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Study on Synthesis, Crystal Structures and Mechanics of Green Urea-Formaldehyde Resin and 3, 3’-(Alkanediyldiimino) Dibut-2-enoates Etc.

Author: ZhangZhenFeng
Tutor: LiuBo
School: Shanxi University
Course: Organic Chemistry
Keywords: Green Chemistry Urea-formaldehyde resin Crystal structure Allomorphic phenomenon 3 - methylpyrazole -5 - one Configuration 3,3 ' - alkylene two Diglycolamidic D -2 - acid ester
CLC: TQ433
Type: Master's thesis
Year: 2004
Downloads: 117
Quote: 0
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Abstract


In this paper, for the purpose of Green Synthetic Chemistry, focuses on a urea-formaldehyde resin adhesive, 3,3 '- alkylene two Diglycolamidic D -2 - acid esters of green synthesis, reaction mechanism and crystal structure. Since urea-formaldehyde resin adhesive raw materials readily available, inexpensive, high bonding strength advantages, has been widely used in the sheet metal industry. Currently using urea-formaldehyde resin binder is a common problem of free formaldehyde, unstable quality, all kinds of plywood, wood products and furniture is often experienced long-term formaldehyde release, not only pollute the environment, damage to people's health, but also seriously hampered the healthy development of sheet metal industry. China joined the WTO, in order to meet the domestic market of the PRC State Administration of Quality Supervision, Inspection and Quarantine on December 10, 2001 released the GB18580-2001 standard, the new standard since July 1, 2002 came into effect, prohibit the sale of market non-compliant products. 2002, China again \Comply with requirements of the development at home and abroad, the paper on the synthesis of urea-formaldehyde resin reaction mechanism in-depth study, by introducing a new connection means, the use of \innovation, to make it more feasible. Without adding any modifiers case, the resulting urea-formaldehyde resin, the content of free formaldehyde, adhesive strength, physical properties such as formaldehyde emission standards to meet the new requirements of GB18580-2001. As a possible parent heterocyclic ligands and metal ions, N, N'-two D -2 - acid ester-substituted diamines, one of 3,3 '- (1,2 - ethanediyl-imino) two D -2 - acid esters have been extensively studied. The substance is usually caused by ethyl acetoacetate with ethylenediamine in an anhydrous organic solvent, by the polymerization reaction from the system, the presence of water, the reaction is often considered a disadvantage. Until 2000, Stefai its collaborators reported the aqueous medium β-keto esters, 1,3 - dione and diamine reaction, the so-called product from its offer of ~ 1HNMR spectrum is clearly contradictory; the other hand, other Similar compounds so far not been reported in the literature. This article provides a 3,3 '- alkylene two Diglycolamidic D -2 - acid ester (four kinds not yet reported) green synthesis method. Due to the water as the medium, low cost, high yield, easy separation and purification, environmental friendly. Although we have successfully implemented a number of N, N'-diene ester synthesis of substituted aliphatic diamine, but there have been some unexpected situation: We did not get a chain disubstituted hydrazine, but get is cyclized 3 - methylpyrazole-5 - one, the position of double bond can not be determined by ~ 1HNMR: In addition, the resulting chain is primarily for further synthesis of compounds of the heterocyclic ring of a substrate, as the new compounds we its determine the nature and properties of some of the structural features of the lack of understanding; such compounds configuration, conformation has not yet been studied. By X-ray structure analysis to determine the 3 - methyl-3 - pyrazole-5 - one of the structures found its allomorphic phenomenon: Determine the 3,3 '- (1,2 - ethanediyl amine) two D -2 - acid ethyl ester and 3,3 '-1,2 - malonyl imino) two butan-2 - enoate configuration, conformation, first discovered this kind of linear polyatomic molecules present in the \

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