Flame retardancy effect of surface-modified metal hydroxides on linear low density polyethylene  

作　　者：孔祥建 刘述梅 赵建青 

机构地区：[1]College of Materials Science and Engineering,South China University of Technology [2]The Key Laboratory of Polymer Processing Engineering of Ministry of Education,South China University of Technology

出　　处：《Journal of Central South University of Technology》2008年第6期779-785,共7页中南工业大学学报（英文版）

基　　金：Project(20574020) supported by the National Natural Science Foundation of China;Project(20061001) supported by the Opening Project of the Key Laboratory of Polymer Processing Engineering, Ministry of Education, China;Project (20060106-2) supported by Guangdong Key Projects

摘　　要：Metal hydroxides （MAH） consisting of magnesium hydroxide and aluminum hydroxide with a mass ratio of 1：2 were surface-modified by y-diethoxyphosphorous ester propyldiethoxymethylsilane, boric acid and diphenylsilanediol in xylene under dibutyl tin dilaurate catalyst at 140 ℃. Phosphorus, silicon and boron elements covalently bonded to metal hydroxide particles were detected by X-ray photoelectron spectroscopy. The degradation behavior of the surface-modified MAH was characterized by thermogravimetric analysis. The results show that linear low density polyethylene （LLDPE） composite, filled with 50% （mass fraction） of MAH modified by 5.0% （mass fraction） of modifiers, passes the V-0 rating of UL-94 test and shows the limited oxygen index of 34%, and its heat release rate and average effective heat combustion in a cone calorimeter measurement decrease obviously; The mechanical properties of MAH can be improved by surface-modification. The uniform dispersion of particles and strong interfacial bonding between particles and matrix are obtained.Metal hydroxides (MAH) consisting of magnesium hydroxide and aluminum hydroxide with a mass ratio of 1-2 were surface-modified by γ-diethoxyphosphorous ester propyldiethoxymethylsilane, boric acid and diphenylsilanediol in xylene under dibutyl tin dilaurate catalyst at 140 ℃. Phosphorus, silicon and boron elements covalently bonded to metal hydroxide particles were detected by X-ray photoelectron spectroscopy. The degradation behavior of the surface-modified MAH was characterized by thermogravimetric analysis. The results show that linear low density polyethylene (LLDPE) composite, filled with 50% (mass fraction) of MAH modified by 5.0% (mass fraction) of modifiers, passes the V-0 rating of UL-94 test and shows the limited oxygen index of 34%, and its heat release rate and average effective heat combustion in a cone calorimeter measurement decrease obviously; The mechanical properties of MAH can be improved by surface-modification. The uniform dispersion of particles and strong interfacial bonding between particles and matrix are obtained.

关 键 词：metal hydroxides linear low density polyethylene （LLDPE） synergistic flame retardancy effect SURFACE-MODIFICATION 

分 类 号：O632.12[理学—高分子化学]