Preparation method of biodegradable high-hydroscopicity compound resin
A superabsorbent resin and biodegradable technology, applied in the field of biodegradable polyaspartic acid inorganic particle composite superabsorbent resin and its preparation, can solve the problems of high cost and complicated process, and achieve the improvement of salt tolerance, Improve interaction and facilitate long-term preservation
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[0028] Step 2. Preparation of non-aqueous polar phase: dissolve polysuccinimide in N,N-dimethylformamide solution, add quantitative cross-linking agent solution and modified inorganic particles, and stir for 5-15 minutes , wherein: the mass ratio of the polysuccinimide to N,N-dimethylformamide is 1~3:10; the mass ratio of the solute crosslinking agent in the crosslinking agent solution to the polysuccinimide The ratio is 3 to 6: 100; the mass ratio of the modified inorganic particles to polysuccinimide is 1 to 10: 100; in the crosslinking agent solution, the concentration of the crosslinking agent is 12 to 18g / 100ml.
[0029] Step 3. Dissolve the surfactant in the oil phase medium, then mix it with the non-aqueous polar phase prepared in the above step 2, control the rotation speed at 150-400r / min, and react at 35-55°C for 2-4 hours to obtain red Brown solid particles, and the oily phase was recovered. Wherein: the mass ratio of the surfactant to the oil phase is 1-5:100; t...
Embodiment 1
[0035] (1) Add 0.5g of silane coupling agent γ-aminopropyltriethoxysilane to the mixture of 40ml of ethanol and 10ml of distilled water, adjust the pH to 9 with 2 mol / L hydrochloric acid, stir at room temperature for 20min to partially hydrolyze ; In a 500ml three-necked flask, disperse 50g of kaolin in 100ml of deionized water, then take 15min as an interval, add the above gamma-aminopropyltriethoxysilane hydrolyzate in 4 times, adjust with 2mol / L hydrochloric acid The pH is always around 9, and the temperature is controlled at 60-85°C; after the γ-aminopropyltriethoxysilane hydrolyzate is added, the reaction is continued for 3 hours under the above reaction conditions; the dispersion is filtered and washed repeatedly with deionized water The filter residue is neutral, dried and ground at 80°C.
[0036] (2) Dissolve 40g of polysuccinimide in 200ml of N,N-dimethylformamide, then add 10ml of hexamethylenediamine solution (14g / 100ml) and 1.2g of modified kaolin, and stir for 10min...
Embodiment 2
[0040] (1) Add 1.5g of silane coupling agent γ-aminopropyltrimethoxysilane to a mixture of 40ml of ethanol and 10ml of distilled water, adjust the pH to 9 with 2 mol / L hydrochloric acid, and stir at room temperature for 20 minutes to partially hydrolyze; In a 500ml three-necked flask, 50g of montmorillonite was dispersed in 250ml of deionized water, and the following process was the same as step (1) of Example 1.
[0041] (2) Dissolve 60g of polysuccinimide in 200ml of N,N-dimethylformamide, then add 10ml of propylenediamine solution (18g / 100ml) and 6g of modified montmorillonite particles, and stir for 10min .
[0042] (3) Using the inverse suspension method, first fully dissolve 16g of Span 80 and 4g of Tween 80 in 800ml of liquid paraffin, then mix with the non-aqueous polar phase prepared in the previous step, control the speed at 400r / min, and set the temperature at 35°C The reaction was carried out for 2 hours to obtain reddish-brown solid particles, and the oil pha...
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