EP0027964A1 - Procédé pour la trempe et le pelanage des peaux et fourrures - Google Patents

Procédé pour la trempe et le pelanage des peaux et fourrures Download PDF

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Publication number
EP0027964A1
EP0027964A1 EP80106304A EP80106304A EP0027964A1 EP 0027964 A1 EP0027964 A1 EP 0027964A1 EP 80106304 A EP80106304 A EP 80106304A EP 80106304 A EP80106304 A EP 80106304A EP 0027964 A1 EP0027964 A1 EP 0027964A1
Authority
EP
European Patent Office
Prior art keywords
liming
skins
hides
liquor
salt
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.)
Granted
Application number
EP80106304A
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German (de)
English (en)
Other versions
EP0027964B1 (fr
Inventor
Knud Lassen
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
Priority to AT80106304T priority Critical patent/ATE2152T1/de
Publication of EP0027964A1 publication Critical patent/EP0027964A1/fr
Application granted granted Critical
Publication of EP0027964B1 publication Critical patent/EP0027964B1/fr
Expired legal-status Critical Current

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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
    • C14C1/00—Chemical treatment prior to tanning
    • C14C1/06—Facilitating unhairing, e.g. by painting, by liming
    • 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
    • C14C1/00—Chemical treatment prior to tanning
    • C14C1/04—Soaking

Definitions

  • the invention relates to a process for softening and liming skins and furs under the conditions which are customary for this, the surfactants customarily used being replaced by water-soluble salts of a polymer containing carboxyl groups. This avoids foaming during soaking and liming and in the subsequent processes and results in better leather.
  • the switch is the first step of the so-called water workshop, which includes all stages that precede the actual tanning.
  • the switch is intended to free the skin from adhering dirt, blood and any preservatives (especially table salt) and to return the skin to the swelling state it had immediately after slaughtering.
  • the switch consists in treating the hides and skins with water. This should be as soft and cool as possible (to suppress putrefaction). Especially with dried hides and skins, a turnout with pure water would take a very long time. Decay damage would hardly be avoidable. It is therefore endeavored to accelerate the switch and to inhibit putrefaction. For this purpose, alkalis were added earlier, nowadays mainly a wide variety of surfactants, some with a bactericidal effect.
  • surfactants generally causes foaming, which often has a disruptive effect during the softening and subsequent processes right down to the tanning, not only because of the overflow from open vessels, but above all because of the problems of levelness, especially when greasing and dyeing , but also when tanning.
  • Another disadvantage of the surfactants is the hardening of the liming sludge in the sewage treatment plants. Closing The surfactants are difficult to wash out completely from the leather, and leather containing surfactants remains water-absorbent.
  • the next step after soaking is the liming in leather production. It is primarily used for loosening (hair-preserving liming) or destroying (staining) the hair by chemical or enzymatic means, as well as a certain skin disruption by which the skin is prepared for tanning.
  • the most common liming chemicals are lime and sulfide. More modern processes work with mercaptan instead of inorganic sulfides, and lime can also be replaced with advantage, namely with sodium hydroxide solution in combination with sodium sulfate.
  • surfactants with the aforementioned disadvantage of foaming are used as aids for accelerating and for achieving a more uniform liming effect.
  • sugar or molasses as a liming aid is of less importance for economic reasons.
  • the invention was based on the object of developing an economical process for the soft and liming with the advantageous action of the surfactants customary hitherto (accelerating and leveling) without their disadvantages (ie not foaming).
  • the solution to this problem was found in a soft and liming process according to the claim.
  • the amounts of water-soluble salt of a carboxyl group-containing polymer to be used are 0.2 to 2, preferably 0.3 to 1 percent by weight, based on salt or soft weight (twice as much in terms of dry weight), and 0.2 to in fur skins 2, preferably 0.5 to 1 g / 1 liquor.
  • the usual conditions of the switch are: liquor length 70 to 400%, based on salt weight (with dry weight the values double); chemicals are used to set a pH of 7 to 11 and / or surfactants in amounts of up to 2% and optionally bactericides, the amount of which depends on the effectiveness and the desired action; the temperature should be in the range of 12 to 32, preferably 20 to 25 ° C; the turnout can take 5 to 48 hours.
  • the polymer containing carboxyl groups or its salt can be used either only during the softening or only during the liming, but preferably during the soaking and liming.
  • the K value of the fully neutralized salt ie 1 mol NaOH or NH 4 OH per mol carboxyl groups; the pH of the 1% solutions is between 8 and 9) according to H. Fikentscher, Cellulosechemie 13 (1932), pages 58-64 and 71-74 should be in a 5% saline solution at 20 ° C in the range of 10 to 150, preferably 30 to 100.
  • Polymers containing carboxyl groups are to be understood primarily as meaning the homo- and copolymers of (meth) acrylic acid and maleic acid (or their anhydride) with other ethylenically unsaturated compounds, provided that their sodium and ammonium salts are used in the stated concentrations and under the conditions (when salted hides and skins are soft, relatively high salt concentrations in the soft liquor; saturated liming solution in liming! are soluble.
  • the copolymers can contain up to 80, preferably up to 60 percent by weight of (meth) acrylic acid or maleic anhydride (MA) copolymerizable ethylenically unsaturated compounds without a carboxyl group, for example acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, acrylic acid ester, methacrylic acid ester, ethylene, isobutene, styrene, vinyl isobutyl ether . It should of course be taken into account that, with regard to the water solubility of the neutralized polymers, larger proportions of hydrophilic comonomers are possible than of hydrophobic ones.
  • MA maleic anhydride
  • the particularly preferred polymers contain 0 to 50% by weight of the carboxyl group-free comonomers; they may also be more comonomers as copolymerized units, for example copolymers of acrylic acid, Acr y lni- tril and acrylamide.
  • the copolymers in question are known and are obtained by polymerizing (meth) acrylic acid or by copolymerizing the same or from MA with suitable comonomers. It is essential that the polymers are water-soluble in the neutral (partially neutralized) or at least in the weakly alkaline range (fully neutralized), that is to say at a pH in the range from 7 to 9.
  • salts are obtained by polymerizing the sodium or ammonium salts of acrylic acid or methacrylic acid alone or in a mixture with suitable comonomers, or by neutralizing the polymers of the abovementioned Acids with ammonia or preferably sodium hydroxide solution, or by copolymerizing maleic anhydride with comonomers such as styrene, ethylene, 1-olefins such as isobutene, or vinyl isobutyl ether, preferably in a molar ratio of 1: 1, and then hydrolyzing the anhydride groups with an equivalent amount of sodium hydroxide solution.
  • the fleet lengths and percentages given in the examples relate to the salt or soft weight or the dry weight of the hides and skins, unless stated otherwise or are self-evident.
  • the softening time is reduced by approximately 30% compared to the same recipe without the addition according to the invention.
  • Soft air-dried raw material 400% water 28 ° C 1% of the sodium salt of a copolymer of 60 parts by weight of acrylonitrile and 40 parts by weight of acrylic acid with a K value of 80 0.5% soda lime. 10 h, drain the bath
  • the switch is accelerated by 30 to 40% compared to the same recipe without the addition according to the invention; the water absorption of the softened skin is much stronger; the fleshing after the switch is easier.
  • the turnout is accelerated by approx. 30%; the fleshing after the switch is facilitated; the meat side and, in the case of light-colored skins, the hair cover are noticeably lightened compared to a switch without the additive according to the invention.
  • the switch is accelerated by about 50% compared to one without the addition according to the invention; the fleshing after the switch is much easier due to better water absorption; Here, too, the meat side and possibly the hair blanket are noticeably lightened.
  • Ashtray of salted raw material 150% water 28 ° C 0.3% of the ammonium salt of polyacrylic acid with a K value of 40 0.5% sodium sulfhydrate (NaHS) 2% sodium sulfide 60% 2.5% lime hydrate 18 h
  • Ashtray of dried goat skins 100% water 28 0 C 0.5% of the sodium salt of a copolymer of styrene and maleic anhydride in a mole ratio of 1: 1 with a K value of 40 3% sodium sulfide 60% 3% hydrated lime 18 h
  • the liming digestion is accelerated, the bare parts are smoother and cleaner, the color is lighter, the mechanical processing of the bare parts (fleshing, painting) is facilitated, limescale shadows are avoided when rinsing with hard water.

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)
  • Detergent Compositions (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Stringed Musical Instruments (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Glass Compositions (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
EP80106304A 1979-10-24 1980-10-16 Procédé pour la trempe et le pelanage des peaux et fourrures Expired EP0027964B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106304T ATE2152T1 (de) 1979-10-24 1980-10-16 Verfahren zum weichen und aeschern von haeuten und fellen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792942964 DE2942964A1 (de) 1979-10-24 1979-10-24 Verfahren zum weichen und aeschern von haeuten und fellen
DE2942964 1979-10-24

Publications (2)

Publication Number Publication Date
EP0027964A1 true EP0027964A1 (fr) 1981-05-06
EP0027964B1 EP0027964B1 (fr) 1982-12-29

Family

ID=6084271

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80106304A Expired EP0027964B1 (fr) 1979-10-24 1980-10-16 Procédé pour la trempe et le pelanage des peaux et fourrures

Country Status (6)

Country Link
EP (1) EP0027964B1 (fr)
JP (1) JPS5667399A (fr)
AT (1) ATE2152T1 (fr)
AU (1) AU6362280A (fr)
CA (1) CA1147908A (fr)
DE (2) DE2942964A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5777119A (en) * 1993-04-26 1998-07-07 Bayer Aktiengesellschaft Process for the preparation of 2,3-dihalogenoquinoxalines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005527658A (ja) * 2002-03-15 2005-09-15 ビーエーエスエフ アクチェンゲゼルシャフト レザー製造における高分子電解質の使用法
CN101798604B (zh) * 2010-02-10 2012-10-03 广东省石油化工研究院 一种保毛脱毛的制革方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Keine Entgegenhaltungen. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5777119A (en) * 1993-04-26 1998-07-07 Bayer Aktiengesellschaft Process for the preparation of 2,3-dihalogenoquinoxalines

Also Published As

Publication number Publication date
EP0027964B1 (fr) 1982-12-29
DE2942964A1 (de) 1981-05-07
ATE2152T1 (de) 1983-01-15
AU6362280A (en) 1981-04-30
JPS5667399A (en) 1981-06-06
CA1147908A (fr) 1983-06-14
DE3061517D1 (en) 1983-02-03

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