SURFACE MODIFICATION OF ULTRA2FINE BRUCITE POWDER BY SILANE COUPL ING AGENT

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1 33 5 Vol. 33, No J OURNAL OF T H E CHIN ESE CERAMIC SOCIET Y May, , 1 2, (1., ; 2., ) : 2 (polypropylene,pp), PP/ ( scanning elec2 tron microscope, SEM),Fourier PP/ SEM : A 174 FR % 1. 0 % 80 PP/ 0. 3 kj/ m 2, 30 %, FR MPa,2 : ; ; ; ; : T G985 : A : (2005) SURFACE MODIFICATION OF ULTRA2FINE BRUCITE POWDER BY SILANE COUPL ING AGENT DU Gaoxiang 1, Z H EN G S huilin 1, L I Yang 2 (1. Department of Chemistry and Environment Engineering, China University of Mining and Technology, Beijing ; 2. Beijing University of Technology, Beijing , China) Abstract : Surface2modified ultra2fine brucite powder is a kind of environment2f riendly fire2retardant of polymer. The ultra2fine brucite powder was surface2treated with two kinds of silane (A 174 and FR 693), and then filled into polypropylene ( PP) as a kind of fire2retardant aimed. The effect of modification by silane on the properties of PP/ brucite composite material was stud2 ied. The effect and modification mechanism were investigated by means of Fourier transfer infrared analysis, scanning electron microscopy of brucite powder and the f resh new surface of PP/ brucite. The result s show that the optimal dosage of brucite powde for silane A 174 and silane FR 693 is 1. 5 % and 1. 0 % in mass respectively and the temperature of surface treatment is 80. It indicates that the surface modification can enhance the izod impact strength of PP/ Mg (O H) 2 composite material by 0. 3 kj/ m 2, the bend modulus about 30 %, and the retardant degree is enhanced to V 0 from V 1. The tensile strength of the composite material surface modified with silane FR break of the material are not improved by both silane. 693 can be increased 1 MPa. The bending strength and elongation at Key words : brucite ; magnesium hydroxide ; surface modification ; silane coupling agent ; polypropylene, : : : (1976 ),, : (1956 ),,,, Received date : Approved date : First author : DU Gaoxiang (1976 ), male,postgraduate student for E doctor degree. mail : com Correspondent author : ZHENG Shuilin(1956 ), male, doctor, professor. E mail : com. cn

2 ,, [ 1,2 ],,, 6 cm, 5 ml,, [3 ], PP/ (, ) : PP 100 [4,5 ] ; 0. 3 ; 120 ; PP PP/ : PP, 100 ;, 0. 3 (polypropylene,pp) ;,5 : 1 PP/, 1. 1 ( scanning elect ro n micro scope, SEM) :MgO % ; CaO % ; SiO % ; Fe2 O3, KBr % ; %, Fourier ( Fourier transfer A 174 inf rared, F TIR) SEM FR 693,,, 1. 2 Fourier, WQ F 410, 2, S 450,, SHL ,, IS75PN II ,,, Stanto n Red2 croft, Tarlin Scientific [6 ] 80 1,CZF 2,,XJ 300A,,D LL 10000, g/ L, A 174,FR 693, 50 min, g, 50 ml 10 min, 25 ml, PP 1, PP/ Fig. 1 Effect of dosages of silane on the settling time of brucite powder in kerosene

3 33 5 : 661 ( ) d50 = m, d97 = m 1, 2, 2, A %, h h, ; FR %, 2 Fig. 2 Effect of surface modified temperatures on the h, set2 tling time of brucite powder in kerosene, A 174 FR % 1. 0 % Mass ratio of silane to brucite : A 174,1. 5 % ; FR 693, , 2. 2 PP 2 A 174,FR 693 [7 ], PP, 1. 5 % 1. 0 % PP 120 %, d50 = m, d97 = 1. 5 m PP/, 2 PP, 1 PP 1. 2 d50 = m, d97 = m 1,, PP/ 80,A 174 FR 693, 3 % 2 1, kj / m 2,,, 30 % 2, PP/ 80 FR 693 Material Izod impact strength/ (kj m - 2 ) 1. 0 % 1 PP/ Table 1 Mechanics and f ire2retardant properties of PP/ brucite composite materials Tensile strength/ MPa Elongation at break/ % Bending strengt h/ MPa Bending modulus/ MPa Oxygen index/ % Melted drops when burning Smoking situation when burning UL94 retardant degree PP (pure) > Many Thick smoke Less PP/ brucite (non2 modified) PP/ brucite (modified by A 174) PP/ brucite (modified by FR 693) PP/ brucite (MA GNIFIN H10) No Little smoke V No No V No No V No No V 0 Note : The izod impact strength of materials is measured according to the standard of GB/ T , tensile strength and elongation at break according to the standard of GB/ T , bend properties according to the standard of GB/ T The oxygen index is measured according to the standard of AST2 MD 2863 and the UL94 retardant degree according to the standard of ANSI/ UL The melted drops and smoking situation are obtained by observa2 tion when the materials are burning. MA GNIFIN H10 is a kind of brucite products of MARTIN Co. Ltd.

4 PP/ 1 MPa, A Martin, 1,, PP , V 1,, PP ,, V 1 V 0,,, SEM, 2 SEM, 3 3,, SEM 2,,,,,, 3 SEM, Fig. 3 SEM ( scanning electron microscope) photographs F TIR 2 of brucite powders, 2 F TIR cm cm - 1, 4 4, cm - 1 OH, cm - 1 ; cm - 1 ;450 cm - 1 Mg O 4 F TIR cm - 1 CO3 2 -,, 2, CO cm - 1 OCH cm - 1,

5 33 5 : FTIR Fig. 4 FTIR spectra of brucite powders modified by siliane coupling agent s 1 Sample of non2modification ; 2 Sample modified by A ; 3 Sample modified by FR F TIR, cm cm - 1, cm PP/ SEM cm - 1, Fig. 5 SEM photographs of PP/ brucite composite mate2, rials Si O Mg PP SEM F TIR,, PP, 2 PP 5. 0 % PP, : SEM, 5 5a, PP, PP, PP 100 m, PP, 3 5a PP (1) A 174 FR 693,, PP 5b, PP PP, :A 174 FR 693

6 % 1. 0 %, 80 (2) A 174 FR 693 PP/ FR MPa, A PP/ : [1 ] WEBER M. Mineral flame retardant s overview and future trends[j ]. Ind Miner, 2000 (2) : [ 2 ],,. ogy, , [J ]., 2002, 25 ( ) : DU Gaoxiang, ZHEN G Shuilin, L I Yang. Non2Met Miner (in Chinese), 2002, 25 (suppl) : [3 ]. [J ].,1996 (2) : LU Kaijun. J Miner Protection Use (in Chinese), 1996 ( 2) : [ 4 ]. [J ].,1997,26 (1) :5 9. GUO Ruxin. Sea Salt Lake Chem Technol (in Chinese),1997, 26 (1) :5 9. [ 5 ],,,. [J ]., 2001, 20 (5) : NI Zhongbin, CHEN Mingqing, YAN G Cheng, et al. J Wuxi Light Ind Univ(in Chinese), 2001, 20 (5) : [ 6 ]. [ D]. :, , DU Gaoxiang. The preparation of super2fine and surface modi2 fied brucite powder filler used as a kind of fire2retardant (in Chinese, dissertation). Beijing : Beijing University of Technol2 [ 7 ],,,. ( REC) PP/ Mg (O H) 2 [J ]., 2001, 10 : FEN G Jiachun, CHEN Mingcai, ZHAN G Xiuju, et al. Chin Plast (in Chinese), 2001,10 : ( 1957 ) Journal of the Chinese Ceramic Society Vol. 33, No. 5, May, 2005 (monthly, started in 1957) : : Sponsor : The Chinese Ceramic Society Editor in Chief : GAN Fuxi : Responsible Editors : CH EN Tianpeng ; YU Baoting : ; Edited and Published by Editorial Department of Journal of the :, Chinese Ceramic Society : (010) ; : (010) E mail com E mail com : Http :/ / www. ceramsoc. com ; : : ( 399, ) ISSN : CN / TQ Responsible Institution : China Association for Science and Technology Baiwanzhuang, Beijing , China Tel : (010) ; Fax : (010) Overseas Distributed by gsyxb. periodicals. net. cn ; gxyb. chinajournal. net. cn China International Book Trading Corporation ( P. O. Box 399, Beijing , China) : BM

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