Method for preparing cationic poly(urethane-dimethyldiallylammonium chloride) color fixing agent

Abstract

The invention discloses a method for preparing a cationic poly(urethane-dimethyldiallylammonium chloride) color fixing agent, which comprises: synthesizing vinyl terminated cationic polyurethane prepolymer by using isocyanate, polyol, N-methyldiethanolamine and acrylate functional monomers as polymerization monomers; hydrating and dispersing the vinyl terminated cationic polyurethane prepolymer, and performing reversed emulsion polymerization of the vinyl terminated cationic polyurethane prepolymer and dimethyl diallyl ammonium chloride in a water soluble initiator to obtain the formaldehyde-free poly(urethane-dimethyldiallylammonium chloride) color fixing agent. The cationic poly(urethane-dimethyldiallylammonium chloride) color fixing agent contains no formaldehyde, retains the property of a polyurethane material, realizes the organic combination of the high performance of the two kinds of resins due to the high positive charge density of a poly(dimethyl diallyl ammonium chloride) chain segment and can effectively improve the color fastness of the dyed fabrics. When the color fixing agent is used, the color fastness of the fabrics dyed with direct dye and active dye is as follows: the dry friction fastness is grade 5, the wet friction fastness is grade 3 to 4, and the brushing fastness is 4 to 5.

Description

1. Technical field

[0001] The invention relates to a method for preparing a color-fixing finishing agent for textiles, in particular to a method for preparing a cationic poly(urethane-dimethyldiallylammonium chloride) color-fixing agent. 2. Background technology

[0002] In order to achieve the required color fastness indicators after textile dyeing, color fixing agents are usually used for color fixing. Both direct dyes and acid dyes have hydrophilic sulfonic acid groups and carboxylic acid groups in their structures, so the wet fastness of the dyes is low; and reactive dyes will also decrease the wet fastness due to insufficient hydrolysis or soaping. In order to improve the color fastness of fabrics, it is necessary to use a color-fixing agent for color-fixing treatment. For direct dyes and acid dyes, the color fixing agent Y (dicyandiamide formaldehyde resin) and color fixing agent M (copper-containing dicyandiamide resin) have the best color fixing effect, but the colo...

Examples

Embodiment 1

[0040] The specific synthesis operation method is as follows:

[0041] 1. Preparation of vinyl-terminated cationic polyurethane emulsion

[0042] Put 100kg of polyoxypropylene diol into the reactor, vacuum dehydrate at 100-120°C for 2h; then cool down to 50-60°C, add 35kg of toluene diisocyanate and 11kg of hydrophilic monomer N-methyldiethanolamine, at 70°C -75°C heat preservation reaction for 2h; under the condition of 65-70°C, slowly drop N-methyldiethanolamine butanone solution into the system, wherein the mass of N-methyldiethanolamine is 1.5kg, and the mass of butanone is 8kg, continue to react at 70-75°C after the dropwise addition, until the reaction stops when the NCO% is 2.5%, then add 8.5kg of β-hydroxyethyl acrylate and 0.1kg of inhibitor hydroquinone, at 80°C Insulation reaction 2h. In the reaction process, add methyl ethyl ketone 80kg when viscosity is bigger. After the reaction, cool down to 60°C, add 6.25kg of neutralizing agent acetic acid, stir for 30 minu...

Embodiment 2

[0048] The specific synthesis operation method is as follows:

[0049] 1. Preparation of vinyl-terminated cationic polyurethane emulsion

[0050] Put 100kg of polyoxyethylene diol into the reactor, vacuum dehydrate at 100-120°C for 2 hours; then cool down to 50-60°C, add 45kg of 1,6-hexamethylene diisocyanate and hydrophilic monomer N-formazol 16kg of N-methyldiethanolamine, heat preservation reaction at 75-80°C for 2h; cool down to 70°C, slowly add N-methyldiethanolamine butanone solution dropwise into the system, wherein the mass of N-methyldiethanolamine is 2.2kg, butanone The quality of ketone is 8kg, continues to react at 75-80 ℃ after finishing dropping, until NCO% is 3.2% when reaction stops, add acrylate-beta-hydroxypropyl ester 9kg and stopper Hydroquinone 0.1kg then, in The reaction was incubated at 80°C for 2h. In the reaction process, add methyl ethyl ketone 100kg when viscosity is bigger. After the reaction, cool down to 60°C, add 7kg of neutralizing agent acet...

Embodiment 3

[0056] The specific synthesis operation method is as follows:

[0057] 1. Preparation of vinyl-terminated cationic polyurethane emulsion

[0058] Put 100kg of polyoxypropylene-oxyethylene diol into the reactor, vacuum dehydrate at 100-120°C for 2 hours; then cool down to 50-60°C, add 50kg of toluene diisocyanate and 14kg of hydrophilic monomer N-methyldiethanolamine , keep the reaction at 70-80°C for 2h; cool down to 70°C, slowly add N-methyldiethanolamine butanone solution dropwise to the system, wherein the mass of N-methyldiethanolamine is 2kg, and the mass of butanone is 8kg After the dropwise addition, continue to react at 70-75°C until the reaction stops when the NCO% is 4.1%, then add 9.5kg of methacrylate-β-hydroxyethyl ester and 0.1kg of inhibitor hydroquinone, Under the insulation reaction for 2h. After the reaction, cool down to 60°C, add 9.1kg of neutralizing agent acetic acid, stir for 45 minutes, and add 300kg of water under high-speed stirring at 1400 rpm to 2...

1. Technical field

[0001] The invention relates to a method for preparing a color-fixing finishing agent for textiles, in particular to a method for preparing a cationic poly(urethane-dimethyldiallylammonium chloride) color-fixing agent. 2. Background technology

[0002] In order to achieve the required color fastness indicators after textile dyeing, color fixing agents are usually used for color fixing. Both direct dyes and acid dyes have hydrophilic sulfonic acid groups and carboxylic acid groups in their structures, so the wet fastness of the dyes is low; and reactive dyes will also decrease the wet fastness due to insufficient hydrolysis or soaping. In order to improve the color fastness of fabrics, it is necessary to use a color-fixing agent for color-fixing treatment. For direct dyes and acid dyes, the color fixing agent Y (dicyandiamide formaldehyde resin) and color fixing agent M (copper-containing dicyandiamide resin) have the best color fixing effect, but the colo...

Examples

Embodiment 1

[0040] The specific synthesis operation method is as follows:

[0041] 1. Preparation of vinyl-terminated cationic polyurethane emulsion

[0042] Put 100kg of polyoxypropylene diol into the reactor, vacuum dehydrate at 100-120°C for 2h; then cool down to 50-60°C, add 35kg of toluene diisocyanate and 11kg of hydrophilic monomer N-methyldiethanolamine, at 70°C -75°C heat preservation reaction for 2h; under the condition of 65-70°C, slowly drop N-methyldiethanolamine butanone solution into the system, wherein the mass of N-methyldiethanolamine is 1.5kg, and the mass of butanone is 8kg, continue to react at 70-75°C after the dropwise addition, until the reaction stops when the NCO% is 2.5%, then add 8.5kg of β-hydroxyethyl acrylate and 0.1kg of inhibitor hydroquinone, at 80°C Insulation reaction 2h. In the reaction process, add methyl ethyl ketone 80kg when viscosity is bigger. After the reaction, cool down to 60°C, add 6.25kg of neutralizing agent acetic acid, stir for 30 minu...

Embodiment 2

[0048] The specific synthesis operation method is as follows:

[0049] 1. Preparation of vinyl-terminated cationic polyurethane emulsion

[0050] Put 100kg of polyoxyethylene diol into the reactor, vacuum dehydrate at 100-120°C for 2 hours; then cool down to 50-60°C, add 45kg of 1,6-hexamethylene diisocyanate and hydrophilic monomer N-formazol 16kg of N-methyldiethanolamine, heat preservation reaction at 75-80°C for 2h; cool down to 70°C, slowly add N-methyldiethanolamine butanone solution dropwise into the system, wherein the mass of N-methyldiethanolamine is 2.2kg, butanone The quality of ketone is 8kg, continues to react at 75-80 ℃ after finishing dropping, until NCO% is 3.2% when reaction stops, add acrylate-beta-hydroxypropyl ester 9kg and stopper Hydroquinone 0.1kg then, in The reaction was incubated at 80°C for 2h. In the reaction process, add methyl ethyl ketone 100kg when viscosity is bigger. After the reaction, cool down to 60°C, add 7kg of neutralizing agent acet...

Embodiment 3

[0056] The specific synthesis operation method is as follows:

[0057] 1. Preparation of vinyl-terminated cationic polyurethane emulsion

[0058] Put 100kg of polyoxypropylene-oxyethylene diol into the reactor, vacuum dehydrate at 100-120°C for 2 hours; then cool down to 50-60°C, add 50kg of toluene diisocyanate and 14kg of hydrophilic monomer N-methyldiethanolamine , keep the reaction at 70-80°C for 2h; cool down to 70°C, slowly add N-methyldiethanolamine butanone solution dropwise to the system, wherein the mass of N-methyldiethanolamine is 2kg, and the mass of butanone is 8kg After the dropwise addition, continue to react at 70-75°C until the reaction stops when the NCO% is 4.1%, then add 9.5kg of methacrylate-β-hydroxyethyl ester and 0.1kg of inhibitor hydroquinone, Under the insulation reaction for 2h. After the reaction, cool down to 60°C, add 9.1kg of neutralizing agent acetic acid, stir for 45 minutes, and add 300kg of water under high-speed stirring at 1400 rpm to 2...

Images