Urethane foam catalyst

Urea, 3-oxo-A4-1,2,4-thiadiazolin-5-yl-synthesis, 6, 592 Urea, thio-cyclic derivatives toxicity, 1, 138-139 toxicity, 1, 139 Urethane foam catalysts, 1, 405-406 Urethanes... 

Staff Written, "Additives and Modifiers - Urethane Foam Catalysts, Plastics Compounding 1991192 Redbook, 14(4) 56-58 (July/August 1991). 

Ethylamine is primarily used in the production of triazine herbicides. Ethylamine has also found use in resin chemistry, oil refining, and solvent extraction as a stabilizer for latex rubber and in the manufacture of dyestuffs, medicinals, corrosion inhibitors, urethane foam catalysts, and agents used in wash-and-wear fabrics. 

Cata-Chek, Urethane foam catalysts, Ferro Corp., Polymo" Additives Div. 

Cata-Chok Urethane foam catalysts, Ferro Caytur Curing agent, catalyst. Uniroyal... 

In more recent years, molded flexible foam products are becoming more popular. The bulk of the molded flexible urethane foam is employed in the transportation industry, where it is highly suitable for the manufacture of seat cushions, back cushions, and bucket-seat padding. TDI prepolymers were used in flexible foam mol ding ia conjunction with polyether polyols. The introduction of organotin catalysts and efficient siHcone surfactants faciHtates one-shot foam mol ding, which is the most economical production method. 

Figure 3b. A plot of the Mean Cnrvatnre data versns the 40% Compression Deflection valnes for the urethane foams made with constant tin catalyst concentration calculation by RS/1 for a polynomial fit.

The foams can be obtained by the action of a diiscyanate on a polyol and water. The reaction with water forms carbon dioxide and the reaction with polyol forms a urethane polymer. Catalysts play a crucial role in the process. Tin octeate and dibutyl tin dilaurate are preferred catalysts along with tertiary amines. 

Aryl phosphates were introduced into commercial use early in the twentieth century for flammable plastics such as cellulose nitrate and later for cellulose acetate.26 In vinyls (plasticized), arylphos-phates are frequently used with phthalate plasticizers. Their principal applications are in wire and cable insulation, connectors, automotive interiors, vinyl moisture barriers, plastic greenhouses, furniture upholstery, and vinyl forms. Triarylphosphates are also used, on a large scale, as flame-retardant hydraulic fluids, lubricants, and lubricant additives. Smaller amounts are used as nonflammable dispersing media for peroxide catalysts. Blends of triarylphosphates and pentabromodiphenyl oxide are extensively used as flame-retardant additives for flexible urethane foams. It has been also... 

Polyurethane is a condensation polymer generally formed by the reaction between a di-isocyanate and a hydroxylated-terminated resin known as polyol in the presence of a catalyst and a foaming agent The urethane foam formed as a result of this reaction is a cellular polymer that derives its mechanical properties in part from the cell matrix formed during its manufacture and in part from the intrinsic polymer properties. Choice of the di-isocyanate and polyol dictates the inherent polymer properties in addition filler materials may be added to the polymer to improve its mechanical properties. 

H. W. Wolfe, Jr., Foam Bulletin, Catalyst Activity in One-Shot Urethane Foam, E. I. DuPont deNemours and Co., March 16, 1960. 

In the case of urethane-foam formation, tin catalysts (Table 8) mainly promote the reaction between isocyanate and hydroxyl groups, i.e., the formation of the urethane linkage. 

Preparation. Polyurethane foams (often referred to as urethane foams) are prepared by the reaction of a polyisocyanate with a polyol in the presence of a blowing agent, a surfactant, and a catalyst without external heating of the foaming system. The principle of preparation of urethane foams is based on the simultaneous occurrence of two reactions, i.e., polyurethane formation and gas generation in the presence of catalyst and surfactant, as shown below ... 

The blowing agent for microcellular elastomers is water. The amount of water should be accurate, and its accuracy can be obtained by a water-containing solution, such as liquid sodium sulfonate of vegetable oils containing a small amount of water. The catalysts to be used are those used in urethane foams, e.g., tertiary amines, and tin catalysts. The above ingredients are mixed and poured into a hot mold and cured in a defined period of time. After demolding, a post cure is applied to complete the polymer-formation reactions. 

In most cases semi-rigid urethane foams are produced by using two-component systems, that is component A (polyisocyanate component) and component B (blend of the remaining ingredients, i.e., polyol, blowing agent, catalyst and surfactant). 

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