我国有机锡热稳定剂生产现状与研究进展

综述了我国有机锡稳定剂工艺技术研究进展及产业化现状.指出提高有机锡分子质量是当前有机锡热稳定剂的重点发展方向,有机锡与有机辅助稳定剂、金属盐类复配是改进和提高有机锡稳定效果、降低成本的有效方法,并提出了有机锡热稳定剂发展的相关建议.     

有机锡稳定剂的卫生性能

总结了我国PVC制品用有机锡稳定剂的应用现状及卫生性能,指出了目前有机锡稳定剂产品在开发、生产及其在PVC制品使用中在卫生性能控制上的不足,建议在产品开发、生产和使用中加强有机锡稳定剂卫生性能的研究和控制,以促进有机锡稳定剂在PVC制品中的健康发展。     

有机锡热稳定剂的毒性及其控制与防护

综述了有机锡热稳定剂的毒性;分析了有机锡热稳定剂的毒性及其毒性控制原理;并简述了有机锡热稳定剂的应用防护以及因不当使用而中毒所要采取的有利措施;旨在确保人们能正确认识有机锡热稳定剂的毒性以及防护,为有机锡热稳定剂的安全生产与应用提供理论依据。     

电石法PVC有机锡热稳定体系研究

从流变行为、热稳定时间、热分解温度及力学性能等方面考察了有机锡稳定剂及有机锡/钙锌复合稳定剂在电石法PVC中的应用。结果表明:适量钙锌稳定剂与有机锡稳定剂复配使用,可以在保持电石法PVC加工稳定性的同时,降低热稳定剂的成本;使用有机锡/钙锌复合稳定剂,PVC的弹性模量、拉伸强度明显低于比使用单一有机锡稳定剂时的PVC,但冲击强度和断裂伸长率明显提高。     

稀土稳定剂对PVC性能影响的研究

主要以有机锡稳定剂为对比物,研究了稀土稳定剂对PVC性能的影响。稀土稳定剂对PVC的力学性能、加工性能都有不同程度的提高,稀土稳定剂的热稳定性能符合PVC的加工条件,并有可能替代有机锡稳定剂。     

工业聚氯乙烯（PVC）环保型热稳定剂研究新进展

概述了有机锡类热稳定剂的主要生产工艺、研究现状及其新进展,并详细介绍复合钙/锌类热稳定剂的合成工艺、功能化改性和复配研究。最后对我国工业聚氯乙烯(PVC)用热稳定剂的发展方向提出了建议。     

有机锡稳定剂及其进展

介绍了有机锡稳定剂的合成方法，分析了作用机理，对有机锡稳定剂的一些技术新进展作了综述。     

单烷基有机锡稳定剂的现状及发展

简要介绍了目前国内外有机锡热稳定剂现状。着重论述了单烷基有机锡稳定剂的特点及其研究开发动态，并提出了一种研究开发单烷基有机锡稳定剂的新思路。     

UPVC用有机锡系稳定剂的热稳定性测试方法研究

研究了硬质聚氯乙烯(UPVC)压延用有机锡稳定剂的热稳定性能的评价方法,包括静态烘箱法、动态双辊塑炼法等,考察了有机锡稳定剂对PVC静态、动态及残留热稳定性的影响,结果表明:辛基锡稳定剂具有较好的初期热稳定性,但长期热稳定性大小依次为丁基锡稳定剂甲基锡稳定剂辛基锡稳定剂。     

环氧大豆油对软PVC性能影响的研究

研究了环氧大豆油对软聚氯乙烯(PVC)性能的影响。实验表明,铅盐和有机锡的热稳定性较好,单独使用硬脂酸钙、硬脂酸锌、环氧大豆油或不足量的有机锡热稳定剂时,PVC样品很快变色。环氧大豆油与硬脂酸钙、硬脂酸锌、有机锡热稳定剂并用时,环氧大豆油具有很好的协同效应;但环氧大豆油和硬脂酸钙、硬脂酸锌不能简单替代有机锡稳定剂。热重分析证明了不同热稳定剂的效果。作为辅助增塑剂,环氧大豆油用量应低于5份。     

Process of acceleration of filtration of viscose

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.     

乙烯酮(双乙烯酮)下游产品废水的治理技术

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。     

Approximation of temperature dependence of the modulus of elasticity of glass

A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses.     

生物油的成分分析及物性测定

以添加FeCl2的ZnCl2-KCl混合熔盐裂解纤维素和秸秆,制得生物油。采用傅立叶变换红外光谱法和气相色谱-质谱法分析生物油的成分。结果表明,生物油中成分复杂,含有氧元素、多种有机化合物,主要包括酮类、醛类、酚类及羧酸类等。测定了20～80℃生物油的密度和粘度,发现生物油的密度与温度呈较好线性关系,而生物油的粘度均大于水的粘度,且不同熔盐体系对秸秆生物油的粘度无较大影响。     

A study of miscibility of blends of polybutadienes of varying microstructure

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.     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

粉煤灰中烧失量检测的不确定度分析

以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

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