石油树脂中性施胶剂的研制

目前已开发出了许多中性施胶剂,如烷基乙烯酮二聚体（ＡＫＤ）、长链烯基琥珀酸酐（ＡＳＡ）、硬脂酸酐（ＳＡ）等,但由于使用条件和价格的限制,它们在国内还不能广泛推广。为此我们在查阅了国外各种施胶剂资料的基础上,选用价格较低的石油树脂为主要原料,经过加成和阳离子化等反应,再与其他胶料复合进行乳化,得到一种新型石油树脂施胶剂,其性能优良、价格较低、使用方便。１石油树脂中性施胶剂的制备１．１原料（１）石油树脂为裂解石油制取乙烯中所得的Ｃ５～Ｃ９馏份,在一定条件下经催化聚合而成的一种低相对分子质量的热塑性树…     

阳离子石油树脂施胶剂在纸袋纸中的应用

用新型阳离子石油树脂中性施胶剂,替代松香施胶剂在纸袋纸生产线上应用。分析了该施胶剂的施胶效果,以及影响施胶度的各种因素探讨使用该施胶剂后,生产上出现的异常情况和应对措施;评价使用纸袋纸生产使用中性施胶剂的可行性和经济效益。     

MS合成中性施胶剂的应用

中性施胶抄纸的主要问题是中性胶料。中性施胶剂分为二类,一类是能与纤维直接反应的反应性施胶剂;另一类为自己能定着在纤维上的阳离子施胶剂,Ms合成中性施胶剂就是属于后者的阳离子胶料。MS合成中性胶为轻工业部造纸工业科学研究所协同牡丹江石油化工设计研究所研制的一种中性胶。牡丹江石油化工设计研究所目前已投入生产,目前暂定价1万元/吨     

阳离子石油树脂施胶剂留着效率及影响因素的研究

本文利用Britt动态滤水仪与紫外分光光度计相配合,测定了阳离子石油树脂施胶剂在漂白麦草浆中的留着效率,初步探讨了pH值、胶料用量、明矾用量、PAE用量、碳酸钙加填量、剪切力等因素的影响.实验结果表明,在加入适量PAE的情况下,该施胶剂在中性条件下有较好的留着率.     

用C_9石油树脂作松香增效剂

用C9石油树脂作松香增效剂,利用阳离子复配型乳化剂制备阳离子分散松香胶,研究C9石油树脂含量、硫酸铝用量,施胶剂用量及抄纸PH值对纸张施胶度的影响.结果表明:加入5%～10%的C9石油树脂作松香增效剂,可以显著提高阳离子分散松香胶的施胶效率,且在施胶剂加入量1%、硫酸铝加入量2%下获得理想施胶效果,并在pH7的中性条件下,仍然具有良好的施胶性能.     

烯基琥珀酸酐的乳化及应用条件

石油树脂中性施胶剂类基琥珀酸酐（ASA）本身是水不溶性的且易发生水解，需加入乳化剂和分散剂使之分散于水，与纸浆纤维形成化学结合，讨论了在ASA使用前加入阳离子大分子对其乳和用苯乙烯二甲烷基乙基丙烯酸酯聚共聚物作为乳化剂和分散剂，以及影响ASA应用效果的各种因素。     

阳离子分散石油树脂胶施胶机理的初步研究

合成了一种新型的阳离子分散石油树脂胶,并将其在漂白麦草浆中进行了施胶实验,用对纸页进行扫描电镜观察、扫描电镜-X衍射能谱分析及差示扫描量热分析等手段,初步探讨了阳离子分散石油树脂施胶剂的施胶机理.分析结果表明,胶料粒子在浆料中能依靠其正电性与带负电的纤维结合,在适宜的温度下,胶料发生软化和铺展,其极性基团部分与纤维结合,疏水的非极性部分转向纤维的外侧,从而完成施胶过程.     

造纸浆内施胶剂的研究应用进展

综述了浆内施胶剂在国内外造纸工业中的应用现状及研究进展,指出AKD和ASA的水解仍是浆内施胶剂开发与使用中的重要问题,开发廉价高效的乳化剂是反应性施胶剂研究的方向和重要任务;适应中性抄纸的松香类高效施胶剂的开发研究工作的重点,应放在新型阳离子松香胶施胶剂的开发应用和与其它施胶剂的协同作用试验上;适合石油树脂的新型高效乳化剂的开发以及石油树脂胶与其它施胶剂的协同施胶作用的试验也是研究开发的重点.     

三种育果袋纸浆内施胶剂的对比试验

提高育果袋纸的抗水性是主要研究方向,施胶剂更是这一研究的重点。本实验选用ASA(烯基琥珀酸酐)、AKD(烷基烯酮二聚体)和复合胶料(蜡乳液与阳离子分散松香胶的混合乳液),分别对育果袋纸进行浆内施胶,对3种施胶剂的应用性能、施胶效果和成本进行了对比,并研究了不同施胶剂对成纸的持久抗水性能的影响。实验结果表明:3种施胶剂均能满足要求,但是从施胶效果和持久抗水性方面,中性施胶剂ASA和AKD优于复合胶料;持久抗水性方面ASA和AKD制得成纸的施胶度变化率为9.09和7.23,而复合胶料高达22.22;复合胶料的成本最低。     

阳离子松香中性施胶剂的制备及应用

采用自制的阳离子乳化剂乳化松香和改性松香制备了一种阳离子松香中性施胶剂,介绍了该施胶剂的制备技术、应用特性,并对纸张施胶度的影响因素进行了探讨。实验结果表明,阳离子松香中性施胶剂质量稳定、施胶效率高、可用于中性条件下施胶,在pH为6.0~8.0的范围内能获得满意的施胶效果。     

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