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文章采用自然过滤法研究高吸水性淀粉吸水倍率的测定条件,考察了样品颗粒大小、网筛孔径、水用量、吸水时间、滤水时间、吸液种类、温度及pH值等对高吸水性淀粉吸水倍率测定结果的影响。实验结果表明:高吸水性淀粉吸水倍率最佳测定条件为:颗粒大小为120～150目,滤网孔径为100目,去离子水用量与高吸水性淀粉质量比为1 200:1,吸水时间为40 min,滤水时间为60 min,吸液pH=7。在该条件下测定的吸水倍率能反映高吸水性淀粉的真实吸水倍率;吸液温度对测定结果几乎无影响;氯化钠溶液显著降低了高吸水性淀粉的吸水倍率,浓度越高则吸水倍率降低越多。
In this paper, the natural filtration method was used to study the measurement conditions of water absorption capacity of super absorbent starch. The effects of sample size, mesh size, water consumption, water absorption time, water filtration time, liquid absorption type, temperature and pH on the properties of superabsorbent starch Impact of water absorption ratio measurement results. The experimental results showed that the optimum conditions of water absorption capacity of super absorbent starch were as follows: the particle size was 120-150 mesh, the mesh size was 100 mesh, the mass ratio of deionized water to super absorbent starch was 1 200: 1, the water absorption time 40 min, drainage time 60 min, suction pH = 7. Under these conditions, the measured water absorption capacity can reflect the true water absorption capacity of super absorbent starch; liquid absorption temperature has little effect on the measurement results; sodium chloride solution significantly reduces the water absorption capacity of super absorbent starch, the higher the concentration, the water absorption capacity Lower the more.