Environment-friendly solvent-free polyurethane for synthetic leather and manufacturing method of polyurethane

Abstract

The invention discloses environment-friendly solvent-free polyurethane for synthetic leather. The polyurethane comprises base cloth, a water-based surface layer, a water-based adhesive layer, a foaming layer and a functional auxiliary agent, wherein the water-based surface layer comprises water-based polyurethane emulsion, a thickening agent, a water-based defoaming agent, water-based color pasteand a leveling agent; the water-based adhesive layer comprises water-based polyurethane emulsion, a water-based polyurethane crosslinking agent and water-based color paste; the foaming layer comprisesa polyol compound, white carbon black, an organometallic catalyst, hydroxyl silicone oil, fatty acid, an organic amine catalyst, a filler and toluene diisocyanate; and the functional auxiliary agentcomprises sorbitol, maltitol, oligosaccharide, glycerin saturated fatty acid ester, a coloring agent and a surfactant. The environment-friendly solvent-free polyurethane for the synthetic leather is clean and environment-friendly; the foaming layer is free of an organic solvent, so that the polyurethane is more environment-friendly and environmental protection and sustainable development are facilitated; and meanwhile, the polyurethane has the relatively good toughness.

Description

technical field [0001] The invention belongs to the technical field of synthetic leather, and in particular relates to an environmentally friendly solvent-free polyurethane for synthetic leather and a manufacturing method thereof. Background technique [0002] Synthetic leather is a composite material that simulates the organization and performance of natural leather and can be used as a substitute for natural leather. Usually, non-woven fabric is used to simulate the mesh layer, and microporous polyurethane coating is used to simulate the grain layer. The front and back of the obtained synthetic leather are very similar to leather, and have a certain degree of air permeability, which is closer to natural leather than ordinary artificial leather. , Widely used in making shoes, boots, bags and ball games. [0003] At present, the manufacture of domestic synthetic leather mainly uses solvent-based polyurethane. Polyurethane contains a large amount of organic solvents. The con...

AI Technical Summary

Problems solved by technology

[0003] At present, the manufacture of domestic synthetic leather mainly uses solvent-based polyurethane. Polyurethane contains a large amount of organic solvents. The content of basic organic solvents is about 50-80%, and the components of organic solvents are mostly toluene, dimethylformamide, and ethyl acetate. , butanone, etc., during transportation and production, a certain amount of volatilization will escape to the external environment, affecting the environment and causing certain environmental problems