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Preparation method of starch based composite super absorbent resin

A super absorbent resin and composite technology, which is applied in the field of functional polymer materials, can solve the problems such as no super absorbent resin, and achieve the effects of improving the strength of water-absorbing gel, improving the salt resistance, and increasing the water absorption rate.

Inactive Publication Date: 2017-10-13
GUANGXI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the domestic published patent literature, there is no literature on the synthesis of superabsorbent resin using the oxidized cross-linked starch-kaolin composite matrix as the graft skeleton

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 100g of tapioca starch was formulated into starch milk with a mass concentration of 18% with tap water under stirring, 2.5g of sodium carbonate, 3.8g of hydrogen peroxide, and 0.03g of nickel sulfate were added, and the temperature was raised to a reaction temperature of 45°C. The reaction time was 2.5 hours, and three Sodium metaphosphate 3.2g, continue to react for 1.5 hours, add 5g of kaolin, disperse evenly, heat up to 80°C, keep for 30 minutes to fully gelatinize the starch, cool down to below 30°C, add 206g of acrylic acid, 68g of acrylamide, vinylsulfonic acid 39g of sodium, 23g of sodium propylene sulfonate, 0.18g of polyethylene glycol, 1.9g of potassium persulfate, and 1.5g of sodium thiosulfate were heated up to carry out graft copolymerization reaction at a reaction temperature of 35 to 50°C and a reaction time of 0.5 hours to obtain Grafted product: transfer the grafted product to a tray, dry it in an oven pre-heated to 85°C for 8-12 hours, grind and sieve t...

Embodiment 2

[0037] 100g of cornstarch was formulated into starch milk with a mass concentration of 20% with tap water under stirring, 1.2g of sodium hydroxide, 3.8g of potassium persulfate, and 0.05g of ferrous sulfate were added, and the temperature was raised to a reaction temperature of 43°C. The reaction time was 3 hour, add 0.3g of epichlorohydrin, continue the reaction for 3.5 hours, add 8g of kaolin, disperse evenly, raise the temperature to 85°C, keep the starch for 30 minutes to fully gelatinize, cool down to below 30°C, add 186g of acrylic acid, 78g of acrylamide, Sodium vinyl sulfonate 65g, sodium propylene sulfonate 33g, glycerol 0.13g, potassium persulfate 1.1g, sodium thiosulfate 0.6g, heat up for graft copolymerization, reaction temperature 35-60°C, reaction time 1 hours, to obtain the grafted product; transfer the grafted product to a tray, dry it in an oven heated to 85°C in advance for 8 to 12 hours, grind and sieve the dried product, and obtain the starch-based composite...

Embodiment 3

[0039] 100g of tapioca starch was prepared into starch milk with a mass concentration of 20% with tap water under stirring, and 1.8g of potassium hydroxide, 4.1g of hydrogen peroxide, and 0.07g of ferrous sulfate were added, and the temperature was raised to 48°C of reaction temperature, and the reaction time was 3 hours. Add 0.21g of phosphorus oxychloride, continue the reaction for 3.5 hours, add 3g of kaolin, disperse evenly, raise the temperature to 85°C, keep for 30 minutes to fully gelatinize the starch, cool down to below 30°C, add 388g of acrylic acid, 125g of acrylamide, vinyl Sodium sulfonate 55g, sodium propylene sulfonate 18g, glycerin 0.21g, potassium persulfate 2.5g, sodium thiosulfate 1.7g, heat up to carry out graft copolymerization reaction, reaction temperature 35~80 ℃, reaction time 0.3 hours, Obtain a grafted product; transfer the grafted product to a tray, dry it in an oven preheated to 85° C. for 8 to 12 hours, grind and sieve the dried product to obtain t...

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Abstract

The invention discloses a preparation method of starch based composite super absorbent resin. An oxidized cross-linked starch-kaolin compound matrix is adopted as the graft skeleton, acrylic acid, acrylamide, sodium vinylsulfonate and sodium allylsulfonate are taken as the graft monomer, potassium persulfate-sodium thiosulfate are adopted as the graft initiating system, glycerol and polyethylene glycol are taken as the crosslinking agent, and an aqueous solution polymerization method is employed to synthesize the salt tolerant green super absorbent resin. The starch based composite super absorbent resin has the following main technical indicators of: a deionized water absorbing rate of 500-2100g / g, a tap water absorbing rate of 200-930g / g, a 0.9% sodium chloride solution absorbing rate of 55-195g / g, a 0.9% magnesium sulfate solution absorbing rate of 15-75g / g, and a 0.9% calcium chloride solution absorbing rate of 5-29g / g.

Description

technical field [0001] The invention belongs to the technical field of functional polymer materials, and in particular relates to a preparation method of starch-based composite superabsorbent resin. Background technique [0002] Superabsorbent resin is a water-swellable functional polymer material containing strong hydrophilic groups such as carboxyl and hydroxyl groups and having a certain degree of crosslinking. It is insoluble in water and organic solvents, has unique water absorption and water retention capabilities, and has the advantages of polymer materials. Superabsorbent resin can not only absorb pure water hundreds or even thousands of times its own weight, but also has a strong water retention capacity, and it is difficult to separate water even under pressure and heat. Superabsorbent resins are widely used in the fields of physiological and sanitary products, agriculture, forestry and gardening, petrochemicals, civil engineering, food preservation, biomedicine, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F2/10C08B31/00C08B31/18C08K3/34
CPCC08B31/006C08B31/185C08F2/10C08F251/00C08K3/346C08F220/06C08F220/56
Inventor 韦爱芬朱其虎
Owner GUANGXI UNIV FOR NATITIES
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