Solvent-free polyurethane resin used for sofa leather middle foaming layer and preparation method thereof

Abstract

The invention discloses solvent-free polyurethane resin used for a sofa leather middle foaming layer and a preparation method thereof. The solvent-free polyurethane resin is formed by mixing componentA and component B according to the mass ratio of (1: 2) to (2: 1). The solvent-free polyurethane resin prepared in the invention does not contain any solvent, synthetic leather prepared as a middle layer is green, environmentally-friendly, soft and plump in hand feel, the physical performance can reach one hundred thousand times of bending at normal temperature without cracking, eighty thousand times of bending at the cold-resistant temperature of -10 DEG C without cracking, the peeling strength is more than 50 N / 3cm, and the retention rate of the peeling strength for 5 to 7 weeks under the constant temperature and humidity conditions of 70 DEG C and 95% humidity can reach 75%.

Description

technical field

[0001] The invention belongs to the field of functional polyurethane synthetic leather, and in particular relates to a solvent-free polyurethane resin for a middle foam layer of sofa leather with soft and plump hand feeling and a preparation method thereof. Background technique

[0002] As a new multifunctional polymer material, polyurethane occupies an important position in the material industry, and has now developed into one of the world's six major synthetic materials. Among them, solvent-based polyurethane is widely used in the field of synthetic leather and gradually replaces PVC artificial leather. The wet process uses the solvent in the polyurethane resin to replace it with water. Because the polyurethane resin is insoluble in water and cannot form a homogeneous phase, it is condensed and formed; in addition, after the solvent is replaced by water Drying forms a loose and porous structure, which makes the hand feel soft and plump, which is closer to g...

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