Polyurethane modified polyester resin toner and preparation method thereof
A technology of polyurethane modification and polyester resin, which is applied in the directions of developer, electrography, optics, etc. It can solve the problems of agglomeration of toner particles, easy to produce streaks, white spots, etc., and achieve improved stability and heat resistance offset effect
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[0050] The preparation method of the pigment emulsion is as follows:
[0051] 30g of carbon black (Cabot company), 7.5g of sodium lauryl sulfate and 62.5g of water were stirred and pre-dispersed at room temperature, and then the dispersion was added to a high-speed dispersant for dispersion, and after 2 hours of dispersion, the pigment was obtained The particle diameter of the emulsion is 182nm as measured by a nano particle size analyzer.
[0052] The preparation method of wax emulsion is as follows:
[0053] Stir and dissolve 30g of wax (behenyl behenyl behenate), 7.5g of sodium lauryl sulfate and 62.5g of water at 90°C, then quickly add this mixture into the high-speed dispersant for dispersion, and pass 2h The dispersion of milky white wax emulsion is obtained, and its particle diameter is 160nm as measured by a nano particle size analyzer.
Embodiment 1
[0054] Embodiment 1 A kind of preparation method of polyurethane modified polyester resin toner
[0055] S1. Introduce the following materials into a reactor equipped with a stirrer and a thermometer under nitrogen flow,
[0056]
[0057] Wherein, the composition molar ratio of the polyester resin is as follows, polyoxypropylene (2.2)-2,2-bis(4-hydroxyphenyl) propane: terephthalic acid: dodecenyl succinic anhydride: trimellitic anhydride = 110:50: 47:3, weight average molecular weight (Mw) = 26500, glass transition temperature (Tg) = 72°C, hydroxyl value = 9mgKOH / g.
[0058] After the above raw materials were mixed, the temperature was raised to 60° C. and stirred for 20 hours to obtain a polyurethane modified resin solution. After the polyurethane has formed and completed the reaction, the isocyanate content is zero.
[0059] S2. After the reaction in step S1 is completed, add 2 parts by mass of sodium lauryl sulfate, and then drop 500 parts by mass of ion-exchanged wate...
Embodiment 2
[0062] Embodiment 2 A kind of preparation method of polyurethane modified polyester resin toner
[0063] S1. Introduce the following materials into a reactor equipped with a stirrer and a thermometer under nitrogen flow,
[0064]
[0065] Wherein, the composition molar ratio of polyester resin is as follows, composition (molar ratio)=polyoxypropylene (2.2)-2,2-bis(4-hydroxyphenyl) propane: fumaric acid: dodecenyl succinic anhydride=102 :90:10, weight average molecular weight (Mw) = 8500, glass transition temperature (Tg) = 67°C, hydroxyl value = 8mgKOH / g.
[0066] After the above raw materials were mixed, the temperature was raised to 60° C. and stirred for 20 hours to obtain a polyurethane modified resin solution. After the polyurethane has formed and completed the reaction, the isocyanate content is zero.
[0067] S2. After the reaction in step S1 is completed, add 2 parts by mass of alkyl diphenyl ether disulfonate, and then uniformly drop in 750 parts by mass of ion-e...
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