High-efficiency coarse whiting ground dispersant and preparation method thereof
A technology of dispersant and heavy calcium, applied in chemical instruments and methods, transportation and packaging, dissolution, etc., can solve the problems of precipitation and lower utilization efficiency of dispersant, and achieve the effect of small temperature influence and simple operation.
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Embodiment 1
[0022] The preparation of the sodium polyacrylate of embodiment 1. low molecular weight narrow distribution:
[0023] Add CuCl to the reaction kettle 2 6.02g, add 300.20g of toluene after sufficient nitrogen to expel oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 14.03g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a homogeneous complex solution. Adjust the temperature to 100° C., add 320.52 g of tert-butyl acrylate monomer and 4 g of benzophenone, irradiate with ultraviolet light for 0.5 hour, and then react with nitrogen at constant temperature for 5 hours. After passing through an alumina column to remove transition metals, the resulting solution was mixed with 70.16 g of sodium hydroxide solution (concentration: 32%) and then heated and hydrolyzed for 3 hours to convert tert-butyl polyacrylate into sodium polyacrylate. The solvent and tert-butanol by-product were distilled off....
Embodiment 2
[0024] Embodiment 2. The preparation of the sodium polymethacrylate of low molecular weight narrow distribution:
[0025] Add CuCl to the reaction kettle 2 10.91g, add 350.30g of toluene after sufficient nitrogen to drive away oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 25.20g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a homogeneous complex solution. The temperature was raised to 95° C., 355.24 g of tert-butyl methacrylate monomer and 8 g of benzophenone were added, and then reacted with constant temperature and nitrogen for 7 hours. After passing through an alumina column to remove transition metals, the resulting solution was mixed with 70.05 g of sodium hydroxide solution (concentration: 32%), then heated and hydrolyzed for 4 hours to convert poly-tert-butyl methacrylate into poly-sodium methacrylate. The solvent and tert-butanol by-product were distilled off. Add another...
Embodiment 3
[0026] Example 3. Preparation of poly(sodium acrylate-co-sodium methacrylate) with low molecular weight narrow distribution:
[0027] Add CuCl to the reaction kettle 2 8.03g, add 350.20g of toluene after sufficient nitrogen to expel oxygen, stir and mix, continue to pass nitrogen for 30 minutes, then add 18.60g of 2,2′-bipyridine, raise the temperature to 50°C under the protection of nitrogen and react for 1 hour to obtain a homogeneous complex solution. Adjust the temperature to 90° C., add 176 g of tert-butyl methacrylate, 160 g of tert-butyl acrylate monomer, and 5.37 g of benzophenone that have been driven by nitrogen to drive oxygen, and react with nitrogen at a constant temperature for 10 hours. After passing through an alumina column to remove transition metals, the resulting solution was mixed with 70.05 g of sodium hydroxide solution (concentration 32%) and then heated and hydrolyzed for 5 hours to convert the copolycarboxylate into sodium polycarboxylate. The solv...
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