What are some hot melt adhesives that do not require heating?

Hot melt adhesives that do not require heating are primarily reactive PUR (polyurethane) hot melt adhesives. Their curing mechanism and characteristics are as follows:

1. Curing Principle of Reactive PUR Hot Melt Adhesives
Moisture Curing: After being applied in a molten state, the PUR hot melt adhesive undergoes a chemical reaction (cross-linking curing) by absorbing moisture from the air, forming an irreversible, high-strength adhesive layer. This process requires no external heating and relies solely on ambient humidity.

Dual Physical and Chemical Curing: Initially, physical curing (rapid positioning) is achieved through cooling, followed by chemical curing through a moisture reaction (improving temperature and solvent resistance).

2. KL-21 PUR Hot Melt Adhesive
No Heating Equipment Required: Offers advantages such as fast positioning, strong adhesion, and wide application range. Primarily used for bonding materials such as aluminum, ABS, PC, and glass, it is widely used in the automotive, electronics, and furniture industries.

3. Core Advantages
No Heating Equipment Required: Eliminates the need for heating tools such as hot melt glue guns and spray guns, reducing operational complexity and equipment costs. High-strength adhesion: After chemical cross-linking, the bond strength is significantly higher than traditional thermoplastic hot melt adhesives (such as EVA), making it a viable alternative to structural adhesives.

Excellent temperature resistance: The cured adhesive layer can withstand temperatures ranging from -40℃ to 150℃, suitable for extreme environments.

Solvent and water resistance: The chemically cross-linked structure provides excellent resistance to organic solvents and moisture.

Environmentally friendly: No solvent evaporation, compliant with RoHS and other environmental standards, reducing occupational health risks.

4. Typical Application Scenarios

Consumer electronics: Mobile phone frame and screen bonding, earphone assembly, smartwatch frame sealing, etc.

Automotive industry: Interior component bonding, headlight assembly, battery pack sealing (requiring high temperature and vibration resistance).

Packaging: Sealing of high-end product packaging boxes (such as cosmetics and electronic products).

Repair and DIY: Electronic component repair, handmade model making, etc.