A wide variety of PVC plasticisers

In the processing of PVC , the plasticizer used in applications with various additives to the largest , so it is much higher than other additives investment , even in some formulations softer material than the main raw material of vinyl chloride resin investments. Therefore, the importance of a plasticizer selected without saying lose.
The choice of plasticizers
 PVC is a highly polar polymer , a great intermolecular force , to be heated to a certain temperature in order to show plastic lubricant  the plastic . PVC strong intermolecular forces to make products become hard and inflexible and flexibility. The role of a plasticizer PVC to weaken the force between molecules , thereby reducing the softening temperature , reducing the melt viscosity , increase mobility and improve the processing properties of PVC and products of flexibility.
Less volatile plasticizer is usually a high boiling ester , a few are a low melting solid , they do not generally react with PVC . Conditions of use of plasticizers with the resin has good compatibility , low price, high plasticization efficiency , plasticized speed, durability ( low volatility Yi shift is small, high extraction resistance ) , environmental stability good ( light, heat resistance, bacterial resistance, chemical resistance and flame retardant ) , health is good ( to people, livestock and crops, non-toxic, non- polluting , tasteless ) , electrical insulation , good viscosity stability is good. However, a plasticizer does not satisfy all the conditions . In actual use , the majority is composed of two or more and for each other, to get the best plasticizing effect and achieve perfect performance requirements. Plasticizer in a formulation used to make the products have reached the optimum value of all the performance is impossible, therefore , to ensure that the choice of plasticizer when the first major performance requirements. Such as children's toys and food packaging and other requirements are mainly non-toxic , beautiful appearance ; plastic sheeting requirements harmless to crops , light , heat ; wire and cable materials are the main requirements and good electrical insulation . In addition to these requirements, the plasticizer should vegetable stearic acid  also focus on the selection of the following factors : PVC resin performance ; product performance required ; plasticizer processing adaptability , cost . Consider the performance of the plasticizer itself , compatibility of the plasticizer most important, it is a plasticizer selected fundamental factors must be considered . Plasticizer and resin compatibility, then plasticized high efficiency , plasticizers no segregation, no exudation , product flexibility and long service life . In the production practice , plasticizers in polymers mainly based on the compatibility with the test quality and experience antimony flame retardant  to determine. Compatibility evaluation method is simple plasticizers, resins , and a suitable solvent by mixing , to prepare a homogeneous solution was slowly cast into a film , its transparency is observed to judge. Homogeneous transparent film represents good compatibility , fuzzy means poor compatibility . Another method plasticizer PVC resin by mixing uniformly heated to plasticizing was cooled to room temperature, and observe any signs of exudate. No description plasticizer exudation good compatibility , oozing plasticizer compatibility explained more worse . According to a general rule, the more similar the easier it immiscible polar . Thus , the solubility parameter of the plasticizer and resin solubility parameter closer . Both compatibility as possible. Dielectric constant is a function of molecular polarity , dipole moment , and it is subject to great influence of hydrogen bonds . Determine the dielectric constant can be used as a plasticizer compatibility parameter. According to the solubility parameter of PVC , plasticizers generally used 8.4-11.4 solubility parameter , dielectric constant of 4-8.