Effects of ZnAl layered double hydroxide and benzimidazole derivative on the dechlorination of poly(vinyl chloride)

Jin, Dandan; Khanal, Santosh; Xu, Shiai

doi:10.1016/j.clay.2021.106114

Cited by 5 publications

(9 citation statements)

References 35 publications

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“…The Congo Red method qualitatively analyzes the static thermal stability of PVC by recording the time, which the concentration of HCl produced by the thermal degradation of the PVC material reached PH = 3. [ 26 ] The effect of Y‐CG addition on the stability time of the Congo Red method in Figure 10. Pure PVC material degraded quickly to produce a large amount of HCl, and the thermal stability time was only 3.6 min.…”

Section: Resultsmentioning

confidence: 99%

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A novel coal gangue thermal stabilizer and its effect on thermal stability and mechanical properties of poly(vinyl chloride)

Hou

et al. 2022

Vinyl Additive Technology

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Nontoxic and efficient coal gangue thermal stabilizer (Y-CG) was prepared by cheap and readily available calcium oxide, coal gangue (CG) and stearic acid(SA). The proposed mechanism of Y-CG thermal stability was studied by XRD, FT-IR, BET and thermal stability test. The results show that when the mass ratio of CG to water was 1:7, the loading of Ca(OH) 2 between CG sheets reached the maximum value of 3.01 mmol/g. The hydrophobic property of the Y-CG surface was better when modified at 75 C for 2 h with 5% SA. With 10% Y-CG, the Congo red test showed thermal stabilization time of PVC improved up to 55.9 min and the torque rheological test showed dynamic thermal stabilization time of PVC improved up to 62.10 min. The TG curves show that Y-CG had little effect on the onset degradation temperature of PVC. Still, Y-CG can absorb HCl and initiate the carbonization of PVC to inhibit degradation. Compared with the commonly used thermal stabilizers, the thermal stability of Y-CG was only slightly worse than that of hydrotalcite thermal stabilizers. The early reaction was that the strong base Ca(OH) 2 in Y-CG adsorbs HCl, and the CaCl 2 was stably loaded in the CG layered structure, which avoided the adverse effects caused by strongly alkaline. The late reaction was that SA and Ca(OH) 2 form weakly alkaline calcium stearate to absorb HCl. At the same time, calcium stearate can also be used as a compatibilizer to improve the compatibility between Y-CG and PVC.

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Section: Resultsmentioning

confidence: 99%

“…These results illustrated that Y-CG had little effect on the initial adsorption of PVC. Nevertheless, Y-CG could remove hydrogen chloride, quickly dehydrate and carbonize the polymer surface, and form a carbonized layer, [26,31] which improved the thermal stability of PVC material and has a certain flame retardant effect. [32]…”

Section: Tg and Dtg Testmentioning

confidence: 99%

A novel coal gangue thermal stabilizer and its effect on thermal stability and mechanical properties of poly(vinyl chloride)

Hou

et al. 2022

Vinyl Additive Technology

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“…137 However, it can only be dissolved in a specific organic solvent, and cannot be used to modify LDH. Therefore, to further improve the thermal stability of PVC, Jin et al 138 synthesized the benzimidazole derivative (OBPB)-modified ZnAl-LDH (OBPB@ZLDH) by preparing the benzimidazole derivative with a large amount of -COOH groups that could interact with LDHs and compared the dechlorination effect of PVC/OBPB@ZLDH and PVC/OBPB/ ZLDH composites. It was found that the physical interaction between OBPB and ZLDH promoted the low-temperature dechlorination of PVC.…”

Section: Dechlorinationmentioning

confidence: 99%

An overview on the recycling of waste poly(vinyl chloride)

Jiang¹,

Zhu²,

Zhu³

2023

Green Chem.

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“…Therefore, a thermal stabilizer must be added during PVC processing to prevent or reduce its thermal degradation. 2 − 4 …”

Section: Introductionmentioning

confidence: 99%

“…PVC is easy to decompose at the processing temperature, resulting in the deepening of product color and the change of structure and properties. Therefore, a thermal stabilizer must be added during PVC processing to prevent or reduce its thermal degradation. − …”

Section: Introductionmentioning

confidence: 99%

Bean Dreg–Hydrocalumite Composite as a Highly Efficient Thermal Stabilizer for Poly(vinyl chloride)

Luo

Tang

Yuan³

et al. 2022

ACS Omega

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Bean dreg (BD)–hydrocalumite composites were prepared by a hydrothermal method with BD, Ca(OH) 2 , Al(OH) 3 , and Na 2 CO 3 as raw materials. The samples were characterized by powder X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and N 2 physical adsorption–desorption. Their properties as a thermal stabilizer for poly(vinyl chloride) were tested using a torque rheometer and static thermal aging method. Compared with traditional hydrocalumite, the crystal size of the BD–hydrocalumite composite was relatively small, which made it exhibit good dispersion and better thermal stability for poly(vinyl chloride). In addition, the effects of preparation conditions on the properties of BD–hydrocalumite as a heat stabilizer were also investigated. Under the conditions of n [Ca(OH) 2 /Al(OH) 3 /Na 2 CO 3 ] = 4.4:2:1, a BD dosage of 5%, a crystallization temperature of 90 °C, and 19 h, the prepared BD–hydrocalumite showed the best performance, and the dynamic thermal stability time of poly(vinyl chloride) reached 2149 s.

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Effects of ZnAl layered double hydroxide and benzimidazole derivative on the dechlorination of poly(vinyl chloride)

Cited by 5 publications

References 35 publications

A novel coal gangue thermal stabilizer and its effect on thermal stability and mechanical properties of poly(vinyl chloride)

A novel coal gangue thermal stabilizer and its effect on thermal stability and mechanical properties of poly(vinyl chloride)

An overview on the recycling of waste poly(vinyl chloride)

Bean Dreg–Hydrocalumite Composite as a Highly Efficient Thermal Stabilizer for Poly(vinyl chloride)

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