Document NEYxv6r41yxo2BXXkmorVB2w

DownloadSearchable PDFRandom document
ROHM RWD HPRS COMPRPJY INDEPENDENCE MALL WEST PHILADELPHIA. PENNSYLVANIA 19105 STAIN RESISTANT PRIMERS FOR WOOD BASED ON RHOPLEX AC-388 ACRYLIC EMULSION FORMULATIONS PR-88-4, PR-88-4A, PR-88-5 PR-88-5A, PR-88-6, PR-88-6A INTRODUCTION Stain resistant wood primer formulations containing basic lead silicate or dibasic lead phosphite are now available based on Rhoplex AC-388. The method used to control the leaching of watersoluble stains from wood was developed originally with Rhoplex AC-34 acrylic emulsion and basic lead silicate in the primer pigmentation. In such systems, the lead-containing pigment apparently reacts with organic colorants leached from the wood to form insoluble substances. In laboratory tests, dibasic lead phosphite appears to be more efficient than basic lead silicate in holding out stains. Primers containing diabasic lead phosphite are whiter than basic lead silicate-containing primers, which discolor. The dis coloration is not generally transmitted to the emulsion topcoat paint applied over it. In some cases, however, basic lead silicate may require the use of two coats, whereas this has nor been necessary in tests with dibasic lead phosphite primers. These stain resistant primer formulations can be used on practically any type of bare wood with good results, including cedar, redwood, cypress, yellow pine, white pine, fir and plywood. NOTES ON FORMULATIONS There are two grades of basic lead silicate commonly used in stain resistant primers of this type: EP-202 made by the Eagie-Picher Industries, Inc. and Oncor 45X (Green Seal) made by the National Lead Company. It should be noted that the bulking values of these two grades are quite dif ferent. Therefore, it is necessary to use different levels of calcium carbonate to maintain a 30 percent PVC paint. Dyphos PG made by the National Lead Company is the grade of dibasic lead phosphite used in formulations PR-88-4 and PR-88-4A. It is used at a level of 75 pounds. At this time, we have no stability or exterior durability data on these two recently developed formulations. Alkyd modified formulations are presented for each type of lead pigment. The long oil alkyd replaces 12 percent of Rhoplex AC-388 on a volume solids basis. We have found no significant differences in properties between modified and unmodified primers, if alkyd modification is kept at, or below, 12 percent. C-253 Revised April 1968 TABLE 1 - STAIN RESISTANT PRIMERS FOR WOOD MADE WITH RHOPLEX AC-388 AND DYPHOS PG Formulation PR-88-4 Formulation PR-88-4A Materials Pounds Gallons Pounds Gallons Water Ethylene glycol Hydroxyethyi cellulose (2.5% solution) Tamol 850 (30%) Preservative (57% mercury) Antifoamer Dibasic lead phosphite: Dyphos PG Non-chalking rutile titanium dioxide Calcium carbonate Grind the above materials in a high-speed mill (Cowles, 3800 to 4500 feet per minute for 10 to 15 minutes) and let down, at a slower speed, as follows: Rhoplex AC-388 (50%) Long oil alkyd* Antifoamer Pine oil Propylene glycol Water and/or hydroxyethyi cellulose (2.5%) Drier treated with 0.5% by weight of 6% cobalt, 0.5% of 6% manganese, and 1.4% of 24% lead, prior to incorporation of alkyd. Physical Constants Pigment volume content Solids: Volume Weight Approximate pH Approximate viscosity: (Krebs Units) Initial Equilibrated Approximate raw material cost 60.3 30.0 80.0 8.5 1.8 i.O 75.0 150.0 125.1 7.24 3.22 9.75 0.85 0.11 0.13 1.50 4.56 5.68 60.3 30.0 80.0 8.5 1.8 1.0 75.0 150.0 125.1 7.24 3.22 9.75 0.85 0.11 0.13 1.50 4.56 5.68 498.9 -- 1.0 10.0 30.0 48.1 1119.7 56.68 -- 0.13 1.08 3.23 5.84 100.00 439.0 26.7 1.0 5.0 30.0 83.1 1116.5 49.87 3.20 0.13 0.55 3.23 9.98 100.00 30.5% 38.4% 53.5% 9.4 to 9.7 70 to 76 80 to 84 $2.03/gallon 30.5% 38.4% 53.5% 9.4 to 9.7 70 to 76 80 to 84 $2.02/gallon 2- - GLD005648 TABLE 2 - STAIN RESISTANT PRIMERS FOR WOOD MADE WITH RHOPLEX AC-388 AND ONCOR 45X Formulation PR-88-5 Formulation PR-88-5A Materials Pounds Gallons Pounds Gallons Water Tamol 850 (30%) Potassium tripolyphosphate Antifoamer Ethylene glycol Preservative (57% mercury) Hydroxyethyl cellulose (2.5% solution) Basic lead silicate National Lead, Oncor 45X Non-chalking rutile titanium dioxide Silica Grind the above materials in a high-speed mill (Cowles, 3800 to 4500 feet per minute for 10 to 15 minutes) and let down, at a slower speed, as follows: 40.0 6.5 1.5 1.0 35.0 1.8 80.0 125.0 150.0 69.4 4.80 0.65 0.07 0.13 3-76 0.11 9.75 3.75 4.56 3-15 40.0 6.5 1.5 1.0 35.0 1.8 80.0 125.0 150.0 69.4 4.80 0.65 0.07 0.13 3.76 0.11 9.75 3.75 4.56 3.15 Rhoplex AC-388 (50%) Long oil alkyd* Antifoamer Tributyl phosphate Water and/or hydroxyethyl cellulose (2.5%) Drier treated with 0.5% by weight of 6% cobalt, 0.5% of 6% manganese, and 1.4% of 24% lead, prior to incorporation of alkyd. 498.9 1.0 12.4 80.4 1102.9 56.68 - 0.13 1.53 10.93 100.00 438.6 26.7 1.0 10.9 112.3 1099.7 49.80 3.20 0.13 1.34 14.80 100.00 Physicol Constants Pigment volume content Solids: Volume Weight Approximate pH Approximate viscosity: (Krebs Units) Initial Equilibrated Approximate raw material cost 30.0% 38.1% 53.3% 9.4 to 9.7 74 to 78 80 to 84 81.78/gallon 30.0% 38.1% 53.2% 9.4 to 9.7 74 to 78 80 to 84 81.77/gallon 3- - GLD 0056^*5 TABLE 3 - STAIN RESISTANT PRIMERS FOR WOOD MADE WITH RHOPLEX AC-388 AND EAGLE-PICHER 202 Formulation PR-88-6 Formulation PR-88-6A Materials Pounds Gallons Pounds Gallons Water Tamol 850 (30%) Antifoamer Ethylene glycol Preservative (57% mercury) Hydroxyethyl cellulose (2.5% solution)' Basic lead silicate: Eagle-Picher, EP-202 Non-chalking rutile titanium dioxide Silica Grind the above materials in a high-speed mill (Cowles, 3800 to 4500 feet per minute for 10 to 15 minutes) end let down, at a slower speed, as follows: 40.0 5.0 1.0 35.0 1.8 80.0 125.0 150.0 100.9 4.80 0.50 0.13 3.76 0.11 9.75 2.32 4.56 4.58 40.0 5.0 1.0 35.0 1.8 80.0 i25-0 150.0 100.9 4.80 0.50 0.13 376 0.11 975 2.32 4.56 4.58 Rhoplex AC-388 (50%) Long oil alkyd* Antifoamer Tributyl phosphate Water and/or hydroxyethyl cellulose (2.5%) * Drier created with 0.5% by weight of 6% cobalt, 0.5% of 6% manganese, and 1.4% of 24% lead, prior to incorporation of alkyd. 498.9 -- 1.0 12.4 88.8 1143-8 56.68 - 0.13 1.53 10.75 100.00 438.6 267 1.0 10.9 120.7 1140.6 49-80 3-20 0.13 1.34 14.62 100.00 Physical Constants Pigment volume content Solids: Volume Weight Approximate pH Approximate viscosity: (Krebs Units) Initial Equilibrated Approximate raw material cost 30.0% 38.1% 54.6% 9.4 to 97-. 74 to 78 80 to 84 $1.85/gallon 30.0% 38.1% 54.4% 9.4 to 97 74 to 78 80 to 84 $1.84/gaIlon c RHOPLEX and TAMOL are trademarks Reg. U.S. Pat. Off. and in principal foreign countries. In certain foreign countries RHOPLEX products are sold under the trademark PRIMAL; TAMOL products under the trademark OROTAN. These suggestions and data are based on information we believe to be reliable. They ere offered in good faith, but without guarantee, as conditions and methods of use of our products are beyond our control. We recommend that the prospective user determine the suability ot our materials end sug gestions before adopting them on a commercial scale. Suggestions tor uses of our products Should not be understood as recommendations that they be used in violation of eny patents. GU0005650 Priftfvd in U.S.A.