Process for preparing high hydroscopicity resin from polyacrylonitrile powder
A super absorbent resin, polyacrylonitrile powder technology, applied in the polymer field, can solve the problems of poor salt resistance and application limitations, and achieve the effects of good salt resistance, uniform particles, and fast water absorption rate
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Embodiment 1
[0017] Add polyacrylonitrile powder (dry-process acrylic fiber process product, Mn is about 30,000) 40g, solid sodium hydroxide 20g, deionized water 20ml, isobutylene in the 500ml four-neck flask equipped with stirrer, reflux condenser and thermometer. Alcohol 200ml, start stirring, begin to slowly heat up, be warmed up to about 95 ℃, material begins to boil. The hydrolysis reaction was carried out in a boiling state for 6 hours, and the reaction was stopped by cooling down. Filter out the solid material, and obtain a colorless or light yellow granular product with uniform particles after drying, with a particle size of about 200-300 μm. The water absorption of the product is 2400 times, and the absorption of normal saline is 160 times.
Embodiment 2-4
[0023] The operation method is the same as that in Example 1, except that the hydrolyzed raw materials used are waste dry powder produced by dry-process acrylic fiber device, dried dry powder from wet-process acrylic fiber device, and dried dry powder of high molecular weight polyacrylonitrile homopolymer obtained by emulsion polymerization. A colorless or light yellow granular product with uniform particles is obtained, and the water absorption times of the product are 2300 times, 2500 times and 3000 times respectively.
Embodiment 5-10
[0025] The operation method is the same as in Example 1, except that the alcohol compounds added are respectively methanol, ethanol, isopropanol, n-propanol, tert-amyl alcohol and n-octanol, and the hydrolysis temperature is the boiling temperature of the reaction medium. Obtain a colorless or light yellow granular product with uniform particles. The water absorption multiples of the product are 350 times, 620 times, 1500 times, 1850, 2600, 1800, respectively, and the salt water absorption multiples are 35 times, 60 times, 100 times, 120 times, 190 times, 125 times.
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