无皂苯丙聚合物/AKD乳液表面施胶剂的制备与应用

以甲基丙烯酸(MAA)、苯乙烯(St)、丙烯酸丁酯(BA)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)为单体,通过无皂乳液共聚反应制备了一种两性聚合物乳液表面施胶剂(ASAP)。以其为分散稳定剂制备了ASAP/AKD乳液表面施胶剂。以质量分数为0.15%的ASAP/AKD、质量分数为5%氧化淀粉表面施胶液,施涂量为1.2g/m2,对草木混合浆抄造纸张进行表面施胶,施胶度达113s。在ASAP/AKD乳胶质量分数为0.20%时,能显著改善纸张表面强度,耐折度、环压指数分别提高71.4%和40.7%。     

一种新型阳离子复合表面施胶剂的研制及应用

研制了一种新型阳离子复合(AKD-石蜡)表面施胶剂,考察了该施胶剂对瓦楞原纸的施胶效果。结果表明,自制新型阳离子复合表面施胶剂制备工艺简单;相同施胶量下与阳离子SAE施胶剂相比,新型阳离子复合表面施胶剂施胶纸的纵向环压指数、耐破指数和耐折度分别提高14%、8%和25%;当施胶量为2 kg/t纸时,与阳离子SAE施胶剂相比,表面施胶成本降低4元/t纸。     

阳离子含氟PUA表面施胶剂的制备及应用

为制备一种能够明显提高纸张施胶效果和印刷性能的聚合物表面施胶剂,以2,2,3,4,4,4-六氟丁醇甲基丙烯酸酯(FA)、苯乙烯(St)、丙烯酸丁酯(BA)为单体,在交联聚氨酯溶液(PU)中通过溶液聚合相转化法制得阳离子含氟聚氨酯-丙烯酸酯复合乳液(FPUA)表面施胶剂.用FT-IR、TEM和纸张物理性能检测的手段对聚合物结构、乳胶粒子形态以及应用性能进行了表征.实验结果表明,以质量分数为1.0%的FPUA进行表面施胶时,可使纸张的施胶度和拉毛速率分别达到9.50 s和2.80 m/s以上,油墨吸收率为26.0%～29.0%;乳胶粒子呈球形,其粒径约为230nm.     

PA-钠水玻璃复合表面施胶剂的应用

以无机盐固化剂PA和钠水玻璃为原料,制备了PA-钠水玻璃复合表面施胶剂,并对瓦楞原纸进行表面施胶处理.讨论了该复合表面施胶剂对瓦楞原纸环压强度、耐破度及抗水性能的影响,并分析了施胶后纸张的表面微观结构.与传统表面施胶剂相比,该复合表面施胶剂固含量高、黏度低,易于控制涂布量,涂层挺硬.将其应用于瓦楞原纸表面处理后,在双面施胶量9 g/m2时,纸张耐破指数比原纸增加了35％,环压指数是原纸的3.2倍.     

苯乙烯马来酸单辛酯共聚物乳液表面施胶剂的合成与应用

以苯乙烯、马来酸酐和马来酸单辛酯为原料,以过氧化苯甲酰为引发剂,在甲苯中进行共聚,经过沉淀分离、用氨中和后制备出苯乙烯-马来酸单辛酯-马来酸酐共聚物乳液表面施胶剂.采用GPC得到了苯乙烯-马来酸单辛酯-马来酸酐共聚物的分子质量,利用SEM观察了施胶纸张的表面情况,苯乙烯-马来酸单辛酯-马来酸酐共聚物对纸张进行表面施胶时,能提高纸张的施胶度和表面强度,施胶剂(玉米氧化淀粉与共聚物乳液的质量比为401)用量为1.-g/m2时,施胶度为9 s,抗张强度提高6.8%,耐破度提高10.1%,印刷表面强度为2.87 m/s,油墨吸收性为42%,应用实验表明该共聚物是一种高效的纸张表面施胶剂.     

磷石膏部分替代淀粉用作施胶剂的实验

主要研究磷石膏在造纸表面施胶剂中的应用。以磷石膏替代一定比例的表面施胶淀粉,用于瓦楞原纸表面施胶。实验表明:50%的磷石膏替代淀粉对原纸施胶后的环压指数为7.69 N.m/g,拉毛速度为2.29 m/s,加入0.3%AKD施胶后抗水时间为163.4 s,满足了瓦楞纸指标要求。磷石膏综合利用变废为宝,既降低造纸生产成本,又节约粮食资源。     

SMBD表面施胶剂的制备及应用

以马来酸酐和聚乙二醇2000为原料制备了反应型乳化剂马来酸聚乙二醇酯,然后以苯乙烯(St)、甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)和甲基丙烯酰氧乙基三甲基氯化铵(DMC)为单体,以马来酸聚乙二醇酯为乳化剂、以过硫酸钾为引发剂制备了SMBD表面施胶剂。以表面张力(γ)、临界胶束浓度(CMC)、傅里叶变换红外光谱(FT-IR)和透射电镜(TEM)进行了性能测试和结构表征。表面张力检测结果表明,马来酸聚乙二醇酯的CMC为0.26 g/L,γ为29.0 mN/m。FTIR分析表明SMBD表面施胶剂具有预期的共聚物结构,TEM分析表明SMBD表面施胶剂乳液微粒呈球形结构,微粒直径约70 nm。SMBD表面施胶剂胶膜耐水性明显强于十二烷基苯磺酸钠(SDBS)和壬基酚聚氧乙烯(10)醚(OP-10)作为乳化剂制备的表面施胶剂胶膜,15天后SDBS和OP-10作为乳化剂制备的表面施胶剂胶膜吸水率达44.2%,SMBD表面施胶剂胶膜吸水率仅为18.4%。采用SMBD表面施胶剂和氧化淀粉复配对未施胶轻型纸进行表面施胶,与市售某表面施胶剂和进口某表面施胶剂相比,SMBD表面施胶剂施胶纸张的Cobb值、表面强度、耐折度、撕裂指数和裂断长均优于该市售表面施胶剂,稍优于该进口表面施胶剂。     

有机硅表面施胶剂的制备及性能研究

在H2O2-FeSO4双组分氧化还原体系中,以酶改性淀粉为主链,以苯乙烯(St)、丙烯酸丁酯(BA)、丙烯腈(AN)、丙烯酰胺(AM)、二甲基二烯丙基氯化铵(DMDAAC)和γ-甲基丙烯酰氧基丙基三甲氧基硅烷为单体,通过自由基聚合制备了一种有机硅表面施胶剂。对其工艺条件进行了探讨,最佳工艺为:m(α-淀粉酶)∶m(绝干淀粉)=0.004,m(FeSO4)∶m(H2O2)=0.04,DMDAAC用量为有机硅表面施胶剂的0.6%,AN用量为有机硅表面施胶剂的1.5%,AM用量为有机硅表面施胶剂的0.4%,有机硅单体用量为有机硅表面施胶剂的2%,m(St)∶m(BA)=2,m(单体总量)∶m(淀粉)=2.4。通过红外光谱(FT-IR)、静态接触角和扫描电子显微镜(SEM)对其结构和性能进行表征。结果表明,有机硅表面施胶剂提高了瓦楞原纸的施胶性能,当有机硅表面施胶剂用量为表面施胶液的0.5%时,施胶效果达到最佳。     

核壳型氟化阳离子表面施胶剂的制备及应用

以苯乙烯、丙烯酸丁酯、甲基丙烯酸十二氟庚酯等为原料,不使用有机溶剂及乳化剂,采用自制阳离子聚合物为分散剂合成了核壳型氟化表面施胶剂(FAE).用IR、TEM、纸张物理性能检测等手段对聚合物结构、乳液粒子形态以及应用性能进行了表征.结果表明,以m(氧化淀粉):m(FAE)=85:15的施胶液进行表面施胶,当其施胶量为1.5 g/m2时,可使纸张的吸水性(cobb法)和表面强度分别达到29.9 g/m2和2.97 m/s,抗张指数和耐破指数分别达到58.8 N·m/g和2.76 kPa·m2/g.乳胶粒子呈球形,粒径分布均匀.     

苯乙烯马来酸酐共聚物乳液的合成与应用

以苯乙烯、马来酸酐为原料,以过氧化苯甲酰为引发剂,在甲苯中进行无规共聚,经过沉淀分离、改性制备出了苯乙烯马来酸酐共聚物乳液表面施胶剂。采用IR表征了苯乙烯马来酸酐共聚物的结构。利用SEM观察了施胶纸张的表面情况。结果表明,用苯乙烯马来酸酐共聚物对纸张进行表面施胶,能提高纸张的施胶度和表面强度,施胶剂用量为0.5g/m2时,施胶度为13s,抗张强度提高13.5%,耐破度提高16.0%,与淀粉、PVA复配均有明显的表面施胶效果。     

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.     

Review of techniques to manufacture micro-hydrogel particles for the food industry and their applications

Microgels are ‘soft’ microscopic cross-linked polymeric particles that are being increasingly exploited in a variety of industries for rheology control, encapsulation and targeted delivery. They are valued because of the ability to tune their functionality to address specific applications in oil recovery, coatings, drug delivery, cosmetics, personal care and foods. Food microgels are typically biopolymer hydrogels in the form of microspheres, nanospheres (also called nanogels), spheroids and fibres. The utilisation of engineered microgels in foods has so far been limited, despite their great potential to address several needs in the food industry, including: satiety control, encapsulation of phytonutrients and prebiotics, texture control for healthier food formulations (e.g. reduced fat products), and targeting delivery to specific areas in the digestive tract. We review the scientific and patent literature on the utilisation and manufacturing methods for producing microgels with an emphasis on micro-hydrogels for food applications.     

12—A CRITIQUE OF SOME HYPOTHESES RELATING TO THE HETEROGENEITY OF THE HIGH-SULPHUR PROTEINS OF WOOL

Joubert and Burns prepared a large number of fractions from the high-sulphur proteins of wool and estimated their molecular weights and amino-acid compositions. Their data have been re-examined in order to look for statistically significant interrelations between amino acids and between the proportion of various amino acids and molecular weight. Statistical analysis of the data is also used to examine the credibility of some hypotheses concerning the mechanism of keratin biosynthesis and to provide further evidence for the existence of families of proteins within the high-sulphur fractions of wool.     

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 Latest Data about Development of Chinese Printing Industry in 2013

In the 2014 China（Shanghai）International Printing Week,Director Wang Yanbin released the latest data about development of Chinese printing industry in 2013.According to statistics,in 2013,the total output value of Chinese printing industry exceeded 1trillion Yuan for the first time,reaching 1.03985 trillion Yuan.There were 105,000 printing enterprises in China,employees were 3.415 million.The total asset was 1.06247 trillion Yuan;     

The State Council Issued "Directory of Government Approved Investment Projects(2013 Edition)"

正On December 2nd,2013,the State Council issued the notification of"Directory of Government Approved Investment Projects(2013 Edition)"(hereafter referred to as"notification").It is pointed out in the"notification"that in order to further deepen reforms in investment systems and administrative examination and approval systems,simplify administrative procedures and delegate powers to lower levels,earnestly     

Top Ten News of China's Paper Industry 2013

On December 24th, 2013, the meeting on the selection of top 10 news of China＇s paper industry 2013 sponsored by 〈China Paper Newsletters〉 was held in Beijing. The yearly selection of the top l0 news, which began in 2000, has become a brand activity widely recognized in the industry thanks to the support from the authorities at all levels and public participation.     

National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the "13~(th) Five-Year Plan"

In Apri Commi major p Plan＂ （h 2014, the National Development and Reform ssion issued an announcement for selection of reliminary research projects for the ＂13th Five-Year ereafter referred to as ＂The Announcement＂）     

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 latest scientific     

China textile machinery: taking off in progress

正Among the 1600 exhibitors who take apart in the ITMA ASIA+CITME2014 2/3 are Chinese manufactures.If the numerous figures failed to attract your attention,the increase of quality should draw your focus.To adopt the demand of developing textile machine market,domestic textile machinery enterprises now follow the slogan of"technology drives development"to enhance product competitiveness.Our domestic sellers will showcase product ranging from spinning,weaving,dyeing and printing,