EP1567679A1 - Procede de fabrication d'un produit semi-fini en cuir - Google Patents

Procede de fabrication d'un produit semi-fini en cuir

Info

Publication number
EP1567679A1
EP1567679A1 EP03785657A EP03785657A EP1567679A1 EP 1567679 A1 EP1567679 A1 EP 1567679A1 EP 03785657 A EP03785657 A EP 03785657A EP 03785657 A EP03785657 A EP 03785657A EP 1567679 A1 EP1567679 A1 EP 1567679A1
Authority
EP
European Patent Office
Prior art keywords
semi
leather
average particle
particle diameter
finished
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.)
Withdrawn
Application number
EP03785657A
Other languages
German (de)
English (en)
Inventor
Stephan Hüffer
Stefan Schroeder
Jürgen CARLE
Thorsten RÄDLER
Volker Bach
Tilman Lüdecke TAEGER
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.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP1567679A1 publication Critical patent/EP1567679A1/fr
Withdrawn legal-status Critical Current

Links

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
    • C14C3/00—Tanning; Compositions for tanning
    • C14C3/02—Chemical tanning
    • C14C3/08—Chemical tanning by organic agents
    • C14C3/16—Chemical tanning by organic agents using aliphatic aldehydes
    • 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
    • C14C3/00—Tanning; Compositions for tanning
    • 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
    • C14C3/00—Tanning; Compositions for tanning
    • C14C3/02—Chemical tanning
    • C14C3/28—Multi-step processes

Definitions

  • the invention relates to a method for producing a semi-finished leather product.
  • semi-finished leather products are usually produced by pre-tanning using the following two, fundamentally different processes: firstly, by pre-tanning with chrome-containing tanning agents to form the so-called wet blue semi-finished product, and secondly by chrome-free pre-tanning to the so-called wet white semi-finished product.
  • Semi-finished leather products can be mixed with biocides in the moist state and then, provided that a maximum temperature of 25 ° C is not exceeded during transport and storage, can be stored for up to approx. 1 year.
  • Semi-finished wet biue products have the disadvantage that they already contain chromium, i.e. that further processing to a chrome-free leather is not possible and the waste from further processing, for example folding, has to be worked up or deposited in a complex process.
  • their water content cannot be reduced below a value of around 40 to 80% by weight, since the skin appearance changes irreversibly when drying to lower water contents: wrinkles are fixed, later dyeing attempts lead to an uneven appearance, i.e. the quality is irreversibly deteriorated by drying attempts to lower water contents. Withdrawal is not possible without a reduction in quality.
  • wet white semi-finished products have the advantage that they are not contaminated with the heavy metal chromium, but they are extremely susceptible to attack by microorganisms, in particular mold, and are therefore considered to be practically impossible to transport.
  • semi-finished wet white products can practically not be dried to a water content below about 40 to 80% by weight, since they dry out like a horn with fiber bonding and reversion is therefore impossible.
  • biocides can also be toxic, sensitizing or allergenic to humans and / or substances that are toxicologically harmful, especially formaldehyde , split off.
  • EP-B 0 281 486 describes a process for the biological stabilization of pickled pelts, according to which a residual water content of only about 20% by weight can be achieved by water being selected by a substance from the group of polyalcohols, the condensates of fatty alcohols is replaced with ethylene oxide and the condensates of alkylphenols with ethylene oxide.
  • this method has the major disadvantage that substances with surface-active properties are introduced to stabilize the semifinished product, which determine the basic character of the semifinished product and have a negative effect on subsequent tanning steps, for example by influencing the fat distribution.
  • semi-finished products of this type have a relatively low shrinking temperature in the range of approximately 50 ° C.
  • the object is achieved by a process for producing a semi-finished leather product from an animal skin by pretanning with a chromium-free tanning agent, which is characterized in that a clay mineral is additionally used for the pretanning, which after stirring for 30 minutes in water at 50 ° C.
  • a rotor speed in the range of 5 to 25 m / s, a number average particle diameter of less than 2 ⁇ m or a bimodal size distribution with a first, finely divided fraction, the number average particle diameter of which is less than 0.5 ⁇ m, and a second, coarser fraction, the number average particle diameter is less than 5 ⁇ m, in each case according to the determination method according to ISO 13320-1, by combined laser light diffraction and light scattering, the proportion of the first, finely divided fraction being between 10 and 90% by weight, and that the pretanned animal skin is applied to one Water content of 5 to 45%, based on the total weight of the L eder semi-finished products, dries.
  • Clay minerals that, after stirring for 30 minutes in water at 50 ° C with a rotor speed in the range of 5 to 25 m / s, have a number average particle diameter of less than 2 ⁇ m or a bimodal size distribution with a first, finely divided fraction, the number average particle diameter of which is less than 0.5 ⁇ m and a second, coarser fraction, whose number-average particle diameter is less than 5 ⁇ m, the proportion of the first, finely divided fraction being between 10 and 90% by weight, are used as tanning agents or for the production of tanning agents from the not previously published German patent application DE 102 37 259 known.
  • Clay minerals with the particle sizes defined above form stable formulations for use in chrome-free or chrome tanning, which ensure improved properties of the leather obtained therewith.
  • treatment with a sufficient amount, usually about 950 ml of water, is necessary 50 g of the clay mineral at 50 ° C. and vigorous stirring, with a rotor circulation speed in the range from 5 to 25 m / s, preferably from 10 to 20 m / s, are required for 30 minutes, the clay mineral being dispersed in the water.
  • a rotor-stator-Ultraturrax ® mixer from LKA can be used for this. This treatment is intended to ensure that the clay mineral is delaminated until the particle size no longer changes.
  • the particle sizes and particle size distribution were determined in accordance with ISO 13320-1 by combined laser light diffraction and light scattering using an analysis device from Malvern, type Malvern 2000.
  • clay minerals with the particle sizes defined above are essential for their interaction with the collagen chains of the skin. This interaction is possible, for example, via hydrogen bonds between collagen and the surface hydroxyl groups of the clay minerals. It was surprisingly found that clay minerals with the defined particle sizes are irreversibly embedded in the skin.
  • Clay minerals are weathering products made from primary aluminosilicates, i.e. from compounds with different proportions of aluminum oxide and silicon dioxide. Silicon is tetrahedrally surrounded by four oxygen atoms, while aluminum is in octahedral coordination. Clay minerals predominantly belong to the phyllosilicates also known as layered silicates or leaf silicates, but in some cases also to the band silicates (cf. Römpp Chemie Lexikon, 9th edition, 1995, pages 4651 and 4652).
  • the clay mineral is a phyllosilicate.
  • the phyllosilicate can preferably be a kaolinite, muscovite, montmorillonite, smectite, saponite, vermiculite, hallosit or bentonite, in particular a hectorite or an organically modified variant thereof.
  • the substances are mixed with substances that, due to their chemical structure, are able to form strong hydrogen bonds with the clay mineral, in particular with urea or urea derivatives, alcohols, polyols, propylene carbonate organic amides Urethanes, saccharides or derivatives of saccharides, especially nitrocellulose, sulfite cellulose or ethylhexyl cellulose.
  • This treatment supports, among other things, the delamination of the clay mineral, especially layered silicate.
  • a chrome-free tanning agent is used for the pretanning, preferably an aldehyde tanning agent, an isocyanate, an aluminum salt, an oxazolidine or tetrakishydroxymethylphosphonium chloride.
  • Clay minerals with a number average particle diameter of less than 1 ⁇ m are preferably used.
  • the animal skins pretanned using a finely divided clay mineral are dried to a water content of 5 to 45%, based on the total weight of the semi-finished leather product, preferably to a water content in the range from 15 to 35% by weight, based on the total weight of the semi-finished leather.
  • the water content By setting the water content to a value below 45% by weight, preferably below 35% by weight, a state of the pretanned animal skin is achieved which is largely biologically stable and can nevertheless be re-soaked without problems, without impairing the quality of the end products made from it.
  • drying step is fundamentally not restricted with regard to the process conditions: drying can be carried out at ambient temperature and pressure, under vacuum and / or at elevated temperature, preferably by stretch drying. Tension drying results in largely flat, easily stackable semi-finished products.
  • the method according to the invention preferably has the further processing step of drying the semi-finished leather product by treating it with water or the aqueous solution of a tannery auxiliary, in particular an amphoteric or cationic polymer, preferably by spraying, to a water content in the range from 50 to 80% by weight, based on the total weight of the semi-finished leather, recedes.
  • a tannery auxiliary in particular an amphoteric or cationic polymer
  • Another advantage of the method according to the invention is due to the absorbency of the largely dried semi-finished leather product: for example, aqueous solutions of tanning agents with a low affinity for the skin are physically absorbed and uniformly inner skin areas transported and distributed, which has so far led to unsatisfactory results due to the comparatively low chemical potential when working in an aqueous liquor.
  • the semifinished leather product produced by the process according to the invention can thus be moistened in a further processing step with the aqueous solution of a tannery auxiliary which is absorbed into the semifinished leather product by physical forces, in particular osmosis, preferably mostly aqueous solutions of proteins, in particular Protein hydrolyzates or polymers. This can advantageously be carried out simultaneously with the step of retreating by spraying or dipping.
  • a semi-finished leather product is thus made available which is completely open with regard to further processing into end products.
  • Chrome-free work can be carried out up to the stage of the semi-finished leather product, with further processing being possible both chrome-free and chrome tanning.
  • the semi-finished leather product can be folded before drying as well as after receding, always producing chrome-free shavings.
  • the waste during folding which can amount to up to 30% of the material fed to the folding, is unproblematic because it is chromium-free, so it does not have to be disposed of as special waste, but on the contrary can be recycled as fertilizer.
  • a further advantage is that skin defects or abnormalities of the skin which impair the quality of the dried semifinished products can be better observed in the sense of the error detection and thus the sorting with regard to the skin quality can be carried out more easily, more quickly and with improved reproducibility.
  • Another advantage is the reduced water content, which leads to obvious economic advantages in terms of transportation and storage.
  • the morphological parameters are listed in Table 1 below.
  • the average particle size of the clay minerals was determined by laser diffraction / light scattering on freshly prepared suspensions with a solids content of 5% in each case according to ISO 13320-1.
  • Point 4.1 The test pieces had the dimensions 3 cm • 1 cm, the thickness was not determined; Point 4.2: only one instead of two samples per leather sample was tested;
  • the table shows mainly improved values in liquor consumption, foldability and shrinking temperature for examples B1 to B5, based on comparative example V0.
  • the semi-finished products obtained according to V0 or B1 to B5 were dried and then retanned.
  • the skins obtained according to Comparative Example V0 and Examples B1 to B5 were rolled, folded to 1.5 to 1.7 mm and cut into four strips of the same size, each about 1 kg.
  • the pre-tanned and dried skin strips were drummed for 3 minutes in a barrel together with, based on the dry weight, 300% water.
  • the receding behavior was assessed on a scale from 1 to 5, with good marks indicating that supple, absorbent skin was obtained without further mechanical treatment. Grade 5 indicates an irreversible cornification of the tissue.
  • the fiber appearance of the meat side was rated on a scale from 1 to 5.
  • Grade 5 also stands for an inhomogeneous fiber morphology with a high proportion of fiber bonds.
  • the leathers were washed twice with 500% water, wilted, air-dried and stabled.
  • the leather was evaluated with regard to the quality properties of fullness, levelness and grain strength on a scale from 1 to 5.
  • the tensile strength was determined in accordance with DIN 53328.
  • the comparison of the a-series (without drying) with the dried test strips of the series b to d shows mainly an improvement in the quality features of fullness, levelness, grain strength and tensile strength of the retanned end products.
  • the tanning liquor contained no clay mineral, whereas in examples 7 to 9 2.5% montmorillonite powder, corresponding to example B5, was used.
  • the pre-tanned skins were folded to 1.6 to 1.8 mm after wilting.
  • the skins from Examples B8 and B9 were dried overnight on a stenter at 45 ° C. and the skins from Comparative Example V6 and Example B7, on the other hand, were protected from drying out until further processing.
  • Example B8 the receding was carried out by dipping with water (150%) in a corresponding tub.
  • the skin was softened by spraying with a 20% solution of a protein hydrolyzate obtained from leather waste and then placed over bock for 2 hours.
  • the washed leathers were wilted, dried and stalled and assessed according to the quality characteristics listed in Table 3 below.
  • the chrome consumption rate (in%) relates to the amount of chrome offered.
  • the chromium concentration of the fleets was determined by titration.
  • the Hotten exhaustion relates to substances that are used in further retanning steps, in particular resin tanning agents, fatliquoring agents or dyes, samples being taken after each coloring and fatliquoring and assessed visually.
  • the table shows that in examples B7 to B9 all leather properties are improved compared to comparative example V6 and, furthermore, the hotten consumption is also improved.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un produit semi-fini en cuir à partir d'une peau d'animal par prétannage à l'aide d'une matière tannante sans chrome et d'un minéral argileux qui, après avoir été agité pendant 30 minutes dans de l'eau à 50 DEG C à une vitesse de rotation du rotor de 5 à 25 m/s, présente un diamètre de particules moyen en nombre inférieur à 2 ñm ou une répartition dimensionnelle bimodale, une première fraction en fines particules présentant un diamètre de particules moyen en nombre inférieur à 0,5 ñm et une seconde fraction plus grossière présentant un diamètre de particules moyen en nombre inférieur à 5 ñm, d'après la méthode de détermination selon la norme ISO 13320-1 par diffraction de lumière laser et dispersion de lumière combinées, la proportion de la première fraction en fines particules étant comprise entre 10 et 90 % en poids, puis par séchage de la peau d'animal prétannée jusqu'à une teneur en eau de 5 à 45 % par rapport au poids total du produit semi-fini en cuir.
EP03785657A 2002-11-26 2003-11-25 Procede de fabrication d'un produit semi-fini en cuir Withdrawn EP1567679A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10255095 2002-11-26
DE10255095A DE10255095A1 (de) 2002-11-26 2002-11-26 Verfahren zur Herstellung eines Leder-Halbfabrikates
PCT/EP2003/013204 WO2004048616A1 (fr) 2002-11-26 2003-11-25 Procede de fabrication d'un produit semi-fini en cuir

Publications (1)

Publication Number Publication Date
EP1567679A1 true EP1567679A1 (fr) 2005-08-31

Family

ID=32240434

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03785657A Withdrawn EP1567679A1 (fr) 2002-11-26 2003-11-25 Procede de fabrication d'un produit semi-fini en cuir

Country Status (9)

Country Link
US (1) US7753964B2 (fr)
EP (1) EP1567679A1 (fr)
KR (1) KR20050085142A (fr)
CN (1) CN1325662C (fr)
AR (1) AR042044A1 (fr)
AU (1) AU2003294721A1 (fr)
BR (1) BR0315817A (fr)
DE (1) DE10255095A1 (fr)
WO (1) WO2004048616A1 (fr)

Families Citing this family (11)

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Publication number Priority date Publication date Assignee Title
CN101781688B (zh) * 2009-01-19 2012-12-19 北京泛博科技有限责任公司 一种毛皮鞣剂、其制备方法和应用
CN101696456B (zh) * 2009-10-23 2012-10-03 四川大学 一种thp盐-纳米粘土结合鞣提高皮和皮粉的热变性温度的方法
CN102125336B (zh) * 2010-01-14 2012-09-12 株式会社上沼 再生皮革纸及其制造方法,及使用它制造的月形芯及其制造方法
CN103602763B (zh) * 2013-11-13 2015-08-05 四川大学 一种具有片晶结构的有机-纳米硅酸盐复合鞣剂及其鞣法
CN104450994B (zh) * 2014-10-22 2016-08-24 陕西科技大学 多官能团环氧树脂类鞣剂对山羊酸皮的鞣制工艺
MX2015005865A (es) 2015-05-08 2016-11-07 Química Stover S A De C V Proceso para la preparacion de colageno hidrolizado para la curticion y recurticion de cueros con desechos de cuero wet-blue, producto obtenido con tal proceso.
CN105925735B (zh) * 2016-05-06 2018-11-23 嘉兴学院 一种无盐免浸酸短流程无铬鞣制方法
CN105949369B (zh) * 2016-06-17 2018-06-15 陕西科技大学 皮革用多功能水滑石/聚合物纳米复合助剂的制备方法
CN106042563A (zh) * 2016-07-12 2016-10-26 陈国兵 一种可逆变色的皮革及其制作方法
US11851722B2 (en) 2018-01-16 2023-12-26 Tfl Ledertechnik Gmbh Chromium tanning agents
IT202200015948A1 (it) * 2022-07-27 2024-01-27 Gipel S R L Prodotto per la lavorazione del pellame

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AR212025A1 (es) * 1975-07-19 1978-04-28 Boehme Chem Fab Kg Procedimiento de preparacion de cueros y pieles
US4272242A (en) * 1977-07-16 1981-06-09 Henkel Kommanditgesellschaft Auf Aktien Use of water-insoluble aluminosilicates in tanning process for the production of leather
DE2732217A1 (de) * 1977-07-16 1979-02-01 Henkel Kgaa Verwendung feinteiliger wasserunloeslicher alkalialuminiumsilikate bei der lederherstellung
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Also Published As

Publication number Publication date
AU2003294721A1 (en) 2004-06-18
DE10255095A1 (de) 2004-06-03
BR0315817A (pt) 2005-09-13
CN1714158A (zh) 2005-12-28
AR042044A1 (es) 2005-06-08
CN1325662C (zh) 2007-07-11
US20060075573A1 (en) 2006-04-13
KR20050085142A (ko) 2005-08-29
WO2004048616A1 (fr) 2004-06-10
US7753964B2 (en) 2010-07-13

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