Document QkQzzQDJrg1XQp8q4EXEMa0GL

MINING ASD METALS DIVISION nr. J. E. Walsh UCC Mining and Metals 17 Executive Park Drive Atlanta, GA 30329 Messrs. G. L. Dickson B. L. Ingalls J. L. Myers T. P. Morris W. C. Thurber File p. o. nox 5/s. Niagara fails, new ycsx 14332 Data Criginofirg Dapt. Answering dcJe Subject March 26, 1974 "Calidria" Asbestos Use of "Calidria" S&sbeiiss--^ to Partially Replace)Dfcllulosic Thickener in Various \Pamts \ Dear Jack: The available information on the above subject has been assembled in accordance with your request. It isn't riches but there is a reasonable indication that something like 25% of the cellulosic thickener might be re placed by asbestos. Replacement ratio looks like about two pounds asbestos per pound of cellulosic removed. In case anyone wants to try this out it is suggested that the ' asbestos be dispersed first into the water in the formulation by strong shearing in a Cowles. At least a portion of the surfactants in the formu lation should be added at this point. The asbestos should be follevied by the other dry solids. The latex should be added at the end. I would strongly recommend that you move cautiously with this ap plication at a couple of selected locations before any general introduction. Don't turn Andres loose with it all over Florida before some favorable field results have been obtained. Regards , 'i H. B. Rhodes HDR:cam Attachment Kc.Cfc.lVED MAR 2 9 1974 USE OF "CALIDRIA" ASBESTOS TO PARTIALLY REPLACE CELLULOSIC THICKENER IN VARIOUS PAINTS 1. Our experience and experimental work has been mainly directed at using the asbestos to reduce the amount of TiOg needed to obtain a given level of hiding power. Removal of the cellulosic thickener was looked at as a secondary benefit. This is illustrated in Table 1 of "Calidria Products for Latex Paints" where 20 pounds of HPP asbestos is added to the system and 20 pounds TiO2 is removed, the cellulosic thickener is only decreased by one pound., i.e., from five pounds to four pounds. 2. Some viscosity data for various combinations of RG-144 and Cellosize QP-52,000 at loadings of 1,2, and 3% in water are shown in Table I and in Figures 1 and 2 . This is only one set of experiments with one grade of Cellosize and should be used with considerable caution. These data suggest that a moderate replacement of Cellosize up to 25-30% may im prove the viscosity but beyond that the viscosity drops sharply t 90/10 (asbestos/Cellosize), which is not plotted, there may even be a mutual detraction. Note also that the range of thickener loadings used here is 3-15 times as much as typical in paints. 3. The effect of substitution at a constant loading of 4 pounds /I00 gal lons in a typical paint is shown in Table II and Figure3. There does not appear to be any "hump" at low substitutions as indicated by the previous water data. Possibly it would be attractive to remove one pound of Cellosize (from a total of 5 pounds) and replace it with 2 pounds of RG-144. The dollar saving would be worthwhile and some "extension" of the Cellosize would be effected. 4. Figure 4 shows some data for the thickening of UCAR Latex 360 with RG-144 and RG-244. Unfortunately data were not obtained for the various grades of Cellosize but possibly you can obtain some from your contacts in our coatings area. H. B. Rhodes 3/26/74 ^ W4 If 4 > C_______w wvi j?si UNION CARBIDE CORPORATION '-S7Q&____________________________________ THE DISCOVERY COMPANY MINING & METALS DIVISION P.0.B0X 579 NIAGARA FALLS. N.Y. 14302 TEL: 716-285-3311 CALIDRIA PRODUCTS FOR LATEX PAINTS IMPROVED PIGMENT EFFICIENCY "Calidria" High Purity (HP) and CG-135 products provide improved pigment efficiency in aqueous latex systems. The improvement is due to the interaction between the positively charged cnrysotile fiber and negatively charged TiO2 particles which causes the Ti62 particles to disperse and attach along the fiber. This better dispersion of TiO2 occurs during the manufacture of CG-135, a coflocculated chrysotile-rutile TiO2. The same effect is realized in situ with HP during conventional pigment grinding in latex paint manufacture. "Calidria" can be used in paints with either high or low TiO2 levels. The dis persing effect of the fibers, for example, permits higher than normal levels of Ti02 for superior one-coat hide. Dispersion of TiO2 along the chrysotile fibers also results in less pigment separation during storage. Both CG-135 and HP are available in either pelletized (P) or open (0) form. COST-PERFORMANCE ADVANTAGES Laboratory data and commercial application results indicate that. "Calidria" products can be added to latex paint systems at levels of 20 to 50 pounds/100 gallons to provide cost and/or performance advantages. They serve primarily as pigment extenders or partial pigment substitutes: (1) to improve opacity at similar cost, or (2) to reduce costs while maintaining opacity. Improved viscosity control and rneology have also been experienced. TEST FORMULATIONS AND RESULTS Table I (on the reverse side) shows a "standard" paint formulation compared to similar formulations with HPP and CG-135P replacing part of the TiO2 and cellulosic thickener. These paints were mixed with a Cowles using a 3" blade in a 3-quart can. The ingredients in the "A" bracket were added first and stirred at 2650 rpm until the Cellosize was dissolved. Next the ingredients in the "B" bracket were added quite rapidly, followed by the "Calidria" product. The latter was added in increments interspersed with water, Aerosol OT, and Nopco NXZ as needed to maintain good mixing properties. Any material left over was added at the end. Finally, the entire pigment blend was "ground" for 20 minutes at 2650 rpm and let down with the latex. Tamo! 350 and Aerosol 0T have been found particularly effective for dispersion in these systems. Table II summarizes the properties of the three'paints from Table I. TABLE 1 INTERIOR LATEX PAINT FORMULATION (Ib./lOO gal.) Inqredient Water ( Celloslze. QP-4400 I Tergitol NPX A f | Taraol 850 Lecithin Ethylene Glycol 1 Butyl Carbitol Acetate Nopco NXZ { TiO? (Du Pont R-960) B ASP-170 Cane 1-Tex J/'High Purity Pellets CG-135 Pellets C % Water I Aerosol OT \ Nopco NXZ UCAR Latex 360 Standard 269 5 3 4 1 20 15 1 250 75 155 0 0 150 2.3 2 243 With HPP 269 4 3 4 1 20 15 1 230 75 155 20 0 150 2.3 2 243 j With CG-135-P 269 !4^ 3 . '4` \l/ 20 15 ? r 220 75\ /ro' / 30 \ /150 1 2.3 2 243 TABLE II TEST RESULTS OF PAINT FROM TABLE I Physical Properties TIO2, lbs./lOO gal. Total Solids, % Viscosity, KU Freeze-Thaw Hegmann Rating Paint Film Properties Reflectance, S Contrast - Dry - Wet - Diff. Enamel Holdout (60 Gloss) Room Temperature 38PF Scrub, 7-da7 air dry Total Cycles Initial Wear, Cycles SWear Color Acceptance Apolication Properties* Foaming Framing Lapping Touch-Up Brushability Levelling, Visual Sheen Uniformity Burnish Resistance Vet Creek Resistance HjO Spot Resistance TOTALS Standard 250 53.73 91 Passed 5.0 92.0 .9670 .9600 .0070 76 68 1000 403 90 Exc. 5 15 10 15 10 5 10 10 8 5 93 With HPP 230 53.87 93 Passed 5.5 With CG-135- 220 53.72 [ 95 iPassed 5.5 91.5 .9670 .9657 .0013 75 66 1000 400 50 Exc. 8 15 . ] 1100 10 1150 10 10 108 91.5 .9730 .9600 .0130 \ v 53 looo 256 90 m X0 1 1 I i j. 11C5 1i 10J 15 10 5 10 ( 10 15 10 102 * Rated cn 1-20 scale with 20 excellent TABLE I CELLOSIZE-CALIORIA BLENDS IN HpQ Sample RG-144 1 2 3 0.9 1.8 2.7 0.75 1.50 2.25 0.5 1.0 1.5 0.25 0.5 0.75 0 0 0 in H?0 QP-52,000 0 0 0 0.1 0.2 (90-10) 0.3 0.25 0.5 (75-25) 0.75 0.5 1.0 (50-50) 1.5 0.75 1.50 (25-75) 2.25 1 2 3 Brookfield Viscosity, cps 6 rpm 60 rpm 175 1400 4000 45 120 350 175 900 2300 30 190 490 225 2150 3900 65 380 1260 700 4500 19,000 300 2150 7300 9000 42,000 75,000 41o00.s. . O.S. 3000 32,000 O.S. 1900 o.s. o.s. Th* tW /4 7 UH r.8 6. H. 7 r.i i. / -a. 3 2. / 2. 6 1, i. *O.S. - Off Scale /Gtyautt \ ^ J6,0:1. g f t o /'/, -U t ftt 3 TABLE II CALIORIA-CELLOSIZE BLENDS IN A STANDARD LATEX PAINT (Added at 0.04 Ib./gal.) Blend Composition, Parts per hundred_______ RG-144 QP-52,000 0 100 25 75 50 50 75 25 90 10 Stormer Viscosity, _______ ku____________ 95 85 73 >4^J) 59 Relative Cost, cents/ku* 0.296 0.272 0.227 0.158 0.105 * QP-52,000 @ 74/lb. CG-120 9 9/lb. l i l tt o X IO TO IN C H AO O 7 n o