Preparation method of super absorbent resin with high return permeability resistance
A high water-absorbent resin and back seepage technology, applied in the direction of absorbent pads, etc., can solve the problems of affecting product application experience and large amount of back seepage, so as to improve the liquid absorption speed and anti back seepage performance, excellent anti back seepage performance, The effect of shortening the polymerization reaction time
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Embodiment 1
[0019] Embodiment 1, a kind of preparation method of superabsorbent resin with high anti-back seepage performance, its steps are as follows:
[0020] (1) After diluting acrylic acid with water, add sodium hydroxide in an ice-water bath to neutralize to obtain a neutralization solution. The neutralization degree of the neutralization solution is 0%-80%, and the mass of acrylic acid accounts for 20% of the total mass of the neutralization solution. %-35%;
[0021] (2) After adding composite photoinitiator, crosslinking agent and foaming agent into the neutralization solution and stirring evenly, carry out polymerization reaction under UV light irradiation, control the polymerization initiation temperature at 0-60°C, and obtain hydrogel; The quality of the composite photoinitiator is 0.001%-0.3% of the total amount of acrylic acid in the neutralizing solution; the quality of the crosslinking agent is 0.01%-0.6% of the total amount of acrylic acid in the neutralizing solution; the...
Embodiment 2
[0024] Embodiment 2, a preparation method of a superabsorbent resin with high anti-back seepage performance, the steps are as follows:
[0025] (1) After diluting 200g of high-purity acrylic acid with 466g of water, add 150g of 50% sodium hydroxide in an ice-water bath to neutralize to obtain a neutralizing solution;
[0026] (2) Add 0.05g of 2,2-dimethoxy-2-phenylacetophenone, 0.8g of sodium persulfate, 0.4g of polyethylene glycol 600 and 2g of sodium bicarbonate into the neutralization solution and stir well , control the polymerization initiation temperature at 7°C, initiate the polymerization reaction under UV light irradiation, the UV light wavelength is 150-350nm, and obtain a hydrogel after 30 minutes of light irradiation;
[0027] (3) Add the hydrogel to the rubber cutting granulator to make granules, and add 10g of sodium carbonate evenly during the granulation process to adjust the neutralization degree of the acrylic acid monomer in the gel, so that the pH value of ...
Embodiment 3
[0029] Embodiment 3, a preparation method of a superabsorbent resin with high anti-back seepage performance, the steps are as follows:
[0030] (1) After diluting 190g of high-purity acrylic acid with 515g of water, add 84g of 50% sodium hydroxide in an ice-water bath to neutralize to obtain a neutralizing solution;
[0031] (2) Add 0.04g of 2,2-dimethoxy-2-phenylacetophenone, 0.75g of sodium persulfate, 0.36g of polyethylene glycol 400 and 2.5g of sodium bicarbonate into the neutralizing solution and stir well Finally, the polymerization initiation temperature was controlled at 6°C, and the polymerization reaction was initiated under UV light irradiation, and the hydrogel was obtained after 30 minutes of light irradiation;
[0032] (3) Add the hydrogel to the rubber cutting granulator to make granules, and add 63g of 50% sodium hydroxide evenly during the granulation process to adjust the neutralization degree of the acrylic acid monomer in the gel, so that the pH of the gel ...
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