• 월간포장계
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• 통권363호
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• pp.50-52
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• 2023

• Composites Research
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• 제32권6호
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• pp.368-374
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• 2019

무기필러가 첨가된 현무암섬유 강화 에폭시 복합재료를 제조하여 그 특성을 평가하였다. 첨가된 무기필러는 각각 수산화마그네슘, 수산화알루미늄, 알루미나, 베마이트이며 이를 첨가제로한 에폭시 수지를 현무암섬유에 핸드레이업으로 함침시킨 후 hot pressing하여 수지 함침량이 30 wt%인 섬유복합재료를 제조하였다. LOI 평가 결과 BFRP의 LOI (28.9)는 에폭시 수지 (21.4)에 비해 향상된 것을 확인하였으며 무기필러가 첨가될 경우 그보다 더욱 향상되는 것을 확인하였다. 또한 무기필러가 첨가된 복합재료는 무기필러가 첨가되지 않은 복합재료에 비해 콘칼로리미터 시험에서 PHRR, THR, TSR 등이 감소하여 무기필러 첨가에 따른 난연 특성 향상을 확인하였다.

• Carbon letters
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• 제17권1호
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• pp.74-78
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• 2016

• 한국산학기술학회논문지
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• 제13권3호
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• pp.955-960
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• 2012

본 연구는 순수 Polyurethane과 일반적인 난연제인 $Al(OH)_3$ 및 $Mg(OH)_2$를 첨가한 sample과 Cloisite Na+, Cloisite 15A를 첨가한 sample의 난연성 및 기계적 특성을 비교하였다. 또한 Sodium silicate와 Polyurethane을 혼합한 것에 경량성 충진제인 Vermiculite, Perlite를 충진한 sample의 난연성 및 기계적 특성을 확인하였다. 그 결과, Cloisite Na+와 Cloisite 15A를 첨가한 sample과 Sodium silicate를 혼합한 sample에서 난연제를 첨가한 것과 같은 등급의 난연성을 확인하였다. 인장강도는 filler의 양이 증가함에 따라 저하 되었으나, sodium silicate를 첨가한 sample의 경우 다른 sample 보다 강도가 향상됨을 확인하였다.

• 한국안전학회지
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• 제21권1호
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• pp.65-71
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• 2006

Flame retardancy and mechanical properties of polyolefinic mixed waste plastics/filler composites were investigated by using inorganic flame retardant(magnesium hydroxide) and PUB(polyurethane block) powder generated from cryogenic insulation process. All composites were obtained by extrusion and after compression molding. The effect of PUB powder on the properties of the composites was studied by tensile and izod impact test, morphology studies and flammability as LOI and UL94 vertical burning test and smoke density. The objective of this work is to obtain good mechanical properties from recycled PP composites with $Mg(OH)_{2}/PUB$ powder as fillers and optimum cost-performance balance, in addition to flame retardant characteristics.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 2007년도 춘계학술논문발표회 논문집
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• pp.223-229
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• 2007

• 한국안전학회지
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• 제21권1호
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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.

• 한국안전학회지
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• 제18권2호
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• pp.56-63
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• 2003

Flame retardancy and mechanical properties of recycled polyolefinic plastics/inorganic filler composite systems were investigated by using several inorganic flame retardants such as magnesium hydroxide and slag powder generated electro arc furnace Compatibilizer user each maleic anhydride functionalized polyethylene (PE-g-MAH) and polypropylene(PP-g-MAH) or used mixture of these. The effect of polymeric compatibilizers on the properties of composites was studied by tensile and impact test, differential scanning calorimetry, in the changed fracture mechanism. The improved adhesion was particularly reflected in the mechanical properties. The flame retardancy of composites was examined by measuring limiting oxygen index(LOI, ASTM D2863), smoke density(ASTM D2843) and vertical burning test(UL94). Regarding the flame retardant effect, the EAF slag powder is behaving as synergists as they are only active in the presence of magnesium hydroxide.

• 자원리싸이클링
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• 제16권4호
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• pp.17-26
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• 2007

재활용한 폴리프로필렌(재활용 COPP, 이하 COPP)에 무기계 폐기물인 패각을 도입하여 함량 변화에 따른 기계적 물성 및 난연성을 조사하였다. 상기 복합소재의 기계적 물성 향상을 위하여 상용화제(Polytail H)를 첨가하였고, 난연성 향상을 위하여 다양한 종류의 난연제($Al_2O_3$, DBDPO, $Sb_2O_3$)를 첨가하여 이에 따른 기계적 물성 및 난연성을 종합적으로 평가하였다. 측정 결과 재활용 COPP에 패각만 혼합하는 것보다는 추가적으로 상용화제를 혼합하는 것이 매트릭스인 폴리프로필렌과 패각과의 계면 결합력이 증대되어 패각만을 혼합하였을 때 보다 물성저하가 감소하였고, 충격강도의 경우는 100 wt% 재활용 폴리프로필렌(COPP)과 유사한 값을 나타내었다. 한편, 난연제 첨가에 따른 기계적 물성의 저하는 관찰되지 않았다. 제조된 재활용 COPP 복합소재의 UL-94규격에 의한 난연 테스트 결과 패각만을 혼합한 경우 패각 40 wt% 함유된 경우가 pure COPP보다 불이 붙을 때까지 걸리는 시간과 타는 시간이 지연됨을 확인할 수 있었지만, 난연 효과는 나타나지 않았다. 그러나, 패각을 난연제와 함께 복합화하여 제조한 소재에서는 뚜렷한 난연 효과를 관찰할 수 있었으며, 난연 효과는 $Sb_2O_3>Al_2O_3>DBDPO$의 순으로 효과가 있음을 확인하였다. UL-94 V-0 등급은 $Al_2O_3$를 첨가한 그레이드 중 상용화제를 넣은 그레이드와 패각 40 wt%가 함유된 그레이드에서, 그리고 $Sb_2O_3$를 난연제로 사용한 모든 그레이드에서 관찰되었다.

• 한국안전학회지
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• 제24권6호
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• pp.63-71
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• 2009

In order to improve flame retardancy, the halogen free organic melamine phosphate(M-P) flame retardant was synthesized from melamine and phosphoric acid by the reaction of precipitation. The ignition test was carried out preparing hybrid flame retardant compound($H_bFRC$) consisting of organic M-P and inorganic Mg$(OH)_2$ as a flame retardant in the polyolefin resins. The flame retardancy and mechanical properties of flame retardant aluminum composite panel($H_bFRC$-ACP) were performed to investigate the possibility of the composite material, which was contained M-P, as a inner core for $H_bFRC$-ACP. For this study, the results of ignition test indicate that a char formation and drip suppressing effect, and combustion time reduced as the content of M-P increased. The limited oxygen index(LOI) values were measured 17.4vol% and 31.5vol% for LDPE only and $H_bFRC$-3(M-P content: 15wt%), respectively. And it was verified that the $H_bFRC$-3 was needed more oxygen quantity with the increase of M-P content when it combustion. Also, the results from thermogravimetric analysis were observed endothermic peak at $350^{\circ}C$ and $550^{\circ}C$, it was confirmed predominant thermal stability though the wide temperature range by the mixture of M-P and Mg$(OH)_2$. The LDPE-ACP (using only LDPE as a inner core), $35.13kW/m^2$ of heat release rate(HRR) and 13.43MJ/m2 of total heat release(THR) were measured while the $H_bFRC$-ACP, $10.44kW/m^2$ of HRR and 1.84MJ/m2 of THR were measured by results of cone calorimeter test. In case of $H_bFRC$-ACP, the average gas emission amount of CO and $CO_2$ could be decreased down to 25% and 20%, respectively, in comparison with LDPE-ACP. The mechanical properties such as tensile strength, bending strength and adhesion strength of $H_bFRC$-ACP were revealed slightly high values $54N/mm^2$, $152N/mm^2$ and 120N/25mm, respectively, compared with LDPE-ACP. It was confirmed that flame retardancy was improved with the synergy effect because of char formation by M-P and hydrolysis by Mg$(OH)_2$. The result of this study suggest that $H_bFRC$ can be applied for an adequate halogen free flame retardant composite material as a inner core for ACP.