Author:
Kızılcan Nilgun,Sert Selda
Abstract
Purpose
Cyclohexanone-formaldehyde resin (CFR) was in situ modified with tannin (T) in the presence of sodium hydroxide. The purpose of this study is to produce eco-friendly tannin-modified cyclohexanone resins (TCFR) with a one-step method that has higher decomposition temperature than CFR. The solubility, molecular weight and thermal properties of the product were investigated.
Design/methodology/approach
Cyclohexanone, formalin (37 per cent aqueous solution) and tannin were mixed and 20 per cent aqueous NaOH solution was added to produce the resin. Tannin has environmentally friendly bio-based phenolic compounds that the tannin structure has been incorporated into the structure of the cyclohexanone formaldehyde resin during the in situ modification of resin, such as resole resin.
Findings
The improvement of the properties of the TCFRs produced from condensed tannin. TCFRs were soluble in common organic solvents. The product TCFR has a dark red colour.
Research limitations/implications
The reaction mixture must be stirred continuously. Subsequently, 37 per cent formalin was added drop-wise in total while refluxing. The amount of aqueous NaOH solution of it is limited, as the formed resin may become insoluble in common organic solvents. At the end of the reaction, a water-soluble resin is obtained. Then, the water of water phase was removed from TCFR reaction system, successively by evaporating with rotary evaporator.
Practical implications
This study provides the application of ketonic resins. The TCFR containing tannin groups may also promote the adhesive strength of a coating.
Social implications
These resins may be used for the preparation of adhesive. Condensed tannin, with a large amount of Catechol groups was considered for reducing the formaldehyde emission level on the adhesive system.
Originality/value
TCFR has been synthesised in the presence of a base catalyst. Environmental and ecological concerns have increased the attention paid by chemical industry to renewable raw materials.
Subject
Materials Chemistry,Surfaces, Coatings and Films
Reference21 articles.
1. Aniline and oligoaniline modified cyclohexanone formaldehyde resins;Pigment & Resin Technology,2011
2. The chemical, kinetic and mechanical characterization of tannin-based adhesives with different crosslinking systems;International Journal of Adhesion & Adhesives,2016
3. Influence of interfacial adhesion on the mechanical properties and fracture behavior of short sisal fiber rein forced polymer composites;European Polymer Journal,1996
4. Modification of acetophenone-formaldehyde and cyclohexanone – formaldehyde resins;Journal of Applied Polymer Science,1996
5. In situ modified cyclohexanone formaldehyde resin;Die Angewandte Makromolekulare Chemie,1999
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