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Preparation method of polyester modified epoxy resin for coiled material primer

A technology for modification of epoxy resin and polyester, applied in the direction of primer, coating, etc., can solve the problem of poor compatibility between epoxy resin and polyester resin, T-bending of coating film, poor impact resistance, paint poor storage stability

Inactive Publication Date: 2021-05-11
万博新材料科技(南通)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compatibility between epoxy resin and polyester resin is not good, and the storage stability of the paint is relatively poor, resulting in delamination of the paint, T-bending of the coating film, and poor impact resistance.

Method used

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  • Preparation method of polyester modified epoxy resin for coiled material primer
  • Preparation method of polyester modified epoxy resin for coiled material primer
  • Preparation method of polyester modified epoxy resin for coiled material primer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 127g of methylpropanediol, 149g of diethylene glycol, 324g of adipic acid and 0.3g of monobutyltin oxide into the reaction kettle, slowly raise the temperature to 250°C, control the reaction time at 8h, and finally the acid value reaches 3mg KOH / g, Water yield 80g, obtain polyester intermediate. Then add 140g of epoxy resin E-12 and 40g of polyester intermediate into the reaction kettle, raise the temperature to 100°C, add 0.3g of triphenylphosphine, slowly raise the temperature to 180°C, and keep it warm for 4h to obtain polyester modified epoxy Resin is then diluted with 90g heavy aromatic solvent, 70g DMF, 15g n-butanol and 5g xylene to form a dilution of 50% polyester-modified epoxy resin by mass percent solids.

[0027] The performance test is as follows:

[0028]

[0029] Note: The molecular weight test results are derived from the GPC number average molecular weight test results.

Embodiment 2

[0031] Add 124g of neopentyl glycol, 126g of diethylene glycol, 127g of isophthalic acid, 223g of sebacic acid and 0.3g of monobutyltin oxide into the reaction kettle, slowly raise the temperature to 250°C, and control the reaction time at 10h. The value reaches 4mgKOH / g, and the water yield is 70g to obtain a polyester intermediate. Then add 130g of epoxy resin E-06 and 45g of polyester intermediate into the reaction kettle, raise the temperature to 100°C, add 0.3g of triphenylphosphine, slowly raise the temperature to 180°C, and keep it warm for 4h to obtain polyester modified epoxy The resin is then diluted with 100g of heavy aromatic solvent, 60g of DMF, 10g of n-butanol and 5g of xylene to form a dilution of 50% polyester-modified epoxy resin by weight of the solids.

[0032] The performance test is as follows:

[0033]

[0034] Note: The molecular weight test results are derived from the GPC number average molecular weight test results.

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Abstract

The invention provides a preparation method of polyester modified epoxy resin for coiled material primer, and particularly relates to the technical field of polymer synthesis and coatings. The preparation method comprises the steps of taking dihydric alcohol and dibasic acid as raw materials, under the action of a catalyst 1, gradually increasing the temperature to 230-250 DEG C, controlling the reaction time to be 5-10h till the acid value is less than or equal to 5mg KOH / g, and obtaining a polyester intermediate; and adding the polyester intermediate and epoxy resin into a reaction kettle, heating to the temperature of 100-120 DEG C, adding a catalyst 2 after the resin is completely dissolved, heating to 180-200 DEG C, keeping the temperature for 2-4 hours to obtain polyester modified flexible epoxy resin, and diluting with a solvent until the solid content is about 40-50%. The epoxy group of the epoxy resin reacts with the hydroxyl or carboxyl on the linear polyester resin, and the flexible polyester resin is grafted to the epoxy resin, so that the newly prepared modified epoxy resin has the advantages of the epoxy resin and the polyester resin, the prepared paint film has excellent resin and paint storage stability, and various performance requirements of the primer for the coiled material can be met.

Description

technical field [0001] The invention belongs to the field of polymer synthesis and coating technology, and in particular relates to a preparation method of a polyester-modified epoxy resin for a coil primer. Background technique [0002] Bisphenol A epoxy resin is widely used in metal coil primer coatings, because there are many hydroxyl groups and ether bonds in epoxy resin paint, which can attract polar substrates (such as steel, aluminum, concrete, etc.), showing Excellent adhesion; when the epoxy group in the epoxy resin and the curing agent are ring-opened and polymerized, the polymerized atoms are always connected by covalent bonds, the volume changes little after polymerization, and the paint film does not shrink; there are only hydrocarbon groups in the resin And ether bond, excellent anti-corrosion performance; at the same time, epoxy resin also contains two active groups of epoxy group and hydroxyl group, which can be cured with polyamine, polyamide, amino resin, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C09D187/00C09D5/00
CPCC08G81/00C08G59/14C09D187/005C09D5/002
Inventor 朱桂刚张引张亚储晖吴桂军
Owner 万博新材料科技(南通)有限公司