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Acrylic Polymer Emulsions for Waterproofing, Construction Chemicals, Paint Emulsions, Bopp Tape Adhesives, Waterbased Printing Inks

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KAMTHANE K-1492

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.

Typical Properties
Type anionic,aliphatic dispersion
Appearance Translucent clear.
Total solids (% w/w) 34% ±1
pH (25°C) 7.0-8.5
Viscosity 60- 250 cps
Volatile 8.0% NMP
Elongation at break 200%
Density of dispersion (kg/l) 1.05
Konig hardness 160
Freeze/thaw stability stable
Film Properties

High clarity, Hard and flexible
Excellent water and alkali resistant
Excellent abrasion, chemical & impact resistance.
Good alcohol resistance
Adhesion to many substrates.

Recommendation For End-use

Concrete & rigid substrate coatings
Industrial waterproofing coatings
Multi-surface & paint coatings
Metal, plastic & wood coatings
Parquet floorings

General Guidelines

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.

Coverage

Coverage depends upon the nature of the surface to be applied. But an average, smooth surface will give approx. 80 to100 sq.ft per coat.

Technical Information
Kamthane K-1492

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.

Key Benefits
  • Hardness
  • Abrasion Resistance
  • Solvent Resistance
  • Chemical Resistance
  • Water Resistance
  • Impact Resistance
  • Flexibility
  • Compatibility with many Acrylic Emulsions
  • Good Adhesion to Polycarbonate
Film Properties
Typical Properties
Type Aliphatic polyurethane
Appearance Translucent dispersion
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
Mechanical stability Satisfactory
Type of VOC NMP
Shelf life 1 year
Film Properties

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.

Table I
Application Properties of Clear Films*
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
48 hours 40
1 week 44
Table II
Physical Performance Properties of Clear Films* (After 7 days curing at ambient conditions)
Pencil hardness 3H
Taber abrasion 22
(mg. loss per 1000 cycles, CS-17 wheel, 1000 gram load)
 
Impact resistance @ 30° F, in-lb.
Direct 160
Reverse 160
Free film properties
100% modulus, 4000 psi
Tensile strength, 6500 psi
Elongation, 200%

*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.

TABLE III
Chemical Corrosion and Humidity Resistance (1.0 mil dry films, on cold rolled steel, air dried 7 days)
Chemical Resistance
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
Adhesion Characteristics

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.

TABLE IV
Adhesion Characteristics of Kamthane K-1492 Clear Films
(1.0 mil dry films air dried seven days)
Metal Plastics
Untreated Cold Rolled Steel Excellent Polycarbonates Excellent
Bonderite 100 Excellent HDP Selective*
Bonderite 1000 Excellent ABS Selective*
Tin Plate Excellent Nylon Selective*
Untreated Aluminum Excellent Flexible Vinyl  
Anodized Aluminum Excellent    

* 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.

Mar Agents

Normally Kamthane K-1492 exhibits excellent mar resistance. Where additional mar resistance is required, BYK 301, BYK 333 can be used.

Defoamers

The following defoamers are suggested for Kamthane K-1492.
Foammaster
Foammaster NS-1
Drewplus Y-200
Tego 902 W
BYK 024 and 019

Flow and Leveling

To obtain optimum leveling and substrate wetting with Kamthane K-1492, a surface active agent should be added. The following materials are recommended.

Triton GR-7M
DC-14
Fluorad FC 120
VXL 4930

Surface Active Agents

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

Crosslinking

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

Thickening

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.

External Thickeners
Acrysol ASE-60 Strong Thickening
Modicol VD Strong Thickening
Thickener LN Moderate Thickening
PU thickner SCT-275 Moderate Thickening
 
Swelling Solvents  
 
Ethylene Glycol Monobutyl Ether Strong Swelling
n-Butanol Strong Swelling
Methylethylketone Moderate Swelling
Texanol Moderate Swelling
Isopropanol Moderate Swelling
Dispersant

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
Pigmentation

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.

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