Surface Modification of Silica/carbon Black Derived from Rice Husks and Its Influence on Natural Rubber Composites†

doi:10.7503/cjcu20190077

Abstract

Abstract:

Surface modification of silica/carbon black(SiCB) derived from rice husks was carried out by grafting with natural rubber latex(NRL). The effect of different pre-treatments on the grafting efficiency was investigated and the mechanical properties of NR/NRL-grafted SiCB vulcanizates were tested. The results indicated that the SiCB pre-treated by nitric acid and 3-(trimethoxysilyl) propyl methacrylate(γ-MPTMS) can be effectively grafted with NRL via the strong interfacial bonding. The above modified SiCB(SiCB_MR10) exhibited good dispersion state and superior reinforcement ability, attributed to the use of NRL as a compatibilizer for filler-matrix composites. The tensile strength, stress at 300% elongation and tear strength of NR/SiCB_MR10 were 61.06%, 27.15% and 15.90% higher than those of NR/SiCB_P, respectively. The modified SiCB_MR10 achieved the similar reinforcement with the conventional carbon black(N774) in mechanical properties of NR vulcanizate. The results showed that SiCB_MR10 exhibited an ideal reinforcing effect on rubber.

Key words: Silica/carbon black composite, Surface modification, Natural rubber latex, Mechanical property

CLC Number:

O636
O611.4

TrendMD:

SUI Jiayang, LIU Xiaoyang, QIAN Miaomiao, ZHU Yanchao, XUE Beichen, FENG Yi, TIAN Yumei, WANG Xiaofeng. Surface Modification of Silica/carbon Black Derived from Rice Husks and Its Influence on Natural Rubber Composites^†[J]. Chem. J. Chinese Universities, 2019, 40(7): 1561.

Figures/Tables 12

Scheme 1 Preparation flow diagram of the NRL-grafted SiCB samples * Quality rate of NRL(or BPO) to SiCB.

Table 1 NR/SiCB compound formulations

Material	m/g	Material	m/g
NR	100.0	4010NA	1.8
Filler^*	50.0	Antioxidant RD	1.0
Stearic acid	2.5	Antioxidant H	0.3
Zinc oxide	5.0	NOBS	0.7
Paraffin	1.0	Sulfur	2.3
Aromatic oil	6.0

Fig.1 FTIR spectra of SiCBP(A), SiCBSI(B), SiCBA(C) and SiCBM(D)

Fig.2 TEM images of SiCBP(A), SiCBPR10(B), SiCBSIR10(C) and SiCBMR10(D)

Fig.3 SEM images of SiCBP(A), SiCBPR10(B), SiCBSIR10(C) and SiCBMR10(D)

Fig.4 Grafting efﬁciency of SiCBPR10, SiCBSIR10 and SiCBMR10

Scheme 2 Preparation mechanism of SiCBMR10

Fig.5 Water static contact angles of SiCBPR10(A), SiCBSIR10(B) and SiCBMR10(C)

Fig.6 Static precipitation of SiCBP, SiCBPR10, SiCBSIR10 and SiCBMR10 after 1 min(A), 2 h(B), 8 h(C), 10 h(D) and 15 d(E)

Fig.7 SEM images of tensile fractured surfaces of NR/SiCBP(A), NR/SiCBPR10(B), NR/SiCBSIR10(C) and NR/SiCBMR10(D)

Table 2 Mechanical properties of NR/SiCB composites and the NR/N774 composite

Sample	Tensile strength/MPa	Elongation at break(%)	Stress at 300% elongation/MPa	Tear strength/ (kN·m^-1)	Shore A hardness
NR/N774	18.35	1226.27	4.02	44.76	57.00
NR/SiCB_P	13.38	919.56	3.72	38.29	57.00
NR/SiCB_PR10	15.69	1456.52	2.95	35.40	53.00
NR/SiCB_SIR10	16.58	1494.03	2.91	38.12	52.00
NR/SiCB_MR10	21.55	1166.61	4.73	44.38	56.00

Fig.8 Akron abrasion of the rubber compositesa. N774; b. SiCBP; c. SiCBPR10; d. SiCBSIR10; e. SiCBMR10.

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