Polyurethane resin on surface of PVC leather and preparation method thereof

Abstract

The invention discloses a preparation method for polyurethane resin on the surface of PVC leather. The preparation method mainly comprises the following steps: adding a certain amount of NPG polyol, isocyanate MDI and a solvent DMF into a reaction kettle, carrying out heating to 50-60 DEG C , and then performing a reaction for 0.5 to 1 h; then carrying out cooling to 35 DEG C or below, adding a certain amount of ethanolamine drop by drop, and continuing the reaction for 1 h; adding a certain amount of ethylene glycol and hydroxyl silicone oil, then carrying out heating to 70 to 75 DEG C, and performing a reaction for 2; and then, supplementing the isocyanate MDI, which is generally not more than 10% of a theoretical calculated amount, adjusting viscosity to 600-1200 CPS / 25 DEG C, and carrying out cooling and filtration so as to obtain a finished product. The polyurethane resin on the surface of PVC leather in the invention effectively solves the disadvantages that conventional polyurethane resin on the surface of the PVC leather has insufficient adhesion, a plasticizer is easy to precipitate and conventional polyurethane resin feels sticky and not dry enough.

Description

technical field [0001] The invention relates to a polyurethane resin on the surface of PVC leather and a preparation method thereof, in particular to a polyurethane resin with good adhesion on the surface of the PVC leather and a preparation method thereof. Background technique [0002] At present, leather products include luggage, clothing, shoes, etc., which have various surface forms and various styles of effects: high-gloss and high-solid, oily leather style, polishing style, crazy horse color change, yangbuck, etc., whether in surface effect, or in In terms of hand feel, or in terms of physical properties and quality of products, the effect of imitating genuine leather is still being pursued. [0003] Because of its good wear resistance and weather resistance, and relatively low cost, PVC leather occupies a large proportion in many leather varieties, and some large brands such as LV and COACH are widely used. However, PVC leather also has its limitations. Because in th...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention proposes a new polyurethane resin on the surface of PVC leather, which effectively solves the shortcomings of insufficient bonding force of polyurethane resin on the surface of PVC leather, easy precipitation of plasticizers, and sticky and not dry enough hand feeling.