不饱和聚酯基纳米复合材料研究进展

综述了纳米粒子填充型以及有机蒙脱土插层型不饱和聚酯基纳米复合材料的国内外研究进展,详细介绍了不饱和聚酯纳米复合材料的制备方法、性能影响因素、改性效果等。     

不饱和聚酯片状模塑料的研究

采用聚氨酯预聚物作增稠剂对带端羟基的不饱和聚酯进行增稠,制备出一种新型的不饱和聚酯片状模塑料(SMC),并研究了其增稠性能、增韧性能及贮存稳定性。结果表明,增稠剂PU400的用量要控制在8％～10％,否则树脂糊无法正常浸渍玻璃纤维;不饱和聚酯SMC的体积收缩率随PU400加入量的增加而明显变小;当PU400含量为36％,时,不饱和聚酯SMC固化物的拉伸强度、断裂伸长率、冲击强度都维持在一个较高的水平;该不饱和聚酯SMC有良好的贮存稳定性。     

玻纤增强不饱和聚酯片状模塑料(SMC)制备及制品成型工艺

本文叙述了玻纤增强不饱和聚酯模塑料SMC制造配方、设备、复合及增稠等制备工艺,还阐述了SMC压塑成型三要素及制品性能。     

第47届(1992)SPI学术年会论文题录

第1部分 SMC/BMC:基础研究(Ⅰ) 1—A 影响表面平滑度的因素及不饱和聚酯和玻璃纤维的作用 1—B SMC模塑件中针孔主要成因的研究 1—C 优化SMC工艺条件改善产品表面质量 1—D 不饱和聚酯混合物的低收缩机理研     

不饱和聚酯／活性橡胶／蒙脱土纳米复合材料及其制备方法

本发明是一种不饱和聚酯／活性橡胶／蒙脱土纳米复合材料及其制备方法,它是在不饱和聚酯中加入经改性的蒙脱土和具有反应性的活性橡胶,然后在室温下进行固化反应,通过共聚和交联反应形成整体网络结构,并与蒙脱土形成插层纳米复合,从而获得增强,增韧及提高热稳定性的协同效应,实现不饱和聚酯及其复合材料的高性能化。     

有机累托石改性不饱和聚酯／玻璃纤维复合材料的研究

采用有机累托石改性不饱和聚酯，以改性的不饱和聚酯为基体，以两种玻璃布(EW210、CWR400-90)为增强材料，以两个不同凝胶时间的不饱和聚酯树脂体系制备三种有机累托石改性的不饱和聚酯磁璃纤维复合材料(UPB1、UPB2、UPB3)。测试了不饱和聚酯/玻璃纤维的力学性能；研究了复合材料的耐湿热性及耐介质性能；利用扫描电镜及透射电镜分析了复合材料的增强机理。结果表明，采用有机累托石改性不饱和聚酯所制备的不饱和聚酯／玻璃纤维复合材料的综合力学性能优于纯不饱和聚酯／玻璃纤维复合材料。     

中国不饱和聚酯工业进展

综述了最近中国不饱和聚酯(UPR)及其原料的生产、供应、消费和产能扩充情况。介绍了不饱和聚酯技术发展动态,其中包括利用可再生资源及废弃物为原料制备新型不饱和聚酯或其复合材料,以及在提高不饱和聚酯阻燃性、耐腐蚀性,降低收缩率等方面的研究进展及其增强材料的应用进展。     

聚酯预浸料复合SMC工艺及其应用

对以SMC为基础,添加以不饱和聚酯预浸材料作为加强层,形成的复合SMC材料进行了研究,介绍了采用的工艺流程和成型方法;以0.4mm的无碱玻璃布作为加强层增强材料,制作预浸布,以1∶1的体积比与SMC材料复合,采用复合SMC工艺成型的制品机械性能与常规SMC和采用聚酯作为树脂基体的RTM制品性能比较,拉伸强度达到180MPa,弯曲强度达到262MPa,冲击强度达到246kJ/m2,性能优势明显。     

PF—SMC的性能、成型方法及其应用

PF—SMC(酚醛树脂片状模塑料)具有与UP—SMC(不饱和聚酯片状模塑料)基本相同的机械性能。但PF—SMC受热下的机械性能、阻燃和热稳定性更优于UP—SMC,已被广泛地应用于宇航、建筑、运输业等领域。     

玻纤增强UP基复合材料大巴空调罩力学性能

通过采用玻纤质量分数为18％,23％,29％的片状模塑料(SMC)材料,在成型压力为10000,12000,17000 kN的条件下,制备了大巴空调罩制件并进行力学性能测试,研究了成型压力、玻纤含量对玻纤增强的不饱和聚酯基复合材料盒型件的拉伸性能和冲击性能的影响,为制品生产时原料选择及工艺参数确定提供参考.结果表明,在...     

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。     

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。     

三种煤样燃烧热的测定

本文通过三个厂家提供的三种煤样燃烧热的测定,由测定结果综合得出3号煤样燃烧最完全、燃烧热也最大,是三个煤样中最好的一种。     

Semi-empirical equation of state of metals. Equation of state of aluminum

A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO₂) of density 0.08 g/cm³. __________ Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008.     

水泥水化热测定方法综述

水泥水化热是中、低热水泥和核电工程用水泥的一项关键的技术指标。全球范围内测定水泥水化热的方法有溶解法、直接法/半绝热法、等温传导量热法三种。本文总结了中、美、欧相关方法标准,对其测试原理、仪器设备、试验过程等方面进行了比对,并对其在领域的应用做了简单的概括。     

Calorimetric and Computational Study of Enthalpy of Formation of Diperoxide of Cyclohexanone

A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out.     

我国聚碳酸酯工业发展概况

介绍我国聚碳酸酯生产能力和消费需求,对聚碳酸酯在信息工业中的应用作了简短介绍     

小议汽车涂装工艺设计对涂装成本的影响

论述了涂装工艺设计对涂装设备投资、涂装生产成本的影响。     

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     

Measurement of the gradient of viscosity with composition of mixtures of non-ideal gases

A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%.