人造板家具中甲醛释放量检测方法探讨

随着近些年科学技术的发展,室内使用人造板类装饰装修材料数量明显增加,因此使用人造板制作的家具受到了广大消费者的喜爱,有着非常好的市场销售情况。然而,人造板家具在当今世界的广泛使用也导致了另一重大的环境问题--室内污染。大量的人造板家具在室内使用,产生的甲醛释放源大幅度增加,造成室内空气污染。而人造板家具则是引起室内甲醛浓度超标的重要释放源,从而使得人造板家具的甲醛释放量越来越受到人们的关注。本文系统化的分析了影响人造板家具中的甲醛释放量检测结果的各项因素,并对甲醛的收集、甲醛含量的定量操作这两个关键操作步骤进行了详细阐述,从而对人造板的甲醛释放量的检测方法有更深入的了解。     

干燥器法测定人造板甲醛释放量的不确定度评价

根据GB/T 17657-2013《人造板及饰面人造板理化性能试验方法》中干燥器法测定甲醛释放量,对人造板中甲醛释放量进行测定,并根据JJF 1059-2012《测量不确定的评定与表示》提出了干燥器法测定甲醛释放量的不确定度的评定方法,对甲醛释放量的不确定度进行分析和评价,确定了干燥器法测定人造板中甲醛释放量的测定结果的不确定度。     

室内装修中人造板的甲醛释放规律研究

本文对室内装饰用的人造板的甲醚释放规律进行研究。试验结果表明,人造板甲醛释放量随温度升高而增加;随含水率增加而增大：随人造板放置时间增长,而逐渐降低。人造板封边与否,则明显影响甲醛释放量。本论文的研究可以为室内甲醛污染的治理提供依据。     

干燥器法测定甲醛释放量的不确定度评定

依据GB/T 17657-1999《人造板及饰面人造板理化性能试验方法》中干燥器法测定甲醛释放量,对装饰单板贴面人造板中甲醛释放量的检测过程进行研究,分析了检测过程的不确定度来源,确定了人造板甲醛释放量的测量结果不确定度,提出了干燥器法甲醛释放量检测不确定度的评定方法。     

人造板家具甲醛释放量检测干燥器法研究与分析

实验通过干燥器法对不同使用功能的人造板类家具的甲醛释放情况进行了检测,以确定不同种类人造板类家具甲醛释放量之间的关系。干燥器实验结果显示,当人造板家具生产所使用板材相同的情况下,干燥器法检测的数值基本上相同,从而得出结论,干燥器法不能反映不同种类家具甲醛释放状况。同时,实验结果还说明了GB18584-2001《室内装饰装修材料木家具中有害物质限量》还存在很多需要进一步完善和改进的地方。     

人造板甲醛释放量检测方法探究

因甲醛的危害程度较大,因此针对人造板中甲醛的释放量的检测方法越来越受到社会各界关注。对人造板甲醛释放量的几种国内外常见的检测方法进行研究,如干燥器法、气候箱法、穿孔萃取法,提高检测效率和检测准确性。     

减少人造板甲醛释放量的方法

介绍了人造板释放甲醛的来源以及甲醛对人体的危害 ,同时介绍了减少人造板甲醛释放量的有效措施     

减少人造板甲醛释放量的方法

介绍了人造板释放甲醛的来源以及甲醛对人体的危害，同时介绍了减少人造板甲醛释放量的有效措施。     

建筑装修材料人造板甲醛释放量研究

实验通过气候箱对不同厂家生产的人造板甲醛释放情况进行了检测,以研究气候箱内甲醛浓度随时间的变化规律。实验结果显示,不同厂家生产的人造板甲醛释放量差异较大。随时间推移,气候箱内甲醛浓度在不断减小,当达到某一时间后,甲醛浓度变化较小,基本保持稳定,此时认为甲醛释放量达到稳定。     

生物质甲醛捕捉剂的应用与进展

甲醛捕捉剂是人造板生产和应用中的一种重要助剂,使用甲醛捕提剂可以有效降低游离甲醛释放而提高人造板品质。本文详细介绍了国内外以树皮、茶叶、蛋白质、某些中药材、天然樟科植物提取物等物质为主剂,制备的生物质基甲醛捕捉剂的研究、应用状况,概述了生物质甲醛捕捉剂的主要活性成分以及甲醛捕捉机制。     

乙苯,苯乙烯的生产及合成乙苯,苯乙烯催化剂的研究进展

苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况，合成乙苯，苯乙烯所用的催化剂种类，并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。     

Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile

Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, ¹³C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc.     

生物质气化及生物质与煤共气化技术的研发与应用

总结了生物质原料的特点及生物质单独气化的缺点;介绍了国内外生物质气化技术及生物质与煤共气化技术的研发与应用现状;分析了在此领域国内外的发展趋势与前景;概括了开展生物质与煤共气化技术研发的意义。     

Electronic structures and reactivities of monometallic and bimetallic clusters of Au and Cu

The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu₃Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu₃Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters.     

钾盐资源及钾肥供需情况分析及预测

阐述了国内外钾盐资源及钾肥生产现状,对国内外钾盐的供需形势进行了分析及预测,从资源、原材料、国际市场三方面提出了解决我国钾盐短缺的措施。     

Kinetics and Mechanism of Oxidation of Mono- and Polyacetals

Abstract

Kinetics and mechanisms of oxidation of 6 acetals by molecular oxygen and ozone in liquid phase have been studied. Reaction with molecular oxygen (70°C, 15–16 hr) leads to the formation monoethers of the corresponding glycols with 68–90% selectivity. Salts of metals and complexes with crown-ethers have increased the reaction rate significally. Ozone have reacted with acetals with formation similar products. The mechanisms of intermediate stages have been proposed.     

Comparison of the Adhesion and Cohesion of Triblock and Random Copolymers of Styrene and Butadiene

A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength.     

责任和责任心的涵义与结构

责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体.     

二甲基二烯丙基氯化铵和丙烯酰胺的合成及应用

用复合引发体系(过硫酸盐-偶氮类引发剂)和脂肪胺类氧化还原体系引发,在实验室获得了单体转化率≥98%,特性粘数高于13.6 dL/g的阳离子共聚物PDA,探讨了控制聚合物分子量的影响因素.     

Wetting properties of homopolymers and copolymers of pentafluorostyrene and methylacrylate and homopolymer blends

Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method¹ was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity.