Nano SiO2,TiO2 leather tanning agent using modified fat as dispersible carrier, and its preparing method

Abstract

The invention discloses the nanometer SiO2, TiO2 leather tan preparation using the grease of changing the character for the separating carrier and the producing process characterized in that the 100-150 shares of the nature animal, plant grease, the 10-35 shares of the C1-4 short chain fat mellow, the 0.5-1.0 shares of the activator are added in the active kettle, the temperature is promoted to 80-90 to act keep the 3-5 hours, the press is decompressed to 0.01 Mpa to shuck the short chain fat marrow, the said grease is added in the grease oxidation tower, the temperature is promoted to the temperature of 80-90, the aerating quantity is keep the 100-150 stere / hour, the oxide action keep 5-8 hours, the 25-35 shares of the sulfurous acid reagent, the 50-80 shares of removing ion water, the 1.5-3.0 shares of the exterior live ability reagent is added to keep the temperature of 80-85, the aerate quantity 40-45 stere / hour, the action 3-5 hours; the changing character grease separating carrier; then the 100 shares of the changing character grease is fetched to be mixed with the 50-60 shares of the van body containing the nanometer SiO2 or the TiO2, the 10-20 shares of the thinner to mill equably. Then the leather tan reagent is gained.

Description

technical field [0001] The invention relates to a kind of nano-SiO with modified oil as a dispersion carrier 2 or TiO 2 A leather tanning agent and a preparation method thereof belong to the field of preparation of nano leather tanning agents. Background technique [0002] In the manufacturing process of leather, chrome tanning agent plays a decisive role in improving the moisture and heat stability of leather. Because of its special electronic layer structure, chrome has good softness, extensibility, heat resistance stability and water vapor permeability after tanning. Since the establishment of the one-bath chrome tanning method in 1893, it has been widely used. For the production of leather, it has developed into the dominant tanning method. However, since the utilization rate of chromium salt in the current chrome tanning method is only 65% ​​to 75%, the direct discharge of a large amount of unabsorbed waste chromium liquid, the Cr contained therein +3 and Cr +6 It ...

AI Technical Summary

Problems solved by technology

Although the above-mentioned tanning agents can make the shrinkage temperature of the finished leather reach more than 90°C, there are still many technical defects in oxazolidine and organic phosphine chrome-free tanning agents, such as because the above-mentioned tanning agent molecules themselves have a strong positive charge, which is different from Subsequent chemical materials such as retanning agents, fatliquor, dyes (mostly negatively charged) are quite difficult to be compatible. In addition, the tanning reactions of oxazolidine and organic phosphine tanning agents are reversible, and the storage stability of finished leather is poor; , Vegetable-aluminum combined tanned leather also has defects such as poor storage stability, not washable, darker color, etc. Therefore, the existing chrome-free tanning agents are difficult to meet the technical needs of tannery manufacturers