Preparation method of super water absorbent resin
A high water-absorbent resin, water-soluble technology, applied in the field of polymer preparation, can solve the problems of difficult control of product particle size and particle size distribution, unstable suspension dispersion system, sticking and agglomeration, etc., to achieve high water retention capacity, absorption The effect of fast liquid speed and high water absorption capacity
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Embodiment 1
[0031] Embodiment 1: the n-heptane that takes by weighing 210g is put into the five-necked 500ml spherical flask that reflux condenser, dropping funnel, thermometer, nitrogen gas inlet tube and stirring paddle are equipped with. Add 0.2g of SPAN-20, 0.2g of SPAN-60, and 0.6g of triglycerol monostearate to the n-heptane in the flask, heat up to 70°C while stirring to dissolve the surfactant, stir at 300rpm, and cool to 50°C.
[0032] Weigh 18g of acrylic acid and 15.8g of deionized water in the Erlenmeyer flask, dropwise add 23.3g of 32% (mass percentage) sodium hydroxide aqueous solution while cooling from the outside, and after 75% (mol percentage) neutralization, add 5% ( Mass percent) potassium persulfate aqueous solution 0.54g, 2.5% (mass percent) N,N-methylenebisacrylamide aqueous solution 0.29g, add 40% (mass percent) silica sol 1.8g, stir well, and prepare the first 1-step monomer aqueous solution. Add all the monomer aqueous solution in the first step into the above-...
Embodiment 2
[0035] Example 2: Except when preparing the monomer aqueous solution in the first step in Example 1, the addition content is 40% (mass percentage) silica sol becomes 0.9g, when preparing the monomer aqueous solution in the second step, the addition content is 40% (mass percentage) silica sol becomes 1.25g, other is the same as embodiment 1.
Embodiment 3
[0036] Embodiment 3: except that when preparing the monomer aqueous solution of the 1st step in embodiment 1, do not add silica sol, when preparing the monomer aqueous solution of the 2nd step, do not add silica sol, other is the same as embodiment 1.
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