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Application of aluminum silver paste in coating industry

  • Categories:Industry news
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  • Time of issue:2020-01-07 15:13
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(Summary description)In order to achieve excellent gloss, flicker, brightness, hiding power, tinting strength, chromatic effect, distinct image, floating and other properties, effect coatings containing aluminum pigments must be well dispersed, but they should be dispersed. Take note of the following tips and advice.

Application of aluminum silver paste in coating industry

(Summary description)In order to achieve excellent gloss, flicker, brightness, hiding power, tinting strength, chromatic effect, distinct image, floating and other properties, effect coatings containing aluminum pigments must be well dispersed, but they should be dispersed. Take note of the following tips and advice.

  • Categories:Industry news
  • Author:
  • Origin:
  • Time of issue:2020-01-07 15:13
  • Views:
Information
1. Aluminum silver paste dispersion
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In order to achieve excellent gloss, flicker, brightness, hiding power, tinting strength, chromatic effect, distinct image, floating and other properties, effect coatings containing aluminum pigments must be well dispersed, but they should be dispersed. Take note of the following tips and advice.
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Tip: Aluminum flakes are easy to bend and break. If they undergo high-speed stirring or other continuous and severe processing during the coating production process, their geometric structure is easily destroyed, resulting in coarse grains, dark color, reduced hiding power, and metal migration and other undesirable phenomena. , so high-shear dispersion means should not be used.
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Suggestion: It is recommended to use the pre-dispersion method: first select an appropriate solvent or a mixture of several solvents. Add the solvent to the aluminum slurry with the ratio of aluminum powder slurry to solvent 1:1 or 1:2, stir slowly until uniform (about 10-20min), and add wetting agent or dispersing agent to the system.
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2. Resin system
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Many common coating binders such as oil-based varnish binders, acrylates, alkyds, epoxy, polyurethane and water-based binders, both floating and non-floating aluminum silver paste pigments can be applied. In general, any coating base or solvent is suitable as long as it is compatible with the solvent of the aluminum silver paste and does not cause chemical damage to the aluminum silver paste. It is worth noting that aluminum is an amphoteric metal, and the acid value of the paint should be controlled below 7.
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The choice of solvent
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The choice of flux is mainly determined by the paint determined by the formula. Non-floating aluminum silver paste can be widely used polar flux, such as aliphatic or aromatic hydrocarbons, esters (such as butyl acetate), ketones (such as methyl ethyl ketone, methyl isobutyl ketone), alcohols (such as ethanol). The floating aluminum silver paste can only use non-polar solvents, and preferably aliphatic or aromatic solvents with high surface tension, especially petroleum spirit, diphenyl, toluene and high flash point naphtha, because they Can promote excellent flotation. Moisture will react with aluminum to generate hydrogen, which will cause hearing-boosting effect. Therefore, the water content in the coating should be strictly controlled below 0.15%. It is recommended to use Bayer dehydrating agent OF to remove excess water in the coating, solvent or diluent. Aqueous solvents are not suitable for any aluminum silver paste pigments.
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The choice of aluminum silver paste
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The particle size and particle size distribution of aluminum-silver paste pigments have a crucial influence on color, covering power, chromatic effect and gloss. Therefore, particle size distribution is an important parameter that cannot be ignored when choosing aluminum-silver paste. Products with stable particle size and particle size distribution should be selected. Particle size and particle size distribution are not technical parameters for selecting aluminum silver paste. Even if the particle size and particle size distribution are the same, after different surface treatments or different shapes of aluminum flakes, it will lead to color tone, hue or metallic feeling, whiteness, chromatic effect, etc. The difference in optical effect, so what kind of aluminum-silver paste pigment is needed in the end, it is also necessary to make a small sample and compare the sample to determine the reference.

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