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Performance and Application Scope of Automotive Interior Adhesives
Release time:
2020-07-17
1. Automotive interior adhesive - What is the application range of water-based adhesives?
Water-based adhesives have a wide range of applications, including automotive and pressure-sensitive adhesives. Whether or not there are limitations in the materials depends on the performance requirements we need to meet. For example, when low-temperature performance—such as tensile strength and adhesive strength—is required, polyurethane may be more suitable.
2. Automotive Interior Adhesive—What are the applications of waterborne polyurethane adhesives in automotive interiors? What are the key application points and performance requirements?
Waterborne polyurethane adhesives not only reduce emissions of volatile organic compounds but also deliver performance comparable to that of solvent-based systems. To give a few examples, polyurethane adhesives—used for applications such as trim panels, door panels, and cockpit ceilings—have already been widely adopted.
3. Automotive interior adhesive - Many car interiors use polypropylene materials. What are the solutions for polypropylene materials?
PP material is a challenging substrate for adhesion. Just as in the coatings industry, where glue application on PP materials requires pretreatment of the substrate—such as flame treatment or arc treatment—this pre-treatment enables the material to better bond with water-based adhesives. Currently, an effective solution is to apply Jingsheng polypropylene treatment agent between the substrate and the adhesive, thereby enhancing the adhesion between the polypropylene substrate and the adhesive and preventing delamination.
4. Automotive interior adhesive - The adhesion range of water-based adhesives and their requirements for substrates?
Basically, the adhesion and bonding strength can be comparable to those of solvent-based systems. As for substrate requirements, given water’s relatively high surface tension, the substrate must first be clean and free of any oils or contaminants. For substrates with very low surface energy—such as certain polypropylene materials—we may need to perform surface treatments, like flame or corona treatment. If rigorous durability testing is required, by carefully selecting materials and adjusting the formulation, we can meet environmental durability standards and achieve performance levels comparable to those of two-component solvent-based systems.
5. Automotive interior adhesive - Can water-based adhesives be used on metal materials?
Water-based adhesives can be used to bond metallic materials, and water-based polyurethanes can also be used to bond metallic materials.
The viscosity of water-based adhesives does not vary with changes in polymer molecular weight; therefore, the polymer can be quantified to enhance its bonding strength. However, their viscosity is generally lower than that of solvent-based adhesives. Nevertheless, when the particle size of the dispersion is smaller, the viscosity of water-based adhesives increases. While drying is slower than that of solvent-based adhesives, water-based adhesives are easy to prepare and clean, non-flammable, and environmentally friendly.
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