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Tanning composition and method based on an acetal of an aldehydic tanning agent

A composition and technology of tanning agents, applied in the field of tanning leather and/or leather to manufacture leather products, pre-tanning and/or post-tanning compositions, capable of solving problems such as health hazards, pungent odors, and affecting the quality of leather products , to achieve uniform tanning and low toxicity

Active Publication Date: 2018-11-23
德瑞皮革科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can lead to uneven tanning which can adversely affect the quality of the leather goods manufactured
[0004] A further disadvantage of the known compositions and processes based on the use of this type of tanning agents mentioned at the outset is that aldehyde tanning agents are basically very toxic and have a pungent odor
However, in the case of known compositions and methods based on said compositions, inhalation of aldehyde vapors and direct contact with these aldehyde tanning agents are generally unavoidable, so that the work of using them for tanning hides and / or leather Exposure of personnel to increased health hazards

Method used

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  • Tanning composition and method based on an acetal of an aldehydic tanning agent
  • Tanning composition and method based on an acetal of an aldehydic tanning agent
  • Tanning composition and method based on an acetal of an aldehydic tanning agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] The hides and / or leathers to be tanned are provided in 3000 mL of water (hereinafter referred to as aqueous tanning liquor) in a suitable container with the pH adjusted to 7.5 to 8.5 and at a temperature of 25°C.

[0085] 4.5% by weight of an acetal of an aldehyde tanning agent, such as glutaraldehyde, is then added to the aqueous tanning liquor. Here the acetals are prepared as described in US 2,885,443 and / or US 4,448,977.

[0086] In the penetration step, for example in a rotatable drum provided for this step, the acetal-laden tanning liquor is applied to the hide and / or leather. The exposure time can be freely selected, eg depending on the hide and / or leather thickness. The thicker the hide and / or leather, the longer the exposure time should be chosen in order to achieve sufficient penetration of the acetal into the deeper layers of the hide. For example the duration of action may be between 2 and 7 hours. The preferred duration of action here is 5 hours.

[008...

Embodiment 2

[0093]The hides and / or leathers to be tanned are provided in 3000 mL of water (hereinafter referred to as aqueous tanning liquor) in a suitable container with the pH adjusted to 3.0 to 3.2 and at a temperature of 25°C. In the method according to example 2, unlike example 1, no penetration step (in which the aldehyde tanning agent in the form of acetal first acts on the hide and / or leather without reacting with the protein) is provided.

[0094] 2.1% by weight of an acetal of an aldehyde tanning agent, such as glutaraldehyde, is then added to the aqueous tanning liquor. Due to the low pH of the tanning liquor, aldehydes, for example in the form of glutaraldehyde, are released directly and can react with the hide and / or leather proteins. This step thus corresponds to the actual tanning step. The released aldehyde is then applied to the hide and / or leather, for example in a rotatable drum. A suitable action time here may be between 3 hours and 7 hours, preferably 5 hours.

[0...

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PUM

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Abstract

The invention relates to a composition containing an acetal of an aldehydic tanning agent for tanning hides and / or pelts and to a method for tanning hides and / or pelts in order to produce leather, wherein an acetal of an aldehydic tanning agent is used. By lowering the pH value, the aldehydic tanning agent can be released, whereby a tanning step is initiated. The composition and the method according to the invention are characterized by a lower toxicity compared to conventional compositions and tanning methods based on aldehydic tanning agents. Furthermore, an improved penetration of the tanning agents into deeper layers of the hide and / or the pelt is facilitated such that a particularly homogeneous tanning is achieved.

Description

technical field [0001] The present invention relates to a composition comprising a tanning agent for tanning hides and / or leather. Furthermore, the invention relates to a method for tanning hides and / or hides to produce leather goods. In particular the present invention relates to compositions and methods for pre-tanning and / or post-tanning, preferably pre-tanning. Background technique [0002] Many compositions and methods of the type mentioned at the outset are known. The tanning and in particular pretanning of hides and / or leathers by means of aldehyde tanning agents is generally known and is used commercially, for example in the so-called "wet whitening" process. Formaldehyde, propionaldehyde, glyoxal and, most often, glutaraldehyde are used here as aldehyde tanning agents. [0003] A key disadvantage of these known compositions and methods based on the use of the tanning agents is, however, that the tanning agents have too high a reactivity of the proteins of the hid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/16
CPCC14C3/16
Inventor C·嘉巴格恩N·舒尔特G·D·赫塔J·芬恩
Owner 德瑞皮革科技有限公司
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