秸秆人造板用胶黏剂研究进展

农作物秸秆人造板的使用填补了我国因木质资源短缺造成木基人造板供不应求的缺口,胶黏剂的性能则成为了制约秸秆人造板性能的关键因素。综述了秸秆人造板用脲醛树脂、酚醛树脂、异氰酸酯、三聚氰胺树脂、橡胶等胶黏剂的性能和使用现状,分析了这些胶黏剂在制作秸秆板时存在的突出问题。并且针对这些问题,介绍了无机胶黏剂、生物胶黏剂等新型胶黏剂在秸秆人造板中的应用,最后指出了传统的有机胶黏剂和新型的无机、生物胶黏剂的发展方向,为秸秆人造板用胶黏剂的进一步研究提供参考。     

浅谈利用干燥器法测定人造板中的甲醛释放量

本文根据实践操作对GB/T17657-1999《人造板及饰面人造板理化性能试验方法》进行了系统的归纳。以便检验人员操作，并分析了检测过程中容易产生的误差和应注意的事项。     

不同种类混凝土涂料的性能测试及对比研究

混凝土结构中大量使用涂料进行防腐蚀和劣化修复,准确掌握涂料的各项性能对于监控其使用效果十分重要.为了能够快速检验和测试混凝土涂料性能的优劣,根据日本土木协会和日本道路协会标准,检测了分别以氟树脂、聚氨酯和环氧为面漆的涂层配套体系的耐碱性、附着强度、耐老化能力和对裂缝的追随性.对各种涂层的性能进行了对比和分析.结果表明,各类涂层均对混凝土底材具有优异的附着能力;耐碱性能具有较大差异;氟树脂涂层具有更好的耐老化能力和更优的裂缝追随性,对混凝土结构的防护效果最佳.     

解析气候箱法测板材中甲醛释放量

正一、检测范围及标准气候箱法测甲醛适用于饰面人造板,是测板材甲醛释放量的仲裁分析方法。依据标准:GB/T17657-2013《人造板及饰面人造板理化性能试验方法》;GB18580-2001《室内装饰装修材料、人造板及其制品中甲醛释放量》。二、检测原理将1m2表面积的样品放入温度、相对湿度、空气流速和空气置换率控制在一定值的气候箱内,甲醛从     

水工环境下环氧树脂防护修复材料耐老化性能和服役寿命评价的研究进展

在水利水电工程中，环氧树脂广泛应用于水工建筑物表面防护和修复处理。然而，随着服役时间的延长，环氧树脂防护修复材料逐渐发生老化失效问题，尤其长期处于紫外、湿热等水工环境下其耐老化性能和服役寿命面临巨大挑战。综述了环氧树脂防护修复材料的耐老化性能试验方法及规范、耐老化性能评价指标和涂层寿命预测方法的研究现状，提出了未来的重点研究方向。     

木家具中甲醛释放量检测能力验证结果与分析

正0引言木家具,除了全实木家具外,多数都有人造板部件。我国有80%以上的人造板大量使用由甲醛和尿素制备而成的胶粘剂。为保证人造板的优良性能,生产时需要一定量的富余甲醛。因此,需严格控制人造板中甲醛含量,以减少人造板制得的木家具在室内使用过程中甲醛的挥发,防止危害人体健康。甲醛释放量是评价木家具质量最重要的技术指     

人造板甲醛成因及检测方法浅析

本文介绍人造板产牛甲醛的原因，分析了人造板甲醛释放量检测过程中影响测定结果的主要因素，就人造板甲醛释放量的三种检测方法（穿孔萃取法、干燥器法和气候箱法）进行了分析。     

LDHs耐紫外老化沥青的光学与老化性能研究

采用熔融共混法制备了层状双羟基复合金属氧氧化物LDHs耐老化沥青,研究了LDHs对沥青耐老化性能的影响。制备了LDHs耐老化沥青薄膜,通过沥青薄膜光学性能研究揭示了LDHs与沥青的作用机理。结果表明,LDHs可有效提高沥青的抗紫外老化性能。     

浅谈人造板甲醛释放及检测标准

本文从主要从人造板中甲醛的来源出发,分析了醛释放的原因,并讨论了检测人造板中甲醛含量的一些方法。     

超细CaCO3改性SBS材料的力学及耐老化性能研究

利用硅烷偶联剂对超细CaCO3进行改性,通过直接共混的方法制备了超细CaCO3/SBS复合材料,采用多种技术手段研究了复合材料的力学性能、加工性能及耐老化性能变化。结果表明,改性后超细CaCO3在SBS体系中能形成网状结构,材料的拉伸性能、硬度及耐老化性能提高。当超细CaCO3含量为25%时,能获得综合性能优异的超细Ca-CO3/SBS复合材料。     

人造板甲醛释放量与环境温湿度、陈放时间关系研究

通过实验研究人造板甲醛释放量与环境温度、湿度及陈放时间之间的关系。结果表明:人造板甲醛释放量随环境温度升高而明显增加,随湿度的升高而缓慢增加,随陈放时间的增加甲醛释放量逐渐降低并趋于稳定。     

Wood: A 45th anniversary review of JMS papers

The second part of a comprehensive review of the literature on wood published in the Journal of Materials Science since its inception in 1966 is presented. The topics reviewed include wood modification and surface treatment, the thermal stability of wood and resistance to fire, the physical properties of wood chars and wood-based carbon materials, and the structure-related properties of wood–cement and wood–polymer composites. The articles reflect the wide range of techniques utilised to improve wood properties, the role of wood as a precursor for carbon-based materials and cellular ceramics and the application of wood as a composite reinforcement. JMS is in the vanguard of the latest developments in all these disciplines.     

全组分木质活性炭球的制备及其乙烯吸附性能研究

目的 制备全组分木质活性炭球,应用于乙烯吸附,筛选出乙烯吸附效果最好的活性炭球制备工艺。方法 以木材液化物为原料,探究不同的固化时间对制备的全组分木质活性炭球微观形貌的影响,利用场发射扫描电子显微镜观察其微观结构,通过氮气吸附-解析等温线计算样品孔径分布及其比表面积;使用气相色谱仪,结合乙烯吸附标准曲线,分析时间及吸附剂用量对4种活性炭球吸附乙烯性能的影响。结果 随着固化时间的增加,碳球表面趋于光滑、内部结构越来越致密,石墨化程度逐渐提高,比表面积和孔容逐渐减小。当固化时间为0.5 h时,比表面积高达2 073 m²/g,乙烯吸附量高达197.99 mg/g,约3 h达到吸附平衡。结论 全组分木质活性炭球能有效吸附乙烯气体,固化时间太长,活性炭球内部孔隙减少,不利于吸附乙烯气体。活性炭球孔容越大,乙烯吸附效果越好。     

人造板中甲醛释放量的测定及不确定度评估

采用GB/T 17657-2013《人造板及饰面人造板理化性能试验方法》中的干燥器法,对卫浴家具中人造板甲醛释放量的检测过程进行试验研究,并依据JJF 1059.1-2012《测量不确定度评定与表示》分析影响甲醛释放量测定的各种不确定因素,量化和评定各不确定度分量。结果表明:甲醛释放量为(1.06±0.05)mg·L^-1,扩展不确定度的包含因子k＝2,其置信概率P=95％。经分析,由标准物质认定值和样品的重复测定引入的不确定度最大,其次为标准曲线拟合的变动性所引入的不确定度。     

木质包装材料的发展现状和前景展望

介绍了国内外木质包装材料的应用现状和研究进展,总结了木材作为包装材料应用时存在的问题,并对人造板包装材料的应用前景作了阐述.     

无醛装饰纸贴面豆胶胶合板的工艺研究

目的为了解决装饰纸贴面人造板的游离甲醛问题,探究无醛装饰纸贴面胶合板的优化工艺和贴面后涂饰水性聚氨酯的表面耐磨性能。方法采用无醛豆胶为胶黏剂制备装饰纸贴面豆胶胶合板,并在其表面涂饰无醛水性聚氨酯涂料的方法。按照相关国标,检测和分析不同工艺参数对无醛装饰纸贴面豆胶胶合板的表面胶合强度以及不同水性聚氨酯涂料涂饰量对耐磨性能的影响。结果在实验区间内,当无醛豆胶的单面施胶量为200 g/m2,热压温度为150℃,热压时间为1.5 min,热压压力为1 MPa时,无醛装饰纸贴面豆胶胶合板的表面胶合强度最高;当无醛水性聚氨酯涂料的表面涂饰量为190 g/m2时,无醛装饰纸贴面豆胶胶合板的表面耐磨性能最佳。结论采用无醛豆胶为胶黏剂制备胶合板时,无醛豆胶具有较好的渗透性能,无醛水性聚氨酯涂料具有良好的表面性能。     

The efficiencies of firewood devices (Open-fire stoves,chulahs and heaters)

Firewood is a major energy source in India. Yet no minimum fuel efficiency standards have been set for firewood devices. This paper describes methods of determining the first law efficiencies of open fires, chulahs and other wood-based heaters. About thirteen different stoves have been tested and efficiency standards for stoves have been suggested.     

Insulative Biobased Glaze from Wood Laminates Obtained by Self-Adhesion

The combination of optical transparency and mechanical strength is a highly desirable attribute of wood-based glazing materials. However, such properties are typically obtained by impregnation of the highly anisotropic wood with index-matching fossil-based polymers. In addition, the presence of hydrophilic cellulose leads to a limited water resistance. Herein, this work reports on an adhesive-free lamination that uses oxidation and densification to produce transparent all-biobased glazes. The latter are produced from multilayered structures, free of adhesives or filling polymers, simultaneously displaying high optical clarity and mechanical strength, in both dry and wet conditions. Specifically, high values of optical transmittance (≈85.4%), clarity (≈20% with low haze) at a thickness of ≈0.3 mm, and highly isotropic mechanical strength and water resistance (wet strength of ≈128.25 MPa) are obtained for insulative glazes exhibiting low thermal conductivity (0.27 W m⁻¹ K⁻¹, almost four times lower than glass). The proposed strategy results in materials that are systematically tested, with the leading effects of self-adhesion induced by oxidation rationalized by ab initio molecular dynamics simulation. Overall, this work demonstrates wood-derived materials as promising solutions for energy-efficient and sustainable glazing applications.     

Behaviour of MG-63 osteoblast-like cells on wood-based biomorphic SiC ceramics coated with bioactive glass

The aim of this study was to test the in vitro cytotoxicity of wood-based biomorphic Silicon Carbide (SiC) ceramics coated with bioactive glass, using MG-63 human osteoblast-like cells, with a view to their application in bone implantology. To better understand the scope of this study, it should be taken into account that biomorphic SiC ceramics have only recently been developed and this innovative product has important properties such as interconnected porosity, high strength and toughness, and easy shaping. In the solvent extraction test, all the extracts had almost no effect on cellular activity even at 100% concentration, and cells incubated in the bioactive glass-coated SiC ceramics extracts showed a proliferation rate similar to that of the Thermanox control. There were no significant differences when the cellular attachment response of the cells on the wood-based biomorphic SiC ceramics, uncoated or coated with bioactive glass, was compared to the one exhibited by reference materials like Ti6Al4V and bulk bioactive glass. This fact looks very promising for biomedical applications.     

大自然给予的启发——木材仿生科学刍议

本文有针对性地列举了自然界某些生物体所固有的智能行为和独特的自然属性;由自然现象给予的启发,阐述了构建木材仿生科学的理论基础;提出了依据生物学原理和现代技术,赋予木材奇异功能或创生新型复合材料的发展空间。