EP2004864B1 - Expansion sans pression au moyen d'ir - Google Patents

Expansion sans pression au moyen d'ir Download PDF

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Publication number
EP2004864B1
EP2004864B1 EP07723626A EP07723626A EP2004864B1 EP 2004864 B1 EP2004864 B1 EP 2004864B1 EP 07723626 A EP07723626 A EP 07723626A EP 07723626 A EP07723626 A EP 07723626A EP 2004864 B1 EP2004864 B1 EP 2004864B1
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EP
European Patent Office
Prior art keywords
leather
plastic dispersion
compact particles
hollow microspheres
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP07723626A
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German (de)
English (en)
Other versions
EP2004864A1 (fr
Inventor
Philipp Schäfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lanxess Deutschland GmbH
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Lanxess Deutschland GmbH
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Publication date
Application filed by Lanxess Deutschland GmbH filed Critical Lanxess Deutschland GmbH
Priority to PL07723626T priority Critical patent/PL2004864T3/pl
Publication of EP2004864A1 publication Critical patent/EP2004864A1/fr
Application granted granted Critical
Publication of EP2004864B1 publication Critical patent/EP2004864B1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C11/00—Surface finishing of leather
    • C14C11/003—Surface finishing of leather using macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C13/00—Manufacture of special kinds or leather, e.g. vellum
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C15/00—Apparatus for chemical treatment or washing of hides, skins, or leather
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
    • C14C9/04—Fixing tanning agents in the leather

Definitions

  • the invention relates to a method for applying a coating, preferably a base coat, to the grain side of a leather, in particular a cowhide, wherein an aqueous, containing a blowing agent containing compact particles plastic dispersion is applied to this grain side and solidify and by supplying heat from the compact particles Micro hollow balls are formed.
  • a leather and a method for producing the same have become known in which the rear side of the leather opposite the visible side is provided with foam equipment which is formed by solidifying a liquid-applied, finished hollow microspheres-containing plastic material by the brief action of hot air.
  • the hot air in this case has a temperature of more than 280 ° C, preferably a temperature between 350 ° C and 650 ° C, is thus very hot and dry, which causes the leather, the natural moisture is removed, and that it shrinks and hardens.
  • the hollow microspheres in the uppermost area of the foam equipment are often destroyed.
  • this coating can not be used as a base coat for the construction of further finishing finishes.
  • the DE 20318311 U1 discloses a full-grain leather in which imperfections in the scar layer are corrected by a plastic filling compound consisting of a solidified, from Compact particles by heat supply formed hollow microspheres containing plastic dispersion consists.
  • the formation of the hollow microspheres is carried out by applying pressure and heat at a temperature of at least 100 ° C.
  • this known design has the disadvantage that the leather is adversely affected at the required pressure and the applied temperature.
  • the defects formed by depressions are not completely filled by the plastic filling compound, as after pressure relief, the pressure-elastic leather resets, whereas the plastic filling mass does not increase in volume, and thus the Kunststofffiillmasse is still set back on its upper side against the leather surface.
  • the grain layer of the leather must be ground so deep until the entire surface is flat, whereby the quality of the leather is impaired and this significantly decreases in value.
  • the temperature increase required for expanding the compact particles to form the hollow microspheres does not take place with economically justifiable application of pressure and heat, so that this lower region has no or only a small number of hollow microspheres. If higher temperatures are used over a relatively long period of time, although hollow microspheres form in this region, the leather is even more compacted, which leads to further hardening.
  • the dermis especially in the abdominal area of a cow's skin, the looseness again fully.
  • plastic dispersion is applied.
  • the application takes place here in thin layers between 0.015 mm and 0.08 mm, either via rollers that rotate in the opposite direction to the transport direction of the leather, or preferably by spraying, because then the thin plastic dispersion better even in fine depressions from the leather surface starting deep in the leather penetrates.
  • the application can also be done manually, e.g. by the so-called plush.
  • the object of the present invention is to avoid the disadvantages of the known foam-coated leather and to provide a leather, in particular a cowhide, which has a foam coating on its grain side, which can be produced in an economical manner, in which Shrinkage and hardening in the formation of the foam coating is avoided and in which defects on the top of the leather can be eliminated without any existing grain structure is damaged by reworking the top.
  • the heat supply to form the hollow microspheres from the compact particles is effected by the compacted particles containing solidified plastic dispersion of infrared radiation having a wavelength between 0.7 .mu.m and 100 .mu.m is suspended.
  • the compact particles containing solidified plastic dispersion of infrared dark radiation having a wavelength between 2 microns and 10 microns is exposed, since in this case a deep penetration of the heat is ensured in the leather and therefore a uniform heating of the solidified plastic dispersion to form the hollow microspheres is ensured in all areas within a short time. It is sufficient if, according to the invention, the compact particles containing, solidified plastic dispersion during a period of less than 30 sec, preferably less than 20 sec, is exposed to infrared radiation.
  • thermoplastic and / or thermoelastic plastic dispersions which contain a propellant having compact particles.
  • These compact particles consist in a known manner of a thermoplastic or plastic copolymer, preferably of polyvinylidene chloride copolymer, containing as propellant, for example, isobutane, and have a size of less than 20 microns, preferably less than 10 microns.
  • propellant for example, isobutane
  • a plastic dispersion which preferably contains a wetting agent and / or density-increasing additives, such as barite, they penetrate easily into the depressions on the leather surface.
  • soft plastic dispersions having a hardness of less than 70 Shore A.
  • the preferred viscosity of the plastic dispersion is, especially when it penetrates with a spray device or by so-called plush, in which the low-viscosity plastic dispersion penetrates particularly deep into the finest wells on the leather is applied, in the range between 5 sec and 15 sec, measured in a Ford cup with a nozzle diameter of 6 mm. If the plastic dispersion is applied to it by means of a roller rotating in opposite directions to the direction of transport of the leather in order to assist penetration of the plastic dispersion into the depressions on the leather surface, the viscosity is between 10 and 40 sec measured in a Ford cup with a diameter of 6 mm.
  • a device for applying a coating, preferably a base coat, to the grain side of a leather comprising a known application device for Application of an aqueous, compact particle containing plastic dispersion containing a blowing agent on the grain side of the leather and a solidifying the plastic dispersion causing heat source, characterized in that an infrared radiator is provided with directed against the solidified plastic dispersion beam surface, the infrared rays having a wavelength between 0, 7 microns and 10 microns emitted.
  • an infrared dimmer is provided, the beam surface emits infrared rays with a wavelength between 2 microns and 10 microns.
  • the jet surface of the infrared radiator is provided at a distance from the surface of the solidified plastic dispersion between 45 mm and 220 mm.
  • a continuous production process is achieved in that the infrared radiator is arranged above a circulating transport device supporting the leather with the solidified plastic dispersion so that the formation of the hollow microspheres takes place in the solidified plastic dispersion while the leather passes through the transport device under the jet surface of the infrared radiator.
  • the transport device expediently consists of a plurality of spaced, parallel, circumferential plastic threads, such as polyamide or polyester threads. Such plastic threads are not heated as much by the infrared rays as the leather, which contains moisture, so that they endure the temperature caused by the infrared radiation as a continuous load.
  • the infrared radiator is designed as a surface radiator, so that the moving means of the transport device below the infrared radiator leather is extensively exposed to the infrared radiation.
  • the infrared radiator seen in the direction of transport of the leather, is provided for a traversed by the leather drying tunnel, so that the applied to the leather plastic dispersion after passing through the drying tunnel is not only anhydrous and therefore solidified, but the leather and the solidified plastic dispersion in the presence of infrared radiation already a temperature between 65 ° C and 80 ° C. exhibit.
  • the heating by means of infrared radiation at a temperature of 105 ° C in less than 12 sec.
  • a drying tunnel is also provided behind the infrared radiator, in which drying of the leather provided with the foam coating takes place.
  • the leather produced with the device described above is characterized in that the infrared radiation-treated coating has on its surface a homogeneous, nubuck-like, recess-free appearance, such as finely grained grain leather, even having a slight nubuck typical writing action, and microscopically has finest pores with an inner diameter of less than 35 microns.
  • the closed pores are close to each other and consist of well-formed hollow microspheres, whose shells are viewed under the microscope at 25x magnification, the color of the coating in color transparent form. If, for example, the coating is blue, then the shells of the hollow microspheres are transparent blue.
  • the coating of such a leather pigments and / or a silicone emulsion preferably a silicone dispersion having a solids content of more than 2 wt.%, Based on the solidified plastic dispersion and a crosslinking agent.
  • an additional finish layer can be omitted.
  • Such a leather despite its softness is not or almost not losnarbig.
  • this leather has an optimum appearance because when compressed, many small wrinkles appear which have the appearance of high-grade full-grain aniline leather. Due to the nubuck-like appearance of the surface of the base coat, a subsequently applied finish coat can also be mechanically anchored.
  • the coating of the leather can be treated after formation of the hollow microspheres on the surface with very fine sandpaper so that only the foam structure having a coating, but not the natural grain layer is removed.
  • such a leather is particularly suitable for the production of automotive components, in which the leather is drawn into molds and optionally backfoamed.
  • Fig. 1 shows the principle of the device described above and Fig. 2 schematically represents an embodiment of this device.
  • a leather 3 On a circulating in the transport direction 1 transport device 2, a leather 3 is supported, in an unspecified, known manner, for example by spraying or by roller application, preferably by a counter-rotating to the transport direction 1 applicator roll, an aqueous, compact particles containing plastic dispersion 4 was applied, which was solidified by heat, for example by means of hot air.
  • the transport device 2 consists expediently of a plurality of spaced, parallel polyamide or polyester threads, between which spaces are kept free. These threads are shown enlarged in the drawing. In practice, its diameter is less than 4 mm.
  • an infrared radiator 5 is provided, from whose planar radiating surface 6 infrared radiation with a wavelength between 0.7 ⁇ m and 100 ⁇ m emerges in the direction of the solidified plastic dispersion 4.
  • an infrared radiator 5 is provided, from whose planar radiating surface 6 infrared radiation with a wavelength between 0.7 ⁇ m and 100 ⁇ m emerges in the direction of the solidified plastic dispersion 4.
  • the hollow microspheres 7 are shown for better visibility because of enlarged.
  • the distance a between the radiation surface 6 and the top of the solidified plastic dispersion 4 is between 45 mm and 220 mm and is chosen so that the formation of the hollow microspheres 7 is ensured within a period of less than 30 sec.
  • a hot air duct 9 is provided, in which over the spaces between the polyamide or polyester threads and the underside of the leather 3 warm air can be supplied.

Abstract

L'invention concerne un procédé d'application d'un revêtement, de préférence un revêtement de base, sur le côté fleur d'un cuir, en particulier d'un cuir de boeuf, procédé dans lequel une dispersion plastique aqueuse (4) comprenant des particules compactes contenant un propulseur est appliquée sur ledit côté fleur, et rendu adhérente, cependant qu'il se forme par apport de chaleur, des sphères creuses microscopiques (7) à partir des particules compactes. L'invention est caractérisée en ce que la dispersion plastique adhérente, contenant les particules compactes (4) est exposée à un rayonnement infrarouge de longueur d'onde comprise entre 0,7 μm et 100 μm.

Claims (5)

  1. Procédé pour appliquer un revêtement, de préférence un apprêt, sur le côté fleur d'un cuir, en particulier d'un cuir de boeuf, où une dispersion de matériau synthétique (4) aqueuse, contenant un agent gonflant, présentant des particules compactes est appliquée sur ce côté fleur et on la laisse se solidifier et, par alimentation de chaleur, des microbilles (7) sont formées à partir des particules compactes, caractérisé en ce que la dispersion de matériau synthétique (4) solidifiée, contenant les particules compactes est exposée à un rayonnement infrarouge d'une longueur d'onde entre 0,7 µm et 100 µm.
  2. Procédé selon la revendication 1, caractérisé en ce que la dispersion de matériau synthétique (4) solidifiée, contenant les particules compactes est exposée à un rayonnement infrarouge foncé d'une longueur d'onde entre 2 µm et 10 µm.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la dispersion de matériau synthétique (4) solidifiée, contenant les particules compactes est exposée à un rayonnement infrarouge pendant un laps de temps inférieur à 30 secondes, de préférence inférieur à 20 secondes.
  4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que la dispersion de matériau synthétique (4) solidifiée, contenant les particules compactes est chauffée au moyen d'un rayonnement infrarouge à une température entre 90°C et 115°C.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'une dispersion de matériau synthétique (4) solidifiée, qui ne contient plus de quantité notable d'eau, est exposée à un rayonnement infrarouge d'une longueur d'onde entre 0,7 µm et 100 µm, le revêtement formé par la dispersion étant en particulier solidifié par les particules compactes.
EP07723626A 2006-04-05 2007-03-27 Expansion sans pression au moyen d'ir Active EP2004864B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07723626T PL2004864T3 (pl) 2006-04-05 2007-03-27 Bezciśnieniowa ekspansja za pomocą IR

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0026706U AT8680U1 (de) 2006-04-05 2006-04-05 Verfahren und vorrichtung zum aufbringen einer beschichtung auf die narbenseite eines leders
PCT/EP2007/002680 WO2007115680A1 (fr) 2006-04-05 2007-03-27 Expansion sans pression au moyen d'ir

Publications (2)

Publication Number Publication Date
EP2004864A1 EP2004864A1 (fr) 2008-12-24
EP2004864B1 true EP2004864B1 (fr) 2010-11-17

Family

ID=41128124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07723626A Active EP2004864B1 (fr) 2006-04-05 2007-03-27 Expansion sans pression au moyen d'ir

Country Status (11)

Country Link
EP (1) EP2004864B1 (fr)
KR (1) KR101437697B1 (fr)
CN (2) CN102787184A (fr)
AR (1) AR060298A1 (fr)
AT (2) AT8680U1 (fr)
DE (2) DE202006016363U1 (fr)
MX (1) MX2008012667A (fr)
NO (1) NO20084417L (fr)
PL (1) PL2004864T3 (fr)
WO (1) WO2007115680A1 (fr)
ZA (1) ZA200808048B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150276311A1 (en) * 2012-09-21 2015-10-01 Karl Rohr Finish curing method and system for leather-based substrates
DE102013225132A1 (de) * 2013-12-06 2015-06-11 Evonik Industries Ag Vorschäumung von Poly(meth)acrylimid-Partikeln für das anschließende Formschäumen in geschlossenen Werkzeugen
CN108014958A (zh) * 2017-12-29 2018-05-11 重庆捷科隆金属科技有限公司 一种金属件的防腐处理设备
IT202200011222A1 (it) 2022-05-27 2023-11-27 Lamberti Spa Nobilitazione di pelli in crust

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06192459A (ja) * 1992-12-25 1994-07-12 Three Bond Co Ltd 近赤外光硬化型発泡樹脂組成物
US6231932B1 (en) * 1999-05-26 2001-05-15 Ppg Industries Ohio, Inc. Processes for drying topcoats and multicomponent composite coatings on metal and polymeric substrates
AT5281U1 (de) 1999-09-13 2002-05-27 Schaefer Philipp Leder, insbesondere narbenleder oder mit einer zurichtung versehenes spaltleder, das an seiner der sichtseite gegenüberliegenden rückseite eine schicht aufweist, sowie verfahren zur herstellung eines solchen leders
AT4947U3 (de) * 2001-10-04 2002-06-25 Schaefer Philipp Vollnarbiges rindnappaleder und verfahren zur herstellung desselben
EP1279746A1 (fr) * 2001-12-21 2003-01-29 AKZO Nobel N.V. Procédé de préparation de cuir
AT6040U1 (de) 2002-04-19 2003-03-25 Schaefer Philipp Leder und verfahren zur herstellung desselben
AT7186U1 (de) * 2003-10-20 2004-11-25 Basf Ag Verfahren zur beseitigung von fehlstellen in der narbenschicht eines vollnarbigen leders, sowie leder, dessen fehlstellen in der narbenschicht beseitigt sind

Also Published As

Publication number Publication date
ATE488607T1 (de) 2010-12-15
PL2004864T3 (pl) 2011-04-29
DE502007005675D1 (de) 2010-12-30
DE202006016363U1 (de) 2007-02-01
MX2008012667A (es) 2009-02-03
AT8680U1 (de) 2006-11-15
WO2007115680A1 (fr) 2007-10-18
EP2004864A1 (fr) 2008-12-24
KR101437697B1 (ko) 2014-09-03
CN102787184A (zh) 2012-11-21
ZA200808048B (en) 2009-12-30
NO20084417L (no) 2008-10-28
KR20080111031A (ko) 2008-12-22
CN101415845A (zh) 2009-04-22
CN101415845B (zh) 2012-12-05
AR060298A1 (es) 2008-06-04

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