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What is leather finishing agent?

Release time:

2021-10-02

In recent years, with the strengthening of environmental protection awareness and measures, the research and development of water-based polyurethane leather finishing agent has been highly valued, and the performance of cationic water-based polyurethane finishing agent has been widely studied at home and abroad.

This paper introduces the cationic water-based polyurethane bottom coating agent, with a fixed filling performance, back cover, can be and negatively charged leather blank to produce better adhesion, but also with the anion top coating agent from a strong coupling effect, so that the tanning feel softer, fuller, and further improve the quality of leather. Modified acrylic leather finishing agent acrylic resin is a kind of leather finishing agent material widely used in the world, with annual output accounting for about 70% of leather finishing agent. From the aspects of production cost, technological process and comprehensive performance, acrylic resin as a finishing material has many advantages over other chemical materials, but there is nothing in the world. Its defect is thermal adhesion and cold brittleness, which limits its use by climatic conditions. Since 1987, Rohm and Hass companies in the United States have developed new products, the second generation acrylic resin (sGA), which has made a breakthrough in hot sticky cold brittle. Subsequently, China has also achieved results in the modification of acrylic materials. However, most of its development methods are the introduction of functional monomers and acrylic monomers for multiple copolymerization, graft copolymerization, or external crosslinking agent, so that the linear structure becomes a network structure, thereby improving the heat and cold resistance of the coating film. The technical means used stay at the level of molecular structure. Although the thermal adhesion and cold brittle performance has been improved, it is still insufficient. Such finishing agents in the northern region is still not effective use. The main component of the protein adhesive is casein. Because the original casein (protein) is easy to deteriorate, the protein adhesive used now is modified. The coating is soft and natural, with strong bonding force, high temperature resistant ironing, firmly combined with the leather surface, and has clear natural grain patterns of leather. It can maintain good water vapor permeability and other sanitary properties of the leather. Nitrocellulose is mainly used as a brightener for leather top layer, and the vast majority of nitrocellulose, namely nitrocellulose (NC), is bright, beautiful, acid-resistant, oil-resistant, water-resistant and dry-wet-rub-resistant. It can be divided into high-gloss, dark-light, silk-like, wax-like, colorless, transparent, etc. The main feature is that the coating is brittle, no aging resistance, poor cold resistance and poor air permeability after film formation.

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