Comparison of Magnesium Hydroxide Particles by Precipitation and Hydrothermal Treatment for Flame Retardant Application to Low Density Polyethylene and Ethylene-Co-Vinyl Acetate Resin

침전법과 수열처리로 제조된 수산화마그네슘 비교와 이의 저밀도 폴리에틸렌-에틸렌 비닐 아세테이트 수지 난연제 적용

  • Hyun, Mi Kyung (Composite Materials Lab., Korea Institute of Ceramic Engineering and Technology) ;
  • Lim, Hyung Mi (Composite Materials Lab., Korea Institute of Ceramic Engineering and Technology) ;
  • Yoon, Joonho (Composite Materials Lab., Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Dong Jin (Composite Materials Lab., Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Seung-Ho (Composite Materials Lab., Korea Institute of Ceramic Engineering and Technology) ;
  • Whang, Chin Myung (Department of Materials Science & Engineering, Inha University) ;
  • Jeong, Sang Ok (Nanotech Ceramics Co. Ltd)
  • 현미경 (요업기술원 그린세라믹본부 복합재료팀) ;
  • 임형미 (요업기술원 그린세라믹본부 복합재료팀) ;
  • 윤준호 (요업기술원 그린세라믹본부 복합재료팀) ;
  • 이동진 (요업기술원 그린세라믹본부 복합재료팀) ;
  • 이승호 (요업기술원 그린세라믹본부 복합재료팀) ;
  • 황진명 (인하대학교 세라믹공학과) ;
  • 정상옥 ((주)나노텍세라믹스)
  • Received : 2008.12.12
  • Accepted : 2009.01.27
  • Published : 2009.04.10

Abstract

$Mg(OH)_2$ particles were prepared by precipitation and a hydrothermal treatment to examine the effect of $MgCl_2$ concentration, alkali type and concentration, temperature, hydrothermal treatment on the formation of $Mg(OH)_2$ particles using full factorial design, as one of DOE (Design of experiment) methods. The primary particle size is similar to the secondary particle size for the samples after the hydrothermal treatment, where the average particle size of $Mg(OH)_2$ increased with increasing the concentration of $MgCl_2$ and hydrothermal temperature and decreasing alkali/Mg molar ratio. On the other hand, for the samples prepared from precipitation, the secondary particle size is larger than the primary particles due to aggregation. The difference in alkaline source is that the particles prepared from $NH_4OH$ exhibit the larger size with better dispersion than those from NaOH. Low density polyethylene and ethylene-co-vinyl acetate (LDPE-EVA) resin composed of the smaller secondary particle size of $Mg(OH)_2$ shows a higher limited oxygen index (LOI) at 50 and 55% loading, but the smaller primary particle size may result in a better grade in UL-94 tests. At the high loading of 60%, all samples with any preparation methods exhibit V-0 grade but the LOI value depends on not only primary particle size but also dispersion state.

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