Modification of Waterborne Polyester Resin and Its Application in Color Steel Plate Coatings

doi:10.19894/j.issn.1000-0518.250075

Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (11): 1500-1509.DOI: 10.19894/j.issn.1000-0518.250075

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Modification of Waterborne Polyester Resin and Its Application in Color Steel Plate Coatings

De-Fa ZHOU, Long-Bao YU()

School of Chemistry and Chemical Engineering，Jiangsu University，Zhenjiang 212000，China

Received:2025-02-26 Accepted:2025-10-09 Published:2025-11-01 Online:2025-12-05
Contact: Long-Bao YU
About author:longbaoyu@ujs.edu.cn

Abstract

Abstract:

Using trimellitic anhydride， adipic acid and neopentyl glycol as raw materials， along with dibutyl tin dilaurate as catalyst， the unmodified water-based polyester resin was synthesized through a xylene reflux dehydration polycondensation reaction process. The water-based polyester resins modified with polycaprolactone diol and hydrophobic functional monomer （TWG-01） respectively， were prepared utilizing the same polycondensation reaction methodology. The application of these water-based polyester resins in white topcoats for color steel plate was investigated. Experimental results indicated that in the absence of dispersants or co-solvents， the white topcoat for colour steel plates， prepared from unmodified water-based polyester resin， exhibited poor storage stability， and the coating film gloss is only 38%. In contrast，the white topcoat for color steel plate prepared from hydrophobically modified water-based polyester， exhibited good storage stability， and the cured coating film achieved a film gloss of up to 90%. A cross-cut test rating of 0， a pencil hardness of 3H， a T-bend rating of 1T， a reverse impact resistance of 100 kg·cm， and a cup indentation test result of 7.0 mm. These performance indexes of the coating film matched that of the pre-coated coil coating standard （HG/T 3830-2022）. Furthermore， scanning electron microscopy （SEM） analysis revealed that the gloss of the coating film is closely related to dispersion of pigment particles within the film， and the traditional polyacrylate dispersant can lead to aggregation of pigment particles in the coating film.

Key words: Waterborne polyester resin, Color steel plate coating, Modification

CLC Number:

O633

De-Fa ZHOU, Long-Bao YU. Modification of Waterborne Polyester Resin and Its Application in Color Steel Plate Coatings[J]. Chinese Journal of Applied Chemistry, 2025, 42(11): 1500-1509.

Figures/Tables 10

References 21

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Types of water-based polyesters	Unmodified	Polycaprolactone diol modified	Hydrophobically modified
The appearance of resin	Clear and transparent	Clear and transparent	Milky white
M_n	1 478	1 725	1 579
* Acid value/（mg KOH·g^-1）	128.79	130	104.2
Solid content/%	59.2	60.1	59.8
Viscosity/（mPa·s）	1 132.3	1 029.2	1 428.7
Glossiness/%	119	121	115

Types of water-based polyesters	Unmodified	Polycaprolactone diol modified	Hydrophobically modified
The appearance of resin	Clear and transparent	Clear and transparent	Milky white
M_n	1 478	1 725	1 579
* Acid value/（mg KOH·g^-1）	128.79	130	104.2
Solid content/%	59.2	60.1	59.8
Viscosity/（mPa·s）	1 132.3	1 029.2	1 428.7
Glossiness/%	119	121	115

Samples	S-1	S-2	S-3
Types of water-based polyesters	Unmodified	Unmodified	Unmodified
Dispersant	/	Sodium polyacrylate	BYK-190
m（pigment）/m（resin）	0.5	0.5	0.5
Fineness/μm	≤15	≤15	≤15
Glossiness/%	38	44	85
Coating storage stability	A bit of layered water， hard precipitation	A bit of layered water， hard precipitation	A bit of layered water， soft precipitation

Samples	S-1	S-2	S-3
Types of water-based polyesters	Unmodified	Unmodified	Unmodified
Dispersant	/	Sodium polyacrylate	BYK-190
m（pigment）/m（resin）	0.5	0.5	0.5
Fineness/μm	≤15	≤15	≤15
Glossiness/%	38	44	85
Coating storage stability	A bit of layered water， hard precipitation	A bit of layered water， hard precipitation	A bit of layered water， soft precipitation

Samples	S-4	S-5	S-6
Types of water-based polyesters	Unmodified	Unmodified	Unmodified
Co-solvent	DPNB	PM	PME
Dosage/%	5	5	5
Pigment/Resin dry heavy	0.5	0.5	0.5
Fineness/μm	≤15	≤15	≤15
Glossiness/%	73	72	75
Coating storage stability	A bit of layered water， soft precipitation	A bit of layered water， soft precipitation	A bit of layered water， soft precipitation

Modification of Waterborne Polyester Resin and Its Application in Color Steel Plate Coatings

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Performances	Indicator	Standard
State in the container	After stirring， there are no lumps， and it is in a uniform state	After stirring， there are no lumps， and it is in a uniform state
Non-volatile matter content/%	58	≥55
Fineness/μm	≤15	≤25
MEK-resistant wiping/times	100	100
Glossiness/%	90	Agreed
Hardness	3H	≥H
Impact （direct. reverse）/（kg·cm）	100	90
T-bend（T）	1	≤1
Grid test （Level）	0	1
Cup burst test/7 mm	No shedding	No shedding
Acid resistance	No abnormalities	No abnormalities
Alkali resistance	No abnormalities	No abnormalities

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