Precautions must be taken when printing paint slurry

China Paint Online News Information

1. Water slurry preparationThe key to the preparation of paint slurry is the quality of adhesives, when modulation of dark slurry should be selected with high-quality adhesives with high solidity and then with hand-feel modulation agents that can increase the fastness, can ensure color fastness (friction fastness, soap wash fastness, wash fastness, etc.). The polymer particle diameter of high-quality adhesive should be controlled at 0.2um-1 um, and the particle size should be uniform. Summer due to dry weather, low humidity, water slurry prone to clogging phenomenon, in order to reduce the rate of water slurry drying, to prevent premature drying of the pulp, can be added in the pulp appropriate amount of moisture absorbent, to keep the surface of the slurry moisturizing, not skin, the general dosage of 3%, excessive moisture absorbent will affect the fastness. In the process of printing operation will often encounter this situation, at the beginning of printing, printing pulp flow is very good, but after running the general time of the pulp thickening, especially in the slurry with solid color, this happens because the printed flower area is small, the slurry stay in the net for a long time. The moisture in the slurry is volatile, the viscosity is 1, along with the poor mobility, and 5% ammonia is added to the pulp, which can solve the problem.。 2. Chemical fiber fabric printingprinting water slurry on chemical fiber fabric, because the coloring of the adhesive is weak on the chemical fiber fabric, if you want to obtain a satisfactory fastness, we must increase the coloring of the adhesive on the chemical fiber fabric. The practical method is to add a solid colorant, but because the solidizer and adhesive cross-linking effect, the product feel will harden, the choice of solid colorant is very important. If the solid colorant reaction is too slow, there is not much effect, if the reaction is too fast, it will damage the fluidity of the slurry, so that the printing slurry premature crosslinking, clogging phenomenon, should be selected not only with good solid color, but also high-quality slurry stability of the solid color agent.。 3. The problemdepth decrease and solidification in the colored brightness of the water slurry printing occurs. The depth of brightness is reduced because the slurry has the opposite effect on the color material, so the brightness is reduced. If improvements are desired, add 10%-15% white fire oil and an appropriate amount of emulsifying agent to the preparation of the slurry to ensure bright color. In the preparation of a good backup slurry, when adding color, there is a normal reaction, that is, a small amount of viscosity reduction. However, some color materials, especially black, the opposite situation occurs, the formation of slurry solidification, viscosity rises to the normal use. The suitable amount of ammonium sulfate can be added to the solidified slurry to improve the coagulation of the slurry.
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