Synthesis of Piperazinyl Monobutyric Amic Acid Calcium/Zinc and Its Thermal Stabilization for PVC

doi:10.19491/j.issn.1001-9278.2020.07.012

Abstract

Abstract:

A piperazinyl monobutyric amic acid calcium/Zinc (PSACa/Zn) thermal stabilizer was synthesized by a two?step reaction using succinic anhydride, piperazine, calcium chloride and zinc chloride as raw materials, and its chemical structure of the synthesized product was characterized by elemental analysis, inductively coupled plasma atomic emission spectrometry and Fourier?transform infrared spectroscopy. The thermal stabilization effect of PSACa/Zn on PVC was investigated by a Congo red paper method, torque rheometer and thermogravimetric analysis (TGA), and an optimum mass ratio of PSACa/PSAZn was achieved. The results indicated that the static thermal stability time of PVC modified with PSACa and PSAZn reached 74.5 and 41.5 min, respectively, which was better than the stabilization effect of calcium stearate and zinc stearate. With the combination of PSACa and PSAZn (m_PSACa∶m_PSAZn = 1∶1), the modified PVC exhibit a static thermal stabilization time of 92 min, and a dynamic thermal stabilization time of 905 s. PSACa/Zn has a long?term thermal stabilization effect on PVC according to the thermal analysis result.

Key words: poly (vinyl chloride), calcium/zinc thermal stabilizer, piperazine, amic acid

CLC Number:

TQ325.3

Jing YU, Minxian LI. Synthesis of Piperazinyl Monobutyric Amic Acid Calcium/Zinc and Its Thermal Stabilization for PVC[J]. China Plastics, 2020, 34(7): 74-79.

Figures/Tables 7

产物		质量分数/%				分子式
产物		C	H	Ca	Zn	分子式
PSACa	理论值	44.44	4.94	12.35	—	C₁₂H₁₆O₆N₂Ca
PSACa	实测值	43.85	5.01	12.18	—	C₁₂H₁₆O₆N₂Ca
PSAZn	理论值	41.26	4.58	—	18.62	C₁₂H₁₆O₆N₂Zn
PSAZn	实测值	40.98	4.71	—	18.45	C₁₂H₁₆O₆N₂Zn

Tab.1. Elemental analysis of the products

Fig.1. FTIR spectra of PSACa and PSAZn

Fig.2. Static thermal stability time of different PVC systems

Fig.3. Effect of mass ratio of PSACa and PSAZn on thermal stability of PVC

Fig.4. Comparison of dynamic thermal stability of PSACa/Zn and Cast2/Znst2 on PVC

Fig.5. TG curve of PVC samples

Fig.6. DTG curve of PVC samples

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