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New Curing System of Urea-Formaldehyde Resins Under Neutral Condition

Research Project

Project/Area Number 61560184
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 林産学
Research InstitutionUniversity of Tokyo

Principal Investigator

TOMITA Bunichiro  Associate Professor of University of Tokyo, 農学部, 助教授 (40012075)

Co-Investigator(Kenkyū-buntansha) MIZUMACHI Hiroshi  Professor of University of Tokyo, 農学部, 教授 (40022165)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1987: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1986: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsUrea-Formaldehyde Resin / Polyhydrazide / Neutral curing / Formaldehyde emission / ユリア・メラミン共縮合樹脂
Research Abstract

The conventional curing system of UF resins is accomplished in the strong acidic state. The difficulties of the resins are considered to be caused from the residual strong acid, which will accelerate the hydrolysis of the final products. From this point of view, the development of the new curing system using neutral condition was investigated in the present report. The new curing system is based on the simple method to mix UF resins with polyfunctional hydrazide compounds under around neutral conditions. Results were concluded as follows:
1. The adhesive strengths of the plywood made using four kinds of dihydrazide compounds as hardner of commercial UF resins were not al all inferior to the conventional curing by ammonium chloride both in the normal test and the soaking at 60 ゜C and passed the JAS value.
2. The curing system using dihydrazide polymers as hardner not only showed comparable adhesive shear strengths with the conventional curing of UF resins, but also reduced the formaldehyde emission from the final product of plywood.
3. It was concluded that the reaction of hydrazide compounds with UF resins involves two stages. The first stage is the reaction of hydrazide group with free formaldehyde. The second stage at the rather higher temperature is due to the cocondensation of hydrazide groups with methylol group of UF resins to give the crosslinking networks between UF resins and hydrazide compound.
From the practical point of view, the new curing system has the great advantage of reducing the formaldehyde emission from the final products using urea-formaldehyde resins and to cure UF resins under the neutral condition.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 三宅克正: 第36回日本木材学会大会研究発表要旨集. 142 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 三宅克正: 第37回日本木材学会大会研究発表要旨集. 293 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 富田文一郎: 木材学会誌.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Katsumasa MIAKE: "Development of New Curing System of Urea-Formaldehyde Resins by Polyhydrazide" Abstract Paper of the 36th Annual Meeting of the Japan Wood Research Association. 142 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Katsumasa Miake: "Development of New Curing System of Urea-Formaldehyde Resins by Polyhydrazide" Abstract Paper of the 37th Annual Meeting of the Japan Wood Research Association. 293 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Katsumasa Miake, Bunichiro Tomita: "Development of New Curing System of Urea-Formaldehyde Resins Under Neutral Condition" Mokuzai Gakkaishi.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 三宅克正: 第36回日本木材学会大会研究発表要旨集. 142 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 三宅克正: 第37回日本木材学会大会研究発表要旨集. (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 富田文一郎: 日本木材学会誌.

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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