Study on Synthesis and Properties of Butyl Stannate Intercalated Hydrotalcite⁃like Compound for PVC

doi:10.19491/j.issn.1001-9278.2021.03.006

Abstract

Abstract:

A series of butylstannate-intercalated Ca/Zn-rare-earth hydrotalcite-like compounds （CA/ZnAlLa-BS-LDHs） were synthesized with butyltinic acid， lanthanum nitrate， calcium nitrate and zinc nitrate as raw materials. Their molecular structures were characterized by using Fourier-transform infrared spectroscopy， X-ray powder diffraction， and scanning electron microscope. Furthermore， the thermal stability of the poly（vinyl-chloride）（PVC） containing the hydrotalcite-like compounds were evaluated by means of Congo red testing method， thermal aging oven method and torque rheometer. Their flame retardancy and stretching property were investigated by limiting oxygen index， vertical combustion method and mechanical spectrometer. The results indicated that there is a “Zinc burning” phenomenon appearing in the ZnAlLa-BS-LDHs appeared， but the CaAlLa-BS-LDHs exhibited a good thermal stability with initial whiteness of 30 min and a low torque value. The optimum synergistic effect was obtained at a mass ratio of ZnAlLa-BS-LDHs to CaAlLa-BS-LDHs of 0.75/2.25. Their stabilized PVC compounds presented static and dynamic thermal time of 110 and 43.6 min， respectively， and their initial whiteness was extended to 40 min together with a moderate torque. The ZnAlLa-BS-LDHs showed better flame retardancy with a limiting oxygen index （LOI） of 27.6 vol%. The LOI was increased to 29.7 % along with a UL 94 classification of V-0 grade at a ZnAlLa-BS-LDHs/CaAlLa-BS-LDHs mass ratio of 2/1. There is no obvious influence on the tensile properties of the PVC compounds from these two additives.

Key words: poly（vinyl chloride）, hydrotalcite?like, organostannate, intercalation, flame retardant

CLC Number:

TQ325.3

LI Xianming, ZHANG Ning, LIU Zhengyuan, LIU Luiyuan. Study on Synthesis and Properties of Butyl Stannate Intercalated Hydrotalcite⁃like Compound for PVC[J]. China Plastics, 2021, 35(3): 38-43.

Figures/Tables 8

References 12

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样品编号	PVC/份	ZnAlLa?BS?LDHs/份	CaAlLa?BS?LDHs/份
0^#	100	0	0
1^#	100	3.0	0
2^#	100	0	3.0
3^#	100	2.4	0.6
4^#	100	2.25	0.75
5^#	100	2.0	1.0
6^#	100	1.5	1.5
7^#	100	1.0	2.0
8^#	100	0.75	2.25
9^#	100	0.6	2.4

样品编号	PVC/份	ZnAlLa?BS?LDHs/份	CaAlLa?BS?LDHs/份
0^#	100	0	0
1^#	100	3.0	0
2^#	100	0	3.0
3^#	100	2.4	0.6
4^#	100	2.25	0.75
5^#	100	2.0	1.0
6^#	100	1.5	1.5
7^#	100	1.0	2.0
8^#	100	0.75	2.25
9^#	100	0.6	2.4

样品编号	热稳定时间/min	试样随加热时间的颜色变化
样品编号	热稳定时间/min	10 min	20 min	30 min	40 min	50 min	60 min	80 min	100 min	120 min
1^#	46
2^#	70
3^#	64
4^#	76
5^#	81
6^#	78
7^#	83
8^#	110
9^#	85

样品编号	热稳定时间/min	试样随加热时间的颜色变化
样品编号	热稳定时间/min	10 min	20 min	30 min	40 min	50 min	60 min	80 min	100 min	120 min
1^#	46
2^#	70
3^#	64
4^#	76
5^#	81
6^#	78
7^#	83
8^#	110
9^#	85

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