Liquid acrylic adhesives are commonly applied with a damp brush or cloth and are used for upholstery or woodworking applications. Liquid acrylic adhesives are more flexible and thinner, so projects that require a perfect appearance are best done with a liquid adhesive. Paste: Acrylic adhesives in paste form are the most common and can be removed from a tube or applied to the material with a brush that is often provided.
Acrylic adhesivepastes can be used for virtually any type of application, but are most commonly used for wood, glass, metal and waterproof items.
Acrylic adhesive pastes can also be used in conjunction with liquid acrylic adhesives and are usually used to “sandwich” two objects together for permanent bonding. Acrylic adhesives, as defined in this text, are based on acrylate and methacrylate monomers and have been used commercially for over 50 years. These products are supplied as two separate components that can be mixed prior to application or each component can be applied to separate surfaces. Traditionally, methacrylates are preferred over acrylates mainly because of the odor of acrylates.
The most popular and commercially successful structural acrylic adhesives used today are polymerizable mixtures of polymers dispersed or dissolved in methyl methacrylate (MMA) monomer. These adhesive products are supplied as two separate components that are mainly mixed just prior to application. One component contains a peroxide compound (oxidizing agent) and the second component contains an amine or metal salt (reducing agent) that reacts with the peroxide component upon mixing to initiate free radical polymerization of the methyl methacrylate monomer. This chapter will review the historical evolution and curing systems of methacrylate adhesive systems.
In addition, it will review first- and second-generation products and advanced technology, as well as formulation variables, bondline properties and applications of methacrylate-based adhesive systems. The construction industry often opts for acrylic adhesives as the joining method of choice due to their high performance and durability. Liquid acrylic adhesives can be applied directly to an object and are often used in upholstery, decoration and woodworking. Acrylic adhesives have been widely used in this industry due to their durability, high cohesive strength and strong build-up of interfacial adhesion against paint substrates.
Acrylic copolymers of vinyl acetate are used in adhesive formulations and are claimed to have excellent strength. For industrial bonding applications, structural acrylic adhesives are generally subclassified by application. Deck-to-hull joints of 29-foot boats are held together with a combination of acrylic adhesive and mechanical fasteners. The weather resistance and anti-corrosion properties of acrylic adhesives also allow them to be used to create signs designed for outdoor display purposes.
Temporary acrylic adhesives are manufactured with low cohesion, adhesion and viscosity and can usually be broken with water or low-quality adhesive removers without damaging the material to which they are applied. Acrylic adhesives play a crucial role in the manufacture of electric motors, as they provide an effective method for joining magnets, shafts, housings and rotors together. In addition, no additional finishing work is required when using acrylic adhesives, which means faster response and polished aesthetics. Foam backings coated with acrylic adhesive, such as those made of neoprene, polyethylene, polyurethane and acrylic polymers, are very popular for this type of application.
Acrylic adhesives are part of the structural adhesive family, making them an excellent multi-purpose and versatile bonding option. Acrylic adhesives have excellent environmental resistance properties, which means they can withstand solvents, moisture, salt spray, oils and weathering. In the pressure-sensitive sector, acrylic adhesives can be formulated to provide removable or permanent properties. .