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Water keeping gel and its method for producing

A technology of water-retaining gel and gel, which is applied in the field of superabsorbent resin, can solve the problems of poor and small water-retaining capacity, can only absorb several times or even dozens of times of its own mass, and dehydration, etc., to achieve production costs Low cost, easy to operate, and convenient for industrial production

Inactive Publication Date: 2003-09-17
珠海国佳凝胶研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional water-absorbent materials such as absorbent cotton, sponge, silica gel, etc. have low water absorption capacity and can only absorb water several times or even dozens of times their own mass; especially poor water retention capacity, they lose water when slightly pressurized

Method used

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  • Water keeping gel and its method for producing
  • Water keeping gel and its method for producing

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Embodiment

[0009] The process flow provided by the invention is shown in the accompanying drawings: first dissolve sodium hydroxide in a certain amount of water, then add a certain amount of acrylic acid for pretreatment. Then add cornstarch, acrylamide and calcium carbonate in sequence, stir evenly, and maintain the temperature of the reaction solution at about 50--52°C. Finally, an initiator (such as ammonium persulfate, etc.) is added to carry out graft polymerization, and the holding time is 1.8--3 hours. After the graft polymerization reaction is completed, the reaction liquid can be poured into a special mold, put into a constant temperature dryer at 100°C for drying, and the water-retaining gel product can be obtained.

[0010] The gel prepared according to the above method, its components and weight percentages are shown in the attached table, namely: corn starch 4.5-4.7, acrylic acid 21.4-22.5, acrylamide 9-9.5, ammonium persulfate 3.2-4.5 , calcium carbonate 4.5--4.7, sodium h...

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Abstract

The invention is a water-retaining gel and a preparation method thereof. The preparation method of the water-retaining gel is: first dissolve sodium hydroxide in water, and add acrylic acid for pretreatment; then add cornstarch, acrylamide and calcium carbonate in turn, stir and heat for reaction, and then add an initiator to carry out graft polymerization reaction ; Then pour the reacted liquid into the mold and dry at a constant temperature. The water-retaining gel includes the following components (percentage by weight): cornstarch 4.5--4.7, acrylic acid 21.4--22.5, acrylamide 9--9.5, ammonium persulfate 3.2--4.5, calcium carbonate 4.5--4.7, sodium hydroxide 9.5--9.9, water balance. The invention has the advantages of simple process, non-toxic product, biodegradability, wide application and the like.

Description

technical field [0001] The invention relates to the field of superabsorbent resins, in particular to a water-retaining gel and a preparation method thereof. Background technique [0002] Superabsorbent resin is a new type of high-tech functional polymer material developed rapidly in recent years. It is mainly made of modified natural polymers or modified synthetic polymers, and the shape is granular or powdery. [0003] Superabsorbent resins are different from conventional absorbent materials. Traditional water-absorbent materials such as absorbent cotton, sponge, silica gel, etc. have low water absorption capacity and can only absorb water several times or even dozens of times their own mass; especially poor water retention capacity, they lose water when slightly pressurized. The superabsorbent resin can absorb hundreds or even thousands of times its own mass of water, not only has excellent water absorption performance, but also has excellent water retention capacity; eve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L3/02
Inventor 王海波
Owner 珠海国佳凝胶研究院有限公司
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