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1.
采用水溶液聚合法,以α-烯烃磺酸钠(AOS)和丙烯酸(AA)为原料通过聚合反应制得阴离子共聚物AOS-AA表面活性剂,并将其作为脱墨剂用于废纸脱墨。考察其最佳合成工艺,并研究了该产品与非离子表面活性剂复配的脱墨效果。用红外光谱对所制备的表面活性剂进行分子结构表征,用凝胶色谱分析仪测得其相对分子质量及其分布,并通过扫描电镜对比其与复配脱墨剂及市售脱墨剂的脱墨效果。结果表明,当n(AOS)∶n(AA)=1∶2,引发剂用量为3.0%,聚合温度为85℃,聚合时间为5 h,合成的AOS-AA在pH值为8~9时,脱墨效果最佳;合成的AOS-AA与月桂醇聚氧乙烯醚(AEO-9)进行复配,当m(AOS-AA)∶m(AEO-9)=1∶2,其总用量为0.2%(其他助剂一定)时,旧杂志纸脱墨后白度达72.1%,残余油墨量仅为41.4 mm2/m2。  相似文献   

2.
以α-烯烃磺酸钠(AOS)、丙烯酸(AA)和烯丙基聚氧乙烯醚(APEG-700)为原料进行自由基水溶液聚合反应,合成了一系列AAA型聚合物表面活性剂并将其用于废纸脱墨。考察其最佳合成工艺,并研究了该产品与非离子表面活性剂复配的脱墨效果。用红外光谱(FT-IR)对所制备的表面活性剂进行分子结构表征,用凝胶渗透色谱分析仪(GPC)测得其分子质量及其分布,通过扫描电镜(SEM)对比其与复配脱墨剂及市售脱墨剂的脱墨效果。结果表明,当n(AOS)∶n(AA)∶n(APEG-700)=1∶3∶1,引发剂用量为2.5%(对单体总质量),聚合温度为80℃,聚合时间为5 h,聚合物pH值为8时,AAA型表面活性剂可达到较好的脱墨效果。将合成产物与月桂醇聚氧乙烯醚(AEO-9)和壬基酚聚氧乙烯醚(TX-10)按一定比例复配,当m(AAA)∶m(AEO-9)=2∶1,复配脱墨剂用量为0.2%(其他助剂一定)时,脱墨后纸张白度可达72.4%,残余油墨量为51.2 mm~2/m~2。  相似文献   

3.
以月桂醇聚氧乙烯醚(AEO-3)、异佛尔酮二异氰酸酯(IPDI)和聚乙二醇(PEG)为原料合成了一系列AIP-I-AIP型非离子表面活性剂。通过单因素和正交实验考察了最佳合成工艺,并对合成产物进行了结构表征和物理性能检测;研究了合成产物作为脱墨剂在浮选法废纸脱墨中的应用,将其与其他低分子表面活性剂复配,再与市售脱墨剂的脱墨效果进行对比。结果表明,n(AEO-3)∶n(IPDI)∶n(PEG)=1∶1.5∶1,反应温度70℃,反应时间2 h,催化剂用量1.0%(对单体总质量分数)时,AIP-I-AIP型非离子表面活性剂可达到较好的脱墨效果;合成产物与脂肪醇聚氧乙烯醚硫酸钠(AES)及AEO-3按一定比例复配,m(AIP-I-AIP)∶m(AES)∶m(AEO-3)=1∶2∶1,当复配脱墨剂用量为0.2%(其他助剂一定)时,脱墨浆白度可达68.6%,残余油墨量为41.4 mm2/m2。  相似文献   

4.
以月桂醇聚氧乙烯醚衣康酸单酯(IAEO)、丙烯酸(AA)、甲基丙烯磺酸钠(SMAS)为原料通过共聚反应制得IAEO-AA-SMAS三元共聚物表面活性剂,考察其最佳合成工艺,研究该产物在浮选法废纸脱墨中的应用。用IR对所制备的表面活性剂的分子结构进行表征,以GPC测定其分子量及分布,并通过SEM对比其与市售脱墨剂的脱墨效果。结果表明:当n(IAEO):n(AA):n(SMAS)为1:2:1,聚合温度85℃,聚合时间5.5 h,w(引发剂)用量1.5%时,制成的表面活性剂有最佳的脱墨效果。当其用量为0.2%时,废旧杂志纸脱墨后白度提高10.4%ISO,残余油墨量下降193.1 mm2·m-2,效果优于同类市售脱墨剂。  相似文献   

5.
本文以ONP/OMG混合废纸为脱墨对象,研究了几种脱墨常用的表面活性剂的中性脱墨性能。结果表明,在中性条件下非离子表面活性剂比阴离子表面活性剂有更好的脱墨性能,其中辛基酚聚氧乙烯醚OP-10与脂肪酸甲酯乙氧基化物FMEE的脱墨效果最好。将OP-10与FMEE以6∶4的质量百分比复配后,可以获得最佳的协同增效作用,以此比例复配的脱墨剂用量0.25%,在中性条件下的脱墨工艺中可以使脱墨浆白度提高5.2%ISO,浮选后浆的ERIC值为147mg/kg,浮损率为6.7%。  相似文献   

6.
以衣康酸(IA)和月桂醇聚氧乙烯醚(AEO-9)为原料,制备出一种可用于合成高分子表面活性剂的单体月桂醇聚氧乙烯醚衣康酸单酯(IAEO),将其与丙烯酸(AA)、甲基丙烯磺酸钠(SMAS)进行聚合反应,合成了一系列IAS型高分子表面活性剂并将其用于废纸脱墨。考察了最佳合成工艺及复配条件,并测定了其表面化学性能。结果表明,当酯化时间4 h,酯化温度125℃,n(IA)∶n(AEO-9)=1∶1.06,催化剂用量6.5%;聚合时间5.5 h,聚合温度85℃,n(IAEO)∶n(AA)∶n(SMAS)=1∶2∶1,引发剂用量1.5%时获得的IAS型表面活性剂具有较佳的脱墨效果,且乳化性能及分散性能优于AEO-9。将IAS型高分子表面活性剂与壬基酚聚氧乙烯醚(TX-10)按质量比1∶2复配时(复配表面活性剂总质量占绝干浆质量的0.2%),脱墨效果进一步提高,脱墨浆白度较单独使用IAS型高分子表面活性剂时提高2.3个百分点,残余油墨量下降12.9 mm2/m2。  相似文献   

7.
贾路航  王子千 《湖南造纸》2013,(2):23-25,40
本文以ONP/OMG混合废纸为脱墨对象,研究了几种脱墨常用的表面活性剂的中性脱墨性能。结果表明,在中性条件下非离子表面活性剂比阴离子表面活性剂有更好的脱墨性能,其中辛基酚聚氧乙烯醚OP-10与脂肪酸甲酯乙氧基化物FMEE的脱墨效果最好。将OP-10与FMEE以6:4的质量百分比复配后,可以获得最佳的协同增效作用,以此比例复配的脱墨剂用量0.25%,在中性条件下的脱墨工艺中可以使脱墨浆白度提高5.2%ISO,浮选后浆的ERIC值为147mg/kg,浮损率为6.7%。  相似文献   

8.
马来酸单酯-丙烯酸共聚物的合成及其脱墨效果   总被引:1,自引:0,他引:1  
以不同相对分子质量的聚乙二醇与马来酸酐制备马来酸单酯,再与丙烯酸聚合生成马来酸单酯-丙烯酸共聚物.较佳反应条件为:酯化反应温度75℃,投料比n(醇):n(酸酐)=1:1.05,反应时间1 h;聚合温度85℃,m(MAG):m(AA)=1:1,w(引发剂)=1.5%,反应时间6h.将马来酸单酯-丙烯酸共聚物与其他非离子表面活性剂复配,从中筛选出较佳的脱墨剂配方:m(AZ-1000):m(AESM-9):m(NPSS-10)=2:3:3,同时采用如下脱墨工艺:w(NaOH)=2%,w(NaSiO3)=3%,w(脱墨剂)=0.3%,w(过氧化氢)=2%,w(EDTA)=0.2%,可使脱墨纸浆白度达64.3%ISO,残余油墨量为2.4mm2/g,得率77.6%.  相似文献   

9.
以月桂酸二乙醇酰胺(LDEA)、异佛尔酮二异氰酸酯(IPDI)和不同相对分子质量的聚乙二醇(PEG)为原料制备了一系列LIP型非离子表面活性剂;探讨了最佳合成工艺条件,并对产物进行了结构表征和物理性能检测;研究了合成产物在浮选法废纸脱墨中的应用,并将其与复配脱墨剂以及市售脱墨剂的脱墨效果进行对比。结果表明,使用相对分子质量600的PEG,在反应温度55℃,反应时间2 h,催化剂用量为单体LDEA的1.0%,n(LDEA):n(IPDI):n(PEG)=1.0:2.0:2.0时,合成表面活性剂具有较好的浮选脱墨效果;将LIP-600、月桂醇聚氧乙烯醚(AEO-9)和脂肪醇聚氧乙烯醚硫酸钠(AES)按质量比2:1:1复配,复配表面活性剂总质量占绝干纸质量的0.2%时,废纸脱墨效果进一步提高,脱墨后纸浆白度可达72.3%,残余油墨量为51.4 mm~2/m~2。  相似文献   

10.
以不同相对分子质量的聚乙二醇与马来酸酐制备马来酸单酯,再与丙烯酸聚合生成马来酸单酯-丙烯酸共聚物.较佳反应条件为:酯化反应温度为75℃,投料比n(醇):n(酸酐)=1:1.05,反应时间1h;聚合温度85℃,m(MAG):m(AA)=1:1,w(引发剂)=1.5%,反应时间6h.将马来酸单酯-丙烯酸共聚物与其他低离子表面活性剂复配,可使脱墨纸浆白度达64.3%ISO,残余油墨量2.4mm2/g,w(得率)=77.6%.  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
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.  相似文献   

14.
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.  相似文献   

15.
BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H2O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.  相似文献   

16.
17.
A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.  相似文献   

18.
19.
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.  相似文献   

20.
<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  相似文献   

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