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One - Step Synthesis of Rosin Modified Dodecylphenolic Resin

Huang Baoquan (College of Chemistry & Materials Science , Fujian Normal University, Fuzhou 350007)  
Rosin modified dodecylphenolic resin was synthesized from rosin, fumaric acid, dodecylphenol and formaldehyde,etc.as raw material in the presence of magnesium oxide by one - step method.The optimum composition of rosin modified dodecylphenolic resin was determined as follows: the contents of rosin, fumaric acid, phenolic aldehyde,pentaerythritol were 50% - 55% ,1.5% - 2% ,35% - 40% ,10% - 15% respectively and molar ratio of dodecylphenolic to formaldehyde was 1:2. The effects of fumaric acid amount, alkylphenol structure and formaldehyde kinds on the properties such as viscosity, solubility and softening point were examined.
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