| CPC C08J 3/075 (2013.01) [C08J 3/24 (2013.01); C08K 5/1515 (2013.01); C08J 2305/00 (2013.01)] | 8 Claims |
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1. A preparation method for polysaccharide spherical gel resin, the preparation method comprising the following steps:
(1) adding a polysaccharide, a solvent, and an auxiliary agent into a batching kettle, performing heating to 85-95° C., and performing stirring until a clarified solution is obtained so as to obtain a polysaccharide mixed solution; the solvent is pure water or an aqueous solution; the aqueous solution is a mixture of water and an organic solvent;
(2) conveying the polysaccharide mixed solution in step (1) to a drip tray, and subjecting the drip tray to heat at 60-90° C.;
(3) forming the polysaccharide mixed solution into spherical liquid drops by using a liquid drop forming device on the drip tray, and adding the spherical liquid drops into a forming tower for spherical gelling in the forming tower; and preparing polysaccharide spherical gels with different particle sizes by adjusting a volume of the liquid drops, wherein the particle sizes are 4-15 mm; an oily medium is included in the forming tower to maintain spherical shape of the liquid drops, and the forming tower is sequentially divided into a forming buffer area, a forming area and a curing area from top to bottom; the forming buffer area is controlled at a temperature of 40-50° C.; the forming area is controlled at a temperature of 10-40° C.; and the curing area is controlled at a temperature of 0-10° C.;
(4) subjecting the polysaccharide spherical gels formed in step (3) to oil-sphere separation at a discharge port at a bottom of the forming tower by performing primary cleaning:
subjecting the polysaccharide spherical gels to cleaning with micro-nano bubbles to obtain cleaned polysaccharide spherical gels and to recover the oily medium;
(5) performing screening on the cleaned polysaccharide spherical gels according to size requirements to obtain qualified polysaccharide spherical gels with target sizes;
(6) performing crosslinking: adding a crosslinking agent to the qualified polysaccharide spherical gels screened in step (5), performing stirring for 1-4 hours, then adding an alkaline solution, and performing stirring at 20-50° C. for 1-24 hours; and
(7) performing secondary cleaning: cleaning the crosslinked polysaccharide spherical gels completely crosslinked in step (6) to reach a pH value of less than 8 so as to obtain the polysaccharide spherical gel resin.
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