无溶剂型室温固化双组分聚氨酯胶粘剂的制备及应用

以蓖麻油、3,3’-二氯-4,4’-二氨基-二苯基甲烷(MOCA)、填料等为甲组分,蓖麻油、甲苯二异氰酸酯(TDI)合成乙组分,制备了无溶剂型室温固化双组分聚氨酯胶粘剂。考察了甲组分中MOCA含量对胶粘剂固化时间的影响,以及该胶粘剂的甲乙组分质量比、填料品种、硅烷偶联剂及浸水处理对铝合金和硫化天然橡胶胶接性能的影响,并进行热失重分析。结果表明,当MOCA质量分数为甲组分的3%、m甲/m乙为10∶3、填料为400目CaCO3时,铝合金和硫化天然橡胶表面用0.5%的KH-550乙醇溶液处理后,胶接性能和耐水性较好,胶膜的初始热分解温度大于200℃,可以满足高速列车车厢的橡胶地板与铝合金底板的粘结。     

环氧无溶剂防腐涂料耐酸性的研究

选用低粘度环氧树脂制备无溶剂防腐涂料,通过正交实验取得了耐酸性较好的优化配比。分析结果表明固化剂是影响涂料耐酸性的主要因素,应用正交设计试验方法缩短了试验时间。     

无溶剂萃取技术在食品中农药残留分析的研究进展

无溶剂萃取技术是一种先进的样品制备与前处理技术,常用的有气相萃取、超临界流体萃取、固相萃取、固相微萃取等方法。本文综述了无溶剂萃取技术的基本原理及在食品中农药残留的研究应用进展。     

聚酯亚胺F,H级无溶剂滴浸漆的研究

以赛克改性聚酯亚胺树脂为基础树脂，研制出低温快速固化Ｆ、Ｈ级通用无溶剂滴浸漆。ｔ－Ｔ、η－Ｔ特性曲线说明该漆具有优异的工艺特性。热分析、富里叶红外光谱分析结果表明。聚酯亚胺树脂的结构组成是影响无溶剂漆的耐热性、介电性等性能的关键因素。     

微波条件下SiO_2/K_2CO_3促进的无溶剂法由肉桂醛/NH_2OH·HCl直接制备肉桂腈

以肉桂醛为原料,在无溶剂的条件下SiO2/K2CO3促进一步法直接制备肉桂腈。确定的最佳反应条件是:当肉桂醛∶盐酸羟胺∶碳酸钾=1∶1.5∶0.85(摩尔比),SiO2用量为每mmol肉桂醛0.3~0.4 g,室温下彻底研磨均匀后,以微波730 W火力加热4~5 min,制备效果最佳。在此条件下从肉桂醛制备肉桂腈的平均得率达90.3%。     

无溶剂环氧自流平涂料的研制

讨论了无溶剂环氧自流平涂料的配方设计，介绍了产品的特点，用途及技术指标。     

Elucidation of acyl migration during lipase-catalyzed production of structured phospholipids

Elucidation of acyl migration was carried out in the Lipozyme RM IM (Rhizomucor miehei)-catalyzed transesterification between soybean phosphatidylcholine (PC) and caprylic acid in solvent-free media. A five-factor response surface design was used to evaluate the influence of five major factors and their relationships. The five factors—enzyme dosage, reaction temperature, water addition, reaction time, and substrate ratio—were varied on three levels together with two star points. Enzyme dosage, reaction temperature, and reaction time showed increased effect on the acyl migration into the sn-2 position of PC, whereas increased water addition and substrate ratio had no significant effect in the ranges tested. The best-fitting quadratic response surface model was determined by regression and backward elimination. The coefficient of determination (R ²) was 0.84, which indicates that the fitted quadratic model has acceptable qualities in expressing acyl migration for the enzymatic transesterification. Correlation was observed between acyl donor in the sn-2 position of PC and incorporation of acyl donor into the intermediate lysophosphatidylcholine. Furthermore, acyl migration into the sn-2 position of PC was confirmed by TLC-FID, as PC with caprylic acid was observed on both positions. Under certain conditions, up to 18% incorporation could be observed in the sn-2 position during the lipase-catalyzed transesterification.     

无溶剂环氧聚氨酯涂料的研制

合成了端环氧基聚氨酯树脂和端氨基聚氨酯树脂，并利用这两种树脂制备无溶剂环氧聚氨酯涂料。讨论影响涂料性能的各种因素，采用红外光谱分析产物结构与性能的关系。     

环氧大豆油无溶剂法生产工艺述评

对无溶剂法生产环氧大豆油工艺进行了分析和比较，并对提高环氧值、降低酸值和色泽的因素进行了讨论。提高了无溶剂法环氧大豆油理想的生产工艺。