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Preparation process of resin with starch base high water absorbency

A super absorbent resin, starch-based technology, applied in the field of preparation of starch-based super absorbent resin, can solve problems such as being unsuitable for large-scale industrial production, shortening saponification time, etc., achieving good product performance, reducing processes, and short reaction time. Effect

Inactive Publication Date: 2005-01-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Starch" 1982, volume 34, pages 95-102, mentioned that a small amount of AMPS was added to the acrylonitrile monomer, and the superabsorbent resin was synthesized according to the method in the patent (US 3935099). The addition of the second monomer shortened the saponification time, It also improves the performance of the final product, but this process still uses expensive ammonium cerium nitrate as the initiator, which is not suitable for large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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] Table 1 Effect of drying method of superabsorbent resin on water absorption performance

[0020] Drying method: drum drying, iron plate-oven drying, iron plate-blast drying

[0021] Water absorption (g / g) 1251 1267 1325

[0022] 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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Abstract

The invention is a starch-based high water absorptivity resin preparing method, using starch, acrylic nitricle (AN), and 2-acrylamide-2-methyl prophyl sulfonic acid (AMPS) as raw materials, adopting [Mn(H2P2O7)3]3- as initiator, making graft polymerization and saponification, and fast synthesizing starch-based high water absorptivity resin. It makes graft copolymerization on starch and two kinds of monomer raw materials, making them form multielement compound, the initiator is cheap and the modified process can omit medium washing step and AMPS group is added to be able to obviously shorten the synthesis process and time of the final product, reduce production cost and simultaneously also be able to improve the water-absorbing performance of the final product.

Description

technical field [0001] The present invention relates to using [Mn(H 2 P 2 o 7 ) 3 ] 3- A method for rapidly preparing starch-based superabsorbent resin by initiating graft copolymerization of starch with acrylonitrile and 2-acrylamide-2-methylpropanesulfonic acid (AMPS), which belongs to superabsorbent functional polymers [0002] technology field. Background technique [0003] Superabsorbent resin has superior performance and is widely used. It has become an indispensable material in many fields, especially in agriculture, forestry, gardening and medical hygiene. The emergence of superabsorbent resin has brought good news to women and children, and brought convenience to patients; the birth of superabsorbent resin has made the desert green a reality. Not only that, the development of superabsorbent resin will greatly enrich polymer science, especially the content of functional polymer material science, and will further promote the development of polymer synthesis theo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00
Inventor 童群义张干伟
Owner JIANGNAN UNIV
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