Preparation process of resin with starch base high water absorbency
A superabsorbent resin and starch-based technology, applied in the field of preparation of starch-based superabsorbent resin, can solve the problems of shortening the saponification time and not being suitable for large-scale industrial production, so as to reduce the process, improve product performance and reduce production costs Effect
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Embodiment 1
[0014] Put 4g of absolute dry starch into a four-necked flask, add 80ml of deionized water, put it into a water bath at 85.9°C for 30min, cool it at room temperature, and feed it with N 2 . When cooling to 30°C, add 5.68g acrylonitrile, 14.6ml concentration is 1.094×10 -2 The initiator of mol / L (make the initiator concentration in the reaction system be 2.0 * 10 -3 mol / L) and 1.26g AMPS, acrylonitrile and initiator solution should be added first, and AMPS should be added after 1min. The grafting reaction was carried out for 1.5h, and then a certain amount of water and KOH were added to make the total volume of the system 203.7ml, and the concentration of KOH was 0.507mol / L. Keep the temperature of the system at 92.6°C and stir at the same time to saponify the graft copolymer. After the color of the mixture changes from deep red to light yellow, cool the mixture, first wash it with sulfuric acid or hydrochloric acid, and then wash it with ethanol. Put between two iron plates...
Embodiment 2
[0016] When the KOH in Example 1 is replaced by NaOH, the water absorption rate of the superabsorbent resin finally obtained is 1233g / g, the absorption rate of 0.9% NaCl is 60.8g / g, and the absorption rate of 0.2% CaCl is 60.8g / g. 2 The rate was 50.9 g / g.
Embodiment 3
[0018] When the iron plate-vacuum drying method in Example 1 is replaced by other drying methods, the results are shown in the table below
[0019] drying method
[0020] It can be seen from the table that when the drum drying method is used or the iron plate is dried in a general oven, the water absorption capacity of the superabsorbent resin is low, while the water absorption capacity of the product is lower when the blast drying oven or vacuum drying oven is used. higher. However, considering actual production, the drum drying method is suitable for large-scale production.
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