Epoxy Based Thermal Stabilizer for Poly(Vinylchloride)

Abstract

A tetrafunctional epoxy resin was prepared and characterized by epoxy equivalent weight, percentage nitrogen, IR spectroscopy and number average molecular weight (Mn) determined by GPC. The resin was evaluated as a thermal stabilizer for polyvinylchloride (PVC). The stabilizing efficiency was tested by yellowness index, HCl liberation, UV absorption, induction time, and changes in mechanical properties (tensile strength, elongation at break and Shore-A hardness). Epoxy resins with several epoxy groups are effective as in stabilizing PVC against dehydrochlorination during processing and use, compared with tribasic lead sulphate. The replacement of lead based stabilizers by epoxy stabilizers will remove the toxic effect of lead in water flowing through PVC pipes.

The Effect of Epoxidized Safflower Oil on the Properties of Polyvinyl Chloride Films

“…With the inclusion of epoxy groups, this plasticizer should also have the added advantage of being a heat stabilizer. Previous studies have shown that epoxides are effective PVC thermal stabilizers [17]. The use of ECTO not only has the potential to reduce the production of DEHP but may also minimize the manufacture of heat stabilizers, chemicals that are often hazardous to the environment.…”

Viability of use of PVC tubes in solar collectors: an analysis of materials

“…In order to evaluate the behavior of the PVC tubes exposed to long periods of solar radiation, and which the property alterations in relation to the tube never exposed, some compared properties had been determined and soon after calculated parameters (δ) that relates the property of the sample in the study to the properties of the standard sample. Tests of traction, compression, bend and impact, in the five samples of the each type studied, were carried out, to analyze the waste levels associated to the thermal and UV degradations and evaluate its causes and effects [1][2][3][4][5][22][23][24][25][26][27][28][29][30][31][32] . The comparative parameters (δ) they are calculated in agreement with the Eq.…”

“…Specialized literature shows that the susceptibility to the thermal degradation of PVC reaches a critical level from temperature above 60 °C in its surface. The UV degradation also represents a restriction to the use of solar collectors made of PVC tubes, once radiations with this wavelength affect the mechanical integrity of this kind of material [1][2][3][4][5][6] .…”

Epoxy Resins

“…303 Lead-based stabilizers for polyvinyl chloride are mostly banned and only allowed for a few applications.…”