Aluminium paste is a type of pigment paste that contains aluminum flakes or powders suspended in a solvent. It is primarily used in various industries for its unique properties and applications. Here are some common uses of aluminium paste: Paint and Coatings: Aluminium paste is added to paint and coating formulations to provide metallic effects and improve their visual appearance. The reflective properties of the aluminum flakes create a shiny or metallic finish on surfaces. Automotive Industry: Aluminium paste is used in automotive paints and coatings to achieve metallic finishes on cars and other vehicles. It enhances the aesthetic appeal and gives a reflective appearance to various automotive parts. Printing Inks: Aluminium paste is utilized in printing inks, especially those used for metallic or reflective printing effects. It imparts a metallic sheen to the printed materials such as packaging, labels, and graphics. Reflective Films: Aluminium paste is incorporated into reflective films used in applications like mirror films, reflective insulation, solar panels, and emergency blankets. The reflective properties of the aluminum flakes help in reflecting heat, light, and radiation. Construction Materials: Aluminium paste finds use in construction materials such as architectural coatings, metal finishes, and decorative paints. It adds a metallic luster to surfaces like metal roofs, building facades, and interior decorations. Electronics and Appliances: Aluminium paste is employed in manufacturing electronic components, circuit boards, electrical connections, and appliance parts. It can help in enhancing the electrical conductivity, heat dissipation, and corrosion resistance of these materials. It's worth noting that the specific applications of aluminium paste can vary depending on the formulation and the requirements of different industries. Additionally, the use of aluminium paste should follow applicable safety guidelines as aluminum can be a flammable material in certain forms.

  Lubricants must be added at all stages of the production process to prevent from clumping, which has a unique effect on the wetting properties of metallic pigments.There are obvious differences in wetting properties between between leafing type and non-leafing type.   Leafing pigments       Due to their high surface tension leafing pigments are not wetted by the binder and therefore float on the wet film. This effect is achieved by the use of e.g. stearic acid as lubricant .       In paint systems with strongly polar solvents or binders there is always a danger that the leafing pigments will "drown" through wetting and turn into non-leafing pigments. This possibility must betaken into account       when drawing up the formula of paints. If necessary special leafing stabilized pigments should be used.   Non-leafing pigments       Non-leafing pigments are created either by the addition of strongly polar substances or wetting agents to leafing pigments or by the use of special lubricants (e.g. oleic acid) directly in the milling process.       Non-leafing pigments are completely wetted and thus spread evenly throughout the entire paint film.  

       The ductile nature of the metal sused means that milling or crushing of spherical aluminum powder in the ball mill creates flakes with shape factors (flake thickness: flake diameter ) of 1:50 to 1:200.        Silver Dollar Shape: Using fine-grained spherical aluminum powder with extremely narrow particle size, after slow grinding process, we can get aluminum sheets with smooth surface, moderate diameter-thickness ratio, narrow particle size distribution, high sparkle and strong hiding power.         Snowflake and Scale Shape: They are made by grinding aluminum powder with coarser particle size. Statistical particle thickness can vary depending on the product and the milling technology used, i.e. the various pigments are not monodisperse particles but heterodisperse systems with a more or less statistical distribution of particle sizes and thicknesses.         Particle size distribution in metallic pigments has a decisive influence on the optical properties of the applications. It is essential, therefore, to measure particle size distribution for quality control and in order to classify the pigments, the anisotropy of the flakes makes this in difficulty

    Brilliance, brightness, colour saturation, coverage, flop and DOl - depend not only on particles and particle size distribution, but also on the orientation of the aluminium flakes in the paint film. Best effects are achieved when the flakes lie parallel to the surface of the film. Poor orientation :leads to"clouding" or to an uneven "salt and pepper" effect. The evaporation of the solvent causes the film t。shrink and virtually press the aluminium paste into a horizontal position.     The higher the solvent content of the paint, the more pronounced this effect is. This explains the observed phenomenon that pigment orientation and thus the optical properties of" low solid paints"are considerabl'y better than those of high solid paints".

       Before use, pre-disperse the aluminum paste with the solvent. Generally, the ratio of aluminum paste to solvent is 1:2. During the dispersion process, use low-speed stirring. Avoid stirring too fast, which will cause high shear force to destroy the shape of the aluminum paste and reduce the brightness. The best dispersion speed should be determined through experiments. This depends on many factors and the geometric dimensions of the stirring equipment (ratio of the diameter of the stirring disk to the diameter of the container, the shape of the stirring disk, etc.), temperature and viscosity of the coating, solvent selection and the amount of aluminum paste added (see the table below)