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Finished Adhesives and SealantsRaw Materials and ChemicalsFormulatorsManufacturers

Ask Dr. Dave: March 2013

Can you offer some advice regarding the sourcing of monomers for acrylic adhesives formulations?

By Dave Dunn Ph.D.
ask dr dave dunn
March 1, 2013

QUESTION: We are formulating acrylic adhesives (both reactive acrylics and anaerobics), but are having problems with the sourcing of monomers. Some suppliers can’t seem to give us monomers that produce shelf-stable products, even though they purport to have added extra free-radical stabilizers. Can you offer some advice?

ANSWER: These types of adhesives can be quite complicated to formulate. Without knowing the specifics of your formulation, I can only suggest the following: in addition to the polymerizable monomers and other additives, two major factors influence the reactivity of these adhesives: initiators/accelerators and stabilizers.

Initiators and accelerators are usually hydroperoxides and aromatic amines. When the applied adhesives come in contact with metallic surfaces like iron or copper, these initiation systems generate free radicals, which polymerize the monomers to give cured products. Stabilizers, on the other hand, come in two types. The first type of stabilizer, atmospheric oxygen, is a strong free-radical stabilizer. As a result, these adhesives are often packaged in thin containers made of low-density polyethylene that allow the air to permeate the package.

Secondly, extra stabilizers such as quinones are added to give additional shelf stability. In your case, it seems that the extra stabilizers are not giving the desired stability. I would suggest that you look at the strong possibility that the monomers contain traces of iron or copper, perhaps residues from your supplier’s manufacturing equipment. Traces of these metals are the real enemy of the anaerobic adhesives formulator, and you should ask your suppliers to remove them or complex them with a metal chelator. You can also add a metal chelator to your formulation, but be careful about not adding too much and affecting your cure speed. 


Any views or opinions expressed in this column are those of the author and do not represent those of Adhesives & Sealants Industry, its staff, Editorial Advisory Board or BNP Media.

KEYWORDS: acrylics additives monomers

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Dave dunn

Ask Dr. Dave is written by Dave Dunn, Ph.D., of F.L.D. Enterprises, a technical consultancy and full-service industrial market-research firm specializing in the adhesives, sealants, specialty rubbers and plastics fields. Dave is a former vice president and director of Loctite Corp. and has spent many years in troubleshooting adhesive and sealant problems. Questions for publication should be directed to him at 242 Trails End, Aurora OH 44202; phone (440) 477-5164; fax (330) 247-1690; or email DrDave242@windstream.net .

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