Self-dispersing polyurethane acrylate aqueous copolymer, preparation method and aqueous emulsion made thereof
A polyurethane acrylate and polyacrylate technology, applied in the field of water-based coatings, can solve the problems of film phase separation and reduce the performance of emulsions, and achieve the effects of large cohesion, high oxidation resistance and elongation at break, and safe production.
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Embodiment 1
[0040] Preparation of polyurethane prepolymer: polyether N210 (molecular weight: 1000) was vacuum-dried in a vacuum oven at 120° C. to remove water for 4 hours. According to the weight ratio, add 100 parts of dehydrated polyether N210 into the reactor equipped with a stirrer and a thermometer, raise the temperature to 50°C, then add 12 parts of toluene diisocyanate, mix evenly under the condition of stirring, and heat up to 70°C , to obtain polyurethane prepolymer PU1 after reacting for 7 hours.
[0041] Preparation of polyacrylate prepolymer solution: by weight, add 60 parts of isobutyl methacrylate, 10 parts of hydroxyethyl methacrylate, 30 parts of Methacrylic acid, 100 parts of toluene, and 2 parts of azobiscyclohexylcarbonitrile were stirred and mixed uniformly, and the temperature was raised to 80°C for 15 hours to prepare a polyacrylate prepolymer PA1 solution.
[0042] Preparation of polyurethane acrylate aqueous copolymer: put 20 parts by weight of PU1 in the reactor...
Embodiment 2
[0046] Embodiment 2: the preparation of polyurethane acrylate aqueous polymer
[0047] Preparation of polyurethane prepolymer: polyether N220 (molecular weight: 2000) was vacuum-dried in a vacuum oven at 120° C. to remove water for 4 hours. According to the weight ratio, add 100 parts of dehydrated polyether N220 into the reactor equipped with a stirrer and a thermometer, raise the temperature to 65°C, then add 50 parts of diphenylmethane diisocyanate, mix evenly under the condition of stirring, and raise the temperature to 80° C. and react for 3 hours to obtain polyurethane prepolymer PU2.
[0048] Preparation of polyacrylate prepolymer solution: by weight, add 90 parts of isooctyl methacrylate, 5 parts of hydroxypropyl methacrylate, 5 parts of Acrylic acid, 100 parts of xylene, and 3 parts of azobisisoheptanonitrile were stirred and mixed uniformly, and the temperature was raised to 100°C for 10 hours to prepare a polyacrylate prepolymer PA2 solution.
[0049] Preparation ...
Embodiment 3
[0053] Embodiment 3: the preparation of polyurethane acrylate aqueous polymer
[0054] Preparation of polyurethane prepolymer: polyether PEG300 (molecular weight: 300) was vacuum-dried in a vacuum oven at 120° C. to remove water for 4 hours. According to weight ratio, add 100 parts of dehydrated polyether PEG300 into a reactor equipped with a stirrer and a thermometer, raise the temperature to 60°C, and then add 15 parts of isophorone diisocyanate and 15 parts of xylylene diisocyanate , mixed evenly under the condition of stirring, heated up to 75° C., and reacted for 5 hours to obtain polyurethane prepolymer PU3.
[0055] Preparation of polyacrylate prepolymer solution: by weight, add 70 parts of propyl methacrylate, 8 parts of 4-hydroxybutyl acrylate, 22 parts of methyl Base acrylic acid, 100 parts of dioxane, 2.5 parts of azobisisovaleronitrile, stir and mix evenly, heat up to 90°C and react for 12 hours to prepare polyacrylate prepolymer PA3 solution.
[0056] Preparatio...
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