Environment-friendly color-changing method of synthetic leather bass

Abstract

The invention discloses an environment-friendly color-changing method of synthetic leather bass, characterized by comprising the following steps: adding 100-300 parts by weight of aqueous urethane resin, 20-120 parts by weight of aqueous color paste, 0-9 parts by weight of thickener, 0-3 parts by weight of leveling agent and 0-3 parts by weight of crosslinker to a container with a stirrer; stirring at a room temperature for 25-30 minutes to prepare color-changing slurry; uniformly coating the color-changing slurry on a synthetic leather bass in sizing amount of 80-150g / m, at a drying temperature of 80-120 DEG C and at a drying speed of 15-20m / min; and then, adopting a rolling extrusion or plate extrusion mode to emboss, wherein the rolling extrusion is carried out under the pressure of 25-30MPa, at the temperature of 180-190 DEG C at the speed of 15-20min / min, and plate extrusion is carried out at the pressure of 15-18MPa, at the temperature of 80-90 DEG C and at the period of 3-5s. The method for preparing the color-changing layer and the bass has the advantages of excellent adhesion fastness, simple process, convenient operation, emission reduction and energy saving.

Description

technical field

[0001] The invention relates to an environment-friendly method for changing the color of synthetic leather bases, belonging to the field of synthetic leather production. Background technique

[0002] So far, polyurethane synthetic leather has become an indispensable main raw material for clothing, shoemaking, luggage, furniture and other industries due to its excellent comprehensive properties. The manufacturing process of polyurethane synthetic leather can be divided into two parts: the preparation of the base and the finishing. In the finishing process, the color change of the bass plays a vital role in the various properties (especially the appearance) of the finished leather. At present, the industry usually uses solvent-based polyurethane resin as the basic film-forming material for bass color change. This type of resin contains a large amount of toxic solvents such as toluene, xylene, acetone, butanone, ethyl acetate, and dimethylformamide. It is quit...