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Under normal conditions, well-sealed aluminum silver paste can be used for over a year.
The most crucial step in using aluminum silver paste is dispersion. Typically, we disperse the aluminum silver paste in some solvents. If some wetting agents can be added, let it soak for a while, then stir slowly to form a uniform liquid. This can then be added to pre-prepared coatings to achieve optimal results. During aluminum silver paste dispersion, high-shear mixing must never be used, as it can deform the thin aluminum flakes, affecting the appearance. Therefore, slow-speed stirring methods must always be used. If the coating has an excessively high acid value, it will reduce the storage stability of the coating, causing it to turn black and thicken.
In conductive aluminum silver paste, solvents serve to dissolve the resin, enabling the conductive particles to disperse fully within the polymer; regulate the viscosity and viscosity stability of the conductive paste; determine the drying speed; and improve the surface condition of the substrate, ensuring good adhesion between the paste and the base material. The solubility and polarity of the solvent in the conductive silver paste are crucial selection parameters because the solvent significantly impacts printability and the adhesion/curing on the substrate.
Additionally, factors such as the solvent’s boiling point, saturated vapor pressure, and toxicity to humans must be considered. The boiling point and saturated vapor pressure are closely related to the stability of the printed material and operational durability. They also decisively influence the temperature and rate of heating and curing. Generally, high-boiling-point solvents are used, commonly including BCA (Butyl Cellosolve Acetate), diethylene glycol butyl ether acetate, diethylene glycol ethyl ether acetate, and isophorone. Additives in conductive aluminum silver paste primarily include dispersants, leveling agents, oxygen protectants, and stabilizers for the metal particles.
Transportation and Storage Methods for Aluminum Silver Paste:
1. Aluminum pigments must be stored separately from water, alkalis, and acids to prevent chemical reactions upon contact. In case of fire, use chemical powder fire extinguishers; water must not be used for firefighting.
2. Due to their metallic and chemical properties, aluminum silver paste metal pigments should be stored in sealed containers in a well-ventilated, dry indoor area (15°C – 40°C), protected from sunlight and rain. They should be used as soon as possible after opening. After use, the container should be sealed immediately to prevent solvent and Tego additives from evaporating. If stored for too long, they should be tested beforehand to prevent the aluminum pigment from turning gray, drying out, or experiencing reduced dispersibility.
3. Improper handling during storage or transportation may cause partial separation of the aluminum and solvent components. Therefore, before use, the paste should be stirred thoroughly to ensure uniform mixing of the separated components.
Safety Storage Instructions for Aluminum Silver Paste:
1. Store in sealed containers indoors at a temperature between 15°C and 40°C. Protect from direct exposure to sunlight, rain, or excessively high temperatures.
2. Ensure the storage temperature does not fall below 15°C (special attention is needed in winter or when ambient temperatures are 10°C or lower).
3. Excessive vibration during transport or storage under certain conditions may cause partial separation of the aluminum and solvent components. Therefore, during application, high-speed stirring must be avoided to prevent damaging the shape of the silver flakes.
