This type of adhesive is specially designed for operation in high-temperature environments that conventional polyurethane cannot withstand. Its core feature lies in its excellent thermal stability.
Main features
Excellent thermal stability: Its key indicator is that it can still maintain sufficient bonding strength and structural integrity at high temperatures. The long-term service temperature usually reaches above 150°C, and specially modified products can even withstand temperatures above 200°C for a short period of time.
Excellent mechanical properties: Even under high-temperature conditions, it can maintain good toughness, impact resistance and peel strength, avoiding stress cracking caused by different thermal expansion coefficients of materials.
Chemical resistance: Generally, it has good resistance to oils, solvents and chemicals.
Application fields: Mainly used in aerospace (such as bonding insulation materials for engine components), automotive industry (bonding parts inside the engine compartment and brake pads), electronics and electrical appliances (bonding high-temperature resistant coils and magnets), as well as in the industrial field for oven sealing and high-temperature filter manufacturing, etc.
2. Polyurethane adhesive for aluminum foil
This is a special adhesive specifically designed for bonding aluminum foil or combining aluminum foil with other materials such as plastic film or paper.
Main features
High adhesion: It has extremely strong wettability and adhesion to the surface of non-polar aluminum foil, and can form a firm bonding layer.
Good flexibility: The formed adhesive film is soft and can adapt to the bending and folding of aluminum foil during processing and use without delamination.
Medium resistance: It can resist the erosion of contents (such as oil, water, and spices in food), ensuring the integrity of the packaging.
Hygiene and safety: When used for food and pharmaceutical packaging, it must comply with relevant hygiene standards, featuring low odor and no solvent residue.
Application fields: Mainly used in the flexible packaging industry, such as the production of composite packaging materials for food (retort bags, liquid packaging), pharmaceuticals (blister packaging, aluminum-plastic composite caps), and other fields.
3. Waterborne polyurethane adhesive
Water-based adhesives are representative of environmentally friendly adhesives and have developed rapidly in recent years.
Main features
Environmental protection and safety: It contains no or very little organic solvents, is non-toxic and non-flammable, and is safe during production and use, with extremely low VOC emissions.
Easy to use: Easy to clean and has little corrosiveness to equipment.
Adjustable performance: Through molecular design, products with different properties ranging from flexible to rigid can be obtained, and they have good adhesion to a variety of substrates.
Limitations: Generally, the drying speed is relatively slow, and the water resistance and initial adhesion may not be as good as solvent-based products. However, significant improvements can be made through cross-linking and other technologies.
Application fields: Widely used in fields with high environmental protection requirements such as wood processing, textile lamination, automotive interiors, footwear, and flexible packaging (such as paper-plastic composites).
4. Polyurethane adhesive for solar cells
This is a special adhesive applied in the manufacturing of photovoltaic modules, which has extremely high requirements for reliability and durability.
Main features
Outstanding weather resistance: It must be able to withstand long-term outdoor exposure to intense sunlight, ultraviolet radiation, drastic temperature changes (-40°C to 85°C), and a humid and hot environment, preventing aging, yellowing, and performance degradation.
High light transmittance: When used for edge sealing of panels or bonding certain components, it is necessary to maintain a high light transmittance to ensure power generation efficiency.
Strong adhesion: It can firmly bond various heterogeneous materials such as glass, backsheet films (such as TPT/TPE), aluminum frames and junction boxes, and buffer thermal stress.
Reliable electrical insulation: Ensuring the electrical safety of components.
Application field: Mainly used for post-lamination sealing of photovoltaic modules, such as bonding aluminum frames to laminates, and bonding junction boxes to backsheets, providing structural fixation, moisture-proof sealing and insulation protection for solar panels, ensuring a service life of over 25 years.
Polyurethane adhesives, through flexible chemical modification, can meet diverse and high-performance bonding demands ranging from extreme high-temperature environments to daily green packaging and the cutting-edge fields of new energy.
