RHOPLEX TP-257 Polymer Emulsion for Waterborne Traffic Marking Paints

Transcription

1 Technical Data Sheet RHOPLEX TP-257 Polymer Emulsion for Waterborne Traffic Marking Paints Regional Product Availability Description Advantages of Paints Based on RHOPLEX TP-257 North America RHOPLEX TP-257 polymer emulsion is a high-solids binder for waterborne acrylic traffic paints, which offers a good cost/performance balance. Quick-drying striping paints formulated with RHOPLEX TP-257 resist the rigorous environment encountered on highways and related surfaces such as airfields and parking lots. Paints formulated with RHOPLEX TP-257: offer a balance of low cost and quality performance possess the environmental advantages of a waterborne system retain glass beads longer hold up longer between repainting as indicated by road tests allow the work area to be back in service sooner due to their quick drying properties Typical Physical Properties These properties are typical but do not constitute specifications. Solids content, % 60.5 Viscosity, #3 spindle, 60 rpm, 250C, cps 850 ph 8.9 Bulking value, gal/lb Wet Dry Performance of Paints Based on RHOPLEX TP-257 Striping paints fall into two general categories: highway and airport marking. The majority of these paints, sold to states, counties, and municipalities for road marking, require fast drying characteristics and early water resistance. Also important is good wear resistance including retention of the reflective glass beads. RHOPLEX TP-257, a relatively hydrophobic acrylic binder, possesses all of these characteristics. The specific balance of properties in a traffic striping paint varies from one locality to another. The variations include cost, speed of dry, and adhesion characteristics. Formulation XTP-57-4M has been demonstrated in commercial use and thus is an excellent starting point for evaluating waterborne traffic paint. Variants of this formulation demonstrating different balance of properties are presented here. The following table contains a summary comparison of these properties. A fast drying waterborne yellow traffic paint formulation, XTP-57-10M, containing a non-chromate pigment, is also included in this bulletin. Techniques used to change the balance of properties with the white formulation, XTP-57-4M, could also be effective here. Page 1 of 8 RHOPLEX TP-257 Polymer Emulsion / Dow Coating Materials January 2010

2 Comparison of Properties of Various Formulations Formulating Paints Based on RHOPLEX TP-257 Formulation # XTP-57-4M XTP-57-5M XTP-57-6M XTP Variant Commercial Lower Cost Higher Binder Faster Dry Formula Technique Opaque Polymer Reduced PVC Approximate Performance Characteristics cycles Pick up time, min Higher Volume Solids Dry-through time, min Formulation cost Base Slightly less Much higher Slightly higher PVC, % Volume Solids, % Initial days at 1200 F cycles, freeze/thaw No unusual techniques are required with RHOPLEX TP-257, but in formulating for short dry times, an important factor is volume solids where a value of 60% or greater is desirable. Any organic solvents used should be as volatile as possible. Therefore, methanol is suggested as the freeze-thaw agent. The use of all Butyl Carbitol as coalescent has the advantage of fast evaporation and minor effect on paint viscosity. However, it has been found in practical applications on highways that a paint containing only Butyl Carbitol is susceptible to poor film formation if exposed to water (rain) before it is thoroughly dried. The coalescent system in the suggested formulas in this technical data sheet has been changed from our previous recommendations to a 1:1 blend of Butyl Carbitol and Texanol in order to provide a safety factor against this problem. This can result in somewhat greater viscosity changes of the paint; these changes should not affect the ability to apply the paint satisfactorily in actual use. Also, the cycles in the scrub test may be lowered. This reflects the presence of the lower volatility Texanol. Upon longer drying, the scrub resistance improves to or near that seen with 100% Butyl Carbitol coalescent. High solids paint formulations such as those suggested in these notes may require special precautions in order to avoid non-dissolvable contamination generated by surface skinning. Avoid or minimize this situation by preventing the liquid surface from drying in the storage container. Fill the drums as completely as possible, store at reasonably constant temperature, use polyethylene drum and lid liners, and seal tightly to prevent contact with the air. A thin layer of water floated on the paint surface may also prove beneficial. Drying is retarded considerably by high humidity and poor air flow, and these conditions should be controlled during laboratory evaluations. Normally a temperature of 750 F, a relative humidity of 50%, and a strong air flow are sufficient. In practice, marking paints are sprayed at F and the atomization and temperature increase the rate of evaporation. Although the formulations in these notes do not contain a can preservative, paint manufacturers should incorporate a preservative of their choice. Page 2 of 8 RHOPLEX TP-257 Polymer Emulsion / Dow Coating Materials January 2010

3 Formulation XTP-57-4M Commercial Formula This formulation is being used successfully in commercially available traffic paints which meet the specifications of many highway jurisdictions. Materials Pounds Gallons RHOPLEX TP-257 (60.5%) Water TAMOL 850 (30%) TRITON CF Drew L Ti-Pure R Silver Bond B Snowflake Mix the above until all the pigment is incorporated, then add: Methanol Butyl Carbitol Texanol Drew L Natrosol 250 MR (2.5%) Initial days at 1200 F 89 5 cycles freeze/thaw 90 PVC, % 60 Volume Solids, % 60.7 Pigment by weight, % 60.8 Non-Volatiles by weight, % 76.9 Non-Volatiles vehicle by weight, % 41.2 Dry Times Wet Mils applied at 720 F and 57% R.H., Air Flow 75 FPM Dry-Through, Minutes 20 Dry-to-No-Pick-up, Minutes Dry Mils dried for 24 hours before testing Cycles to Failure Page 3 of 8 RHOPLEX TP-257 Polymer Emulsion / Dow Coating Materials January 2010

4 Formulation XTP-57-6M Higher Binder Formula Materials Pounds Gallons RHOPLEX TP-257 (60.5%) Water TAMOL 850 (30%) TRITON CF Drew L Ti-Pure R Snowflake Mix the above until all the pigment is incorporated, then add: Methanol Butyl Carbitol Texanol Drew L Initial days at 1200 F cycles freeze/thaw 106 PVC, % 50 Volume Solids, % 62 Pigment by weight, % 54.9 Non-Volatiles by weight, % 76.6 Non-Volatiles vehicle by weight, % 48.1 Dry Times Wet Mils applied at 720 F and 57% R.H., Air Flow 75 FPM Dry-Through, Minutes 17 Dry-to-No-Pick-up, Minutes Dry Mils dried for 24 hours before testing Cycles to Failure Page 4 of 8 RHOPLEX TP-257 Polymer Emulsion / Dow Coating Materials January 2010

5 Formulation XTP Fast Dry Formula Increasing the solids by volume of a traffic paint means there is less water to evaporate. This results in faster drying compared with other formulas. Materials Pounds Gallons RHOPLEX TP-257 (60.5%) Water TAMOL 850 (30%) TRITON CF Drew L Ti-Pure R Silver Bond B Snowflake Mix the above until all the pigment is incorporated, then add: Methanol Butyl Carbitol Texanol Drew L Initial 90 7 days at 1200 F cycles freeze/thaw 95 PVC, % 61.6 Volume Solids, % 63.5 Pigment by weight, % 63.5 Non-Volatiles by weight, % 79.4 Non-Volatiles vehicle by weight, % 43.4 Dry Times Wet Mils applied at 720 F and 57% R.H., Air Flow 75 FPM Dry-Through, Minutes 15 Dry-to-No-Pick-up, Minutes Dry Mils dried for 24 hours before testing Cycles to Failure Page 5 of 8 RHOPLEX TP-257 Polymer Emulsion / Dow Coating Materials January 2010

6 Formulation XTP-57-10M Yellow Formula The following starting point formulation containing a non-chromate yellow pigment is a fast drying waterborne yellow traffic paint for highway marking. Techniques used to change the balance of properties with the white formulation, XTP-57-4M could also be effective here. Materials Pounds Gallons RHOPLEX TP-257 (60.5%) Water TAMOL 850 (30%) TRITON CF Drew L Ti-Pure R Silver Bond B Snowflake Hansa yellow X Mix the above until all the pigment is incorporated, then add: Methanol Butyl Carbitol Texanol Drew L Natrosol 250 MR (2.5%) Initial 73 7 days at 1200 F 83 5 cycles freeze/thaw 86 PVC, % 60 Volume Solids, % 60.7 Pigment by weight, % 59.4 Non-Volatiles by weight, % 76.1 Non-Volatiles vehicle by weight, % 41.2 Dry Times Wet Mils applied at 720 F and 57% R.H., Air Flow 75 FPM Dry-Through, Minutes 20 Dry-to-No-Pick-up, Minutes Dry Mils dried for 24 hours before testing Cycles to Failure 1200 Page 6 of 8 RHOPLEX TP-257 Polymer Emulsion / Dow Coating Materials January 2010

7 Suppliers of Suggested Raw Materials Trade Name Type Supplier Butyl Carbitol Diethylene glycol monobutyl ether Coalescent Union Carbide Corporation Old Ridgebury Road Danbury, CT Drew L-493 Defoamer Drew Chemical Company One Drew Plaza Boonton, NJ Hansa Yellow X Powder Pigment Hoechst Celanese Industrial Chemical Division 500 Washington Street Coventry, RI Natrosol 250 MR Thickeners Ashland Aqualon Functional Ingredients Hercules Plaza 1313 N. Market Street Wilmington, DE Silver Bond B Extender pigment Tamsco, Inc. P.O. Box J Tamms, IL Snowflake Extender pigment Thompson, Weinman & Co. P.O. Box 130 Cartersville, GA TAMOL 850 Dispersant Dow Chemical USA Midland, MI Texanol Coalescent Eastman Chemical Products P.O. Box 431 Kingsport, TN Ti-Pure R-900 Titanium Dioxide E. I. DuPont 1007 Market Street Wilmington, DE Triton CF-10 Surfactant Dow Chemical USA Midland, MI Page 7 of 8 RHOPLEX TP-257 Polymer Emulsion / Dow Coating Materials January 2010

8 Handling Precautions Before using this product, consult the Material Safety Data Sheet (MSDS)/Safety Data Sheet (SDS) for details on product hazards, recommended handling precautions and product storage. CAUTION! Keep combustible and/or flammable products and their vapors away from heat, sparks, flames and other sources of ignition including static discharge. Processing or operating at temperatures near or above product flashpoint may pose a fire hazard. Use appropriate grounding and bonding techniques to manage static discharge hazards. CAUTION! Failure to maintain proper volume level when using immersion heaters can expose tank and solution to excessive heat resulting in a possible combustion hazard, particularly when plastic tanks are used. Storage Disposal Considerations Store products in tightly closed original containers at temperatures recommended on the product label. Dispose in accordance with all local, state (provincial) and federal regulations. Empty containers may contain hazardous residues. This material and its container must be disposed in a safe and legal manner. It is the user's responsibility to verify that treatment and disposal procedures comply with local, state (provincial) and federal regulations. Contact The Dow Chemical Company for more information. Contact: North America: Latin America: Europe: Asia-Pacific: For Industrial Use Only. This information is based on our experience and is, to the best of our knowledge, true and accurate. However, since conditions for use and handling of products are beyond our control, we make no guarantee or warranty, expressed or implied, regarding the information, the use, handling, storage or possession of the products, or the applications of any process described herein or the results sought to be obtained. Nothing herein shall be construed as a recommendation to use any product in violation of any patent rights. Page 8 of 8 RHOPLEX TP-257 Polymer Emulsion / Dow Coating Materials January 2010