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박창무(Park Chang Moo),최성옥(Choi Seung Ok),정노희(Jeong Noh Hee) 한국유화학회 2009 한국응용과학기술학회지 Vol.27 No.4
Polyurethane adhesive is used in various fields as flexible packaging materials including a food packaging field. Therefore, the purpose of this study is synthesis of polyurethane adhesive which uses aliphatic isocyanate, and compares with aromatic isocyanate. The isocyanates for this test are toluene-2,4-diisocyanate(TDI), hexamethylene diisocyanate(HDI), 4,4-dicyclohexyl ethane diisocyanate(H12MDI), and isophorone diisocyanate(IPDI). And, the effect of any other diisocyanate are evaluated by several methods as for curing rate test, accelerate weathering test, and peel strength test. The polyurethane adhesive using curing catalyst and HDI has adhesion strength of about 560 g/15 mm between aluminium foil and nylon, about 1,520 g/15 mm between nylon and CPP. Those parameters are similar to polyurethane adhesive with TDI. Also, in case of curing rate, those are similar to TDI type polyurethane adhesive. Moreover, data of △E as color variation by QUV tester is equal to 4.12, as 48% against those of TDI type.
박창무 ( Chang Moo Park ),최성옥 ( Seung Ok Choi ),정노희 ( Noh Hee Jeong ) 한국유화학회 2010 한국응용과학기술학회지 Vol.27 No.4
Polyurethane adhesive is used in various fields as flexible packaging materials including a food packaging field. Therefore, the purpose of this study is synthesis of polyurethane adhesive which uses aliphatic isocyanate, and compares with aromatic isocyanate. The isocyanates for this test are toluene-2,4-diisocyanate(TDI), hexamethylene diisocyanate(HDI), 4,4-dicydohexyl ethane diisocyanate(H12MDI), and isophorone diisocyanate(IPDI). And. the effect of any other diisocyanate are evaluated by several methods as for curing rate test, accelerate weathering test, and peel strength test. The polyurethane adhesive using curing catalyst and HDI has adhesion strength of about 560 g/15 mm between aluminium foil and nylon, about 1,520 g/15 mm between nylon and CPP. Those parameters are similar to polyurethane adhesive with TDI. Also, in case of curing rate, those are similar to TDI type polyurethane adhesive. Moreover, data of ΔE as color variation by QUV tester is equal to 4.12, as 48% against those of TDI type.
GC/FID에 의한 작업환경중 메틸 이소시아네이트의 분석
이은정,유철,한영선,조영봉 한국산업위생학회 2001 한국산업보건학회지 Vol.11 No.3
The purpose of this study is the development of the simple and precise sampling and analysis method of methyl isocyanate(MIC) in the work place as their secondary aliphatic amine derivatives by gas chromatography with flame ionization detector. The urea derivatives are quantitatively and simultaneously derived from MIC with secondary aliphatic amines such as dipropylamine(DPA), dibutylamine(DBA), and dipentylamine(DDA) in methylene chloride. The method is based on sampling glass tube in XAD-2 resin which is coated with secondary aliphatic amines. The samples are desorbed by 2 ㎖ methylene chloride and analysed using gas chromatography with flame ionization detector(GC/FID). In the result, the detection limit of the overall procedure and reliable quantity are 0.020-0.027 ㎍(1.347-1.740)㎍/㎥(0.529-0.684 ppb) based on a 15 L air volume) MIC per sample. The average desorption efficiencies are 97.96 - 101.23%. The results of versus storage time are high and stable recovery rates.
최현,김정현 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
Polyurethane foams attract great attentions in various applications due to their superior materials properties. Foam structure is strongly related to the initial reaction rate of polymerization process. The effects of isocyanate (NCO) ratios between aromatic and aliphatic types on acoustic and mechanical properties were investigated. Highly electrophilic carbon atoms and less sterically hindered planar structure in aromatic NCO groups showed higher reactivity than in aliphatic nonplanar structure, and consequently the pore size and numbers decreased with increasing aliphatic contents from reduced pore formations due to high asymmetry molecular arrangements. The highest acoustic activity was also achieved at optimum aliphatic content.