Solvent-free polyurethane slurry and preparation method thereof, and application of solvent-free polyurethane slurry in vacuum suction-embossed synthetic leather capable of resisting hydrolysis for 5 to 7 years

Abstract

The invention provides a solvent-free polyurethane slurry and a preparation method thereof, and an application of the solvent-free polyurethane slurry in a vacuum suction-embossed synthetic leather capable of resisting hydrolysis for 5 to 7 years. The solvent-free polyurethane slurry is composed of a component A and a component B with a mass ratio of 100: (45-110), wherein the component A is composed of polytetrahydrofuran diol, an alcohol chain extender, third-grade water, glass fiber, a pore-forming agent, a delaying type catalyst, a foam stabilizer and a photo-thermal stabilizing agent; andthe component B is composed of polytetrahydrofuran diol, polyisocyanate, a polymerization inhibitor and a catalyst. According to the invention, an embossing process capable of obtaining a stable cellular structure by using water as a foaming agent to participate in a reaction is adopted, and a vacuum suction-embossing process is employed, so the vacuum suction-embossed synthetic leather with a solvent-free polyurethane layer in the middle layer thereof is prepared; and the vacuum suction-embossed synthetic leather has soft handfeel and strong sense of true leather.

Description

technical field [0001] The invention belongs to the technical field of synthetic leather, and relates to a solvent-free polyurethane slurry, a preparation method thereof, and an application in vacuum grain-absorbing synthetic leather with hydrolysis resistance of 5-7 years. Background technique [0002] The development of the polyurethane synthetic leather industry in the direction of environmental protection, energy saving, and emission reduction has gradually become a trend. Among them, water-based polyurethane synthetic leather, solvent-free polyurethane synthetic leather, and TPU have gradually become new materials to replace traditional solvent-based polyurethane synthetic leather. Solvent-free polyurethane synthetic leather has gradually become a research hotspot in the synthetic leather industry due to its excellent physical properties, low energy consumption in production and processing, fewer production processes, and excellent environmental performance. [0003] ...

AI Technical Summary

Problems solved by technology

The two-component solvent-free polyurethane resin endows synthetic leather with a body-shaped cross-linked structure. Although it has excellent durability, it also has certain shortcomings: First, if the polyester-type two-component solvent-free polyurethane resin is used, the synthetic leather obtained It is also difficult to guarantee the hydrolysis resistance of the leather to be stable for more than 3 years; second, if the formed body has a high degree of crosslinking and the solvent-free polyurethane resin coating has a clear network structure, it is difficult to apply to the embossing process