Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
  • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
  • D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
  • D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • D06M15/643—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain

Definitions

• This invention relates to a method of rendering cellulosic fabrics water repellent. e
• a cellulosicfabric is treated with an organosilicon composition, thensubjected to compressive shrinkage and thereafter heated at a temperature of at least 100 F. until the siloxane is cured.
• compressive shrinkage of the fabric may be accomplished in any convenient manner.
• the cloth may be compressed by means of stenters or by holding the fabric against a sheet of an elastic material as the surface of the sheet adjacent to the cloth is alternately expanded and contracted. As the surface of the elastic material contracts, the fabric is thereby compressed so that the weft threads are pressed close together causing the warp threads to assume a more sinuous configuration.
• Compressive shrinkage is used primarly to prevent shrinkage of cellulosic fabrics during washing.
• Organosilicon compositions which are operative in this invention include all hydrolyzable silanes, alkali metal salts of organosila'nols and siloxanes, having on the average from 1 to 2.5 monovalent hydrocarbon radi cals per silicon atom.
• the silanes which are operative herein include, for example, monomeric silanes such as dimethyldichlorosilane, monomethyltriethoxysilane, ethyldiethoxysilane, octadecyltriacetoxysilane, trimethylchlorosilane, vinyldiisopropoxysilane, phenylmethyldimethoxysilane; polymeric silanes such as methylsilazanes, methylpolysilanes containing SiSi linkages such as dimethyltetramethoxyisilane and silcarbanes such as- Me (C H O)SiCH Si(OC H )Me g and siloxanes such as methylhydrogensiloxane, 'dimethylsiloxane, monomethylsiloxane, octadecylmethylsiloxane, octadecylhydrogen siloxane, 'phenylhydrogensiloxau
• the organosilicon compounds employed in this invention can be any combination of the ab'ovedefined hydrolyzable silanes, siloxanes and tions, the cloth is usually wet with water prior to comprior to compressive shrinkage of the fabric. This can be done in any convenient manner.
• a liquid organosilicon compound or a solution or an emulsion of an organosilicon compound can be sprayed onto the fabric or the fabric can be dipped into a liquid organosilicon compound or into a solution or an emulsion of an organosilicon compound.
• the fabric may be exposed to the vapors of a volatile organosilicon compound.
• organosilicon compound applied to the fabric can be varied to suit the particular use to which the fabric is to be put. In general, satisfactory water repellency is obtained when the fabric contains from 1 alkali metal salts.
• the organosilicon compounds which are operative herein include partially hydrolyzed alkoxylated siloxanes and partially hydrolyzed alkoxylated siloxanes which contain SiSi linkages and SiCSi linkages such as those obtained by alkoxylating the distillation residue from the reaction of methylchloride and silicon.
• the preferred compounds for use in this invention are combinations of methylsiloxanes and methylhydrogensiloxanes such as those which are particularly described in U. S. Patent 2,588,365.
• the fabric After the fabric has been treated with the organosilicon compound and subjected to compressive shrinkage, it is then heated in any convenient manner at a temperature of at least F. This serves to cure the organosiloxane.
• the treated fabric is heated at temperatures of 300 F. to 450 F. or higher.
• Example 2 When the process of Example 1 is repeated except that the cloth is passed through an atmosphere of the vapors of methyldiethoxysilane and dimethyldiethoxysilane in amount of 75 parts by volume of the former and 25 parts by volume of the latter, the concentration of the vapors being such as to give a 2 percent by Weight pick-up of methylsiloxanes on the fabric, the resulting fabric is water repellent and does not shrink whenwashed.
• the method of rendering cellulosic fabrics'water repellent which comprises treating the fabrics with an organosilicon composition of the group consisting of hydrolyzable silanes, alkali metal salts or organosilanols and siloxanes, said organosilicon composition having on When a cotton fabric' is passed 1 the average from 1 to 2.5 monovalent hydrocarbon radicals per silicon atom, subjecting the fabric to mechanical compressive shrinkage and thereafter heating it at a temperature of at least 100 F. until the organosilicon compound is cured.
• a method of rendering cotton fabrics water repellent which comprises treating the fabric with a methylhydrogenpolysiloxane having on the average from 1 to 2.5 methyl groups per silicon atom, subjecting the fabric to mechanical compressive shrinkage and then heating it at a temperature of at least 100 F. until the siloxane is cured.
• a method of rendering a cotton fabric water repellent which comprises treating the fabric with an alkali metal salt of a methylsilanol, said salt having on the average from 1 to 2.5 methyl groups per silicon atom,
• the method of rendering cellulosie fabrics water repellent which comprises wetting the fabric with water, treating the fabric with an organosilicon composition of the group consisting of hydrolyzable silanes, alkali metal salts of organosilanols and siloxanes, said organo silicon composition having on the average from 1 to 2.5 monovalent hydrocarbon radicals per silicon atom, subjecting thegfabric to mechanical compressive shrinkage and thereafter heatingit at a temperature of at least 100' F. until the organosilicon compound is cured.
• organosilicon composition of the group consisting of hydrolyzable silanes, alkali metal salts of organosilanols and siloxanes, said organo silicon composition having on the average from 1 to 2.5 monovalent hydrocarbon radicals per silicon atom, subjecting thegfabric to mechanical compressive shrinkage and thereafter heatingit at a temperature of at least 100' F. until the organosilicon compound is cured.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Priority Applications (4)

Applications Claiming Priority (1)

Publications (1)

Family

ID=23343064

Family Applications (1)

Country Status (4)

Cited By (9)

Citations (5)

• 0
  • BE BE527292D patent/BE527292A/xx unknown
• 1953
  • 1953-03-16 US US342738A patent/US2833022A/en not_active Expired - Lifetime
• 1954
  • 1954-01-25 GB GB2230/54A patent/GB755028A/en not_active Expired
  • 1954-03-15 FR FR1097096D patent/FR1097096A/fr not_active Expired

Patent Citations (5)

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