Preparation technology of water-based PU (Polyurethane) glue substituting solvent type printing ink TPU (Thermoplastic Polyurethane)

Abstract

The invention relates to a preparation technology of water-based PU (Polyurethane) glue substituting solvent type printing ink TPU (Thermoplastic Polyurethane). The technology is characterized by comprising the following steps: slowly stirring 24-30% of acrylic resin in a dispersion tank at normal temperature and pressure state, adding ammonium hydroxide for regulating the pH value to 7-8; sequentially feeding a polyurethane aqueous dispersion, propylene glycol monomethyl acetate, ethylene glycol butyl ether and the like into the dispersion tank, and continuously dispersing for one hour; after the dispersion is over, heating, continuously vacuumizing the tank through a vacuum pump, injecting cooling circulation water to the outer wall of the dispersion tank under the condition that the pressure in the tank is maintained at the negative pressure state of 0.8-1Pa, cooling the temperature to 50DEG C below, releasing the negative pressure in the tank to be normal pressure, filtering through a vacuum filtering machine, to obtain the printing ink TPU water-based PU glue. The product can be used as a printing ink in the ink printing technology of a TPU shoe material. Furthermore, no pollutant solvent is volatized in the process of drying shoe shell fabric using the water-based PU glue, and patterns are colorful.

Description

technical field [0001] The invention relates to a process for preparing water-based PU glue, in particular to a process for preparing water-based PU glue that replaces solvent-based ink TPU. Background technique [0002] The Chinese name of TPU is thermoplastic polyurethane elastomer. It is a polymer material with excellent high tension, high tensile strength, toughness and aging resistance. It is a mature environmental protection material. At present, TPU materials are widely used in automobile manufacturing, home appliance manufacturing, transportation, civil engineering, shoe materials, synthetic leather and other fields. [0003] TPU material has been widely used in the field of shoe materials. Because of its good cushioning performance, light weight, wear resistance, and anti-skid, it has become an important supporting material in the shoe material industry. [0004] Shoe material ink refers to the coating ink used on the sole, also called sole paint. As one of many i...

AI Technical Summary

Problems solved by technology

Although most of the organic solvents can be removed by drying, but because the pigment particles in the ink are very fine and have strong adsorption capacity, coupled with the short heating and drying time, the drying is often not complete, especially when the ink area is large, Prints with a thicker ink layer have more residual solvents, which are more difficult to release after compounding

Moreover, the residual solvent will slowly migrate and infiltrate, causing pollution to materials and endangering people's health.

At the same time, the color of traditional solvent-based TPU ink is single during use, which greatly limits the flexibility of its application.

Therefore, the existing solvent-based ink TPU has the problem of pollution to the environment, and the problem of single color during use

In addition, the shoe fabrics using solvent-based ink TPU glue will have solvent pollutants volatilized during the drying process, so it needs to be changed