ECA-based CAs with the low-blooming characteristics of MECA-based ones.
Superglue can have a distinct smell. When working with traditional CAs, it is important to work in a well-ventilated area and with the correct protective equipment. A suitable dispensing methodology can reduce the need for handling and improve health and safety. However, low bloom formulations are also
low odour. Born2Bond Ultra, for example has inherently low volatility, which means less odour, less irritation and no CLP hazard symbols on the label.
There is no requirement to apply a CA directly from the tube or bottle. Depending on the level of accuracy and repeatability required, as well as the throughput of the application, CAs can be dispensed as part of a manual, semi-automated or fully automated process. You can, for example, combine a pressure
pot or reservoir with a suitable diaphragm dispensing valve for a semi-automated, precise dispensing technique. Mounting this equipment onto a robot to automate fully will result in a methodology that requires very little operator intervention. The trick to establishing a successful
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dispensing methodology is finding an adhesives supplier that is also experienced with the relevant dispensing and automation equipment.
Most cyanoacrylate adhesives are inherently of a low, runny viscosity, which means they don’t work well when there are gaps to be filled, if the parts are porous, or if the bondline orientation means that the adhesive would drip or run out. However, CAs are now available in a range of
different viscosities for gap filling. Born2Bond Repair, Structural, Flex and Ultra all offer high-viscosity formulations for gap filling. The high viscosity ADH9454 CA gel, for example, prevents running on inclined or vertical surfaces during its 3 to 60 second fixture time, enables gap filling up to 0.5 mm, and minimises the absorption of adhesive into porous substrates to ensure a good bond.
This is generally true, and in the past this has limited their use in many industrial applications. But, CAs have better resistance to non-polar solvents like IPA. It doesn’t seem logical, but cyanoacrylate adhesives have more chemical resistance to petrol than they do to water. Advances like the hybrid chemistry of Born2Bond Structural now give superior moisture resistance, showing a very small reduction in adhesive strength after 1000
hours immersion in water, and much improved compatibility with polar solvents.
To date, CA bond strength has been readily compromised by temperature and moisture/humidity, which has limited their use for load-bearing applications. However, Born2Bond Structural has very high impact resistance (27 KJ/m2
steel after 24h), and
toughness. It develops structural bonding performance to steel, ABS, PVC, phenolic and polycarbonate, amongst other substrates, and features particularly good adhesion to aluminium (lap shear strength 12 MPa). With higher temperature, moisture and solvent resistance, it is a good candidate to test for a structural industrial application.
More people than would care to admit have accidentally stuck their fingers together with superglue. Luckily, soaking your hands in soap and warm water will loosen the cyanoacrylate enough for you to slowly peel your fingers apart. If not, an acetone-based nail varnish remover should finish the job.
• Cure in seconds
• Quality assurance features including Encompass™ for visible cure and placement veri cation
• A wide range to choose from; nd the most suitable for your substrates and application
info@intertronics.co.uk intertronics.co.uk
FEBRUARY 2023 DESIGN SOLUTIONS 19
• Technology from a global leader in UV curing materials and systems
In addition to materials, we offer matched application and curing equipment for a complete process.
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