Reaction of Cyanoguanidine with Formaldehyde. V. Properties of Cyanoguanidine-Formaldehyde Resin as a Coagulating Agent of Anionic Colloidal Particles.

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概要

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• The coagulation of anionic colloidal particles by the cyanoguanidine (CG)–formaldehyde resin has been reported to be caused by an electrostatic interaction of the (diaminomethylene)urea (DU) cation with an anionic surface charge of particles. Our results show that neither DU·HCl nor di-hydrochlorides of <I>N</I>,<I>N</I>′-methylenebis [<I>N</I>′-(diaminomethylene)urea] (Bis-DU·2HCl), itself, nor the resinous products of DU·HCl or Bis-DU·2HCl with formaldehyde, are such effective coagulating agents as the CG–formaldehyde resin and are not explicable only in terms of the electrostatic interaction. Gel-permeation chromatograms of the resins have revealed that the coagulation efficiency increased in proportion to the increase of the fraction of components having higher molecular weight, suggesting that components having higher molecular weight play an important role in coagulation due to the CG–formaldehyde resin.

• 公益社団法人 日本化学会の論文

著者

• Ebisuno Toichi

  Department Of Chemistry Faculty Of Science Toho University

• Shiba Ryuichi

  Department Of Materials And Life Sciences Graduate School Of Advanced Science & Technology Tokyo

• Takimoto Michiaki

  Department Of Chemistry Faculty Of Science Toho University

• Takahashi Miyuki

  Department of Applied Science, Faculty of Technology, Tokyo Denki University

• Shindou Yoichi

  Department of Chemistry, Faculty of Science, Toho University

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