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Discussion on textile printing process with color changing function
Release time:2017-07-13      Clicks:1348

Textile printing color features can also be called Shadow textile printing, is to make the textile pattern color with the ambient temperature changes, illumination changes, fabric of dry and wet change, caused by the change of pattern and color function also flickering. That is, the pattern on the fabric changes from conventional "static" to "strange and dynamic", and the change of its color is generally reversible. Textile printing technology is the color features of modern high-tech materials printed in textiles, the color features of the textile can be made into summer clothes, towels, clothes, actors work clothes, beach pants, swimwear, clothing, T-shirt, T umbrella, poncho, curtains etc.. When people wear or use, they feel the vagaries of fun, to achieve a unique dynamic effect.


Textile printing color features the thermochromic printing function (warm color printing), photosensitive color printing function (color printing), printing function and Yang floating water color white printing.


Thermochromic printing


Thermochromic functional printing (warm color printing), is a typical representative of shadow printing, fabric printing thermochromic functional pattern color is changed with temperature and change at the same time, with the temperature change of inorganic and organic materials can be divided into two categories, is used for temperature discoloration is mostly used in textiles organic photochromic material.


1, heat sensitive color principle


Heat sensitive color printing on textiles is now using thermosensitive color change coating, that is to change the heat sensitive organic dyes into microcapsules, and then use the coating printing process to print onto the fabric. Thermochromic organic dyes have two types of reversibility and irreversibility. They are generally reversible in textiles. Thermochromic organic dye by leuco dye, coloring agent and dry agent (Jian Minji) of three parts, the leuco dye is some combination of the proton can color the material, like lactones in the color system, as for electronic parts. Chromogenic agent is a reversible release of proton acid compounds, that is, electronic compounds.


For example: the leuco dye crystal violet lactone, and chromogenic agent for bisphenol A color system, in a certain medium, when reduced to a certain temperature, bisphenol A release protons, which are electronic, crystal violet lactone ring opening, molecular rearrangement, conjugated double bond and bisphenol A through ion binding, and showing the color from. The apparent color with the substituents R and X is different, when the temperature rises to a certain, chromogenic agent bisphenol A combined with proton, then the leuco dye crystal violet lactone structure that is turned into separate, closed loop, and bisphenol A is colorless color disappeared. Leuco dye and color reagent color system must be in a special solvent in color effect can be achieved, such solvent melt of leuco dye and chromogenic agents have good solubility, and can enhance the system's sensitivity to heat, it is known as the sensitizing agent (Jian Minji).

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