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Preparation method of compound-type starch modification super absorbent resin

A superabsorbent resin and starch modification technology, which is applied in the field of water-retaining agent preparation, can solve the problems of high preparation cost, soil salt tolerance and low water retention rate

Inactive Publication Date: 2013-07-31
NANJING FORESTRY UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0006] The invention provides a preparation method of a composite starch-modified superabsorbent resin, aiming at solving the problems of the degradability of the existing water-retaining agent, the low salt tolerance and water retention rate in the soil, and the high preparation cost

Method used

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  • Preparation method of compound-type starch modification super absorbent resin
  • Preparation method of compound-type starch modification super absorbent resin
  • Preparation method of compound-type starch modification super absorbent resin

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preparation example Construction

[0028] The preparation method comprises the following steps:

[0029] In step S101, add an appropriate amount of deionized water to the cornstarch and stir, slowly raise the temperature to 70°C, and after the starch is completely gelatinized, lower the gelatinized solution to room temperature for later use;

[0030] In step S102, under the condition of cooling with ice water, weigh an appropriate amount of acrylic acid solution, neutralize it with 25% sodium hydroxide solution, and add 15% sodium bicarbonate solution as a pH buffer to obtain a monomer solution;

[0031] In step S103, under the protection of nitrogen, the monomer solution and the gelatinized liquid are stirred and mixed, then ammonium persulfate is added, and the temperature is slowly heated to 58-62°C;

[0032] In step S104, add a saturated solution of sodium alginate, drop a cross-linking agent, and react for 2-2.5 hours;

[0033] In step S105, after the reaction is completed, the nitrogen flow is stopped, a...

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Abstract

The invention discloses a preparation method of a compound-type starch modification super absorbent resin. The preparation method comprises the following steps of: adding deionized water to corn starch, stirring, slowly heating to 70 DEG C, and after completely dextrinizing the starch, reducing pasting liquid to a room temperature for standby application; weighting a right amount of acrylic acid solution under the action of ice water cooling, neutralizing by a 25% sodium hydroxide solution, adding 15% sodium bicarbonate as a pH buffering agent, and obtaining a monomer solution; after uniformly mixing the monomer solution and the pasting liquid in the presence of nitrogen, adding ammonium persulfate, and slowly heating to 58 DEG C to 62 DEG C; adding a sodium alginate saturated solution, dropwise adding a cross-linking agent, and reacting for 2-2.5 hours; after reaction is ended, stopping the feeding of nitrogen, drying copolymers to constant weight at 75-80 DEG C, smashing, screening by a 60-80 screen and obtaining the compound-type starch modification super absorbent resin. The environment-friendly water-absorbent resin with high salt tolerance and high water retention rate is prepared by starch graft copolymerization and alginate crosslinking.

Description

technical field [0001] The invention belongs to the technical field of water-retaining agent preparation, and in particular relates to a preparation method of a composite starch-modified superabsorbent resin. Background technique [0002] Water-retaining agent is a kind of high molecular polymer insoluble in water. It grafts, copolymerizes and cross-links water-soluble polymers under certain conditions to form a water-insoluble but highly swellable polymer. The inside of the water retaining agent forms a three-dimensional space network structure, and its molecules contain a large number of carboxyl (-COO-), hydroxyl (-OH) and other strong hydrophilic functional groups. [0003] The solution polymerization method is currently widely used in the production of water-retaining agents. The raw materials mainly include reactive monomers, initiators, crosslinking agents and solvents. It is synthesized under the action of Etc., which has the advantages of high initiation efficiency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08F251/00C08L51/02C08L5/04
Inventor 朱丽珺孙瑞健张金池李梦瑶刘杨
Owner NANJING FORESTRY UNIV
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