基于CO2激光热效应的喷塑涂层界面结合强度研究

用CO2脉冲激光扫描AISI304-喷塑涂层的表面,分析喷塑涂层的破坏特征和断裂行为,研究了激光热效应下喷塑涂层的结合强度.结果表明,可用吸收的激光能量定量地表征涂层和基体之间的结合强度,聚烯烃喷塑涂层-AISI304的理论结合强度为19.9 MPa,当涂层中塑料与基体的溶度参数相近时,涂层与基材的结合界面附着力较强.     

自粘防水卷材生产工艺和主要设备简介

介绍了两种自粘防水卷材的生产工艺和设备配置，并对无胎自粘橡胶沥青防水卷材的两种成型工艺作了比较。     

影响水性聚氨酯乳液涂膜性能的因素的研究

以聚醚多元醇、甲苯二异氰酸酯（TDI），二羟甲基丙酸（DMPA）等为原料制备了水性聚氨酯乳液。在DMPA用量不变的情况下，研究了NNCO/NOH值（R值）对乳液涂膜性能的影响，结果表明，R值的改变对涂膜的力学性能，吸水率，热稳定性等的产生重要的影响。     

Tack coats for asphalt paving

Poor bonding between two layers of hot mix asphalt (HMA) is the cause of many highway pavement problems. Normally, hot asphalt cements, emulsified asphalts or cutback asphalts are used as tack coat. The objective of this study was to evaluate the practice of using tack coat through controlled laboratory simple shear tests and determine the optimum application rate. The influences of tack coat types, application rates, viscosity and temperatures on the interface shear strength were examined. Test results indicated that latex modified asphalt emulsion has the highest interface bond strength. It was also found that applying low viscosity tack coat asphalt emulsion at two layers is more effective than a tack coat asphalt emulsion high viscosity one layer coat.     

Seed coat mucilages: Structural,functional/bioactive properties,and genetic information

Seed coat mucilages are mainly polysaccharides covering the outer layer of the seeds to facilitate seed hydration and germination, thereby improving seedling emergence and reducing seedling mortality. Four types of polysaccharides are found in mucilages including xylan, pectin, glucomannan, and cellulose. Recently, mucilages from flaxseed, yellow mustard seed, chia seed, and so on, have been used extensively in the areas of food, pharmaceutical, and cosmetics contributing to stability, texture, and appearance. This review, for the first time, addresses the similarities and differences in physicochemical properties, molecular structure, and functional/bioactive properties of mucilages among different sources; highlights their structure and function relationships; and systematically summarizes the related genetic information, aiming with the intent to explore the potential functions thereby extending their future industrial applications.     

高能见度纺织品的研究现状

高能见度纺织品在交通安全装饰领域的应用广泛。文章从单根纤维的回归反射、玻璃微珠的制造和排列、反光涂层三个方面介绍了高能见度纺织品的研究现状。     

无碳复写纸表面染色的影响因素

阐述涂布无碳复写纸表面染色的一些经验,分析一下影响无碳复写原纸染色及颜色的几种因素。     

稀浆封层在沥青路面预养护中的应用

阐述了稀浆封层的技术特点,并分别从材料性能要求和对原路面路况要求两方面出发,对该项沥青路面预养护技术措施进行全面、深入的研究。通过试验路的实施与监测,分析了稀浆封层技术对路面路况的改善效果,验证了在沥青路面预养护中的适用性,为该项技术的进一步推广应用提供技术支持。     

外墙外保温系统饰面层缺陷探索及工程实例分析

近年来,随着我国建筑节能的发展,外墙外保温系统得到了广泛的应用,但由于建设初期技术体系不完善,节能工程施工质量和保温材料存在质量通病,随着节能建筑大量投入使用,这些质量问题逐渐暴露出来。本文总结了外墙外保温系统饰面层常见的质量通病及其产生的主要原因。并以一幢住宅建筑为实例,通过现场目测和红外热像法等检测手段,对房屋外墙外保温系统饰面层的质量进行全面检测,查找外墙饰面缺陷的位置,并就质量问题的原因进行深入的分析,提出合理化建议.     

Antioxidant activity of polyphenolic compounds extracted from defatted raw and dry heated Tamarindus indica seed coat

The antioxidative properties and total phenolic contents of raw and dry heated seed coat of Tamarindus indica were examined. The raw and dry heated samples were extracted with methanol followed by 70% acetone, after treating with petroleum ether, solvents were removed using rotary vacuum evaporator and the extracts which contain residual moisture were freeze-dried, respectively. Methanol extracts for both raw and dry heated seed coat samples contained higher level of total phenolics and tannins than the aqueous acetone extracts. The extracts were screened for their potential antioxidant activities using such as O₂⁻, OH, α,α-diphenyl-β-picrylhydrazyl (DPPH), ABTS⁺, FRAP and linoleic acid emulsion model systems. At different concentration of respective solvent extracts, the maximum level of superoxide anion radical scavenging activity (79-85%) was observed at 200 μg of both the raw and dry heated seed coat extracts in the reaction mixture. The DPPH radical and ABTS cation radical scavenging activities were well proved with the ferric reducing antioxidant capacity of the extracts. Interestingly, among the extracts, methanol and aqueous acetone extracts of dry heated sample showed the highest hydroxyl radical scavenging activity of 56.6 and 45.7%, respectively. All extracts, exhibited good antioxidant activity (64.5-71.7%) against the linoleic acid emulsion system and the values were lower and higher than the synthetic antioxdiant, BHA and ascorbic acid, respectively.