6 Different Types of Adhesives

1st July 2024

There are many types of adhesives, with the most common ones being urea-formaldehyde resin adhesives, polyvinyl acetate adhesives, acrylic resin adhesives, polyurethane adhesives, hot melt adhesives, epoxy resin adhesives, and synthetic adhesives. Based on their applications, they can be categorized into sealants, construction adhesives, automotive adhesives, packaging adhesives, and shoe adhesives. Here, we will introduce six main types of adhesives in different applications.

1. Silicone Adhesives

Silicone adhesives are single-component, translucent paste-like adhesives that cure at room temperature to form high-performance elastomers. They exhibit excellent resistance to extreme temperatures, aging, and electrical insulation properties, and provide good adhesion to most metals and non-metal materials.

2.  Polyurethane Adhesives

Polyurethane adhesives contain urethane groups (-NHCOO-) or isocyanate groups (-NCO-) in their molecular chains. They come in two basic types: single-component and two-component. Single-component adhesives cure with moisture and are easy to apply but cure slowly. Two-component adhesives cure quickly and offer superior performance but require preparation before use, making the process more complex. Polyurethane adhesives can bond various materials and maintain their physical and chemical properties even at low or extremely low temperatures. They are primarily used in the footwear, packaging, automotive, and magnetic recording material industries.

Doxu Chemical provides the isocyanate crosslinkers/ hardeners for adhesives in footwear and flexible packaing.

Product SA-1003 SA-1007 SA-1009
NCO% 7.2±0.3 7.5±0.3 4.2±0.3
Solid Content% 40 40 20±1
Density at 20 ℃ 1.04 1.04 1.04
Viscosity at 23℃ 11 11 11
Solvent Ethyl Acetate Ethyl Acetate Ethyl Acetate
Monomeri Content% <0.1 <0.1 <0.1
Features Higher Tension Higher Tension Betternon yellowing

3. Acrylic Resin

Acrylic resin is a colorless or slightly yellow solid known for its excellent transparency and gloss. It has good weather resistance, chemical stability, and corrosion resistance, as well as good adhesion and wear resistance. Acrylic resin is mainly used in the production of pressure-sensitive adhesives and is also applied in the textile and construction fields.

4. Hot Melt Adhesives

Hot melt adhesives can be classified into EVA hot melt adhesives, polyamide hot melt adhesives, polyester hot melt adhesives, and polyolefin hot melt adhesives, depending on the raw materials. Currently, EVA hot melt adhesives are the most commonly produced and used in China. Polyolefin adhesives primarily use ethylene series, SBS, and SIS copolymers as raw materials.

5. Epoxy Adhesives

Epoxy adhesives are engineering adhesives made from epoxy resin base materials, curing agents, diluents, accelerators, and fillers. Due to their excellent adhesion, functional properties, affordability, and simple application process, epoxy adhesives are widely used in household appliances, automotive, water transportation, electronics, and aerospace industries. They can bond metals and most non-metal materials.

6. Urea-Formaldehyde, Phenolic, and Melamine-Formaldehyde Adhesives

These adhesives are mainly used in the wood processing industry and tend to release higher levels of formaldehyde than international standards permit. They are used in the manufacture of medium-density fiberboard, gypsum board, plywood, and particleboard.

polyurethane adhesives