Preparation method of MF (melamine-formaldehyde) resin-coated Mg/Al-LDHs (magnesium/aluminum-layered double hydroxide) microcapsule
A layered bimetal and melamine technology, applied in the chemical industry, can solve problems such as poor dispersibility and compatibility, and achieve the effects of low cost, poor dispersibility and compatibility, and simple preparation process
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Embodiment 1
[0020] 80 g of 37% formaldehyde solution, 41.5 g of melamine and 200 g of deionized water were respectively added into the three-necked flask and stirred evenly. Raise the temperature to 70°C, adjust the pH value of the reaction system to 8.5 with 10% triethanolamine solution, stir and react in a 70°C water bath for 60 minutes, take out the solution after it is clear and transparent and reaches the required viscosity, and obtain the MF prepolymer;
[0021] Add 2 g of sodium dodecylbenzenesulfonate emulsifier into 100 ml of deionized water, heat at 85° C. for 1 hour to dissolve, and prepare a 1% emulsifier solution. Take a 500ml three-neck flask, add the prepared emulsifier solution to it, and then add 100ml deionized water and 6g Mg / Al-LDHs. Raise the temperature of the system to 35°C, and stir the mixing system with a multifunctional disperser at a speed of 4000r / min for 60 minutes. After fully stirring and mixing uniformly, the Mg / Al-LDHs emulsion is obtained;
[0022] 3g o...
Embodiment 2
[0024] 80 g of 37% formaldehyde solution, 41.5 g of melamine and 200 g of deionized water were respectively added into the three-necked flask and stirred evenly. Raise to 70°C, use 10% triethanolamine solution to adjust the pH value of the reaction system to 8.5, stir and react in a 70°C water bath for 60 minutes, and take out the solution after it is clear and transparent and reaches the required viscosity to obtain MF prepolymer;
[0025] Add 2 g of sodium dodecylbenzenesulfonate emulsifier into 100 ml of deionized water, heat at 85° C. for 1 hour to dissolve, and prepare a 1% emulsifier solution. Take a 500ml three-neck flask, add the prepared emulsifier solution to it, and then add 100ml deionized water and 6g Mg / Al-LDHs. Raise the temperature of the system to 35°C, and stir the mixing system with a multifunctional disperser at a speed of 4000r / min for 60 minutes. After fully stirring and mixing uniformly, the Mg / Al-LDHs emulsion is obtained;
[0026] 6g of MF prepolymer ...
Embodiment 3
[0028] 80 g of 37% formaldehyde solution, 41.5 g of melamine and 200 g of deionized water were respectively added into the three-necked flask and stirred evenly. Then rise to 70°C, adjust the pH value of the reaction system to 8.5 with 10% triethanolamine solution, stir and react in a 70°C water bath for 60 minutes, take out the solution after it is clear and transparent and reaches the required viscosity, and obtain the MF prepolymer;
[0029] Add 2g of sodium dodecylbenzenesulfonate emulsifier into 100ml of deionized water, heat at 85°C for 1 hour to dissolve, and prepare a 1wt.% emulsifier solution. Take a 500ml three-neck flask, add the prepared emulsifier solution to it, and then add 100ml deionized water and 6gMg / Al-LDHs. Raise the temperature of the system to 35°C, and stir the mixing system with a multifunctional disperser at a speed of 4000r / min for 60 minutes. After fully stirring and mixing uniformly, the Mg / Al-LDHs emulsion is obtained;
[0030] 12g of MF prepolymer...
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