- 【Updated on May 12, 2025】 Integration of CiNii Dissertations and CiNii Books into CiNii Research
- Trial version of CiNii Research Knowledge Graph Search feature is available on CiNii Labs
- 【Updated on June 30, 2025】Suspension and deletion of data provided by Nikkei BP
- Regarding the recording of “Research Data” and “Evidence Data”
-
- ITO Sotaro
- Department of Applied Chemistry, Faculty of Engineering, Hiroshima University
-
- YAMAGUCHI Toshiko
- Department of Civil Engineering, Faculty of Engineering, Hiroshima University
Bibliographic Information
- Other Title
-
- 尿素系土質安定剤のゲル化反応
- ニョウソケイ ドシツ アンテイザイ ノ ゲルカ ハンノウ
- Special Articles on Global and Regional Environment and Chemistry. Gelation Reaction of Soil Stabilizer of Urea-Formaldehyde Condensate Type.
Search this article
Description
The purpose of this study is to reveal the chemical characteristics of gelation reaction of the soil stabilizer. Analysis of composition of the soil stabilizer (Table 1) and the gel (Table 2 and Fig.3) showed that 80% of formaldehyde in the soil stabilizer exists as the form of N, N'bis(hydroxymethyl)urea (BHU) and the gelation process is essentially an acid-catalyz e d condensation reaction of BHU with urea. The“gel”was found to be the condensation products of 2 molecules of BHU with 1-3 molecules of urea, i. e., N, N'-bis(hydroxymethyl)-5oxo-2, 4, 6, 8-tetraazanonanediamide 7, N-hydroxymethyl-5, 9-dioxo-2, 4, 6, 8, 10, 12-hexaazatridecanediamide 5 and 5, 9, 13-trioxo-2, 4, 6, 8, 10, 12, 14, 16-octaazaheptadecanediamide 6, depending on the amount of urea added. Effects of gelation conditions such as gelation time (Table 4), amount of urea added (Fig.6), concentration of sulfuric acid (Fig.7), amount of water added (Fig.8) and gelation temperature (Fig.9) on the gelation reaction were also examined. These results are consistent with the proposed reaction scheme which includes the formation of Nhydroxymethyl2, 4-diazapentanediamide 8 as a common intermediate (Reaction Scheme of Gelation).
Journal
-
- NIPPON KAGAKU KAISHI
-
NIPPON KAGAKU KAISHI 1991 (6), 898-907, 1991-06-10
The Chemical Society of Japan
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1390282679334466688
-
- NII Article ID
- 130004159673
- 40002846238
-
- NII Book ID
- AN00186595
-
- ISSN
- 21850925
- 03694577
-
- NDL BIB ID
- 3711935
-
- Data Source
-
- JaLC
- NDL Search
- Crossref
- CiNii Articles
-
- Abstract License Flag
- Disallowed