Polyaspartic acid gel and preparation method thereof
A technology of polyaspartic acid gel and polyaspartic acid, which is applied in the field of polymer water-absorbing materials, can solve the problems of no clear use and no water-absorbing function, and achieve good water-absorbing properties
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[0010] 1. Synthesis of modified polysuccinimide (t-PSI) by grafting allylamine
[0011] In a protective gas, dissolve polysuccinimide (PSI) in a dry polar solvent, concentrate with allylamine (arylamine) under reduced pressure distillation at 40-45°C, and reprecipitate with methanol to obtain Solid matter; the solid matter is washed with methanol and dried under vacuum at a temperature of 50-60° C. to obtain modified polysuccinimide (t-PSI).
[0012] 2. Synthesis of modified polyaspartic acid (t-PAsp) by hydrolysis of NaOH aqueous solution
[0013] Hydrolyze the modified polysuccinimide (t-PSI) with NaOH aqueous solution (NaOHaq.) in an ice bath, reprecipitate and wash the product with methanol, and dry the obtained solid in vacuum at a temperature of 50-60°C , to obtain modified polyaspartic acid (t-PAsp).
[0014] 3. Synthesis of polyaspartic acid gel (PAspgel)
[0015] Dissolve modified polyaspartic acid (t-PAsp) in water under ice bath, add ammonium persulfate (APS) as ...
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