功能型FEVE氟碳树脂涂料

简单介绍功能型FEVE氟碳树脂涂料,诸如烘烤型氟碳涂料、弹性氟碳涂料、高硬度氟碳涂料、防涂鸦氟碳涂料和塑料用氟碳涂料的概况,以适应市场多元化和差异化要求。     

氟碳涂料的最新研究进展

介绍了氟碳涂料的最新研究进展,包括含氟硅烷脲醛微胶囊多刺激触发疏水自修复氟碳涂料、常温固化高固体分FPVE氟碳涂料、Bi_2WO_6/TiO_2复合材料改性的高效环保杀菌PEVE涂料、g-C_3N_4/Ag_2WO_4氟碳抗菌涂料、太阳能背板粘结层用氟碳涂料、NFTO/FEVE无机-有机杂化涂料、不锈钢用耐低温透明氟碳涂料、耐沾污自清洁氟碳弹性涂料、混凝土防腐水性氟碳涂料和丙烯酸改性氟碳粉末涂料等。     

2011(第12届)氟硅涂料行业年会将于9月在济南召开

经过十多年的发展,氟碳涂料在中国已进入稳步发展阶段,同时随着环保要求日益严格,弱溶型氟碳涂料、高固分氟碳涂料、水性氟碳涂料及粉末氟碳涂料将成为人们关注的焦点。为此2011氟硅涂料行业年会的筹备工作将围绕确保氟硅涂料品质,合     

2011(第12届)氟硅涂料行业年会邀您共聚

经过十多年的发展,氟碳涂料在中国已进入稳步发展阶段,同时随着环保要求日益严格,弱溶型氟碳涂料、高固分氟碳涂料、水性氟碳涂料及粉末氟碳涂料将成为人们关注的焦点。为此2011氟硅涂料行业年会的筹备工作将围绕"确保氟硅涂料品质,合     

2010氟硅涂料行业年会即将召开

<正>中国化工学会氟涂料专委会组织召开的氟硅涂料年会今年已进入第11个年头,这标志着氟碳涂料技术已进入成熟期。氟碳涂料性能优异,使用寿命长,维护成本低,符合当今"低碳经济"的核心思想。水性氟碳涂料、粉末氟碳涂料等环保型氟碳涂料以及各种功能型,如耐磨、耐高温氟碳涂料的应用必将推开新的局面。据相关部门预测,到2020年我     

非异氰酸酯氟碳涂料的研究进展

综述了氟碳涂料的发展过程、结构、分类及性能。传统氟碳涂料是由有机多异氰酸酯与氟碳树脂反应形成的含有氨基甲酸酯链段的高分子化合物,但是传统氟碳涂料固化方法用多异氰酸酯对人体健康和环境造成严重的危害。非异氰酸酯氟碳涂料的开发解决了以上这些问题。概述了非异氰酸酯氟碳涂料制备方法。重点阐述了氟碳涂料在纳米材料方面的改性处理。同时对非异氰酸酯氟碳涂料的应用及发展做了展望。     

氟碳涂料在外墙的应用探究

从氟碳涂料多年来在外墙领域的应用发展情况,总结了氟碳涂料在外墙使用中产生的各种问题,分析了问题产生的原因。提出了更好应用氟碳涂料的建议和意见,让氟碳涂料在外墙上可以更加合理地使用,发挥出氟碳涂料最大的应用优势。     

2015氟碳涂料行业发展状况

阐述了氟碳涂料行业发展概况,各类氟碳树脂涂料2015年的销量、主要生产单位及市场分布。同时介绍了粉末氟碳涂料和水性氟碳涂料的发展现状。     

第4届氟碳涂料培训班圆满结束

经过近2年的发展,氟碳涂料在建筑、桥梁等领域的应用已初具规模,同时在其他领域的应用及水性氟碳涂料、粉末氟碳涂料、耐沾污氟碳涂料等的研究与应用也倍受关注。在市场与技术的双重推动下,第4届氟碳涂料培训班如期于3月21-25日在上海开班,来自全国氟树脂涂料及相关     

氟碳涂料国内外现状及发展趋势

综述了国内外氟碳涂料的研究和应用现状,重点介绍了水性氟碳涂料、高固体分涂料、粉末涂料、防粘耐磨氟涂料、防反射膜用氟树脂涂料等几种高性能、环保型的新型氟碳涂料。     

Failure of tannic acid to inhibit digestion or reduce digestibility of plant protein in gut fluids of insect herbivores

The rate of hydrolysis of the abundant foliar protein, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPC), in enzymatically active gut fluid ofManduca sexta larvae is very rapid and is unaffected by the presence of tannic acid, even when tannic acid is present in the incubation mixture in amounts in excess of the amount of RuBPC. When this protein is dissolved in the denatured gut fluids ofM. sexta larvae orSchistocerca gregaria nymphs, large amounts of tannic acid must be added to bring about the precipitation of significant quantities of protein. The ability of insect gut fluid to prevent the formation of insoluble tannin-protein complexes is due to the presence of surfactants. On the basis of our results and a review of the findings of other investigators, we argue that there is no evidence that tannins reduce the nutritional value of an insect's food by inhibiting digestive enzymes or by reducing the digestibility of ingested proteins and, further, that the failure of tannins to interfere with digestion is readily explained on the basis of well-documented characteristics of the digestive systems of herbivorous insects. In challenging the currently popular notion that tannins are digestibility-reducing substances, we do not challenge the general utility of either the apparency theory or resource availability theory of plant defense. In debating the merits of these two analyses of plant-herbivore interactions, however, the demise of tannins as all-purpose, dose-dependent, digestibility-reducing defensive substances must be taken into account.     

机制砂岩性与级配对混凝土抗硫酸盐侵蚀性能的影响

为了探究不同岩性、不同级配机制砂对混凝土性能的影响,对三种不同岩性机制砂混凝土及天然河砂混凝土的工作性和抗压强度进行研究。此外,对比分析了四种混凝土在干湿循环制度下的抗硫酸盐侵蚀性能。结果表明,天然河砂混凝土的工作性优于机制砂混凝土,钙质机制砂混凝土的工作性略好于硅质机制砂混凝土。机制砂混凝土的抗压强度优于天然河砂混凝土,在硫酸盐侵蚀循环作用下的力学性能变化趋势与天然河砂混凝土基本一致。在相同级配条件下,机制砂混凝土的抗蚀系数高于天然河砂混凝土;机制砂岩性并不会对混凝土抗硫酸盐侵蚀性能带来负面影响。级配良好的机制砂可以增强混凝土抗压强度和抗硫酸盐侵蚀性能。     

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.     

Aggregation pheromone system of adult gregarious desert locust schistocerca gregaria (forskal)

Six electrophysiologically active aromatic compounds, viz., anisole, benzaldehyde, veratrole, guaiacol, phenylacetonitrile, and phenol, were identified in the volatiles of older-adult male desert locust. Young adults and females of all age groups produced none or only trace quantities of these compounds. Comparison of the aggregation responses of young and older adults to the crude, older-adult, volatile extract and different synthetic blends of the six compounds showed that the aggregation pheromone system of the adult gregarious locust consists of phenylacetonitrile, guaiacol, phenol, and benzaldehyde. Like the crude volatile extract of older males, neither the synthetic blend of the six compounds nor the adult pheromone blend evoked any significant aggregation responses from nymphs. These results confirm our previous report of sexual differentiation in the production of adult aggregation pheromone in the desert locust and of the evidence of two distinct aggregation pheromone systems in the two stages of the insect.     

Molecular mechanics modelling of interfacial energy and flexibility on cellulose

Molecular mechanics modelling is used to calculate the energies of interaction, hence the molecular level energy of adhesion at the interface with crystalline cellulose I of three different photopolymerizable primers and of a polyester varnish at the interface with the primer/cellulose assembly. The energy of interactions for just one of the primers with the statistically most common conformation of amorphous cellulose has also been obtained for comparison. Experimental results of adhesion by a standard peel test and by thermomechanical analysis, in which the effect of viscoelastic energy dissipation by crack tip propagation has been respectively minimized or is not present, hence in which the energy of interfacial interaction is nothing else but the work of adhesion, correlated well with the energies of interaction calculated by molecular mechanics. An equation correlating the energy of interaction at each finish/cellulose interface with the deflection derived by thermomechanical analysis, and with the number of internal bond rotational degrees of freedom as well as the degree of networking of the finish, has been derived and is presented. A relationship between the intrinsic fracture energy Go and the molecular mechanics-derived energy of interaction at the interface equating this to the square of the work of adhesion is obtained and is presented.     

Distribution of birch (Betula SPP.), willow (Salix SPP.), and poplar (Populus SPP.) secondary metabolites and their potential role as chemical defense against herbivores

Isoprenoids and phenolics, major metabolites of important browse species, are reviewed in regard to concentrations, distribution within tissues, and between species. Seasonal variation of specific substances and changes with age of the plant are also considered. The distribution of substances may affect food selection and feeding behavior of animals. Wild mammalian herbivores tend to avoid plant parts rich in these substances, in spite of high nutritional content of the plant tissue. Possible mechanisms for defense by plants against depredation by mammalian herbivores are discussed within the framework of the plants' biochemistry.     

Sr改性Cu催化剂的果糖加氢制备甘露醇性能

使用共沉淀法制备负载Cu催化剂。通过添加碱土金属Sr，对Cu催化剂进行了改性，以提高Cu催化剂在果糖加氢制备甘露醇过程中的活性和选择性。采用ICP-MS、TEM、XRD、H₂-TPR、XPS和CO₂-TPD等对所制备的催化剂进行了系统表征。结果表明：Sr的添加能增大催化剂的比表面积，促进活性组分Cu的分散，从而提高了催化剂的活性，并且增加了催化剂的碱性，使果糖优先形成β-呋喃糖中间体，从而提高了甘露醇的选择性。在果糖浓度为1.1 mol·L^-1、催化剂用量为反应物质量的6%、反应温度为373 K、反应氢压为4.0 MPa、Cu/Sr原子比为7∶1的反应条件下，果糖转化率为99%，甘露醇的选择性为79%。催化剂循环使用了20次，其催化稳定性基本保持不变。     

接触式机械密封界面泄漏机理研究的关键科学问题

密封界面的泄漏机理是机械密封研究与应用的焦点问题之一,涉及泄漏通道表征、粗糙表面的接触力学模型、界面微观形貌变化以及介质流体在泄漏通道中的流动阻力等问题。回顾了近几十年国内外接触式机械密封泄漏通道模型的研究,深入分析了G-W模型、M-B模型和Persson模型3种粗糙表面接触力学模型的贡献和存在的问题,提出了一种基于逾渗理论的泄漏通道新模型;探讨了密封界面的分形参数、泄漏通道的流动阻力以及密封界面的有限尺寸效应对泄漏特性的影响,指出孔隙连通贯穿界面和流体流经贯穿通道的流动阻力小是密封界面产生泄漏的成因,以及泄漏通道的形成和泄漏通道内的流体流动特性是泄漏机理研究的主要方向。     

Measured kinetics of the acid-catalysed hydrolysis of sugar cane bagasse to produce xylose

Experimental trials of the water hydrolysis of bagasse to produce xylose, arabinose and glucose were conducted using a temperature-controlled microwave digester. The experimental variables were temperature, ratio of water mass to bagasse mass, type of bagasse material and reaction time. The pH of the liquid and concentration of dissolved xylose, arabinose and glucose were measured at the completion of each trial. Kinetic modelling of the global rates of formation of monosaccharide products was performed using schemes based on earlier researchers’ models of acid hydrolysis using mineral acids. For the most plentiful product, xylose, the most accurate kinetic model of the global reactions was determined to be two parallel pathways for hydrolysis of xylan to xylose followed by a single pathway for xylose decomposition. The calculated activation energies of the reactions were within the range reported by other researchers for the hydrolysis of a range of lignocellulosic materials using mineral acids.