Preparation method of solvent-free polyurethane interior trim leather of car

Abstract

The invention relates to a preparation method of solvent-free polyurethane interior trim leather of a car. The preparation method comprises the following steps: (1) coating release paper with waterborne polyurethane dispersoid, placing the release paper in an environment with a temperature of 100-120 DEG C, and drying to obtain a surface layer; (b) mixing component A and component B of polyurethane foam resin, coating the surface of the surface layer with the mixture, placing into an environment with temperature of 100-120 DEG C, and drying for 1-5min, so as to form a semi-dry foaming layer; and (c) attaching base cloth to the foaming layer, placing the foaming layer into an environment with temperature of 100-120 DEG C and curing for 10-15 hours, and then separating and rolling. The component A of the polyurethane foaming resin comprises the following components in percentage by weight: 90-95% of polycarbonate diols, 1-6% of a chain extender, 2-4% of a catalyst, 0.5-2.0% of a stabilizer, 0.1-0.2% of a defoamer and 0.5-5% of an inorganic filler. The component B of the polyurethane foaming resin comprises the following components in percentage by weight; 5.0-30%of polycarbonate diols, 30.0-45% of polytetrahydrofuran diols and 39.8%-50% of aliphatic diisocyanate. In the preparation process, no solvent is used, the technology is simple and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a preparation method of automobile interior leather, in particular to a preparation method of solvent-free polyurethane automobile interior 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. 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. [0003] Solvent-based pol...

AI Technical Summary

Problems solved by technology

[0003] 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.