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    Home > Coatings News > Paints and Coatings Market > Pigments and fillers for powder coatings

    Pigments and fillers for powder coatings

    • Last Update: 2020-06-19
    • Source: Internet
    • Author: User
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    < br / > segments for powder coatings < br / > ZHU Weibing (Ningbo Chengxiang plastic powder Co., Ltd.) < br / > Cheng Dexi (Changzhou Huazhu Pigment Co., Ltd.) < br / > Abstract: This paper introduces in detail the application of organic pigments, inorganic pigments, metal powder pigments, functional pigments in powder coatings and the technical parameters of pigment products< br / > 1Introduction < br / > pigments for powder coatings can be roughly divided into four categories according to their properties and functions: coloring pigments, metal pigments, functional pigments, physical pigments, etcThey are an important part of powder coatingsThey can give the coating colorful color, improve the mechanical and chemical properties of the coating, or reduce the cost of the coating< br / > pigments can be divided into two categories: organic and inorganic, which can cover almost all the color systemsMetal pigments mainly include floating and non floating aluminum powder, copper gold powder and pearlescent pigment of various colors, nickel metal powder and stainless steel powder, etcFunctional pigments mainly include fluorescent pigments, luminous pigments, high temperature resistant pigments, conductive pigments, etcGenerally speaking, physical pigments include titanium dioxide (anatase and rutile), calcium carbonate (light and heavy), barium sulfate (precipitated and natural barite), talcum powder, bentonite, quartz powder, etc< br / > the preparation of high-quality powder coating is inseparable from the selection of high-quality pigments and fillersSee Table 1 for the influence of pigments and fillers on powder properties< br / > Table 1 the relationship between pigments and fillers and powder coating < br / > the content of pigments and fillers is low, and the gloss is high, and the flexibility is flexible, and the impact strength is strong, and the adhesion is smooth, and the weatherability is good, and the coating pattern is good, and the powder storage is good, and the powder cost is good; ————————- &; High < br / > low --- --- --- &; high < br / > High ---; high --- low --- < br / > High ---; low --- some basic principles for the selection of pigments and fillers < br / > 2.1 the selection of pigments < br / > &; there are many kinds of pigments with different properties, and not all pigments can be used in powder coatingsDue to the particularity of powder coating technology, the following points should be paid attention to when choosing pigment< br / > &; the dispersion of pigment is good, and the best dispersion particle size is 0.2-0.9 & micro; m, which is not easy to agglomerate< br / >< br / >< br / >< br / >< br / > 2.2 selection of filler < br / > adding a certain amount of filler to the powder coating can increase the hardness and other mechanical properties of the coating, and reduce the cost, which is an effective way to adjust the cost of powder coating< br / > the fillers used in powder coatings are mainly calcium carbonate and barium sulfate, while the fillers such as bentonite, talcum powder and quartz powder can be seen as successful functional fillers, and the total dosage is very small< br / > according to the factors of production process and raw materials, calcium carbonate can be divided into light calcium carbonate and heavy calcium carbonate, both of which are used in powder< br / > there are also two types of barium sulfate: precipitation type and barite typeThe former is made by chemical reaction, while the latter is made by grinding natural barite< br / > the problems that should be paid attention to when selecting filler are: < br / > &; the whiteness of filler should be high, which can reduce the amount of titanium dioxide< br / >< br / >< br / >< br / > 3 tone color tips < br / > (1) color can be generally divided into red, orange, yellow, green, blue, purple, black, white and other categoriesThere is a certain relationship between the colorsWe can use three parameters to represent any color, that is, hue, saturation and lightness< br / > hue is the basic characteristic to distinguish each color, which depends on the spectral composition of the light source and the feeling of the reflected light wave on the surface of the object to the human eye, reflecting the "quality" characteristics of the color< br / > saturation refers to the purity of color on the basis of "quality", also known as "chromaticity"< br / > lightness is the perception of the human eye on the brightness of the object color, and each person has different judgment< br / > The other colors are all made of these three colors < br / > The content of this aspect will be detailed in another article < br / > 4 brief introduction of all kinds of pigments < br / > 4.1 coloring pigments < br / > 4.1.1 inorganic pigments < br / > ① carbon black < br / > carbon black is the most important black pigment Due to different production processes, the color phase, coloring power and dispersion of carbon black are greatly different There are mainly acetylene black, tank carbon black, lamp black, etc Carbon black has good UV resistance < br / > for carbon black suitable for powder coating, it is recommended that regal303r of Cabot and MA-100 of Mitsubishi of Japan are both blue phase carbon black with pure color phase Refer to table 2 for typical data < br / > Table 2 some typical properties of Cabot regal330r < br / > particle size < br / > by electron microscopy, NM < br / > specific surface area (bet-n2 method) m2 / g < br / > DBP absorption m3 / 100g < br / > coloring power% volatile matter% < br / > density g / L < br / > 2594651101.0304 < br / > domestic carbon black generally presents red phase, with low coloring power and poor dispersion < br / > ② iron oxide pigments < br / > are mainly divided into three categories: iron yellow, iron red and iron black (including iron brown) Iron oxide pigments are widely used in powder coatings, which are cheap, nontoxic and easy to disperse Here are the basic performance parameters of a series of iron oxide pigments from Bayer, Germany and a domestic factory (see Table 3 and table 4) < br / > Table 3 performance parameters of Bayer's series of iron oxide pigments < br / > Product Code: Fe2O3 content% SiO2 &; Al2O3 < br / >% loss on ignition at 1000 ℃ oil absorption < br / > G / 100gph value density < br / > G / cm3 particle size < br / > & micro; m0.045mm screen residue, %5T < br / > iron brown 86-8861.5285.5- < br / > < br / > Table 4 basic performance data of domestic iron oxide pigment < br / > production There are three kinds: molybdenum chrome red and chrome green This kind of pigment has bright color, good acid and alkali resistance, strong coloring power and easy dispersion, which is widely used in the domestic powder industry The heat resistance and weather resistance of chrome pigment are worse than that of iron oxide pigment Chrome yellow can be subdivided into lemon yellow, light chrome yellow, medium chrome yellow, dark chrome yellow, orange chrome yellow, etc according to the color phase It is widely used in lemon yellow and medium chrome yellow See Table 5 for the basic properties of chrome yellow (see Table 6) < br / > Table 6 performance parameters of molybdenum chromium red series < br / > lead chromate% oil absorption < br / > G / 100g sieve residue < br / >% pH value water soluble < br / >% water content < br / >% < br / > 107 molybdenum chromium Red > 50 < 22 < 0.54-7 < 1 < br / > 307 molybdenum chromium Red > 70 < 0.54-8 < 2 < br / > ordinary chromium pigments are not light resistant and have general temperature resistance At present, many suppliers have improved the process of coating chrome yellow and chrome red with silicon, which can significantly improve the temperature resistance to over 220 ℃, and the light resistance is also greatly improved compared with ordinary chrome pigments Please refer to DCC's 9000 series products for coated chrome pigments < br / > chrome green phase is pure and nontoxic, and it is mostly used to prepare green powder with special effect See Table 7 for performance < br / > Table 7 basic performance parameters of domestic chrome green pigment < br / > Cr2O3 content% 600 mesh screen residue% pH value oil absorption g / 100g water soluble matter < br / >% water content < br / >% < br / > sgc-m > 98.5 < 0.14-7 < 20 < 0.2 < 0.2 < br / > SGC > 99 < 0.34-7 < 20 < 0.3 < 0.2 < br / > SGP > 99.5 < 0.34-7 < 20 < 0.2 < br / > chrome pigment quality produced by various manufacturers is quite different, so it is necessary to pay attention to the selection The products of Shanghai chrome yellow pigment factory and foreign manufacturers such as DCC company of Canada, BASF of Germany and Switzerland are recommended to be used as chrome pigments for powder coatings, but the price of products of foreign companies is relatively high < br / > ④ ultramarine, chemical name of Ultramarine and other aluminum sulfonated sodium silicate, rich in color, from pink to purple, good heat resistance, no migration, non-toxic, easy to disperse Acid and alkaline resistance is poor, outdoor powder is generally not used < br / > there are few varieties of domestic ultramarine, with low brightness and low coloring power It is recommended to use the series products of Holliday company, such as rs-05, rs-08 and rs-32 < br / > by the way, this company's Manganese violet, chemical name manganese ammonium pyrophosphate, has unique color, soft and elegant color, temperature resistance up to 250 ℃, no migration, light resistance up to 7-8 levels, mostly used in white powder < br / > ⑤ other inorganic pigments < br / > iron blue, molecular formula: FE4 [Fe (CN) 6] 3 &; xH2O It has good comprehensive performance and is not widely used < br / > titanium green and titanium blue are titanates, containing nickel (Ni), zinc (Zn) and aluminum (AL) Titanium green alkali resistant, poor heat resistance, generally used for indoor occasions The performance of titanium blue is acceptable They are not widely used < br / > 4.1.2 organic pigments < br / > ① phthalocyanine blue < br / > phthalocyanine pigments Phthalocyanine blue BGS is mostly used in domestic powder factories, which is a national standard product The color light is green phase blue, β crystal, with good dispersibility and coloring power The imported phthalocyanine blue is recommended to use BASF's l7072d and l7090, or Germany's Klein's B2G < br / > according to the comprehensive properties and years of application practice, there is no domestic phthalocyanine blue that can meet the requirements of powder coating and its varieties Most powder factories use imported phthalocyanine blue to make up < br / > Table 8 technical parameter index of phthalocyanine blue BGS < br / > oil absorption g / 100g40-50ph value 1.6 < br / > heat resistance ℃ 200 alkali resistance level 5 < br / > sun resistance level 7-8 water resistance level 5 < br / > sieve residue% < 5 oil resistance level 5 < br / > water soluble matter% < 1 specific gravity g / cm1.7 < br / > water content% < 1.5 light resistance level 7 < br / > ② phthalocyanine green < br / > belongs to copper phthalocyanine pigments Phthalocyanine green G is widely used in domestic powder plants, and its basic properties are shown in Table 9 < br / > Table 9 technical specifications of phthalocyanine green G < br / > pH value 6.5-7 light resistance, Grade 7 < br / > specific gravity, g / cm31.7 heat resistance, ℃ 200 < br / > oil absorption, g / 100g40 water resistance, grade 5 < br / > acid and alkali resistance, grade 5 oil resistance, grade 5 < br / > to obtain pure phthalocyanine green, most domestic phthalocyanine green is yellow phase, The main suppliers are Shanghai No.1 dyeing and chemical plant and Shanghai No.11 dyeing and chemical plant, Jiangsu Shuangle chemical, Anhui Heya chemical, etc < br / > imported phthalocyanine green, mainly used for automobile varieties, push more
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