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”. As Polyurea is known to have short pot life after mixing its monomer components due to quite rapid reaction. Thus its applications have been conventionally limited to a spray coating system. This new Polyurea has longer pot life than conventional polyurea to remain unhardened for hand-painting applications while retaining the advantages of common polyurea (high strength, high durability, and solvent-free).

Features

・No special equipment for painting, no anti-scattering equipment, and no operator training is required.
・It is applicable to complex shapes with thinner coating which has not been accomplished by spray coating system.
・You can get both all good characterics such as higher strength, longer durability with easier handling.

2-component type

Room temperature curable

Solvent-free

Properties and comparison with other products

Items	Unit /Condition	Properties of our products^*1				Competitor's products^*4
Items	Unit /Condition	Strong type TD-123	Normal type BD-085	Clear type CD-032	High elongation type LD-060	Spray type	Hand Paintable
Viscosity	mPa•s (25°C)	Approx. 12,000	Approx. 8,000	Approx. 3,000	Approx. 6,000	-	-
Pot life^*2	25°C	Approx. 15min	Approx. 25min	Approx. 20min	Approx. 2min	-	10-30min
Tack-free time	25°C	Approx. 6h	Approx. 8h	Approx. 16h	Approx. 30min	5-10sec	4-6h
Color	-	Yellow	Yellow	Colorless	Yellow	-	-
Tensile strength	MPa	58	45	33	40	13~34	約10
Tensile elongation	%	6	8	4	400	35～400	900
Surface hardness	Durometer hardness	D75	D65	D50	D50	A75~85 D50~70	A60 D20
Chemical resistance^*3	10% H₂SO₄	Good	Good	Good	Good	Good	Swollen
	5% CH₃COOH	Good	Good	Good	Good	Good	Swollen
	Ca(OH)₂ (saturated)	Good	Good	Good	Good	Good	Swollen
adhesion strength to concrete	N/mm²	>1.5	>1.5	>1.5	-	-	-
abrasion resistance (abrasion loss)	Taber abrasion 1000rpm CS-17,1kg	8-21 mg	82mg	35-170mg	<1mg	35-170mg	25mg

*1: Not a guaranteed value
*2: Time required for viscosity to double. It flows even after the Pot life.
*3: After immersion at 60℃ for 6 days, visually observe the change in appearance.
*4: The values are catalog value.

Adhesion to various substrates

Example of BD-085	Adhesion strength to various s Example of BD-085 ubstrates (N/mm²)
Primer	Concrete	SPCC	SUS304	Al	PC	FRP (Epoxy)	EPS
None	3.3	2.4	1.0	1.8	1.6	2.7	Good
A(Urethane)	>4	>4	>4	>4	-	-	-
B(Acrylic urethane)	>4	>4	1.8	>4	2.7	3.0	-
C(Epoxy)	>4	>4	-	>4	-	-	-

>4: Above the upper limit of the test equipment.
-: No data

Test condition:: After applying the primer and drying for 1 to 3hours, 1mm of polyurea was applied and cured at 40°C for 24hours, after which the adhesion strength was measured using a simple adhesion tester QR-40A.