Chrome-free tanning process for ecological fur

A chrome-free tanning and fur technology, which is applied in the field of chrome-free tanning of ecological furs, can solve the problems of reducing the number of amino groups, reducing electric points such as tanned furs, and weak supporting effect of skin collagen fibers, achieving full and uniform tanning and widening the scope of use. , enhance the effect of dispersion

Active Publication Date: 2022-04-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common problem in the above two methods is that the organic tanning agent TWS mainly produces the tanning effect through the formation of a Schiff base structure between its aldehyde group and the collagen amino group. This tanning process will inevitably lead to a decrease in the number of amino groups, thereby causing the isoelectric point of the tanned fur Reduced, the ability to combine with the subsequent anionic dyeing and finishing materials is weakened, forcing the dyeing and finishing process to add a large amount of filler materials to obtain a better filling effect
In addition, the TWS tanning agent has a weak supporting effect on the collagen fibers of the skin, resulting in insufficient plumpness of the fur skin after dyeing and finishing
The above problems ultimately lead to the limitation of the popularization and application of TWS chrome-free fur tanning technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Put the pickled and softened sheep fur obtained by the conventional process in a drum, add water with a liquid ratio of 5, 65 g / L of sodium chloride, 0.5 g / L of sodium carbonate, 1.2 g / L of non-ionic degreasing Add agent FG-B and 1.8 g / L grease dispersant SAF, control temperature at 35°C, pH control at 5.5, after rotating for 30 min, add 13 g / L chrome-free organic tanning agent TWS, rotate for 120 min, stop for 60 min min, rotate for 120 min, stop for 60 min, use sodium carbonate and sodium bicarbonate to extract alkali to pH 8.0, then raise the temperature to 35°C, rotate for 120 min, then repeat the operation of rotating for 5 min per hour overnight, and rotate for 30 min the next day Finally, drain the liquid; add water with a liquid ratio of 13, 2 g / L oil dispersant SAF, and 7 g / L light-colored sodium lignosulfonate into the drum, control the temperature at 30 ° C, and rotate for 60 min. After adjusting the pH of the bath liquid to 3.5 with formic acid, add 20 g / L c...

Embodiment 2

[0089] Put the pickling softened lamb fur obtained according to the conventional process in the groove, add water with a liquid ratio of 20, 50 g / L of sodium chloride, 2 g / L of sodium carbonate, 0.5 g / L of non-ionic degreasing Add DW and 3 g / L oil dispersant SAF, control the temperature at 32°C, and control the pH at 4.5. After paddling for 45 min, add 20 g / L chrome-free organic tanning agent TWS, paddle for 330 min, and stop for 120 min. , use sodium carbonate and sodium bicarbonate to extract alkali to pH 7.0, raise the temperature to 42°C, paddle for 180 min, then repeat the operation of rotating for 5 min per hour overnight, paddle for 30 min the next day, drain the liquid; Add water with a liquid ratio of 5, 1.3 g / L oil dispersant SAF, and 4 g / L light-colored sodium lignin sulfonate into the tank. The temperature is controlled at 32 ° C, and the pH of the bath is adjusted with formic acid. After reaching 3.8, add 8 g / L chrome-free metal tanning agent TWLZ, paddle for 120 ...

Embodiment 3

[0092] Put the softened Tuscany sheep fur obtained by the conventional process into a drum, add water with a liquid ratio of 13, 80 g / L of sodium chloride, 1.2 g / L of sodium carbonate, 2 g / L The non-ionic degreasing agent TJ-A124 and 0.5 g / L oil dispersant SAF, the temperature is controlled at 30 ℃, the pH is controlled at 5.0, after rotating for 60 min, add 6 g / L of chrome-free organic tanning agent TWS, and rotate for 60 min min, stop for 30 min, rotate for 180 min, use sodium carbonate and sodium bicarbonate to extract alkali to pH 7.5, raise the temperature to 38°C, rotate for 240 min, then repeat the operation of rotating for 5 min per hour overnight, and rotate for 30 min the next day Finally, drain the liquid; add water with a liquid ratio of 20, 0.5 g / L oil dispersant SAF, and 10 g / L light-colored sodium lignosulfonate into the drum, control the temperature at 35 °C, and rotate for 120 min. After adjusting the pH of the bath solution to 4.0 with formic acid, add 30 g / L...

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Abstract

The invention discloses a chrome-free tanning process for ecological furs. The chrome-free tanning process is characterized in that a'TWS + sodium lignin sulfonate + TWLZ 'ternary combined tanning process system is adopted. Sodium lignin sulfonate has a fixing effect on the TWS tanning agent, so that the TWS tanning agent cannot be subjected to detanning under a low pH condition, and the dispersion effect of the TWS tanning agent on collagenous fibers is enhanced, so that the TWLZ tanning agent can more uniformly permeate and be stably combined in a leather plate, and the defects of low isoelectric point and poor fullness of tanned furs of an existing TWS tanning system are effectively overcome; the fur which is full and uniform in tanning, high in isoelectric point and good in fullness is obtained, the application range of the chromium-free ecological fur is greatly widened, and development of the chromium-free tanning technology of the ecological fur is promoted.

Description

technical field [0001] The invention belongs to the technical field of leather processing, in particular to a chrome-free tanning process of ecological fur. Background technique [0002] Fur, also known as fur and fur, refers to a valuable product obtained by tanning, dyeing and finishing the animal skin with hair. Fur has outstanding functions of keeping warm and keeping out the cold, soft and comfortable to the touch, and has a strong sense of fashion. Fur processing needs to protect the structure of the coat and epidermis from damage, so that a higher liquid ratio and weaker mechanical action are required in the fur processing process, and leather-based materials such as tanning agents can only penetrate in one direction through the flesh surface. In the skin board. Therefore, there are obvious differences between fur processing technology and leather processing technology. [0003] The development of new ecological fur chrome-free tanning technology is an inevitable t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/04C14C3/16C14C3/24C14C3/28
CPCC14C3/16C14C3/28C14C3/24C14C3/04
Inventor 王亚楠余跃石碧周建飞曾运航张文华
Owner SICHUAN UNIV
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