Sodium α-hydroxyalkyl phosphinates as inhibitors of photoyellowing of high-yield pulps

J. X. Guo, Y. C. Lin, D. G. Gray

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Abstract

Previous work on sodium hydroxymethylphosphinate as an inhibitor of photoyellowing of mechanical pulps was extended to other sodium salts of α-hydroxyalkyl phosphinic acids. Sodium α-hydroxyethyl phosphinate, sodium α-hydroxybutyl phosphinate, sodium bis(α-hydroxybutyl) phosphinate, sodium (α-hydroxyl, α-methyl)ethyl phosphinate, sodium bis((α-hydroxyl, α-methyl)ethyl) phosphinate, and sodium (α-hydroxyl, α-methyl)butyl phosphinate were prepared from hypophosphorous acid and the appropriate aldehydes or ketones. The products were characterized by 31P NMR (nuclear magnetic resonance) spectroscopy. All the compounds were stable, colourless, odourless and showed some inhibition of photoyellowing on bleached chemithermomechanical pulp sheets. The primary α-hydroxyethyl phosphinate was the most effective, and the secondary bis(α-hydroxybutyl) phosphinate was the least effective in inhibiting photoyellowing. The existence of hydrogen on the carbon attached directly to the phosphorus of α-hydroxyalkyl phosphinates has a small positive effect on brightness stabilization, compared to those compounds with substitution of the hydrogen by a methyl group. The inhibition of yellowing correlated qualitatively with a decrease in the formation of chromophores around 360 nm during irradiation, as measured by diffuse reflectance UV spectrometry.

Original languageEnglish (US)
Pages (from-to)J311-J317
JournalJournal of Pulp and Paper Science
Volume23
Issue number7
StatePublished - Jul 1 1997

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Keywords

  • Bleached pulps
  • Chemithermomechanical pulps
  • Hydroxyalkyl groups
  • Inhibition
  • Nuclear magnetic resonance
  • Phosphinic acids
  • Ultraviolet spectroscopy
  • Yellowing

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Media Technology

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