皮革用丙烯酸涂饰剂的研究

本文着重研究了加料方式、乳化剂用量、以及交联剂用量等因素对乳液性能的影响.研究结果表明:采用单体预乳化和单体直接滴加两种不同加料方式制备的乳液共混可以得到性能优异的涂饰剂;乳化剂和交联剂的用量分别为1%～4%和2.0%～4.0%时,聚合过程稳定,乳液耐水性好.     

改性丙烯酸树脂皮革涂饰剂的合成及应用

研究了加料方式、乳化剂用量以及交联剂种类和用量等因素对乳液性能的影响.结果表明:采用核壳聚合法可制得性能优异的涂饰剂;当阴/非乳化剂比例为2:1,复合乳化剂用量为1.5%～4.0%,化学交联剂和螯合交联剂的用量分别为2%～4%和0.5%～1.5%时,乳液的聚合过程稳定,应用效果较好.     

纺织品粘合剂用丙烯酸酯乳液的合成与应用

以丙烯酸酯类单体为原料，制备了一系列丙烯酸酯乳液，研究了单体配比、乳化剂种类及用量、交联剂种类及用量对乳液及其制备粘合剂的性能影响，制备了一系列具有手感软、干湿擦和水洗牢度佳的丙烯酸酯乳液。     

丙烯酸改性废革屑胶原蛋白的研究

以丙烯酸类单体和废革屑中提取的胶原蛋白为原料,以过硫酸钾(KPS)为引发剂,选用阴离子和非离子乳化剂进行复配作为乳化剂,通过种子乳液聚合方法合成胶黏剂,采用FTIR、TG等测试技术进行表征,考察单体的配比、加料方式、复配乳化剂用量、反应温度、反应时间等因素对乳液性能和胶膜性能的影响。研究结果发现,最佳反应条件为:采用半连续种子乳液聚合法,软硬单体配比为9∶1、乳化剂用量为2%、反应温度为85℃,反应时间为5~6 h。     

影响丙烯酸类核壳乳液形态结构的因素

本文论述了单体的性质和加入方式；引发剂，乳化剂的种类，用量和加入方式；交联剂的用量和加入方式等因素对核壳乳液形态结构的影响。     

低温无醛聚丙烯酸酯乳液的合成及研究

采用丙烯酸酯类单体,以过硫酸钾(KPS)为引发剂并加入自制的交联单体进行乳液聚合.通过研究引发剂用量、阴-非乳化剂配比、乳化剂用量、反应温度、反应时间、交联剂用量对低温无醛聚丙烯酸酯乳液性能的影响并且确定最佳乳液合成条件:乳化剂的用量为单体总量的0.8%,阴-非离子乳化剂配比为3:4,引发剂用量为单体总量0.4%,反应温度为80～85℃,滴加时间、保温时间都为60min.     

高固含量丙烯酸酯乳液聚合稳定性的研究

本文介绍了一种以EA／BA／MMA／NMA为单体制备稳定的高固含量丙烯酸酯乳液的方法,并就不同复合单体组合、乳化剂、交联剂及引发剂的用量对乳液聚合稳定性的影响进行了讨论。结果表明：复合乳化剂、交联单体和引发剂的最佳用量分别为单体总量的3％、2％和0．5％。     

乳液型发动机滤纸浸渍剂的合成及其性能

采用种子乳液聚合的方法合成了平均粒径在120nm左右的丙烯腈（AN）／苯乙烯（ST）／丙烯酸丁酯（BA）共聚物乳液，研究了动力学参数对聚合的影响，确定了最佳合成工艺条件，考察了单体配比、乳化剂用量以及交联剂用量对共聚物的耐水耐油性能的影响，将合成的共聚物乳液用于发动机滤纸浸渍试验，发现经丙烯腈和交联单体改性的共聚物乳液可显著提高滤纸的物理强度、挺度和防水性能。     

胶乳型互穿聚合物网络丙烯酸酯涂饰剂的制备及性能研究

采用乳胶型互穿聚合物网络(LIPN)技术制备了新型改性丙烯酸树脂涂饰剂。系统研究了交联剂乙二醇二丙烯酸酯的合成方法,核-壳单体组成,交联剂和乳化剂的用量及加入方式等对乳液性能的影响;对胶乳性能及胶膜物理性能进行了测试。研究表明采用LIPN技术,可以显著改善丙烯酸树脂涂饰剂的性能。     

无甲醛聚丙烯酸酯乳液的制备及性能评价

采用乳液聚合,以丙烯酸甲酯(MA)、丙烯酸丁酯(BA)和苯乙烯(St)为基本聚合单体,丙烯酸(AA)、甲基丙烯酸缩水甘油酯(GMA)替代N-羟甲基丙烯酰胺(NMA)为活性单体,十二烷基硫酸钠(SDS)、复合脂肪醇聚氧乙烯醚(复合AEO)替代传统的OP系乳化剂,过硫酸铵(APS)为引发剂,制备了无甲醛聚丙烯酸酯乳液.研究了单体选择及配比、预乳液pH、乳液pH及自制无甲醛交联剂用量对单体转化率及乳液应用性能的影响.结果表明:w(BA)=58％,w(MA)=28％,w(St)=10％,预乳液pH=4,乳液pH=8,GMA用量3.0％(对单体质量)时,可使制备的乳液具有优异的综合性能.     

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