A dry soil water-retaining agent based on modified red mud and its preparation method and application
A technology of water-retaining agent and red mud, which is applied in application, land preparation methods, superphosphate, etc., can solve the problems of red mud treatment difficulties, poor water retention measures in desertified land, etc., achieve excellent water retention capacity, and solve land waste and environmental pollution , to achieve the effect of making full use of
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Embodiment 1
[0035]Example 1, Synthesis of partially crosslinked polyacrylic acid --- bisamide crosslinking
[0036] Prepare the acrylic acid solution in a 500mL four-necked bottle equipped with a thermometer, an electric stirrer, and a dropping funnel. Add 40g of acrylic acid, add 160g of tap water, add 0.03g of N,N-methylenebisacrylamide, 1.6g of ammonium persulfate, stir to dissolve, take a quarter, add to the reaction bottle, and add the rest to the dropping funnel. Stir and heat to 75-85°C, and the polymerization starts to have a violent exotherm. Start to add the acrylic acid solution dropwise, and after the drop is completed, stir and react at 90-97°C for 2h to obtain a viscous partially crosslinked polyacrylic acid aqueous solution (called BJPA-1) with a viscosity of 8000Pa·s.
Embodiment 2
[0037] Example 2. Synthesis of partially cross-linked polyacrylic acid --- cross-linking in copolymerization and post-esterification cross-linking
[0038] Prepare the acrylic acid solution in a 500mL four-necked bottle equipped with a thermometer, an electric stirrer, and a dropping funnel. Add 40g of acrylic acid, add 160g of tap water, add 0.03g of N,N-methylenebisacrylamide, 1.6g of ammonium persulfate, stir to dissolve, take a quarter, add to the reaction bottle, and add the rest to the dropping funnel. Stir and heat to 75-85°C, and the polymerization starts to have a violent exotherm. Start to add the acrylic acid solution dropwise, after dropping, stir and react at 90-97°C for 2h to obtain a viscous partially cross-linked polyacrylic acid aqueous solution, then add 16g of polyvinyl alcohol aqueous solution with a mass concentration of 10% (the degree of hydrolysis is greater than 98%), and The reaction was stirred at low temperature for 2 hours to obtain a viscous part...
Embodiment 3
[0039] Embodiment 3, polyacrylic acid synthesis
[0040] Prepare the acrylic acid solution in a 500mL four-necked bottle equipped with a thermometer, an electric stirrer, and a dropping funnel. 40g of acrylic acid, add 160g of tap water, 1.6g of ammonium persulfate, stir to dissolve, take a quarter, add to the reaction bottle, and add the rest to the dropping funnel. Stir and heat to 75-85°C, and the polymerization starts to have a violent exotherm. Start to add the acrylic acid solution dropwise, and after the drop is completed, stir and react at 90-97°C for 2 hours to obtain a polyacrylic acid aqueous solution (called PA) with a viscosity-average molecular weight of 210,000.
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