CONCENTRATED AQUEOUS EMULSIONS FOR WATERPROOFING TEXTILES

摘要

1296868 Textile-treating polysiloxane emulsions RHONE-POULENC SA 28 Sept 1970 [29 Sept 1969] 46089/70 Headings C3B and C3T [Also in Division D1] A storage-stable aqueous emulsion contains less than 80 wt. per cent of water, and solids comprising a mixture of methyl hydrogen polysiloxane and methyl polysiloxane and 0À1-10 wt. per cent of the polysiloxanes of an emulsifier and 1À5-30 wt. per cent of the polysiloxanes of a curable water-soluble condensate from a polymer having repeating units wherein R is H or a C 1-4 alkyl group, n is 2 or more, x is 1-7 and A is -CO-, -CS-, -CO-Q-, or -CO-Q1-CO-, wherein Q is a C 2-6 alkylene group and Q1 is a divalent organic radical, and a compound having at least one epihalohydrin or halohydrin group or at least two epoxy groups. The amino polymer may be obtained by reaction of a polyalkylene polyamine with a dicarboxylic acid, an α,#-unsaturated carboxylic acid, or urea or thiourea. An inert hydrocarbon solvent for the polysiloxanes may be used, e.g. in amount 20-80 wt. per cent of the polysiloxanes. Fabric-treating emulsions are obtained by adding a metal or organometal carboxylate catalyst and more water. In examples a mixture of a polydimethylsiloxane oil of 1000 or 10,000 cs/20‹ C. and a polymethylhydrogensiloxane oil of 20 cs/20‹ C., both trimethylsiloxy-terminated, is dispersed in water using a polyvinyl alcohol or a n-octylphenol decaethylene glycol ether as emulsifier, and a 9 or 10% aqueous solution of a diethylene triamine/adipic acid/epichlorhydrin condensate, optionally stabilized with formaldehyde, is added. The product is added to water with an emulsion of zinc and dibutyltin 2-ethylhexoates in toluene solution in water to give a fabrictreatment bath.