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CNSL Derivatives Provide Excellent Adhesion to Non-metal Substrates: Reveals Cardolite’s Study

Published on 2016-07-08. Author : SpecialChem

For many years, Cardolite CNSL derivatives have been formulated in metal bonding adhesives and recently, these derivatives have also demonstrated excellent performance on non-metal substrates. In its evaluations, epoxy and polyurethane adhesives based on Cardolite’s epoxy curing agents and polyols respectively, showed high lap shear strength on plastics and composite substrates, extending the use of these product families to new applications. The study included commonly used plastics like ABS, polycarbonate, PVC, Nylon, Acrylic, polyethylene, and polypropylene, and high strength composites based on carbon fiber reinforced epoxy substrate.

CNSL Derivatives Provide Excellent Adhesion to Non-metal Substrates
CNSL Derivatives Provide Excellent Adhesion to Non-metal Substrates

Trends to move away from steel as a structural material due to weight and corrosion concerns in industries such as automotive and aerospace, have presented an opportunity for adhesive formulators to replace mechanical fasteners and adhere to new materials of construction. However, these opportunities come with a set of challenges since lighter parts are often made from a variety of plastics and composites with lower surface energy than traditional metals, which might require extra preparation steps to ensure good bonding. The unique properties provided by CNSL technology such as good wetting properties and high mechanical strength can be a useful tool to overcome some of these challenges as indicated by the results of its study.

Epoxy and polyurethane adhesives are two technologies frequently selected for bonding non-metal surfaces.

Epoxy adhesives deliver high modulus, thermal resistance, and chemical resistance. Polyurethane adhesives offer good toughness and flexibility even at low temperatures. 

Epoxy systems based on Cardolite’s curing agents (phenalkamines and phenalkamides) and polyurethanes systems based on Cardolite’s polyols provided high bond strength to plastic and composite materials with mostly cohesive or substrate failures after minimum substrate preparation. In addition, these products are easy to handle due to low viscosity and absence of solvent and bad labeling materials. The use of these CNSL derivatives also leads to faster cure of the matrix, which can increase productivity or lower energy costs at the assembly line. Lastly, the hydrophobicity and aromaticity inherited from CNSL, result in excellent water, moisture and chemical resistance for long-lasting bonds.

About Cardolite


Cardolite Corporation is a privately held manufacturer of the world’s largest variety of products derived from CNSL. The unique properties of CNSL are used to develop and produce a wide range of products to service the coating, friction material, adhesive, and composite markets. With over 30 years of experience, Cardolite is the leader in the specialized production of quality CNSL based materials. The company’s customer base includes all types of companies ranging from large Fortune 500 corporations to small specialty manufacturers. With sales offices, representatives, and distribution facilities in the Americas, Europe, and Asia, Cardolite prides itself on delivering high quality products and services across the globe. Cardolite manufactures all products at production plants in Newark, New Jersey (USA), Mangalore, Karnataka (India) and Zhuhai, Guangdong (China).

Source: Cardolite

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