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研究了家电卷材涂料的实际应用情况,从原料选择开始按照家电卷材涂料的性能标准,包括RoHS(电子电气设备中限制使用某些有害物质指令)环保指令要求来设计配方,选用钙离子交换二氧化硅作为环保防锈颜料,分析并讨论了底漆和面漆组分对涂料物理性能和防腐蚀性能的影响。实验结果表明:影响家电卷材涂料物理性能的主要因素是面漆中聚酯树脂和氨基树脂的配比,以及酸催化剂的用量;影响家电卷材涂料防腐蚀性能的主要因素是底漆中防锈颜料的添加比例。 相似文献
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国内的卷材涂料多数采用金红石型钛白粉,但由于金红石型钛白粉价格昂贵,且国内生产产量有限,这样便得锐态型钛白粉在卷材涂料中的应用有一定的潜力和前景。本文作者金斌先生从卷材涂料的性能和组成出发,讨论了钛白粉在涂料中的作用,分析了锐态型钛白粉质量指标在卷材涂料中应用性受限制的原因,提出一系列改进措施,来达到锐态型钛白粉在卷材涂料中广泛应用的目的。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure. 相似文献
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Process schemes for implementation of the optimum conditions of the final stage of orientational drawing of PP fibre are proposed based on the results of mathematical modeling. The existence of successive stages of transformation of the structure of PP fibre in the second stage of orientational drawing was experimentally confirmed with indirect indexes. The necessity of selecting the draw ratio that ensures completeness of the given stage of structural transformation is demonstrated. Structural schemes are proposed for automated control systems for selecting the optimum draw ratio in the first and final stages of orientational drawing and control of the structure of the spun polymer with indirect parameters. 相似文献
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Based on the filtration equations with account of heat transfer in the heating region, the problem of instability of small
perturbations of the wave front of filtration combustion of a gas is solved. Expressions for the growth decrement and critical
transverse size of a perturbation are obtained. The problem of the wave-front stability is solved with account of the macroscopic
redistribution of filtration in the system. The solution includes macroscopic characteristics such as the transverse size,
the width of the high-temperature zone, etc. A method is proposed for taking into account the influence of the characteristics
of the system on the evolution of perturbations. It is shown that small deformation perturbations of the front always increase
to a certain amplitude; their subsequent development— continuation of their growth or stabilization—is determined by the characteristics
of the system.
Translated fromFizika Goreniya i Vzryva, Vol. 35, No. 5, pp. 3–5, September–October 1999. 相似文献
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Summary Investigation of the TEMPO-mediated polymerization of styrene at different regimes of addition of AIBN initiator showed that the course of the polymerization could be changed dramatically by a mode of the initiator addition without using any other additives. A very significant acceleration of the polymerization was reached at a specific regime without broadening the polydispersity of the resulting polymer. 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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L. B. Khoroshavin I. I. Ovchinnikov E. Ya. Gimpelman 《Refractories and Industrial Ceramics》1994,35(12):415-416
The efficiency of the use of various refractories is estimated by an objective factor, namely, the coefficient of optimality of linings of heating units.Translated from Ogneupory, No. 12, pp. 26 – 27, December, 1994. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献