1. Generally speaking, resin should be selected according to different leather making technology and the requirements of physical properties of synthetic leather.
From the technological point of view, the low use of resin selection must be soft, can not have the feeling of rigidity after sealing the bottom;
The adhesive layer resin should choose the resin with strong binding fastness and high hydrolysis resistance, so as to effectively prevent the occurrence of water degumming or low peeling strength, the middle layer resin is suitable for softness and elasticity, and the adhesive layer resin should be selected as the resin with strong binding fastness and high hydrolysis resistance.
The top layer resin was investigated and selected according to the requirements of synthetic leather.
If the top resin is not selected properly, the style characteristics of synthetic leather will be completely changed.
Therefore, the selection of resin, the focus is to select the top resin.
In general, shoe leather needs to choose water-based high modulus resin, water-based resin with wear resistance, scraping resistance, folding resistance, if it is to do light color or white leather sports shoes, should choose high modulus yellowing water-resistant resin.
Sofa leather needs to choose water-based medium modulus resin, this kind of resin should have anti-wear and scratch resistance, but also have good resistance to dirt and dirt, with good feel, especially leather-like touch.
Clothing and soft bag leather should choose low modulus resin, this kind of resin, must have low temperature softness, rich elasticity, touch similar to leather, at the same time should have the requirements of dry cleaning and water cleaning.
That is, the requirements of water resistance and solvent resistance are particularly high.
2. The correct selection of processing technology of ultra-fiber leather is generally the choice of pure dry process of synthetic leather. Although the process is single, due to the different requirements of leather surface and the different properties of leather, the selection of processing technology is also very important.
The process is determined according to the leather pattern.
The superfiber base cloth contains certain fibers loose on the surface. If these fibers are not sealed or filled, they will cause uneven surface, affect the brightness and affect the visual sense on the ultra-fiber fine pattern leather, especially on the ultra-fiber mirror leather.
Therefore, if the production of fine pattern or mirror leather, it is usually necessary to carry out ultra-fiber based cloth cover treatment.
At the same time, in the dry production process, the sizing process of more than two knives is generally selected, and the visual effect of leather surface is improved by increasing the thickness of the coating film.
For the ultra-fiber leather with deep pattern, the sizing times and sizing quantity are based on the non-exposed furrow bottom as the basic standard.
Different processes were determined according to the performance of different synthetic leather.
Generally speaking, shoe leather needs a higher strength surface, therefore, the surface should maintain a higher thickness, the middle layer can be thinner, sofa leather should not only have better surface physical properties, but also have better touch and elasticity.
Therefore, a considerable amount of resin is selected for the top layer and the middle layer.
Clothing leather and handbag leather, etc., pay more attention to elasticity and feel, so we should pay attention to the increase of the sizing amount of the middle layer, at the same time, the adhesive layer resin must be low modulus and high dosage.