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Modified-starch composite gel, and preparation method and application thereof

A technology of modified starch and composite gel, which is applied in the direction of chemical instruments and methods, alkali metal compounds, and other chemical processes, can solve the problems of good fresh water absorption performance and poor salt water absorption performance, and achieve simple operation methods, swelling properties Effect of enhanced water absorption and good salt resistance

Active Publication Date: 2018-09-14
QINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Composite gel water-absorbing materials and related products generally have good fresh water absorption performance but poor salt water absorption performance, such as "Preparation and Performance of Organic / Inorganic Composite Super Absorbent Resin" (Han Yueyun, Cao Qiling, Huaquan County, etc., Chemical Industry Journal, 2015,66(9):3795-3800)

Method used

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  • Modified-starch composite gel, and preparation method and application thereof
  • Modified-starch composite gel, and preparation method and application thereof
  • Modified-starch composite gel, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Put a 250ml three-necked flask into an oil bath, add 2g of starch (potato starch) and 90ml of pure water, heat up to 85°C, condense and reflux with magnetic stirring for 1h, add 0.5g of zwitterionic monomer (the cationic group is Dimethylethylamine, the anion group is a carboxyl group, the molar ratio of the two groups is 1:1, the two groups are connected by methylene groups, and the number of methylene groups is 0) and 0.01g initiator ( Potassium persulfate, first dissolve with a small amount of water), keep stirring for 2 hours to obtain an aqueous solution of zwitterionic modified starch;

[0028] 2) Add 8 g of polyvinyl alcohol to the aqueous solution obtained in step 1), condense and reflux at 90°C for 4 hours, pour the obtained reactant into a mold while hot, and immediately put it into -18°C for freezing for 12 hours, to obtain a white or pale color. The brown hard solid is the hydrate of the modified starch complex gel;

[0029] 3) The hydrate obtained in st...

Embodiment 2

[0031] 1) Put a 250ml three-necked flask into an oil bath pot, add starch (bean starch) and pure water, heat up to 80°C, condense and reflux with magnetic stirring for 2h, add zwitterionic monomer (cationic group is trimethylamine) , the anion group is a sulfonic acid group, the molar ratio of the two groups is 1:1, the two groups are connected by methylene groups, and the number of methylene groups is 1) and an initiator (ceric ammonium nitrate, first used A small amount of water to dissolve), keep stirring for 2h to obtain an aqueous solution of zwitterionic modified starch;

[0032] 2) Add polyvinyl alcohol to the aqueous solution obtained in step 1), condense and reflux at 80°C for 4 hours, pour the obtained reactant into a mold while hot, and immediately put it into -20°C for freezing for 10 hours to obtain white or light brown hard The solid matter is the hydrate of the modified starch composite gel;

[0033] 3) The hydrate obtained in step 2) is placed at room temperat...

Embodiment 3

[0036] 1) Put a 250ml three-necked flask into an oil bath, add starch (consisting of grain starch and corn starch in a mass ratio of 1:1) and pure water, heat up to 90°C, and condense and reflux with magnetic stirring for 1 hour, then add zwitterions Monomer (cationic group is tetramethylammonium chloride, anionic group is phosphoric acid group, the molar ratio of the two groups is 1:1, the two groups are connected by methylene groups, and the number of methylene groups is 2) and an initiator (composed of ammonium persulfate and cerium sulfate in a mass ratio of 2:1), keep stirring for 2h to obtain an aqueous solution of zwitterionic modified starch;

[0037] 2) Add polyvinyl alcohol to the aqueous solution obtained in step 1), condense and reflux at 90°C for 2 hours, pour the obtained reactant into a mold while hot, and immediately put it into -15°C for freezing for 10 hours to obtain white or light brown hard The solid matter is the hydrate of the modified starch composite g...

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Abstract

The invention discloses modified-starch composite gel, and a preparation method and application thereof. The preparation method mainly includes 1), gelatinizing starch in water, adding zwitter-ion monomers and initiators into the obtained mixture, and stirring for 0.5-2 hours for reaction to obtain a zwitter-ion modified starch water solution, wherein the zwitter-ion monomers are compounds, the same structure unit of the zwitter-ion monomers comprises cation groups and anion groups, the molar ratio of the cation groups to the anion groups is 1:1, the cation groups are connected with the aniongroups through methylenes, and the number of methylenes is 0-3; 2), adding polyvinyl alcohol into the obtained water solution to allow reflux reaction for 2-4 hours, pouring a reactant into a mold, and performing freezing formation to obtain the modified-starch composite gel, wherein the starch, the zwitter-ion monomers, the initiators and the polyvinyl alcohol are in a ratio of 1:(0.1-1):(0.001-0.01):(2-10). The modified-starch composite gel has the advantages of high water-absorption swelling property and good heavy-metal-ion absorption capability in saline water.

Description

technical field [0001] The invention relates to a starch-based hydrogel, in particular to a modified starch composite gel and a preparation method and application thereof. Background technique [0002] Starch-based hydrogels belong to the category of polymer resins. After starch gelatinization, most of them can form translucent gels with certain elasticity and strength. The colloidal particles are cross-linked to each other to form a multi-dimensional network structure. It is used in medical and health care, agriculture and forestry greening, daily chemicals, food, construction and other fields. At the same time, starch-based hydrogels can be naturally degraded and are a class of environmentally friendly materials worthy of promotion. However, the cross-linking between starch molecules is weak, and it is difficult to meet the requirements of water-absorbing materials for mechanical strength and processing performance. Therefore, chemical cross-linking or physical cross-link...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08F251/00C08L29/04C08L51/02B01J20/26B01J20/28B01J20/30B01D15/08
CPCB01D15/08B01J20/261B01J20/28047C08F251/00C08J3/075C08J2329/04C08J2451/02
Inventor 王梓民
Owner QINZHOU UNIV
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