scholarly journals A novel evaluation method for dehydrochlorination of plasticized Poly(vinyl chloride) containing heavy metal‐free thermal stabilizing synergistic agent

2021 ◽  
Author(s):  
Ali I. Al‐Mosawi
Keyword(s):  
Heavy Metal ◽  
Vinyl Chloride ◽  
Evaluation Method ◽  
Metal Free ◽  
Poly Vinyl Chloride ◽  
Synergistic Agent

scholarly journals A new generation of cable grade poly(vinyl chloride) containing heavy metal free modifier

2021 ◽  
Vol 29 (1) ◽  
Author(s):  
Ali I.Al-Mosawi
Keyword(s):  
Heavy Metal ◽  
Vinyl Chloride ◽  
Thermal Gradient ◽  
Volume Resistivity ◽  
Capillary Rheometry ◽  
Limiting Oxygen Index ◽  
Metal Free ◽  
Extrusion Processing ◽  
Poly Vinyl Chloride ◽  
New Generation

AbstractMany additives are used to improve the performance of cables in terms of increasing their flame retardancy, thermal stability, thermal conductivity, and other characteristics. Unfortunately, most of these additives contain heavy metals. Therefore, the main objective of this study is to introduce a material representing a new generation of environmentally friendly heavy metal-free stabilizers for cable grade poly(vinyl chloride) that can compete with traditional materials in terms of performance and distinctive properties. This unique additive is Oxydtron, a synthetic silicate or simply nanocement. The tests performed are rheological properties represented by a capillary rheometry analysis, limiting oxygen index, and volume resistivity. The most significant improvement in Bagley correction measurements was 14.61%; 18.13%; and 27.20% more than poly(vinyl chloride) basic formulation when using 5wt.% Oxydtron at 160 °C, 170 °C, and 180 °C, respectively. Also, the mean increases in relaxation time were 3.200 times, 8.825 times, and 12.458 times more than poly(vinyl chloride) basic formulation with 1wt.%, 3wt.%, and 5wt.% of Oxydtron, respectively. Furthermore, the Oxydtron lowered the value of the accompanying thermal gradient of the L.O.I test, reducing the heat-affected zone. The best result was with the extrusion processing method due to the uniformity of the processing conditions. However, the thermal gradient analysis showed residual heat stress in the test samples after cutting the burning layer and re-testing the samples again; this causes them to burn faster. This situation requires caution for designs that are exposed to high temperatures without burning. The optimum improvement in volume resistivity value was 14.71% and 38.24% more than poly(vinyl chloride) basic formulation after adding 5wt.% and 7wt.% of Oxydtron, respectively.

The effect of (natural) polyols on the initial colour of heavy metal- and zinc-free poly(vinyl chloride)

2006 ◽  
Vol 91 (9) ◽  
pp. 2233-2240 ◽  
Author(s):  
Johan Steenwijk ◽  
Daan S. van Es ◽  
Jacco van Haveren ◽  
John W. Geus ◽  
Leonardus W. Jenneskens
Keyword(s):  
Heavy Metal ◽  
Vinyl Chloride ◽  
Poly Vinyl Chloride

The compatibility of (natural) polyols with heavy metal- and zinc-free poly(vinyl chloride): Their effect on rheology and implications for plate-out

2008 ◽  
Vol 93 (1) ◽  
pp. 50-58 ◽  
Author(s):  
Daan S. van Es ◽  
Johan Steenwijk ◽  
Guus E. Frissen ◽  
Hans C. van der Kolk ◽  
Jacco van Haveren ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Vinyl Chloride ◽  
Poly Vinyl Chloride

scholarly journals The synergism of MgCO3 and 2ZnCO3·3ZnO·4H2O as flame retardants and smoke suppressants for flexible poly(vinyl chloride) (PVC)

e-Polymers ◽  
2011 ◽  
Vol 11 (1) ◽  
Author(s):  
Hongqiang Qu ◽  
Weihong Wu ◽  
Yunhong Jiao ◽  
Jixing Xie ◽  
Jianzhong Xu
Keyword(s):  
Vinyl Chloride ◽  
Flame Retardants ◽  
Decomposition Temperature ◽  
Char Residue ◽  
Initial Decomposition Temperature ◽  
Limiting Oxygen Index ◽  
Second Stage ◽  
Poly Vinyl Chloride ◽  
The Stability ◽  
Synergistic Agent

AbstractMgCO3 and 2ZnCO3·3ZnO·4H2O (AZC) as flame-retardants and smoke suppressants for flexible poly(vinyl chloride) (PVC) was evaluated using limiting oxygen index (LOI), smoke density rating (SDR) tests, scanning electron microscopy (SEM) and thermogravimetry analysis (TGA). The activation energy (Ea) of the original and flame retardant PVCs’ degradation processes was calculated by the Vyazovkin method. The results showed that the AZC can be used as a synergistic agent for MgCO3 as flame retardants agent of flexible PVC. The composites of MgCO3 and AZC cannot only decrease the initial decomposition temperature and increase the weight loss rate in the first stage, but also can promote the char formation in the second stage. The AZC decreased the Ea of the degradation reaction of PVC in the first stage and MgCO3 increased the Ea in the second stage, which means that the AZC combined with MgCO3, catalyzed the dehydrochlorination, promoted the early crosslinking for the PVC compound and improve the stability of the char residue. The SEM results also show that the char residue of MgCO3/AZC treated sample has a continuous and denser structure, which can be used as a barrier for the PVC bulk.

scholarly journals Long-term heat stabilisation by (natural) polyols in heavy metal- and zinc-free poly(vinyl chloride)

2006 ◽  
Vol 91 (1) ◽  
pp. 52-59 ◽  
Author(s):  
Johan Steenwijk ◽  
Rik Langerock ◽  
Daan S. van Es ◽  
Jacco van Haveren ◽  
John W. Geus ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Vinyl Chloride ◽  
Poly Vinyl Chloride ◽  
Heat Stabilisation
Sign in / Sign up

Export Citation Format

Share Document