claims, is a big improvement over those currently used. Spencer's a g chemical vp, J. C. Denton, feels that Spensol Greeen solutions are a big step forward toward better ammoniating solutions for fertilizer mixtures. Actually, h e says, this is the first really n e w solution development in 10 years. • Corrosion Testing. Spencer's corrosion tests use a 2- b y 3-inch mild steel test plate welded in the middle. Sandblasting takes mill scale off the plate, which is t h e n weighed and put into t h e ammoniating solution in a pressure p a n . After one week, the plate is cleaned u p and weighed again —weight difference is corrosion loss. Spencer tested about 150 different inhibitors during a 12-year program. Until now, the most effective one was being used in its ammoniating solutions, which contain ammonia, ammonium nitrate, and water. T h e 4 0 % figu r e comes from comparing the n e w inhibitor with the old one. Expressing corrosion of carbon steel as inches penetration per year, here's h o w average lab results stack u p :
CHEMICALS
Inches per year Uninhibited Spensol S t a n d a r d Spensol (old inhibitor) Spensol Greeen ( n e w inhibitor)
Spensol Greeen ammoniating solutions cut down on e q u i p m e n t corrosion. These are test plates and t h e pressure p a n used i n Spencer's corrosion tests. Plate on left has lighter color t h a n t h e other one, indicating greater corrosion
Greeen-up Time Spencer markets n e w Spensol Greeen ammoniating solutions that help fight corrosion JVLlXED
FERTILIZER
MAKERS,
often
plagued by corrosion, got a helping hand last week from Spencer C h e m i c a l . In the hand: a n e w line of less corrosive ammoniating solutions. Containing an improved inhibitor, t h e Spensol Greeen solutions cut corrosion by about 4 0 % , thus prolong the life of conventional steel equipment, claimts the company. And the new inhibitor is now in Spencer's line of nitrogen solutions for direct application, too. 54
C&EN
FEB.
3,
1958
Ammoniating solutions, being highly alkaline, are rough on mild (carbon) steel. Solution corrosion, says Spencer's technical director Ralph Miller, most quickly attacks the weld bead on the equipment. Once a solution eats through the weld, in a tank for instance, t h e tank is useless—regardless of what shape the rest of the metal is in. So all ammoniating solutions on the market today use a corrosion inhibitor. But its new inhibitor, Spencer
0.350 0.017 0.011
These test results cannot be directly ^interpreted to m e a n 4 0 % longer service for equipment. But, says Miller, the corrosion test is the most valid and reproduceable one they know of. And he definitely expects Spensol Greeen to help lengthen t h e life of conventional steel tanks, dip pipes, lines, and spargers. • O t h e r Corrosion W o r k . Spensol Greeen is only o n e result of Spencer's corrosion research. In t h e works right now is an improved sparger—more corrosion resistant t h a n the ones commonly used, and one that gives better distribution during the fertilizer mixing process. The new sparger is in commercial testing now, and Miller says results to date are encouraging. C1
New Silicone Compound D o w Corning has a new organo functional silicone chemical. It's an epoxy silicone combination with an epoxy group on each end of t h e molecule. D o w Corning tags the c o m p o u n d
Syl-Kem 9 0 , short for l,3-bis[3-(2,3~ epoxypropoxy) propyl]-tetramethyldisiloxane. Syl-Kem 9 0 undergoes t h e typical reactions of glycidyl ethers, says the company. Thus, it's possible t o attach the compound to a wide variety of chemicals. T h e silicone modifica tions are hybrids and may add useful silicone properties to t h e original chemical. The chemical will find use, D o w Corning thinks, in t h e manufacture of resins, dyes, waxes, oils, plasticizers, light stabilizers, heat stabilizers, phar maceuticals, a n d fungicides. Early work has shown that Syl-Kem 9 0 will greatly improve the resistance t o low temperature cycling when added t o common epoxy casting resins, t h e com pany says. Epoxy curing agents m a d e with t h e compound also show similar improvements. And, D o w Corning adds, w h e n it's used as a reactive dilu ent, solid epoxy resins can b e m a d e into liquid formulations suitable for casting. C2
Crystalline Structure is best in GROGO 55L Stearic Acid • Adhesive for cellulose a c e t a t e film, Cellugrip, can b e used t o bond film t o itself a n d other surfaces. This fastgrabbing, solvent-based cement c a n also b e used for welding molded cellu lose acetate parts together, says t h e manufacturer, A d h e s w e Products. C 4 • Barium nitrate and antimony sul fide for glass a n d ceramic applications are available from H u m m e l Chemical. Both are i n finely ground, high purity forms. Barium nitrate can be used t o replace alkali nitrates in making optical glass a n d enamels. Antimony sulfide can b e used to make a cloudy amber or ruby glass. Other applications include adherence of white enamel to steel and in enamel batches a n d hollo ware t o produce mottled gray effects. C5
W h a t you see above is n o accident. W e broke this slab of G R O C O 55L t o reveal the true stearic-palmitic crystal structure. I t is a sure indication of the most favorable balance between palmitic and stearic acids — approximately equal parts. This ratio is a must if you a r e to produce cosmetic creams t h a t won't shrink from t h e walls of their containers. O r buffing compound sticks or bars t h a t release easily from their molds. T h e 0.2 maximum iodine value for G R O C O 5 5 L — a new, high commercial standard — is equally outstanding. It i s one reason why G R O C O 5 5 L holds t o its brilliant whiteness — either in storage or under heat — a n d why products based on it stay p u r e and fresh longer. Add exceptional freedom from odor that carries through to t h e e n d product. Unequalled freedom from esters. Unmatched low content of unsaponifiables. Complete freedom from metallic contamination. Assured uniforrnity from ship ment to shipment. T h e sum total of so many top qualities in a single product clearly suggests that you "Always Specify A. Gross" when it comes to stearic acid. ΥοχιΈ come out better — whether you make cosmetics, toilet goods, soap, pharmaceuticals, food emulsifiers, plastics or paints. Send for samples
• Three n e w l a m i n a t i n g adhesives f o r
packaging a n d industrial applications are available from National Starch. Resyn 30-1246 is recommended for laminating metallized Mylar to calen dered vinyl film. Resyn 36-6327 is a synthetic rubber-based lacquer for use in laminating treated polyethylene t o clear Mylar a n d all saran coated films. Resyn 36-6328 is a synthetic rubberbased lacquer for laminating clear My lar and metallized Mylar to themselves and to paper. C6
and brochure,
"Fatty
Acids in Modern
Industry."
FATTY ACIDS Stearic Acids · Red Oils · White Oléines Tallow Fatty Acids* Coconut Fatty Acids · Vegetable Fatty Acids Hydrogenated Fatty Acids · Hydrogenated Tallow Glycerides
a-gross A COMPANY
295 Madison Ave., N. Y. 17, N. Y.
·
Distributors
Manufacturers
in principal
cities
FEB.
·
3.
Factory: Newark, N. J .
195 8
since J837
C&EN
5 5
CHEMICALS
defoam with
NEW SURFYNOL
104Α NTew liquid Surfynol 104A, latest in Airco's surface active Surfynol series, has proved itself an excellent defoamer in aqueous systems, particularly in the following applications: • latex paints (PVAc,
• • • • • •
butadiene-styrene
and
acrylic)
paper coatings stripping synthetic latex paper a n d textile sizing starch a n d protein adhesîves metal cleaners l o w sudsing detergents
Try Surfynol 104A in your system. J u s t write or call for the new defoaming bulletin. Samples and technical assistance available on request.
A I R REDUCTION CHEMICAL COMPANY A
division of Air
Reduction Company, Incorporaled
150
East 4 2 n d Street, N e w York 1 7 , Ν . Υ. M U r r a y Hill 2 - 6 7 0 0 , Ext. 3 3 4 Represented internationally by Airco Company Iniernational
56
C&EN
FEB.
3,
1958
Film Production Gets Rolling Celanese has begun production of triacetate film at Belvidere, N. J., will market it to independent emulsion coaters as a base for photographic film. In t h e process, viscous triacetate "dope" flows through a slit onto a highly-polished revolving surface. Here, the film can b e seen passing through a glass-enclosed visual inspection point on t h e way to a dryer. Celanese makes the film in 45-inch widths on rolls in lengths up to several thousand feet. Initially, it will come in two gages—0.0035 and 0.0054 inches thick. C3 • Soil fumigant for control of weed seeds and soil pests is now available in a different formulation from Union Car bide. Its Crag Mylone 50D now is mixed with wheat bran, emulsifier, and mineral oil; it will be sold to formulators for marketing under their brand names. C7
• An all-acrylic laminating resin has
• A parting compound to prevent braz ing of certain surfaces during furnace brazing operations is available from Wall Colmonoy. The material, called White Stop-Off, is mixed with a volatile plastic, Nicrobraz Cement, to a con sistency suitable for brushing, dipping, or spraying. Residue following braz ing can be removed by air-blasting or brushing. C8
• A lacquer t o inhibit
• Gravure inks for multicolor printing of vinyl film, sheeting, and coated fab rics are available from Claremont Pig ment. C9
been developed by D u Pont in sirup form and will be test-marketed under t h e trademark Lucite. The sirup gives laminates an initial water-whiteness and relative freedom from color changes even after prolonged periods of outdoor exposure. CIO discoloration
and other degradation of glass-rein forced polyester panels caused by ex posure to weather and sunlight is being made by Durez Plastics Division of Hooker. Hetrolac 105 can b e brushed or sprayed, will dry tack-free in five to 10 minutes, and can be stored in definitely in closed containers in a cool place, the company says. C11 • Lead-filled e p o x y resin f o r use as a
radioactive shield or as a high density (Continued on page
110)
( S i t u a t i o n s Wanted., Continued) BIOCHEMIST : Ph.D. Purdue University, June, 1958. Organic s n d bacteriology minors; teaching a n d gra-duate research assistant. Ex perience in enzymes, radioisotopes, intermediary metabolism. Publications, veteran, age 29, mar ried, three children. Desires academic or in dustrial basic research position. Prefer far west location. Box 320-F-2, C.
