Using PRECAUTIONS For Dye-Fixing Agent in the Process of Water Slurry Printing
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1. Water Slurry Preparation
the key for preparing water slurry is the adhesive agent.When we prepare dark color slurry, we should choose high solid good adhesive agent, and matching with hand-feeling modulating agent to increase the fastness, which will ensure the color fastness(colorfastness, soaping fastness, rubbing fastness). The diameter of good adhesive agent particle should be 0.2um-1.0um, with even granular size.
With dry weather and low humidity in summer, the water slurry is easy to block. In order to decrease the water slurry drying speed, and prevent the premature drying, we can add some hygroscopic agent into the water slurry. And keep the wetting of water slurry surface. We usually add 3% hygroscopic agent. If excess, the hygroscopic will influence the fastness. In the printing operation process, we often meet the following situation: at the beginning of printing, water slurry’s fluidity is very good, but after a period of time, water slurry become thick, especially in the slurry with dye fixing agents. This happens because of the smaller size of the printed pattern, dye stays in the network for a long time . With the water evaporation, the viscosity increase, and the fluidity is poor. If we add corresponding additives, the problem will be solved.
2. Printing in Chemical Fabric
When we print water slurry on the chemical fabric, because of the weak staining ability of adhesive agent on the chemical fabric, we need to increase the staining degree of the adhesive agent on the chemical fabric to reach the fastness requirement.By adding dye-fixing agents, we can achieve the goal. But owing to the crosslinking between adhesive agent and dye-fixing agents, the hand feeling of fabric will become hard. So the choose of dye-fixing agents become important. If the dye fixing agents' reaction is slow, we can not reach the effect, If too fast, the slurry mobility will lower. The water slurry will crosslink earlier than it should be. The blocking phenomenon will occur. So we need to choose the dye-fixing agents with good fastness and stability.
3. Color Brightness
The color brightness decrease and solidification is the common problem in the process of water slurry printing. The color brightness decrease is caused by the opposite effect of water slurry on the dye. If we want to improve the color brightness, we need to increase 10%-15% printing water and dye-fixing agents when we prepare water slurry. Thus, we can ensure the color brightness. Normally, when we add dye into the prepared water slurry, the reaction is normal. But for some dye, especially, black dye, the contrary opposite phenomenon will appear. That is , the water slurry will solidify until it can not be used anymore. At this time, we need to add the corresponding auxiliary to the water slurry and improve the solidity.
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