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KAMTHANE K- 1492 is our "work-horse" aqueous aliphatic polyurethane dispersion designed for coating rigid substrates, such as concrete, metal, plastic, tiles, polycarbonate, marble and wood. It has excellent durability and displays good UV resistance.
|Type||:||anionic, aliphatic dispersion|
|Total solids (% w/w)||:||34% ±1|
|Viscosity, cps||:||60- 250 cps|
|Density of dipsersion (kg/l)||:||1.05|
|Elongation at break||:||200%|
High clarity, Hard and flexible
Excellent water and alkali resistant
Excellent abrasion, chemical & impact resistance.
Good alcohol resistance
Adhesion to many substrates.
Concrete & rigid substrate coatings
Industrial waterproofing coatings
Multi-surface & paint coatings
Metal, plastic & wood coatings
The addition of wetting and/ or levelling agents and defoamers is required.
The chemical and mechanical properties of Kamthane K-1492 can be enhanced with
small amount selected silanes & other crosslinkers.
Kamthane K-1492 can be formulated with suitable coalescents and matting agents.
Kamthane K -1492 is compatible with a wide range of acrylics.
Kamthane K-1492 is an air dry, water-borne urethane, specifically designed for high performance uses, where hardness, flexibility, chemical and abrasion resistance are required. The aliphatic backbone of Kamthane K-1492 results in excellent UV resistance, permitting its use in exterior coating applications. Although Kamthane K-1492 provides good water and solvent resistance properties in properly formulated coating systems, these properties can be substantially enhanced, in certain critical applications, by addition of an air-dry crosslinking agent such as Aziridines, ater based isocyanate hardners and Silanes.Crosslinkers improve the adhesion characteristics for special substrates.
For many applications, blends of Kamthane K-1492 urethane dispersions with water-borne acrylics have been found useful. Kamthane K-1492 shows good compatibility with some of Kamsons water-borne acrylics, and results in stronger adhesion to wood and certain plastics, as well as improved intercoat adhesion. Kamthane K-1492 can be used to formulate coating for all type of substrates; metals, plastics and wood.
|Total solids, by weight,||34 %|
|pH||7.0 – 8.5|
|Viscosity, Brookfield, 25°C,||200 - 400 cps|
|Specific gravity of solids @ 25°C||1.14|
|Flash point,°F. Pensky-Martens closed cup||No flash point|
|Freeze/thaw stability Passes||5 Cycles|
|Type of VOC||NMP|
|Shelf life||1 year|
Kamthane K-1492 will produces films with exceptional toughness, flexibility and abrasion resistance. Clear coatings based on Kamthane K-1492 compare favorably with high performance conventional solvent-borne urethane lacquers. Typical application and performance properties of clear films from KamthaneK-1492, are described in Tables I and II.
|Dry Time||Sward Hardness Development|
|Set to touch||20 mins.||4 hours||12|
|Dry to touch||35 mins||8 hours||28|
|Through dry||1 hr. 10 min.||24 hours||38|
(After 7 days curing at ambient conditions)
|(mg. loss per 1000 cycles, CS-17 wheel, 1000 gram load)|
|Impact resistance @ 30° F, in-lb.|
|Free film properties|
|100% modulus,||4000 psi|
|Tensile strength,||6500 psi|
*Films cast on untreated cold rolled steel at 1 mil dry.
CHEMICAL, CORROSION AND HUMIDITY RESISTANCES
Clear coatings based on Kamthane K-1492 show excellent chemical and humidity resistance. Corrosion resistance, although adequate for many applications may be improved by the incorporation of air dry crosslinkers such as polyfunctional aziridines. If heat is available, waterreducible hexamethoxylated melamine resins can be used for crosslinking.
The chemical, corrosion and humidity resistances of unmodified Kamthane K-1492 are described in Table III.
Chemical Corrosion and Humidity Resistance
(1.0 mil dry films, on cold rolled steel, air dried 7 days)
|Toluene, 1 hour immersion||No Effect|
|Gasoline, 1 hour immersion||No Effect|
|Methylethylketone, 100 double rubs||No Effect|
|Glacial acetic acid, 1 hour spot test||Slt. Softening, recovers|
|1 N NaOH, 1 hour spot test||No Effect|
|Humidity Resistance (100° F, 100% RH, 700 hours)|
|Rusting (ASTM D610)||No Effect|
|Blistering (ASTM D714)||No Effect|
|Loss in gloss||No Effect|
|Salt Spray Resistance 100 Hours Unscribed (5% NaCl, 95° F)|
|Rusting (ASTM D610)||Trace (9)|
|Blistering (ASTM D714)||Few, #2|
Kamthane K-1492 has outstanding adhesion to a wide variety of substrates. On certain plastics and wood, unmodified Kamthane K-1492 will not wet the substrate. Selected water miscible solvents as well as nonionic and anionic wetting agents can be used to improved the wetting properties.
Additionally, ambient crosslinking with polyfunctional aziridines and selected silanes are recommended for improving adhesion. Table IV describes the adhesion characteristics of Kamthane K-1492 on metal and plastic substrates.
Adhesion Characteristics of Kamthane K-1492 Clear Films
(1.0 mil dry films air dried seven days)
|Untreated Cold Rolled Steel||Excellent||Polycarbonates||Excellent|
|Untreated Aluminum||Excellent||Flexible Vinyl|
* The adhesion of Kamthane K-1492 to various plastics is dependent on the type of plastic and the treatment used on the plastic. For example, on vinyl, the adhesion can vary with the vinyl formulation or the amount of heat used to dry the coating. For most plastic applications, blending the Kamthane K-1492 with various water-borne acrylic resins will substantially improve adhesion.
Normally Kamthane K-1492 exhibits excellent mar resistance. Where additional mar resistance is required, BYK 301, BYK 333 can be used.
The following defoamers are suggested for Kamthane K-1492.
Tego 902 W
BYK 024 and 019
To obtain optimum leveling and substrate wetting with Kamthane K-1492, a surface active agent should be added. The following materials are recommended.
Fluorad FC 120
Dow DC-67 ( 100%) ----------------- 1.3% on solids of resin
BYK-346 (50%) ---------------- 1.6% on solids of resin
Surfynol 104 E ( 50%) --------------- 1.6% on solids of resins
Air dry crosslinkers such as Aziridine, water borne isocyanate hardners, silanes may be incorporated to optimize adhesion, corrosion and chemical resistance. In high bake applications, hexamethoxylated melamine resins, such as Cymel 303 can be used.
CX-100 ---------------- 6-9% by weight on dry resin
Cymel 303 or equivalent ---------------- 10% by weight on dry resin
Waterborne isocyanate hardner ---------------- 10 % by weight on dry resin
There are two means of increasing the viscosity of formulations containing Kamthane K-1492. The first is to employ external thickeners. The second method is to add swelling solvents. Care should be taken in the addition of these solvents. Recommended procedures include good agitation, slow addition and where possible, predilution with water.
|Acrysol ASE-60||Strong Thickening|
|Modicol VD||Strong Thickening|
|Thickener LN||Moderate Thickening|
|PU thickner SCT-275||Moderate Thickening|
|Ethylene Glycol Monobutyl Ether||Strong Swelling|
For dispersing pigments in Kamthane K-1492 the following surfactants are recommended.
|Triton CF-10 (100%)||1.0% solids on pigment|
|Tamol 165 (21.5%)||1.5% solids on pigment|
|Nopcosant K (34%)||1.5% solids on pigment|
|BYK 190 (50)||1.5% solids on pigment|
Kamthane K-1492 can be formulated into gloss and semi-gloss coatings. When preparing dispersions using high-speed equipment, special care must be taken to prevent gelation by avoiding heat build-up in the grind.