Preparation method of acrylic acid modified water-based polyurethane dispersion for metal coating
A water-based polyurethane and metal coating technology, applied in the coating and other directions, can solve the problems of delamination, acrylic acid and water-based polyurethane dispersion cannot be well copolymerized, and the hardness of the copolymerized product is not good in salt spray resistance. The effect of stable performance, excellent acid resistance, good hardness and mechanical strength
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Embodiment 1
[0023] Example 1: 0.4 mol of isophorone diisocyanate was added dropwise to a mixed solution of 0.05 mol of polyglycerol and 0.05 mol of polycaprolactone diol, 0.3 g of stannous octoate was added as a catalyst, and reacted at 85° C. for 2 h to obtain White viscous polyurethane prepolymer. Add 0.1mol ethylene glycol, 0.02mol trimethylolpropane and 0.08mol dimethylolpropionic acid to the prepolymer, and after chain extension reaction at 85°C for 0.5h, add 0.18mol hydroxyethyl acrylate to react for 0.5h , add 0.08mol triethylamine to neutralize, add 350ml deionized water to prepare aqueous polyurethane dispersion. Prepare a mixture of 0.4mol methyl methacrylate, 0.3mol n-butyl acrylate, 0.1mol acrylic acid, and 2.0g oleic acid diethanolamide, prepare 1g of ammonium persulfate in water, and pour it into the aqueous polyurethane dispersion at 90°C The mixed solution and ammonium persulfate aqueous solution were added dropwise, and after the dropwise addition, the temperature was ra...
Embodiment 2
[0024] Example 2: 0.4 mol of isophorone diisocyanate was added dropwise to a mixed solution of 0.05 mol polytetrahydrofuran diol and 0.05 mol polycarbonate diol, 0.3 g of stannous octoate was added as a catalyst, and reacted at 80° C. for 3 h to obtain White viscous polyurethane prepolymer. Add 0.15mol 1,6-hexanediol and 0.08mol dimethylol butyric acid to the prepolymer, after chain extension reaction at 80°C for 1h, add 0.14mol hydroxyethyl acrylate to react for 0.5h, add 0.08mol triethylamine And, add 400ml of deionized water to prepare an aqueous polyurethane dispersion. Prepare a mixed solution of 0.6mol methyl methacrylate, 0.4mol n-butyl acrylate, 0.1mol acrylic acid, and 2.0g polyether phosphate salt, prepare an aqueous solution of 1.2g ammonium persulfate, and pour it into the aqueous polyurethane dispersion at 80°C At the same time, the mixed solution and the ammonium persulfate aqueous solution were added dropwise, and after the dropwise addition was completed, the ...
Embodiment 3
[0025] Example 3: 0.4 mol of isophorone diisocyanate was added dropwise to a mixture of 0.08 mol of polyglycerol and 0.03 mol of polycarbonate diol, 0.3 g of stannous octoate was added as a catalyst, and reacted at 95° C. for 1 h to obtain a white Viscous polyurethane prepolymer. Add 0.1mol ethylene glycol, 0.02mol trimethylolpropane and 0.09mol dimethylolpropionic acid to the prepolymer, after chain extension reaction at 82°C for 0.6h, add 0.14mol hydroxyethyl acrylate to react for 0.5h, Add 0.1 mol of triethylamine for neutralization, and add 450 ml of deionized water to prepare an aqueous polyurethane dispersion. Prepare a mixed solution of 0.5mol methyl methacrylate, 0.8mol n-butyl acrylate, 0.2mol acrylic acid, and 4.0g polyether phosphate salt, prepare an aqueous solution of 1.2g ammonium persulfate, and pour it into the aqueous polyurethane dispersion at 90°C At the same time, the mixed solution and the ammonium persulfate aqueous solution were added dropwise, and afte...
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