Modified phenol formaldehyde resin and preparation method thereof

Modified phenol formaldehyde resin and preparation method thereof

  • CN 102,690,403 B
  • Filed: 06/15/2012
  • Issued: 11/13/2013
  • Est. Priority Date: 06/15/2012
  • Status: Active Grant
First Claim
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1. modified phenolic resins is characterized in that:

  • by mass percentage, synthetic by following raw material;

    Phenol 14-20%Formalin 33-43%Urea 7-12%Trimeric cyanamide 4-8%Alkaline aqueous solution 3-8%Water 20-30%;

    Its preparation method, comprise the steps;

    A, at adding proportion scope internal component, add formalin, the part amount adds water, and with alkaline aqueous solution, adjusts between pH value to 7.5~

    10.5;

    B, at adding proportion scope internal component, add urea, and evenly be warming up to 55~

    70 ℃

    , insulation reaction 10~

    30 minutes;

    C, add phenol, at adding proportion scope internal component, add alkaline aqueous solution, make temperature rise to 70~

    90 ℃

    ;

    D, insulation reaction also detect viscosity, add trimeric cyanamide when viscosity reaches 35-45 mPs, add remaining water, formalin and alkaline aqueous solution;

    E, be warming up to 65~

    85 ℃

    of reactions, and insulation;

    When the test gelatin viscosity is 55~

    135 mPs, cooling, and add remaining urea, and continuing to be cooled to below 35 ℃

    , blowing, obtain modified phenolic resins;

    Or its preparation method, comprise the steps;

    A, at adding proportion scope internal component, add formalin, the part amount adds water, and with alkaline aqueous solution, adjusts between pH value to 7.5~

    10.5;

    B, at adding proportion scope internal component, add urea, and evenly be warming up to 55~

    70 ℃

    , insulation reaction 10~

    30 minutes;

    C, add trimeric cyanamide, at adding proportion scope internal component, add alkaline aqueous solution, make temperature rise to 70~

    90 ℃

    ;

    D, insulation reaction also detect water-solublely, add phenol when becoming turbid, add remaining water, formalin and alkaline aqueous solution;

    E, be warming up to 65~

    85 ℃

    of reactions, and insulation;

    When the test gelatin viscosity is 55~

    135 mPs, cooling, and add remaining urea, and continuing to be cooled to below 35 ℃

    , blowing, obtain modified phenolic resins;

    Wherein, described formalin adds in two steps, and the amount that at every turn adds is the 30%-70% of formalin total amount;

    Described alkaline aqueous solution adds in two steps, and the amount that at every turn adds is the 20%-80% of alkaline aqueous solution total amount;

    Described water adds in two steps, and the amount that at every turn adds is the 40%-60% of water inventory;

    Described urea adds in two steps, and the amount that at every turn adds is the 35%-65% of urea total amount.

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