| 摘要 |
<p>An aqueous emulsion for treating fabric comprises one or more organic solvents having dissolved therein one or more blocked urethane prepolymers and one or more curing agents therefor, emulsified in water. Preferably, the emulsion contains at least 50% solids and before being applied to a fabric is diluted to about 1-15% solids. The polyurethane prepolymer may be derived from castor oil, ethylene glycol/propylene glycol adipate polyesters or polyethers. The blocking agent may be ketoximes, e.g. methyl ethyl ketoxime, cyclohexanone oxime, dimethyl ketoxime; imines, e.g. ethylene imine, propylene imine; alcohols, e.g. methanol, ethanol and propanol and secondary amines, e.g. morpholine and dibutyl amine. Solvents which may be used to prepare the prepolymer are: benzene, xylene, methylene chloride, toluene, cellulose acetate, perchloroethylene, acetone and methyl ethyl ketone. An emulsifying agent, e.g. sorbitan monolaurate, monoplamitate, tristearate, trioleate and polyoxyethylene sorbitan monolaurate may be added. A colloid stabilizer, e.g. SiO2, carboxymethyl cellulose, polymethylmethacrylates, ethyl cellulose or hydroxyethyl cellulose may be added. The curing agent may be: triethanolamine, triisopropanolamine, or N,N,N1,N1 - tetrakis - (2 - hydroxypropyl) ethylene diamine. Catalysts, e.g. triethylene diamine, lead octoate or benzoate, lead oleate or acetyl acetonate, lead 2-ethyl hexoate or stannous octoate may be incorporated. In a typical Example (1) a propylene glycol/ethylene glycol adipate polyester was reacted with excess toluene diisocyanate and the prepolymer mixed with methyl ethyl ketoxime, toluene and tetratis (2-hydroxypropyl) ethylene diamine. Tap water and hydroxyethyl cellulose were added and the mixture emulsified. In Example (7) a fabric was treated with the emulsion and heated to 300 DEG F. to cure the polymer.ALSO:Fabrics are treated with an aqueous emulsion which comprises one or more organic solvents having dissolved therein one or more blocked urethane prepdymers and one or more curing agents therefor, emulsified in water. The fabric is then heated to vaporize the water and solvent, unblock the blocked prepdymer and effect curing of the prepdymer. Before being applied to the fabric the emulsion is diluted to about 1-15% solids. The curing agent may be: trilthanolamine, triisopropanolamine a N, N, N1, N1 tetrakis (2 hydroxypropyl) ethylene diamine. The prepdymer may be derived from castor oil, a polyether or polyester. An emulsifying agent e.g. sorbitan m monolaurate, monopalmitate, tristearate, trioleate and polyoxyethylene monolaurate may be added. Also a colloid stabilizer e.g. SiO2, ethyl cellulose, carboxymethyl cellulose, polymethyl-methacrylates or hydroxyethyl cellulose may be added. In a typical Example (7) an emulsion derived from a castor-oil-toluene diisocyanate prepdymer blocked with methyl ethyl ketoxime and containing tetrakis (2 hydroxypropyl) ethylene diamine, toluene and tap water was padded on scoured and bleached botton print cloth. The padded fabric was dried at 180 DEG F. and heated to 300 DEG F. to cure the prepdymer. In a comparative Example (8) a cotton textile fabric was treated by padding with a bath containing: urea formaldehyde resin, aqueous zinc nitrate catalyst, isooctyl phenol polyethoxy ethanol wetting agent and deionized water. The fabric was dried, washed with soap and water, rinsed, dried and ironed and conditioned at 70 DEG F. at 65% humidity for 24 hours. In a further comparative Example (9) a fabric was treated with butadiene/acrylonitrile copolymers.</p> |
