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A User’s Guide to Methacrylate Adhesives

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Parson Adhesives
A User’s Guide to Methacrylate Adhesives

When you need to join two structures together to bear a load, most people imagine a nut and bolt job. You’ll be surprised at just how effective some structural adhesives can be. They give you the strength and flexibility in the joint without the weight of those extra metal pieces. Methyl methacrylate adhesives (MMAs) are designed to bond plastics, metals and even composite materials. That’s why they have found a variety of uses in marine, transportation and construction & building industries.

What is methyl methacrylate adhesive?

Methacrylate Adhesives can be described as acrylic adhesives made of a hardener and a resin. They have a quick curing ability and offers full strength within no time. The bond can easily resist peeling, shearing and impact stress, allowing it to be strong yet flexible. It has the unique capability of forming bonds between materials of different strengths and flexibilities, for example, metal and plastic. Methacrylate adhesives need no heat for curing the bond, and are available in a wide range of curing times.

Uses of Methacrylate adhesives

Automotive, aerospace, transport, composites and marine industries all widely use methacrylate adhesives. With fast curing times, it is popular in production lines. Metals like stainless steel, steel and aluminum, thermoplastics like PVC and acrylics and composites like carbon fiber and fiberglass, unsaturated polyester and gel-coat among others, commonly use methacrylate adhesives. Some specific uses of these adhesives can be seen in the roof panels and door panels of trucks and some construction equipment, bonding magnets into aluminum or steel housings and widely in bonding hulls, yachts, ski boats, kayaks and deck liners.

Benefits of methacrylate adhesives

Methyl methacrylate adhesives are a great replacement to welding joints and bolts and screws. Mechanical fasteners (like bolts, screws, nuts) need more labor and time, and are also subject to loosen and corrode over time. Welded joints are also labor-intensive and expensive. MMAs offer resistance to chemicals and environment and can cure quickly.

They are even superior to most alternate adhesives. Epoxy adhesives aren’t great with dissimilar metals since they are brittle and cause the bond to crack. Polyurethane adhesives need intense surface preparation which probably includes priming it to. Being less brittle than epoxies, MMAs work better to fill big gaps. They don’t require much surface preparation, a simple wipe-down of the plastic or metal with solvent would usually suffice.

MMAs processing conditions are quite noteworthy. Even if the resin and the hardener are applied separately to each of the parts to be joined, the cure begins only once those two joints are put together. This also implies that a good MMA bond doesn’t depend on a precise mixing ratio. Also, MMAs have an intense smell and are flammable, so you might want to make sure there are ample ventilation and safety precautions while using them.

With such fantastic variety in viscosity, cure times and pot life, manufacturers can choose the kind of methacrylate adhesive that best meets their requirement. It’ll be quite the challenge to find another adhesive that offers this combination of ease of use, superior mechanical strength and convenience for bonding metals, composites and engineered plastics.

Author’s Bio: Kalpesh Mehta is an avid traveler who saw methacrylate adhesive being used to fix the broken door panel of her car and is certain that that door is now as good as new!

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