Development of fast-curing, phenolic resin adhesives

快速固化酚醛树脂粘合剂的开发

• 批准号: 62860022
• 负责人: HIGUCHI Mitsuo
• 金额: $ 3.2万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-62860022/
• 关键词: Fast-curing phenolic resin; Suspension-type adhesive; 懸濁型接着剤; 水溶性フェノール樹脂; ノボラック; 硬化促進剤

The effects of various factors on the curing-rate of phenolic resin adhesives were investigated quantitatively. The main factors affecting the rate of cure, other than temperature, are the molecular sizes of the resin, resin concentrations, formaldehyde to phenol molar ratios, alkali to phenol molar ratios, and additives. The rate of cure increases in a linear fashion with the increases in the molecular size and in the resin concentration. The rate of condensation reaction increases proportionately with the square of the formaldehyde/phenol molar ratio. The optimum alkali/phenol molar ratio changes with the formaldehyde/ phenol molar ratio. These results show that a fast-curing phenolic resin can be obtained by increasing the resin molecular size, the resin concentration, and the formaldehyde/phenol molar ratio and by choosing the optimum alkali/phenol molar ratio. However, upgrading along this line brings about problems: an enormous increase in viscosity and an extremely short pot-life.To overcome these problems a suspension-type adhesive system was designed. A suspension-type adhesive formulated from an ordinary phenolic resin and a powdered novolac with number-averaged molecular weight of 2,500 worked well in bonding high-moisture content veneers.

定量研究了各种因素对酚醛树脂胶粘剂固化速度的影响。除温度外，影响固化速度的主要因素是树脂的分子尺寸、树脂浓度、甲醛与苯酚的摩尔比、碱与苯酚的摩尔比以及添加剂。固化速度随着分子尺寸和树脂浓度的增加而线性增加。缩合反应速率与甲醛/苯酚摩尔比的平方成正比增加。最佳碱酚摩尔比随甲醛苯酚摩尔比的变化而变化。结果表明，通过增大树脂分子尺寸、树脂浓度和甲醛/苯酚摩尔比，并选择最佳的碱酚摩尔比，可以得到快速固化的酚醛树脂。然而，沿着这条线升级带来了问题：粘度极大地增加和极短的贮存期。为了克服这些问题，设计了悬浮式粘接系统。由普通酚醛树脂和数均相对分子质量为2500的粉状酚醛树脂配制的悬浮型胶粘剂，在高含水率单板的粘接中效果良好。

项目成果

M.Higuchi;S.Tomura;I.Sakata: 木材学会誌. 35. (1989)

M.Higuchi；S.Tomura；I.Sakata：日本木材科学学会杂志 35。（1989）

M.HIGUCHI; S.YOHMURA and I.SAKATA: "Acceleration of the Cure of Phenolic Resin Adhesives I. Adhesives systems formulated from resins if advanced condensation." 木材学会誌. 36. No.3 (1990)

M.HIGUCHI；S.YOHMURA 和 I.SAKATA：“酚醛树脂粘合剂 I 的固化加速。由树脂配制的粘合剂系统，如果先进缩合。”日本木材科学学会杂志 36。第 3 期（1990 年）。

S. TOHMURA, M. HIGUCHI and I. SAKATA: "Acceleration of the Cure of Phenolic Resin Adhesives III. Effects of carbonates and formamide on the rate of cure." Mokuzai Gakkaishi.

S. TOHMURA、M. Higuchi 和 I. SAKATA：“加速酚醛树脂粘合剂的固化 III。碳酸盐和甲酰胺对固化速度的影响。”

M.HIGUCHI,S.TOHMURA and I.SAKATA: "Acceleration of the Cure of Phenolic Resin Adhesive I.Adhesive systems formulated from resins of Advanced condensation." 木材学会誌. 36. No.3 (1990)

M.HIGUCHI、S.TOHMURA 和 I.SAKATA：“加速酚醛树脂粘合剂的固化 I. 由高级缩合树脂配制的粘合剂体系。” 日本木材科学学会杂志 36. No.3 (1990)。

S.TOHMURA; M.HIGUCHI and I.SAKATA: "Acceleration of the Cure of Phenolic Resin Adhesives II. Kinetics of the curing reaction of phenolic resins." 木材学会誌.

S.TOHMURA；M.HIGUCHI 和 I.SAKATA：“酚醛树脂粘合剂的固化加速 II。酚醛树脂固化反应的动力学”。