Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
  • D06B1/00—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating
  • D06B1/10—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by contact with a member carrying the treating material
  • D06B1/14—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by contact with a member carrying the treating material with a roller
  • D06B1/143—Applying liquids, gases or vapours onto textile materials to effect treatment, e.g. washing, dyeing, bleaching, sizing or impregnating by contact with a member carrying the treating material with a roller where elements are used to mitigate the quantities of treating material on the roller and on the textile material
• • 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
• • 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
  • D06M15/6436—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon in the main chain containing amino groups
• • 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
  • D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
  • D06N3/0095—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by inversion technique; by transfer processes
• • 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
  • D06N3/128—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 silicon polymers
• • 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
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24033—Structurally defined web or sheet [e.g., overall dimension, etc.] including stitching and discrete fastener[s], coating or bond

Definitions

• the general field of the invention is that of the manufacture of textile supports comprising a silicone coating.
• textile supports means fibrous supports, woven, braided, knitted or non-woven.
• the silicone coating is obtained from a silicone composition, in particular a crosslinkable silicone composition, comprising a silicone adhesion promoter system on the surface of the textile, and more particularly those of the two-component or multicomponent type, crosslinkable by reaction reactions. hydrosilylation or polyaddition of the unsaturated groups (alkenyls, e.g., Si-Vi) of a polyorganosiloxane onto hydrogens of the same or another polyorganosiloxane, to produce a thin-film elastomer.
• Other silicone compositions are also suitable, such as those obtained by polycondensation, emulsions or compositions in the solvent phase.
• Another essential object of the present invention is to provide a method of manufacturing a textile support comprising a silicone coating for not damaging said support.
• Another essential objective of the present invention is to provide a method of manufacturing a textile support for using silicone compositions
• Another essential objective of the present invention is to advocate the implementation of such a method for manufacturing a textile support used to form an air bag for the protection of a vehicle occupant.
• the manufacturing method according to the invention makes it possible to obtain a coated support having the same functional performance as the existing coated supports, with a coating having a lower average basis weight and coating speeds that are higher than what is conventionally encountered. with coating systems using a squeegee.
• the polyorganosiloxane (a-1) capable of crosslinking by the action of a catalyst based on at least one organic peroxide is advantageously a product having siloxyl units of formulas:
• R 1 represents a hydrocarbon group having 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms, optionally substituted, and
• R 1 is chosen from:
• cycloalkyl groups for example cyclohexyl, alkenyl groups, for example vinyl, allyl, butenyl and hexenyl groups,
• aryl groups for example phenyl, tolyl or aralkyl groups such as phenylprolyl, and the groups mentioned above in which one or more hydrogen atoms are replaced by one or more halogen atoms, a cyano group or the equivalent of a cyano group such as, for example, a chloromethyl, trifluoropropyl or cyanoethyl group.
• the polyorganosiloxanes (a-1) are terminated at the end of the chain by trimethylsilyl, dimethylvinyl, dimethylhydroxysilyl, trivinylsilyl units.
• organic peroxides useful according to the invention, mention may be made of benzoyl peroxide, bis (p-chlorobenzoyl peroxide), bis (2,4-dichlorobenzoyl) peroxide, dicumyl peroxide and di-t-peroxide.
• the crosslinkable silicone coating composition (A) used comprises polyorganosiloxanes capable of crosslinking by polyaddition reactions.
• a composition is for example described in the international application WO 2005/045123.
• composition (A) comprises a mixture consisting of:
• the polyorganosiloxane POS (I) is one of the essential constituents of the composition (A) for the crosslinking mode by polyaddition reactions.
• it presents units of formula:
• W is an alkenyl group, preferably vinyl
• Z is a monovalent hydrocarbon group, which has no adverse effect on the activity of the catalyst and is selected from alkyl groups having from 1 to 8 carbon atoms inclusive, optionally substituted by at least one halogen atom, and as well as from aryl groups, a is 1 or 2, b is 0, 1 or 2 and a + b is between 1 and 3, and optionally other units of average formula: wherein Z has the same meaning as above and ca a value between 0 and 3.
• Z groups may be the same or different.
• alkenyl is meant an unsaturated hydrocarbon chain, linear or branched, substituted or unsubstituted, having at least one olefinic double bond, and more preferably a single double bond.
• the "alkenyl” group has 2 to 8 carbon atoms, more preferably 2 to 6.
• This hydrocarbon chain optionally comprises at least one heteroatom such as O, N, S.
• alkenyl groups are vinyl, allyl and homoallyl groups; vinyl being particularly preferred.
• Alkyl denotes a saturated, cyclic, linear or branched hydrocarbon-based chain, optionally substituted (eg by one or more alkyls), preferably from 1 to 10 carbon atoms, for example from 1 to 8 carbon atoms, better still 1 to 4 carbon atoms.
• alkyl groups include methyl, ethyl, isopropyl, n-propyl, tert-butyl, isobutyl, n-butyl, n-pentyl, isoamyl and 1,1-dimethylpropyl.
• aryl refers to an aromatic hydrocarbon group having 6 to 18 carbon atoms, monocyclic or polycyclic and preferably monocyclic or bicyclic. It should be understood that, in the context of the invention, a polycyclic aromatic radical is understood to mean a radical having two or more aromatic rings, fused (ortho-condensed or ortho and peri-condensed) to each other, that is to say presenting, two by two, at least two carbons in common.
• the POS (I) has a viscosity of at least 200 mPa.s, preferably at 1000 mPa.s and more preferably between 5000 and 200 000 mPa.s.
• the viscosities indicated correspond to a dynamic viscosity quantity measured at 25 ° C., using a BROOKF1ELD viscometer, according to the AFNOR NFT 76 106 standard of May 1982.
• the POS (I) can be a mixture of several oils meeting the same definition as the POS (I).
• the POS (I) can be formed only of units of formula (1.1) or can contain, in addition, units of formula (1.2).
• the POS (I) is advantageously a linear polymer, whose diorganopolysiloxane chain consists essentially of siloxy units D or D ', and is blocked at each end by a M or M' siloxy unit.
• At least 60% of the Z groups represent methyl radicals.
• Silicon units Q is however not excluded in the proportion of at most 2% (these percentages expressing the number of units T and / or Q for 100 silicon atoms).
• siloxyl units of formula (1.1) are the vinyldimethylsiloxyl, vinylphenylmethylsiloxyl, vinylmethylsiloxyl and vinylsiloxyl units.
• siloxyl units of formula (1.2) are the SiO4 / 2, dimethylsiloxyl, methylphenylsiloxyl, diphenylsiloxyl, methylsiloxyl and phenylsiloxyl units.
• POS (I) examples include dimethylvinylsilyl-terminated dimethylpolysiloxanes, trimethylsilyl-terminated methylvinyldimethylpolysiloxane copolymers, dimethylvinylsilyl-terminated methylvinyldimethylpolysiloxane copolymers, and cyclic methylvinylpolysiloxanes. These POS (I) are marketed by the silicone manufacturers or can be manufactured by operating according to already known techniques.
• the polyorganosiloxane (II) is preferably of the type comprising those containing the siloxyl unit of formula:
• L is a monovalent hydrocarbon group, which has no adverse effect on the activity of the catalyst and is selected from alkyl groups having from 1 to 8 carbon atoms inclusive, optionally substituted by at least one halogen atom, and as well as from aryl groups, d is 1 or 2, e is 0, 1 or 2 and d + ea is 1 to 3; and optionally other siloxyl units of average formula: where L has the same meaning as above and g has a value between 0 and 3.
• the dynamic viscosity of this polyorganosiloxane (II) is at least 10 mPa.s and preferably it is between 20 and 1000 mPa.s.
• the polyorganosiloxane (II) may be formed solely of units of formula (IL1) or may further comprise units of formula (II.2).
• the polyorganosiloxane (II) may have a cyclic or a branched linear structure.
• Group L has the same meaning as group Z above.
• Examples of siloxyl units of formula (IL 1) are:
• siloxyl units of formula (II.2) are the same as those indicated above for the examples of siloxyl units of formula (1.2).
• polyorganosiloxanes (II) are linear and cyclic compounds such as:
• the compound (II) may optionally be a mixture of a dimethylpolysiloxane with hydrogenodimethylsilyl ends and a polyorganosiloxane bearing at least 3 SiH (hydrogenosiloxyl) functional groups.
• the proportions of the polyorganosiloxanes (I) and (II) are such that the molar ratio of the number of silicon-bonded hydrogen atoms in the polyorganosiloxane (II) to the number of silicon-bonded alkenyl radicals in the polyorganosiloxane (I ) is between 0.4 and 10, preferably between 0.6 and 5.
• the polyaddition reaction proper to the crosslinking mechanism of the composition used in the invention is well known to those skilled in the art. It is also possible to use a catalyst (III) in this reaction.
• This catalyst (III) can in particular be chosen from platinum and rhodium compounds.
• platinum complexes and an organic product described in US-A-3 159 601, US-A-3 159 602, US-A-3,220,972 and European patents can be used.
• the weight amount of catalyst (III), calculated as the weight of platinum-metal is generally between 2 and 400 ppm, preferably between 5 and 100 ppm based on the total weight of the POS (I) and (II ).
• adhesion promoter (IV) exclusively comprises:
• - (IV.1) at least one alkoxylated organosilane containing, per molecule, at least one C 2 -C 6 alkenyl group
• - (IV.2) at least one organosilicon compound comprising at least one epoxy radical
• Cg, M being selected from the group consisting of: Ti, Zr, Ge, Li, Mn, Fe, Al, Mg.
• the alkoxylated organosilane is a preferred embodiment of the invention.
• R 1 . R 2 . R 3 are identical to or different from each other and preferably represent hydrogen, linear or branched C 1 -C 4 alkyl or phenyl optionally substituted by at least one C 1 -C 3 alkyl, - A is a linear or branched C 1 -C 4 alkylene,
• - G is a valencial bond or oxygen
• R and R are identical or different radicals and represent a linear or branched C1-C4 alkyl
• vinyltrimethoxysilane may be considered to be a particularly suitable compound (IV.1).
• organosilicon compound (IV.2) it is intended to choose it: - or among the products (IV.2a) corresponding to the following general formula:
• R is a linear or branched C 1 -C 4 alkyl radical
• R is a linear or branched alkyl radical y is 0, 1, 2 or 3,
• R 8 which are identical or different radicals representing hydrogen or a linear or branched C 1 -C 4 alkyl
• R and R or R may alternatively constitute together with the two carbons carrying the epoxy, an alkyl ring having from 5 to 7 members,
• X is the radical as defined above for the formula (IV.2 a)
• G is a monovalent hydrocarbon group, which has no adverse effect on the activity of the catalyst and is preferably chosen from alkyl groups having 1 to 8 carbon atoms inclusive, optionally substituted with at least one halogen atom, advantageously, among methyl, ethyl, propyl and 3,3,3-trifluoropropyl groups and also among aryl groups,
• the Preferred products are those in which the metal M of the chelate and / or alkoxide (IV.3) is selected from the following list: Ti, Zr, Ge, Li, Mn. It should be emphasized that titanium is more particularly preferred. It may be associated, for example, an alkoxy radical of butoxy type.
• the adhesion promoter (IV) may be formed of:
• an advantageous combination for forming the adhesion promoter is as follows: vinyltrimethoxysilane (VTMO), 3-glycidoxypropyltrimethoxysilane (GLYMO) and butyl titanate.
• this ratio is preferably between 2: 1 and 0.5: 1, the ratio 2: 1 being more particularly preferred.
• V filler
• Crosslinking inhibitors (VI) are also well known. They are conventionally chosen from the following compounds:
• alkylated maleates and acetylenic alcohols.
• radicals R, R 'and the carbon atom located alpha of the triple bond may optionally form a ring;
• the total number of carbon atoms contained in R and R ' being at least 5, preferably from 9 to 20.
• Said alcohols are preferably chosen from those having a boiling point greater than 250 ° C. Examples that may be mentioned include: ethynyl-1-cyclohexanol 1; 3-methyl-1-dodecyn-3-ol;
• Such an inhibitor (VI) is present at a maximum of 3000 ppm, preferably at 100 to 1000 ppm relative to the total weight of organopolysiloxanes (I) and (II).
• the silicone phase of the composition may comprise at least one polyorganosiloxane resin (VII), optionally comprising at least one alkenyl residue in its structure, and this resin has a weight content of alkenyl group (s) of between 0.degree. , 1 and 20% by weight and, preferably, between 0.2 and 10% by weight.
• VII polyorganosiloxane resin
• These resins are branched organopolysiloxane oligomers or polymers well known and commercially available. They are preferably in the form of siloxane solutions. They comprise, in their structure, at least two different patterns chosen from the motifs M, D, T and Q, at least one of these patterns being a pattern
• these resins are alkenylated (vinylated).
• examples of oligomers or branched organopolysiloxane polymers that may be mentioned include MQ resins, MDQ resins, TD resins and MDT resins, the alkenyl functions that may be carried by the M, D and / or T units.
• resins which are particularly suitable mention may be made of vinylated MDQ or MQ resins having a weight content of vinyl groups of between 0.2 and 10% by weight, these vinyl groups being borne by the M and / or D units.
• This compound (VII) has the function of increasing the mechanical strength of the silicone elastomer coating and its adhesion, in the context of the coating of the faces of a synthetic fabric (for example polyamide), sewn to form " airbags ".
• This structural resin is advantageously present in a concentration of between 10 and 70% by weight relative to all the constituents of the composition, preferably between 30 and 60% by weight and, more preferably, between 40 and 60% by weight. in weight.
• the polyorganosiloxane resin (VII) will comprise at least 2% by weight of SiO 2 units (Q units), in particular from 4 to 14%, preferably from 5% to 12%.
• additives for improving the fire resistance
• the silicone composition (A) is advantageously presented in the form of an at least two-component system, the mixture of which is capable of rapidly cross-linking under hot conditions by polyaddition.
• the ingredients are then distributed in the different parts according to the rules of those skilled in the art; in particular the catalyst is separated from the component which comprises the hydrogensiloxanes.
• the silicone composition is a crosslinkable composition (B) comprising: B. I - a film-forming silicone network generator system comprising at least one polyorganosiloxane resin (POS) having, per molecule, on the one hand at least two different siloxyl units selected from those of types M, D, T, Q, one of the units being a T unit or a Q unit and, secondly, at least three hydrolysable / condensable groups of OH and / or OR 2 where R 2 is a linear or branched C 1 to C 0 alkyl radical;
• POS polyorganosiloxane resin
• n valence of M
• substituents R 3 which are identical or different, each represent a linear or branched C 1 to C 12 alkyl radical; - a represents zero, 1 or 2;
• the silicone composition used in the invention can crosslink or dry at room temperature, it is preferred to accelerate the crosslinking or the drying by thermal means and / or by electromagnetic radiation (UV or radiation of accelerated electrons or "electron beam” or infra -red), according to step 3 of the method according to the invention.
• the temperature during the crosslinking or drying step is preferably less than 210 ° C., and more preferably still between 90 and 190 ° C.
• the passage time in the ovens is a function of the temperature; this is generally of the order of 10 to 60 seconds at a temperature of the order of 160 to 180 ° C.
• the coating and pressure rollers rotate in co-rotation in the same direction of displacement as the textile support.
• these cylinders can also turn contra-rotation.
• the coating and dosing rolls rotate in co-rotation.
• these cylinders can also turn contra-rotation.
• the speed ratio between the coating cylinder and the metering roll is greater than or equal to 1.2, preferably greater than or equal to 2, and more preferably still greater than or equal to 3.
• the coating head comprises 5 rolls, that is to say a pressure roll, a coating roll, and three measuring rolls, the possible other rolls being measuring rolls, preferably all in co-rotation in the direction of movement of the textile support.
• the metering rollers can significantly shear the silicone composition between said metering rolls and the coating roll. This makes it possible to control the thickness of the silicone film formed on the rolls.
• the cylinders may be metal or covered with rubber, or any other material including ceramics.
• the metering roll and the coating roll may be made of different materials, for example one made of metal and the other covered with rubber.
• the coating machine may comprise two coating heads arranged to coat both sides of the textile support in a single pass.
• the cylinder which is the pressing roll for the coating on the underside of the fabric is also the coating roll for coating on the upper face of the fabric.
• the silicone supply is then double.
• the method according to the invention makes it possible to have a speed of travel of the textile support of between 10 m / min and 500 m / min, and of preferably between 20 m / min and 100 m / min.
• it has at all points a thickness E such that the thickness index
• G (g / m 2 ) more preferably still less than or equal to 1.5, G being the average basis weight of the silicone coating.
• the average grammage G is obtained by dividing the amount of silicone composition (in g) used for the coating by the surface of the substrate to be coated (in m 2 ).
• the coating obtained is in the form of a thin layer of homogeneous thickness, so that the amount of silicone composition necessary to cover the support is less than that necessary to cover the same support using a doctor blade coating machine, without impair its functional performance.
• the support has an average basis weight of the silicone coating less than or equal to 30 g / m 2 , preferably less than or equal to 20 g / m 2 , and more preferably still less than or equal to 15 g / m 2. g / m 2 .
• the air bag for the protection of a vehicle occupant according to the invention is in one piece, consisting of two elements woven in a single step, seamless, called airbag OPW (One Piece Woven ).
• the support is then preferably a polyamide fabric.
• the textile support according to the invention can also be used for the manufacture of technical fabrics such as, in particular, tent fabrics, parachute fabrics and the like.
• the support obtained by the process according to the invention comprising for example a silicone coating of average weight equal to 20 g / m 2 has better functional performance and withstand pressure than a support comprising a silicone coating the same average weight but coated with a squeegee.
• airbags can be produced for the personal protection of the occupants of a vehicle from open-textured fabrics as described above, in particular made of polyamide or polyester fabric which, once coated , have a good resistance to combing and tearing, a weight less than or equal to 200 g / m 2 , and also having optimum properties including impermeability, thermal protection, porosity and pliability. This allows for lighter, more efficient and less expensive airbags than bags made from fabrics coated according to the methods of the prior art.
• the coating in question here may correspond to the deposition of a single layer on at least one of the faces of the flexible support material (primary coating). But it may still be the deposit of a second layer or possibly a third layer on at least one of the faces of the already coated support material (secondary coating) to have the desired thickness in total ensuring the best possible performance in terms of impermeability and favorable touch characteristics.
• compositions and their application as a polyamide fabric coating according to the process of the invention will make it possible to better understand the invention and to highlight its advantages and its variants.
• performance of the products resulting from the process according to the invention will be highlighted by comparative tests.
• FIG. 5 is an observation photograph of a surface scanning electron microscope (magnification ⁇ 50) view of a fabric obtained according to example 2.
• Figure 6 is an observation photograph of a scanning electron microscope sectional view (magnification ⁇ 100) of a tissue obtained according to Example 3.
• Figure 7 is an observation photograph of a scanning electron microscope sectional view (magnification ⁇ 100) of a fabric obtained according to Example 4.
• Figures 9 and 10 are photographs of observation of a sectional view under a scanning electron microscope (magnification ⁇ 100 and ⁇ 200) of a fabric obtained according to Example 5.
• the coated weight is measured by differential weighing between a coated sample and an uncoated sample, preferably a precursor of the fabric before the coated area.
• the measures of resistance to combing are carried out according to the indications of the standard ASTM D 6479.
• Test of resistance to crumpling and abrasion (test "scrub") (standard ISO 5981 A). This test reflects the adhesion and aging resistance of the composition. This test involves subjecting the fabric, on the one hand, to a shearing movement by means of two jaws pinching the two opposite edges of a test-tube and moving in an alternating motion relative to each other and, on the other hand, abrasion by contact with a movable support.
• the apparatus consists of two chambers of known volume.
• the test consists of filling the first chamber with a pressurized gas, in this case air, and sealing by closing the inlet valve.
• a sample of coated fabric is mounted on a hollow plate, coated side facing the two "e chamber, meanwhile filled with ambient air.
• a solenoid valve is triggered to put in communication the chamber and the st 2 nd chamber, so as to abruptly applying an overpressure on the coated support.
• This pressure is 100 kPa.
• the pressure in the chamber is then measured as a function of time. In general, we look at the time required for the pressure to fall to 50 kPa (loss of
• FIG. 1 is a schematic representation of a transfer coating head with a pressing roll 1 driving the fabric 4, a coating roll 2 and a measuring element 3. Only the coating roll 2 and the pressing roll 1 are in contact with the tissue 4. The supply of the silicone 5 is done by the metering element 3.
• This metering element 3 can be a doctor blade, an extruder, a nozzle, a slot, another cylinder, or any other element making it possible to form a film
• the coating roll 2 can rotate in co-rotation with respect to the pressing roll 1 and the fabric 4 (direction 7).
• the coating roll 2 can also rotate contra-rotation relative to the pressing roll 1 and the fabric 4 (direction 6). In this case, the silicone feed will be side 5b.
• the machine does not include any squeegee in contact with the fabric 4.
• the resulting composition is then applied to a continuous synthetic yarn fabric polyamide 6.6 title 470 decitex (dtex) and having a texture of 18 x 18 son / cm.
• This application is carried out by transfer coating using a pilot coating machine, the coating head comprises 5 cylinders in accordance with Figure 2: A metal cylinder 1 rotating dosing 10% of the speed of the fabric, a 2 n rubber metering roll 16% rotating speed of the fabric, a 3 'th cylinder metal doser rotating at 50% of the speed of the fabric, 110% rotating rubber coating roll to the speed of the fabric, and pressed on the metering cylinder by a pressure of 15 bars, and a metal press cylinder taking the fabric to 50 m / min. The contact of the pressure roller on the casting roll leaves a 16 mm impression on the fabric.
• the weight deposited is 22 g / m 2 .
• Step 3 is similar to that of Example 1.
• FIG. 6 shows that the coating is uniformly distributed, of constant thickness and follows the non-planar shape of the fabric.
• the coating matches the relief of the filaments and forms a continuous layer of silicone.
• the appearance of the surface is smooth. There are no damaged wires. The tops of the wires are effectively protected and there is no build-up of silicone between the wires.
• the adhesion scrub after an annealing of 30 s at 180 0 C is greater than 600 creases.
• Step 3 is similar to that of Example 1.
• a support of homogeneous appearance without defect or visible roughness is obtained, the covering of the fabric by the coating appearing continuous.
• Figures 7 and 8 show that the coating is uniformly distributed, of constant thickness and follows the non-planar shape of the fabric. The coating matches the relief of the filaments and forms a continuous layer of silicone.
• the scrub adhesion after an annealing of 20 s at 180 ° C. is greater than 1200 creases.
• the result of the dynamic permeability test is 15 s.
• a liquid silicone elastomer based on a mixture of 67.8: 31.8 and 0.4% by weight of TCS 7512A: TCS 7511 C: TCS 75 HD sold by Bluestar Silicones is used. It is a vulcanizable elastomer of polyaddition.
• a composition having a dynamic viscosity of 16,000 mPa.s. 2 The resulting composition is then applied to a continuous synthetic yarn fabric polyamide 6.6 title 470 decitex (dtex) and having a texture of 18 x 18 son / cm.
• the coating head comprises 3 cylinders according to Figure 3: a metering cylinder rotating at 60% of the speed of the fabric, a cylinder metal coating rotating at 105% of the speed of the fabric, and pressed on the metering roll by a pressure of 15 bar via a wedge of 100 microns, and a rubber pressure roller taking the fabric to 20 m / min.
• the contact of the pressure roller on the casting roll leaves a 16 mm impression on the fabric.
• the weight deposited is 21 g / m 2 .
• Step 3 is similar to that of Example 1.
• the adhesion scrub after an annealing of 30 s at 180 0 C is greater than 1000 creases.
• TCS 7512A TCS 751 ID marketed by Bluestar Silicones. It is a vulcanizable elastomer of polyaddition.
• composition having a dynamic viscosity of 30,800 mPa.s. 2 The resulting composition is then applied to a continuous synthetic yarn fabric polyamide 6.6 title 470 decitex (dtex) and having a texture of 16 x 16 son / cm.
• the weight deposited is 27 g / m 2 .
• the adhesion scrub after an annealing of 30 s at 180 0 C is greater than 1000 creases.
• the tear is 330 ⁇ 13 N (240 ⁇ 10 N for the tissue alone) and the combing is 353 ⁇ 11 N (58 ⁇ 10 N for the tissue alone), ie a 35% tearing gain and 500% tearing. combing.
• a liquid silicone elastomer based on a mixture 99.3: 0.7% by mass of TCS 751 IA: TCS 751 ID marketed by Bluestar Silicones is used. It is a vulcanizable elastomer of polyaddition.
• the resulting composition is then applied to a continuous synthetic yarn fabric polyamide 6.6 title 470 decitex (dtex) and having a texture of 16 x 16 son / cm.
• This application is done by transfer coating by means of a pilot coating machine, the coating head comprises 3 cylinders according to Figure 3: a metering cylinder rotating at 60% of the speed of the fabric, a cylinder metal coating rotating at 105% of the speed of the fabric, and pressed on the metering roll by a pressure of 15 bar via a wedge of 100 microns, and a rubber pressure roller taking the fabric to 20 m / min.
• the contact of the pressure roller on the casting roll leaves a 14 mm impression on the fabric.
• the weight deposited is 27 g / m 2 .
• Step 3 is similar to that of Example 1.
• the tear is 349 ⁇ 5 N (240 ⁇ 10 N for the tissue alone) and the combing is 240 ⁇ 22
• the resulting composition is then applied to a nylon 6,6 filament yarn of title 470 dtex and 18x18 thread count / cm.
• the crosslinkable elastomer is applied to a 3-cylinder head according to FIG. 3, with a fixed metal metering roll, a rubber roll of hardness 80 shore A, pressed on the metering roll by a pressure of 15 bar, and rotating at 105 ° C. % of the fabric speed, and a metal press roll taking the fabric to 20 m / min.
• the contact of the pressure roller on the casting cylinder leaves a 7 mm impression on the fabric.
• the weight deposited is 16 g / m 2 .
• Step 3 is similar to that of Example 1.
• a support of homogeneous appearance is obtained, without defect or visible asperity, the cover of the fabric revealed by the blue coloration of the coating appearing continuous.
• the scrub adhesion is greater than 600 wrinkles.
• the tear is 378 ⁇ 14 N (217 + 6 N for the fabric alone) and the combing is 343 ⁇ 17 N (312 ⁇ 28 N for the fabric alone), a 75% gain in tearing.
• the result of the dynamic permeability test is 3 s.
• the crosslinkable elastomer is applied to a 3-cylinder head according to FIG. 3, with a metal metering roll rotating at 80% of the fabric speed, a metal coating roll rotating at 120% of the fabric speed, supported on the metering roll at a pressure of 15 bar, and a metal press roll taking the fabric to 20 m / min.
• the spacing between the coating roll and the pressure roll corresponds to a 7 mm footprint on a flat fabric as in Example 7.
• the weight deposited is 45 g / m 2 on the 1st and 2nd sides .
• Step 3 is similar to that of Example 1.
• a support of homogeneous appearance without visible defects or roughness is obtained, in particular at the transition zones which appear covered, as revealed by the red coloration of the coating.
• the adhesion scrub is greater than 2000 creases
• the tear is 345 ⁇ 15 N (210 ⁇ 10 N for the tissue alone) and the comb is 660 ⁇ 70 N (660 ⁇ 70 N for the tissue alone), ie a tear increase of 65%.
• the method according to the invention therefore makes it possible to reduce the quantity of silicone used without compromising on the functional performances or on the tightness of the support. This process is therefore particularly profitable from an economic point of view. It also allows the use of cheaper media, ensuring in spite of all the functional properties sought.
• the method according to the invention also makes it possible to increase the tightness of the coated textile support while using little silicone.

Applications Claiming Priority (2)

Publications (1)

Family

ID=38481547

Family Applications (1)

Country Status (7)

Families Citing this family (8)

Family Cites Families (10)

• 2007
  • 2007-03-02 FR FR0701553A patent/FR2913239A1/fr active Pending
• 2008
  • 2008-02-29 WO PCT/EP2008/052527 patent/WO2008107407A1/fr active Application Filing
  • 2008-02-29 US US12/529,603 patent/US20110018234A1/en not_active Abandoned
  • 2008-02-29 KR KR1020097020722A patent/KR20090116825A/ko not_active Application Discontinuation
  • 2008-02-29 JP JP2009552184A patent/JP2010520052A/ja active Pending
  • 2008-02-29 CN CN200880011976A patent/CN101657578A/zh active Pending
  • 2008-02-29 EP EP08709265A patent/EP2126180A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events