Document RjbqGjQjM8eQNVgLBLVQpgvj7

CSL-177A Supplement No. Report from the COATINGS SERVICE LABORATORY HIGH-BUILD PARLON MAINTENANCE PAINTS A Guide To Analysis Of 12-Months-Exposure Photographs The exposure series at two locations in Miami, Florida, as out lined in Hercules CSL-177A, has now passed the 12-month mark. While many of the coatings are still relatively unaffected, a sufficient number of failures have occurred to make a progress report meaningful at this time. Results Available for Study After 12 months' exposure, most of the systems based on Parlon chlorinated rubber are performing remarkably well at both locations. Com plete results, in the form of color photographs of the actual panels after 12 months' exposure, taken on location, are available for examination from any Hercules Polymers Department Sales Office. Coating Systems on Exposure Many years of experience in this field have shown that the out standing systems chosen on the basis of laboratory data, may not neces sarily prove to be the most effective systems in the field. As a result, 18 separate systems made up from three primers, two midcoats, and three topcoats which showed the most promising performance in laboratory test ing were exposed at both Florida locations. The formulations for these coatings, based on the principles demonstrated in CSL-177A, are detailed in Table I, page 3. Ten panels finished with commercial systems repre senting the other generic types of successful maintenance coatings were also exposed as controls. A complete breakdown of the 28 systems used is given in Table II, page 4. DSW 313028 Because we cannot anticipate or control the many different conditions under which this information and our products may be used, we do not guarantee the applicability or the accuracy of this information or the suitability of our products in any given situation. Users of our products should make their own tests to determine the suitability of each such product for their particular purposes. The products discussed are sold without such warranty, either express or implied. Also, statements concerning the possible use of our products are not intended as recommendations to use our products in the infringement of any patent. POLYMERS DEPARTMENT HERCULES POWDER COMPANY WILMINGTON, DELAWARE INCORPORATED STLCOPCB4054446 HERCULES CSL-177A, Supp. No. 1 Page 2 of 4 Panel Preparation All of the coatings were applied to both Kenneth Tator panels and to prerusted channel iron. Surface preparation of the Kenneth Tator pan els consisted simply of a solvent wash, while the prerusted channel-iron panels were lightly wire-brushed before coating. The Parlon systems were applied in three coats -- a 1. 5 to 2-mil prime coat, a 2. 5 to 3. 5-mil mid coat, and a 1 to 1. 5-mil topcoat - yielding a total dry-film thickness of 5 to 7 mils. The other generic types of coatings were applied according to the specific instructions of each manufacturer, but in no case was there less than a 5-mil total build. To insure complete coverage of the maintenance painting field, the relative performances of the various coatings applied to sandblasted sub strates is also being measured. Since sandblasting prior to coating markedly increases the service life of most coatings, a considerably longer exposure period will be required to obtain' significant results. Exposure Environments The moving-tide location is so located that each tide-cycle covers ( the panels. Each panel is thus immersed in sea water for approximately 50 percent of the total exposure time, and during low-tide periods is sub jected to the combined sun-and-humidity exposures typical of south Florida. The panels at the Marine Atmosphere Station are located on the roof of a three-story building approximately 100 feet from the shore. Here the sun light and high-humidity conditions are similar to those at the moving-tide location but the specimens are not, except in severe storm periods, ex posed to direct contact with sea spray or wind-driven salt particles. Further Work in Progress A well-known firm of independent coatings consultants is reading and grading the panels at both Florida locations on a continuing basis. When failure sufficient to enable them to rate each system's performance has occurred, they will prepare a complete analysis of the results. When this analysis is finalized, a further supplemental report will be issued. DSW 313029 STLCOPCB4054447 m HERCULES CSL-177A, Supp. No. 1 Page 3 of 4 Table I FORMULATION OF EXPERIMENTAL COATINGS^ Primers______ AB C Parlon S-10 --- Parlon S-20 20,0 12. 3 15. 8 Aroclor 1254 10. 0 6.7 8. 3 Aroclor 5460 5.0 3. 3 - Rezyl 869 -. - 8. 3 Chlorowax 70 --- Clorafin 40 --- Dioctyl sebacate '- - - Buton 200 --- Uformite F-240 --- Hycar 1312 --- Red lead (97%) - 22. 3 17. 1 Zinc yellow 8. 8 3.7 3. 1 Aratone 270 (mica) 9.4 3. 7 2. 7 Indian red - 0. 6 0. 8 Fibrene C-400 (talc) - 8. 4 5.9 Bentone 34 --- Bentone 38 - 1. 5 1. 5 Asbestine 3X 8. 8 - - Ti02, R610 3. 5 - - Lampblack --- Zinc oxide 4. 5 - - Xylene 30. 0 30.0 30. 0 Toluene --- Isopropyl alcohol - - - Solvesso 150 - - - VM&P naphtha - 7. 5 6. 5 Butanol --- 100.0 100.0 100. 0 MidcoatsTopcoats D E FGH - - 23. 2 12. 4 23.9 20. 1 15. 3 - - - 10. 0 - 9. 2 - - 5.0 - 5. 6 - - ----- - 7. 5 - - - - 4. 6 - - - - - 2. 3 - - - - - 12. 3 - - - - 6. 1 - - - - - 12. 8 ----- - -- - - - 6.4 8. 1 - - - ----- ----- - - - -. - 0.7 1.0 - - - 15. 6 20. 1 - - - 4.0 5. 1 26. 8 24. 9 29. 8 0.4 0. 5 0. 3 0. 3 0. 3 - - -- - - - 32. 6 29.4 33. 2 37. 8 37. 8 - - - - - - 3. 0 - - - - 9. 2 - ----- - - - 2.4 - 100. 0 100. 0 100. 0 100. 0 100. 0 Stabilizer A-5 Epichlorohydrin --------------------------------3% based on Parlon----------------------------------------------------------- "0. 5% based on Parlon---------------------------- PVC 33.1 38. 2 22.6 30.0 40.0 20.0 20.0 20.0 (1) "A" is a Parlon all-chlorinated (Category I) primer with zinc chromate pigmentation. "B" is a Parlon all-chlorinated (Category I) primer with red lead and zinc chromate pigmentation. "C" is a Parlon-alkyd (Category II) primer with red lead and zinc chromate pigmentation. "D" is a Parlon allchlorinated mastic midcoat. "E" is a Parlon all-chlorinated mastic midcoat. "F" is a Parlon all-chlorinated topcoat. "G" is a Parlon-Buton-Uformite topcoat. "H" is a Parlon-Hycar 1312 topcoat. DSVM 313030 STLCOPCB4054448 -J HERCULES CSL-177A, Supp. No. 1 Page 4 of 4 Table II DESIGNATION OF MAINTENANCE SYSTEMS Panel Designation Experimental Systems Primer Midcoat Topcoat 38-1 38-2 38-3 38-4 38-5 38-6 38-7 38-8 38-9 38-10 38-11 38-12 38-13 38-14 38-!5 38-16 38-17 38-18 A B _ c_ D- _ E- D E D _ E- F G H F G H F G H F G H F G H F G H Panel Designation Commercial Systems Primer Topcoat I Topcoat II 39-1 39-2 39-3 39-4 39-5 39-6 39-7 39-8 39-9 39-10 alkyd vinyl epoxy ester catalyzed epoxy acrylate copolymer chlorinated rubber- phenolic chlorinated rubber chlorinated rubber chlorinated rubber polyurethane alkyd enamel vinyl epoxy ester catalyzed epoxy acrylate copolymer phenolic neoprene chlorinated rubber chlorosulfonated polyethylene polyurethane alkyd enamel vinyl epoxy ester catalyzed epoxy acrylate copolymer phenolic neoprene chlorinated rubber chlo r o sulfonate d polyethylene polyurethane Preparation: All systems were spray-applied if sufficient film thickness was obtainable in 1 coat. Special cases were: (1) the vinyl primer on panel 39-2 and the commercial chlorinated rubber primer on panel 39-8, both of which required 2 spray coats for proper film thickness of 1. 5 mils, and (2) the acry late copolymer and neoprene topcoats (land II) which required brushing to obtain a sufficient film thickness. A total of at least 5 dry mils was applied in all cases. DSW 313031 STLCOPCB4054449