A kind of preparation method of solvent-free environment-friendly polyurethane automobile leather

Abstract

The invention provides a preparation method of solvent-free environment-friendly polyurethane automobile leather. The automobile leather comprises a surface layer and a foaming layer, wherein both the surface layer and the foaming layer are made of double-component solvent-free polyurethane; each of solvent-free environment-friendly polyurethane surface layer rein and solvent-free environment-friendly polyurethane foaming layer resin respectively used in the surface layer and the foaming layer is composed of a solvent hydroxyl mixture component A and an isocyanate component B. The specific preparation method of the automobile leather comprises the following steps: blade coating a shell fabric, drying the shell fabric, blade coating the foaming layer resin, adhering base cloth when the foaming layer resin is half-dry, curing and rolling. The automobile leather is prepared from the solvent-free environment-friendly polyurethane resin by one-step molding on a dry-method production line; the preparation method gets rid of a wet-method process flow in the traditional production process of polyurethane automobile leather and the production procedure is shortened for one half; no organic solvent is discharged, and the production process and finished products are friendly to the environment.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of chemical products, and relates to a preparation method of solvent-free and environment-friendly polyurethane automobile leather. Background technique [0002] At present, the automotive leather on the market is mainly PVC synthetic leather and polyurethane synthetic leather. Due to the small supply of genuine leather, only high-end cars are used. Water-based polyurethane leather is not easy to promote due to its performance defects. [0003] PVC automotive leather is to coat the fiber base cloth with PVC, which needs to add a large amount of plasticizer and other additives, and finally foam at high temperature. The obtained automotive leather has serious odor, plasticizer is not environmentally friendly and easy to migrate to the surface Defects, this defect is more serious in the small space of the car, so PVC car leather is being phased out. [0004] Solvent-based polyurethane au...

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Problems solved by technology

[0004] Solvent-based polyurethane automotive leather is currently mainly prepared through a two-step method. The first step is called a wet method: the solvent-based polyurethane resin is scraped onto the base fabric, washed with water, and the water is exchanged with the DMF in the resin, and the water enters the In the polyurethane resin, DMF enters the water, and after repeated replacements, the water is dried, and the resulting semi-finished product is called bass. During this process, a large amount of DMF enters the water. Although it can be recycled later, serious water pollution is inevitable. In addition, the bass produced by this process also contains a large amount of DMF; the second step is called the dry method: firstly, the solvent-based surface layer resin is scraped on the release paper and dried, and then the solvent-based adhesive is scraped again. Bond the bass to the cross-linking agent layer and dry it. A large amount of solvent in the process is discharged into the atmosphere and cannot be recovered, which seriously pollutes the environment. On the other hand, because the solvent is dried at high temperature, the solvent in the production workshop The concentration is very high, and the health of multiple workers is extremely unfavorable. Therefore, it is very meaningful from the perspective of environmental protection and from the perspective of users to prepare automotive leather by using a method that does not use any solvents.

[0005] Liu Yidong and others published the patent "A method for preparing solvent-free automotive interior leather based on in-situ polymerization" (publication number CN102409553A). The polyurethane is directly coated on the base fabric and pre-cured at 110-130°C. After foaming at a high temperature of 180-200°C, the surface is treated with water-based polyurethane, and the drying temperature is 150°C. Although this process is environmentally friendly, the process line is long, the oven temperature is high and energy consumption is high, and the surface is only treated with water-based polyurethane. , the physical properties of the product are poor

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