10. Can reactive dyes be bathed with resin finishing agents? What is the process for implementing the dyeing and finishing steps? What are the advantages and disadvantages?
Answer: Reactive dyes can be put in the same bath as the resin finishing agent to implement one-step dyeing and finishing. However, different types of reactive dyes should be selected. The working fluids of dyes and resin finishing agents should have good stability and can adapt to high temperature fixation. Catalysts should be selected reasonably. According to information, domestic K-type reactive dyes and resin finishing agents can complete one-step dyeing and finishing under certain catalytic conditions. Conventional resin finishing uses organic acids or acidic salts as catalysts. Considering that reactive dyes are fixed under alkaline conditions, resin finishing agents also have certain cross-linking properties under alkaline conditions. Therefore, NaHC03 is recommended as a catalyst. Under high temperature conditions, NaHC03 can decompose to produce Na2CO3. According to the modern Lewis acid-base theory, a base is a molecule, atomic group or ion that can donate electron pairs, so Na2C03 is a weaker Lewis base, in Play a catalytic role in the reaction.
In order to prevent reactive dyes from oxidizing in the one-step dyeing and finishing process, add anti-dyeing salt S to the working solution, and also add neutral electrolyte (Na2S04 ) promotes dyeing and improves the dye uptake rate of reactive dyes.
One-step dyeing and finishing process flow: pre-treated fabric → padding working solution (two dips and two pads, room temperature, padding rate 70%) → pre-baking (80~90℃) → baking (150℃, 3min ) → Wash in hot water at 70～80℃ → Soap at 80℃ for 3 minutes → Wash twice in hot water at 70～80℃ → Wash in cold water → Dry
Working fluid prescription: Activated Deep Blue K-R10g/L, NaHC03 10g/L, Na2S04 30g/L, anti-staining salt S 1g/L, resin finishing agent 60g/L.
One-step dyeing and finishing method with reactive dyes and resin finishing agents is feasible. The advantage is that it saves labor and time, shortens the process by half, reduces energy consumption, increases output, saves costs, and has obvious economic benefits. The color of the product produced by the one-step method is slightly lighter than that of the two-step method, and the elasticity angle, elasticity, and shrinkage rate are slightly reduced (still meet the standards), but the breaking strength and color fastness all meet the two-step method indicators.
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