Preparation and Performance of Hydrotalcite⁃filled PVC Composites

doi:10.19491/j.issn.1001-9278.2021.07.011

Abstract

Abstract:

In this work， hydrotalcite （HT） was surface modified with a liquid nitrile rubber （LNBR）. The resultant LNBR?modified HT was filled into poly（vinyl chloride）（PVC） to prepare PVC/LNBR?modified HT composites. The modification of HT by LNBR，the effect of the content of HT before and after modification on the mechanical properties， flame retardant properties， dynamic mechanical properties and micro morphology of the composites was investigated using， infrared spectrometer simply supported beam impact testing machine， universal testing machine， oxygen index tester， dynamic mechanical analyzer and scanning electron microscope. The results indicated that the surface modification of HT with LNBR belonged to a physical modification. Own to good compatibility between LNBR and the PVC matrix， the dispersibility of LNBR?modified HT in the PVC matrix was improved， and the interfacial adhesion between LNBR and the PVC matrix was enhanced. The PVC/LNBR?modified HT composites exhibited better performance than that of the PVC/unmodified HT composites. The PVC/LNBR/HT composites achieved maximum tensile strength of 29.8 MPa and maximum notched impact strength of 17.7 kJ/m² with the addition of 5 phr and 10 phr of LNBR?modified HT， respectively. Moreover， the PVC/LNBR/HT composites presented an limiting oxygen index of 34.6 vol% with the addition of 40 phr LNBR?modified HT. LNBR plays dual roles as compatibilizer and plasticizer in the PVC/LNBR/HT composites. This leads to an increase in rigid， but a decrease in heat resistance.

Key words: poly（vinyl chloride）, hydrotalcite, liquid nitrile rubber, composite, mechanical property, flame retardancy

CLC Number:

TQ325.2

LIU Xianggui, FANG Wei, SHU Hongbin, ZHENG Genwen, LIU Hai. Preparation and Performance of Hydrotalcite⁃filled PVC Composites[J]. China Plastics, 2021, 35(7): 63-68.

Figures/Tables 8

样品编号	PVC	Ca/Zn稳定剂	DOP	PE蜡	ACR	HT	LNBR/HT
1	100	3	20	2	8	-	-
2	100	3	20	2	8	5	-
3	100	3	20	2	8	10	-
4	100	3	20	2	8	20	-
5	100	3	20	2	8	40	-
6	100	3	20	2	8	-	5
7	100	3	20	2	8	-	10
8	100	3	20	2	8	-	20
9	100	3	20	2	8	-	40

Tab.1. Formulation of composite materials

Fig.1. FTIR spectra of HT， LNBR and LNBR/HT

Fig.2. Tensile strength of the PVC/HT and PVC/LNBR/HT composites

Fig.3. Notched impact strength of the PVC/HT and PVC/LNBR/HT composites

Fig.4. Limiting oxygen index of the PVC/HT and PVC/LNBR/HT composites

Fig.5. tanδ of the PVC/HT and PVC/LNBR/HT composites

Fig.6. Storage modulus of the PVC/HT and PVC/LNBR/HT composites

Fig.7. SEM images of PVC/HT and PVC/LNBR/HT composites

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