Polyolefin adhesives are becoming increasingly popular due to their exceptional bonding capabilities and versatility in various applications. This comprehensive guide will explore the different types of polyolefin adhesives, their properties, and the various applications they are suited for.
Polyolefins are a class of thermoplastic polymers that include materials such as polyethylene and polypropylene. These polymers are known for their excellent resistance to solvents, low surface energies, and overall durability. However, their low surface energies make them notoriously difficult to bond without the use of specialized adhesives or surface treatments.
There are various types of polyolefin adhesives available in the market, each with their own unique properties and applications. Some of the most popular polyolefin adhesives include:
Cyanoacrylates are a type of adhesive that can be used to bond polyolefins when used in combination with a polyolefin primer. These adhesives create a strong bond with good shear strength and resistance to non-polar solvents, such as motor oil and gasoline. However, they have low impact strength and may not be suitable for applications requiring high impact resistance.
Acrylic adhesives, such as the Permabond TA46XX series, are well suited for bonding polyolefins that require higher impact strength or resistance to water and other polar solvents. These adhesives can be easily dispensed from a dual cartridge, eliminating the need for mixing. They bond a wide range of substrates, including PTFE and silicone rubber, without the need for surface treatment or primers.
Amorphous polyolefin hot melt adhesives are a popular choice for bonding polyolefin substrates, particularly in the packaging and non-woven industries. They provide excellent barrier properties and chemical resistance, making them suitable for a wide range of applications. APOs can be formulated with various melt viscosities, hardness, softening points, surface tackiness, and open times, allowing for customization based on the specific requirements of a project.
BONDiT™ adhesives are a range of products specifically designed for bonding polyolefins to various substrates, including metals, ceramics, and other thermoplastics. These adhesives are ideal for applications requiring long-term durability and resistance to harsh environments. BONDiT™ adhesives include products such as B-45TH, B-482TH, B-4682, and B-536TH, each offering varying levels of chemical resistance, bond strength, impact and vibration resistance, heat resistance, and coefficient of expansion compatibility.
In order to achieve a strong bond between polyolefins and other substrates, proper surface preparation is essential. Common surface treatment methods for polyolefins include chemical etching, flame treatments, corona discharge, and gas plasma. These treatments improve the adhesive wetting on the polyolefin surface, allowing for a more secure bond.
Some adhesives, such as the BONDiT™ series or Permabond TA46XX series, do not require surface treatment or primers, simplifying the bonding process and reducing overall costs.
Polyolefin adhesives are used in a wide range of industries and applications, some of which include:
Polyolefin adhesives, particularly APO hot melts, are widely used in packaging applications, such as adhering paper, plastic films, and metal foils to various substrates.
Amorphous polyolefin hot melts are commonly used in the non-woven industry for the production of items such as diapers, feminine hygiene products, and medical gowns.
Due to their resistance to moisture, chemicals, and their ability to bond difficult-to-adhere plastics like polyolefin housings and parts, polyolefin adhesives find various applications in the automotive and appliance assembly industries.
Polyolefin adhesives, such as Bostik PO60, are used in the footwear and apparel industries for bonding temperature-sensitive substrates and providing a soft, flexible bond.
Certain polyolefin adhesives, such as Master Bond X21Med, are specially formulated for use in medical devices and pass ISO 10993-5 standards.
When selecting a polyolefin adhesive for a specific application, it is essential to consider factors such as:
• Bond strength and impact resistance
• Resistance to solvents, chemicals, and environmental conditions
• Temperature sensitivity of the substrates
• Open time and set time
• Compatibility with the substrates being bonded
• Ease of application and required equipment Popular Brands and Products
Conclusion
Polyolefin adhesives are a versatile and effective solution for bonding polyolefins to various substrates in a wide range of industries and applications. By understanding the different types of adhesives available, their properties, and the factors to consider when choosing an adhesive, you can ensure the success of your project and the longevity of the bond.
Polyolefin adhesives with the trade name BehBond create polymer products, as they have active agents and chemical bonds with the ability to connect polar and non-polar materials, improved adhesion and mechanical properties. Interlayer adhesives are used in polymer/metal multilayer pipes for improvement of adhesion and properties of PEX and PERT pipes as well as oil and gas transfer pipes. Contact Us For More Information.