佩科拉公司推出非污染性硅酮密封胶新品

美国佩科拉(Pecora)公司日前宣布推出一款非污染性硅酮密封胶系列新产品——898NST。898NST硅酮密封胶利用非污染性技术把有机硅的耐久性与抗霉性相结合,而且也消除了传统硅酮密封胶沾污天然石材(如花岗岩、大理石、石灰石)的缺点。898NST已被美国农业部认证为非污染性和卫生性产品,是医院、学校、洁净室、厨房和     

丁苯橡胶中防老剂的剖析

<正> 丁苯橡胶中除含有大量的有机酸为凝聚剂,有机酸皂(钠盐或钾盐)为乳化剂外,还有一定量的防老剂添加。防老剂可分为非污染性防老剂(非胺类的防老剂)和污染性防老剂(胺类防老剂)二大类,根据不同的用途可添加不同的防老剂。本文介绍的是在丁苯橡胶SBR1502中添加污染性防老剂的剖析工作,可供橡胶专业中有关同志参考借鉴之用。 1.仪器及试剂日立270-50型红外光谱仪附日立270-50型数据处理机和日立0301型软盘驱     

防老剂SRP的性能及其应用

介绍了新型防老剂ＳＲＰ的性能和应用，研究了其在胶料中对硫化胶特性的影响，同时也介绍了防老剂ＳＲＰ的非污染性和增粘作用。     

非污染性防老剂

<正> Durazone37是一种优质的非污染性静电和动态抗臭氧剂的优质防老剂,该产品用于天然胶和合成胶中能提高胶料和耐屈挠龟裂性。根据使用者的要求,该优质产品在使用中对人体没有什么危害和污染。作为非污染性防老剂,最大的优点是使橡胶工业橡胶制品达到更高的质量,同时能解决一些橡胶界重大的问题。Durazone37主要适用于轮胎胎侧胶     

炭黑N330在非硫黄调节型粉末CR中的分散性研究

研究炭黑填充型非硫黄调节型粉末CR[简称P(CR／N330)]中炭黑N330的分散性。结果表明，使用包覆剂和增大分散剂的用量可有效提高炭黑N330在P(CR／N330)中的分散性，减轻或消除P(CR／N330)的接触污染性；有接触污染性的P(CR／N330)粒子表面和内部存在游离的炭黑团粒，无接触污染性的P(CR／N330)粒子表面和内部均较为光滑，无游离的炭黑团粒存在。     

橡胶用新型抗氧化剂

Vanox I（一种聚合受阻苯酚）是一种活性非常高，具有非污染性和不褪色性，持续时间长的抗氧化剂，特别适用于BR和破橡胶胶料的防护。据说，Vanox I有效地改善了不同类型弹性体轮胎胶料的耐热性。     

橡胶用新型VanoxⅠ抗氧化剂

R．T．Vanderbit公司报道了一种高活性且持续时间长的抗氧化剂——VanoxⅠ（一种聚合受阻苯酚），它具有非污染性和不褪色性，特别适用于丁二烯橡胶和异戊二烯橡胶胶料的防护。据说，VanoxⅠ有效地改善了不同弹性体轮胎胶料的耐热性。     

不同材质触摸屏保护膜抗污染性研究

通过对不同材质触摸屏保护膜接触角、雾度、规则透射比和镜面反射比的测试，分析了不同保护膜污染前后的光学性能变化。结果表明：钢化玻璃膜、TPU膜和PET膜均能被汗液和护肤品污染，钢化玻璃膜污染后光学性能变化最小，抗污染性最好，PET膜光学变化最大，抗污染性能最差；3种材质的保护膜抗汗液污染性均优于抗护肤品污染性。     

高耐磨炭黑填充型粉末NR研究(Ⅱ)粒子形貌与成粉机理分析

在用凝聚共沉法制备高耐磨炭黑填充型粉末天然橡胶[P（NR／N330）]的基础上，用SEM研究了无接触污染性和有接触污染性的P（NR／N330）粒子的表面形貌，提出了用凝聚共沉法制备填充型粉末天然橡胶的成粉机理，指出选用时炭黑具有优良乳化作用的分散荆和合成具有优良成膜性的包覆荆，是制备无接触污染性的P（NR／N330）的技术关键。     

国外动态

橡胶助剂应向无害化发展橡胶助剂的无害化已成为当今橡胶助剂发展的一个重要方面。近年来国外非污染性防老剂的开发十分活跃，对苯二胺类防老剂已有了较好的代用品，便如尤尼劳尔公司的Ｄｕｒａｚｏｎｅ３７。许多国家对可产生致癌的亚硝胺的一类助剂极类为关注，有的已被...     

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。     

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。     

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。     

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     

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.     

分解炉扩径的技术改造

我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉