plasticizer compatibility of the polymer is good or bad in accordance with the trial and experience to determine

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  aluminium distearate 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 PVC window stabilizer  requirements and good electrical insulation. In addition to these requirements, the plasticizer should 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 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 vegetable stearic acid  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.