1. Determination of method. Although the composition thickener can be compatible with acrylate adhesives, they have a wide variety. Therefore, it is necessary to select the compatible components, materials and methods according to local conditions, and also consider the printing equipment, printed fabrics and other factors to select the process.
2. One step or two-step method can be selected according to different situations. The one-step method is to prepare the color paste directly and thicken it after printing. It is suitable for round screen printing of machine printed manuscript. The two-step method is to make the thickener into a slurry similar to the emulsion slurry in advance, and then operate according to the conventional color matching, which is suitable for small batch Ping'a printing and manual platen printing.
3. Generally, no catalyst is added. As the composition thickener releases ammonia from the polymer during baking, leaving free polyacrylic acid, it produces the acidic conditions required for coating fixation. If the viscosity of the color paste decreases due to the need of adding catalyst or accidentally encountering electrolyte in the process, the thickener can be added, and the viscosity can be restored.
4. Gel problem. In particular, the black reaction of the coating is significant, and it also occurs when the dosage of a single coating slurry is more than 809 / L, which is the deficiency of the thickened slurry. The low viscosity composition thickener alcoprintpth of British colloid company can solve the problem of gel. At present, it is safer to choose galactized pulp in China.
5. Infiltration. The phenomenon of "color halo" in all aqueous pigment printing due to swimming before drying is more significant in blended and filament fabrics, which is related to the high water content in the color paste. Properly increasing the amount of thickener and adding additives such as silicone oil with low HLB value can basically overcome the occurrence of infiltration. Of course, the coordination of printing equipment and operation is also very important.
Article source: Jiangmen printing paste www.peterawolf.com
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