Preparation and characterization of zinc-mannitol complexes as PVC thermal stabilizers with high efficiency

Zhu, Lizhi; Wu, Yijian; Shentu, Baoqing; Wang, Zhixue

doi:10.1016/j.polymdegradstab.2016.09.024

Cited by 31 publications

(16 citation statements)

References 23 publications

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“…Polyvinyl chloride (PVC) has been widely employed in industry, construction, signage, toys, packing material, electronic applications, etc. (Moulay, 2010;Sabaa et al, 2009;Zhu et al, 2016). PVC is the most common thermoplastic used as insulation in electric wires (Morsy et al, 2003), due to its easy processing, good insulation capacity, high chemical resistance and low flammability (Akovali, 2012;Zabłocka-Malicka et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Dechlorination of polyvinyl chloride electric wires by hydrothermal treatment using K2CO3 in subcritical water

et al. 2020

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Polyvinyl chloride (PVC) waste generation has significantly increased in recent years and their disposal is considered a major environmental concern. Removal techniques of chlorine from PVC waste are being studied to minimize a negative environmental impact. In this work, the use of K2CO3 as an alkaline additive to improve the dechlorination efficiency (DE) in the hydrothermal degradation of PVC wires was studied. Different experiments were carried out varying both temperature (175 ºC, 200 ºC, 225 ºC, 235 ºC and 250 ºC) and K2CO3 concentration (0.025 M, 0.050 M and 0.125 M), using a solid/liquid ratio of 1:5 in order to determine the evolution of the dechlorination efficiency with time. About 4.66, 21.1, 24.4, 45.7 and 92.6 wt. % of chlorine in PVC wire was removed during hydrothermal dechlorination (HTD) with an additive/chlorine ratio of 1:25 (K2CO3 solution of 0.050 M) at 175, 200, 225, 235 and 250 ºC, respectively. Optimal additive/chlorine ratio decreased to 1:50 (K2CO3 solution of 0.025 M) at 250 ºC, obtaining a dechlorination degree of 99.1% after 4 hours without the need of metallic catalysts. Concerning the solid phase behavior during dechlorination, a linear correlation between the DE reached and the weight loss of PVC was found including every experiment performed in this work.

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Section: Introductionmentioning

confidence: 99%

Dechlorination of polyvinyl chloride electric wires by hydrothermal treatment using K2CO3 in subcritical water

et al. 2020

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“…A number of new types of thermal stabilizers, for example, zinc and calcium salts of 11-maleimideoundecanoic acid, liquid Ca/Zn thermal stabilizer synthesized, zinc and calcium oxolinic complexes, ricinoleic acid-based Ca/Zn stabilizer, have been reported [11,13,[15][16][17][18][19] . Some researchers also indicated that polyols can serve as auxiliary thermal stabilizers.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Di-Mannitol Adipate Ester-Based Zinc Metal Alkoxide As Bi-Functional Additives for PVC

Li¹,

Li²,

Han³

et al. 2019

Preprint

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A new di-mannitol adipate ester-based zinc metal alkoxide (DMAE-Zn) was synthesized as a bi-functional PVC thermal stabilizer for the first time. The materials were characterized with Fourier-transform Infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Characterization results confirmed the formation of Zn-O bonds in DMAE-Zn; and that DMAE-Zn had a high decomposition temperature and a low melting point. The thermal stability of DMAE-Zn on PVC also was tested by conductivity test, thermal aging test, and UV-visible spectroscopy (UV-VIS) test. PVC stabilized by DMAE-Zn had a good initial color and excellent long-term stability. UV-VIS also showed that the conjugated structure in PVC stabilized by DMAE-Zn was almost all of the triene, suggesting that the addition of DMAE-Zn would suppress the formation of conjugated structures above tetraene. Dynamic processing performance of PVC samples tested by torque rheometer indicated that, having a good compatibility with PVC chains in the amorphous regions, DMAE-Zn contributed good plasticizing effect to PVC. DMAE-Zn thus effectively demonstrates bi-functional roles, e.g., thermal stabilizers and plasticizers to PVC. Furthermore, FT-IR, HCl absorption capacity test, and complex ZnCl2 test were also used to verify the thermal stability mechanism of DMAE-Zn for PVC.

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“…As listed in Table 5, LAB combined with ZnSt 2 acted best on PVC samples, both in terms of antidiscoloration performance and thermal stability time. When different kinds of rare earth salts were mixed with zinc salts, they would show different resistance to “zinc burning”, [ 14 ] which was closely related to the ion radius of rare earth elements. Rare earth ions with a small atomic number had a large radius, so when forming complexes, their coordination number increased accordingly.…”

Section: Resultsmentioning

confidence: 99%

Study on the Use of Rare Earth Stabilizer as Poly(Vinyl Chloride) Stabilizer

Liu

Fan

Feng

et al. 2020

Vinyl Additive Technology

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Lanthanum aminobenzoate (LAB), cerium aminobenzoate (CAB), and lanthanum and cerium aminobenzoate (LCAB) were synthesized with p‐aminobenzoic acid, lanthanum nitrate, or cerium nitrate as raw materials to study the influence of different rare earth elements on the stability of rare earth stabilizers. The thermal stability of by CAB, LCAB, and LAB toward poly(vinyl chloride) (PVC) was studied. The results of Congo red test and thermal aging test showed when three rare earth stabilizers acted independently, the advantages and disadvantages of thermal stability are as follows: LAB > CAB > LCAB. However, in compound experiments, the thermal stability of composite stabilizers compounded by CAB or LCAB with zinc stearate, calcium stearate, or pentaerythritol (PE) was slightly better than that of composite stabilizers compounded by LAB. Among of them, when the compounding scheme was LCAB:zinc stearate:PE = 1:1:3, the thermal stability time reached 60 minutes; CAB:zinc stearate:PE = 1:1:3, the thermal stability time reached 50 minutes, compared with the rare earth stabilizer alone, the composite thermal stabilizer gave PVC samples better antidiscoloration performance and longer thermal stability time.

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Preparation and characterization of zinc-mannitol complexes as PVC thermal stabilizers with high efficiency

Cited by 31 publications

References 23 publications

Dechlorination of polyvinyl chloride electric wires by hydrothermal treatment using K2CO3 in subcritical water

Dechlorination of polyvinyl chloride electric wires by hydrothermal treatment using K2CO3 in subcritical water

Facile Synthesis of Di-Mannitol Adipate Ester-Based Zinc Metal Alkoxide As Bi-Functional Additives for PVC

Study on the Use of Rare Earth Stabilizer as Poly(Vinyl Chloride) Stabilizer

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