What are monomers?
Monomers are small, reactive molecules that can bond with other monomers to form polymers, which are the foundation of many adhesive systems. In simpler terms, monomers are essentially the building blocks of polymers, which are critical in many adhesive technologies for creating a strong, durable bond. Monomers are often seen as harmful for your health and many cause irritation to the eyes, skin, and respiratory system.
What are low monomer adhesives?
Low monomer adhesives refer to a specific category of adhesives that contain fewer monomers in their chemical composition. In traditional adhesives, monomers are necessary for curing and bonding, but they can pose challenges in terms of safety, durability, and environmental impact. Low monomer adhesives aim to minimise these challenges by limiting the concentration of these reactive compounds.
Key Features
- One of the advantages of low monomer adhesives is the reduction in volatile organic compounds (VOCs). High levels of VOCs, which are common in conventional adhesives, can contribute to air pollution, cause unpleasant odours, and pose health risks to those using the adhesive in poorly ventilated areas. By lowering the monomer content, manufacturers can reduce the release of VOCs during application.
- Monomers in adhesives, particularly in certain types of cyanoacrylates or epoxy-based adhesives, can cause irritation to the skin, eyes, and respiratory system. Low monomer adhesives help alleviate these risks by reducing the potential for interaction with monomers, making them safer to handle, especially in industrial environments where personnel are regularly exposed.
- The emergence of more eco-friendly products is a growing trend across industries, and low monomer adhesives contribute to this by providing adhesives with lower environmental impact. Reduced monomer levels mean lower emissions of harmful chemicals, making these adhesives more suitable for use in products or applications where sustainability is a priority.
- Low monomer adhesives are increasingly utilised in industries that require high levels of cleanliness, safety, and precision, such as the medical, electronics, and aerospace industries. For instance, in medical devices adhesives with minimal monomers are preferred to avoid potential adverse reactions in patients. In electronics, the stability and purity of the adhesive can significantly affect the performance and longevity of components.
Types of Low Monomer Adhesives
Cyanoacrylates
Cyanoacrylate adhesives, commonly known as super glues, are known for their fast-bonding capabilities. However, traditional cyanoacrylates contain high levels of monomers, which can cause irritation. Low monomer cyanoacrylates reduce these issues, making them more user-friendly and suitable for non-industrial environments.
Polyurethane (PU) Adhesives
Polyurethane adhesives can be formulated as low monomer adhesives by reducing the levels of isocyanates, which are the reactive monomers typically present in PU systems. These adhesives are widely used for bonding various materials, such as plastics, metals, and wood. Low monomer polyurethane adhesives are more advantageous to handle, reduce VOC emissions, and still provide excellent flexibility, impact resistance, and durability.
Low monomer adhesives are an innovative solution for industries seeking safer, more environmentally friendly, and high-performing adhesive products. By reducing the presence of monomers, these adhesives provide lower VOC emissions, improved safety for users, enhanced bond durability, and enhanced compatibility with sustainable practices. As regulations regarding chemical use become rigorous and consumer awareness of product safety grows, low monomer adhesives are likely to become more widely adopted in various industries.
