Preparation method for transference resistance leather dye
A migration-resistant, leather-based technology that is applied in dyeing, organic dyes, textiles, and papermaking. It can solve the problems of poor color fastness of leather, casein resistance to light, and migration resistance, and achieve good color and transparency. , easy control of functionality, and stable performance of dyes
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[0031] The preparation process of the migration resistant leather polymer dye of the present invention is as follows:
[0032] Add a metered amount of isocyanate, polyol and catalyst into the reaction kettle, wherein the molar ratio of isocyanate to polyol is 1:0.10~0.50, preferably 1:0.15~0.45, and the catalyst is 0.02%~ of the total weight of isocyanate, polyol and reactive dye. 0.06%, preferably 0.03%-0.05%, stirred and reacted at 60-90°C for 60-180min, preferably 70-80°C, 90-130min, to form polyurethane prepolymer; add a suitable amount of solvent to adjust the viscosity of the reactant, the amount of solvent is isocyanate, The total weight of polyol and reactive dye is 50%-100%; when reactive dye is added, the molar ratio of isocyanate to reactive dye is 1:0.65~0.90, preferably 1:0.70~0.80, and the reaction is stirred at 60~95℃ for 60~180min , Preferably 75~90℃, 90~150min; adding chain extender, the molar ratio of isocyanate to chain extender is 1:0.10~0.60, preferably 1:0.2...
Example Embodiment
[0034] Example 1
[0035] Add 672.8kg HDI, 2000kg polypropylene glycol 2000, 2.01kg dibutyltin dilaurate to the reaction kettle, stir and react at 75℃ for 120min to form polyurethane prepolymer; add 4000kg N,N-dimethylformamide and stir evenly; add 1145.5kg Reactint-Black X41LV (hydroxyl value: 137), react at 90°C for 120min, then add 212.7kg of hexanediol, react at 80°C for 60min; then add 2515kg N,N-dimethylformamide dropwise to obtain a solid content of 38.22 % Of migration resistant leather dyes.
Example Embodiment
[0036] Example 2
[0037] Add 1111.5kg of IPDI, 1500kg of polypropylene glycol 1500, 1.71kg of dibutyltin dilaurate to the reactor, stir and react at 80℃ for 90min to form polyurethane prepolymer; add 3500kg of tetrahydrofuran and stir evenly; add 1468.9kg of reactint-red X64 (Hydroxyl value: 180), react at 80°C for 150min, then add 188.5kg 2-aminoethylethanolamine, react at 75°C for 50min; add 3000kg tetrahydrofuran dropwise to obtain a migration-resistant leather dye with a solid content of 39.64%.
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