The main reason for switching from solvent-based polyurethane adhesive to water-based polyurethane adhesive in automotive interior adhesive is due to environmental and health considerations. Traditional solvent-based polyurethane adhesives contain volatile organic compounds (VOCs), which can have negative effects on the environment and human health. Water-based polyurethane adhesive can effectively reduce indoor air pollution, protecting human health. In addition, water-based polyurethane adhesive have advantages such as ease of use, fast drying, and high bonding strength, making them increasingly favored in the application of automotive interior trim.

When using water-based systems for automotive interior adhesive, there are several aspects to consider:

1. Difference in shelf life: Solvent-based polyurethane adhesives are often judged based on changes in viscosity to determine their shelf life, while water-based polyurethane adhesive for automotive interior adhesive cannot be determined based on viscosity changes and generally have a shelf life of 4 to 6 hours.
2. Storage conditions: The optimal storage conditions for water-based polyurethane adhesive forautomotive interior adhesive are between 5 to 30°C. It is important to prevent freezing to avoid damaging the adhesive.
3. Spray gun selection and spraying pressure: Due to the lower viscosity of water-based polyurethane adhesive for automotive interior adhesive, low-pressure spray guns with a nozzle diameter of 1.3 to 2mm are recommended, with a spraying pressure of 1 to 2 bar. For users who currently use solvent-based adhesives and want to switch to water-based polyurethane adhesive for automotive interior adhesive, it is important to not only replace the adhesive but also consider adjusting relevant process parameters.