Technical Measures For Testing And Improving Properties Of Washable Leather

For example, some of the twelve alkyl sulfates prescribed by the IUF-423 standard are used, some of them are [3] with silk wool washing liquid, others use 0.5% neutral soap or washing powder, others use 0.5% alkaline soap [5], and their washing equipment, bath ratio, bath temperature, time, frequency, drying method and operation steps are also very inconsistent.

The above washing methods come from the researchers' understanding of the characteristics of natural protein fiber, product characteristics, performance requirements, the purpose of experimental research and test conditions. It is of some significance from the research point of view. In terms of the commercial properties and practicability of washable leather, the washing method deviates greatly from the ISO test standard adopted by ITS inspection group.

This can easily lead to the nonstandardization of the inspection of the quality characteristics of washable leather products, which is likely to cause trouble for the export of washable leather.

Shrinkage rate of less than 5% is qualified.

10 steel balls, 0.4%ECE detergent and 0.1% sodium perborate solution were added to the drum washing machine. 30min was washed at 40 degrees and repeated 3 times.

Stained fabric is cellulose acetate (acetate), cotton fiber (cotton), nylon (nylong), chemical fiber (polyester), acrylic fiber (actylic) and wool fiber (wool).

Stained 4-5 grade, fade 3-4 grade is qualified.

It is difficult to ensure the dimensional stability of washable leather by emphasizing the softness and making strong handling in the preparation section, using strong waterproof polymer tanning agent and fatliquoring agent.

Chemical treatment is the main way to improve dimensional stability of washable leather. Macromolecule network cross-linking technology must run through the whole process.

For example, chrome aldehyde combination tannage, proper waterproofing fatliquoring agent combined with fatliquoring, fat adding, multi process tanning, dyeing with oil, using a variety of cationic finishing auxiliaries, and making leather moderately soft and not flat are all important technologies to improve dimensional stability of washable leather.

The statistical results of repeated contrast tests showed that the leather yield of each pig leather with only soft and non rigid sheets was only reduced by 0.7 + 0.1 inches.

From the selling price, the price of washable leather is 2 yuan higher than that of ordinary leather, and the economic benefit is 1.5-2.0.

The color fastness of washed leather depends on the molecular structure of the dye and the way in which the dye combines with the protein fiber. It is also influenced by the fastness and the technological conditions of the fatliquoring agent.

It must be pointed out that no kind of dye or dye of any company or manufacturer can completely meet the requirement of color fastness of washing leather, all kinds of dyes should be screened comprehensively and the suitable dye will be determined finally.

The binding fastness of fatliquoring agents is an important factor affecting the fastness of dyes. The migration and saponification of oils during washing process are easy to cause coloring. Therefore, the fatliquoring agents must be combined.

Strengthening dyeing and finishing is a technical measure that can not be ignored in improving color fastness. Cationic leather chemicals or cationic textile chemicals have certain effect. Only after washing with cationic chemicals, can their color fastness withstand the requirements of saponification and oxidation washing in the ISO standard.