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Defoamer Test For Two-Component Black Polyurethane Topcoat

2026-06-30

Two-Component Black Polyurethane Topcoat Defoamer Test

May 26,2026

Test Procedures

Two-component black polyurethane topcoat test in 100ml graduated cylinder: original graduation, foam suppression height after shaking evenly, graduation after defoaming Time after defoaming, surface tension.
Add 50g two-component black topcoat into the cylinder respectively, add TEGO810, TEGO902, BYK028, BYK024 Anjeka 5062A, Anjeka 5063, Anjeka 26022801 (New) comparative test. Defoamer dosage: 0.1%-0.2%
Squeegee comparative cratering test, Paint: Curing Agent = 4:1

Paint Formulation

Component	Value	Unit/Note
Two-Component Black Polyurethane Topcoat
Water	3
3639H Waterborne Acrylic Dispersion	70	(Double Bond)
DPNB Solvent Dipropylene Glycol Butyl Ether	5
DB Solvent Diethylene Glycol Butyl Ether	3
DPM Solvent Dipropylene Glycol Methyl Ether	3
190 Dispersant MA-100/15% Black Paste	16
Total	100

Defoamer Test Results

0.1% Defoamer Dosage (50g black paint with 0.05g defoamer)

Defoamer Name Added to Black Paint	Manufacturer	Original Graduation	Foam Suppression Heigh	Height After Defoaming	Approximate Time	Surface Tension	Foam Generation Volume
Two-Component Black Paint Without Defoamer		49.5	50	49.5	1.5h	23.23	0.5
TEGO810	TEGO	49.5	50	49	1.5h	19.73	1
TEGO902	TEGO	49.5	50	49	1.5h	16.68	1
BYK028	BYK	49.5	50	49.5	1.5h	19.13	0.5
BYK024	BYK	49.5	51	49	1.5h	17.33	1
5062A	Anjeka	49.5	50	49	1.5h	11.93	1
5063	Anjeka	49.5	53	49	1.5h	11.75	4
5061	Anjeka	49.5	50	49.5	1.5h	15.92	0.5
5064	Anjeka	49.5	51	50	1.5h	14.17	1

In terms of foam suppression, 5063 shows the worst performance, 5061 the best, with others being consistent; defoaming time of all samples is consistent with the base paint; in terms of surface tension, 5062A and 5063 show the lowest values.

0.2% Defoamer Dosage (50g black paint with 0.1g defoamer)

Defoamer Name Added to Black Paint	Manufacturer	Original Graduation	Foam Suppression Heigh	Height After Defoaming	Approximate Time	Surface Tension	Foam Generation Volume
Two-Component Black Paint Without Defoamer		49.5	51	49	1.5h	22.47	1
TEGO810	TEGO	49.5	49.5	49	1.5h	16.77	0.5
TEGO902	TEGO	49.5	49.5	49	1.5h	15.75	0.5
BYK028	BYK	49.5	50	49	1.5h	19.74	1
BYK024	BYK	49.5	49.5	49	1.5h	14.49	0.5
5062A	Anjeka	49.5	50	49	1.5h	13.09	1
5063	Anjeka	49.5	50	49	1.5h	16.93	1
5061	Anjeka	49.5	50	49	1.5h	16.73	1
5064	Anjeka	49.5	50	50	1.5h	15.01	0

In terms of foam suppression, 5064 shows the best performance; in terms of defoaming power, 5062A is the strongest; defoaming time of all samples is consistent with the base paint; in terms of surface tension, 5062A shows the lowest value.

Cratering Test Results

Defoamer Name Added to Black Paint	Manufacturer	0.1% Dosage			0.2% Dosage
Defoamer Name Added to Black Paint	Manufacturer	thickness um	gloss	Cratering (Yes/No)	thickness um	gloss	Cratering (Yes/No)
Two-Component Black Paint Without Defoamer		14.5	81.3/52.3	No	14.5	81.2/55.5	No
TEGO810	TEGO	27	76.9/37.6	Yes	21	84.8/65.8	Yes
TEGO902	TEGO	24	88.6/54.7	No	22	83.6/63.6	Yes
BYK028	BYK	23	81/52.7	No	18	66.5/32.5	No
BYK024	BYK	18	82/55.4	No	17	76.3/34.7	Yes
5062A	Anjeka	21	84.6/46.5	Yes	16	82.1/60.2	Yes
5063	Anjeka	24	84.1/57.6	Yes	17	86.8/73.1	Yes
5061	Anjeka	21	87/71.3	Yes	22	84.4/63.2	Yes
5064	Anjeka		88.3/64.9	Yes		88.165.4	Yes

Based on the comprehensive test results, 5062A offers the strongest defoaming power, suitable for systems requiring fast defoaming; 5064 delivers the best gloss and excellent foam suppression, suitable for topcoat systems with high surface appearance requirements. Both are recommended.

Cratering Test with Wetting Agent

0.2% Defoamer Dosage, 0.3% Wetting Agent Dosage

Defoamer Name Added to Black Paint	Manufacturer	Wetting Agent Details
Defoamer Name Added to Black Paint	Manufacturer	thickness um	Wetting agent Model	60°/20°gloss	Cratering (Yes/No)
Two-Component Black Paint Without Defoamer				81.3/52.3	No
TEGO810	TEGO	27	4100	78.5/42.8	Yes
TEGO902	TEGO	24	4100	88.6/54.7	No
BYK028	BYK	23	349	81/52.7	No
BYK024	BYK	18	349	82/55.4	No
5062A	Anjeka	21	7425A	84.1/57	Yes
5063	Anjeka	24	7425A	84.2/42.2	Yes
5061	Anjeka	21	7425A	87/71.3	Yes
5064	Anjeka		7422	88.3/65.6	No
5063	Anjeka		7334	88.2/70.8	No
5062A	Anjeka		7334	90/77.1	No

After wetting agent addition, 5064 shows the highest gloss. For 5063 and 5062A, adding 7334 can effectively resolve the cratering issue when it occurs.

0.2% Defoamer Dosage, 0.3% Wetting Agent Dosage (Continued)

Defoamer Name Added to Black Paint	Manufacturer	Wetting Agent Details
Defoamer Name Added to Black Paint	Manufacturer	thickness um	Wetting agent Model	60°/20°gloss	Cratering (Yes/No)
Two-Component Black Paint Without Defoamer
TEGO810	TEGO	12	4100	87.1/74.1	Yes
TEGO902	TEGO	14	4100	84.9/70.9	No
BYK028	BYK	17	349	85.2/54.6	No
BYK024	BYK	18	349	86/48.8	No
5062A	Anjeka	12.4	7422	87.1/66.6	No
5063	Anjeka	15	7422	81.9/58.9	No
5061	Anjeka	16.3	7422	89.2/75.1	No
5064	Anjeka		7422	87.5/64.5	No
5063	Anjeka		7334	88.5/69.5	No
5062A	Anjeka		7334	90.8/70.1	No

Summary: 5064 generally shows higher gloss but weaker defoaming performance. For 5062A and 5063, when cratering cannot be resolved, adding 7334 can effectively improve the issue.

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Defoamer Test For Two-Component Black Polyurethane Topcoat

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