Degradation-controllable superabsorbent resin and its preparation method
A technology of superabsorbent resin and polyether polyurethane, applied in chemical instruments and methods, physical/chemical process catalysts, soil conditioning materials, etc., can solve the problems of lack of controllable degradation
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Embodiment 1
[0045] The preparation method of solid acid catalyst: firstly ZrOCl 2 ·8H 2 O was dissolved in distilled water, and the concentrated ammonia water with a concentration of 10 mol / L was slowly added under stirring, and the pH value was adjusted to 9 to form a gel, and then aged at room temperature until the upper layer solution was clear, suction filtered, and washed until no Cl - detected as Zr(OH) 4 , followed by Zr(OH) 4 Place in a 105 ℃ oven to dry for 20h, grind into fine powder, pass through a 120 mesh sieve to obtain solid powder, and then use dilute H with a concentration of 1.0mol / L 2 SO 4 After impregnation, suction filtration, drying the filter cake in an oven at 100 °C for 20 hours, and finally calcining at 650 °C for 1 hour, pulverizing it into fine powder, and passing through a 200-mesh sieve to obtain a solid acid catalyst.
Embodiment 2
[0047] The preparation method of solid acid catalyst: firstly ZrOCl 2 ·8H 2Dissolve O in distilled water, slowly add concentrated ammonia water with a concentration of 12 mol / L under stirring, adjust the pH value to 9.5, and form a gel, then age at room temperature until the upper layer solution is clear, filter with suction, and wash until there is no Cl - was detected, and Zr(OH) was obtained 4 , followed by Zr(OH) 4 Dry in an oven at 108°C for 22 hours, grind into a fine powder, pass through a 135-mesh sieve to obtain a solid powder, and then use dilute H with a concentration of 1.2mol / L 2 SO 4 After impregnation, filter with suction, dry the filter cake in an oven at 102°C for 22 hours, and finally roast it at 675°C for 2 hours, grind it into fine powder, and pass it through a 225-mesh sieve to obtain a solid acid catalyst.
Embodiment 3
[0049] The preparation method of solid acid catalyst: first ZrOCl 2 ·8H 2 Dissolve O in distilled water, slowly add concentrated ammonia water with a concentration of 13mol / L under stirring, adjust the pH value to 10, and form a gel, then age at room temperature until the upper layer solution is clear, filter with suction, and wash until there is no Cl - was detected, and Zr(OH) was obtained 4 , followed by Zr(OH) 4 Dry in an oven at 110°C for 24 hours, grind into a fine powder, pass through a 150-mesh sieve to obtain a solid powder, and then use dilute H with a concentration of 1.5mol / L 2 SO 4 After impregnation, filter with suction, dry the filter cake in an oven at 105°C for 24 hours, and finally roast it at 700°C for 3 hours, grind it into fine powder, and pass through a 250-mesh sieve to obtain a solid acid catalyst.
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