Effect of sodium⁃A molecular sieve on heat stability of PVC

doi:10.19491/j.issn.1001-9278.2025.02.014

Abstract

Abstract:

The thermal stability of poly（vinyl chloride）（PVC） could be improved by a sodium⁃A molecular sieve according to the Congo red experiment. The static thermal stability time of the modified PVC was increased up to 72 min， which was better than that of pure PVC （7 min）. The sodium⁃A molecular sieve was compounded with β⁃diketone， pentaerythritol， phenyl diisooctyl phosphate and epoxidized soybean oil to obtain a compounding heat stabilizer. The static and dynamic thermal stability of the PVC stabilized with this compounding heat stabilizer was measured by using Congo red test paper， thermal aging oven， and torque rheometry methods， and its thermal weight loss was analyzed by thermogravimetry. The results indicated that the heat⁃stabilized PVC achieved the best thermal stabilization effect at a mass ratio of sodium⁃A molecular sieve to β⁃diketone of 1/1， exhibiting a static thermal stabilization time of 84 min， a dynamic thermal stabilization time of 1 137 s， a shortest plasticization time of 104 s， and a minimum equilibrium torque of 37.94 N·m.

Key words: poly（vinyl chloride）, sodium?A molecular sieve, heat stabilizer

CLC Number:

TQ314.24⁺5.1

YANG Xiaochun, LIU Huiyuan, ZHANG Qing, YU Jing. Effect of sodium⁃A molecular sieve on heat stability of PVC[J]. China Plastics, 2025, 39(2): 77-81.

Figures/Tables 7

Fig.1. Effect of sodium⁃A molecular sieve and β⁃diketone ratios on thermal stability time of the PVC

Fig.2. Effects of different ratios of sodium⁃A molecular sieve and pentaerythritol on static thermal stability of the PVC

Fig.3. Effect of sodium⁃A molecular sieve and phenyl diisooctyl phosphate ratios on static thermal stability time of the PVC

Fig.4. Effect of sodium⁃A molecular sieve and epoxy soybean oil ratios on static thermal stability time of the 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	60	70	80	90	100
—	—
β⁃二酮	1/1
季戊四醇	1/1
亚磷酸一苯二异辛酯	1/0.5
环氧豆油	1/1.5

Tab.1. Test results of anti discoloration of different heat stabilizers

Fig.5. Dynamic thermal stability of the samples

Fig.6. TG and DTG curves of different PVC samples

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