Ink printing pretreatment solution

Abstract

The invention discloses a pretreatment solution for pretreating a textile before ink printing, which contains water, alkali earth metal ionic compound and crosslinkable polyurethane, wherein the glass transition temperature of the crosslinkable polyurethane particles is lower than -20 DEG C, the particle size obtained by a light scattering process is greater than 300nm and smaller than 800nm, and the crosslinking degree for high-polymer particles (tetrahydrofuran insoluble substances, residue level) at 25 DEG C is higher than 40%. The pretreatment solution can enable the printing chroma of the textile to reach 50 or so, which is 25% higher than the prior art. Meanwhile, by using the pretreatment solution, the adhesive force of the ink on the textile is increased, and the ink spraying stability of the sprayer is higher.

Description

technical field [0001] The invention relates to a pretreatment liquid, in particular to an ink printing pretreatment liquid, in particular to a pretreatment liquid used for pretreatment of the cloth before the ink is printed and dyed on the cloth. Background technique [0002] At present, inkjet printing and dyeing is more and more widely used, and its application fields include paper printing, plant printing, special material printing, etc. Ink is a uniform mixture composed of colored bodies (such as pigments, dyes, etc.), linking materials, filling (filling) materials, additional materials, etc. It can be printed and dried on the printed body. It is colored and has a certain flow. Degree of paste-like adhesive body. Therefore, color (hue), body (rheological properties such as thinness and fluidity) and drying performance are the three most important properties of ink. There are many types of inks, and their physical properties are also different. Some are very thick and ...

AI Technical Summary

Problems solved by technology

However, there are certain defects in the inkjet printing and dyeing of fabrics: in the case of inkjet printing and dyeing, due to the problem of ejection, the viscosity of the ink is usually as low as 10mPa·s or less, or the function of the fabric to quickly absorb ink and fix it is insufficient, so In order to prevent bleeding of the printed matter after printing, pre-treatment is generally performed on the fabric in advance

[0007] All of the methods mentioned above are aimed at preventing image bleeding and obtaining vivid dyeings at high concentrations, but they have not yet achieved color density and vividness comparable to dyeings obtained by conventional screen printing methods.