Method for preparing poly(acrylic acid-acrylic amide)/hydrotalcite high water absorption resin

A technology of superabsorbent resin and acrylamide is applied in the field of preparation of poly/hydrotalcite nanocomposite superabsorbent resin by using hydrotalcite. The effect of salt properties

Inactive Publication Date: 2009-03-25
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AI-Extracted Technical Summary

Problems solved by technology

However, the comprehensive properties of polyacrylic resins are not satisfactory, such as salt resistan...
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The invention discloses a preparation method of a poly-(acrylic acid-acrylamide)/ hydrotalcite super water absorbent resin, wherein, the method utilizes hydrotalcite with organic modification as an inorganic filler, cyclohexane as a solvent, the crylic acid and the acrylamide as monomers; by adopting the principle of in-situ polymerization, the hydrotalcite is peeled off from a polymer matrix to prepare a nano composite super water absorbent salt-resistant resin. The super water absorbent salt-resistant resin obtained by the preparation method has the maximum water absorption rate of 1100g/g, the maximum salt-resistant rate of 145g/g, the artificial-blood absorption rate reaching 72.8g/g and the artificial-urine absorption rate reaching 80.7g/g.

Technology Topic

SolventAbsorption rate +10


  • Method for preparing poly(acrylic acid-acrylic amide)/hydrotalcite high water absorption resin
  • Method for preparing poly(acrylic acid-acrylic amide)/hydrotalcite high water absorption resin


  • Experimental program(5)
  • Effect test(1)

Example Embodiment

[0014] Example 1
[0015] First, add hydrotalcite and modifier into N,N'-dimethylacetamide, stir vigorously at 70-80°C for 22-24 hours, filter with suction, wash and dry to obtain organically modified hydrotalcite , the modifier can be sodium methacrylate, sodium propene sulfonate or sodium dodecylsulfonate.
[0016] Add 150 g of cyclohexane and 0.99 g of dispersant Span-60 into a four-port glass jacketed reactor, and stir at room temperature. 22.5 grams of acrylic acid was placed in a beaker, and neutralized with 23.4 grams of 40% sodium hydroxide aqueous solution at 0°C. Add 2.25 g of acrylamide and 0.25 g of organically modified hydrotalcite (1 wt%) into the neutralized acrylic acid aqueous solution and stir evenly to prepare an emulsion. Finally, 0.045 grams of potassium persulfate and 0.0045 grams of N, N'-methylenebisacrylamide were added to the above-mentioned emulsion, stirred evenly, and placed in a reaction kettle. Under the protection of nitrogen, first react at 50°C for 1h, then react at 60°C for 2h, and finally azeotropically dehydrate as completely as possible at 75°C. After the reaction, filter with suction and wash with a mixed solution of water and methanol (1:9V/V) for 3 to 5 times, and dry in vacuum at 70°C for 24 hours to obtain granular poly(acrylic acid-acrylamide)/hydrotalcite nano-superabsorbent Sexual resin.
[0017] Determination of water (salt) rate: use the tea bag method to measure its water (salt) rate, weigh 0.5g of resin and place it in a 100-mesh nylon bag, and put it into 500ml of deionized water and 200ml of 0.9% NaCl solution In the beaker, after the resin fully absorbs water and swells, take out the suspension and weigh its gel quality, and then calculate the saturated water absorption (salt) rate Q (g/g) according to the formula:
[0018] Q=(m 2 -m 1 )/m 1
[0019] where m 1 、m 2 Respectively, the mass (g) of the resin before and after water (salt) absorption.
[0020] Its water absorption rate is ≥678.3g/g, and its salt tolerance rate is ≥97.3g/g.

Example Embodiment

[0021] Example 2
[0022] Same as Example 1, except that 0.5 gram of organically modified hydrotalcite (2wt%) was added to obtain the water absorption of granular poly(acrylic acid-acrylamide)/hydrotalcite nano superabsorbent resin ≥ 736.7g/g, Salt tolerance ≥121.3g/g.

Example Embodiment

[0023] Example 3
[0024] Same as Embodiment 1, the difference is that 0.74 gram of organically modified hydrotalcite (3wt%) is added to obtain granular poly(acrylic acid-acrylamide)/hydrotalcite nano superabsorbent resin with water absorption ≥ 1106g/g, resistant to Salt rate ≥ 145.3g/g.
[0025] like figure 1 As shown, use the SIRION-100 scanning electron microscope (FEI, USA) to observe the particle morphology characteristics of the material; as figure 2 As shown, in order to observe its porous network structure, the resin was fully swollen, freeze-dried and used for structural characterization (SEM, Hitachi, S-3000N; Gatan, Alto-2100), and the sample must be gold-plated before testing.


Water absorption>= 678.3
Water absorption>= 736.7
Water absorption>= 1106.0

Description & Claims & Application Information

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