自交联型丙烯酸酯共聚物乳液流变性能研究

本文用旋转粘度仪测定了自交联型丙烯酸酯共聚物乳液的流变性能。讨论了功能基结构单元的种类及用量对共聚物乳液流变性能的影响。研究结果表明:含甲基丙烯酸环氧丙酯体系、丁氧基甲基丙烯酰胺体系呈胀流型流体特征,而烃甲基丙烯酰胺体系呈胀流型和假塑性流体的特征。D—τ曲线服从τ=KD~n方程。     

甲基丙烯酸缩水甘油酯

甲基丙烯酸缩水甘油酯甲基丙烯酸缩水甘油酯（又名：甲基丙烯酸环氧丙酯）英文缩写为“ＧＭＡ”，分子式为：该产品做为交联单体主要应用于粉末涂料、热固性涂料、丙烯酸树脂和乳液等产品中。由于具有独特的化学结构、适中的化学性能，在涂料制作中只需加入少量，便可改变...     

甲基丙烯酸环氧丙酯接枝ABS共聚物及其制备方法

<正>公开号:CN102516464A公开日:2015-06-27申请人:贵州省复合改性聚合物材料工程技术研究中心摘要:本发明公开了一种甲基丙烯酸环氧丙酯接枝ABS共聚物及其制备方法,它是由ABS、甲基丙烯酸环氧丙酯、ABS高胶粉、过氧化物引发剂、接枝共聚体熔融制备而成。本发明采用甲基丙烯酸环氧丙酯对ABS进行接枝改性制备ABS     

纳米SiO2改性纯丙乳液的合成及性能研究

用纳米SiO2胶体、苯乙烯、甲基丙烯酸及其酯、反应性乳化剂、交联剂、偶联剂等成功地合成了常温自交联纯丙乳液，着重介绍了纯丙乳液的合成、性能，讨论了单体加入方式、反应温度、引发剂用量、乳化剂用量、纳米SiO2胶体添加量、pH值、聚合工艺等因素对乳液合成的影响，并对其进行了表征。     

中国化学化工文献聚合物乳液题录

~~（上接封3） 环氧-丙烯酸酯乳液的研制[刊]杨瑞芹，崔天放，陈尔凡，江伟（沈阳化工学院）//化学世界. 2002，43（1）.22～25，15 以甲基丙烯酸甲酯为硬单体，丙烯酸丁酯、丙烯酸-2-乙基己酯为软单体，丙烯酸、甲基丙烯酸β-羟乙酯功能单体，环氧树脂为改性剂，通过乳液共聚合制备环氧-丙烯酸酯乳液。讨论了乳化剂配比、用量、引发剂用量，反应温度，环氧树脂用量、环氧树脂的环氧值，双及软硬单体的配比对乳液聚合反应及涂膜性能的影响，确定了适宜的反应条件及较佳的配方。 丙烯酸酯-聚氨酯改性乳液的性能研究[刊]/李延科，凌爱莲，桑…     

抗冲ACR树脂的合成及其性能评价

采用种子乳液聚合法,以丙烯酸丁酯为核层单体、甲基丙烯酸甲酯为壳层单体、甲基丙烯酸烯丙酯为交联剂制备了抗冲ACR树脂。考察了不同加料方式对ACR乳液粒径及对PVC冲击性能的影响,结果表明:连续滴加方式可实现乳液粒径的稳定控制,并能得到性能优异的抗冲ACR树脂。     

环氧-丙烯酸酯乳液的研制

以甲基丙烯酸甲酯为硬单体 ,丙烯酸丁酯、丙烯酸 - 2 -乙基己酯为软单体 ,丙烯酸、甲基丙烯酸β-羟乙酯为功能单体 ,环氧树脂为改性剂 ,通过乳液共聚合制备环氧 -丙烯酸酯乳液。讨论了乳化剂配比、用量 ,引发剂用量 ,反应温度 ,环氧树脂用量、环氧树脂的环氧值 ,以及软硬单体的配比对乳液聚合反应及涂膜性能的影响 ,确定了适宜的反应条件及较佳的配方。     

常温固化水性环氧酯防腐涂料的研究

以环氧树脂和干性油脂肪酸为主要原料，合成了常温固化环氧酯树脂，并经乳化制得乳液。考察了环氧树脂、脂肪酸、酸值、乳化工艺等对乳液性能的影响。通过选用合适有效的闪蚀抑制剂和活性颜料，解决了以该乳液制得的水性涂料的闪蚀问题。本水性环氧酯防腐涂料性能与溶剂型环氧酯防腐涂料性能相当。     

游离链段在环氧官能化ABS增韧PBT中的作用研究

采用种子乳液聚合方法,在聚丁二烯(PB)表面接枝苯乙烯(St)、丙烯腈(AN)和甲基丙烯酸环氧丙酯(GMA),合成了具有反应活性的ABS-g-GMA核-壳改性剂;通过超速离心方法将改性剂中的苯乙烯-丙烯腈-甲基丙烯酸环氧丙酯共聚物(SAN-co-GMA)游离链段分离出来,得到了ABS-g-GMA'核-壳改性剂;最后将分...     

含氟乳液的合成及其水性涂料性能第二部分——水性氟碳涂料的制备及其性能

将自制的甲基丙烯酸十二氟庚酯(FMA)-丙烯酸羟丙酯(HPA)-甲基丙烯酸月桂酯(LMA)-3-氯-2-羟基甲基丙烯酸丙酯(CHMA)四元共聚氟碳乳液(FHLC)与纳米TiO2等其他组分进行复配,制备了水性氟碳涂料,讨论了氟碳乳液和纳米TiO2的用量以及固化温度对涂层性能的影响,测定了氟碳涂层的水滴静态接触角.结果表明,当FHLC氟碳乳液用量为50g、纳米TiO2用量为20 g、固化温度为150℃时,所制备的水性氟碳涂料涂层的力学性能及耐水、耐酸、耐碱、耐沾污和耐洗刷等性能均符合国家有关标准要求,而且水接触角可达128°.     

硼酸钙对铜渣中夹杂铜沉降效果的影响

考察了添加剂CaB2O3对转炉铜渣中夹杂铜沉降效果的影响，并结合铜渣的粘度测试及红外光谱表征，研究其影响机理，采用FactSage软件计算了添加剂对铜渣液相线温度的影响。结果表明，随添加剂含量增大，铜渣中夹杂铜的沉降效果逐渐增强，添加剂含量由0增至6wt%时，底部渣含铜量由4.10wt%增至6.85wt%，这是由于添加剂可有效降低铜渣粘度。随添加剂含量增大，渣粘度降低，但降低效果随温度增大而趋于平缓。随添加剂含量增大，铜渣的硅酸盐结构趋于简化，添加剂通过破坏铜渣复杂的硅酸盐结构降低铜渣粘度。铜渣的液相线温度随添加剂含量增大而减小，添加剂通过减少渣中固体颗粒的方式降低铜渣粘度。     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Charakterisierung von Suspensionen nanoskaliger Partikel mittels Ultraschallspektroskopie und elektroakustischer Methoden

Technical control over dispersions with particles in the nanometer size realm should bring about a boost in innovations for some parts of industry. Requirements for the development of these new products is the accurate characterization of the various materials systems. A characterization should always include a determination of the particle size distribution, since it is coupled to the specific effects of these systems. Ultrasound measurement techniques and electroacoustics are two if the available techniques that allow determination of the size distribution and zeta potential of particles with dimensions up to 10 nanometers. A further fundamental advantage of the method is the possibility of carrying out measurements in high‐concentration materials systems. This report describes ultrasound spectroscopy for the measurement of fine‐ and very‐fine‐dispersion particles, and the known theoretical concepts for the interpretation of spectra. In addition, experiences in the use of currently available measurement techniques are presented.     

Trapping the western pine beetle at and near a source of synthetic attractive pheromone Effects of trap size and position

Western pine beetles were caught on unbaited sticky traps placed near a source ofexo-brevicomin, frontalin, and myrcene. Size of trap, distance and direction from the source of attractant, and height from the ground were varied. Significant differences in trap catch were observed in relation to each of the variables. Traps close to the source of attractant caught more beetles than traps farther from the source. Traps downwind of the source of attractant caught more beetles than did upwind traps. More males than females were trapped close to the source of attractant.Based in part on a thesis submitted by the senior author to the University of California, Berkeley, California, in partial fulfillment of the requirements for the degree Master of Science in entomology, December 1976. These studies were supported by the U.S. Forest Service and in part by the Rockefeller Foundation and a joint grant (NSF GB-34718/BMS 75-04223) from the U.S. National Science Foundation and the U.S. Environmental Protection Agency to the University of California. The findings, opinions, and recommendations are not necessarily those of the University of California or the funding agencies.Trade names and commercial enterprises or products are mentioned solely for information and do not constitute endorsement by the U.S. Department of Agriculture or University of California.     

Mechanical Means of Enhancing Drying Rates: Effect on Drying Kinetics and Quality

The effect of various pretreatments on drying kinetics as well as quality parameters of selected vegetables and fruits was studied experimentally in a convective dryer. The pretreatments tested include application of pinholes and drilled holes of different diameters and densities, blanching and freezing. Potato, cassava, dragon fruit and red chilli were used as the sample drying materials. As expected, increase of the diameter and density of the holes under fixed drying conditions increased the drying rate. Samples with drilled holes showed better drying performance than those with pinholes. The improvement of the drying rate was found to be dependent on the physical properties and the initial moisture content of the material. Results show that the drying performance of the products that possess a skin of low moisture diffusivity, such as chilli, can be improved significantly by blanching and making perforations in the skin. Overall changes of color and volume shrinkage during drying of the samples with and without holes were similar. The effect of different modes of heat input, such as convection, conduction and radiation, on the drying performance of the treated samples was also experimentally investigated. On-off type controllers were used to regulate the power of the heaters and maintain the product temperature within a range of pre-set values. Convection combined with radiation displayed the highest drying rate.     

氮气幕对瓦斯爆炸进行阻爆实验

为阻断瓦斯爆炸在管道方向上的传播，保护管道后方区域，本文采用氮气幕来进行阻爆，所设计的实验装置在爆炸发生后能自动喷出氮气。主要研究了氮气的喷气压力和喷气时刻对阻爆功能的影响。结果表明，在喷气压力为0.1MPa时，氮气幕仅起到抑制作用，爆炸火焰能穿过整个实验管道。在喷气压力为0.2MPa时，仅部分实验能够阻爆，氮气幕产生不稳定的阻爆效果。在喷气压力为0.3MPa时，阻爆位置均稳定在左喷头和右喷头之间区域，氮气幕产生稳定地阻爆效果。喷气压力超过0.4MPa后，阻爆位置稳定在右喷头附近。在较低氮气压力0.2MPa下，喷气时刻对阻爆效果产生显著影响。随着喷气时刻延迟，氮气喷出量减小，氮气幕由不稳定阻爆变为不阻爆。喷气时刻延迟到198ms后，氮气幕便丧失阻爆功能。在喷气压力超过0.3MPa后，氮气幕阻爆效果便不受喷气时刻的影响，喷气压力对能否阻爆起决定作用。     

水平及竖直基底上微小固着液滴的蒸发特性分析

为揭示非水平表面上微小蒸发液滴的传热传质特性,本文在准稳态模型的假设下构造三维液滴模型,综合考虑了蒸气扩散、蒸发冷却以及气相域中的自然对流这3种传输机理,对水平以及竖直基底上液滴的蒸发过程进行数值研究。通过分析气液界面上温度分布、蒸发通量分布及总蒸发率的变化,重点探究了基底过热度以及重力的改变对液滴蒸发特性的影响。结果表明：与水平基底上温度的对称分布不同,竖直基底上气液界面温度分布表现出明显的非对称性,且非对称性随基底过热度的升高而增强,最低温度点不再位于液滴顶点,而向一侧偏移。此外,水平基底上气液界面局部蒸发通量呈对称分布,各截面分布相似,而竖直基底上局部蒸发通量分布则呈现出显著的非对称性以及各截面异性,非对称性随着基底过热度的升高而增强,这是重力改变后气相域自然对流发生改变的结果。与水平基底相比,竖直基底上蒸发率更高,总蒸发时间更少。最后,基底由水平变为竖直时,液滴内部流场由对称双涡转变为非对称单涡,单涡流速显著大于双涡流速,液滴内流速随基底过热度的上升而增大,单涡环流造成了气液界面温度分布的改变以及最低温度点的偏移。     

Kinetics of base-catalyzed transesterification of triglycerides from Pongamia oil

The kinetics of transesterification of Pongamia oil using methanol at 60°C were studied. The forward as well as the reverse rate constants of all three steps involved in the transesterification of Pongamia oil are reported for the first time. Among the forward rate constants, the one governing the conversion of TG to DG was the highest and the one for DG to MG was the lowest. A distinct feature of the present work is the direct estimation of the equilibrium constants of all three steps by measuring the concentrations of TG, DG, and MG at very long reaction times. This reduced the number of parameters to be, determined from the kinetic data by one-half, thereby leading to more accurate estimation of the rate constants. The equilibrium constant of the final step involving the conversion of MG to methyl ester and glycerol was at least an order of magnitude greater than that of the first two reaction steps. A detailed comparison was made with kinetic parameters reported in literature. The trend in the relative magnitudes of the rate constants appears to be unique to Pongamia oil.     

Breakage patterns of agglomerates

The experimental information available in the literature regarding the patterns of breakage of agglomerate materials is scarce, particularly in dynamic loading. The primary objective of this paper is to present our findings on the breakage patterns of the agglomerates and the interparticle bond. A high-speed digital video imaging technique is used here to gain an insight into the impact behaviour of individual agglomerates against a target plate. Several breakage patterns are observed. Agglomerates may suffer localised damage only, with the disintegration of the damaged zone into very fine debris, or localised damage combined with fracture. The frequency of occurrence of these patterns depends on the impact velocity and agglomerate structure. The pattern of breakage affects significantly the size distribution of the impact product. An investigation of the breakage of individual interparticle bonds is also presented. Two forms of failure are observed, internal (cohesive) and interfacial (adhesive) failure. The morphology of the fractured surface depends greatly on the type of breakage. Internal breakage shows irregular surfaces due to crack jumping, whereas interfacial failure produces clean, smooth fracture surfaces. These observations should provide the necessary foundation for the development of a fundamental model of agglomerate breakage.     

Functional properties of proteins in foods

The measurement of functionality of protein food ingredients has developed somewhat haphazardly, probably due to the wide range of proteins used as ingredients and the diversity of foods. Studies of the physiochemical properties of proteins should enable prediction of a proteins response to process environments and prove more fruitful than many of the empirical measurements of functionality. The effects of pH, salt type and concentration on the phase behaviour of the oilseed globulin and arachin, demonstrates the complexity of protein solubility and the inadequacies of simple tests that have arisen. Studies of the effects of salts and conditioning on meat fibres, coupled with measurement of the location of water in pellets from water holding tests enable the latter to be applied with increased confidence. Comparison of the endothermic transitions observed on heating with the development of storage and loss moduli allow the contributions of domains of skeletal muscle myosin to gel structure to be investigated.