pasta de aluminio es un tipo de pasta de pigmento que contiene escamas o polvos de aluminio suspendidos en un solvente. Se utiliza principalmente en diversas industrias por sus propiedades y aplicaciones únicas. A continuación se muestran algunos usos comunes de la pasta de aluminio:Pinturas y revestimientos: se agrega pasta de aluminio a las formulaciones de pinturas y revestimientos para proporcionar efectos metálicos y mejorar su apariencia visual. Las propiedades reflectantes de las hojuelas de aluminio crean un acabado brillante o metálico en las superficies.Industria automotriz: la pasta de aluminio se utiliza en pinturas y revestimientos automotrices para lograr acabados metálicos en automóviles y otros vehículos. Mejora el atractivo estético y da una apariencia reflectante a diversas piezas de automóviles.Tintas de impresión: La pasta de aluminio se utiliza en tintas de impresión, especialmente aquellas utilizadas para efectos de impresión metálicos o reflectantes. Imparte un brillo metálico a los materiales impresos, como envases, etiquetas y gráficos.Películas reflectantes: la pasta de aluminio se incorpora a las películas reflectantes que se utilizan en aplicaciones como películas de espejos, aislamiento reflectante, paneles solares y mantas de emergencia. Las propiedades reflectantes de las hojuelas de aluminio ayudan a reflejar el calor, la luz y la radiación.Materiales de construcción: la pasta de aluminio se utiliza en materiales de construcción como revestimientos arquitectónicos, acabados metálicos y pinturas decorativas. Agrega un brillo metálico a superficies como techos de metal, fachadas de edificios y decoraciones interiores.Electrónica y electrodomésticos: la pasta de aluminio se emplea en la fabricación de componentes electrónicos, placas de circuitos, conexiones eléctricas y piezas de electrodomésticos. Puede ayudar a mejorar la conductividad eléctrica, la disipación de calor y la resistencia a la corrosión de estos materiales.Vale la pena señalar que las aplicaciones específicas de la pasta de aluminio pueden variar según la formulación y los requisitos de las diferentes industrias. Además, el uso de pasta de aluminio debe seguir las pautas de seguridad aplicables, ya que el aluminio puede ser un material inflamable en determinadas formas. 

As a film-forming substance,resin has many advantages,for example: Ⅰ.It can form a continuous, uniform film with certain strength and toughness on the surface of the object, effectively protecting the surface of the object. Ⅱ.It has good resistance to chemical substances such as acid, alkali, and salt, which can extend the service life of the protected object in harsh chemical environments. Ⅲ.The film formed by most resins has low water absorption, which can prevent water penetration and avoid damage to objects due to moisture. Ⅳ.By adding different pigments and additives, coatings of various colors and different glossiness can be obtained to meet different decorative needs. Ⅴ.It can be mixed with a variety of solvents, additives, etc., and by adjusting the formula and processing technology, it can be made into coatings, inks and other products suitable for different construction methods and application scenarios.

1. Solvent: such as butyl acetate, propylene glycol methyl ether, etc. Its function is to dissolve film-forming substances such as resin and adjust the viscosity and drying speed of paint. 2. Resin: Common ones include acrylic resin, polyester resin, etc. Resin is the film-forming substance of paint and determines the basic properties of paint, such as adhesion, hardness, weather resistance, etc. 3. Dispersant: It can reduce the time and energy required for the aluminum silver paste dispersion process, stabilize the aluminum silver paste pre-dispersion, adjust its surface properties and mobility, and prevent the aluminum silver paste particles from agglomerating. 4. Silver powder alignment agent: can ensure the glossiness of the paint and make the paint present a better metallic texture. 5. Leveling agent: silicone leveling agent or acrylic leveling agent can make the paint form a flat and smooth surface during the drying process 6. Anti-settling agent: such as polyamide wax and polyethylene wax, can prevent aluminum silver paste from settling in the paint and maintain the stability of the paint system 7. Other additives: thickeners may be added to adjust the viscosity of the paint as needed, and rust inhibitors and preservatives may be added to improve the anti-corrosion performance of the paint.  

       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)

    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".

       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

  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.