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    Home > Coatings News > Paints and Coatings Market > Coating knowledge: precautions for coating water slurry printing

    Coating knowledge: precautions for coating water slurry printing

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Key tips: 1

    The key to the preparation of paint water slurry is the quality of binder

    When preparing dark color slurry, high-quality binder with high solid content should be selected, and then hand feeling modifier that can increase the fastness can be used to ensure the color fastness (rubbing fastness, soaping fastness, scrubbing fastness, etc.)

    The polymer particle diameter of high quality adhesive should be controlled at 0.2um-1um, and the particle size should be uniform

    In summer, due to dry weather and low humidity, the water slurry is easy to be blocked

    In order to reduce the drying speed of the water slurry and prevent the early drying of the printing slurry, a proper amount of hygroscopic agent can be added to the printing slurry to keep the surface of the water slurry wet without skinning

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    The key to the preparation of paint water slurry is the quality of adhesive

    When preparing dark color slurry, high-quality adhesive with high solid content should be selected, and then hand feeling conditioner that can increase the fastness can be used to ensure the color fastness (rubbing fastness, soaping fastness, scrubbing fastness, etc.)

    The polymer particle diameter of high quality adhesive should be controlled at 0.2um-1um, and the particle size should be uniform

    Due to the dry weather and low humidity in summer, the water slurry is easy to be blocked

    In order to reduce the drying speed of the water slurry and prevent the printing slurry from drying too early, a proper amount of hygroscopic agent can be added to the printing slurry to keep the surface of the water slurry wet without peeling

    The general amount is 3%

    The excessive amount of hygroscopic agent will affect the sound fastness

    In the process of printing operation, this kind of situation is often encountered

    At the beginning of printing, the printing pulp has good fluidity, but the printing pulp thickens after normal operation time, especially in the size with fixing agent

    This situation occurs because the printing pattern area is small and the size stays in the net for a long time

    With the evaporation of water and the increase of viscosity, the problem can be solved by adding 5% ammonia water into the printing pulp

    2

    When printing water slurry on chemical fiber fabric for chemical fiber fabric printing, due to the weak coloration of the adhesive on the chemical fiber fabric, if you want to obtain a satisfactory fastness, you need to increase the coloration of the adhesive on the chemical fiber fabric

    The actual method is to add a color fixing agent, but because of the cross-linking effect of the color fixing agent and the adhesive, the product feel will become hard, so it is very important to select the color fixing agent

    If the reaction of fixing agent is too slow, it will not have great effect

    If the reaction is too fast, it will damage the fluidity of the size, make the printing pulp cross-linking too early, and produce blocking phenomenon

    The fixing agent with good fixing color and high quality stability of the size should be selected

    3

    The problems of depth reduction and solidification often occur in the brightness of color in the water slurry printing

    The decrease of brightness depth is due to the opposite effect of water slurry on the pigment

    If you want to improve it, add 10% - 15% white fire oil and appropriate emulsifier in the preparation of water slurry, so as to ensure the bright color

    In the prepared standby water slurry, when adding the pigment, there is a normal reaction, that is, a small amount of viscosity is reduced

    However, some color pigments, especially black, appear the opposite situation, forming slurry solidification, viscosity rise to normal use

    The coagulability of the size can be improved by adding appropriate amount of ammonium sulfate into the solidified size

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