Absorbent polymer and method of preparing the same
A water-absorbing, resin-based technology, used in absorbent pads, bandages, medical science, etc., can solve the problems of high reactivity, difficult to obtain polymer compositions, low solubility, etc., to reduce water-soluble components, improve water-absorbing capacity and penetration. The effect of improving the uniformity and uniformity
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[0033] The present invention relates to a water-absorbent resin and a preparation method thereof, and more specifically, to a water-absorbent resin satisfying the following physical properties and a preparation method thereof: the water-absorbent ratio of the water-absorbent resin under pressure is 20 to 45 g / g ; The rate of hydrolysis is 0.01 to 0.2cp / min; the time for the hydrolyzate to reach the maximum viscosity is 60 to 180 minutes.
[0034] Specific examples of the superabsorbent resin of the present invention will be described in detail below.
[0035] The hydrolysis speed in the present invention represents, in the sodium hydroxide (NaOH) of 10g, add ultrapure water and make the hydrolyzate of 1kg, at 25 ℃, while the hydrolyzate of 1kg made above is rotated with 500rpm, Put 10g of water-absorbent resin into the hydrolyzate, then stir for 30 minutes, and take out 40g of the solution with a pipette with an inlet size of at least 5mm or more in the state of the reaction s...
Embodiment 1
[0073] 400 g of acrylic acid and 340 g of ultrapure water (Mili-Q integral 3; Millipore Corporation) were mixed, and an aqueous acrylic acid solution was prepared. After dissolving 70 mol% sodium hydroxide (NaOH) in terms of acrylic acid in 400 g of ultrapure water, it was cooled to 10° C., and then slowly poured into the acrylic acid aqueous solution. Under the condition of 10°C, nitrogen purging (purging) was carried out for 30 minutes, after which, 0.4915 g of potassium metabisulfite (K 2 S 2 o 8 ), 0.2457g of 1-hydroxycyclohexyl phenyl ketone. Add 2.457g of sodium bicarbonate (NaHCO 3 ), immediately irradiate 1mw / cm 2 UV light for 1 min, and after removing the light, let it stand for 6 min to obtain an aqueous gel. Cut the resulting aqueous gel into 1 cm 3 After the size was obtained, it was passed through a bell mixer (SFD-G: SHINSUNG Co., Ltd.) together with 20 g of an aqueous solution obtained by diluting 0.5 parts by weight of isosorbide based on 100 parts by wei...
Embodiment 2 to 12 and comparative example 2 to 5
[0077] A water absorbent resin was prepared by the same method as in Example 1 except that a crosslinking additive was used in the kind and content shown in Table 1 below.
[0078] Table 1
[0079]
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