Which scenarios require the use of polyurethane adhesive
Polyurethane adhesives (PU adhesives) are divided into single component moisture curing, two-component reactive, solvent-free composite adhesives, water-based PU adhesives, and PUR reactive hot melt adhesives. The core characteristics are broad-spectrum compatibility of the substrate, flexible adhesive layer, impact resistance, sealability, water and oil resistance, and good adaptability to high a
Polyurethane adhesives (PU adhesives) are divided into single component moisture curing, two-component reactive, solvent-free composite adhesives, water-based PU adhesives, and PUR reactive hot melt adhesives. The core characteristics are broad-spectrum compatibility of the substrate, flexible adhesive layer, impact resistance, sealability, water and oil resistance, and good adaptability to high and low temperatures. They can be used as flexible composite adhesives or structural adhesives to withstand dynamic loads, making them suitable for bonding dissimilar materials.
1、 Soft packaging and composite packaging industry
1. Dry composite of flexible packaging for food, daily chemical, and pharmaceutical industries: solvent-free polyurethane composite adhesive is the mainstream, used for multi-layer composite of PET, BOPP, nylon, aluminum foil, CPP, and PE films, producing vacuum bags, high-temperature cooking bags, aluminum foil bags, sauce packaging, and drug composite films. It is resistant to cooking, content erosion, and low residue to meet food contact requirements.
2. Paper plastic composite, label composite, express bag, gift box liner composite; PUR hot melt adhesive is used for high-speed laminating and color box sealing.
3. Electronic shielding film, anti-static film, functional film composite, matched with electronic packaging material production.
2、 Textile printing and dyeing, shoe materials, leather industry
1. Fabric composite: waterproof and breathable composite for clothing jackets, home textile curtains, sofa leather, automotive interior fabric, foam+non-woven composite, mainly water-based PU adhesive and PUR composite adhesive, with a soft touch, water resistance, and dry cleaning resistance.
2. Shoe material bonding: The outsole of sports shoes and casual shoes is attached to the upper, midsole, and insole, and rubber is used EVA、TPU、 Microfiber leather is bonded to each other and repeatedly bent without opening, making it the core adhesive for shoes; Also used for flocking, leather embossing, and bag fabric bonding.
3. Industrial textiles: tarpaulin, filter cloth, geotextile, conveyor belt surface composite.
3、 Woodworking furniture, prefabricated building materials
1. Solid wood panel, finger joint, integrated material, laminated wood (CLT) structural bonding, formaldehyde free polyurethane adhesive instead of urea formaldehyde adhesive, high water resistance level, suitable for kitchen cabinets, bathroom cabinets, outdoor furniture.
2. PUR edge sealing: Fully automatic edge sealing for panel furniture, heat-resistant, moisture resistant, and not easy to open, is a standard configuration for panel lines.
3. Composite insulation board, stone, bamboo wood fiber wall panel, floor paving bonding, and repair of floor cracks.
4、 Automobile, rail transit, new energy transportation
1. Adhesive sealing of car windshields and side windows (single component moisture cured PU adhesive), taking into account structural load-bearing, sealing, and shock absorption;
2. Interior composite: roof, door panels, dashboard, floor mats, seat foam, leather, felt, non-woven fabric bonding;
3. Lightweight component bonding: Structural bonding of SMC, FRP fiberglass composite materials, plastics, and aluminum alloy dissimilar materials;
4. Power battery PACK: module foam bonding, insulation pad composite, shell sealing, wire harness fixing, requiring low precipitation, electrolyte resistance, and flame retardancy;
5. Bonding and sealing of interior, floor, and sound insulation components of passenger cars and high-speed railway carriages.
5、 Wind power and composite materials fields
Composite material bonding of fan blade main beam, web plate, and blade root; Assembly and bonding of fiberglass products, yacht and RV shells, and fiberglass pipelines; Compared to epoxy adhesive, it has lower heat release and reduces the risk of thermal stress cracking in large components.
6、 Electronic appliances, precision components scene
1. PCB、 Power module, sensor encapsulation, module encapsulation, flexible encapsulation PU adhesive can buffer vibration stress;
2. Flexible bonding of display screens, backlight modules, and lenses;
3. Electronic auxiliary foam, conductive foam EVA、 Silicone pad back adhesive composite;
4. Sealing and fixing of wire and connector components; Low volatility and low ion precipitation models can be selected for ESD clean areas;
Differentiation: Hard structural load-bearing components often use epoxy; Priority should be given to polyurethane for shock absorption, drop resistance, and flexible bonding.
7、 Construction project scenario
1. Sealing of doors, windows, curtain wall joints, and expansion joints;
2. Bonding of elastic layers on floors, tracks, and courts;
3. Insulation integrated board, color steel sandwich panel core material and panel composite;
4. Concrete crack repair, steel structure anti-corrosion protection layer bonding;
5. Assembled prefabricated components with joint sealing and waterproofing.
8、 Medical and daily necessities industry
1. Medical dressings, breathable film composites, and flexible adhesive for wearable sensors (medical grade PU);
2. Beauty eggs, powder puff flocking, false eyelash glue, wig bonding (water-based hypoallergenic PU);
3. Adhesive bonding of yoga mats, anti slip mats, and rubber components for fitness equipment.
9、 General industrial assembly scenario
1. Adhesive bonding of different materials such as rubber, silicone, metal, plastic, and ceramic (many adhesives cannot move rubber, PU has obvious advantages);
2. Adhesive bonding of equipment shock pads, buffer blocks, and conveyor belt joints;
3. Composite bonding of container and refrigerated compartment panels.
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