ã€China Aluminum Industry Network】 1. Aluminum paste disperses paint powders containing aluminum pigments to achieve excellent gloss, flicker, brightness, hiding power, tinting strength, flop effect, vividness, floatability, etc. Performance must be well dispersed, but attention should be paid to the following tips and suggestions when it is dispersed:
Tip: Aluminum scales are easy to bend and break. If high-speed stirring or other continuous and violent processing is applied in the paint production process, the geometric structure can be easily destroyed, and even coarse grains, dark colors, reduced hiding power, and metal migration can occur. Therefore, high-shear dispersion methods should not be used.
Recommendation: It is recommended to use a pre-dispersed method: first select the appropriate solvent or a mixture of several solvents. The ratio of aluminum slurry to solvent is 1:1 or 1:2, the solvent is added to the aluminum slurry, and the mixture is slowly stirred until it is even (about 10-20 minutes). A wetting agent or dispersant is added to the system.
2. Resin System Many commonly used coating bases, such as oily varnish bases, acrylates, alkyd, epoxy, polyurethane and waterborne bases, can be applied to floating and non-leafing aluminum silver pigments. In general, any coating base or solvent is compatible with the solvent of the aluminum silver paste, and it is not suitable to cause chemical damage to the aluminum paste. It is worth noting that aluminum is an amphoteric metal and the acid value of the paint should be controlled below 7.
Solvent Selection The choice of flux is primarily determined by the formulation of the paint. 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 floated aluminum paste can only use non-polar solvents, and is preferably a high surface tension aliphatic or aromatic solvent, especially petroleum spirit, diphenyl, toluene and high flash point naphtha because they Can promote excellent floatability. Water reacts with aluminum to produce hydrogen, which causes up-listening effects. Therefore, the amount of water in the paint should be strictly controlled to be less than 0.15%. It is recommended to use Bayer dehydrant OF to remove excess water from the coating, solvent, or diluent. Aqueous solvents are not suitable for use with any aluminum silver pigment.
The choice of aluminum silver paste size and size distribution of aluminum silver paste pigments have a crucial influence on color, hiding power, flop effect and gloss, so the particle size distribution is an important parameter that can not be ignored when selecting aluminum silver paste. In the selection of aluminum paste should choose a product with a stable particle size and particle size distribution. Particle size and particle size distribution are not the technical parameters for selecting aluminum paste. Even if the particle size and particle size distribution are the same, after different surface treatments or aluminum flake shapes, the color tone, hue or metal sense, whiteness, flop effect, etc. Due to the difference in optical effects, it is necessary to determine what kind of aluminum-silver pigments are needed at the end of the process.
Medium and Trace elements are necessary for plant growth, but relatively small amounts of elements, mainly CaO, iron, copper, zinc, manganese, molybdenum, boron and so on. Trace elements are small in the body of the crop, but because they are often part of the enzyme or coenzyme within the plant, they are highly specific and are indispensable and irreplaceable for crop growth and development.
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