The Reaction of Acetoacetylated PVA and Isocyanate Chemical Compound

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  • アセトアセチル化PVAとイソシアネート化合物との反応
  • アセトアセチルカ PVA ト イソシアネート カゴウブツ ト ノ ハンノウ

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Abstract

Using acetoacetylated (AA) PVA with various degrees of acetoacetylation and ordinary partially saponified PVA, the following facts were obtained as the result of examining the reactivity with an added isocyanate compound (pMDI) in AA PVA aqueous solution and the formation of crosslinking by heat treatment as compared with ordinary PVA.1) The rate of consuming NCO groups in the PVA aqueous solution was higher with AA PVA than with ordinary PVA. The reactivity of the AA group in AA PVA for the NCO group in pMDI was higher than that of the OH group.2) The E' value in the rubbery flat region of AA PVA was higher than that for ordinary PVA as a result of measurement of the dynamic viscoelasticity of cured films, and the temperature of the E" shoulder based on the glass transition of AA PVA was higher than that for ordinary PVA.3) The crosslinking density of PVA, which was calculated from the E' value of the rubber flat region of the cured film, increased with the degree of acetoacetylation.4) The AA PVA film cured at 120℃ for 2 hours showed a significantly decreased water solubility.5) The ability of the PVA aqueous solution to bond wood improved by the addition of pMDI. Curing at 120℃ resulted in superior waterproof adhesion for AA PVA.

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