稀土无机盐对聚氯乙烯热稳定作用的研究

本文着重研究了不同品种、不同组分配比的稀土无机化合物及其与稀土有机盐复合对聚氯乙烯热稳定性的影响，并对其作用机理进行了初步探讨。     

稀土热稳定剂对聚氯乙烯热稳定性能的影响

本文研究了稀土热稳定剂对聚氯乙烯热稳定性能的影响,并对其热稳定机理进行了探讨。     

稀土热稳定剂在聚氯乙烯塑料中的应用前景

本文对稀土热稳定剂的发展、应用、特点、稳定机理以及发展前景做了详尽的综述。确定烯土化合物是一种可以替代传统热稳定剂的新型热稳定剂。该稳定剂无毒、价廉、稳定效果好、制品性能优异，具有广阔的应用前景。     

聚氯乙烯塑料稀土稳定剂的研究开发现状和发展趋势

热稳定剂是聚氯乙烯塑料(PVC)加工中的重要助剂,目前世界各国仍以传统的重金属类热稳定剂为主。未来热稳定剂行业的主要发展趋势是高效、低毒、复合型、无污染,重金属类稳定剂将逐渐被新型环保热稳定剂淘汰。稀土稳定剂作为我国独有的一类热稳定剂,具有热稳定性好、无毒、无污染等许多优点,同时我国具有丰富的稀土资源,因此大力发展稀土热稳定剂是我国热稳定剂行业发展的主要方向。     

PVC稀土热稳定剂的研究进展及发展趋势

稀土化合物作为PVC热稳定剂具有优异的热稳定性和良好的耐候性,无毒环保,且和其他热稳定剂有协同作用。本文介绍了聚氯乙烯(PVC)稀土热稳定剂的合成现状,作用机理,及应用进展,并指出其今后的发展前景。     

稀土高分子材料助剂开发研究进展

最近30年的研究已显示稀土化合物在改进高分子材料加工和应用性能以及赋予高分子材料新功能等方面均具有独特的功效。本文综述了稀土高分子材料助剂的开发和研究进展。     

硬脂酸稀土用作无毒聚氯乙烯热稳定剂的研究

本文综述硬脂酸稀土用作无毒聚氯乙烯热稳定剂的研究。根据已发表的研究结果，硬脂酸稀土是一种兼具润滑剂、加工助剂以及光稳定剂作用的无毒透明长期型聚氯乙烯热稳定剂     

电感耦合等离子体质谱法测定聚氯乙烯加工用稀土复合热稳定剂中铅

稀土复合热稳定剂中含有有机化合物,为确保试样溶解完全,实验采用先灼烧再用混合酸消解的方法对试样进行前处理。实验表明,采用马弗炉于600℃灼烧30min,试样可变为灰白色,再用硝酸-氢氟酸-高氯酸进行消解,以2%(V/V)硝酸为测定介质,以²⁰⁸Pb作为测定同位素,可实现电感耦合等离子体质谱法(ICP-MS)对聚氯乙烯加工用稀土复合热稳定剂中铅的测定。采用10.00ng/mL铊为内标校正基体效应和信号漂移;在0.50~25.00ng/mL的质量浓度范围内,以铅质量浓度为横坐标,铅与铊内标信号强度的比值为纵坐标绘制校准曲线,其相关系数大于0.9995。方法检出限为0.06ng/mL,方法测定下限为0.19ng/mL。采用实验方法测定两个聚氯乙烯加工用稀土复合热稳定剂试样中铅的含量,其质量分数分别为1.70和1.20μg/g,其相对标准偏差(n=11)小于10%,加标回收率为96%~105%。     

PVC塑料稀土复合热稳定剂的研制

本文制备了柠檬酸稀土、月桂酸稀土、硬脂酸稀土和苹果酸稀土,对各稀土产品进行了热稳定性研究,发现苹果酸稀土的热稳定性最好,其长期热稳定性与有机锡相当。并用苹果酸稀土与硬脂酸锌进行复配,发现具有很好的协同效应。     

稀土对聚氯乙烯塑料降解的共轭作用的光声光谱研究

通过对稀土作用下PVC降解的光声光谱研究,分析了在稀土作用下PVC降解的共轭分布情况,结果表明,稀土PVC热稳定剂具有良好稳定性和初色性能。     

PVC稀土热稳定剂的性能特征及发展趋势

稀土类稳定剂作为新型发展起来的无毒热稳定剂,热稳定性和持久性均较好,且无毒、环保、价廉,适应当今PVC制品无毒、无污染、高效的发展要求。为此,介绍了稀土热稳定剂的性能特点及发展趋势。     

Development Status and Research Progress in Rare Earth Hydrometallurgy in China

Characteristic and hydrometallurgy processes for Baotou mixed-type rare earth concentrate, bastnasite, and ionic adsorption deposit in China were reviewed. The R ＆ D circumstance and new progresses in extraction and separation of RE element in China were introduced. Moreover, the development trend of RE hydrometallurgy was predicted. The direction and emphasised fields of research and development are also brought forward as： to R ＆ D high efficient green progresses in hydrometallurgy and separation of RE ore, resolve the waste pollution problem of water, slagand gas, reduce the chemical material consumption and improve comprehensive efficiency of resources; to R ＆ D preparation technology for RE compounds with ultra high-purity and special physical property for extending application fields of RE.     

Study on Preparation and Properties of PVC Film Modified by Rare Earth

The transparent PVC films were prepared by tape casting. In the process of preparation, rare earth nitrate, as a kind of modifier, was added to the solution of PVC and THF. These PVC films were tested after being crosslinked by ultraviolet light. It is found that the mechanical and physical properties of all the PVC films modified by rare earth nitrate are greatly enhanced.     

Study on Mechanism of Rare Earth PVC Stabilizer

Rare earth compounds can be used as PVC thermal stabilizers. According to the infrared spectra of the mixture of PVC and some stearates, the mechanism of stabilization of different stearates was studied. The specialty of rare earth stabilizers was found. They can change the conformation of PVC and restrain the elimination of HCI. From this aspect, the unique synergetic effect with other stabilizers of rare earth compounds can be explained.     

Effect of Rare Earth Additives on Chrome-Plating Quality

Electroplatingisoneofthetraditionalprocessesof decorationandsurfaceprotection.Boththeelectroplate principleandprocessparameterscanformacomplete setofsystem.However,therestillexistsixmostseri ousproblemssuchasthepoorcombinationstrengthof electroplatecoatin…     

PVC稀土热稳定剂的性能特征以及发展趋势

稀土类稳定剂作为新型发展起来的无毒热稳定剂,热稳定性和持久性均较好,且无毒、环保、价廉、适应当今PVC制品无毒、无污染、高效的发展要求。文中介绍了稀土热稳定剂的性能特点,功能性以及发展趋势。