the temperature to 128°C, start stirring, and react at 145°C After 2.5 hours, slowly raise the temperature to 180°C, keep it for 1 hour, continue to heat up to 205°C for continuous esterification reaction until the resin is transparent, cool down to below 180°C, add xylene, heat up to xylene reflux, and reflux until the acid value of the resin is ≤ 5 mgKOH, lower the temperature below 180°C, add S-150# and propylene glycol methyl ether in proportion to dilute, stir evenly, filter, discharge, and pack.

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Abstract

The invention discloses an epoxy modified saturated polyester resin for an undercoat of a coil coating and the undercoat of the coil coating. The epoxy modified saturated polyester resin comprises the following components in parts by weight: 50-80 parts of methylpropanediol, 100-140 parts of epoxy resin 609, 110-150 parts of isophthalic acid, 110-150 parts of hexanedioic acid, 105-145 parts of neopentyl glycol, 0.1-0.6 part of organic tin, 20-40 parts of dimethylbenzene, 380-500 parts of S-150# solvent oil and 30-60 parts of propylene glycol monomethyl ether. The prepared epoxy modified saturated polyester resin is applied to the undercoat of the coil coating, so that the undercoat of the coil coating is high in adhesion and corrosion resistant performance to metals, high in machinability, high in deformation property under high surface hardness and weather ability and low in cost, and the comprehensive performance is obviously improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an epoxy-modified saturated polyester resin for a coil coating primer and a coil coating primer. Background technique [0002] With the continuous maturity of technology, coil coatings are developing rapidly. Now coil coatings on the market mainly include polyester resin coil coatings, acrylic resin coil coatings, and epoxy resin primer coatings. Coil coatings composed of polyester resins have high processability and excellent deformability with good surface hardness. Acrylic resin coil coating has good hardness and weather resistance, and the processability is average. Epoxy paint has strong adhesion and corrosion resistance to metals, but is weak in deformation and weather resistance. The most common coil coatings in the market are cold blend resins. We hope to use the complementary properties of the resins to improve the performance of the product. There is one m...

Claims

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Application Information

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IPC IPC(8): C08G63/20C08G63/78C09D167/02C09D7/12C09D5/08
Inventor 翟维忠胡胜初费明
Owner WUXI HUHUANG PAINT
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