科研之友
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摘要
Synthetic resins are used for various applications including in paint industry to improve the glossiness, adhesiveness, hardness, and dryness of paints. Resins are essentially polymers, which are builds up from simple molecules or monomers and can be prepared mainly by either addition polymerization or condensation polymerization. Ketones and aldehydes can be converted to resinous products by condensation reaction. The desired property of a synthetic resin greatly depends on its method of preparation and its field of application. In this communication, the literature pertaining to the self condensation of ketones to yield dimer, trimer and tetramer products and also the condensation of various ketone molecules with aldehydes to produce ketone aldehyde resins are analyzed and a state of the art review is written. The present study provides an overview of: i) effect of various operating parameters like reaction time, temperature, pressure, type of catalyst and its loading on a condensation polymerization reaction; ii) various techniques and ideas to analyze the product properties and to remove the catalyst from the reaction mass; iii) effect of phase transfer catalysts (PTCs) on the resin product properties such as softening temperature, moisture content, gardener color number etc. In a nutshell, an attempt has been made to get the aforementioned aspects together in a coherent manner so that the information is available at a glance and is expected to be useful to the researchers and for industrial practices.
- 出版日期2015-3-20
