A modification method of calcium sulfate whisker and its application in waterborne acrylic paint
A water-based acrylic and calcium sulfate whisker technology, which is applied in the direction of coating, etc., can solve the problems of inconvenient operation, complicated process, and restriction of chitosan application, and achieve the effects of cost saving, simple process, and improved hydration resistance
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Embodiment 1
[0028] Using carboxymethyl chitosan, STPP wet method to modify CSW, the experimental steps are as follows:
[0029] Set the temperature of the water-bath stirring pot to 80°C in advance, accurately weigh 0.5g carboxymethyl chitosan, dissolve it in a 1000ml beaker filled with 500ml of distilled water, place it in the water-bath stirring pot and stir for 30 minutes, then rotate at 300 rpm / min, now carboxymethyl chitosan dissolves completely;
[0030] Accurately weigh a predetermined mass of STPP and add it to another 1000ml beaker containing 500ml distilled water, then place the solution in a water bath at 80°C and stir for 2 minutes to dissolve it;
[0031] Accurately weigh 10.00g of calcium sulfate hemihydrate whiskers, add it into the fully dissolved carboxymethyl chitosan solution, the liquid-solid ratio is 50:1, stir for 1.0h under the experimental conditions of 80°C and 300 rpm Hot suction filtration and rinsing, the filter cake was taken out and placed in a microwave ov...
Embodiment 2
[0049] Set the temperature of the water-bath stirring pot to 80°C in advance for use, accurately weigh 0.5g of CTMAB with a predetermined mass, dissolve it in a 1000ml beaker filled with 500ml of distilled water, and place it in the water-bath stirring pot to stir for 30 minutes at a speed of 300 rpm , at this time CTMAB is completely dissolved;
[0050] Accurately weigh a predetermined mass of STPP and add it to another 500ml beaker containing 200ml distilled water, then place the solution in a water bath at 80°C, and stir for 2 minutes to dissolve it;
[0051] Accurately weigh 10.00g of calcium sulfate hemihydrate whiskers, add it to the completely dissolved CTMAB solution, the liquid-solid ratio is 50:1, stir for 1.0h under the experimental conditions of 80°C and 300 rpm, then filter while hot and rinse , the filter cake was taken out and placed in a microwave oven for 10 minutes at high temperature to obtain CTMAB modified calcium sulfate whiskers;
[0052] Dry the filter...
Embodiment 3
[0057] Accurately pipette 10ml of acetic acid into a 1000ml volumetric flask with a pipette, add distilled water to the scale line to constant volume, and prepare an acetic acid solution with a volume ratio of 1%;
[0058] Set the temperature of the water-bath stirring pot to 80°C in advance, accurately weigh 1g of chitosan CTS with a predetermined mass, dissolve it in a 500ml large beaker filled with 200ml of 1% acetic acid solution, place it in the water-bath stirring pot and stir for 30 minutes , the rotating speed is 300 rpm, and the CTS is completely dissolved at this time;
[0059] Accurately weigh a predetermined mass of STPP and add it to another 500ml beaker containing 200ml distilled water, then place the solution in a water bath at 80°C, and stir for 2 minutes to dissolve it;
[0060] Accurately weigh 20.00g of calcium sulfate hemihydrate whiskers, add to the completely dissolved CTS solution, the liquid-solid ratio is 50:1, stir for 1.0h under the experimental cond...
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