Printing thickeners are one of the most commonly used thickeners in the printing industry. In printing, the two main materials used are glue and color paste. And because the consistency will decrease under higher shearing force, thickeners are used to increase the consistency of printing materials, and printing thickeners are needed at this time.
The main function of the printing thickener is to provide good rheological properties, transfer the glue or color paste on the printing screen and printing roller to the fabric, so that the dye and fiber are combined together to ensure the clear printing pattern. The pattern is clear and the color is bright and uniform; when the dye is fixed, the reaction products and residues are easily removed in the downstream process, making the fabric feel soft. This shows that printing thickeners play a very important role in the printing industry.
Disperse printing thickener is a cross-linked polymer composite emulsion thickener. After being diluted and neutralized with water, the water-based polymer particles will expand rapidly. In this case, the printed product will become very clear and sticky. The disperse printing thickener can effectively increase the low shear viscosity of the printing system and make the printing system have a higher pseudoplasticity. The dye printing prepared with the dispersion printing thickener as the main thickener has a higher yield value and gel structure. This structure does not appear until the shear force disappears. Therefore, the dispersion printing thickener is suitable for preparing printing with moderate three-dimensional pattern effect.
Printing thickeners have a long history of development. The size used a long time ago was starch or modified starch. This kind of thickener is called a natural thickener, but this kind of printing thickener has high cost, low color depth, poor vividness, poor washing fastness, and unsatisfactory fabric texture. At present, this kind of thickener has been phased out. It was not until the 1950s that people introduced a national pulp, which enabled the printing technology to be widely used. Using kerosene and water as raw materials, it undergoes high-speed emulsification under the action of emulsifiers to form a state slurry thickener. Because the thickener contains kerosene above 50 # and the amount is large, it will cause serious pollution to the atmosphere and have the risk of explosion. In addition, the consistency of the printing paste is not easy to adjust, and the kerosene smell will remain on the fabric after printing. So people are still not satisfied with this printing thickener. In the 1970s, people began to develop and produce synthetic thickeners. The emergence of synthetic thickeners has greatly promoted the development of printing production and raised printing technology to a new level. It solves environmental pollution and safety issues. Moreover, the synthetic thickener has the advantages of good thickening effect, convenient transportation and storage, simple preparation, clear outline, bright color and the like.
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