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In the production process of PVC products, a certain amount of gas is often volatilized, and sometimes there is a relatively heavy taste. These gases have a certain degree of damage to the human body, and metals and plastic products that have been in such an environment for a long time will be shortened due to erosion.
What kind of substances are these volatiles? A brief analysis is given below. First, the volatiles are water and low molecular organic substances that evaporate from the matrix material after the processing temperature exceeds its boiling point. Low molecular substances may include vinyl chloride, dichloroethane, dichloroethylene, vinylidene chloride, trichloroethane, acetylene, acetaldehyde, and some low molecular substances produced by the decomposition of PVC. Of course, the content of these substances will be very low. Even close to zero. Secondly, it is the main product of PVC decomposition, hydrogen chloride, which will appear as a gas in the processing environment and will evaporate. Finally, there are volatile substances in the auxiliaries themselves, impurities or reactants (such as reacting with hydrogen chloride to form new compounds).
Regarding the odor, in addition to the sour taste of hydrogen chloride, it is more related to the additives selected in the formula. Some additives such as plasticizers and organotin stabilizers have a special taste, but are not heavy. If some special additives are added to the formulation, such as cresotriyl phosphate, a flame retardant plasticizer, there will be a heavy taste during processing.
In addition, some manufacturers use low-grade additives to reduce costs, such as the use of distillate as a plasticizer, but also cause unpleasant odor due to composition, purity or impurities. The same problem exists with the recycling of waste plastics.
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