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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
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the comprehensive properties of polyacrylic resins are not satisfactory, such as salt resistance, water absorption speed and gel strength, so researchers are committed to improving their properties.

Method used

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  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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 re...

Embodiment 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.

Embodiment 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.

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Abstract

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.

Description

technical field [0001] The invention relates to a preparation method of superabsorbent resin, in particular to a preparation method of poly(acrylic acid-acrylamide) / hydrotalcite nanocomposite superabsorbent resin synthesized by hydrotalcite. Background technique [0002] Superabsorbent resin is a new type of functional polymer material that has been developed rapidly in the past ten years. This material is a low-crosslinked hydrophilic polymer compound with a loose network structure. It is neither soluble in water nor It is also difficult to dissolve in organic solvents. Compared with ordinary water-absorbing materials, it can absorb hundreds or even thousands of times its own mass of water, and has a fast water absorption speed and good water retention performance. Even if it is pressurized, it is difficult to separate water. Therefore, it is widely used in agriculture, gardening, hygienic materials and hydrogel materials, etc. [0003] The superabsorbent resins that have ...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F2/44C08K9/04C08F220/56
Inventor 张林张亚涛陈欢林
Owner ZHEJIANG UNIV
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