Can water-based glue bond metal?

Water-based glue can bond metal, but you need to choose the right type based on your specific needs and pay attention to the operating conditions. The following is a detailed analysis:

I. Important Considerations
First, if you're using a room-temperature cure method, one of the two surfaces you're bonding must be airtight; otherwise, the glue won't gel.

Second, if both sides of the material you're bonding aren't airtight, you must use a heat cure method, with a temperature of around 80-120°C.

Third, choose the right glue; not all water-based glues are suitable for bonding metal.

II. The Feasibility of Water-Based Adhesives for Metal Bonding
Water-Based Polyurethane Adhesives
This type of adhesive utilizes a high molecular weight design to enhance cohesive strength. While its viscosity is lower than solvent-based adhesives, smaller dispersion particle size increases viscosity, making it suitable for metal bonding. Applications include metal-polyurethane composite bonding for automotive interior components (such as headliners and door panels), and inlay bonding of metal strips to wood (e.g., aluminum-wood adhesive).
Water-Based Pressure-Sensitive Adhesives
Take water-based polyurethane pressure-sensitive adhesives as an example. Its peel strength can reach ≥8 N/cm and initial tack ≥15 N/25 mm. The cured film is flexible, transparent, and exhibits excellent aging and impact resistance. This adhesive is suitable for bonding metal film buttons and plastic nameplates (including metal coatings) on household appliances. However, the following considerations apply:
Applicable Materials: Metals requiring surface treatment (e.g., iron and copper with anti-rust treatment).
Unsuitable Materials: Untreated PE and PP plastics and metals prone to rust.

KL-192 water-based pressure-sensitive adhesive is a water-based emulsion with strong plastic adhesive strength, produced through emulsion polymerization using PVA as a protective colloid and vinyl monomers. It offers excellent heat resistance and storage stability. KL-192 water-based pressure-sensitive adhesive has a wide range of applications and is non-toxic and has no adverse effects on the skin.

Specialized Water-Based Adhesives
Specialized adhesives developed for metal bonding applications (such as water-based adhesives for metal strip inlays) feature fast curing, a transparent, traceless appearance, and easy cleaning. They are suitable for applications such as aluminum-wood bonding and metal strip inlays, achieving operational strength within 2 hours.

III. Application Scenarios and Case Studies
Automotive Industry
Water-based polyurethane adhesives are used for metal-polyurethane composite bonding in areas such as ceilings and door inner panels, meeting environmental and weather resistance requirements.
Decoration Industry
Water-based adhesives for metal strip inlays are used for aluminum-wood bonding and metal strip inlays, achieving fast positioning and a transparent, traceless appearance.
Electronic and Electrical Appliances
Water-based pressure-sensitive adhesives are used for bonding metal film buttons and plastic nameplates (including metal coatings), offering both flexibility and aging resistance. High-temperature working conditions
High-temperature resistant water glass adhesive is used for bonding and repairing metal parts in high-temperature fans, kilns, and other equipment, with a temperature resistance of up to 800°C.