pu fabric/pu fabric knowledge

What are the raw materials?
Facing leather is made by treating the second and third layers of inner leather and low-quality leather of natural leather with a special film-making and laminating technology, and covering the surface of the leather with a polyurethane surface layer, which causes various appearances on the surface of the leather. Colors, various patterns, and without losing the advantages of leather's breathability and folding resistance, they have their own similarities in appearance and waterproof function.
The difference between leather and artificial leather
Artificial leather is the earliest substitute for leather fabrics invented. It is made by adding plasticizers and other additives to calendering and compounding it on cloth. Its advantages are The price is cheap, the colors are rich, and the patterns are complex. The disadvantage is that it easily becomes hard and brittle. Synthetic leather is used to replace artificial leather, and its price is higher than artificial leather. In terms of chemical structure, it is closer to leather fabric. It does not use plasticizers to achieve soft properties, so it will not become hard or brittle. At the same time, it has the advantages of rich colors and complex patterns, and its price is cheaper than leather fabric. Therefore, it is expected by consumers.
There are two ways to distinguish leather fabrics from artificial leather and synthetic leather: one is to use the back side of the fabric to differentiate. The method is that artificial leather and synthetic leather usually have a cloth base (or knitted cloth base) on the back side, which can be seen with the naked eye. The second is to use the method of burning and melting to distinguish. The method is to take a small piece of cloth and put it on the water. The leather cloth will not melt, but the artificial leather and synthetic leather will melt.
The difference between artificial leather and synthetic leather can be distinguished by soaking it in gasoline. The method is to use a small piece of cloth and put it in gasoline for half an hour, and then take it out. If it is artificial leather, it will become hard and brittle. If it is artificial leather, it will become hard and brittle. If it is synthetic leather, it will not become hard or brittle.
Definition of fabric:
In fact, it is polyurethane. Its main performance is wear resistance, solvent resistance and low temperature resistance (below -3℃), waterproof and breathable, windproof, soft and other properties. Under normal circumstances The bottom is milky white emulsion, which can be compounded with knitted fabrics, plain woven fabrics, non-woven fabrics and other fabrics to make various fabrics or interiors. It can be compounded with two or more layers of films with different properties. The thin-coated products we usually come into contact with are mainly used for coating outdoor clothing and bag fabrics. Products such as imitation leather (artificial leather) and brushed imitation suede are also coated products. Polyurethane coating can form many multi-functional and high value-added textile products, which are widely used in outdoor clothing, decoration, military industry and other industries.
Types of fabrics:
Tubu is divided into coating methods. Simply put, it can be divided into water-based and solvent-based polyurethane.
Solvent-based film-forming properties are good, strong adhesion to fabrics, high water pressure resistance, and more suitable for waterproof and moisture-permeable coatings.
However, the solvent type is toxic and flammable, and is not environmentally friendly. The water-based type is safe, non-toxic, and environmentally friendly, but has poorer adhesion to fabrics and weaker water pressure resistance than the solvent type.