低温塑化型PVC塑溶胶用封端聚氨酯的研制

以异佛尔酮二异氰酸酯(IPDI)、聚己二酸丁二醇酯(PBA)和丙酮肟(DMKO)等为原料合成了封端聚氨酯(BPU),并以BPU作为附着力促进剂,加入到聚氯乙烯(PVC)增塑糊中,制备出一种低温塑化型车用PVC塑溶胶。研究了BPU对车用PVC塑溶胶的附着力、拉伸强度、断裂伸长率、剪切强度和耐过烘烤性能的影响。结果表明:加入适量的BPU后,可以明显提高车用PVC塑溶胶在电泳漆板上的附着力,使塑溶胶的塑化温度降低至120℃左右;经170℃烘烤后,塑溶胶仍保持较好的附着力且不黄变,其拉伸强度、断裂伸长率和剪切强度分别提高了62%、41%和57%。     

汽车用塑溶胶技术的发展趋势

介绍了各种类型的汽车用塑溶胶体温固化技术的进展，分析了传统的PVC塑溶胶的缺点及丙烯酸酯，聚氨酯塑溶胶的发展潜力。     

增塑PVC混合料组分分析

通过溶剂萃取、特性黏数测定并结合凝胶渗透色谱、傅里叶变换红外光谱和液相色谱等建立了增塑聚氯乙烯(PVC)混合料组分的分析方法,对不同配方组成的增塑PVC混合料进行剖析。该方法能基本确定增塑PVC混合料中PVC树脂的型号、增塑剂的种类及含量、填料的含量等信息。     

提高PVC塑溶胶粘合力研究

ＰＶＣ塑溶胶配制的密封胶具有单组分、无溶剂、贮存稳定及弹性好、耐化学介质优良等特点、缺点是粘合力差。本文介绍了环氧树脂、聚氨酯树脂、聚酰胺树脂、丙烯酸树脂、尿素树脂等对ＰＶＣ塑溶胶的增粘作用,论述探讨了增粘剂的结构特点和增粘机理,以及油面胶的配制。     

增塑剂对旋转模塑用PVC增塑糊性能的影响

作者对增塑剂种类及用量与旋转模塑用PVC增塑糊性能的关系进行了较为深入的研究,从而为旋转模塑用PVC增塑糊中增塑剂种类及用量的确定提供了有益的参考。     

增塑剂对旋转模塑用PVC增塑糊性能的影响

通过增塑剂种类及用量对旋转模塑用聚氯乙烯(PVC)增塑糊粘度及其粘度稳定性、脱气性能、凝胶化性能的影响及温度对凝胶化性能的影响进行了研究。结果表明:选择自身粘度较小且溶剂化能力较弱的增塑剂及随增塑剂用量增加,PVC增塑糊粘度下降、粘度稳定性逐渐变好,有利于PVC增塑糊的排气性能提高,延长PVC增塑糊的凝胶化时间。通过调节加热温度及时间可在一定范围内有效控制凝胶化过程,以期获得制品所需性能。     

新型医用环保无毒增塑剂增塑PVC性能对比

选用的2种增塑剂环己烷-1,2-二羧酸二异辛酯(DEHCH)与环己烷-1,2-二羧酸二异壬酯(DINCH)为国际公认的环保无毒增塑剂,对2种增塑剂增塑PVC的力学性能、低温性能、光学性能、稳定性能等方面做了全面的对比。结果表明:环保增塑剂DEHCH增塑PVC在力学性能方面要优于DINCH增塑的PVC;环保增塑剂DEHCH增塑PVC在光学性能方面要略差于DINCH增塑的PVC。     

PVC增塑溶胶热分解时增塑剂的反应

据《P．D．S．》1996，53（2），261～268报导，西班牙学者研究了PVC增塑溶胶热分解时增塑剂和树脂类型不同对反应过程的影响。采用了不同溶解能力的8种增塑剂，10种商品树脂。在热重分析中，增塑溶胶的热重曲线形状受配方组份的性能影响很大。增塑剂在溶胶中的挥发比其单独存在时缓慢。树脂的分解温度则表现出处于溶胶状态时较低，树脂单独存在时较高。上述两种影响还会由于增塑剂与树脂之间的相容性越好而越显著。对于相容性较好的增塑剂，可观察到微分曲线上树脂相应的峰分别出现两个差热峰。文章从树脂与增塑剂互相作用的情况作了解…     

微悬浮法PVC增塑溶胶凝胶化和熔化特性的研究

用HAAKE转矩流变仪测定了微悬浮法聚氯乙烯(PVC)增塑溶胶的凝胶化和熔化特性,探讨了树脂品级、增塑剂类型和混合树脂对凝胶化和熔化速率的影响。实验还表明,单丝的拉伸强度和相对伸长率与它的加工温度、形态和熔化程度有密切的关系。     

碳酸钙用量对旋转模塑用PVC增塑糊性能的影响

本文通过碳酸钙用量对旋转模塑用PVC增塑糊性能的影响进行较为深入的研究 ,从而为旋转模塑用PVC增塑糊中CaCO3用量的确定提供了有益的参考。     

聚氯乙烯糊树脂对旋转模塑用增塑糊性能的影响

较为深入地研究了ＰＶＣ糊树脂种类对旋转模塑用ＰＶＣ增塑糊性能的影响,从而为旋转模塑用ＰＶＣ增塑糊中糊树脂种类的确定提供了有益的参考。     

表面活性剂对旋转模塑用PVC增塑糊性能的影响

通过表面活性剂种类及用量对旋转模塑用ＰＶＣ增塑糊性能的影响进行较为深入的研究，从而为旋转模塑用ＰＶＣ增塑糊中表面活性剂种类及用量的确定提供了有益的参考     

旋转模塑用聚氯乙烯增塑糊的研究

对影响ＰＶＣ增塑糊性能的五个因素：ＰＶＣ增塑糊的流变性能、糊粘度稳定性、脱气性能、凝胶化性能和塑化性能进行较为深入的研究；为确定ＰＶＣ增塑糊所用主要原料的种类和用量提供了有益的参考。     

Length and port size effects on Combustion of PVC Plastisol Hybrid Fuel

The combustion behaviour of a cylindrical port burning PVC plastisol hybrid fuel grain in an oxidizing stream of gaseous oxygen has been studied and the effects of grain length and port size on the local regression rate, average regression rate and mass consumption rate have been investigated. Various combinations of grain length and port size have been employed to give a wide range of L/D ratios from 8 to 100. The average regression rate is found to increase with the increase of L/D ratio, whereas the mass consumption rate is found to decrease with the increase of L/D ratio. An attempt has also been made to correlate the fuel mass consumption rate with the Reynolds' number and the total mass flux.     

Influences of contents and molecular weights of LDPE on DOP plasticization of PVC

Influences of contents and molecular weights of low‐density polyethylene (LDPE) on dioctyl phthalate (DOP) plasticization in the poly(vinyl chloride) (PVC) plastisol (PVC/DOP/AO = 100/30/6.5) were investigated using DMA and DSC. The plasticization effects of DOP on the PVC plastisol were found to decrease with increasing LDPE content. A negligible plasticization effect of DOP on the PVC plastisol was found when the LDPE content was equal to or higher than 75 parts per 100 parts by weight of LDPE and PVC together. Based on thermal fractionation experiments, a favorable interaction between LDPE and DOP was developed during melt blending of LDPE and the PVC plastisol. The present interaction enabled the incorporation of DOP into LDPE and decreased the plasticization effects of DOP on the PVC plastisol. A further decrease in the plasticization effects of DOP on the PVC plastisol by the presence of LDPE was found with increasing LDPE molecular weights. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2548–2555, 2002     

Processing conditions optimization for PVC plastisol rotational molding

In this work we present the optimization of the processing conditions for PVC plastisol rotational molding. The effects of oven temperature, processing time, rotational, speed and amount of plastisol over the degree of curing, physical appearance, and mechanical properties of the molded articles were studied. Also, using a simple mathematical model to simulate the temperature profiles of the plastisol inside of the spherical mold as a function of time, the viscosity change of the plastisol with time is reported. A rotational molding machine laboratory size was used for the experiments. The oven (at different points) as well as the mold (at the inside and outside of the cavity) temperatures were measured as a function of time in order to get a better understanding of the curing process. Such data in conjunction with the model gives the support for process optimization and control.     

聚氯乙烯塑溶胶的"湿碰湿"技术

介绍了国外聚氯乙烯塑溶胶的“湿碰湿”技术,即在前一道涂层未经烘干的状态下直接进入下一道涂装工序,减少了烘烤的次数,并确保了各道涂装工序的质量与效果。