JPH0768560B2 - How to make leather waterproof and water repellent - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for making leather waterproof and water repellent.

[0002]

2. Description of the Related Art A tanned leather made by a conventional general tanning method has a drawback that it is poor in waterproof and water repellency.

[0003]

[Problems to be Solved by the Invention] Through a conventional leather tanning process, neutralization, retanning and dyeing process, an animal emulsifier having a high hydrophobic effect and a high-quality paraffin polymer emulsion in the greasing process and subsequent processes. , And a fatty acid ester-based greasing agent, followed by a greasing step and a greasing step followed by addition of a fatty acid chromium salt waterproofing agent, and finally a step using a water repellent (fluorine resin emulsion) for a long period of time. It is an object of the present invention to obtain a method for producing leather that maintains waterproofness and water repellency.

[0004]

[Means for Solving the Problems] Water reconstitution, lime pickling, band knife machine (dividing the gin and floor surfaces), demineralization and fermentation, pickles, chrome kneading, and shaving in the leather tanning process , Neutralized tannin (formaldehyde condensate of aromatic sulfone compound, lactate and low molecular weight resin synthetic tanning agent, etc.) treatment, waterproofing and water repellency in the final greasing process after the treatment process using warm water for dyeing Perform processing. In the final step of fatliquoring, 100% animal emulsified oil (highly hydrophobic effect), nonionic oleic acid, high-quality paraffin polymer emulsion (mixture of paraffin and sodium polystyrene sulfonate), and fatty acid ester oil ( After soaking the leather in warm water containing oleic acid (sodium salt), fatty acid chrome salt (chromic fatty acid salt and organic solvent, strong cationic waterproofing agent, so-called chrome stearate) is used for waterproofing. Adjust pH to adjust waterproofness. And a water repellent treatment process in which the skin is immersed in warm water containing a water repellent (a fluororesin emulsion blocks the hydrophilic groups of the inner surface layer collagen to improve the water repellent effect). A method of imparting waterproofness and water repellency to leather, which comprises:

[0005]

[Examples] Salted skins of cattle, pigs, and other animals are rehydrated (using a degreasing agent), freshened (to remove fat and dirt), split into pieces, and calcified (slaked lime + sodium sulfide). + Add sodium hydrosulfide + degreasing agent) to remove hair, and make the fiber structure in an oily state. Then, using a band knife machine, the front surface skin and the back surface skin are separated. The back skin is used as the floor skin.
The surface skin is recalcified (slaked lime, 1% of the weight of the skin is used)
I do. On the next day, the recalcified skin is washed with water, the same bath as the deashing process using salts and organic acids, the fermentation process using a decomposing agent is performed, and the water is washed before the pickling process. . Then, after a chrome tanning process, the tanning is taken out from the drum and flat stacked for 2 days. A journaling shaving machine determines the thickness depending on the application, and performs neutralization, lettering and dyeing processes. The steps up to this point are conventional general prescriptions, and waterproofing and water repellents are used in the final greasing step. The fatliquoring step is performed by immersing the skin in warm water (about 92%) at 60 ° C. to which 4% animal milk oil and 2% high-quality paraffin polymer emulsion waterproofing agent 2% fatty acid ester oil were added. After that, a waterproofing step in which a fatty acid chrome salt cationic waterproofing agent is added is performed in the same bath, the pH is adjusted with formic acid, a water repellent agent 6 is added, and the water repellent step of fixing to collagen fibers is completed. After that, after a washing process, horseback riding for one day. The next day, vacuum-tighten, air-dry and soften the skin with a vibration machine to perform a net-tensioning process.
Then, the edge cutting process, smoothing the surface with a polishing machine, paste + water-based binder, casein,
A coating process and a spray process are performed with an oil-based water-based paint, the surface is pressed by a press to make the surface smooth, and a mixture of lacquer emulsion + thinner and a solubilizing agent is sprayed, followed by pressing. The washing process and the finishing process are the same as the conventional process. The numerical values are shown in Table 1 of Table 1.

[Chemical 6]

[Table 1]

[0006]

As described above, the method of imparting waterproofness and water repellency to the leather according to the present invention is as follows:
A mixture of 00% animal emulsified oil (highly hydrophobic effect) oleic acid nonion, high quality paraffin polymer emulsion (mixture of paraffin and sodium polystyrene sulfonate), and fatty acid ester oil (soda salt of oleic acid). Perform a greasing process using a hydrophobic waterproof greasing agent, and in the same bath fatty acid chrome salt (chrome fatty acid salt, organic solvent strong cationic waterproofing agent, so-called chrome stearate)
After cross-linking the chrome tanned leather more sufficiently, the pH is adjusted with formic acid to further enhance waterproofness. And a water repellent agent (a so-called zirconium metal stone, which is a fluororesin emulsion that blocks the hydrophilic groups of the inner surface layer collagen by the fluororesin emulsion to improve the water repellent effect).
Since it is bonded on both sides so as not to lose the waterproof property and the water repellency easily, there is an effect that a soft or hard leather which does not lose the waterproof property and the water repellency for a long time can be produced.

Claims (1)

[Claims] 1. A method of rehydrating water in a tanning process of leather, lime pickling,
Band knife machine (separate gin and floor), deashing and fermentation, pickle, chrome tanning, shaving, neutralized tannin (formaldehyde condensate of aromatic sulfonide, lactate and low molecular weight resin synthetic tanning agent) Etc.) Water-repellent and water-repellent treatment is carried out in the final greasing step after the treatment step using warm water for dyeing. In the final step of fatliquoring, 100% animal emulsified oil (highly hydrophobic effect) oleic acid nonionic 1 and good paraffin polymer emulsion (mixture of paraffin and sodium polystyrene sulfonate) 2; Fatty acid ester oil (soda salt of oleic acid) 3 After the fatting step of immersing the leather in warm water, fatty acid chrome salt (chrome fatty acid salt and organic solvent strong cationic waterproofing agent, so-called chrome stearate) 4 The waterproof property is adjusted by adjusting the pH with formic acid. A water repellent that dips the skin in warm water containing a water repellent (a so-called zirconium metal soap) that improves the water repellency by blocking the hydrophilic groups of the inner surface layer collagen with the fluororesin emulsion. A method of imparting waterproofness and water repellency to leather, characterized by performing a treatment step. [Chemical 1] [Chemical 2] [Chemical 3] [Chemical 4] [Chemical 5]