Weather resistant water-retaining agent and its prepn

A water-retaining agent and weather resistance technology, applied in the field of super absorbent resin and its preparation, can solve the problems of disintegration of the cross-linked structure of the water-retaining agent, loss of water retention, long reaction time, etc., and achieve flexible production operation arrangements, short reaction time, The effect of low production cost

Inactive Publication Date: 2006-05-17
珠海得米新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after this type of water retaining agent is saturated with water, the cross-linking agent N,N'-methylenebisacrylamide is easily hydrolyzed under the action of ultraviolet rays, resulting in the disintegration of the cross-linked structure of the water retaining agent
In this way, when this type of water-retaining agent is used outdoors, it will quickly gelatinize, become sticky, and turn into an aqueous solution due to the disintegration of the cross-linked structure under sunlight, and finally lose its water-retaining property.
Moreover, according to the current production technology, the polymerization reaction time of this type of water retaining agent is very long or the reaction material needs to be heated to a higher reaction temperature, such as JP-Zhao 60-161409, USP4525527 adopts one-step method of feeding, and the reaction time is as long as 4 hours ; And in CN1375509A, the reaction material needs to be heated above 60~100℃

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Add 6 kg of water and 2 kg of acrylic acid to the batching kettle, stir evenly, neutralize with 3 kg of 30% sodium hydroxide aqueous solution, add 5 kg of acrylamide and 8 g of N, N'-methylenebisacrylamide, Stir to dissolve to obtain a reaction mixture. 7 grams of potassium persulfate and 7 grams of sodium bisulfite were respectively configured as 9% aqueous solution, successively added to the reaction mixture and stirred evenly, then poured into the reaction tray, the thickness of the reaction mixture in the reaction tray was 3.4 cm, and the reaction After 10 minutes, a water-retaining agent gel was obtained. After gel crushing, drying, crushing and other steps, the water retaining agent product is obtained. The ability of the water retaining agent to absorb deionized water is 220 times, and the ability to absorb normal saline is 35 times. The water retaining agent gel that absorbs deionized water to reach saturation is placed in a transparent container and exposed to...

Embodiment 2

[0011] Add 20 kg of water to the batching kettle, add 7 kg of acrylic acid, stir evenly, neutralize with 8 kg of 32% potassium hydroxide aqueous solution, add 16 kg of acrylamide, 23 g of N, N'-methylenebisacrylamide, Stir and dissolve to obtain a reaction mixture; pour the reaction mixture into a reaction tray with a thickness of 5.7 cm, then add 38 grams of potassium persulfate and 35 grams of sodium bisulfite, stir evenly, and polymerize to obtain a water-retaining agent gel . After gel crushing, drying, crushing and other steps, the water retaining agent product is obtained. The ability of the water-retaining agent to absorb deionized water is 233 times, and the ability to absorb normal saline is 37 times. The water-retaining agent gel that absorbs deionized water to reach saturation is placed in a transparent container and exposed to sunlight with an ultraviolet index exceeding 9 for 3 Day without gelatinization, not sticky.

Embodiment 3

[0013] Add 2 kg of water to the batching kettle, add 700 g of acrylic acid, stir evenly, neutralize with 1 kg of 31% sodium hydroxide aqueous solution, add 1.8 kg of acrylamide and 4 g of N, N'-methylenebisacrylamide and stirred to dissolve to obtain a reaction mixture. Pour the reaction mixture into the reaction tray with a thickness of 7 cm, and then respectively add 12% aqueous solution containing 5 grams of potassium persulfate and 5.5 grams of sodium bisulfite to the reaction mixture and stir evenly, react to obtain water retention gel. Dried and pulverized to obtain a water-retaining agent product. The ability of the water-retaining agent to absorb deionized water is 187 times, and the ability to absorb normal saline is 33 times. The water-retaining agent gel that absorbs deionized water to reach saturation is placed in a transparent container and exposed to sunlight with an ultraviolet index exceeding 9 for 3 Day without gelatinization, not sticky.

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Abstract

The present invention is weather resistant water-retaining agent and its preparation. The weather resistant water-retaining agent has relatively high ultraviolet ray resistance and may be used widely in agriculture, forest, garden and other outdoor fields. The present invention features the neutralizing process with polymerization of acrylic acid; dissolving great amount of acrylamide into the neutralizing liquid to lower the temperature; composite reaction initializing system for reaction at different temperature conditions; greatly increased N, Ní»-methylene diacrylamide and acrylamide amount for raised weather resistance and lower production cost of the water-retaining agent; controlled reaction strength for high water absorbing capacity of the water-retaining agent, and disc polymerization with no need of nitrogen protection and short reaction time.

Description

technical field [0001] The invention belongs to the technical field of superabsorbent resin and its preparation method, and in particular relates to a weather-resistant water-retaining agent and its preparation method. Background technique [0002] At present, the most widely used water-retaining agent with the most advanced production technology is a copolymer water-retaining agent prepared from acrylic acid and acrylamide. . However, after this type of water retaining agent is saturated with water, the crosslinking agent N, N'-methylenebisacrylamide is easily hydrolyzed under the action of ultraviolet rays, resulting in the disintegration of the crosslinked structure of the water retaining agent. In this way, when this type of water-retaining agent is used outdoors, it will quickly become gelatinized, sticky, and turn into an aqueous solution due to the disintegration of the cross-linked structure under sunlight, and eventually lose its water-retaining property. Moreover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/04C08F4/40C08F220/56
Inventor 尹国强姚育忠崔英德黎新明吴洁鹏廖列文贾振宇邓志城康正
Owner 珠海得米新材料有限公司
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