摘要
以玉米淀粉为主要原料,AA/AM为单体,采用反相悬浮聚合法制备缓释肥高吸水包膜材料,讨论引发剂用量、交联剂用量、AA/AM质量比、AA/淀粉质量比及丙烯酸中和度对材料吸液率、耐热及耐寒性能以及表观和微观形态的影响。结果表明,当引发剂过硫酸铵用量为0.38%,交联剂N,N’-亚甲基双丙烯酰胺用量为0.029%,AA/淀粉为4.3/1,单体AA/AM为3.7/1,AA中和度为63%,反应温度60℃,反应时间3 h时,包膜材料呈现高密度蜂孔状,吸水率达到770.74 g/g,吸自来水率为116.44 g/g,吸盐水率为87.78 g/g。包膜材料具有较好的耐热及耐寒性能,经75℃高温处理48 h后,吸水率为260.90 g/g,吸自来水率为74.18 g/g,吸盐水率为71.84 g/g;经-20℃低温处理48 h后,吸水率为388.82 g/g,吸自来水率为93.80 g/g,吸盐水率为55.54 g/g。
With corn starch as the main raw material and AA/AM as monomer,the super-absorbent coating material was prepared by reversed-phase suspension polymerization.The effects of initiator dosage,crosslinking agent dosage,AA/AM mass ratio,AA/starch mass ratio and neutralization degree of acrylic acid on water absorption,heat and cold resistance,surface morphology and micro-morphology of the coating material were discussed.The results showed that when the dosage of initiator ammonium persulfate was 0.38%,cross-linking agent N,N’-methylene diacrylamide was 0.029%,AA/starch was 4.3/1,AA/AM was 3.7/1,degree of neutralization AA was 63%,the reaction temperature was 60℃and the reaction time was 3 h,the coating material presented a high-density honeycomb shape,with distilled water absorption rate of 770.74 g/g,tap water absorption rate of 116.44 g/g and saline water absorption rate of 87.78 g/g.The coating material had good heat and cold resistance,after treated at 75℃for48 h,the distilled water absorption rate was 260.90 g/g,the tap water absorption rate was 74.18 g/g,and the saline water absorption rate was 71.84 g/g.While the coating material was treated at-20℃during48 h,the distilled water absorption rate was 388.82 g/g,the tap water absorption rate was 93.80 g/g,and the saline absorption rate was 55.54 g/g.
作者
王雪郦
张芮瑞
周少奇
WANG Xue-li;ZHANG Rui-rui;ZHOU Shao-qi(Guizhou Province Key Laboratory of Fermentation Engineering and Biological Pharmacy,Guizhou University,Guiyang 550025,China;Science Life College,Guizhou University,Guiyang 550025,China;School of Liquor and Food Engineering,Guizhou University,Guiyang 550025,China;Guizhou Academy of Sciences,Guiyang 550001,China)
出处
《应用化工》
CAS
CSCD
北大核心
2020年第5期1167-1171,1174,共6页
Applied Chemical Industry
基金
贵州科技厅联合基金项目(黔科合LH字[2016]7452号)
中国轻工业浓香型白酒固态发酵重点实验室开放基金项目(2017JJ002)。
关键词
高吸水包膜材料
玉米淀粉
接枝共聚
吸水率
super-absorbent coating material
corn starch
graft co-polymerization
water absorption
