不同引发剂下醋酸乙烯酯共聚乳液的合成及性能研究

采用双氧水(H2O2)、亚硫酸氢钠(NaHSO3)和双氧水-亚硫酸氢钠(H2O2-NaHSO3)三种不同引发剂引发醋酸乙烯酯和丙烯酸单体乳液共聚,制得了一种改性聚醋酸乙烯酯乳液,研究了引发剂用量对乳液的固含量、粘度和耐水性等性能的影响,并且对三种引发剂的引发性能进行了对比.结果表明,改性后的聚醋酸乙烯酯乳液的外观光滑细腻并且其耐水性,稳定性都有所提高,且使用质量比为1:3的双氧水-亚硫酸氢钠复合引发剂时,聚合物乳液的综合性能最佳.     

棉织物防皱整理上的动力学反应实验分析

用增重法研究了氨三乙酸钠（SAT）作为无磷催化剂,BTCA与棉纤维之间的反应动力学。通过测定三个不同焙烘温度下BTCA与棉纤维之间的反应速率常数,反应活化能,证明了BTCA/SAT系统在棉纤维上的反应规律与BTC/SHPA系统在棉纤维上的反应规律类似,符合假一级反应。而且系统的活化能顺序如下BTCA/SAT〈BTCA〈SHP.     

Effects of vibration technology and polyvinyl acetate emulsion on microstructure and properties of expanded polystyrene lightweight concrete

To prevent expanded polystyrene (EPS) beads from rising up to the surface in the molding process of EPS lightweight concrete, vibration with pressure was applied and the polyvinyl acetate (PVA) emulsion was adopted to im-prove its mechanical properties. The mechanical properties, thermal properties and durability of EPS lightweight concrete were tested. The microstructures of EPS lightweight concrete were observed by scanning electron microscope (SEM). Vibration with pressure reduces the number of small cracks. The 180 d compressive strength and flexural strength increase obviously as a large amount of PVA was added. The mixed amount of PVA has no obvious influence on the thermal per-formance when it is not more than 10% of the cement. Vibration with pressure and surface modification of EPS beads by PVA improve the combination of EPS beads with cement stone and the mechanical properties of EPS lightweight con-crete.     

卤片碳铵法制备轻质氧化镁

本文介绍了卤片和碳酸氢铵制备轻质氧化镁的工艺过程,考察了沉淀剂加入量、反应时间、反应温度及洗涤水温度对制备的影响.结果表明,沉淀剂用量为1.4倍理论量、反应时间为1.5h、反应温度为75℃、洗涤水温度为95℃时制备的轻质氧化镁转化率高、产品质量可达到分析纯轻质氧化镁.     

季铵盐-镧-蒙脱土复合材料的制备及性能研究

以龙岩膨润土为原料,氟化钠为改性剂制备钠基蒙脱土.采用水热离子交换法,将镧离子和十六烷基三甲基季铵阳离子交换到蒙脱土的层间得到改性蒙脱土,并对其结构和抗菌性能进行了表征.X-射线衍射法(XRD)分析发现,改性蒙脱土的层间距发生了变化;红外光谱测试(FT-IR)结果显示出相应的离子吸收峰,说明镧离子和十六烷基三甲基季铵阳离子确实交换到蒙脱土层中.抗菌实验结果表明,CTAB-La-MMT具有较好的抗菌性能,对金黄色葡萄球菌(Staphyloccus.aureus)和大肠杆菌(Escherichia.coli)的最小抑菌浓度(MICs)分别小于200mg/L和400 mg/L,其抗菌效果比Na-MMT、La-MMT和CTAB-MMT改性蒙脱土都好.     

咪唑啉季铵盐的合成及对A3钢在盐酸溶液中的缓蚀性能和吸附行为研究

以二甲苯为溶剂,苯乙酸和二乙烯三胺为原料,经酰胺化和环化脱水合成了新型咪唑啉化合物,并用氯乙酸钠溶液对其进行改性得到了苯乙酸咪唑啉季铵盐(PAIPI).通过失重法、电化学方法研究了其在1 mol/LHCl中对A3钢的缓蚀性能,并用电化学方法研究了PAIPI在1 mol/LHCl中在A3钢表面的吸附行为.结果表明,PAIPI在1 mol/L HCl中对A3钢均为阳极型缓蚀剂;PAIPI在1 mol/L HCl中在A3钢表面是单层吸附,属物理吸附.     

石英砂尾矿在涂料中的应用研究

文章结合我国某些地区石英砂产量大,石英砂尾矿多而利用率低的现状,对石英砂尾矿在涂料中的应用进行研究,以提高石英砂尾矿的附加值和资源的利用率,同时减少环境污染。     

中和料浆浓缩法制磷铵工艺

主要介绍中和料浆浓缩法制磷铵工艺原理,技术发展现状,并进行了展望。     

Original and reformulated BEVA® 371: Composition and assessment as a consolidant for painted surfaces

Abstract

Many natural and synthetic products have been used for the consolidation of paint layers, but none have been thoroughly tested for this application. This is apparent for most of the synthetic and semi-synthetic adhesives for conservation, many of which are pure polymer resins and dispersions adapted from other industries. They were not specifically formulated with the appropriate properties for conservation, nor do they take advantage of some of the more recent developments in adhesive technology. BEVA^® 371 is unique among adhesives used for consolidation treatments, as it is a multi-component mixture and was designed specifically for the conservation field using the best technology available at the time. However, the main focus of the research was its application as a lining adhesive. Thus, optical properties and stability, specifically color stability, were not thoroughly evaluated even though some lining applications that were first recommended could have benefited from this type of investigation. This paper will discuss the development of BEVA^® 371, the chemistry, and roles of each component, and address a practical concern about the tack behavior of its replacement formulation, BEVA^® 371b.     

阴离子表面活性剂在碳铵添加剂中的应用研究

综述了反应型阴离子碳铵添加剂的生产应用现状,并从分子结构和产品组成上分析了使用效果差异;同时,指出了开发新产品的研究方向。