Product Data Sheet. Haloflex 202. Haloflex 202 is a vinyl/acrylic emulsion designed for maintenance primers, automotive underbody/under-hood

Transcription

1 is a vinyl/acrylic emulsion designed for maintenance primers, automotive underbody/under-hood coatings, rust converting products, overprint varnishes, and for other coatings applications requiring excellent barrier properties. Coatings based on have good adhesion to a wide range of substrates, excellent durability, toughness and corrosion resistance properties. Delivery form: 60 % solids in water. Product characteristics Type - Vinyl acrylic/vinyledene chloride/acrylic terpolymer Total solids by volume - 49 % Weight per gallon 25 C lbs. as supplied Specific gravity of solids at 25 C 1.58 Chlorine content - 64 % (on latex solids) Freeze/thaw stability - Keep from freezing VOC - None Film properties/key benefits - Superior Corrosion Resistance - Extremely Low Moisture/Vapor Permeability - Zero V.O.C. Potential - Flame Retardant Properties Application - Suggested Markets: - Automotive Coating - General Metal & Industrial Maintenance Coating Product specifications Property Range Unit GAP Appearance Milky white liquid 0059 Total solids w/w % 0001 ph Visc. Brookfield 25 C mpa.s 0020 Other product data Property Value Unit GAP MFFT 12 C 0011 Density 20 C Kg/l 0006 Tg ± 7 C 1140 Preservative(s): BIT (casno ) % 0222 Test methods Test methods (GAP) referred to in the table(s) are available on request. Storage guidelines The resin should be stored indoors in original, unopened, undamaged container in a dry place at storage temperature between 5-30 C. Exposure to direct sunlight should be avoided. Shelf life Under above mentioned storage conditions, the shelf life of the resin will be 12 months ex work. Page 1 of 6 Material safety A Material Safety Data Sheet for this product is available on request.

2 FORMULATION OF HALOFLEX Stabilization The unstabilized Haloflex HA-202, contains very low levels of surfactant from the polymerization process. Therefore, the addition of a surfactant stabilizer is required during formulation. This surfactant stabilizer is typically added during the pigment dispersion stage of paint manufacture. It can aide in pigment wetting and then serve to stabilize the Haloflex latex during proper let-down. Many different types of stabilizers have been evaluated, and the non-ionic copolymers based on ethylene oxide/propylene oxide have been found to be most effective. In addition to being very effective stabilizers, these surfactants also help film coalescence. The levels used are critical, as excess will reduce the cohesive strength of the film, induce surface tack, possibly impair adhesion, and affect water resistance. Haloflex based paints can also be formulated by using nonylphenol 30 mole ethylene oxide condensates both as latex stabilizer and as stabilizer for the pigment dispersion in place of the block copolymer surfactant. The post addition of the nonylphenol condensates may be unsuitable for certain metal primer applications. The appropriate levels of surfactant stabilizer for given situations is as follows: - Paints with a final ph of 1-2 (primarily clear formulations) Five (5) percent active surfactant on Haloflex latex solids. - Paints with a final ph of 4-7, with NO titanium dioxide. Three (3) percent active surfactant on Haloflex latex solids percent active surfactant on total pigment and extenders. - Paints with a final ph of 4-7, containing titanium dioxide. Three (3) percent active surfactant on Haloflex latex solids percent active surfactant on total pigment and extenders. NOTE: The important exception to this generalization is that when Haloflex is used for rust conversion formulations containing tannic acid, the type of surfactant and level of addition differs. Page 2 of 6

3 Pigment Dispersion Dispersion of pigments is a very critical step in the successful preparation of a coating. The dispersant can be one of the most important ingredients in a water borne formulation. Candidate dispersants must function in an acid media. Dispersants which satisfy this criteria would be of an anionic or non-ionic chemical type. The level of dispersant is also critical for performance and is dictated by the particle size of the pigment. As particle size decreases, dispersant demand increases. BYK 155 is the dispersant of choice. It is recommended at 0.5 percent active dispersant on total pigment. The use of a wetting agent in conjunction with the dispersant is also recommended. Surfynol 104 is suitable. Other recommended dispersants include: BYK 181 Tamol 850 Coalescing Solvents Coalescing solvents reduce the minimum film formation temperature of the polymer enabling the paints to be used over a wider range of temperatures. Selection of the appropriate coalescent solvent is important to paint rheology, speed of dry and early performance. Some recommended coalescents: Ethylene Glycol Monobutyl Ether Texanol Diethylene Glycol Monobutyl Ether Diethylene Glycol Monomethyl Ether Propylene Glycol Monomethyl Ether Dipropylene Glycol Monomethyl Ether Suggested Starting Point Formulas WB-6035 WB-6034 WB-6032 WB-6037 WB-6038 WB-6036 Formulating Haloflex for Improved Thermal Stability General Purpose Metal Primer for Spray Application Rust Corrosion Coating Based on Tannic Acid Water Based Primer for Rail Cars Primer for Blasted Steel Black Dip Primer for Steel Page 3 of 6

4 Thickening Agents The choice of thickening agent depends largely on the end use and method of application of the paint. The properties of the more important groups are discussed below: Type Property Product Polyurethane Noted for their excellent flow and leveling; typically requires ph 4 or greater. May require up to 1% active on paint solids to prevent settlement and eliminate sagging at high dry film thickness. Choice of coalescing solvent and pigment stabilizer is critical. Borchigel L75 Rohm & Haas RM-8 UCAR SCT-270 Cellulosic Very efficient at preventing pigment settlement and Methocel J12MS enabling thick films to be spray applied without Natrosol 250-HBR sagging. Because they recover their structure rapidly after application, paint flow properties are adversely effected, even at levels as low as 0.1% active on paint solids. They can be used in combination with polyurethane thickeners. Silica Type These include precipitated and fumed silicas. They Aerosil 300 offer advantages in dipping paints in preventing paint slippage, particularly when force drying is employed. Xanthan Gum Efficient acid stable thickeners. Used in rust converter formulations in combination with silica thickener. Gives inferior results to the cellulosic thickeners in primers, but can perform well in topcoats. Kelzan S Clay Based Gives similar rheology to the cellulosic thickeners. Bentone LT Gives some problems with long-term storage stability. Not recommended. Polyacrylate Thickeners such as a methyl vinyl ether maleic anhydride copolymer, and inverse polyacrylamides, (eg. Texipol ), have been evaluated in Haloflex lacquers and adhesives. They do not give as much structure as the cellulosic thickeners, but can be used with unstabilized Haloflex latex. Page 4 of 6

5 Paint Manufacture Typical latex paint manufacturing procedures are suitable. There are, however, a few critical procedures which must be followed to ensure optimum performance and stability of the final paint. Haloflex latexes are not shear stable. Dispersing of pigments in the resin is NOT recommended. - Order of Addition The Haloflex latex MUST always be added TO the millbase (pigment dispersion), under low agitation, to ensure proper stabilization of the resin as well as the paint. - Surfactant Stabilizer Solubilization It is recommended that surfactant stabilizers be solubilized in water before addition to the millbase (grind). Ensure the solution is clear, water-white, and seed free before proceeding with pigment dispersion. Failure to fully solubilize the surfactant stabilizer can adversely affect performance properties and paint stability. - ph Issues In many formulations, pre-adjustment of the Haloflex latex to ph , is recommended. This will prevent shock when the latex is added to the basic millbase (grind). Haloflex latex ph adjustment, if needed, is done with ammonia. Diluted tertiary amines, such as DMAMP-80 can be used when ammonia is unacceptable. NEVER adjust the ph of a Haloflex-based finished paint. - Miscellaneous Millbase temperature must be below 110 F before adding the Haloflex latex to the millbase during let-down. It is suggested that minimum levels of cellulosic thickeners be added to the millbase. This will help maintain temperatures below 110 F and reduce the possibility of degradation. The recommended minimum dry film thickness is 2.0 mils for the ultimate in corrosion performance. Page 5 of 6

6 Raw Material Suppliers Material Supplier Texanol Eastman Chemical (800) EASTMAN Methocel J12MS Dow Chemical Company (800) BYK 181 BYK Chemie, USA BYK 155 (203) Tamol 850 Rohm & Haas Company RM-8 (215) UCAR SCT-270 Natrosol 250-HBR Aerosil 300 Kelzan S Bentone LT Foamaster S Texipol DMAMP-80 Union Carbide Corporation (800) Hercules Incorporated (302) DeGussa Corporation (800) Kelco (800) Rheox Incorporated (800) Henkel Corporation (800) E.M. Sullivan Associates (610) Angus Chemical Company (847) Page 6 of 6