Method for producing chamois leather using epoxidized oil

Abstract

The invention belongs to leather process technology, in particular a method for producing chamois leather using epoxidized oil, comprising the following steps: putting the pretanned pelt or fur into the normal temperature controlled rotary drum, adding alkaline solution to adjust pH value into alkaline, draining the alkaline solution, and adding catalyst or accelerant and epoxidized oil into the rotary drum, keeping the temperature at a certain temperature for several times, after reacting, recycling the remaining oil, then washing using degreasant and / or alkali, then adjusting pH value, aluminum tanning, aldehyde tanning or other tanning, and then drying, dampening and milling, finally gaining the chamois leather. The invention enables epoxidized oil to directly react with collagen and fix oil on the hide fiber, so that the shortcoming that traditional oil tanning takes oil as raw material, instead of reactant is overcome, and oil oxidizing process of traditional chamois leather is omitted. The chamois leather produced by the method has advantages of high intensity, good flexibility, strong hygroscopicity and water-wash resistance, applicable for the leather for cleaning, filtering and washing clothes.

Description

technical field [0001] The invention relates to a method for producing oil-tanned leather by using epoxidized oil, belonging to the light industry. Background technique [0002] Oil-tanned leather, also known as antelope or suede. It has some unique properties: the finished leather fiber is fine, the leather body is soft, plump, and the specific gravity is light (0.3-0.4Kg / m 3 ), high elongation (45%, 1Kg / mm 2 ), ability to wash with water and soap solution. Can be used in clothing, gloves, leather shoes. Due to its outstanding porosity and strong air permeability, it can be used to filter aviation gasoline, wipe optical glass and precision instruments, etc. The surface of oil-tanned leather is lipophilic, but it can absorb 400% to 600% of its own weight of water. After absorbing water and wringing out, it still contains about 180% of water. When used to clean the surface of polished objects, it can quickly absorb water droplets and moisture on the surface of the object...

AI Technical Summary

Problems solved by technology

[0009] (2) Long production cycle: the traditional oil tanning method generally takes 5 to 7 days, and some even take a month

[0010] (3) The reaction conditions are harsh and complex, and the controllability is poor: in order to promote the occurrence of oil oxidation, it needs to be carried out in a hot air drum, and hot air is introduced to use the oxygen in the air to oxidize the oil, and it needs to be carried out under a certain humidity. To ensure the temperature and humidity, it is difficult to control in place

In order to avoid drying and crusting, sometimes it is necessary to refuel, multiple oxidations, and the steps are cumbersome

[0011] (4) The reaction components are complex and the mechanism is unclear: due to the difficulty in controlling the oxidation process, the oxidation products are complex

Attempts to explain the tanning effects of such a complex product inevitably lead to confusion

It is precisely because the oil tanning mechanism itself is unclear and lacks theoretical guidance, the result can only be carried out according to experience in practice, which seriously affects the development of oil tanning technology

[0012] (5) Poor product quality: Oxidation and reaction are in the same system, and the conditions are difficult to control, and the uniformity is poor, so the phenomenon of inconsistent oxidation degree often occurs, and the oil is easy to oxidize and polymerize on the surface of the hide to produce brown spots, and it is impossible to produce white oil tanned leather

However, so far, there is no report on the direct use of epoxidized oils for oil tanning

[0018] Due to the previous oil tanning method, after forced oxidation, epoxy groups cannot be generated (as mentioned above)