排序方式: 共有96条查询结果,搜索用时 15 毫秒
1.
2.
To date, a limited number of aqueous conditions have been tested experimentally as potential cleaning reagents on modern acrylic paint films. Those assessed have tended to extract measurable quantities of paint film components and distort the paint films physically. In this paper the results of a series of experiments designed to examine pH, conductivity, and specific ion effects of potential aqueous cleaning solutions on a series of commercial acrylic paints are reported. A three-dimensional microscopic technique was used to characterize the physical (volume and surface roughness) changes and liquid chromatography-tandem mass spectrometry was used to characterize the chemical (extracted surfactant) changes following paint film exposure to the aqueous solution. The tested paint films in this study clearly exhibit an isotonic point below which swelling and extraction is significant, and above which the swelling and extraction is diminished. Manipulation of conductivity and the ionic species in solution can reduce both the physical film changes and surfactant extraction from acrylic paint films; while pH appears to be of limited use in controlling aqueous cleaning effects. Moreover, there seems to be a specific ion effect for both swelling and de-swelling in acrylic paint films that can be rationalized through the Hofmeister Series. 相似文献
3.
4.
针对密集多通道无机陶瓷膜处理汽车发动机乳化液废水开展了中试试验,并通过工程检验,获知该类废水处理的适宜设计参数为:膜面流速取4-6 m/s,压力控制为0.3 MPa,温度控制在45℃左右;在相应的操作条件下,COD、含油量等均达到了后续污水处理的水质要求,效果明显。 相似文献
5.
Philip Barnett 《The Reference Librarian》2014,55(2):118-127
This article addresses what reference librarians should do when patrons ask for information about explosives or dangerous drugs, and explores how reference librarians can possibly deter people from dangerous, unmediated searches by proactively providing information and actual examples on the dangers and risks of making and using these materials. 相似文献
6.
7.
陈家越 《宁德师专学报(自然科学版)》2005,17(1):11-14
介绍在丙烯酸酯乳液共聚反应中,在乳化剂总用量一定的条件下,改变阴离子型和非离子型乳化剂的配比关系以及改变非离子型乳化剂的种类,制得一系列Tg=-10的弹性乳液和Tg=27℃度乳液.用这两种乳液做与水泥配伍实验和用这种乳液与一定浓度(20%或饱和钙离子溶液)相混合,检测乳液与它们相互混合的性能. 相似文献
8.
采用核壳聚合法制备了以聚丙烯酸丁酯为核,以聚苯乙烯和聚甲基丙烯酸甲酯为壳的软核硬壳型乳液,考察了不同的软硬单体配比、乳化剂浓度、引发剂浓度、反应温度等因素对乳液性能的影响,并探究了交联剂对乳液性能影响。通过单因素分析,确定各因素最佳组成,软硬单体比例为BA/St/MMA=15:6:4,甲基丙烯酸占单体总质量的5%,乳化剂占单体总质量的3%,阴离子型/非离子型乳化剂的比例为1:1,引发剂占单体总质量的0.5%,交联剂N-羟甲基丙烯酰胺占单体总质量的0.6%。 相似文献
9.
文章从工艺控制角度,分析了影响乳化炸药连续生产线产品质量的因素,讨论了生产前的原材料选择和检测、水相油相制备、连续乳化冷却敏化、装药包装等过程中的质量控制,对稳定和提高乳化炸药产品质量具有十分重要的意义和作用。 相似文献
10.