超低聚合度PVC糊树脂的开发研究

介绍了聚合度为600、K值为55的超低聚合度PVC糊树脂的开发过程,通过对链转移剂的筛选、加料方式、反应温度、引发体系及乳化体系的研究,成功地开发出混合法制备的超低聚合度PVC糊树脂新产品,目前该产品属国内空白。     

30 m~3聚合釜PVC生产工艺技改小结

<正>唐山三友氯碱有限责任公司(以下简称唐山三友)30 m~3聚合釜PVC生产采用的是悬浮法生产工艺,普通PVC树脂的生产流程主要包括涂釜、加料、反应、回收和出料,笔者主要对加料过程中引发剂、分散剂的加入方式和出料工序管线等进行工艺技术改造,以提高30 m~3聚合釜的生产能力及PVC树脂的质量。1 30 m~3聚合釜PVC生产原理及流程简介1.1工艺原理在悬浮法PVC生产工艺中,VCM液滴分散在水相中,     

超低聚合度PVC糊状树脂的开发研究

介绍了聚合度为600，K值为55的超低聚合度PVC糊状树脂的开发过程，通过对链转移剂的筛选、加料方式和反应温度及和乳化体系的研究，成功的开发出目前国内空白混合法超低聚合度的糊状树脂新产品。     

我国PVC树脂生产中电石加料阀密封结构的改进

针对我国电石乙炔法PVC树脂生产中电石加料阀中的橡胶密封圈易损坏,需要经常更换,因操作空间有限检修困难,存在安全隐患等问题,认为其密封结构不合理。参照家用压力锅的密封结构对电石加料阀进行了改进设计,并在宁夏120kt/a乙炔法制PVC装置中实施,因更换方便,提高了生产效率,深受操作人员欢迎,值得推广。     

PVC/NBR共混物的耐油性研究

考察了PVC树脂聚合度、NBR用量及混料时加料顺序对PVC/NBR共混物耐油性的影响。结果表明:使用高聚合度PVC树脂和NBR P83可明显改善共混物的耐油性。试验初步确定PVC/NBR输油管实验配方为:PVC(S-2500)100份,稳定剂1份,DOP 100份,NBR P83 20份,润滑剂0.5份。     

PVC树脂聚合生产中异常现象的讨论

我厂从1998年1月底到2月中旬,PVC树脂聚合生产中,出现了聚合釜顶部粘釜物增多及树脂干燥过程中加料困难、筛余物增多的异常现象。据了解,国内其它兄弟厂家也有类似情况发生,经过我们多方努力,已基本查明原因,现总结出来供大家讨论。     

软质PVC微孔发泡片材混合料高速混合工艺

以生产事实为依据，讨论了调整混合软质PVC微孔发泡片材混合料中树脂投放量、添加剂的加料顺序及混合时间等工艺条件的控制。     

我国PVC树脂差异化、高端化发展的研究和思考

对国内PVC树脂的发展现状进行了分析,介绍了一些传统的PVC特种树脂,如糊树脂、CPVC、氯醋树脂、消光树脂、少皮多孔PVC树脂、氯乙烯-丙烯酸酯共聚树脂等。提出了配混料和发展模式差异化等PVC产品差异化、高端化发展新思路,为PVC行业健康发展提供参考。     

特种聚氯乙烯树脂开发研究

本文介绍了高聚合度聚氯乙烯树脂、消光树脂及氯醚树脂等几种具有发展前景的特种PVC树脂的生产工艺及质量标准,以供国内PVC生产企业等参考。     

氯乙烯悬浮聚合几种加料方式的比较

前言 在聚氯乙烯树脂生产中,影响产品质量的因素是多方面的。加料方式的选择,是关系树脂质量的关键问题之一,同时采用合理的加料方式,就能用较少量或等量的原料生产出质量较好,数量多的合格产品,是有效利用资源,提高经济效益的一个重要途径。本文根据1983年进行的PVC16立升小釜实验数据,对各种加料方式进行了对比,找出了合理的又切实可行的加料方式。     

不可忽视的PVC树脂相关因素

论述了PVC树脂的外观与加工性能之间的关系,电石法PVC树脂不同批号间性能的差异性,PVC树脂颗粒形态与加工性能之间的关系,PVC树脂的"鱼眼"对型材表面质量的影响.     

Review of specialty PVC resins

World consumption of PVC was around 25 MM MT (55 billion pounds) in year 2001, second only to that of low density polyethylene. Only 10% of the PVC produced is classified as specialty PVC resins, while the other 90% is referred to as general purpose (GP) commodity resins. This paper tries to define what specialty PVC resins are, how they are produced, and their markets, applications, fabrication processes, and compounding as compared to those of GP resins.     

门窗用PVC型材对PVC树脂的要求

从门窗用PVC型材对PVC树脂的性能要求入手,简要分析了PVC树脂各项性能对PVC型材产品性能的影响,并就入厂检测情况提出了PVC型材厂家对PVC树脂的具体要求。     

改善PVC树脂流动性的措施

介绍了蒸汽加湿、添加抗静电剂、纯水雾化加湿等措施对PVC树脂流动性的改进效果,认为纯水雾化加湿能够很好地消除PVC树脂颗粒在长距离气流输送过程中产生的静电,能有效改善树脂颗粒的流动性,提高树脂的加工性能。     

电石法生产的PVC树脂中汞含量的测定

采用氢化物原子荧光光谱法测定了电石法生产PVC树脂中汞的含量,该方法回收率高,精密度好。在不同的加标水平下,其回收率为90.54%~96.88%,相应的RSD值均小于6%。该方法完全适用于电石法生产PVC树脂中汞残留量的测定。     

Review of PVC dispersion and blending resin products

The world consumption of PVC (2001) was around 25 MM MT (55 billion pounds), second only to low density polyethylene. Total PVC consumption in North America (2001) was 15 billion pounds. This represents almost 17% of all domestic plastics sales of 88 billion pounds. Dispersion and blending (extender) PVC resins are truly specialty resins, and they represent no more than 5% of the total PVC sales. This paper reviews the manufacturing processes, markets, plastisol/organosol compounding, applications, and technical challenges for the dispersion and blending resin industry. It also discusses some guidelines to help the formulator select the most cost‐effective resin package.     

聚合中加入可聚合非离子硼酸酯/甲基丙烯酸甲酯/纳米碳酸钙复合材料对PVC树脂力学性能的影响

制备了可聚合非离子硼酸酯(BE)/甲基丙烯酸甲酯(MMA)/纳米碳酸钙复合材料,生产出经其改性的PVC树脂,并按管材配方混料,分析了试样的力学性能;并考察了改性PVC树脂在管材中的应用情况。结果表明:①生产BE/MMA/纳米碳酸钙复合材料的最佳工艺配比为:m(BE)∶m(MMA)∶m(纳米碳酸钙)=2∶3∶95。②BE/MMA/纳米碳酸钙复合材料的质量分数为10%时,改性PVC树脂试样的简支梁冲击强度最高。③改性PVC树脂在管材中的应用情况良好,不仅可代替普通PVC树脂,还可降低生产成本。     

特种及专用PVC树脂的生产与应用

介绍了PVC糊树脂、聚偏氯乙烯、CPVC、高聚合度PVC树脂、消光PVC树脂、PVC掺混树脂及氯乙烯共聚树脂等几种具有发展前景的特种及专用PVC树脂,指出随着PVC行业的快速发展,加快PVC树脂及其下游产品的系列化、多元化、专用化及精细化是整个PVC行业应特别重视与亟待解决的问题。     

接枝共聚高抗冲PVC树脂的加工性能

将AIM增韧剂与普通PVC树脂、其他助剂共混制得了共混料;将AIM乳液与普通PVC树脂进行接枝共聚制得了高抗冲PVC树脂,再与其他助剂共混制得了接枝料;比较了二者的抗冲改性效果。结果表明:接枝料的抗冲改性效果更好。     

Particle features of poly(vinyl chloride) resins prepared by a new heterogeneous polymerization process

The heterogeneous polymerization of vinyl chloride monomer (VCM), with n‐butane as the reaction medium, was used to prepare poly(vinyl chloride) (PVC) resins. The particle features of the resulting resins and the particle formation mechanism of the polymerization process were investigated. The PVC resins prepared by the new polymerization process had a volume‐average particle size comparable to that of suspension PVC resins and a lower number‐average particle size. From scanning electron micrographs, it could be seen that the new PVC resins had a regular particle shape and a smooth surface with no obvious skin. They also had a high porosity. The new PVC resins were composed of individual and loosely aggregated primary particles. The diameter of the primary particles in the top layer of the grains was smaller than that of the primary particles in the center part of the grains. On the basis of the particle features of these PVC resins, a particle formation mechanism for the new polymerization process was proposed. PVC chains precipitate from a VCM/n‐butane mixed medium to form primary aggregates at a very low conversion, and the primary aggregates of the PVC chains aggregate to form primary particles, which further aggregate to form grains. The primary particles and grains grow by the capture of newly formed PVC chains and their primary aggregates and by polymerization occurring inside the aggregates. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 954–958, 2003