Nanometer CaCO3/nanometer SiO2 double modified waterborne polyurethane coating and preparation method thereof
A technology of waterborne polyurethane and double modification, applied in the field of coatings, can solve the problems of poor mechanical properties and low adhesion, and achieve the effects of low wear resistance, low toxicity and cost reduction
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Embodiment 1
[0045] Example 1: Nano CaCO 3 / Nano SiO 2 Double modified waterborne polyurethane coating (nano CaCO 3 The mass ratio to the total amount is 5:50, nano SiO 2 The mass ratio to the total amount is 5:50)
[0046] (1) Nano CaCO 3 / Nano SiO 2 Synthesis of dual modified waterborne polyurethane emulsion:
[0047] Under the protection of nitrogen, add 173.8g of polytetrahydrofuran ether glycol 2000 and 229.5g of methylcyclohexyl diisocyanate into the reaction kettle, raise the temperature to 85°C, mix well, add 4g of dibutyltin dilaurate, and react for 2h After that, a polyurethane prepolymer is obtained. Add 50g nano CaCO 3 , Stir for 2h. The temperature was lowered to 75°C, 33.6g of butyl ethyl propylene glycol was added, and the reaction was carried out for 1 h. Cool down to 60°C, then add 31.2g of dicarboxy half ester, react for 2h, add acetone to reduce the viscosity until the solution is colorless. Then add 17.8g of glycerin and react for 2h. The temperature was lowered to 25°C,...
Embodiment 2
[0050] Example 2: Nano CaCO 3 / Nano SiO 2 Double modified waterborne polyurethane coating (nano CaCO 3 The mass ratio to the total amount is 7:50, nano SiO 2 The mass ratio to the total amount is 17:50)
[0051] (1) Nano CaCO 3 / Nano SiO 2 Synthesis of dual-modified waterborne polyurethane emulsion: under the protection of nitrogen, add 173.8g of polypropylene glycol 2000, 229.5g of methylcyclohexyl diisocyanate into the reaction kettle, raise the temperature to 85°C, mix well, add 4g of dilaurel After reacting with dibutyl tin acid for 2 hours, a polyurethane prepolymer is obtained. Add 70g nano CaCO 3 , Stir for 2h. The temperature was lowered to 75°C, 33.6g of butyl ethyl propylene glycol was added, and the reaction was carried out for 1 h. Cool down to 60°C, then add 31.2g of dicarboxy half ester, react for 2h, add acetone to reduce the viscosity until the solution is colorless. Then add 17.8g of glycerin and react for 2h. The temperature was lowered to 25°C, and 14.1 g of...
Embodiment 3
[0054] Example 3: Nano CaCO 3 / Nano SiO 2 Double modified waterborne polyurethane coating (nano CaCO 3 The mass ratio to the total amount is 9:50, nano SiO 2 The mass ratio to the total amount is 9:50)
[0055] (1) Nano CaCO 3 / Nano SiO 2 Synthesis of dual-modified waterborne polyurethane emulsion: under the protection of nitrogen, add 173.8g of polycarbonate diol 2000, 229.5g of methylcyclohexyl diisocyanate into the reaction kettle, raise the temperature to 85°C, mix well, add 4g After reacting for 2h, the polyurethane prepolymer is obtained. Add 90g nano CaCO 3 , Stir for 2h. The temperature was lowered to 75°C, 33.6g of butyl ethyl propylene glycol was added, and the reaction was carried out for 1 h. Cool down to 60°C, then add 31.2g of dicarboxy half ester, react for 2h, add acetone to reduce the viscosity until the solution is colorless. Then add 17.8g of glycerin and react for 2h. The temperature was lowered to 25°C, and 14.1 g of tri-n-butylamine was added for neutrali...
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