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Two-Component Blue Polyurethane Topcoat Defoamer Test

2026-06-26

April 6,2026

Test Procedures

Blank Blue Topcoat Testing in a 100 mL graduated cylinder,recording the following parameters:
initial scale reading,foam height after shaking (foam suppression),scale reading after defoaming,time required
for complete defoaming,surface tension.
Add 50g of two-component topcoat to graduated cylinders and test with the following defoamers:TEGO 810,TEGO 902,BYK 028,BYK 024,Anjeka 5062A,Anjeka 5063,Anjeka 26022801 (new).The defoamer added at 0.1%–0.2%. 260401
Drawdown test for cratering evaluation,mixing ratio: paint : curing agent = 4 : 1

Two-Component Low-Temperature Clearcoat Components

Component	Value	Notes
Double Bond 3639H Waterborne Acrylic	69	(Double Bond)
DPNB Solvent Dipropylene glycol n-butyl ether	5
DB Solvent Diethylene glycol butyl ether	3
DPM Solvent Dipropylene glycol methyl ether	3
190 Dispersant 15:4 Blue Paste	20
Total	100

0.1% Defoamer Dosage Test Results

(50g black paint with 0.05g defoamer)

Defoamer Added to Blue Paint	Manufacturer	Original Scale	Foam Inhibiti Height	Height after defoaming	Approximate Time	Surface tension	Generated Foam Volume
Blue paint without defoamer added		49.5	51	49	1.5h	26.69	1
TEGO810	TEGO	49.5	49	49	1.5h	14.47	0
TEGO902	TEGO	49.5	49	48.5	1.5h	12.33	0.5
BYK028	BYK	49.5	49	49	1.5h	15.57	0
BYK024	BYK	49.5	49	49	1.5h	16.24	0
5062A	AJK	49.5	50	48.5	1.5h	10.57	1.5
5063	AJK	49.5	50	48.5	1.5h	18.45	1.5
26022801	AJK	49.5	49	49	1.5h	15.78	0
260401	AJK	49.5	49	49	1.5h	14.39	0

Foam suppression performance of 810, 028, 024, 5061, and 5064 is consistent.

Surface tension: 5062A is the lowest, 5063 is the highest

Defoaming time: consistent with the base paint

0.2% Defoamer Dosage Test Results

0.1% defoamer added to 50g black paint

Defoamer Added to Blue Paint	Manufacturer	Initial Scale (mL)	Foam Height (mL)	Height After Defoaming (mL)	Approx. Time (s)	Surface Tension (mN/m)
Blue paint without defoamer added		49.5	51	49	1.5h	20.98	1
TEGO810	TEGO	49.5	49	49	1.5h	13.24	0
TEGO902	TEGO	49.5	49	49	1.5h	13.71	0
BYK028	BYK	49.5	49.5	49	1.5h	14.49	0.5
BYK024	BYK	49.5	50	49.5	1.5h	13.81	0.5
5062A	AJK	49.5	49.5	49	1.5h	11.69	0.5
5063	AJK	49.5	49.5	48.5	1.5h	13.67	1
5061	AJK	49.5	50.5	49.5	1.5h	13.44	1
5064	AJK	49.5	49	48.5	1.5h	11.88	0.5

Foam suppression: 5063 and 5061 show weaker defoaming; others are consistent

Surface tension: 5062A is the lowest (stronger defoaming)

Gloss & Cratering Evaluation After Drawdown

Defoamer Added to Blue Paint	Thickness um	Manufacturer	0.1% Dosage	Cratering (Y/N)		0.2% Dosage	Cratering (Y/N)
Blue paint without defoamer added	23		89.2/55.4	N
TEGO810	16	TEGO	84.3/53.5	N	23	86.7/69.3	Y
TEGO902	17	TEGO	86.4/60.3	N	25	87.5/75.4	Y
BYK028	26	BYK	81.6/82	N	26	86.4/45.6	N
BYK024	23	BYK	86.0/61.9	N	25	87.7/36.1	N
5062A	19	AJK	80.2/45.3	Y	21	63.3/16.6	Y
5063	21	AJK	85.1/68.2	Slight	24	87.9/76.7	Y
5061	21	AJK	85.4/39.4	N	27	86.5/41.9	N
5064	25	AJK	86.9/45.4	N	26	87.4/43.6	N

Gloss Observation Conclusion

Defoamer dosage at 0.2%,gloss generally increased

5062A: greater impact on gloss

Two-Component Polyurethane Topcoat (Blue) - Wetting Agent Evaluation

Defoamer dosage: 0.1% Wetting agent dosage: 0.3%

Defoamer Added to Blue Paint	Thickness um	Manufacturer	Wetting Agent Model	60°/20° gloss	Cratering (Y/N)
Blue paint without defoamer added	23			89.2/55.4	N
TEGO810	17	TEGO	4100	86.4/45.7	N
TEGO902	14	TEGO	4100	85.7/39.1	N
BYK028	15	BYK	349	85.2/44.5	N
BYK024	16	BYK	349	87.3/70.7	N
5062A	19	AJK	7422	86.6/51.1	N
5063	20	AJK	7422	86.1/45.5	N
5061	17	AJK	7422	84.5/43.8	N
5064	16	AJK	7422	86/42.4	N
5063		AJK	7334	78.6/34.4	N
5062A		AJK	7334	74.3/33.2	N

Gloss performance: 5064 and 024 show the highest gloss

5062A shows more noticeable impact on gloss

No cratering observed in all samples

Final Summary & Recommendation

Gloss test summary: 5064, 028, and 024 show higher gloss; 5063 and 5062A have greater impact on gloss and cause cratering after wetting agent addition, which can be resolved by combining with 7334.

Recommendation: For high-gloss topcoats, 5064 is recommended. For defoaming strength, 5062A is recommended

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