Make
a preparation of phenolic condensation compound, mix alkylphenol, sodium
hydroxide and water together and melt it with heat, keep the it's temperature
between 50-60°C for chemical reaction for 4 hours, and then cool it down to
40-50°C and add diluted hydrochloric acid to neutralize it.
Grind
the Gum Rosin into powder, heat it up to be melted and then stir it, when the
temperature up to 150-160°C, mix the melted rosin with maleic anhydride, and
then heat it up to 190-200°C for chemical reaction for 1 hour.
Drop the phenolic
condensation compound it to the melted gum rosin and heat them up to 230-240°C,
add pentaerythritol and magnesium oxide into it for further reaction for 1
hour, and then raise it's temperature up to 270-280°C. Make it vacuumized when
the acid number low down to 25mgKOH/g, keep the reaction going under the
decompression until the acid number come to the desired value, the final process
Phenolic
Resin Water Based Emulsion complete.