• 한국산업보건학회지
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• 제26권4호
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• pp.396-403
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• 2016

Objectives: The study is to evaluate biological monitoring and risk assessment for epichlorohydrin-bisphenol A resin exposed from waterproofing or finishing work in the apartment building construction. Methods: Subjected workers were working on spray-painting and waterproofing work for 8 hours per day every 20 days. The urine samples were collected at the end of 20 days working period. For urinary bisphenol A as metabolite from epichlorohydrin-bisphenol A exposure, urine samples were analyzed with liquid chromatography mass-mass spectrometry(HPLC-MS/MS). Results: Geometric means of urinary bisphenol A(BPA) with no hydrolysis and with enzymic hydrolysis(BPA-EH) in the workers were $1.10{\mu}g/L$ and $2.90{\mu}g/L$. BPA-EH was 4 times higher than that of control group. The factors for working period and ages did not affect the variation of BPA and BPA-EH. The levels for BPA and BPA-EH were not higher than 95th percentile for exposure on human-life environment. Conclusions: The BPA and BPA-EH were therefore effective biological markers for epichlorohydrin-bisphenol A exposure workers, but not seem to hazardous exposure level. Waterproofing work in construction workshop is required to measuring work environment and health care management for the workers.

• 폴리머
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• 제37권6호
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• pp.730-735
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• 2013

제지 공정에 있어서 지력 증강제로 사용되는 polyamide-epichlorohydrin(PAE)를 함유한 폴리비닐알코올(PVA)의 물성을 살펴보았다. PAE 첨가로 인하여 PVA의 용융과 결정화 열량이 감소될 뿐만 아니라 X-ray 결정 피크의 면적이 감소되는 것으로 보아 PAE에 의하여 PVA 가교가 진행됨을 알 수 있었다. 이러한 현상은 가수화도가 높은 PVA의 경우 더 두드러짐을 확인하였다. 하지만, 열처리에 의하여 PVA의 결정화가 일어나는 것으로 보아 PAE에 의한 PVA의 가교는 화학적 가교보다는 상대적으로 결합력이 약한 물리적 가교임을 알 수 있었다. PAE에 의한 PVA의 가교 및 결정화는 PVA의 열안정성, 기계적 강도를 증가시켜 이를 제지 공정의 지력 증강제로 사용할 경우, 종이의 건조 및 젖음 지력 향상에 효과가 있음을 알 수 있었다.

• 패션비즈니스
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• 제8권1호
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• pp.156-163
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• 2004

The purpose of this study is to investigate the change of handle when cotton fabric is treated with chitosan-polyurethane mixed solution and crosslinked with epichlorohydrin in order to form three-dimensional crosslinks in the molecules, which in turn would improve the wash-fastness of the chitosan-treated fabrics. The application of epichlorohydrin decreased the EM(Tensile extensibility) and WT(Tensile energy) values, indicating the stiffness increased in the treated fabrics due to the 3-dimensional crosslinking. The crosslinking of the cotton fabric samples resulted in the increase in T.H.V. effectively for the use of summer dress shirt fabric.

• Bulletin of the Korean Chemical Society
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• 제31권8호
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• pp.2272-2278
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• 2010

A new hybrid thermosetting maleimido epoxy compound 4-(N-maleimidophenyl) glycidylether (N-MPGE) is prepared by reacting N-(4-hydroxyphenyl) maleimide (HPM) with Epichlorohydrin by using benzyltrimethylammonium chloride as a catalyst. The resulting compound possesses both the oxirane ring and maleimide group. The curing reaction of these maleimidophenyl glycidylether epoxy compound (N-MPGE) with amines as curing agents such as ethylendiamine (EDA), diethylentriamine (DETA) and triethylenetetramine (TETA), aminoethylpiperazine (AEP) and isophoronediamine, IPDA), are studied. Incorporation of maleimide groups in the epichlorohydrin provides cyclic imide structure and high cross-linking density to the cured resins. The cured samples exhibited good thermal stability, excellent chemical (acid/alkali/solvent) and water absorption resistance. Morphological studies by the SEM technique further confirmed the phase homogeneity net work of the cured systems.

• 폴리머
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• 제24권3호
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• pp.358-365
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• 2000

Miscibility itnd thermal behavior of blends of synthetic biodegradable aliphatic polyester (Bionolle) with poly(epichlorohydrin) (PECH) were investigated by a differential scanning calorimetry (DSC), a dynamic mechanical thermal analyzer (DMTA) and a rotational rheometer. Observed both single glass transition temperatures from the DSC in agreement with the Fox equation and single T$_{g}$ changes as a function of composition from the DMTA indicate that these blend mixtures are miscible. In addition, the miscibility of this blend system was also observed from the single curve of the Cole-Cole Plot of log G′($\omega$) vs. log C"($\omega$) from the dynamic test using a rotational rheometer. This was further verified from the cryogenically fractured surface of BDP/PECH blends by scanning electron microscopy.

• Bulletin of the Korean Chemical Society
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• 제34권2호
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• pp.641-644
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• 2013

• Elastomers and Composites
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• 제15권1호
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• pp.13-26
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• 1980

• Elastomers and Composites
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• 제21권3호
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• pp.226-247
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• 1986

• Toxicological Research
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• 제25권4호
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• pp.203-207
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• 2009

Present study was conducted to investigate potential effects of epichlorohydrin on testicular and epididymal function in male rats. The test chemical was administered to adult male rats by gavage at dose levels of 0, 3.125, 12.5, and 50 mg/kg/day for 7 days. Testicular and epididymal function were assessed by measurement of reproductive organ weight, testicular spermatid count, epididymal sperm count, motility and morphology, and histopathology in rats. At 50 mg/kg, a decrease in the sperm motility and an increase in the incidence of sperm abnormalities were observed. Histopathological examinations revealed an increase in the incidence of histopathological changes including cell debris in the ducts, vacuolization of the epithelial cells, oligospermia, and epithelial disruption in the proximal caput epididymidis. At 12.5 mg/kg, an increase in the incidence of histopathological changes of the epididymidis was found. There were no treatment-related effects at 3.125 mg/kg. These results show that 7-day repeated oral administration of epichlorohydrin to male rats results in adverse effects on sperm motility, sperm morphology, and epididymal histology at $\geq$ 12.5 mg/kg/day.

• 접착 및 계면
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• 제12권2호
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• pp.73-80
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• 2011

식물성 고분자인 대두단백질을 기반으로 하는 환경친화성 고분자 신소재에 관한 연구를 위해 가소제(1,3-propandiol, glycerol) 및 가교제(glutaraldehyde, epichlorohydrin, glyoxal, urea)에 의한 대두단백질 수지의 열적 특성을 TGA를 이용하여 분석하였고, 기계적 특성 분석과 SEM을 통하여 파단면을 관찰하였다. 그 결과, 가소제인 1,3-propandiol과 glycerol을 SPI (대두단백질)에 첨가함으로써 수지의 유연성이 증가하였고, 1,3-propandiol에 비하여 glycerol의 가소화 효과가 상대적으로 크게 나타났으며, 가교제인 glycerol, epichlorohydrin, glyoxal의 적용으로 첨가량이 증가할수록 대두단백질 수지의 강도와 열안정성이 증가하는 반면, urea의 경우, 대두단백과의 가교가 용이하지 않아 열안정성이 오히려 낮아지고, 강도가 감소함을 알 수 있었다.