Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4326—Condensation or reaction polymers
  • D04H1/435—Polyesters
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
  • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
  • D04H1/4326—Condensation or reaction polymers
  • D04H1/4358—Polyurethanes
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
  • D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
  • D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
  • D04H1/724—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged forming webs during fibre formation, e.g. flash-spinning
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/005—Synthetic yarns or filaments
  • D04H3/009—Condensation or reaction polymers
• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
  • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
  • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion

Definitions

• the present invention relates to a process for the production of carrier-free and release agent-free, thermally activatable nonwovens based on hydroxyl polyester polyurethanes, and to the use thereof for bonding different substrates.
• thermo-activatable films based on hydroxyl polyester polyurethanes are their low gas permeability and their hardening of the handle, which is particularly important when gluing textiles, as well as the relatively high weight per unit area, which is a higher material costs.
• thermo-activatable films based on hydroxyl polyester polyurethanes is therefore important for technical applications, e.g. Laminating parts for the automotive interior, limited.
• a larger and closed-area adhesive application is necessary for some composite structures, e.g. To absorb the restoring forces of deep-drawn soft PVC films, there are sufficient fields of application where it is possible to work with less adhesive and a closed film-like surface structure of the applied adhesive is only a disadvantage.
• the films which can be thermally activated and are used to bond various substrates can be produced by a wide variety of processes.
• thermoplastic elastomers e.g. Polyurethanes
• monofilm blown film extrusion process The production of foils from thermoplastic elastomers, e.g. Polyurethanes, using the monofilm blown film extrusion process.
• an internal release agent or spacer must be added to the relatively strong adhesive thermoplastics before blowing the film tube, otherwise the film webs will stick to one another after being laid flat by means of a squeeze roller and subsequently can no longer be separated.
• the object of the present invention was therefore to avoid the disadvantages mentioned when using solvent-containing adhesives and also when using solvent-free adhesives, such as films.
• Some of the disadvantages mentioned can be avoided by using thermo-activatable nonwovens when bonding various substrates, in particular if the meltblown method (eg: REICOFIL® melt-blown method) is used to produce the nonwovens.
• the invention therefore relates to a process for the production of carrier and release agent-free, thermally activatable nonwovens based on hydroxyl polyester polyurethanes with viscosities from 600 to 3500 mPa.s, measured as solution viscosity in methyl ethyl ketone (15%) and with basis weights in the range from 5 to 200 g / m2, characterized in that the nonwovens are formed by means of a melt-blowing process (eg REICOFIL® melt-blown process) at melt temperatures of 230 to 260 ° C, using a storage belt, the material of which has a surface tension of 18 , 5 x 10 ⁇ 5 N / cm to 46 x 10 ⁇ 5 N / cm.
• a melt-blowing process eg REICOFIL® melt-blown process
• the invention furthermore relates to the use of the nonwovens produced in the above manner for gluing or coating different substrates.
• the carrier-free and release agent-free, thermo-activatable nonwovens produced by the process according to the invention preferably have basis weights in the range from 8 to 50, very particularly preferably 10 to 30 g / m 2.
• the basis weights of the nonwovens depend on the substrates used in the bonding and, depending on requirements, can also contain higher basis weights, especially if unevenness has to be compensated for during the bonding.
• the raw materials based on hydroxyl polyester polyurethanes used in the process according to the invention preferably have a viscosity of 1500 to 2100 mPa.s, measured as solution viscosity (15%) in methyl ethyl ketone (Brookfield LVT viscometer, spindle 3, 60 rpm at 23 ° C.).
• Particularly suitable hydroxyl polyester polyurethanes are those which, by reacting organic isocyanates with preferably difunctional, alcoholic hydroxyl groups containing polyester polyols and low molecular weight diols as chain extenders while maintaining an NCO / OH equivalent ratio from 0.9: 1 to 0.999: 1 are available, as described in EP 0 158 086 and DE-PS 1 256 822, DE-PS 2 161 340, DE-PS 3 502 379.
• Suitable dihydroxy polyesters are in particular those of a molecular weight above 600, preferably between 1200 and 6000, particularly preferably between 2000 and 4000 g / mol, as are known in a known manner from alkanedicarboxylic acids with preferably 6 carbon atoms and alkanediols with preferably at least 4 carbon atoms.
• Suitable dicarboxylic acids are, for example, adipic acid, sebacic acid, pimilic acid, suberic acid, azelaic acid, sebacic acid.
• Suitable alkanediols are, for example, 1,4-butanediol, 1,5-pentanediol, or 1,6-hexanediol.
• the chain extenders are in particular diols or diol mixtures in the molecular weight range 62 to 300, preferably 62 to 150 g / mol.
• Suitable such diols are e.g. Alkanediols preferably having 4 to 6 carbon atoms, such as 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol.
• diisocyanates examples include 1,6-diisocyanatohexane, 1,4-diisocyanatocyclohexane, 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethylcyclohexane, methylenebis (4-isocyanatocyclohexane), 2,4- and optionally 2, 6-diisoocyanatotoluene, 4,4'-diisocyanatodiphenylmethane, 4,4'-diisocyanatodiphenylpropane-2,2 or any mixture of such isocyanates.
• 4,4'-Diisocyanatodiphenylmethane is particularly preferred as the reaction component.
• the nonwovens according to the invention are produced by the melt-blow method, in particular melt temperatures (measured in front of the spinning nozzles) of 230 to 260 ° C. being used.
• the melt-blowing process is described in more detail in DE-OS 19 64 060 and in DE-OS 23 08 242 and essentially consists of a specially designed shaping tool for polymer threads connected downstream of an extruder, the main feature of which is therein there is that a directed, heated air flow can be assigned to each individual nozzle, which ensures that the emerging polymer threads are stretched up and torn off in a controlled manner.
• the hot air can be brought to the polymer melt from slits that are tight on two sides or flow around the polymer melt from an annular hole around the inner melt hole.
• the spun threads are deposited on a moving pick-up device, e.g. a rotating conveyor belt.
• a storage belt is used, the material of which has a surface tension of preferably 18.5 x 10 ⁇ 5 to 33 x 10 ⁇ 5 N / cm. Teflon-coated textile fabrics, for example, are suitable as materials for the storage belt.
• a wide variety of methods can be used to bond the substrates to the nonwoven produced by the method according to the invention.
• the vacuum deep-drawing process, deep-drawing presses, vacuum deep-drawing presses are used to produce molded parts for headliners, side cladding elements or foam-backable composites for seat manufacture etc.
• a large number of substrates can be bonded to themselves or to one another with the nonwoven fabric produced by the method according to the invention.
• a wide variety of textile fabrics based on cotton, cotton blended fabrics, wool, wool blended fabrics, polyester and polyamide fabrics and polyolefins are particularly worth mentioning.
• hydroxyl polyester polyurethanes can be processed to nonwovens by a melt-blow process, since it had to be expected that at the high melt temperatures required for the melt-blow process and which would be about 50 ° C. above the temperatures of the usual film production processes, there is such a large shift in equilibrium in favor of the starting components in hydroxyl polyester polyurethanes that at most oligomeric products are obtained which can no longer be consolidated into a nonwoven.
• a limited number of raw materials are known in the prior art, which can be formed into nonwovens by means of the melt-blowing technique.
• these are polymers that solidify completely amorphously or partially crystalline, such as polypropylene and polystyrene.
• These polymers generally have the property of having a completely tack-free surface immediately after the temperature drops below about 70 ° C.
• Hydroxylpolyesterpolyurethane with segmented structure of soft and Hard segments are more critical in this regard. In order to recrystallize the hydroxyl polyester polyurethane processed in the extrusion process, a much longer time is required in comparison to the abovementioned polymers, and in any case the temperature in the molded extrudate is below 50 ° C. This behavior of segmented polyester urethanes generally leads to the disadvantages mentioned of the non-release or spacer-free production and the blocking of these extrudates on the roll.
• the hydroxyl polyester polyurethanes deposited as tangled fibers have a tack-free surface shortly after being deposited on the conveyor belt of the melt-blown system, so that the melt-blown spunbonded fabric obtained can subsequently be fed directly to a winder. Blocking on the winder no longer occurs subsequently.
• the fleece obtained Due to the low fiber titer (approx. 0.1 dtex), the fleece obtained is characterized by a large surface coverage (opacity) even with small application quantities. With, for textile applications, even high application quantities of 30 g / m2, a soft feel is retained. Depending on the order volume, air permeability can be set specifically.
• thermoplastic elastomeric hydroxyl polyester polyurethanes were predried in a SOMOS® air dryer over a period of 12 hours.
• the extruder and mold temperatures were set so that a melt temperature of 250 ° C was achieved in front of the unloading nozzles.
• the hydroxyl polyester polyurethane solution viscosity: 2000 mPa.s
• the spinning pump output was increased to 4 rpm. set.
• the resulting extrusion rate was 22 kg / h.
• a melt pressure of the extruder / nozzle of 40/16 bar is established.
• the polymer threads emerging from the melt nozzles were placed after stretching by the compressed air preheated to 220 ° C.
• the extruder and mold temperatures were set so that a melt temperature of 250 ° C was achieved in front of the unloading nozzles. With a screw speed of 5 rpm. the hydroxyl polyester polyurethane (solution viscosity: 1200 mPa.s) extruded. The spinning pump output was increased to 4 rpm. set. The resulting extrusion rate was 22 kg / h. A melt pressure of the extruder / nozzle of 40/30 bar is established.
• the polymer threads emerging from the melt nozzles were placed on a circulating conveyor belt with a surface tension of 30 ⁇ 10 ⁇ 5 N / cm after stretching through the compressed air preheated to 220 ° C and the controlled thread break-off and fed from there to an intermediate take-off where the edge trimming took place .
• the fleece was then wound onto 1000 mm cardboard cores. Different basis weights were set by changing the spinning belt speed and / or the throughput. 200 running meters were wound up per attempt. The processing of the cardboard core could be carried out at any time without any problems.
• the hydroxyl polyester polyurethane was applied as a fleece directly to a TPU surface film (thickness 100 ⁇ m).
• a TPU surface film thickness 100 ⁇ m.
• it was wound up on 1000 mm cardboard tubes. The process was easily carried out at all times.
• Example 3 The procedure was analogous to that in Example 3 with a soft PVC (foam) film web.
• the adhesion of the melt-blown spunbond made of the hydroxyl polyester polyurethane was sufficient to ensure that the coated web could be wound up and unwound easily.
• Example 3 Analogously to Example 3, the hydroxyl polyester polyurethane was applied directly to a cotton fabric as a fleece. The adhesion of the fleece to the textile web was excellent here too. Bonding this fabric, coated with different amounts of material, to an uncoated cotton fabric provided the peel strengths listed in Table 1 below.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Laminated Bodies (AREA)
• Nonwoven Fabrics (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Adhesive Tapes (AREA)
• Paints Or Removers (AREA)
• Artificial Filaments (AREA)
• Polyurethanes Or Polyureas (AREA)
• Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (2)

Citations (8)

• 1993
  • 1993-06-07 DE DE4318887A patent/DE4318887A1/de not_active Withdrawn
• 1994
  • 1994-05-25 ES ES94108039T patent/ES2136140T3/es not_active Expired - Lifetime
  • 1994-05-25 DE DE59408568T patent/DE59408568D1/de not_active Expired - Fee Related
  • 1994-05-25 EP EP94108039A patent/EP0628650B1/fr not_active Expired - Lifetime
  • 1994-06-01 JP JP6140693A patent/JPH07310270A/ja active Pending
  • 1994-06-03 CA CA002125076A patent/CA2125076A1/fr not_active Abandoned

Patent Citations (8)

Non-Patent Citations (4)

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