逆相分配クロマトグラフィーによる尿素樹脂中の未反応尿素の定量法

概要

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Free urea, monomethylol urea, dimethylol urea and methylene diurea in urea-formaldehyde resins (UFR) were separated by reversed phase partition chromatography.<BR>The analyical condition were as follows : 20 μ1 of w/v % aqueous sample solution was injected to liquid chromatograph equipped with UV detector using a column packed with Hitachi Gel 3011-0 which is porous polystyrene gel with hydroxyl end group. column size; 8 mm in diameter, 10 cm in length, detective wave length; 195 nm, eluent; water, flow rate; 1 ml/min.<BR>An elution volume of urea peak was about 4.5 min. The amount of free urea was determined from peak area correspponding to urea with a reproducibility of 2.2 % as the coefficient of variation, The precision of the present method was comparable to that by gel chromatography using column packed with Sephadex LH-20 with dimethylformamide as an eluent.<BR>This chromatographic procedure took about 20 min.<BR>It was found that the elution volume of monomethylol urea is larger than that of dimethylol urea and the content of dimethylol urea in UFR prepared under the condition that the molar feed ratio of formaldehyde (F) /urea (U) =2/1 is larger than that in UFR prepared that F/U=1.5/1.
Japan Thermosetting Plastics Industry Associationの論文