Amphiphilic polymer pigment dispersant for water paint
A technology of amphiphilic polymer and pigment dispersant, which is applied in the direction of pigment slurry and latex paint, etc., can solve the problems of unsatisfactory dispersion effect and achieve the effect of bright color, easy operation and uncomplicated preparation process
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[0080] Example 1
[0081] Add 300 grams of methyl methacrylate, 240 grams of tert-butyl methacrylate, 60 grams of hydroxyethyl methacrylate, 200 grams of toluene, and 200 grams of butyl acetate into a 2-liter three-necked flask, install a condenser tube, and add to the flask. High-purity nitrogen was passed through the mixture for 2 hours. Then, 36 mg of chain transfer agent (COPhBF) and 3 g of initiator azobisisobutyronitrile were added to the three-necked flask under nitrogen atmosphere. The system was reacted in a constant temperature water bath at 70-80°C for 6-10 hours under a nitrogen atmosphere. A light yellow viscous macromonomer solution was obtained, and after removing the solvent, a light yellow solid was obtained, the number average molecular weight Mn=860, the molecular weight distribution PDI=1.6, and the conversion rate was 80%.
Example Embodiment
[0082] Example 2
[0083] Add 40 grams of methyl methacrylate, 160 grams of tert-butyl methacrylate, 150 grams of toluene and 150 grams of butyl acetate to a 1-liter three-necked flask, install a condenser, and pass high-purity nitrogen into the mixture for 2 hours . Then, 6 mg of chain transfer agent (COPhBF) and 1 g of initiator azobisisobutyronitrile were added to the three-necked flask under nitrogen atmosphere. The system was reacted in a constant temperature water bath at 70-80°C for 6-10 hours under a nitrogen atmosphere. A light yellow viscous macromonomer solution was obtained, and a light yellow solid was obtained after removing the solvent, the number average molecular weight Mn=6100, the molecular weight distribution PDI=1.75, and the conversion rate was 95%.
Example Embodiment
[0084] Example 3
[0085] 98 grams of the macromonomer obtained in Example 1 and 33 grams of butyl acrylate were added to a 500-ml three-necked bottle, and then 1.3 grams of azobisisobutyronitrile and 130 grams of toluene were added. Then react in a constant temperature water bath at 70-80°C for 6-10 hours. Then, the solvent was distilled off with a rotary evaporator to obtain a light yellow solid, the number average molecular weight Mn=1300, the molecular weight distribution PDI=1.78, and the conversion rate was 100%. Add 150 grams of dioxane and 90 grams of concentrated hydrochloric acid, and react in a constant temperature water bath at 80 to 90°C for 10 to 17 hours. The solvent was evaporated with a rotary evaporator, and an aqueous solution of sodium hydroxide was added to dissolve to obtain an aqueous solution of a graft-type amphiphilic polymer dispersant.
[0086] Wetting and dispersion test of this dispersant:
[0087] 1. Dispersion of carbon black
[0088] Carbon...
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