UNITIKA | Technology | Development Products | Polyurea for hand-painting

Solvent-free, high durability, room temperature curable

Polyurea for hand-painting
“Sterralock™”

Hand-paintable polyurea with long pot life, high strength, high durability, and easy handling.

Polyurea is also known as “stainless-steel like resin” or “100-year coating”, and also known to have short pot life due to rapid reaction. Thus applications of conventional polyurea have been limited to a spray coating system. The New Polyurea Sterralock breaks these limits. It has extended pot life without compromising the core benefits (high strength, high durability, and solvent-free).

Features

・No special equipment for painting, no anti-scattering equipment, or no operator training are required.
・Thin-film coating on complex shapes—a feat unattainable with conventional spray systems.
・Higher strength, longer durability with easier handling.

We have also developed a clear, colorless type.

Material properties and comparison with competing products

Items	Unit / condition	Properties of our products^*1			Competitor's products^*5
Items	Unit / condition	TD-123	FD-031	AD-051	Spray type	Hand paintable
Features	-	Strong, hard	Strong, flexible	Colorless	-	-
Mix ratio	A / B	100/135	100/390	100/135	-	-
Solids content	%	100	100	100	100	95-100
Viscosity	mPa•s (25°C)	6000-10000	2000-3000	5000	-	-
Estimated working time		30-45min	15-20min	10-15min
Tack-free time	25°C	4hr	30min	50min	5-10sec	4-6hr
Color	-	Yellow	Yellow	Colorless	-	-
Haze^*2	%	13.81	5.01	1.45	-	-
Tensile strength^*3	MPa	58	49	20	13~34	約10
Tensile elongation^*3	%	6	590	200	35-400	900
Hardness	Durometer hardness	D75	D40	D55	A75~85 /D50~70	A60 /D20
Chemical resistance^*4	10%H₂SO₄	Good	Good (Slightly color changed)	Good	Good	Swollen
	Ca(OH)₂ (saturated)	Good	Good	Good	Good
	5% CH₃COOH	Good	Slightly swollen	Good	Good
Adhesion strength to concrete	N/mm²	>4	>4	>4	-	-
Abrasion resistance (abrasion loss)	Taber abrasion 1000rpm CS-17,1kg	8~21mg	<1mg	5mg	35-170mg	25mg

*1: Not a guaranteed value
*2:.No additives type
*3: After 7days curing at 25℃. Tensile speed 500mm / min.
*4: After immersion at 60℃ for 6 days, visually observe the change in appearance.
*5: The values are catalog value.