共查询到18条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
脱漆剂的研究进展与展望 总被引:5,自引:0,他引:5
简述了传统化学脱漆剂,包括热碱溶液脱漆剂,酸性脱漆剂和有机溶剂脱漆剂。重点评述了CH2Cl2型有机溶剂脱漆剂配方及其改进配方,并针对其存在的高挥发性、腐蚀性及毒性等缺点,综述了生态型脱漆剂的研究进展。同时指出,添加各种挥发抑制剂、腐蚀抑制剂、增稠剂和分散剂等可降低氯化溶剂类脱漆剂的危害,但不能作为脱漆剂的研究方向。展望了选用非挥发性的酯及芳香化合物作为替代品,N-烷基吡咯烷酮类物质作为配方助剂以及开发乳化体形态的脱漆剂等手段将是脱漆剂配方研究的未来发展方向。 相似文献
5.
脱漆剂的配方和发展趋势 总被引:4,自引:1,他引:3
脱漆剂是涂料工业中重要组成之一,它的作用是清除旧漆膜,为重新涂漆获得清洁的基体,文章简述了传统化学脱漆剂,包括热碱溶液脱漆剂,酸性脱漆剂和有机溶剂脱漆剂的特点、分类及配方,重点介绍了溶剂型脱漆剂的配方组份、作用及原理,认为具有环境友好性能的低、挥发性低毒型的溶剂型脱漆剂、水性脱漆刹和乳液型脱漆剂等为脱漆剂发展的主要趋势. 相似文献
6.
7.
8.
9.
10.
冯福合 《精细与专用化学品》1992,(11)
国家海洋局天津海水淡化与综合利用研究所新近研制出一种水基快速脱漆剂——QVW脱漆剂。这种新型脱漆剂的开发,从根本上解决了目前自行车等行业脱漆工艺落后、能耗高、时间长、费时多、高温作业、工作环境恶劣等诸多弊端。该产品的研制成功,为企业提供了一种安全可靠、优质高效的脱漆剂。新研制的 QVW 脱漆剂,具有常温、快速、 相似文献
11.
12.
针对催化裂化空筒汽提器中存在的气体偏涌现象,在一套大型空筒催化剂汽提器冷模实验装置中利用光纤探针法系统研究了偏涌的特性及其随床层高度的发展变化情况,并进一步利用一种新的离散颗粒计算流体力学模型(CPFD模型)对该现象进行了数值模拟研究.结果表明,在催化裂化汽提器操作条件下,偏涌主要发生在临近床层边壁的位置,造成周向上颗粒浓度分布呈现严重的不均匀性,偏涌的强度会随着床层高度的增大而减弱.CPFD模型不仅能够成功预测深层鼓泡床中存在的偏涌现象,而且可以定性预测偏涌强度沿床层高度的发展趋势,但定量预测结果较实验结果偏大.上述结果对工业汽提器的设计和故障诊断具有指导意义. 相似文献
13.
在内外层算法的基础上,采用联立方程思想将主塔、侧线汽提塔视为一个整体进行建模,并针对复杂炼油塔的特点对算法提出了改进。首先,由于传统内外层法简化的K值模型对组成的变化不敏感,在处理带有石油的体系时,容易出现迭代次数较多,甚至部分塔板温度更新异常的问题,因此采用了汽相分数加和式推导了简化的K值模型加权因子。其次,借鉴流量加和法思想,规定侧线汽提塔的塔底产品流量作为设计变量,增强了算法收敛的稳定性。为验证改进后算法的有效性,采用不同的算法对实际的常压塔进行了模拟,结果显示改进后的算法适合应用于复杂炼油塔的模拟计算。 相似文献
14.
简要介绍了国内多家SNAM型尿素装置钛材氨汽提塔近年来出现的泄漏情况,对其泄漏的原因进行了分析,并对其检修情况作了介绍。 相似文献
15.
Kohei Ueda Hiroshi Kanai Takamasa Suzuki Takeshi Amari 《Progress in Organic Coatings》2001,43(4):233-242
Formability is one of the most important factors for pre-painted steel sheets (PCMs). Both high formability of the steel substrate and high integrity of the paint films on it after processing are required. In this study, elongation, tensile strength and elastic strain energy of various paint films were examined by tensile test, and the relationship between the mechanical properties of paint films and the integrity of paint films of PCM after bending and drawing were studied. We found that the required properties of paint films of PCM depended on the forming mode. In the bending mode, in which steel sheets were mainly subjected to tensile strain, the damage of paint films was dominated by the maximum strain and the tensile strength of the paint films. The paint films having higher maximum strain and higher tensile strength had better formability in bending. On the other hand, the damage of paint films was dominated by the maximum strain of paint films and elastic strain energy stored in paint films after deformation in the drawing mode in which steel sheets were subjected to tensile and compressive strain. The paint films having higher maximum strain and lower elastic strain energy had better formability in drawing. The relationship between the lubrication attributes of paint films and the limit of drawing ratio (LDR) of PCM was also studied. It was observed that the PCM with paint films having low friction coefficient had a higher LDR and it was the same ratio as the unpainted substrates. 相似文献
16.
17.