Preparation method and application of aqueous split leather

Abstract

The invention discloses a preparation method and application of an aqueous split leather. According to the preparation method, regenerated leather or split leather is taken as the base material; then aqueous slurry is applied to bottom layer coating, foam layer coating, and surface layer spraying; and finally embossing or line suction is performed to prepare the split leather. An aqueous material is used to process regenerated leather and split leather so as to produce split leather for preparing cases, sofa, and the like. The problems such as safety problems, environment protection problems, residual toxic organic solvent problems, and the like can be solved. At the same time, the peeling strength, anti-aging performance, and anti-hydrolysis performance of split leather are all greatly improved. Compared with the split leather processed by a conventional solvent coating agent, the peeling strength is increased from 2-3 kilograms to 5-7 kilograms, and the hydrolysis resistant period is prolonged from 3 years to 5-8 years.

Description

technical field [0001] The invention belongs to the field of leather manufacturing, and relates to a process method for treating split leather and regenerated leather with water-based PU resin materials to prepare film transfer leather and split leather, in particular to a preparation method for water-based split leather. Background technique [0002] Genuine leather can be divided into top layer leather and second layer leather. The top layer leather is obtained by splitting thick leather with a leather machine, and the top layer is used to make full-grain leather or repaired leather to prepare high-end products. The two-layer leather is made of two-layer leather through a series of processes such as painting or filming. Its fastness, abrasion resistance, and hydrolysis resistance are poor, and it is the cheapest type of genuine leather. However, due to its low price and its Due to its certain leather characteristics, it is widely used in various leather goods, furniture, c...

AI Technical Summary

Problems solved by technology

[0003] The traditional two-layer leather is mainly treated with solvent-based PU resin. A large amount of organic solvents are used in the production process, which not only has safety and environmental protection problems, but also toxic and harmful substances will remain in the finished product, which will endanger the personal safety of users.

In addition, the two-layer leather products treated with solvent-based systems on the market still have disadvantages such as low peel strength, poor hydrolysis resistance and aging resistance.

[0004] With the continuous improvement of safety, environmental protection and hygiene requirements in various countries, the original solvent-based treatment process has been severely restricted and will be completely banned in the near future, which will seriously affect the development of my country's second-layer leather industry.