Design and application of new ternary composite antioxidant system for coal⁃based polypropylene

doi:10.19491/j.issn.1001-9278.2021.12.001

Abstract

Abstract:

A series of novel ternary composite antioxidant systems with different types and mass ratios were designed.
These antioxidant systems were based on the BASF antioxidant Irganox®1010 as a main antioxidant and Irgafos®168 as an
auxiliary antioxidant at a basis mass ratio of 1∶1 together with Revonox®420 as a carbon radical capture agent. Such antioxi⁃
dant systems were applied for the modification of coal⁃based homopolypropylene（homo⁃PP）to enhance its thermo⁃oxida⁃
tive aging performance. The resultant modified homo⁃PP was evaluated with oxidation induction time（OIT），yellow index，melting flow rate and mechanical performance. The results indicated that the modified homo ⁃PP achieved optimum anti⁃oxidative performance by means of an antioxidant composite system based on Irganox®1010，Irgafos®168，and Revonox®420. This composite antioxidant system resulted in the longest oxidation induction time of 9. 8 min，a yellow index of 1. 3，and a melting flow rate of 10. 7 g/10 min for the modified homo⁃PP. Moreover，the modified homo⁃PP gained an optimum anti⁃yellowing effect at a mass ratio of Irganox®1010 and Irgafos®168 of 1∶2. These results provide a good reference for the design and development of high⁃efficient and long⁃term antioxidant system for the coal⁃based homo⁃PP.

Key words: coal-based homopolypropylene, antioxidant, thermo-oxidative aging, oxidation induction time

CLC Number:

TQ325.1⁺4

ZHENG Pengcheng, LI Ruilong, CHEN Couxi, ZHANG Shouyu, JIANG Ruyuan, CHEN Tonghai, SONG Chengpeng, JIAO Qi. Design and application of new ternary composite antioxidant system for coal⁃based polypropylene[J]. China Plastics, 2021, 35(12): 1-8.

Figures/Tables 10

样品编号	煤基均聚PP	Irganox^?1010	AT?3114	AT?626	Irgafos^?168	Revonox^?420	硬脂酸钙
1^#	99.814	0.030	-	-	0.060	0.016	0.080
2^#	99.814	0.060	-	-	0.030	0.016	0.080
3^#	99.814	0.045	-	-	0.045	0.016	0.080
4^#	99.814	-	0.045	-	0.045	0.016	0.080
5^#	99.814	-	0.060	-	0.030	0.016	0.080
6^#	99.814	-	0.060	0.030	-	0.016	0.080
7^#	99.830	0.045	-	-	0.045	-	0.080
8^#	99.830	-	0.045	-	0.045	-	0.080

Tab.1. Formulation of composite antioxidant system for coal?based PP

Fig.1. Scheme of thermo?oxidative aging and antioxidant mechanisms of PP

Fig.2. OIT of coal?based PP samples at 200 ℃

Fig.3. DSC curves and corresponding OIT results of coal?based PP samples

Fig.4. DSC curves and corresponding oxidation induction temperature results of coal?based PP samples

Fig.5. SEM images of impact fracture surfaces of coal?based PP samples

Fig.6. Yellow indexes of coal?based PP samples

Fig.7. Digital photographs of coal?based PP samples after thermo?oxidative aging at 150 ℃ for 500 h

Fig.8. Mechanical properties of coal?based PP samples after thermo?oxidative aging at 150 ℃

Fig.9. Melting flow rates of coal?based PP samples after single and multiple extrusion

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