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Preparation of self-diffusion salt tolerant acroleic acid high hydroscopicity resin

The technology of super absorbent resin and acrylic acid is applied in the field of preparation of self-dispersed salt-resistant acrylic super absorbent resin, which can solve the problems of low transparency and reduce the particle size of precipitated polymer, and achieves simple process, good salt resistance, Fast dispersion effect

Active Publication Date: 2009-07-15
NANJING WELL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] U.S. Patent 4692502 discloses a method for polymerizing acrylic acid in an organic medium with a single cross-linking agent and a free radical initiator, and uses a surfactant to reduce the accumulation of the polymer in the reactor and obtain a more ideal particle size of the precipitated polymer , so as to obtain an acrylic resin with fast dispersion speed and salt resistance, but the transparency of its glue is not high after neutralization, which is greatly restricted in the cosmetics industry that requires high transparency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 90g of refined acrylic acid into a 1000ml four-necked flask, add 250g of ethyl acetate, 250g of cyclohexane, 2.65g of octadecyl methacrylate, then add 0.14g of azobisisoheptanonitrile, 2g of ethylene glycol acrylate, 0.3 gAGF13. Under the protection of nitrogen, start stirring and control the reaction temperature at 45-50°C. Within half an hour, the solution becomes turbid due to polymerization precipitation, indicating that the polymerization reaction is normal. After several hours, the reaction mixture becomes a viscous suspension. The reaction was carried out continuously for 8 hours, and then the polymer was moved to a one-necked flask, and the solvent was removed in vacuum with a rotary evaporator, the temperature of the evaporator was 80-85°C, and the vacuum degree was 0.1MPa. The dried polymer was a fine white powder. Put it into DM water to swell and form a viscous colloid after neutralization.

[0027] Polymer Characterization

[0028] Transparency detect...

Embodiment 2

[0034] Experimental condition is the same as embodiment 1, and difference is that cross-linking agent is ethylene glycol acrylate 0.5g, AGF131.5g, and the product dispersion time that reaction finishes making is 7 minutes, transparency 87%, η 水 is 44Pa.s, μ is 57%.

Embodiment 3

[0036] The experimental conditions are the same as in Example 1, except that the crosslinking agent is 2 g of allyl glycol ether, 0.3 g of sucrose acrylate, and the dispersion time of the product obtained after the reaction is finished is 9 minutes, and the transparency is 90%, and η 水 is 47Pa.s, μ is 57%.

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Abstract

The invention relates to a preparation method of self-dispersing salt-resistance type acrylic high-absorbent resin; the method is characterized in that the method comprises the following steps: (1) refined acrylic acid and metacrylic acid ester or acrylic ester is added into a reaction kettle, and organic mixed solvent, compound cross linkers, and evocating agents are added; (2) stirring and polymerization are carried out under the protection of nitrogen, and the reaction temperature is controlled to be 45-50 DEG. C, and the polymerization reaction is carried out until the reaction mixture changes into a viscous suspending liquid (the required time is a plurality of hours); (3) the polymer is displaced in a one-port flask, and then the organic mixed solvent is removed; and (4) vacuum drying and grinding are carried out for obtaining the self-dispersing salt-resistance type acrylic high-absorbent resin which is thin white powder. The method overcomes the disadvantages in the prior art, leads the polymerized products to have uniform molecular weight, rapid dispersing speed and good salt resistance; in addition, the transparency is high; and the method has simple process, is economic and reasonable, and is suitable for industrial production.

Description

technical field [0001] The present invention relates to a preparation method of a self-dispersing salt-resistant acrylic superabsorbent resin, in particular, the present invention relates to the research on the technical formula of acrylic water-absorbent resin, including polymerization comonomer, initiator and crosslinking agent Type selection and dosage control and other related technologies. Background technique [0002] Self-dispersing salt-resistant acrylic superabsorbent resin is a new type of functional polymer material with a three-dimensional network structure, which can absorb water hundreds or even thousands of times its own weight. Compared with general acrylic water-absorbent resins, it has more High self-dispersion and higher salt resistance. In recent years, acrylic water-absorbing resins such as Carbomer 940 and 934 have been widely used in ointments, creams, liniments, cataplasms, etc., which have the functions of moisturizing, skin infiltration, thickening...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08J3/12
Inventor 彭文勇沈德渊贾建国高正松
Owner NANJING WELL CHEM
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