Comparative Performance Testing of EEP vs. PMA in 2K Epoxy Coatings

Experimental Purpose and Conditions

Apply the new solvent EEP and the traditional solvent PMA respectively in a 2K epoxy paint system. Compare the performance differences generated by the two in the 2K epoxy paint system by analyzing the results of a series of performance tests.

Test Conditions: Temperature 25-27°C, Humidity 55-65%.

Test Basis: Reference to HG/T4566-2013 Epoxy Resin Primer Industry Standard.

Experiment Design and Data Analysis

Technical Parameters of Main Raw Materials:

1. Clear Coat Preparation

Clear Coating Main Agent Formula:

No.	Material	Dosage A1	Dosage A2	Supplier	Production Process
1	NPEF-170 Epoxy Resin	50	50	NAN YA	Add raw materials in sequence, disperse at medium speed 500 rpm for 10 minutes;
2	White Paste	45	45	Commercial
3	EEP	5	–	PREC
4	PMA	–	5	Commercial
	Total	100	100

Paint Curing Agent B Formula:

No.	Material	Dosage	Supplier
1	Polyamide Curing Agent	50	Commercial
2	Xylene	35	Commercial
3	n-Butanol	15	Commercial

Diluent Formula:

No.	Material	Dosage	Supplier
1	Xylene	100	Commercial

2K EP (EEP) Ratio Main Agent A1: Curing Agent B: Diluent C = 100:100:15
2K EP (PMA) Ratio Main Agent A2: Curing Agent B: Diluent C = 100:100:15

2. System Test Results and Analysis

No.	Test Items	Test Standards	Requirement	Test Results
				2K EP (EEP)	2K EP (PMA)
1	Pot Life Viscosity (Clear Coating), S/T-2
	Initial	–	Measured	26.54	26.85
	1 hour	–	Measured	35.38	36.57
	3 hours	–	Measured	48.68	50.78
	5 hours	–	Measured	76.47	78.31
	Pot Life Adhesion, grade (Tinplate sanded)
	Initial	–	≤1	1	1
	1 hour	–	≤1	1	1
	3 hours	–	≤1	1	1
	5 hours	–	≤1	2	2
2	Clear Coating Viscosity, mPa.s@25.5°C	GB/T 2794-2013	Measured	784.79	849.93
3	Drying Time
	Touch Dry, h	GB/T 1728-1979	≤4	2	2
	Hard Dry, h	GB/T 1728-1979	≤24	20	20
4	Film Appearance	–	Normal	Normal	Normal
5	Thickness (Flow Coating), μm	–	Measured	60.3	65.6
6	Gloss at 20°/60°/85°	GB/T 9754-2007	Measured	93.5/99.5/99.4	93.5/99.0/99.0
7	Pencil Hardness (Scratch – Zhonghua)	GB/T 6739-2006	Measured	H	H
8	Cross-Cut Test, grade	GB/T 9286-1998	≤1	1	1
9	Impact Resistance, cm	GB/T 1732-1993	50	No cracking	No cracking

Experimental Conclusion

Through the comparison of data from the series of tests, it was found that:

1. The viscosity of the EEP group during pot life is slightly lower than that of the PMA group, indicating that 2K EP (EEP) has a slightly better viscosity reduction effect; the gloss angle data shows that 2K EP (EEP) has slightly higher gloss.
2. The adhesion, hardness, drying time, impact resistance, and other properties of 2K EP (EEP) and 2K EP (PMA) are the same. These results indicate that EEP holds significant potential for application in various fields, including automotive coatings, marine paints, structural steel coatings, industrial finishes, floor coatings, anticorrosive paints, adhesives, and electronic materials.

For further details on PREC’s functional solvents, please visit: Solvant PREC EEP