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    Home > Chemicals Industry > Chemical Technology > Preparation method of modified urea-formaldehyde resin quaternary ammonium salt

    Preparation method of modified urea-formaldehyde resin quaternary ammonium salt

    • Last Update: 2021-10-21
    • Source: Internet
    • Author: User
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    [Preparation method] The preparation of modified urea-formaldehyde resin quaternary ammonium salt can be divided into three steps: ①synthesis of urea-formaldehyde resin; ②modification of urea-formaldehyde resin; ③preparation of modified urea-formaldehyde resin quaternary ammonium salt through quaternization reaction


    (1) Synthesis of urea-formaldehyde resin

    Add urea and formaldehyde into a three-necked flask, adjust the pH value to 7.


    (2) Modification of urea-formaldehyde resin

    Use a separatory funnel to slowly add epichlorohydrin to the resin.


    (3) Quaternization (cationization)

    A certain amount of triethylamine is added to the modified resin and reacted at 80-110°C for 4 to 5 hours to obtain a cationic modified urea-formaldehyde resin quaternary ammonium salt flocculant


     

     

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