树脂复配对PVC增塑糊黏度及稳定性的影响

采用相同生产工艺、不同聚合度的两种树脂进行复配,研究各复配比例下聚氯乙烯增塑糊初始黏度以及黏度随时间的变化情况。结果表明,当高聚合度糊树脂PSH-10与低聚合度糊树脂CPM-31的配比为20/80时,糊黏度在各时间段最低;当PSH-10/CPM-31=50/50时,糊黏度稳定性最差;高聚合度糊树脂PSH-10基体中引入低聚合度糊树脂CPM-31（CPM-31含量小于50 %）时,对增塑糊黏度的影响要比低聚合度糊树脂CPM-31中引入高聚合度糊树脂PSH-10（PSH-10含量小于50 %）的影响明显;聚合度分布宽不利于增塑糊黏度稳定性。     

掺混树脂对PVC增塑糊性能的影响

研究了掺混树脂的用量对不同型号的PVC糊树脂发泡性能、黏度、力学性能、加工性能等的影响。结果表明:①对于发泡制品,掺混树脂的最佳替代比例为30%(质量分数);②加入掺混树脂可降低PVC增塑糊的黏度,且在放置时间为24h时黏度最大;③加入掺混树脂会降低PVC增塑糊的力学性能和加工性能。     

碳酸钙对PVC增塑糊黏度及稳定性的影响研究

采用振动黏度计系统研究了碳酸钙粒径大小、含量及颗粒形貌对环保聚氯乙烯（PVC）增塑糊黏度及稳定性的影响规律。结果表明,用4.5um碳酸钙配制的增塑糊初始黏度最大,且黏度稳定性最差;固定PVC树脂为100份时,随碳酸钙含量的增加,增塑糊的初始黏度增大,黏度稳定性降低;固定PVC和碳酸钙粉体总量为120份时,随碳酸钙含量的增加,增塑糊的初始黏度减小,黏度稳定性升高;用规则菱形碳酸钙配制的增塑糊黏度相对较小,用棉絮状碳酸钙配制的增塑糊黏度相对较大,且黏度稳定性最差。     

PVC增塑糊黏度及其稳定性正交实验研揪

采用L9(34)正交实验设计,研究PVC类型、填充剂粒径大小,硅油种类和用量多个因素对PVC增塑糊黏度及其稳定性的影响.实验结果表明:初级粒子粒径较大、表面较规则的微悬浮法糊树脂制得的增塑糊初始黏度最小,黏度稳定性较好;填充剂粒径大小与PVC增塑糊黏度成正比,粒径越大,糊初始黏度越大,粒径大小对糊的稳定性影响大致相同;100 mPa·s硅油体系下增塑糊初始黏度较低,50 mPa·s硅油体系下糊黏度稳定性较好;硅油加入0.6份时糊初始黏度较低,0.4份时糊黏度稳定性较好.     

不同生产方法糊树脂复配对PVC增塑糊黏度及稳定性的影响

采用相近聚合度、不同生产方法的两种树脂进行复配,研究各复配比例下增塑糊黏度及稳定性。结果表明：当微悬浮法糊树脂1与MSP-3法糊树脂2的配比为80/20时,糊黏度大且稳定性最差;当树脂1/树脂2 =50/50时,糊黏度较低,稳定性最好。树脂1中引入树脂2（含量小于50 %）使得体系黏度上升,黏度稳定性也变差,糊树脂颗粒形貌的影响比粒度分布的影响更大;树脂2中引入树脂1（含量小于50 %）可降低其黏度和提高黏度的稳定性,主要是糊树脂颗粒形貌和粒度分布优化的原因。     

PVC增塑糊黏度及其稳定性正交实验研究

采用L9（3^4）正交实验设计，研究PVC类型、填充剂粒径大小，硅油种类和用量多个因素对PVC增塑糊黏度及其稳定性的影响。实验结果表明：初级粒子粒径较大、表面较规则的微悬浮法糊树脂制得的增塑糊初始黏度最小，黏度稳定性较好；填充剂粒径大小与PVC增塑糊黏度成正比，粒径越大，糊初始黏度越大，粒径大小对糊的稳定性影响大致相同；100mPa·s硅油体系下增塑糊初始黏度较低，50mPa·s硅油体系下糊黏度稳定性较好；硅油加入0．6份时糊初始黏度较低，0．4份时糊黏度稳定性较好。     

掺混树脂的研究与开发

1 概述聚氯乙烯掺混树脂(简称掺混树脂)是一种在配制PVC增塑糊时通过掺混来代替部分糊树脂的PVC树脂。它被广泛用于人造革、壁纸、地板、钢板涂敷、搪塑制品、化学发泡、机械发泡等制品之中。它的主要作用是与糊树脂掺混后降低增塑糊的糊粘度。掺混树脂又可直接烧结制蓄电池隔板。由于掺混树脂能广泛应用于各种硬质、软质的糊树脂制品中,制品质量     

PVC糊树脂颗粒特性对增塑糊陈化行为的影响

选用5种不同牌号的PVC糊树脂制备出增塑糊,研究了PVC糊树脂的颗粒特性对增塑糊陈化行为的影响。结果表明:①小粒子可填充在大粒子之间,从而降低增塑剂的填充量,自由增塑剂更多,成糊后初始黏度较低;②与紧密型糊树脂相比,松散型糊树脂的增塑糊黏度稳定性更好;③分子质量越大,真实密度越大,增塑糊黏度稳定性越好;④对于紧密型糊树脂,低黏度的增塑糊在陈化过程中大粒子会发生沉降,导致糊中粒子分布不均一。     

PVC掺混树脂的研究、生产概述

PVC糊用掺混树脂是一种在配制PVC增塑糊时通过掺混来代替部分糊树脂的PVC树脂,它广泛用于壁纸、地板革、人造革、浸渍制品、注塑制品、搪塑制品的机械发泡、钢板涂层等制品中,不仅能改善糊制品的质量,而且能降低生产成本,提高经济效益。     

表面活性剂对PVC增塑糊稳定性能的影响及机理探讨

研究表面活性剂种类、用量对PVC增塑糊黏度稳定性的影响,并探讨增塑糊的稳定机理.结果表明:吐温类表面活性剂改性PVC糊初始黏度最大,350η硅油次之,聚氧乙烯类表面活性剂改性的增塑糊初始黏度最小,其中350η硅油改性的增塑糊黏度稳定性最好.随表面活性剂用量的增多,增塑糊的初始黏度越小,但增塑糊的稳定性与表面活性剂用量并不存在简单的线性关系.对有表面活性剂存在的PVC增塑糊,主要遵循空间位阻稳定机制和空位絮凝机制.     

树脂类型对PVC溶胶流变性能的影响

研究了不同生产方法糊树脂制备的聚氯乙烯（PVC）溶胶,在旋转流变仪程序升温模式下的流变性能。通过扫描电子显微镜、激光粒度仪和凝胶渗透色谱仪研究了PVC糊树脂的颗粒形貌、粒度及分布以及相对分子质量及相对分子质量分布特征,从而建立了PVC溶胶流变性能参数与糊树脂特性参数间的关系。结果表明,随着温度的升高,PVC溶胶的储能模量、损耗模量和复数黏度等流变参数呈非正态分布变化趋势,可分为4个阶段：前三阶段,流变参数先降低,后由缓慢升高至急速升高,形成一个肩峰并达到一个最大值,黏度变化趋势与树脂颗粒形态有关;第四阶段,流变参数逐步变小,黏度主要受树脂相对分子质量及相对分子质量分布的影响。     

The effect of blending resins on plastisol performance

Blending resins are well known by plastisol compounders as an economical substitute for PVC dispersion resin and as viscosity modifier. As dispersion resin supply tightens, interest grows in blending resins and how to choose the one that best fits the compounder's specifications. Eleven representative blending resins have been characterized, compounded into plastisols and screened for performance. A regression analysis and resulting contour plots have supplied a means of correlating resin molecular weight, particle size and surface area with plastisol, gel/fusion, and physical properties. The trends described in the contour plots allow the prediction of the best blending resin criteria for a specific application.     

Study on poly(vinyl chloride) paste blending resins

Polyvinyl chloride paste blending resins were prepared by a suspension polymerization process, and the optimum ingredients and technological conditions were studied experimentally. The effect of dispersant, surfactant, and agitator design on the particle morphology was discussed. In order to improve the thermal stability of the blending resin, stabilizer was added to the polymerization system, and a special after-treatment was adopted. The effect of blending resins on the rheological and gelation characteristics of the plastisols formed and on mechanical properties, thermal stability, and foamability of the finished articles is demonstrated.     

Formulation and mechanical characterization of PVC plastisols based on low‐toxicity additives

New formulations of plastisols based on low‐toxicity plasticizers were proposed and characterized. Traditional phthalate plasticizers were replaced in the plastisols studied in this research by polymeric plasticizers (i.e., saturated polyesters), produced by the reaction of a diol and a carboxylic acid. The main drawback for the use of these plasticizers in formulations of PVC plastisols is a significant increase of the paste viscosity, which decreases their processability; thus, the use of additional additives to reduce viscosity is recommended. This study also includes the optimization of the processing conditions (cure temperature and time) of the proposed plastisols: complete cure was obtained at 140°C and 10 min. It is reported that the final properties of plastisols are very sensitive with respect to the processing conditions; in fact, insufficient plasticization or degradation can affect the material when processed out of the optimum conditions. The influence of the plasticizer concentration on mechanical and optical properties, such as tensile strength, hardness, brightness, and the like, is also reported. In summary, the proposed plastisols, with low‐toxicity plasticizers, offer a valid alternative to traditional PVC plastisols based on phthalate plasticizers. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1881–1890, 2001     

Gelation and fusion profiles of PVC dispersion resins in plastisols

Poly(vinyl chloride) (PVC) plastisols are used for coatings, films, sheets, foams, and rotational castings. In order to satisfy the requirements for the different applications, a variety of PVC dispersion resins are manufactured. The requirements for the plastisols are many: for example, good air release, viscosity stability, fine particle size, foamability, and good heat stability. Processability is another important requirement, which emphasizes the rheological behavior at room temperature and the gelation—fusion behavior. This paper documents research to fingerprint the gelation and fusion profiles of various PVC dispersion resins. The viscoelastic measurements were used to continuously monitor the changes of moduli during gelation and fusion under a heating rate which simulates the temperature profile of the processes. The effects of molecular weight, resin type, and copolymer on the gelation–fusion behavior are discussed.     

PVC糊粘度影响因素的讨论

研究了PVC糊中部分主要组分对其糊粘度的影响，重点探讨了糊状PVC树脂种类、增塑剂的种类及用量、降粘剂的种类及用量等几大主要因素对PVC糊粘度的影响。实验结果表明，由于不同生产工艺使PVC糊树脂的初级粒子的粒径、粒子形态及粒子的分布形式不同，造成其成糊粘度及稳定性的差异。增塑剂的挥发性及溶剂化能力的差异会影响糊的粘度及稳定性。脂肪族烃类和可增塑类降粘剂的降粘机理的不同，会产生降粘效果的差异。     

降低聚氯乙烯糊树脂黏度的措施

对聚氯乙烯糊树脂黏度影响因素进行了分析,通过一系列生产试验,探讨了降低糊黏度的有效方法。