Method for producing superabsorbent polymer
A superabsorbent and polymer technology, applied in the field of superabsorbent polymer preparation, can solve the problems of superabsorbent polymer separation, proportional reduction of absorption rate, silica dust, etc., and achieve excellent absorption-related physical properties , to achieve the effect of anti-caking
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[0116] Preparation of base resin - Examples and Comparative Examples
[0117] A monomer composition was prepared by mixing 100 parts by weight of acrylic acid, 126.8 parts by weight of 31.5% caustic soda (NaOH), 46 parts by weight of water, and the following components.
[0118] - Internal crosslinking agent: 0.2 parts by weight (2000 ppmw) of polyethylene glycol diacrylate (PEGDA; Mw=400)
[0119] - Polymerization initiator: 0.008 parts by weight (80ppmw) of bis(2,4,6-trimethylbenzoyl) phenylphosphine oxide (photoinitiator) and 0.12 parts by weight (1200ppmw) of sodium persulfate (thermal initiator agent)
[0120] Then, the monomer composition was introduced into a supply unit of a polymerization reactor with a continuously moving conveyor belt, and was irradiated with ultraviolet rays (about 2 mW / cm 2 ) was irradiated for 1.5 minutes, followed by polymerization to obtain a hydrogel polymer as a product.
[0121] Cut the hydrogel polymer with a cutter. Then, the hydro...
Embodiment 1
[0125] Base resins having the following particle size distributions were prepared using the base resins prepared above and standard sieves.
[0126] #20 to #30: 22% by weight, #30 to #50: 64% by weight, #50 to #100: 13% by weight, #100: 1% by weight
[0127] Based on 100 parts by weight of the base resin, by adding about 5.4 parts by weight of water, about 1.8 parts by weight of ethylene carbonate and propylene carbonate (1:1), about 0.58 parts by weight of propylene glycol and 0.24 parts by weight of aluminum sulfate Mix to prepare a surface crosslinking solution.
[0128] The surface crosslinking solution was added to 100 parts by weight of the base resin powder, and mixed well while stirring at about 1000 rpm for about 30 seconds using a mixer.
[0129] This was put into a reactor, and was subjected to a surface crosslinking reaction (first surface crosslinking) while raising the temperature to about 168° C. over about 30 minutes.
[0130] Thereafter, the surface crosslin...
Embodiment 2
[0134] Base resins having the following particle size distributions were prepared using the base resins prepared above and standard sieves.
[0135] #20 to #30: 22% by weight, #30 to #50: 64% by weight, #50 to #100: 13% by weight, #100: 1% by weight
[0136] Based on 100 parts by weight of the base resin, by adding about 5.4 parts by weight of water, about 1.8 parts by weight of ethylene carbonate and propylene carbonate (1:1), about 0.58 parts by weight of propylene glycol and 0.24 parts by weight of aluminum sulfate Mix to prepare a surface crosslinking solution.
[0137] The surface crosslinking solution was added to 100 parts by weight of the base resin powder, and mixed well while stirring at about 1000 rpm for about 30 seconds using a mixer.
[0138] This was put into a reactor, and was subjected to a surface crosslinking reaction (first surface crosslinking) while raising the temperature to about 170° C. over about 30 minutes.
[0139] Thereafter, the surface crosslin...
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