Preparation method of MPOP
A melamine polyphosphate, melamine technology, applied in the direction of organic chemistry, can solve the problem of high energy consumption, achieve the effects of low reaction energy consumption, increase the degree of polymerization, reduce water solubility and water absorption
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Embodiment 1
[0023] Weigh 39.52g (0.25mol) of urea phosphate, place it in a 500mL three-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser, add 158.08g of deionized water to the three-necked flask to dissolve urea phosphate, and the concentration of urea phosphate is 20 %, then slowly add 31.54g (0.25mol) melamine to the urea phosphate solution, stir and heat up to 80°C, control the stirring speed of the electric stirrer at 200-350 rpm, keep the temperature for 1.5 hours, and after the reaction is completed, cool and filter with suction , washed with deionized water, dried in vacuum at 70°C for 24 hours, and milled to obtain 53.30 g of an intermediate with a yield of 75.00% and a pH value of 2.45 at the end of the reaction.
Embodiment 2
[0025] Weigh 39.52g (0.25mol) of urea phosphate, place it in a 500mL three-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser, add 91.21g of deionized water to the three-necked flask to dissolve urea phosphate, and the concentration of urea phosphate is 30 %, then slowly add 31.54g (0.25mol) melamine to the urea phosphate solution, stir and heat up to 80°C, control the stirring speed of the electric stirrer at 200-350 rpm, keep the temperature for 1.5 hours, and after the reaction is completed, cool and filter with suction , washed with deionized water, vacuum-dried at 70°C for 24 hours, and milled to obtain 53.45g of an intermediate with a yield of 75.22% and a pH value of 2.67 at the end of the reaction.
Embodiment 3
[0027] Weigh 39.52g (0.25mol) of urea phosphate, place it in a 500mL three-necked flask equipped with an electric stirrer, a thermometer, and a reflux condenser, add 59.28g of deionized water to the three-necked flask to dissolve urea phosphate, and the concentration of urea phosphate is 40 %, then slowly add 31.54g (0.25mol) melamine to the urea phosphate solution, stir and heat up to 80°C, control the stirring speed of the electric stirrer at 200-350 rpm, keep the temperature for 1.5 hours, and after the reaction is completed, cool and filter with suction , washed with deionized water, dried in vacuum at 70°C for 24 hours, and milled to obtain 53.76g of an intermediate with a yield of 75.05% and a pH value of 2.63 at the end of the reaction.
[0028] As can be seen from examples 1-3, with the increase of urea phosphate concentration, the pH value at the end of the reaction and the intermediate yield all show a trend of rising first and then decreasing, and all reach the maxim...
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