制备工艺对标签胶性能影响的研究

以脱脂大豆粉(SF)为原料制备豆粉标签胶,主要研究了制备工艺(包括液料比、尿素加量、交联剂加量、处理时间和处理温度)对豆粉标签胶黏度、粘接性能和耐水性能的影响,并借助红外光谱对标签胶进行分析与表征。研究结果表明,豆粉标签胶的最佳制备工艺为:m(水):m(SF)为3.0:1.0,尿素加量100%,交联剂加量4.5%(占SF质量),处理温度70℃,处理时间1.0 h。此条件制备的豆粉标签胶黏度为32450mPa.s,粘接力177 N,耐常温水性(20±2)℃≥104h,远高于标签胶行业标准规定的72 h要求。FT-IR分析表明,加入交联剂后,大豆蛋白在波数为1 168 cm~(-1)处产生新特征峰,这可能是该研究豆粉标签胶具有较佳耐水性能原因所在。     

Seed oils rich in linolenic acid as renewable feedstock for environment-friendly crosslinkers in powder coatings

In the work described, seed oils rich in linolenic acid were used for the synthesis of aliphatic oxiranes. The oils studied were linseed (Linum usitatissimum) oil, Canadian linseed oil and the oil of Lallemantia iberica. The oils contained 54.1, 60.2 and 68.0% of linolenic acid, respectively, and showed high theoretical iodine values of 211, 226 and 236 g/hg. Unsaturations in the oils were used to introduce epoxides by epoxidation with in situ generated peroxyacetic acid. The epoxidized oils, showing high percentages of oxirane oxygen (9.4, 10.0 and 10.7%), were applied as crosslinkers in powder-coating formulations. The major advantage of these types of crosslinkers is that they are neither toxic nor mutagenic, in contrast with the widely applied synthetic triglycidyl isocyanurate (TGIC) crosslinkers. However, two potential problems exist when aliphatic oxiranes are compared with conventional TGIC systems. A decrease in glass transition temperature (T_g) of the powder formulation and a higher degree of yellowing of the coating are often observed. In this paper the effects of using oils containing high linolenic acid contents on the yellowing of the coating and the T_g of the powder, are studied. It appeared that aliphatic oxiranes are suitable as environment-friendly crosslinkers in powder-coating systems.     

聚丙烯酰胺/魔芋胶压裂液的研制

[目的]研制出聚丙烯酰胺/魔芋胶压裂液。[方法]基于魔芋葡甘聚糖和聚丙烯酰胺的协同增稠效应,制备出聚丙烯酰胺/魔芋胶复合型稠化剂,以有机硼为交联剂,加入杀菌剂、抗氧化剂、黏土稳定剂等添加剂,研制出聚丙烯酰胺/魔芋胶压裂液,并对其性能进行评价。[结果]该压裂液是非牛顿流体,具有较好的耐剪切性、易破胶、低滤失、残渣少、伤害低的特点。[结论]聚丙烯酰胺/魔芋胶压裂液满足油田压裂液的应用要求。