COCONDENSATION OF MELAMINE AND UREA THROUGH FORMALDEHYDE
三聚氰胺和尿素通过甲醛共缩合
基本信息
- 批准号:07456077
- 负责人:
- 金额:$ 4.74万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1996
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The C-13 NMR spectra of urea-formaldehyde (UF) resins, melamine-formaldehyde (MF) resins and melamine-urea (MUF) cocondensed resins synthesized with various conditions were measured with a frequency of 75 MHz. It was investigated whether the occurrences of cocondensation between melamine and urea through the formation of methylene or dimethylene ether linkages can be identified or not. Several reactions using labeling method with C-13 enriched formaldehyde under neutral conditions were also analyzed to determine the driving force to introduce the cocondensation through the formation methylene or dimethylene ether linkage into melamine-urea resin system.The signals due to carbons of methylene linkages of UF resins were clearly identified from those of MF resins. the signals due to carbons of cocondensed methylene linkage could be recognized separately from those due to UF and MF resins. The formation of cocondesed methylene linkages was mainly induced by the reaction of methylol groups of melamine and primary amino groups of urea residue, and that of cocondensed dimethylene ether linkages was apt to take place in the case of shortage primary amino groups urea residue. It was concluded that the effective introduction of cocondesed methylene linkages can be done either by reacting methylolmelamine with urea or methylolureas abundant in the primary amino groups, or by reacting methylol groups of urea with amino groups of melamine.
在75 MHz频率下,测定了不同合成条件下脲醛树脂、三聚氰胺甲醛树脂和三聚氰胺尿素共缩聚树脂的~(13)C NMR谱。研究了三聚氰胺与尿素通过形成亚甲基或二亚甲基醚键发生共缩合反应的可能性。在中性条件下,用标记法分析了富碳13甲醛的几个反应,确定了通过形成亚甲基或二亚甲基醚键将共缩合引入三聚氰胺-脲醛树脂体系的驱动力,并将UF树脂的亚甲基键碳信号与MF树脂的亚甲基键碳信号进行了清晰的区分。由共缩合亚甲基键的碳引起的信号可以与由UF和MF树脂引起的信号分开识别。三聚氰胺的羟甲基与尿素残基上的伯氨基反应主要形成共缩合的亚甲基键,而尿素残基上伯氨基不足时,易形成共缩合的二亚甲基醚键。可以得出结论,通过使羟甲基三聚氰胺与在伯氨基中丰富的脲或羟甲基脲反应,或者通过使脲的羟甲基与三聚氰胺的氨基反应,可以有效地引入共缩合的亚甲基键。
项目成果
期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Bunichiro TOMITA: "Analysis of Cocondensation of Melamine and Urea through Carbon 13 Enriched Formaldehyde with Carbon 13 Nuclear Magnetic Resonance" Mokuzai Gakkaishi. 41. 490-497 (1995)
Bunichiro TOMITA:“通过碳 13 富集甲醛与碳 13 核磁共振分析三聚氰胺和尿素的共缩合”Mokuzai Gakkaishi。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Bunichiro Tomita: "Analysis of Cocondensation of Melamine and Urea through Formaldehyde with Carbon 13 Nuclear Magnetic Resonance" Mokuzai Gakkaishi. 41,3. 349-354 (1995)
富田文一郎:“用碳 13 核磁共振分析三聚氰胺和尿素通过甲醛的共缩合”Mokuzai Gakkaishi。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Bunichiro TOMITA: "Analysis of Cocondensation of Melamine and Urea through Formaldehyde with Carbon 13 Nuclear Magnetic Resonance" Mokuzai Gakkaishi. 41. 349-354 (1995)
富田文一郎:“用碳 13 核磁共振分析三聚氰胺和尿素通过甲醛的共缩合”Mokuzai Gakkaishi。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Bunichiro Tomita: "Analysis on Cocondensation of Melamine and Urea through C-13 Enriched Formaldehyde with C-13NMR Spectroscopy" Mokuzai Gakkaishi. 41. 490-497 (1995)
Bunichiro Tomita:“利用 C-13 NMR 光谱分析三聚氰胺和尿素通过 C-13 富集甲醛的共缩合”Mokuzai Gakkaishi。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
Bunichiro Tomita: "Analysis of Cocondensation of Melamine and Urea through C-13 Enriched Formaldehyde with Carbon-13 Nuclear Magnetic Resonance" Mokuzai Gakkaishi. 41、5. 490-497 (1995)
Bunichiro Tomita:“通过碳 13 核磁共振分析三聚氰胺和尿素的共缩合”Mokuzai Gakkaishi 41, 5. 490-497 (1995)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
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TOMITA Bunichiro其他文献
TOMITA Bunichiro的其他文献
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{{ truncateString('TOMITA Bunichiro', 18)}}的其他基金
Application of Liquefaction to Wood-Based Materials Hard to be Abandoned
液化在难废弃木质材料中的应用
- 批准号:
13460072 - 财政年份:2001
- 资助金额:
$ 4.74万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
New Reduction Method of Formaldehyde Emission from Wood-Based Materials
减少木质材料甲醛释放量的新方法
- 批准号:
10460070 - 财政年份:1998
- 资助金额:
$ 4.74万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Efficient Utilization of Ozonized Lignin
臭氧化木质素的高效利用
- 批准号:
08556025 - 财政年份:1996
- 资助金额:
$ 4.74万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Synthesis of Phenol-Urea-Formaldehyde Cocondensed Resins and Their Application
苯酚-脲-甲醛共缩合树脂的合成及其应用
- 批准号:
04453140 - 财政年份:1992
- 资助金额:
$ 4.74万 - 项目类别:
Grant-in-Aid for General Scientific Research (B)
Research on the Synthesis of Phenol-Urea Alternative Copolymer
苯酚-脲替代共聚物的合成研究
- 批准号:
01560176 - 财政年份:1989
- 资助金额:
$ 4.74万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
New Curing System of Urea-Formaldehyde Resins Under Neutral Condition
新型脲醛树脂中性条件固化体系
- 批准号:
61560184 - 财政年份:1986
- 资助金额:
$ 4.74万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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