| 摘要 |
<p>A liquid composition for rendering textiles water-repellent and crease resistant comprises (1) a urea- or melamine-aldehyde condensation product, (2) a liquid polysiloxane having 1.75 to 3.0 monovalent hydrocarbon radicals per silicon atoms, and (3) the liquid hydrolysate of a methyl hydrogen dihalogen silane. The urea and melamine condensates specified are those obtained from formaldehyde, acetaldehyde, propionaldehyde and furfuraldehyde, the preferred ones being the water-soluble dimethylol urea and tri- and hexa-methylol melamines. The treating liquids are preferably aqueous emulsions containing, by weight, 70 to 98 per cent. water, 0.5 to 15 per cent. of the urea or melamine condensate, 0.4 to 12 per cent. of the liquid polysiloxane free from silicon-bonded hydrogen and 0.05 to 3.0 per cent. of methyl hydrogen polysiloxane. Emulsufying agents specified are technical alkyl dimethyl-3:4-dichlorobenzyl ammonium chlorides in which the alkyl radicals contain 8 to 18 carbon atoms (tetrosan) and stearamine acetate. In examples, aqueous emulsions are made from (1) the hydrolysate of CH3.H.SiCl2, stearamine acetate, liquid dimethyl polysiloxane, dimethylol urea and toluene, and (2) vinyl acetate emulsion polymer, urea-formaldehyde condensate, a trimethyl silyl end blocked dimethylpolysiloxane, the liquid hydrolysate of CH3.H.SiCl2 and tetrosan. Specifications 572,740, [Group VIII], 585,947 and 586,187 are referred to.ALSO:Textiles, such as cotton poplin, rayon and wool rayon gaberdine, are rendered crease-resistant by treatment with a liquid composition comprising (1) a liquid polysiloxane having 1.75 to 3.0 monovalent hydrocarbon radicals per silicon atom, (2) a urea- or melamine-aldehyde condensation product, and (3) a liquid methylhydrogen polysiloxane [see Group IV(a)]. The treating liquids are preferably aqueous emulsions. In examples, textiles are treated with aqueous emulsions containing (1) the hydrolysate of CH3 H, Si Cl2, stearamine acetate, liquid dimethylpolysiloxane, dimethylol urea and toluene, and (2) vinyl acetate emulsion polymer, urea-formaldehyde condensate, a trimethylsilyl end blocked dimethylpolysiloxane, the hydrolysate of CH3 H, Si Cl2 and an emulsifying agent, and the treated textiles are dried and cured. Specifications 572,740, [Group VIII], 585,947 and 586,187 are referred to.</p> |
