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Boron-free Coolants


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We have been working on formaldehyde-free water-mix cutting fluids because of the potential for formaldehyde release biocides to become un-useable in the near future, and also that there is already sufficient evidence to classify formaldehyde as a category 2 mutagen and a known animal carcinogen.

Removing formaldehyde release biocides from water-mix metal working fluids without the loss of longevity and at a low cost is difficult. We already have some technology in use in synthetics and high oil products.

Traditional low cost semi-synthetic cutting fluids have been based on boric acid - amine salts / amides combined with formaldehyde release biocides. These can give excellent sump-life, corrosion protection and cleanliness.

 To match the low cost and performance of these boron bio-stables is difficult.

The common approach has been to use different types of amines to give bio-stability and corrosion inhibition.

DCHA (dicyclohexylamine) has been used as it gives good bio-stability when used in the emulsion at 3500ppm. It is not perfect as in some systems the amine is not resistant to the in-house bacteria population. It is also secondary.

Synergex / Advantex ex Taminco is used extensively in USA. It is as effective as DCHA in our lab tests, but it is a secondary amine and so will not have broad acceptability. It does offer a potentially cost effective approach to replacing formaldehyde release biocides in boron based cutting fluids. We have tests ongoing.

Synergex T ex Taminco is a tertiary amine as an alternative to Synergex/Advantex. It does not have as good bio-stability as the Synergex. We have used it when combined with other non-formaldehyde release biocides. When combined with other biocides it can be very effective.

Genamin CH 020 is a tertiary amine with potential interest as a bio-stable amine. Our test work indicates it is not useful on it’s own, however in combination with biocides it may be useful.

 There is a possible approach to replace formaldehyde release biocides combining bio-stable amines with non-formaldehyde biocides.

MIT (methylisothiazolinone) and BIT (benzylisothiazolinone) in combination can be used at a level below the sensitising labelling requirement of the concentrate. However BIT is known to have stability issues in the presence of amines.

MIT could be used alone with amines, but the spectrum of performance may not be sufficient. Tests are ongoing.

So after a lot of development work we have developed a couple of products which are based on new technology.

Coolant DYOP-20

Coolant DYOP-45

These products are free of formaldehyde and free of isothiazolinones but give long term stability.