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    Home > Coatings News > Paints and Coatings Market > General knowledge of coating: polyacrylate resin (4)

    General knowledge of coating: polyacrylate resin (4)

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Key tips: 2

    Technical measures for preparing high solid acrylate resin 1

    Molecular weight distribution and hydroxyl functional group distribution Each polymer molecule must have more than two hydroxyl groups

    (1) Strictly control the reaction process to make the molecular weight distribution as narrow as possible ① The temperature of polymerization should be stable in the whole process; ② The addition rate of mixed monomer and initiator should be uniform all the time

    (2) Dosage of active functional monomers The amount of hydroxyl functional monomer is much higher than that of conventional acrylate resin

    6.5% to 20% (3) Selection of chain transfer agent Hydroxymercaptan chain transfer agent ho~ Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form

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    Technical measures for preparing high solid acrylate resin 1

    The molecular weight distribution and hydroxyl functional group distribution must make each polymer molecule have more than two hydroxyl groups

    (1) Strictly control the reaction process to make the molecular weight distribution as narrow as possible ① the polymerization temperature should be stable in the whole reaction process; necttype = "rect" style = "margin top: 0px; margin right: 0px; margin bottom: 0px; margin left: 0px; padding top: 0px; padding right: 0px; padding bottom: 0px; padding left: 0px; word wrap: break word; line height: 25px; "> ② the mixing rate of monomers and initiators should always be uniform

    (2) The amount of active functional monomer is much higher than that of conventional acrylate resin

    6.5% → 20% (3) the use of hydroxymercaptan chain transfer agent ho ~ ~ ~ sh 2

    The phenomenon of "flow in furnace" during construction and storage of pigment precipitation is mainly due to the phenomenon of "hot dilution" during baking and heating

    In the process of heating up, the viscosity of hot dilution is much lower than that of solvent evaporation

    Before the cross-linking reaction, the viscosity has been greatly reduced, resulting in sagging

    The reason of pigment precipitation in the storage process is relatively simple, mainly due to the low viscosity of the paint

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