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Super absorbent water-retaining agent and preparation method thereof

A water-retaining agent and high water-absorbing technology, applied in the field of water-retaining agent preparation, can solve the problem that the performance of water-retaining agent is not very obvious, and achieve the effect of flexible post-processing, low cost, and broad market prospects

Inactive Publication Date: 2011-08-31
CHINA UNIV OF MINING & TECH (BEIJING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Le Li et al. from Tianjin Urban Construction Institute used acrylic acid and acrylamide as monomers, kaolin as inorganic filler, and prepared kaolin composite starch grafted acrylamide-acrylic acid superabsorbent resin by reverse suspension method, and its maximum water absorption rate reached 647gg -1 , the salt absorption rate reaches 77gg -1 , the water retention rate is still above 50% after 5 hours at 60°C, the water retention rate of brine absorption is slightly higher than that of distilled water absorption, but its improvement on the performance of water retaining agent is not very obvious

Method used

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preparation example Construction

[0019] A preparation method of a superabsorbent and water-retaining agent according to the present invention, comprising:

[0020] Step 1: In an ice bath, neutralize 3 parts by mass of acrylic acid with sodium hydroxide, control the degree of neutralization in the range of 70% to 80%, and then add 2 parts by mass of acrylamide to form a monomer, And sequentially add potassium persulfate accounting for 0.1-0.3% of the total mass of the monomers, N-N' methylenebisacrylamide accounting for 0.02-0.03% of the total mass of the monomers, each accounting for 3-7% of the total mass of the monomers polyethylene glycol-2000 and polyethylene glycol-6000, and bentonite or calcined kaolin accounting for 5-15% of the total mass of monomers to form a water phase mixed solution.

[0021] In step 2, cyclohexane and glyceryl monostearate are added to the reaction flask, and the volume ratio of the oil phase to the water phase in step 1 is kept at 1.5:1 to 3:1, and the amount of glyceryl monoste...

Embodiment 1

[0026] 1) In an ice bath, neutralize 18 g of acrylic acid with sodium hydroxide, and control the degree of neutralization to 80%, to form a mixed solution of acrylic acid and sodium acrylate. Afterwards, 12 g of acrylamide, 0.09 g of initiator potassium persulfate, 0.006 g of crosslinking agent N-N' methylenebisacrylamide, 1 g of anti-sticking agent polyethylene glycol-2000 and polyethylene glycol were successively added to the solution. Ethylene glycol-6000. Finally, after the solution was clarified, 3 g of bentonite was added to form a mixed aqueous solution.

[0027] 2) Mix 150 mL of cyclohexane and 3 g of glycerol monostearate according to the volume ratio of the oil phase to the water phase at 3:1, and heat and pre-stir in a constant temperature water bath at 65° C. to form an oil phase.

[0028] 3) Add the water phase mixture in step 1) dropwise to the oil phase in step 2), and slowly raise the temperature to 70°C and stir for 1 hour, then slowly raise the temperature t...

Embodiment 2

[0032] 1) In an ice bath, neutralize 24g of acrylic acid with sodium hydroxide, and control the degree of neutralization to 70%, to form a mixed solution of acrylic acid and sodium acrylate. After that, add 16g acrylamide, 0.06g initiator potassium persulfate, 0.009g cross-linking agent N-N' methylenebisacrylamide, each 1.5g anti-sticking agent polyethylene glycol-2000 and Polyethylene glycol-6000. Finally, after the solution was clarified, 4.5 g of calcined kaolin was added to form a mixed aqueous solution.

[0033] 2) Mix 125 mL of cyclohexane and 2 g of glyceryl monostearate according to the volume ratio of the oil phase to the water phase of 2.5:1, and heat and pre-stir in a constant temperature water bath at 60° C. to form an oil phase.

[0034] 3) Add the water phase mixture in step 1) dropwise to the oil phase in step 2), and slowly raise the temperature to 70°C and stir for 1 hour, then slowly raise the temperature to 72°C and continue the reaction for 1.5 hours to fu...

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Abstract

The invention discloses a super absorbent water-retaining agent and a preparation method thereof. Acrylic acid and acrylamide are used as monomers, potassium persulfate is used as an initiator, N-N' methylene-bisacrylamide is used as a crosslinking agent, polyethylene glycol-2000 and polyethylene glycol-6000 are used as anti-adhesive agents, and bentonite or calcined kaoline is used as an inorganic filler, so that a water phase is formed; and cyclohexane is used as a solvent, glyceryl monostearate is used as a dispersant, and oil phase is mixed with the water phase, so that the super absorbent water-retaining agent is prepared by using an inverted suspension polymerization method. The water absorbency of the prepared poly(acrylic acid / acrylamide / clay) water-retaining agent reaches between1,250 gg<-1> and 1,350 gg<-1>, salt absorbency (0.9 weight percent of NaCl) reaches between 100 gg<-1> and 120 gg<-1>, and water retention rate of a sample can still reach over 50 percent after 13 hours at the temperature of below 70 DEG C; and the super absorbent water-retaining agent can be widely applied to the fields of construction of various water conservancy works, medical treatment and environmental protection.

Description

technical field [0001] The invention relates to a method for preparing a poly(acrylic acid / acrylamide / clay) water-retaining agent by a reverse-phase suspension polymerization method and the water-retaining agent thereof, belonging to the technical field of water-retaining agent preparation. Background technique [0002] Water-retaining agent is a high-molecular polymer with high water-absorbing and water-retaining properties. It has been widely used in agriculture, forestry, soil water conservation and moisturizing, industry, medical treatment and other fields. At present, the more commonly used is acrylic water retaining agent. [0003] With the advancement of science and technology and the discovery of research, adding inorganic clay to the three-dimensional network structure of the water-retaining agent can not only improve its comprehensive performance, such as water absorption performance, salt resistance, mechanical strength, thermal stability, etc., but also effective...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/56C08F2/44C08F2/32C08K3/34
Inventor 朱红青索红莉刘敏张腾王毅马麟吴紫萍郭艾东赵锋刘德峰
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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