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本研究采用湿式抄纸法制备了陶瓷填料导热纸(TC导热纸),研究了助留剂阳离子聚丙烯酰胺(CPAM)添加量对导热填料(Al2O3)留着率的影响,探讨了Al2O3添加量、增强型化学助剂(阳离子型两性聚丙烯酰胺(CAm PAM)、阴离子型两性聚丙烯酰胺(AAm PAM)、湿强剂(PAE))添加量对TC导热纸强度的影响,并比较了BN、Si C、Al2O3导热纸的热导率。结果表明,随着CPAM添加量的增加,Al2O3单程留着率不断提高,CPAM添加量为0.025%~0.05%较佳。随着Al2O3添加量的增加,TC导热纸抗张指数减小,Al2O3添加量小于60%时,TC导热纸仍能获得较好的强度。添加0.2%的CAm PAM能显著提高TC导热纸的抗张指数且对Al2O3单程留着率影响较小,此时当Al 相似文献
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论纸的六大系列(下) 总被引:1,自引:0,他引:1
第三,机制纸(Machine—madePaper)。这是眼下人们最为关注的课题。现代生产的纸(包括纸张和纸板)99%是机制纸。全世界每年的产纸量已达2亿吨以上(199年是2.4亿吨)。从19世纪初叶机制纸兴起以来,其发展之迅猛真可用“蒸蒸日上”来形容。在100多年的时光里,制浆系统由间歇走向连续,造纸系统的抄速由每分钟几十米提高到干米以上。日产数百吨的纸厂已司空见惯。造纸厂的面貌发生了巨大的变化,这是众所周知的。可是,我们不要忘记机制纸生产的特点:①建厂费用高;②原料需量大;③能源消耗多;④废水污染重。这样,就带来了两个重… 相似文献
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为了提高碳纸的导电、导热性,采用电阻小且导热系数高的中间相沥青基碳纤维为原料,部分替代聚丙烯腈基碳纤维以制备碳纸;研究了中间相沥青基碳纤维不同添加比例对碳纸的微观形貌、结晶结构及导电、导热性能的影响。结果表明,随着中间相沥青基碳纤维添加比例的提高,碳纸的石墨化度明显提升,导电、导热性能显著增加。当中间相沥青基碳纤维与聚丙烯腈基碳纤维的质量比为3∶7时,经过石墨化的碳纸石墨化度为97.4%,与石墨化后纯聚丙烯腈基碳纸相比,电阻率由6.80 mΩ·cm降低至4.37 mΩ·cm,降低了35.7%;垂直表面的导热系数由0.084 W/(m·K)提高到0.159 W/(m·K),提高了88.8%。 相似文献
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本文以铜版纸的生产过程为线索,论述了铜版原纸(预涂原纸)、涂布纸、超压纸的生产过程中所产生的纸病,以及解决方法。 相似文献
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蔬菜纸制备技术的研究 总被引:5,自引:0,他引:5
以上海青为材料,探讨了蔬菜纸的成型工艺和干燥方法,包括支撑材料、干燥方法、成型配料和调味配方的确定。结果表明:采用布料做支撑材料,使用微波干燥,菜纸成型效果最好,加工时间最短;感官评价结果显示:采用以上方法制备菜纸的最佳成型配方为:青菜400g、水40mL、CMC0.8g、海藻酸钠0.6g、大豆分离蛋白0.5g、可溶性淀粉1.5g;最佳调味配方为:麦芽糊精5g、水15mL、盐1g、味精0.1g、鸟苷酸0.1g、大豆水解蛋白0.02g、虾粉0.4g、白糖0.5g。 相似文献
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聚苯胺/纸浆纤维复合制造导电纸(Ⅰ)--吸聚条件对导电纸性能的影响 总被引:2,自引:1,他引:2
采用原位吸附聚合法使苯胺聚合于纸浆纤维的微孔壁中制备了导电纸。系统地研究了氧化剂K2S2O8和(NH4)2S2O8用量、反应温度、反应时间等对导电纸表面电阻率的影响。优化了制备导电纸的最佳吸聚条件:聚合时间105min,反应温度5℃,氧化剂的用量取决于氧化剂的种类。当K2S2O8为氧化剂时,氧化剂与苯胺质量比为1:2最佳,导电纸的表面电阻率为481Ω/cm^2;当(NH4)2S2O8为氧化剂时,氧化剂与苯胺质量比为3:4最佳,导电纸的表面电阻率可达108Ω/cm^2。作为氧化剂,(NH4)2S2O8优于K2S2O8。 相似文献
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聚苯胺/纸浆纤维复合制造导电纸(Ⅱ)——掺杂条件对导电纸性能的影响 总被引:1,自引:0,他引:1
以过硫酸铵为氧化剂,采用原位吸附聚合法,将苯胺聚合于纸浆纤维的微孔壁中以制造导电纸。系统地研究了掺杂酸种类、掺杂酸浓度、二次掺杂温度、二次掺杂时间及共掺杂等掺杂条件对导电纸性能的影响。研究表明,有机磺酸(对甲苯磺酸和磺基水杨酸)和硫酸的掺杂效果较好,掺杂酸浓度为0.6 mol/L,二次掺杂温度低于35℃和时间少于7.5 h时导电纸的表面电阻率较低。将对甲苯磺酸和硫酸共掺杂,二者的物质的量比为2∶1时,可获得最佳的掺杂效应。 相似文献
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Edible and Biodegradable Starch Films: A Review 总被引:4,自引:0,他引:4
Alberto Jiménez María José Fabra Pau Talens Amparo Chiralt 《Food and Bioprocess Technology》2012,5(6):2058-2076
Mainly due to environmental aims, petroleum-based plastics are being replaced by natural polymers. In the last decades, starch
has been evaluated in its film-forming ability for applications in the food packaging area. Characteristics of the starch
film matrices, the film formation methods, and physicochemical properties of the starch films are reviewed in this paper.
The influences of different components added in casting methods and thermoplastic processes have been also analyzed. Comparison
of mechanical properties of newly prepared starch films and stored films reveals that the recrystallization phenomenon made
the films more rigid and less stretchable. These effects can be inhibited by adding other polymers to the starch matrix. Other
approaches to improve the starch films’ properties are the reinforcement by adding organic or inorganic fillers to the starch
matrix as well as the addition of functional compounds. In this way starch films have improved mechanical and barrier properties
and can act as a bioactive packaging. Physicochemical properties of the starch films showed a great variability depending
on the compounds added to the matrix and the processing method. Nevertheless, dry methods are more recommendable for film
manufacturing because of the greater feasibility of the industrial process. In this sense, a better understanding of the nano
and microstructural changes occurring in the matrices and their impact on the film properties is required. 相似文献
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A. E. Paterson 《Journal of the Institute of Brewing》2011,117(4):608-616
This article provides an overview of the formation of soil films, their composition, effects and control measures that can be applied in the beverage industry, focusing on the negative aspects of their formation. The positive aspects utilised in bioreactors and fermentation reactions will not be reviewed here. Soils gain access to equipment surfaces and these form soil films that are an assembly of microbial cells, organic and inorganic foulants, irreversibly attached to a surface, and enclosed in an extracellular polymeric substance (EPS) matrix. The EPS is vital in the structure and functioning of different soil film communities. Soil films are responsible for the deterioration of water and corrosion in water distribution systems, food contamination, reduced product quality in the beverage industry, infection on medical surfaces, plaque build up on teeth, increase in fuel costs on ships, decrease in heat transfer in heat exchangers and deterioration of metal due to microbial activity during microbiologically influenced corrosion (MIC). 相似文献
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In this study,a straightforward,one-step wet-end formation process was employed to prepare cellulose/graphene conductive paper for antistatic packing materials.Cationic polyacrylamide was introduced into the cellulose/graphene slurry to improve the graphene loading on the surfaces of the cellulose fibers.The effect of the super calender process on the properties of the cellulose/graphene conductive paper was investigated.When 55 wt% graphene was added,the volume resistivity of the cellulose/graphene conductive paper was 94.70 W·cm,decreasing to 35.46 W·cm after the super calender process.The cellulose/graphene conductive paper possessed excellent anti-static ability and could be used as an anti-static material. 相似文献