ABS复合材料的阻燃及静态力学性能研究

以PVC,CPE,纳米Mg（OH）2和纳米ZnSnO3为阻燃剂对ABS进行改性,结果表明,ABS复合体系的最佳配方为：m（ABS）：m（PVC）：m（CPE）：m（纳米Mg（OH）2）：m（纳米ZnSnO3）=100：60：11：3．5：2．此时,体系的拉伸强度为36．39MPa,缺口冲击强度为34．80kJ／m^2,氧指数为31．5％,水平燃烧达到Ⅰ级,垂直燃烧达到FV-0级,而且燃烧过程中几乎没有黑烟产生,复合体系综合性能较佳．     

ABS复合材料动态力学性能研究

采用动态机械热分析法对配方为m（ABS）∶m（PVC）∶m（CPE）∶m（纳米Mg（OH）2）∶m（纳米ZnSnO3）=100∶60∶11∶3.5∶2的ABS复合材料的动态力学性能进行测试.结果显示：复合材料的储存模量高于纯ABS材料,而损耗模量和损耗因子远低于纯ABS材料.这表明,在交变应力作用下,与纯ABS相比,复合材料具有更好的冲击强度和柔韧性.此项研究可为ABS复合材料的实际应用提供理论依据.     

羟基锡酸锌/Sb_2O_3对聚氯乙稀复合建筑膜材的协同阻燃性能

为提高聚氯乙烯(PVC)复合膜材的阻燃性能并降低Sb2O3的使用量,制备了羟基锡酸锌(ZHS);利用X射线粉末衍射仪、傅里叶红外光谱仪和场发射扫描电镜对制备的样品进行了测试。结果显示,制备的样品为边长1μm左右的立方体ZHS。将ZHS等助剂添加到PVC糊料中制备了具有阻燃作用的膜材涂层材料,通过测试极限氧指数、热重分析及扫描电镜对炭渣形貌分析等方法,探讨了PVC复合涂层材料的阻燃作用。结果表明:添加ZHS的PVC材料的残炭量高于添加Sb2O3的PVC材料且炭渣表面更致密;而添加ZHS/Sb2O3的PVC材料的极限氧指数(LOI值)高于二者单独使用,即ZHS和Sb2O3对PVC涂料存在协同阻燃效应,从而降低Sb2O3在阻燃PVC涂层材料中的使用量。     

PVC／ABS合金纬纱管应用开发

本文论述了开发PVC/ABS合金纬纱管的意义,综述了国内外PVC/ABS合金的发展情况,分析了PVC/ABS合金的生产路线,指出了国内PVC/ABS合金纬管应用开发中存在的问题.     

塑料经纬纱管原料发展浅析

塑料纱管日益增多。经纱管原料有聚氯乙烯、ABS、PVC/ABS共混改性、聚氯乙烯+经处理的填料、ACR改性PVC等。纬纱管原料有ABS、PVC/ABS改性、PC/PE改性、改性聚苯醚等。本文介绍了各种原料的使用,性能及其发展。     

用ACR改性PVC的塑料经管料的生产

一、前言利用ABS改性PVC做塑料经管,从配方到工艺,可以说已经成熟。但是,由于ABS的塑化温度较PVC高,在PVC中添加ABS,势必增加它的塑化温度;掺入量愈多,改性料的成型温度愈接近PVC的分解温度,从而恶化操作条件,影响产品质量。另一方面,ABS改性的经管外表粗糙;而且,从共混改性操作上看,由于ABS一般都是以粒状掺入,既麻烦又不均匀。由此看来,ABS改性料还是不太令人满意。     

国外新上市玩具

万代高达Z动画系列中机体MK-II的胸像。材料为PVC和ABS,共有两种颜色供选择。当地售价2,940日元(折合人民币约206元)机动战士高达MK-II胸像     

壳聚糖接枝苯丙共聚物乳液的制备和表征

在H2O2-FeSO4双组分氧化还原体系中,以壳聚糖为主链,以苯乙烯(St)、丙烯酸丁酯(BA)、N-羟甲基丙烯酰胺(HMAM)和二甲基二烯丙基氯化铵(DMDAAC)为主要单体,通过无皂乳液聚合制备了壳聚糖接枝苯丙共聚物乳液,并将其用作文化用纸的表面施胶剂,通过红外光谱(FT-IR)、静态接触角和扫描电子显微镜(SEM)对壳聚糖接枝苯丙共聚物乳液进行了结构和性能表征。结果表明,壳聚糖接枝苯丙共聚物乳液较佳的合成条件为:m(单体)/m(壳聚糖)=25,m(过硫酸钾)/m(壳聚糖)=3,m(FeSO4)/m(H2O2)=0.03,HMAM用量6%(对乳液质量),m(St)/m(BA)=2.5;壳聚糖接枝苯丙共聚物乳液可提高文化用纸的施胶度、印刷表面强度、耐破度和抗张强度。     

硬质聚氯乙烯塑料在纺织筒管上的应用

本文论述了20多年来在我国的纺织器材行业中塑料纺织筒管的发展情况。筒管所采用的塑料有聚氯乙烯、ABS、聚丙烯和高密度聚乙烯改性聚碳酸酯(HDPE/PC)等。还介绍了聚氯乙烯的全国产量、生产方法及其特点;聚苯乙烯(PS)、玻纤增强PS、丁苯改性PS等材料试制筒管情况;PVC所用的稳定剂、增塑剂、ABS共混和ACR加工改性剂。最后谈到用挤出的RPVC结构泡沫塑料管代替普通PVC挤出管。     

PVC／ABS合金纬管的配方设计及生产工艺

以国产丰富的PVC树脂为主,加入适量的ABS、增混剂和其它添加剂,可以制得价格较低,综合性能优良的PVC/ABS合金纺织纬管。本文采用流变试验等手段,对原料选型、配比,合金体系的稳定化和均质化,以及改善加工性能等配方设计五要素,进行了初步探讨。并根据实际生产给出了可供参考的工艺配方、挤出造粒和注射成型的控制参数。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press