Teach you how to correctly choose engineering adhesives!
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Select adhesives based on the chemical properties of the substrate to be bonded:
For polar materials (such as steel, aluminum, titanium, magnesium, ceramics, etc.), it is recommended to use adhesives with strong polarity, such as epoxy resin adhesives, polyurethane adhesives, phenolic resin adhesives, acrylate adhesives, and inorganic adhesives.
When bonding weakly polar or non - polar materials (such as paraffin, asphalt, polyethylene, polypropylene, polystyrene, ABS, etc.), acrylic adhesives, unsaturated polyester adhesives, or solvents that can dissolve the substrate to be bonded are good choices.
Select adhesives according to the physical properties of the substrate to be bonded:
For brittle or rigid materials (such as ceramics, glass, cement, and stone), it is recommended to use thermosetting resin adhesives with high strength, high hardness, and low deformability. Common ones include epoxy resin adhesives, phenolic resin adhesives, and unsaturated resin adhesives.
When bonding elastic or ductile materials (such as rubber, leather, plastic, film, etc.), adhesives with good elasticity and certain toughness should be selected, such as neoprene adhesives, polyurethane adhesives, modified silane adhesives, and rubber - type adhesives.
When dealing with porous materials (such as foam plastics, sponges, fabrics, etc.), adhesives with high viscosity should be selected, including epoxy resin adhesives, polyurethane adhesives, modified silane adhesives, hot - melt adhesives, polyvinyl acetate adhesives, and rubber - type adhesives.
In addition, adhesives should be selected based on the expansion coefficient of the substrate. In most cases, the expansion coefficients of most substrates are similar at room temperature, and detailed consideration may not be necessary. However, in high - or low - temperature environments, or when the bonding area is large, it is necessary to ensure that the expansion coefficient of the adhesive is similar to that of the substrate.
Select adhesives in combination with the process method:
When using the perfusion process, adhesives without solvents and with low viscosity are generally selected.
When performing sealing or large - area bonding, processes such as scraping and dot - coating are often used, and paste - like or putty - like adhesives are more suitable at this time.
For bonding, sealing, or repairing precise and fine contact surfaces, liquid adhesives are a better choice.
Select adhesives according to the product usage environment:
Select adhesives according to the product usage temperature. For example, at room temperature, most adhesives such as hot - melt adhesives and instant adhesives can meet the requirements. According to the information from Coating Online, epoxy resin is suitable for use below 120°C; rubber adhesives are suitable for use below 80°C; silicone adhesives can function below 200°C.
Select adhesives based on the natural environment in which the product is used. If it is in an outdoor environment with factors such as heat, cold, humidity, dryness, and ultraviolet radiation, the weather resistance of the adhesive must be considered. Silicone adhesives, epoxy adhesives, polyurethane adhesives, modified silane adhesives, etc. are all good choices.
Select adhesives according to the chemical environment in which the product is used, such as in the presence of acids, alkalis, salts, oils, gases, and other factors.
Select adhesives according to the physical environment in which the product is used, such as the stress, vibration, and pressure on the bonded part.
Select adhesives based on special functional requirements: If there are specific requirements such as bonding, sealing, electrical conductivity, insulation, flame retardancy, thermal insulation, thermal conductivity, and leakage prevention, adhesives with corresponding functions need to be selected.
