A kind of preparation method of quaternary ammonium salt chitosan and organosilicon composite modified cationic water-based polyurethane color fixing agent
A technology of quaternary ammonium chitosan and water-based polyurethane, which is applied in the field of color-fixing agents, can solve the problems of poor thermal stability, poor water resistance, and poor gloss, and achieve the effect of no effect on color and good hand feeling
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Embodiment 1
[0027] A kind of preparation method of quaternary ammonium salt chitosan and organosilicon compound modified cationic water-based polyurethane color fixing agent, comprises the following steps:
[0028] Add 20.0 g of polyoxypropylene diol (N220) into the reaction vessel, mix and stir, heat at a constant temperature in an oil bath at 90°C, vacuumize and dehydrate for 1 h, the vacuum degree is 0.098MPa, cool down to 80°C, and add 11.1 g of IPDI , 1.94 g of hydroxypropyltrimethylammonium chloride chitosan and 0.15 g of di-n-butyltin dilaurate, and 1.2 g of nitrogen-methyl glycol amine (diluted with acetone to a mass fraction of 35%) was added dropwise until the system The prepolymer was obtained when the NCO value basically reached the theoretical value. The theoretical R value was 1.56. Then the temperature was lowered to 60°C, and 1.55 g of 3-aminopropyltrimethoxysilane (KH540) was added. After the end-capping reaction was complete, the theoretical R The value is 1.20. Cool th...
Embodiment 2
[0033] A kind of preparation method of quaternary ammonium salt chitosan and organosilicon compound modified cationic water-based polyurethane color fixing agent, comprises the following steps:
[0034]Add 20.0 g of polyoxypropylene diol (N220) into the reaction vessel, mix and stir, heat at a constant temperature in an oil bath at 90°C, and vacuum dehydrate for 1 h with a vacuum degree of 0.098 MPa. Cool down to 80°C, add 11.1 g IPDI, 1.29 g carboxymethylhydroxypropyltrimethylammonium chloride chitosan and 0.15 g di-n-butyltin dilaurate, drop 1.2 g nitrogen-methyl glycol amine (with Diluted with acetone to 35% by mass), until the NCO value in the system basically reached the theoretical value, the prepolymer was obtained, and the theoretical R value was 1.78, then the temperature was lowered to 60°C, and γ-aminopropyltriethoxysilane ( KH550) 1.89 g, with a complete capping reaction and a theoretical R value of 1.20. Cool the oil bath to 40°C, dilute with acetone (about 3-5 g...
Embodiment 3
[0039] A kind of preparation method of quaternary ammonium salt chitosan and organosilicon compound modified cationic water-based polyurethane color fixing agent, comprises the following steps:
[0040] Add 20.0 g of polyoxypropylene diol (N220) into the reaction vessel, mix and stir, heat at a constant temperature in an oil bath at 90°C, and vacuum dehydrate for 1 h with a vacuum degree of 0.098 MPa. Cool down to 80°C, add 11.1 g IPDI, 0.81 g hydroxypropyltrimethylammonium chloride chitosan and 0.15 g di-n-butyltin dilaurate, dropwise add 1.2 g nitrogen-methyl glycol amine (diluted with acetone to The mass fraction is 35%), until the NCO value in the system basically reaches the theoretical value, the prepolymer is obtained, the theoretical R value is 2.00, then the temperature is lowered to 60°C, and N-β-(aminoethyl)-γ-aminopropyl is added 2.15 g of methyldimethoxysilane (KH602), with a complete capping reaction, and a theoretical R value of 1.20. Cool the oil bath to 40°C,...
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