Effects of N⁃ethylpiperazinylphthalomide zinc on thermal stability of PVC

doi:10.19491/j.issn.1001-9278.2022.02.018

Abstract

Abstract:

N?ethylpiperazine?based phthalate was synthesized using phthalic anhydride and N?ethylpiperazine as raw materials， and then the obtained product was reacted with zinc chloride to prepare N?ethylpiperazinylphthalomide zinc （ZNEP）. Four types of composite heat stabilizers were obtained separately through compounding ZNEP with pentaerythritol， dimethylbenzoyl methane （β?diketone）， epoxy soybean oil， and phenyl diisooctyl phosphate， and their effect on the static thermal stability， dynamic thermal stability and thermal degradation process of PVC was investigated using the Congo red test paper method， thermal aging oven method， torque rheometer， and thermal gravimetric analysis. The results indicated that the PVC compounds achieved an optimum thermal stability at a mass ratio of ZNEP to pentaerythritol of 1∶2. The static and dynamic thermal stability times were determined to be 2 340 and 1 602 s respectively. Comparing to the PVC sample without heat stabilizer， the heat?stabilized PVC exhibited an increase in T_{5 %}， T_{10 %}， and T_max， indicating that the composite heat stabilizer can effectively inhibit the thermal degradation of PVC.

Key words: polyvinylchloride, heat stabilizer, ethylpiperazine

CLC Number:

TQ314.24⁺5.1

YANG Xiaochun, YU Jing, ZHANG Qing. Effects of N⁃ethylpiperazinylphthalomide zinc on thermal stability of PVC[J]. China Plastics, 2022, 36(2): 125-130.

Figures/Tables 8

Fig.1. Effect of ZNEP and pentaerythritol compound system on static thermal stability of PVC

Fig.2. Effectof ZNEP and β?diketone compound system on static thermal stability of PVC

Fig.3. Effectof ZNEP and epoxy soybean oil compound system on static thermal stability of PVC

Fig.4. Effectof ZNEP and phenyl diisooctyl phosphate compound system on static thermal stability of PVC

辅助热稳定剂	主辅热稳定剂质量比	热老化时间/min
辅助热稳定剂	主辅热稳定剂质量比	5	10	15	20	25	30	35	40	45	50
—	—
季戊四醇	1∶2
β⁃二酮	1∶1
环氧大豆油	1∶2.5
亚磷酸一苯二异辛酯	1∶4

Tab.1. Thermal aging discoloration of the composite thermal stabilizers

Fig.5. Dynamic thermal stability of the samples

Fig.6. TG and DTG curves of samples containing different heat stabilizers

样品	T_{5 %}/℃	T_{10 %}/℃	T_max/℃
PVC	253	267	288
PVC/ZNEP	284	292	309
PVC/ZNEP/季戊四醇	295	304	315
PVC/ZNEP/β⁃二酮	265	278	296
PVC/ZNEP/环氧大豆油	287	297	311
PVC/ZNEP/亚磷酸一苯二异辛酯	285	293	309

Tab.2. Effect of the compound heat stabilizer on thermal degradation of PVC

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