TY - JOUR
T1 - Synthesis of pentaerythritol stearate ester-based zinc alkoxide and its synergistic effect with calcium stearate and zinc stearate on PVC thermal stability
AU - Liu, Hao
AU - Li, Degang
AU - Li, Ruijiao
AU - Sun, Hongqi
AU - Zhang, Yali
AU - Zhang, Lipeng
AU - Zhao, Pingping
N1 - Funding Information:
Correspondence to: D. Li; e-mail: [email protected] or H. Sun; e-mail: h. [email protected] Contract grant sponsor: University Research Program of Shandong Provincial Department of Education; contract grant number: J16LC24. Contract grant sponsor: SDUT & Zibo City Integration Development Project; contract grant number: 2016ZBXC057. Contract grant sponsor: National Natural Science Foundation of China; contract grant number: 51574160 and 21506118. Contract grant sponsor: Shandong Province National Natural Science Foundation; contract grant number: ZR2014EEM049. DOI 10.1002/vnl.21602 Published online in Wiley Online Library (wileyonlinelibrary.com). VC 2017 Society of Plastics Engineers
Publisher Copyright:
© 2017 Society of Plastics Engineers
PY - 2018/11
Y1 - 2018/11
N2 - A novel pentaerythritol stearate ester-based zinc alkoxide (PSE-Zn) was synthesized through a two-step method. Zinc ethoxide was first prepared from zinc acetate and ethanol, and then with ethanol as the solvent, the obtained zinc ethoxide ester was heated together with pentaerythritol stearate to produce PSE-Zn. PSE-Zn could be used as a promising poly(vinyl chloride) (PVC) thermal stabilizer. Conductivity tests, thermal aging tests, and UV-visible spectroscopy were used to study the thermal stabilization performance of the thermal stabilizers of PSE-Zn on PVC. The results showed that, with a lower melting point and a good compatibility with PVC, PSE-Zn presented a significant improvement in maintaining the initial color of PVC. However, the color of PVC stabilized with pure PSE-Zn began to degrade when the sample was heated at 180°C for 60 min indicating the unsatisfactory long-term thermal stability presented by PSE-Zn on PVC. So, some commercial thermal stabilizers, for example, calcium stearate (CaSt2), zinc stearate (ZnSt2), or CaSt2/ZnSt2 were employed along with PSE-Zn to further improve the stabilizing performance. The results showed that there was a synergistic effect that was between 2 phr PSE-Zn and 2 phr CaSt2 and made the stabilized PVC possess the best thermal stability. Because of the presence of free hydroxyl in PSE-Zn, which could chelate ZnCl2, PSE-Zn can then restrain “zinc-burning” phenomenon when PSE-Zn and ZnSt2 were used together. It was also found that PVC stabilized with 3 phr PSE-Zn and 1 phr CaSt2/ZnSt2 had the best color stability. The mechanism of thermal stability of PSE-Zn was also discussed. As a metal alkoxide, PSE-Zn is readily to neutralize HCl. In addition, PSE-Zn is able to replace the allyl chloride to terminate the dehydrochlorination of PVC. Moreover, because of the stearate radicals, PSE-Zn had a very low melting point, a better compatibility with PVC, and a lubrication action. With these excellent properties, PSE-Zn would be able to make PVC achieve an excellent initial color and a long-term stability. J. VINYL ADDIT. TECHNOL., 24:314–323, 2018.
AB - A novel pentaerythritol stearate ester-based zinc alkoxide (PSE-Zn) was synthesized through a two-step method. Zinc ethoxide was first prepared from zinc acetate and ethanol, and then with ethanol as the solvent, the obtained zinc ethoxide ester was heated together with pentaerythritol stearate to produce PSE-Zn. PSE-Zn could be used as a promising poly(vinyl chloride) (PVC) thermal stabilizer. Conductivity tests, thermal aging tests, and UV-visible spectroscopy were used to study the thermal stabilization performance of the thermal stabilizers of PSE-Zn on PVC. The results showed that, with a lower melting point and a good compatibility with PVC, PSE-Zn presented a significant improvement in maintaining the initial color of PVC. However, the color of PVC stabilized with pure PSE-Zn began to degrade when the sample was heated at 180°C for 60 min indicating the unsatisfactory long-term thermal stability presented by PSE-Zn on PVC. So, some commercial thermal stabilizers, for example, calcium stearate (CaSt2), zinc stearate (ZnSt2), or CaSt2/ZnSt2 were employed along with PSE-Zn to further improve the stabilizing performance. The results showed that there was a synergistic effect that was between 2 phr PSE-Zn and 2 phr CaSt2 and made the stabilized PVC possess the best thermal stability. Because of the presence of free hydroxyl in PSE-Zn, which could chelate ZnCl2, PSE-Zn can then restrain “zinc-burning” phenomenon when PSE-Zn and ZnSt2 were used together. It was also found that PVC stabilized with 3 phr PSE-Zn and 1 phr CaSt2/ZnSt2 had the best color stability. The mechanism of thermal stability of PSE-Zn was also discussed. As a metal alkoxide, PSE-Zn is readily to neutralize HCl. In addition, PSE-Zn is able to replace the allyl chloride to terminate the dehydrochlorination of PVC. Moreover, because of the stearate radicals, PSE-Zn had a very low melting point, a better compatibility with PVC, and a lubrication action. With these excellent properties, PSE-Zn would be able to make PVC achieve an excellent initial color and a long-term stability. J. VINYL ADDIT. TECHNOL., 24:314–323, 2018.
UR - http://www.scopus.com/inward/record.url?scp=85029547945&partnerID=8YFLogxK
U2 - 10.1002/vnl.21602
DO - 10.1002/vnl.21602
M3 - Article
AN - SCOPUS:85029547945
SN - 1083-5601
VL - 24
SP - 314
EP - 323
JO - Journal of Vinyl and Additive Technology
JF - Journal of Vinyl and Additive Technology
IS - 4
ER -