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    Home > Coatings News > Paints and Coatings Market > General knowledge of coating: application of common mineral powder materials in emulsion paint and putty

    General knowledge of coating: application of common mineral powder materials in emulsion paint and putty

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: powder was first used in latex paint and putty in order to increase the volume of paint and putty, only filling to reduce product costs, mainly defined as filler

    With the development of mineral deep processing technology, the powder is further refined and modified, with many other functions added

    In the formulation design process of mineral powder materials for latex paint and putty, many properties of latex paint and putty can be improved through variety selection and reasonable collocation, which are as follows: (1) effectively reduce the luster of latex paint film; (2) improve the hardness, wear resistance and tensile strength of latex paint; (3) improve the whiteness of latex paint and improve the latex paint Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different

    There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating

    In private rooms, most of us choose according to our own personality, personal hobbies and living habits

    The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: powder was first used in latex paint and putty to increase the volume of paint and putty, only filling to reduce product costs, mainly defined as filler

    With the development of mineral deep processing technology, the powder is further refined and modified, with many other functions added

    In the formulation design process of mineral powder materials for latex paint and putty, many properties of latex paint and putty can be improved through variety selection and reasonable collocation, which are shown as follows: (1) effectively reducing the luster of latex paint film; (2) improving the hardness, wear resistance and tensile strength of latex paint; (3) improving the whiteness, viscosity and settling performance of latex paint; and (4) In the high PVC (pigment volume concentration) emulsion paint, improve the dry film coverage of the emulsion paint; improve the solid content and film fullness of the emulsion paint, improve the construction performance of the emulsion paint; reduce the VOC content; release the negative ion function; improve the scrub resistance, stain resistance and aging resistance of the emulsion paint

    1

    Heavy calcium carbonate the main component of heavy calcium carbonate is CaCO3, which is the most widely used non-metallic mineral powder material

    It is widely used in various interior and exterior wall products of latex paint and matching putty

    The early use of heavy calcium carbonate powder, commonly known as big white powder or double fly powder, generally controls its screening size between 0.045 μ m and 0.075 μ M

    With the development of superfine grinding, shape control and surface modification of heavy calcium carbonate, the heavy calcium carbonate with low price, high whiteness and stable chemical properties has been widely used in latex paint and matching putty, which has largely replaced the light calcium carbonate with relatively high cost and poor aging resistance

    The superfine heavy calcium carbonate powder material has significant effects on shortening the dispersive sanding time, improving the covering power, improving the viscosity of emulsion, reducing the amount of titanium dioxide and improving the polishing performance of putty

    With the discovery of a large number of high quality and high whiteness heavy calcium carbonate resources and the progress of processing technology in China, heavy calcium carbonate powder has largely replaced light calcium carbonate

    At present, the application effect of heavy calcium carbonate powder in interior wall emulsion paint is better

    It is the special calcium carbonate powder material for emulsion paint with particle size control D97 < 10 μ m, D50 about 1.5 μ m, whiteness > 95%, CaCO3 ≥ 98%

    It has better comprehensive advantages than other commonly used powders in cost performance

    2

    Kaolin kaolin is a kind of clay mineral with kaolinite as the main mineral component

    The chemical formula of kaolin is al2o3.2sio.2sio2

    Kaolin can be divided into washed kaolin and calcined kaolin

    The cost of washing kaolin is low, and proper use of kaolin in interior wall emulsion paint can improve the coating The effect of hand feeling: the calcined kaolin has high whiteness and small particle size

    The use of ultra-fine calcined kaolin in the exterior wall coating can replace the appropriate amount of titanium dioxide without reducing the aging resistance of the coating

    In addition, because it can eliminate the light flocculation effect of high titanium dioxide content on the coating film and increase the effective scattering of incident light, the coverage is improved

    In recent years, it has been widely used in the exterior wall coating

    The kaolin used for latex paint is usually superfine kaolin with D97 of 15 μ m, D50 of 2 μ m and whiteness of 92%

    3

    Talc powder talc is a kind of layered hydrous silicate with the theoretical chemical formula of 3mgo.4sio.h2o

    It feels greasy when touched

    There are few natural pure talc ores

    The ore body is often accompanied by chlorite, serpentine, magnesite, tremolite, dolomite, etc

    The application of talcum powder in emulsion paint can improve the workability and leveling of the paint, and has high hardness, and can effectively improve the corrosion resistance of the coating [5]; the application of talcum powder in matching putty can improve the scraping performance of putty

    However, when the amount of emulsion paint is large, it is easy to cause caking sedimentation, and it is also easy to cause pulverization after painting construction

    Moreover, the amount of talc with high whiteness is limited, which has been gradually reduced in recent years

    4

    Barite powder the main component of barite powder is BaSO4

    The precipitated barium sulfate with similar properties and uses is synthesized

    Barite powder can be used in all kinds of medium and high-grade interior and exterior wall latex paint and matching high-grade putty

    Because its density is close to titanium dioxide, it can replace a small amount of titanium dioxide, which will not significantly reduce the covering power of the coating, nor change the PVC of the coating due to the use of it

    Therefore, the proper use of barite powder in the emulsion paint will not significantly change the physical and mechanical properties of the coating

    According to the whiteness index, the raw ore resources of natural high white barite are less than that of heavy calcium carbonate, and the processing cost of block ore processed into powder of the same size is higher than that of heavy calcium carbonate

    Therefore, its application in latex paint is also limited

    5

    The main component of wollastonite is CaSiO3, which has a fibrous crystal structure

    The processed wollastonite powder can keep the characteristics of length diameter ratio > 10

    Wollastonite powder has high whiteness, and also because of its fibrous structure, after dispersion, it can not only improve the white sense of the coating, but also increase the strength of the coating

    Wollastonite powder is widely used as crack resistant fiber in the multi-layer coating

    6

    The main chemical composition of dolomite is MgCO3, and it also contains a certain amount of CaCO3

    The main function of dolomite powder in emulsion paint is similar to that of heavy calcium carbonate powder, but its weather resistance is slightly worse than that of heavy calcium carbonate powder

    7

    The main component of mica powder is aluminosilicate, which has a continuous layered structure, including muscovite, biotite, lepidolite, etc

    The theoretical chemical formula of Muscovite is kal2 [alsi3o10] (OH) 2

    In latex paint, muscovite powder is mainly processed with Muscovite leftover

    Mica sheet can be arranged in parallel orientation in the coating film, so it can increase the sealing performance of the coating film, and can improve the aging resistance and corrosion resistance of the coating film when applied properly in a variety of exterior wall coatings

    Sericite is a subspecies of Muscovite or albite, which is a dense microcrystalline aggregate

    It is a hydrothermal alteration mineral in middle and low temperature

    After sericite processing, the powder retains the silk luster of the mineral, the powder is lubricated, fine and white, and the paint prepared with it has good weather resistance, but the heavy calcium powder with high whiteness is relatively low, so the amount of it is limited in a large number of white emulsion paint

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