Application of a natural-synthetic copolymer modifier
A technology of improver and copolymer, which is applied in the field of increasing the content of stable aggregates in red mud, can solve the problems of high cost, secondary pollution, and large application amount of improver, and achieve long duration, small application amount, and improved effect Effect
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Embodiment 1
[0041] Preparation of Starch-Acrylamide Copolymer
[0042] Add 5.0 g of soluble amylose with an average molecular weight of 342 to a three-necked flask equipped with a thermometer and a nitrogen gas inlet and outlet tube, dissolve it in 100 mL of deionized water, place it in a constant temperature water bath at 40°C, blow in nitrogen gas, and stir for 15 minutes Finally, add 5.0g of acrylamide, then add 0.15g of cerium ammonium nitrate initiator, stir and react at 40°C for 6h, the obtained product is precipitated with a large amount of acetone, washed, and dried in a vacuum oven at 50°C to constant weight to obtain the final Natural-synthetic modifiers. The size of the soluble amylose aggregate is 10 μm, and the crystallinity is 20.4%.
[0043] The natural-synthetic modifier prepared in this embodiment has a grafting efficiency of 80%, and a branched chain molecular weight of 3×10 6 . The conversion rate of acrylamide monomer is over 98%, and the residual amount of monomer ...
Embodiment 2
[0045]Preparation of Starch-Acrylamide Copolymer
[0046] Add 5.0 g of soluble amylose cornstarch with an average molecular weight of 312 into a three-necked flask with a thermometer and a nitrogen gas inlet and outlet tube, dissolve it in 100 mL of deionized water, place it in a constant temperature water bath at 50 ° C, and blow in nitrogen gas, stirring After 15 minutes, add 8.0g of acrylamide, then add 0.30g of cerium ammonium nitrate initiator, stir and react at 50°C for 4h, the obtained product is precipitated with a large amount of acetone, washed, dried in a vacuum oven at 50°C to constant weight, and obtained The ultimate natural-synthetic improver. The soluble amylose corn starch has an amylose content of 87.5%, an aggregate size of 15 μm, and a crystallinity of 39.5%.
[0047] The natural-synthetic modifier prepared in this embodiment has a grafting efficiency of 98%, and a branched chain molecular weight of 6×10 6 . The conversion rate of acrylamide monomer is a...
Embodiment 3
[0049] Preparation of Starch-Acrylamide Copolymer
[0050] Add 5.0 g of soluble linear mung bean starch with an average molecular weight of 356 into a three-necked flask with a thermometer and nitrogen gas inlet and outlet tubes, dissolve it in 100 mL of deionized water, place it in a constant temperature water bath at 60 ° C, pass in nitrogen gas, and stir After 15 minutes, add 10.0g of acrylamide, then add 0.55g of cerium ammonium nitrate initiator, stir and react at 60°C for 2h, the product obtained is precipitated with a large amount of acetone, washed, dried in a vacuum oven at 50°C to constant weight, and obtained The ultimate natural-synthetic improver. The soluble amylose mung bean starch has an amylose content of 68.8%, an aggregate size of 22 μm, and a crystallinity of 29.3%.
[0051] The natural-synthetic modifier prepared in this embodiment has a grafting efficiency of 90%, and a branched chain molecular weight of 4.5×10 6 . The conversion rate of acrylamide mon...
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