• Title/Summary/Keyword: Flame retardancy

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A Study on the Preparation and Flame Retardancy of Compatibilized Blend/Layered Silicate Nanocomposites with Inorganic Flame Retardant (무기계난연제 첨가형 상용화블렌드/층상실리케이트 나노복합재료의 제조 및 난연특성에 관한 연구)

  • Kang, Young-Goo;Song, Jong-Hyeok
    • Journal of the Korean Society of Safety
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    • v.21 no.1 s.73
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    • pp.79-85
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    • 2006
  • Olefinic compatibilized blend(R-PP/R-PE)/layered silicate composites have been prepared by melt intercalation technique directed from $Na^{+}$ montmorillonite(MMT) or organophilic montmorillonites while using magnesium hydroxide as flame retardant. Morphology and flammability properties were characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), scanning electron microscopy(SEM), thermogravimetry analysis(TGA), limiting oxygen index(LOI), UL94 test. It is found that the compatibilized blend/layered silicate(Cloisite 20A) nanocomposites have a mixed immiscible-intercalated structure and there is better intercalation when a compatibilizer is combined with the polymer and layered silicate to be melt blended. A very large increase in the LOI value was observed with hybrid filler addition and further enhancement in thermal stability and compatibility of blend was obtained for the compatibilized blend containing small amount of layered silicate.

Flame Retardancy and Foaming Properties of the NBR/Ground Tire Rubber Foams Containing Expandable Graphite (팽창 흑연을 포함한 NBR/GTR 발포체의 난연 및 발포특성)

  • Moon Sung-Chul;Choi Jae-Kon;Jo Byung-Wook
    • Polymer(Korea)
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    • v.28 no.5
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    • pp.412-425
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    • 2004
  • The influence of expandable graphite (EG) on flame retardancy and foaming properties of the NBR/GTR foams was studied. The foaming properties were similar to those of NBR/GTR foams without EG when the EG contents were 10$\~$30 phr. The LOI values were increased with the EG content. For cone-calorimeter test, the data showed the trend similar to that from experiment. When the composition ratios of the compounds of NBR/GTR were 100$\~$0/80$\~$20 (w/w), and the EG contents were 10$\~$30 phr, we obtained high flame retardancy foams with low heat release rate (HRR), total heat release (THR), effective heat of combustion (EHC) and carbon monoxide yield (COY). The smoke density is similar to CO yield values obtained by the cone-calorimeter test. TGA analysis also showed the results approximately similar to those from the LOI and cone-calorimeter experiments.

Flame Retardancy and Physical Properties of Ethylene Vinyl Acetate/Aluminum Trihydroxide Composites (에틸렌 비닐아세테이트/수산화알루미늄 복합재료의 난연 및 물리적 특성)

  • Lee, Minho;Yu, Dayeong;Kim, Yeongho;Lee, Sunghee;Kim, Jeong Ho;Lee, Young Chul
    • Polymer(Korea)
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    • v.39 no.3
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    • pp.433-440
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    • 2015
  • Aluminum trihydroxide (ATH) has been commonly employed as a flame retardant for ethylene vinyl acetate (EVA) copolymers. In the present work, ATH was obtained from a recycling process of multi-layer packaging film wastes. EVA/ATH composite samples were prepared using a two roll-mill and flame retardancy of EVA/ATH composites were examined using limiting oxygen index (LOI) and flame retardancy test (UL94). We observed excellent flame retardancy in case of adding 150 phr or more of recycled ATH to EVA. Particle size and specific surface area play crucial roles in LOI value and UL-94 classification of the EVA/ATH composites. Smaller particle size and higher specific surface area of ATH was found out to improve the flame retardancy. Regarding tensile properties, crosslinked EVA/ATH compounds which is practically used for electric cables had similar to or even better tensile property values than the ones without ATH.

Assessment of Flame Retardancy for Acrylonitrile Butadiene Styrene Containing Metal Powder and Flame Retardant (금속분말-난연제 함유 ABS의 난연 특성 평가)

  • Song, Young-Ho;Chung, Kook-Sam
    • Fire Science and Engineering
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    • v.21 no.2 s.66
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    • pp.30-35
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    • 2007
  • The flame retardancies by the addition of metal powder and flame retardant were evaluated to present as the fundamental data to decrease the fire hazard of polymers and life losses by suffocation and poisoning. For this study, the experiments of flame retardancy were conducted as follows : weight loss rate using thermogravimetric analysis, the measurement of the limiting oxygen index(LOI) and char yield. And smoke mass concentration and CO yield were measured. Acrylonitrile butadiene styrene containing metal powder and flame retardant reduced weight loss rate and increased LOI and char yield with the decreased smoke mass concentration and CO yield. It was found that the most effective complex was tricresyl phosphate-Mo complex.

Effect of Flame Retardants on Flame Retardancy of Rigid Polyurethane Foam (난연제 종류에 따른 경질 폴리우레탄 폼의 난연 특성)

  • Kim, Keunyoung;Seo, Wonjin;Lee, Ju-Chan;Seo, Jung-Seok;Kim, Sangbum
    • Journal of the Korean Institute of Gas
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    • v.17 no.5
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    • pp.75-80
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    • 2013
  • In this study, the effect of phosphorus flame retardants on the flame retardancy of the rigid polyurethane foam(PUF) was studied. Tetramethylene bis(orthophos-phorylurea)[TBPU] and Tris(2-chloroethyl) phosphate[TCEP], Tris(2-chloropropyl)phosphate [TCPP], Triethyl phosphate[TEP] were used as flame retardant. It was found that TBPU added PUF exhibits low mean heat release rate(HRR), peak HRR, effective heat of combusion(EHC), mass loss rate (MLR), CO yield and $CO_2$ compared other flame retardants.

Preparation and Characterization of PU Flame-Retardant Coatings Using Modified Polyesters Containing Phosphorus and Chlorine (인과 염소 함유 변성폴리에스터에 의한 PU 난연도료의 제조 및 도막특성)

  • Park, Hong-Soo;Shim, Il-Woo;Jo, Hye-Jin;Hahm, Hyun-Sik;Sung, Ki-Chun
    • Journal of the Korean Applied Science and Technology
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    • v.23 no.1
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    • pp.77-84
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    • 2006
  • Modified polyesters (TTBA-10C, -20C, -30C) that contain phosphorus and chlorine were synthesized by the condensation polymerization of tetramethylene bis(orthophosphate), neohexanediol trichlorobenzoate, 1,4-butanediol and adipic acid, in which tetramethylene bis(orthophosphate) and neohexanediol trichlorobenzoate were prepared previously in our laboratory. In this study, two-component flame-retardant polyurethane coatings (TTBA-10C/HDI-trimer=TTHD-10C, TTBA-20C/ HDI-trimer= TTHD-20C, TTBA-30C/HDI-trimer= TTHD-30C) were obtained by curing at room temperature with the synthesized TTBAs and hexamethylene diisocyanate (HDI)-trimer as a curing agent. The obtained TTHDs were made into coating samples and used as test samples for various physical properties. The physical properties of the flame-retardant coatings containing chlorine and phosphorus groups were generally inferior to those containing only phosphorus group. Flame retardancy was tested by vertical and horizontal combustion method, and $45_{\circ}$ Meckel burner method. Since the retardancy of flame-retardant coatings containing chlorine and phosphorus groups was better than that containing only phosphorus group, it could be concluded that the retardancy by the synergism effect of chlorine and phosphorus groups exhibited.

Synthesis of Benzoic Acid Modified Polyester Containing Phosphorus and Their Application to PU Flame-Retardant Coatings (인 함유 벤조산 변성폴리에스테르의 합성과 이를 이용한 PU 난연도료의 도막물성 연구)

  • Park, Hong-Soo;Shim, Il-Woo;Jo, Hye-Jin;You, Hyuk-Jae;Kim, Myung-Soo;Hahm, Hyun-Sik
    • Journal of the Korean Applied Science and Technology
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    • v.22 no.2
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    • pp.123-135
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    • 2005
  • Reaction intermediates PCP/BZA (PBI) and tetramethylene bis(orthophosphate)(TBOP) were synthesized from polycaprolactone (PCP) and benzoic acid (BZA) and from pyrophosphoric acid and 1,4-butanediol, respectively. Benzoic acid modified polyesters containing phosphorus (APTB-S, -10, -15) were synthesized by polycondensation of the prepared PBI (containing 5, 10, 15wt% of benzoic acid), TBOP, adipic acid, and 1,4-butanediol. Network structured PU flame-retardant coatings (APHD) were prepared by curing the synthesized benzoic acid modified polyesters containing phosphorus (APT B - 5 , -10, -15) with hexamethylene diisocyanate (HDI)-timer. From the TGA analysis of APTBs, it was found that the afterglow decreased with the amount of BZA content at the high temperatures. With the introduction of BZA, the film viscosity and film hardness of APHD decreased. With the introduction of caprolactone group, the flexibility, impact resistance, accelerated weathering resistance of APTBs increased. Flame retardancy of the coatings was tested. In a vertical burning method, APHD shows 210$^{\sim}$313 seconds, which indicates that the coatings are good flame-retardant coatings. Moreover, the amount of afterglow and flame retardancy of the coatings are decreased with increasing BZA content.