Method for preparing inverse suspension polymerization polymethacrylic acid moisture-absorption resin

A technology of polymethacrylic acid, methacrylic acid, applied in the field of hygroscopic materials

Inactive Publication Date: 2008-07-23
CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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  • Abstract
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Problems solved by technology

The reverse phase suspension polymerization method of polyacrylic acid superabsorbent resin has been reported in the above-mentioned...

Method used

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  • Method for preparing inverse suspension polymerization polymethacrylic acid moisture-absorption resin

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Experimental program
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Embodiment 1

[0018] Add 120 g of cyclohexane into the three-necked flask, add 1.3 g of dispersant stearyl phosphoester, and stir at room temperature. 42 grams of methacrylic acid was placed in a beaker, and neutralized with 39.02 grams of 30% sodium hydroxide aqueous solution at -3°C. Dissolve 0.17 g of potassium persulfate and 0.04 g of N,N'-methylenebisacrylamide in 10 g of water; fully dissolve 0.6 g of ethyl hydroxyethyl cellulose in 40 g of water, add initiator and crosslinking agent In the aqueous solution, after mixing evenly, add it into the neutralized methacrylic acid solution to obtain a monomer mixed solution. Raise the temperature of the three-neck flask to 55°C, add the monomer mixture dropwise, finish dropping in 45 minutes, and react at 55°C for 6 hours. After the reaction, cool down to room temperature, filter, wash with methanol, and dry at 110°C to obtain granular polymer Methacrylic hygroscopic resin. The obtained high hygroscopic resin has a moisture absorption rate ...

Embodiment 2

[0020] Add 120 g of cyclohexane into the three-necked flask, add 0.48 g of dispersant stearyl phosphoester, and stir at room temperature. 48 grams of methacrylic acid was placed in a beaker, and neutralized with 48.3 grams of 30% sodium hydroxide aqueous solution at 10°C. Dissolve 0.19 grams of potassium persulfate and 0.04 grams of N, N'-methylenebisacrylamide in 10 grams of water; fully dissolve 1.4 grams of ethyl hydroxyethyl cellulose in 90 grams of water, add initiator and crosslinking agent In the aqueous solution, after mixing evenly, add it into the neutralized methacrylic acid solution to obtain a monomer mixed solution. Raise the temperature of the three-neck flask to 55°C, add the monomer mixture dropwise, and raise the temperature to 65°C after 40 minutes of dripping, and react for 4 hours. After the reaction is completed, lower the temperature to room temperature, filter, wash with methanol, and dry at 100°C to obtain granular Polymethacrylic hygroscopic resin. ...

Embodiment 3

[0022] Add 120 grams of cyclohexane into the three-necked flask, add 2.25 grams of dispersant stearyl phosphoester, and stir at room temperature. 45 grams of methacrylic acid was placed in a beaker, and neutralized with 48.78 grams of 30% sodium hydroxide aqueous solution at -1°C. Dissolve 0.135 grams of potassium persulfate and 0.03 grams of N,N'-methylenebisacrylamide in 10.065 grams of water; fully dissolve 0.9 grams of ethyl hydroxyethyl cellulose in 81 grams of water, add initiator and crosslinking agent In the aqueous solution, after mixing evenly, add it into the neutralized methacrylic acid solution to obtain a monomer mixed solution. Raise the temperature of the three-neck flask to 55°C, add the monomer mixture dropwise, and then raise the temperature to 75°C after 45 minutes, and react for 5 hours. After the reaction, cool down to room temperature, filter, wash with methanol, and dry at 115°C to obtain granular Polymethacrylic hygroscopic resin. The obtained high h...

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Abstract

The invention discloses an inverse suspension polymerization preparation method for polymethacrylic acid highly absorbent resin, which belongs to the hygroscopic material field; the preparation method is characterized of using cyclohexane as solvent, using methacrylic acid as monomer, using potassium persulfate as initiator, using N, N'- methylene diacrylamide as cross-bonding agent, using octadecanol phosphatide as dispersing agent, and using ethylhydroxyethylcellulose as thickening agent. The polymethacrylic acid highly absorbent resin is prepared by the inverse suspension polymerization method, with a moisture absorption rate greater than or equal to 7g/g.min, under the conditions of air temperature being at 30 DEG C and relative humidity at 90%.

Description

technical field [0001] The invention belongs to the field of moisture-absorbing materials, and in particular relates to a preparation method of reverse-phase suspension polymerization polymethacrylic acid moisture-absorbing resin. Background technique [0002] Highly hygroscopic polymers are divided into three categories according to the source of raw materials: starch system, cellulose system and synthetic resin system. Among them, synthetic resin is a functional polymer material containing strong hydrophilic groups and a certain degree of crosslinking. Its water absorption performance and moisture absorption performance are relatively good, and it has developed rapidly at home and abroad (Zou Xinxi, super absorbent agent , Beijing, Chemical Industry Press, 1991), especially the United States and Japan are the fastest growing, and many acrylic acid series products have been industrialized. [0003] The reverse phase suspension polymerization method is one of the main metho...

Claims

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Application Information

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IPC IPC(8): C08F120/14C08F2/32
Inventor 白福臣温诗渺于力张志成潘振远张春晓
Owner CHANGZHOU INST OF ENERGY STORAGE MATERIALS &DEVICES
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