PRODUCTION
NEW CHEMICALS AND SPECIALTIES Rubber-Phenolic Varnish A rubber-phenolic varnish, 12359, that is said to permit the manufacture of lami nated plastics having two t o three times the impact strength of those made with conventional varnishes is being made by General Electric
For further information on any item or process mentioned here, see coupon on page 1328 perature cement is blown on the outside of vats from a gun. Then the first coat of protective phenolic resin is put on the inside. Raw flame is then applied to the interior with a specially designed propane gas burner. As the phenolic resin is being baked, the cement dries. A final coat of insulating cement, of the same thickness, is then sprayed on, and another interior resin coating is applied. Each inside coating job takes 6 hours, and there may be as many as 10 separate bakings. CS 3
Molding Compound
Multiple exposure shows GE rubberphenolic laminates can be flexed without breaking. T h e y have high impact strength Gears, shuttles, tubing, and castor wheels are representative of the job where rubber-phenolic laminates are expected to make contributions, according to GE. The company says rubber-phenolic varnishes applied to papers for packaging give in creased strength and improved resistance to moisture. CS 1
Resin StabiRzer Witco stabilizer No. 80, liquid stabilizer for polyvinyl chloride resins, is said to contain 100% active ingredients consisting of barium and cadmium soaps in combina tion with a synergistic stabilizer. Witco says No. 80 imparts good initial color and clarity to transparent sheets, is efficient under dynamic heat conditions, affords lubricity and release properties, and requires no pregrinding for complete dis persion. CS 2
High T e m p e r a t u r e Cement Insulates Vats During Baking Baking a protective interior coating on industrial vats has been made safe and economical through t h e use of vermiculite high temperature cement. Vermiculite high temperature cement, a product of the Zonolite Co., Chicago, is blown on the outside of vats with a system developed by Industrial Coatings, Ltd., Vancouver, B. C. The Canadian firm applies protec tive coatings for large vats and other equipment used in pulp and paper mills, breweries, chemical plants, and canneries. A Vs-inch layer of vermiculite high tem-
A thermoplastic molding and extrusion compound which is said to retain its tough ness and high impact strength at tem peratures as low as —60° F. has been de veloped by Naugatuck Chemical Division, U. S. Rubber Co. The material, known as Kralastic J, is a styrene copolymer. Its initial uses are ex pected to b e primarily military applica tions where a plastic with low tempera ture toughness is required. CS 4
Low-Cost Plasticizer for Vinyls What is said to b e an inexpensive pri mary vinyl plasticizer of low volatility has recently b e e n developed b y Rohm & Haas. Designated Monoplex S-38, this high molecular weight monomelic plasticizer may be employed as the sole plasticizer, in blends with the Paraplex plasticizers, and in compounds containing low-cost secondary plasticizers and extenders. Be cause of its rather dark color the company says that Monoplex S-38 is generally suit able for only filled and pigmented com pounds. CS 5
Adhesive for M e t a l Bonding An adhesive strong enough to make lap joints in aluminum alloy sheets for air plane construction has been developed by Ciba Co. .Newly developed adhesives in some instances are said to have the full strength of Alclad aluminum. Strength in shear is comparable to spot welding and riveting, and sometimes higher. Araldite resins consist of many varia tions of a group of ethoxylene oxide com pounds with acid anhydrides, amines, and other compounds as hardening agents. All of the resins are thermosetting compounds which cure without evolution of water or volatile matter at room or elevated tem peratures. The general result is an ad hesive of high resistance to acids and alkalies. Use of this class of resin ad hesives solves many problems that were
CHEMICAL
previously difficult; for example, the bond ing of metallic materials to nonmetallics and unlike metals t o each other. Shear tests are made on a BaldwinSonntag 12-H hydraulic testing machine of 12,000 lb. capacity. Test specimens consist of two 1-in. strips of 16-gage Al clad aluminum bonded together with an overlap of 0.5 in. to fonn strips 11.5 in. long. Tensile loads as high as 2500 lb. have been applied on the half square inch bond before failure in shear. CS 6
PRODUCT
MOTES
Poper Treating Resin. A new resin which is reported to impart greater wetstrength to paper than any other product of its type is being made by Plaskon Divi sion, Libbey-Owens-Ford Glass Co. This resin, designated Plaskon Aminoplast 34811L, has shown significant improvements over both urea and melamine-formaldehyde types of wet-strength resins now in commercial use, according to the company. The aminopiast resin is said to deliver up to 3 3 % more wet tensile strength than equal amounts of urea resins. CS 7 Phthalocyanine Slues. Whittaker, Clark & Daniels have added three phthalocyanine blues to their line. They are Aqua marine Blue # 1 6 7 0 , Synthaline Blue #1υί>0, and Synthaline Blue Flushed #1949, developed by Thomasset Colors. Aquamarine Blue # 1 6 7 0 is a 2 0 % blue in paste form, suitable for water paints, water colors, latex emulsions, wall paper colors, and leather finishes. Synthaline Blue # 1 9 5 0 is a dry phthalocyanine blue that is nondusting and noncrystallizing, and has low oil absorption. Synthaline Blue Flushed # 1 9 4 9 composition is 20% blue, 4 0 % long oil alkyd, 4 0 % solvent, for use in the manufacture of paints and enamels. CS 8 Exterior Water Repellent. Daracone, a high silicone content water repellent for exterior masonry, is manufactured by Dewey and Almy Chemical Co. Used on above-grade masonry, Daracone penetrates the surface leaving no film to wear away, peel, or scale off. It cannot be dissolved b y water, wall not oxidize with age, and has an effective life of from 5 to 10 years. CS 9 Damp Surface Enamel. Wilbur & Wil liams C o / s odorless dampcoat enamel enables painting over damp surfaces as well as dry. Six basic intense colors are available for intermixing with white and themselves. This color system is said to eliminate any tinting tube or agitant, merely calling for intermixing. CS 10 Aluminum Stripper. Star Stripper Ν is made for the cold stripping of various types of synthetic coatings from aluminum and its alloys, that are normally difficult to strip by the usual cold or hot types of strippers. The most tenacious coatings are said to b e easily removed without attack to the basis aluminum metals. CS Π
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ENGINEERING
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