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Atar Musa Keskin Hakan Güçlü Yavuzcan H. 《Journal of Coatings Technology and Research》2004,1(3):219-224
The impacts of impregnation and bleaching on the varnish layer hardness of Oriental beech (Fagus orientalist L.) wood were investigated. A number of bleaching combinations {[NaOH−H2O2], [NaOH−Ca(OH)2−H2O2], [NaOH−MgSO4−H2O2] [NaHSO3−H2C2O4], [NaSiO3−H2O2], [KMnO4+NaHSO3+H2O3]} were applied at 18% concentration for bleaching to both impregnated and unimpregnated specimens of Oriental beech wood.
Subsequently, water-based (WB) varnish was coated over the samples and the varnish layer hardness values were determined in
accordance with ASTM D 4366-95.
All of the chemicals used for bleaching reduced the surface hardness. However, after varnish coating, the hardness of most
samples was similar to that of the varnish-coated natural (control) samples. 相似文献
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In this study, a kinetic model of the final bleaching stage with hydrogen peroxide in a totally chlorine free (TCF) bleaching sequence for ALCELL® processed pulp was developed. The model was based on the rate of chromophore destruction characterized by the decrease in the light absorption coefficient of bleached pulp at 457 nm, CK. Based on the fact that the chromophore destruction proceeds rapidly in an initial phase followed by a much slower reaction during which a “floor-level” chromophore concentration is approached asymptotically, we propose that the hydrogen peroxide stage of the ALCELL® derived pulp in the studied TCF sequence consists of two distinct phases. The initial phase is a very fast reaction. The rate equation of the second phase was determined as: which is valid in a pH range of 10.5 to 11.5 and a temperature range of 60 to 92.5°C. 相似文献
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The disposal and re-use of spent bleaching clay from the vegetable oil processing industry is a problem of growing importance.
Although today the only practical way of removal of the spent material is disposal, extraction with organic solvents is a
well-known method of de-oiling contaminated bleaching clay. In our investigations we compare the extractibility of two different
types of bleaching clays with CO2 as a solvent. All experiments were carried out with a high-pressure extraction plant. The extraction and separation conditions,
temperature and pressure, as well as the CO2 mass flow, were varied during experiments. The aim of our investigations was a complete separation of the oil from the adsorbent.
The latter should then be re-used as bleaching clay. The oil and the bleaching clay were analyzed and tested, respectively.
The results show that oil of good quality can be recovered and the bleaching clay still has an activity approximately 50%
of fresh clay. 相似文献
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二氧化氯的生产和应用评述 总被引:17,自引:1,他引:17
详细评述了 2 0世纪二氧化氯的主要生产工艺和制备方法及二氧化氯作为漂白剂、消毒杀菌剂、水处理剂等在多种行业中的应用 ,分析展望了 2 1世纪二氧化氯的生产和应用前景 ,认为应在我国大力发展二氧化氯的生产并促进其应用。 相似文献
8.
姜生 《南通纺织职业技术学院学报》2010,10(3):1-4
在亚麻织物前处理加工过程中较难去除的是亚麻麻皮木质素,针对亚麻织物前处理工艺中亚麻麻皮的漂白或去除难易程度进行了试验,并探讨了原色纱亚麻织物中麻皮木质素漂白或去除适用的加强煮练、氯漂、酸洗等工艺方法. 相似文献
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为解决柔性装配系统的调度问题,采用分层时延Petri网模型与蚁群优化算法相结合,将柔性装配系统分解成诸多个装配体,每个装配体再分解成多个柔性装配单元,对装配单元分别建模并用蚁群算法对装配方案遍历优化,最后确定装配系统的时延Petri网模型.该方法融合了Petri网和蚁群算法各自的优点,较好地解决了柔性装配系统中的装配建模和装配任务的分配优化问题.实验证明该研究可行有效. 相似文献
10.
Masami Fujiwara Takamitsu Tamura Yasuhiro Akabane 《Journal of the American Oil Chemists' Society》1995,72(1):97-103
The reaction of N-chloro-4-hydroxy-2,2,6,6-tetramethylpiperidine (TMP-Cl) with sodium perborate (PB) was investigated with
special reference to the generation of singlet oxygen and the possible application to a new oxidative bleaching process. Generation
of the singlet oxygen (1O2), the hydroxyl radical (HO·) and superoxide anion radical (O2·−) in the PB/TMP-Cl mixed solution was confirmed by the trapping reagent method. From the results of another experiment, in
which the bleaching abilities of each active oxygen species were confirmed, the main active oxygen species contributing to
the bleaching of purpurogallin, the skeleton of black tea pigment, in the PB/TMP-Cl system was concluded to be1O2. 相似文献