With the rapid development of automobiles, the improvement of automotive interior quality has become an important indicator for consumers to choose automobiles. Automotive interiors refer to car headliners, carpets, floor mats, instrument panels, interior door panels, seats, trunk racks and spare tire covers, etc., in which glue plays an important role.
Polyurethane adhesive contains a large number of polar groups and reactive groups, and is an adhesive containing a urethane group (-NHCOO-) or isocyanate group (-NCO-) in the molecular chain, which can form strong chemical bonds with a variety of substrates after curing. It is made by the reaction of isocyanate and polyol, its molecular structure is alternately arranged in soft and hard segments, a wide range of performance adjustments, a variety of bondable materials, and the use of simple technology, with excellent mechanical properties and elasticity, in the manufacture of automotive interior parts, polyurethane adhesives can achieve efficient bonding between different materials.
Car headliners
As part of the vehicle's interior, the headliner plays an important role in protecting the occupants and providing sound and heat insulation. The polyurethane adhesive backbone is very flexible, has excellent resistance to impact vibration and bending fatigue and has high peel strength, which can slow down the impact of vibration on the ceiling, maintain the integrity of the ceiling, and avoid breaking or falling off.
Secondly, due to the strong polarity of isocyanate and urethane groups, it has high reactivity and adhesion, which can be quickly positioned and firmly bond the ceiling panel with the top structural material (such as metal or plastic), ensuring that the ceiling is stable and durable for a long time in various complex environments.
In addition, waterborne polyurethane adhesives can fill the tiny gaps between the roof panel and the top structural material and form a sealing layer to prevent moisture, dust and noise from penetrating into the vehicle. This sealing layer can provide a certain amount of sound and heat insulation, improving the comfort and quietness of the vehicle's interior.
Automotive door trim panels
Automobile door trim panels are basically composed of a skeleton, foam, and surface fabric. The common materials of the door frame are ABS plastic, modified polypropylene (PP), and hemp fiberboard. The middle foam buffer layer is PU flexible foam, PP foam, polyethylene (PE) foam or polyvinyl chloride (PVC) foam. The surface fabrics are genuine leather, artificial leather (PVC, PU or thermoplastic polyolefin (TPO)) and knitted fabrics. Due to the increasingly strict regulations on materials at home and abroad, the combination of modified PP integrated materials, that is, PP skeleton, PP foam TPO skin, is more and more used. Polyurethane glue contains highly polar isocyanate and urethane groups, which gives it high adhesion and high adhesion to a variety of materials such as metal, rubber, plastic, wood, weaving, leather, etc. Even for weakly polar PP materials, which are difficult to adhere, it has a good adhesion effect after corona or plasma treatment of the substrate.
Car seats
As an important part of the vehicle interior, car seats play a key role in the comfort and safety of drivers and passengers. In order to guarantee the quality and performance of car seats, choosing the right adhesive is essential for the manufacture and assembly of the seat. Polyurethane adhesives with strong adhesion ability, excellent durability and good manufacturability are also becoming more and more common in car seats.
Car seats usually consist of a variety of materials like leather, fabric, plastic, etc. Polyurethane adhesives form strong chemical bonds to a variety of substrates after curing, providing high adhesion to a wide range of materials, ensuring that the various components of the seat are firmly bonded together to provide solid support and structural strength.
In the face of vibration and impact during vehicle driving, the polyurethane adhesive backbone chain is very flexible, which can provide better cushioning effect for the seat, reduce the pressure and fatigue on the body for long-term driving, and ensure the safety and comfort of passengers.
Secondly, car seats tend to have a long service life and are subject to environmental factors such as sunlight, high temperatures, low temperatures, and humidity. Polyurethane adhesives have good weather resistance, can resist UV erosion and harsh climatic conditions, and reduce the aging and damage of materials. At the same time, polyurethane adhesives are also chemically resistant, which can resist chemical contaminants that may be present in the interior of the car, improving the durability and longevity of the seat.
Finally, polyurethane adhesives are also environmentally friendly in car seat applications. Polyurethane adhesive is a solvent-free adhesive that reduces the risk of contamination to the environment and the human body by reducing the use of organic solvents. Compared to traditional solvent-based adhesives, polyurethane adhesives have lower VOC (volatile organic compound) emissions and have a lower impact on air quality.
With the improvement of environmental protection regulations and the enhancement of people's awareness of environmental protection, other interior adhesives such as car trunks, spare tire covers, door and window seals are gradually replacing the previous solvent-based adhesives with polyurethane adhesives, especially the promotion and application of PUR hot melt adhesives and water-based polyurethane automotive interior adhesives is imperative.
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