Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
  • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
  • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
  • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
  • D06N3/141—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes mixture of two or more polyurethanes in the same layer
• • A—HUMAN NECESSITIES
  • A41—WEARING APPAREL
  • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
  • A41D31/00—Materials specially adapted for outerwear
  • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
  • A41D31/10—Impermeable to liquids, e.g. waterproof; Liquid-repellent
  • A41D31/102—Waterproof and breathable
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/23907—Pile or nap type surface or component
  • Y10T428/2395—Nap type surface
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
  • Y10T442/2041—Two or more non-extruded coatings or impregnations
  • Y10T442/2098—At least two coatings or impregnations of different chemical composition
  • Y10T442/2107—At least one coating or impregnation contains particulate material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
  • Y10T442/2213—Coating or impregnation is specified as weather proof, water vapor resistant, or moisture resistant
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
  • Y10T442/2221—Coating or impregnation is specified as water proof
  • Y10T442/2246—Nitrogen containing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
  • Y10T442/30—Woven fabric [i.e., woven strand or strip material]
  • Y10T442/3325—Including a foamed layer or component
  • Y10T442/3366—Woven fabric is coated, impregnated, or autogenously bonded
  • Y10T442/3374—Coating or impregnation includes particulate material other than fiber

Definitions

• the invention relates to a process for the production of polyurethane-coated textile fabrics, the use of polyurethane-coated textile fabrics and their use for the production of breathable and water-repellent finishing.
• Fabrics are increasingly in demand for sports, leisure and rain protection clothing, which on the one hand are water and wind resistant on the outside, and on the other hand discharge water vapor from the inside to the outside.
• the textiles provided are made hydrophobic. This gives good breathability and water repellency (water repellency), but not water resistance.
• water repellency water repellency
• several new developments have been presented to improve water resistance, for example in chemical fibers / textile industry, 36th / 88th. Volume, 1986, p. 66.
• One possibility is the lamination of a carrier material with membranes or microporous foils based on hydrophilic copolyesters or polyurethanes, the porosity sometimes having to be created subsequently by fine perforation of the plastic sheets by means of electron beams.
• Another possibility is to coat a support with solvent-containing polyurethanes to form a compact, microporous PU layer.
• All of these processes have disadvantages in that solvent-based adhesives have to be used for the lamination and solvents have to be used for the coating, the processing of which increasingly poses problems with regard to costs, flammability, toxicity and pollution.
• a fibrous, porous sheet material is impregnated with an aqueous, ionic dispersion of a polyurethane with covalently bound, solubilizing, ionizable groups and then coagulated with aqueous acid or alkali solutions.
• the procedure requires working with large amounts of liquid, firstly during the coagulation itself, but then also when washing out and neutralizing the coagulant used; this means that a multitude of aggregates is required for this process, which are not available in most equipment factories.
• a coagulation time of 5 minutes does not correspond to normal practical conditions because it makes rational production impossible.
• the object of the invention is to improve the durability of the polyurethane layer applied to such a sheet material and thus to achieve a long-lasting water-tightness of the coated material, which also withstands cleaning and washing.
• polyurethane dispersions which can be used for the process according to the invention are commercially available and are prepared by known processes, as described, for example, in DE-OS 29 31 044. They contain polyurethanes with ionic or ionizable groups which are covalently bonded to the main polymer chain and which disperse the polymer in water enable. If the solubilizing, covalently bonded groups are carboxyl or sulfonic acid groups or their salts, one speaks of anionic polyurethane dispersions. If the solubilizing group covalently bound to the polymer chain is an amino group or its salt, it is a cationic polyurethane dispersion.
• Such dispersions often contain a solids content of between 10 and 60% by weight, usually between 30 and 50% by weight.
• the viscosity of the commercially available, aqueous polyurethane dispersions can vary widely between 10 and 200,000 mPa.s.
• Such process steps are familiar to the person skilled in the art of coating technology, and he can determine the correct selection according to the type and amount of the necessary viscosity regulators with a few preliminary tests.
• the coating pastes are preferably adjusted to viscosities between 50,000 and 200,000 mPa.s.
• the anionic and cationic polyurethane dispersions are used in a weight ratio of 1: 2 to 2: 1, preferably in a weight ratio of 1: 1, for the primer and topcoat according to the in-line two-coat technology.
• Preference is given to amounts by weight of oppositely charged aqueous polyurethane dispersions such that the anionic and the cationic, covalently bonded, solubilizing groups are present in stoichiometrically equivalent amounts.
• the procedure can be such that the anionic dispersion is spread onto the substrate as the first coat and then the cationic dispersion is applied, wet-on-wet, or vice versa, that the cationic polyurethane dispersion is used as the primer and the anionic dispersion is used as the top coat without intermediate drying .
• Pre-coat and top coat can each be applied as a compact coat, e.g. according to the air knife method.
• the top coat can be applied as a foam, e.g. with a roller squeegee.
• the foam application gives the textile material thus finished a particularly soft and voluminous handle and a good textile fall.
• the wet layers of anionic and cationic coating are selected in such a range that the finished material has a total dry layer of between 5 and 50 g / m2, preferably between 15 and 35 g / m2 .
• the equipment on the units used in the coating technology is applied in the usual way Temperatures between 80 and 180 ° C, preferably between 120 - 140 ° C, dried and optionally slightly calendered while still warm.
• the invention further relates to the textile fabrics manufactured by the process according to the invention and coated with polyurethane and their use for the production of breathable, water vapor-permeable, but water and wind repellent clothing or technical textiles, such as, for example Tarpaulins, or of leather substitutes.
• the finished textiles can be sanded or sanded afterwards and thus give them a suede-like or suede-like appearance without worsening the other technical properties. In this way it is possible to produce leather substitutes.
• a paste is prepared 100 parts by weight of an aqueous, cationic polyurethane dispersion with a solids content of 30% by weight and a viscosity of 50 mPa.s, prepared by a known process from a polypropylene glycol with a molecular weight of 1000 and a hydroxyl number of 112, from dicyclohexylmethane diisocyanate and N- Methyldiethanolamine as a solubilizing, cationic component and 5 parts by weight of a 50% aqueous solution of a nonionic thickener based on polyurethane (eg BORCHIGEL L 75).
• a 50% aqueous solution of a nonionic thickener based on polyurethane eg BORCHIGEL L 75.
• the paste has a viscosity of 60,000 mPa.s (Brookfield RVT, spindle 6/10 U min ⁇ 1).
• the paste is applied to a commercially available polyester / cotton 66/33 cotton fabric using the air knife method coated with a basis weight of 160 g / m2 and results in a wet coating of 30 g / m2.
• the pre-coated fabric is treated in a second coat with a paste of the following composition: 70 parts by weight of an aqueous, anionic polyurethane dispersion with a solids content of 40% by weight and a viscosity of 300 mPa.s, produced by a known process from a polyether polyol (propylene oxide / ethylene oxide adduct based on glycerol with a molecular weight of 4000) , from isophorone diisocyanate and dimethylolpropionic acid as a solubilizing, anionic component. 1 part by weight defoamer based on Mg stearate, 23 parts by weight of water and 6 parts by weight of thickener (BORCHIGEL L 75).
• the wet coating for the second coat is 40 g / m2.
• the coated fabric is then dried in an air drying cabinet at 90 ° C. for 2 minutes and then subjected to hydrophobization. For this purpose, it is immersed in a float composed of 40 g / l of a fluorocarbon resin emulsion, squeezed onto a 43% wet pad and dried and condensed in a drying cabinet at 170 ° C. for 4 minutes.
• the fabric is then placed on a two-roll calender between a steel and calendered a plastic roller, the temperature of the steel roller 170 ° C, the pressure 150 kg / cm2 linear and the working speed 10 m / min.
• the fabric thus finished has a total dry coating of 21 g / m2 of polyurethane. The measurement results are shown in the table.
• aqueous, anionic polyurethane dispersion is applied as the first coat and an aqueous, cationic polyurethane dispersion as the second coat.
• Pastes of the following composition are used for this:
• an aqueous, anionic polyurethane dispersion with a solids content of 40% by weight and a viscosity of 40 mPa.s prepared by known processes from a linear, hydroxyl-containing polyester based on diethylene glycol and adipic acid with an OH number of 43 , from trimethyl-1, 6-hexamethylene diisocyanate and dimethylolpropionic acid as solubilizing anionic component, 1 part by weight of defoaming agent based on Ca stearate, 18 parts by weight of water 6 parts by weight of a 50% aqueous solution of a non-ionic thickener based on polyurethane (BORCHIGEL L 75).
• the finished fabric has a total dry coating of polyurethane of 17 g / m2 and, after post-hydrophobization according to Example 1, gives the measurement values listed in the table.
• a fabric as described in Example 1 was coated with a spreading paste of the following composition using the air knife method: 80 parts by weight of an aqueous, cationic polyurethane dispersion with a solids content of 30% by weight and a viscosity of 200 mPa.s, prepared by a known method from a Mixture of polyol components from polypropylene glycol with a molecular weight of 1000, trimethylolpropane and ethylene glycol, from dicyclohexylmethane diisocyanate and N-methyldiethanolamine as a solubilizing, cationic component, 2 parts by weight of stearate-based defoaming agent 5 parts by weight of thickener (BORCHIGEL L 75) 13 parts by weight of water
• the wet coating for the primer was 60 g / m2, corresponding to a dry coating of 15 g / m2.
• the fabric coated in this way was dried in a Benz laboratory dryer at 90 ° C. for 2 minutes and then slightly calendered while still warm.
• the fabric prepared in this way was now hydrophobicized and recalendered as in Example 1. It has a total dry surface of 39 g / m2 and has the values listed in the table.
• an aqueous, anionic polyurethane dispersion with a solids content of 40% by weight and a viscosity of 40 mPa.s prepared by known processes from a linear, hydroxyl-containing polyester based on diethylene glycol and adipic acid, with an OH number of 43, from trimethyl-1,6-hexamethylene diisocyanate and dimethylolpropionic acid as solubilizing anionic component, 1 part by weight of defoaming agent based on Ca stearate 18 parts by weight of water 6 parts by weight of a 50% aqueous solution of a nonionic thickener based on polyurethane.
• the wet edition is 25 g / m2. After working up as in Example 1, the total dry coating of polyurethane is 16.5 g / m 2. The measurement results are listed in the table.
• the cleaning is carried out on a B ⁇ WE R8 cleaning system in perchlorethylene with the addition of 2 g / l cleaning booster for 8 min and a reversing run with additional load.
• the humidity above the fleet is 65% rel. Humidity. It is then rinsed in clear perchlorethylene for 3 min, spun and dried.

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

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• 1986
  • 1986-10-04 DE DE19863633874 patent/DE3633874A1/de active Granted
• 1987
  • 1987-09-29 CA CA000548146A patent/CA1301566C/fr not_active Expired - Lifetime
  • 1987-09-29 DE DE8787114169T patent/DE3779300D1/de not_active Expired - Lifetime
  • 1987-09-29 EP EP87114169A patent/EP0283556B1/fr not_active Expired - Lifetime
  • 1987-10-02 US US07/105,944 patent/US4774131A/en not_active Expired - Fee Related
  • 1987-10-02 JP JP62248229A patent/JPS6399376A/ja active Pending

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