• Title, Summary, Keyword: Retardent

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Characteristics of Flame Retardent and Mothproof Conservation of Microwave Heated wood (마이크로파 가열 목재의 방염·방충 복합 보존처리 특성)

  • Kim, Chong-Gun;Park, Cheul-Woo;Yoon, Tae-Ho;Lim, Nam-Gi
    • Journal of the Korean Wood Science and Technology
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    • v.41 no.3
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    • pp.234-246
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    • 2013
  • It was found that test piece heated rapidly by 3 kW microwave for 5 minutes satisfies the targeted temperature and the percentage of moisture content, and the highest rate of weight increase is obtained in case of 120 minute immersion in the mixture of phosphates and heterocyclic compounds, from the result of such analysis as: kiln drying schedule, flame retardent by flammability test, insect resistance by termites, and permeability of combined penetrant for the wood after assigning multifunctional finish by immersing conifer structural frame, which is used for the frame work of wooden house and indoor/outdoor finishing in flame retardant and insect repellent materials mixture with the remaining heat of microwave. In addition, after a test of flame retardent treated item, it was identified that every mixture of phosphates corresponds with the standards of flame retardent, and upon investigation of moritality of 7 days after putting termites, it was showed that test piece immersed in the mixture of phosphates and heterocyclic compounds has the best characteristics, showing over 96% of high moritality. From the analysis of inward permeability of combined penetrant for the wood, it was decided that excellent performance in the flame retardent and insect resistance of the wood revealed due to full penetration of combined penetrant as it was found that combined penetrant penetrated through the whole inner cells of the wood.

Study of the improvement program for fire safety of FRP vessel (FRP선박의 화재안전성 개선방안 연구)

  • Gang, Byeong-Jae;Lee, Hui-Jun
    • Journal of Korea Ship Safrty Technology Authority
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    • pp.4-18
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    • 2007
  • The purpose of this study is to improve the fire safety characteristic of the FRP vessel. In this study, we analyzed the fire accidents of FRP vessel and investigated the ruels of domestic and other country for the structural fire protection standard of FRP vessel. We suggested the fire-retardent resin quality standard, and the improvement program for fire safety of FRP vessel.

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The Flame Retardent and Electric Properties of Silicone Rubber (실리콘 고무의 내화 및 전기특성)

  • Hong, Sung-Ryool;Lee, Sung-Ill;Kim, Gui-Yeul;Jang, Kyung-Uk;Lee, Won-Jae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.69-71
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    • 2003
  • Mechanical Properties, such as tensile strength, elongation, and tear strength, decreased according to increasing the load of ATH, volume resistivity, AC break down strength, and tracking resistance for HVI SC contained ATH treated by vinyl Silane were better than those for HVI SC were contained ATH treated by other surface treatment agent, such as stearic acid and acryl silane.

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Study on the Flame Retardation and Thermal Resistance for CPE Rubber Material Added Etching By-product of Aluminum (알루미늄 엣칭부산물을 첨가한 CPE 고무재료의 난연성 및 내열성 연구)

  • Kim, Kyung Hwan;Lee, Chang Seop
    • Journal of the Korean Chemical Society
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    • v.45 no.4
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    • pp.341-350
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    • 2001
  • Aluminum Hydroxide was employed as a thermal retardent and flame retardent for Chloropolyethylene (CPE) rubbery materials which is the construction material of automotive oil cooler hose. and then cure characteristics, physical properties, thermal resistance and flame retardation of compounded rubber were investigated, and optimum mixing conditions of rubber and flame retarding agent were deduced from the experimental results. CPE rubber material which has excellent properties of chemical corrosion resistance and cold resistance and inexpensive in price was used to prepare rubber specimen. The by-product of ething, produced from the process of surface treatment of aluminum was processed to aluminum hydroxide via crushing and purification, which is characterized by XRD, PSA, SEM and ICP-AES techniques in terms of phase, size, distribution, morphology and components of particles and then mixed to CPE rubber materials in the range of 0~80 phr. Hardness, tensile strength, elongation and thermal properties of compounded rubber specimens were tested. The optimum mixing ratio of rubber to additives to give maximum effect on thermal resistance and flame retardation, within the range of tolerable specification for rubber materials, was determined to be 40 phr. The flame retardation of CPE rubber materials was found to be increased by 5 times at this mixing ratio.

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Effects of a Growth Retardent Paclobutrazol on the Oil, Protein Content and Fatty Acid Composition of Peanut(Archis hypogea L.) (생장조정제(生長調整劑) Paclobutrazol이 땅콩의 유분(油分) 및 단백질함량(蛋白質含量)과 지방산(脂肪酸) 조성(組成)에 미치는 영향(影響))

  • Lee, Hyo-Sung
    • Korean Journal of Weed Science
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    • v.9 no.3
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    • pp.250-261
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    • 1989
  • This study was conducted to evaluate the effect of retardent Paclobutrazol on the seed quality factors such as oil content, protein content and fatty acid composition in peanut cv. Saeddle(early variety) and Napung(medium variety). The results are summarized as follows : Oil content of seed was appeared to increase when Paclobutrazol was applied and especially it was remarkably increased at 120 ppm-90 DAS both in varieties. Even though protein content showed a little increase at 120 ppm-70 DAS in early variety and 120 ppm -90 DAS in medium variety, however, it was decreased in most case. Saturated fatty acids such as palmitic and stearic acid was reduced by Paclobutrazol treatment but unsaturated fatty acids such as oleic, linoleic, eicosenoic and eicosadienoic acid was tended to increase in early variety while palmitic acid was increased in medium variety but linoleic acid reduced and no change was observed in oleic acid content.

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Study on the Preparation of the Phosphoric Flame retardent for the EMC (EMC용 반응형 인계 난연 수지 개발)

  • Ahn, Tae-Kwang;Kim, Han-Byung;Ryu, Kum-Sook
    • Proceedings of the KAIS Fall Conference
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    • pp.372-375
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    • 2009
  • 반도체 봉지재란 실리콘 칩, 골드와이어, 리드프레임 등의 반도체 소지를 열, 수분, 충격으로부터 보호하기 위해 밀봉하는 재료로서 EMC(Epoxy Moding Compound)가 가장 많이 쓰인다. EMC는 기계적, 전기적 성능향상을 위한 무기재료로 실리카(Silica), 열에 의해 경화되어 3차원 경화구조를 형성하는 에폭시수지, 빠른 경화특성을 부여하기 위한 경화제로서의 페놀수지, 유기재료와 무기재료 사이의 결합력을 높이기 위해 커플링제, 카본블랙, 이형성 확보를 위한 왁스(Wax), 착색제(Colorant), 난연제(Flame Retardant)등의 첨가제로 구성되는 복합소재로써 본 연구에서는 에폭시의 유형에 따른 용융 실리카를 주충진재로 하여 각각의 봉지재의 첨가제를 기준으로 할 때 다양한 형태의 친환경 비할로겐계 반응형 난연제를 합성하는 기술을 개발하고 비 할로겐계 및 Sb 계 첨가형 난연제의 혼용 배합을 통해 친환경 EMC용 난연제의 제조기술을 개발하였다. 이들 EMC의 요구특성은 요구특성은 외부환경으로부터 칩 보호, 칩을 전기적으로 절연특성 유지, 칩의 작동시 발생되는 열의 효과적인 방출 특성 유지, 실장(Board Mounting)의 간편성 특성을 확보해야 하는 특성을 지니고 있어 이들 요구특성에 적합한 특성조사가 함께 이루어졌다.

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Control of Enzymatic Degradability of Biodegradable Polylactide by Blending with Non-degradable Polymers (비 분해성고분자와 블렌드를 이용한 생분해성 폴리유산의 효소분해속도 조절)

  • Jang, Seong-Ho;Park, Sang-Bo;Lee, Won-Ki
    • Journal of Environmental Science International
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    • v.19 no.9
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    • pp.1161-1167
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    • 2010
  • The effects of addition of non degradable polymers, polystyrene (PS) and poly(methyl methacrylate) (PMMA) on the rate of enzymatic degradation of biodegradable poly(l-lactide) (PLLA) have been studied in term of surface structure. Since a component in multicomponent polymeric system has shown surface enrichment, PS and PMMA which have lower surface energy than PLLA were selected as a minor blend component (5 wt%). Enzymatic degradation was carried out at $37^{\circ}C$ and pH 8.5 in the aqueous solution of Proteinase K. Two blend systems, partially miscible (PS/PLLA) and immiscible (PMMA/PLLA), showed the surface enrichment of 4 and 2 times of PS and PMMA, respectively. From the weight loss profile data, the slow degradation rate of both blend films was observed. This indicates that PS or PMMA domains which exist at surface act as a retardant of enzymatic attack.

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.