Process for the preparation of superabsorbent polymers
A superabsorbent, polymer technology, applied in absorbent pads, bandages, medical science, etc., can solve problems such as effective cross-linking difficulties, and achieve the effect of improving absorption characteristics and improving properties
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preparation example Construction
[0022] A method for producing a superabsorbent polymer comprises the steps of: performing thermal polymerization or photopolymerization of a monomer composition comprising a water-soluble ethylenically unsaturated monomer and a polymerization initiator to form a hydrogel polymer; drying the hydrogel polymer; milling the dried polymer; and mixing the milled polymer with a surface crosslinking agent comprising a hydrophobic alcohol to perform a surface crosslinking reaction.
[0023] For reference, "polymer" as used herein means a state in which a water-soluble ethylenically unsaturated monomer is polymerized, and may include those of all water content ranges or particle diameter ranges. Among polymers, those having a water content of about 40% by weight or more after polymerization and before drying may be referred to as hydrogel polymers.
[0024] Also, "base resin" or "base resin powder" means a powder form of a polymer produced by drying and grinding.
[0025] Furthermore, ...
preparation example
[0078] Preparation Example: Preparation of Base Resin
[0079] 100g of acrylic acid, 121.5g of 32% caustic soda (NaOH), 0.2g of sodium persulfate as a thermal polymerization initiator, 0.008g of diphenyl (2,4,6-trimethylbenzoyl) as a photopolymerization initiator ) phosphine oxide, 0.23 g of polyethylene glycol diacrylate (PEGDA, product name: Mirama 280, available from Miwon Chemical, weight average molecular weight: 400 g / mol) and 36.6 g of water were mixed to prepare acrylic acid concentration of 46% by weight monomer composition.
[0080] The monomer composition was fed at a feed rate of 500 mL / minute to 2,000 mL / minute onto a rotating belt having a width of 10 cm, a length of 2 m, and rotating at a speed of 50 cm / minute. While feeding the monomer composition, at 10mW / cm 2 The intensity of UV is irradiated to carry out the polymerization reaction for 60 seconds. After polymerization was complete, the product was cut through a meat grinder and dried using a convection o...
Embodiment 1
[0083] Mix 100 g of the base resin of the preparation example (centrifuge retention capacity (CRC) 50 g / g, absorbency under load (AUL) 7.8 g / g) with 3.2 g of water, 4.0 g of methanol, 0.088 g of 2,2-dimethyl-1 , 3-propanediol and 0.008g of silica (product name DM30S) were mixed to carry out a surface crosslinking reaction at 185°C for 60 minutes.
[0084] After the surface crosslinking reaction, sieve with an ASTM standard sieve to obtain a superabsorbent polymer with a particle size of 150 μm to 850 μm.
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