New Metal Carboxylate Technology for the Oxidative · PDF fileMetal Organic Solutions ... New Metal Carboxylate Technology for the Oxidative Drying of Alkyd Based Water and Solvent

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New Metal Carboxylate Technology for the Oxidative Drying of Alkyd Based Water and Solvent Borne Coatings

Dr. Andrew Mason European Coatings Show Nürnberg, March 2013

Overview

Why develop this technology Cobalt legislation – toxicology

New technology The products

For water and solvent borne coatings Combining with other driers Results

Future Summary and conclusions

Cobalt Legislation - Toxicology The members of the Cobalt REACh Consortium

(CoRC) agreed to the self-classification of the following cobalt substances: Cobalt, Cobalt propionate, Cobalt bis-2-ethylhexanoate, Cobalt borate neodecanoate and Cobalt (II) 4-oxopent-2-en-2-olate. as Repro Tox Cat. 2 (H361) (CLP).

This change in classification resulted in the addition of the H361 risk phrase and new pictogram on the material safety data sheets (MSDS) and labels for those products containing ≥ 3% of these substances.

Phrase and Pictogram

“Suspected of damaging fertility or the unborn child”

CoRC Update

The Cobalt REACh Consortium met recently and it was agreed that Cobalt Neodecanoate and Cobalt Naphthenate will also be reclassified as Repro Tox Cat. 2 (H361) (CLP).

Further details will follow shortly.

Cobalt Alternatives

DURA Chemicals has worked continuously over the past years in the pursuit of effective alternatives to cobalt carboxylates.

The result of this has been a number of effective proprietary products that are currently used in the marketplace.

As a company looking at continuous development we have not rested on our laurels. This forward thinking drive and determination has resulted in the latest series of the most effective new products –

DriCAT® 2700F series

New Technology

The DriCAT® 2700F series of products is based on highly efficient free radical technology for the oxidative drying of water and solvent, alkyd formulated, coatings.

Superior Performance

When DriCAT® 2700F series are balanced with the other driers an improved control of the drying process gives coatings with: Longer wet edge Exceptional whiteness Superior long term colour retention Improved loss of dry Better gloss control Better hardness development Better durability

For Solvent Borne Coatings

DC2700F – Manganese based DC2710F – Iron based DC2720F – Manganese/Iron blend

Combine with

Duroct® Calcium range and Duroct® Zirconium or Strontium or

Cerium ranges

For Water Borne Coatings

DC2705FW – Manganese based DC2715FW – Iron based DC2725FW – Manganese/Iron blend

Combine with

Duroct® Lithium 2% NDA and Duroct® Zirconium WR range

Products in the Market

DriCAT® 2700F - developed for solvent borne and the first to be sold in commercial volumes

DriCAT® 2705FW - developed for water borne and fully commercialised

DriCAT® 2710F, 2715FW, 2720F and 2725FW - recent developments that offer alternative drying/cure profiles

Manganese or Iron

In comparison against cobalt Manganese based products generally give

a slightly slower touch dry but a faster through and hard dry.

Iron based products generally give a faster touch dry and slower through and hard dry.

The manganese / iron blends are designed to balance the best of both metals.

Which product for which coating?

Drying Comparisons

In the following examples the Cobalt drier was replaced with DriCAT® 2700F series according to the guidelines we recommend for initial evaluations.

No optimisation of the drier blends was used.

Solvent Borne

Duroct® Calcium 10 and Zirconium 24 as co-driers, no optimisation

Solvent Borne - Discussion

Manganese is the slowest in the early stages of drying but gives a faster through and hard dry

Iron is very quick initially but with a very noticeably longer through and hard dry. The result of this is seen in the dried film which is less white, more yellow and softer due to lower crosslink density.

The blend is an improved balance. Further improvements would be made by

optimising the Calcium and Zirconium levels.

Water Borne

Duroct® Lithium 2 NDA and Zirconium WR 12 as co-driers, no optimisation

Water Borne - Discussion

The slower early stages of Manganese gives a longer wet edge, but the faster through and hard dry gives a better overall drying.

Iron is too quick initially and gives a soft film that is difficult to work with.

The blend is an improved balance. Further improvements would be made by

optimising the Lithium and Zirconium levels.

A benefit may also be possible by reducing the Iron loading.

Maximising Performance

Achieving maximum performance is about finding the correct balance of DriCAT® 2700F series with the co-driers and anti-skinning agents.

BALANCE IS THE KEY

DriCAT® 2700F series for Solvent Borne

DriCAT® 2700F series combined with Duroct® Calcium and Zirconium /

Cerium / Strontium driers. Vary the drier loadings according to oil

length, oil type, application area and required performance.

Works with MEKO and MEKO alternatives

DriCAT® 2705FW series for Water Borne

DriCAT® 2705FW series are designed for water miscibility Duroct® Lithium 2 NDA and

Zirconium WR 12 are used to provide good through and hard dry.

Calcium driers are not recommended because Calcium driers can precipitate, flocculate and cause gelation due to incompatibility.

Adjustments to Drier Addition Rates

The addition rates of the driers are adjusted to maximise the performance.

For both solvent and water borne the same basic principle are followed: First adjust the Auxiliary Drier loading Then adjust the Through Drier loading Lastly adjust the Primary Drier loading

More detailed guidance is available

Superior Initial and Long Term Colour Performance

Compared to cobalt and other cobalt alternatives in the market the use of DriCAT® 2700F series gives a visible improvement in the initial and long term colour performance of coatings, especially the dark yellowing of whites.

Comparative Tests

Commercially available white satin deco paints. One paint uses DriCAT® 2700F as the primary drier and this is compared directly against a Cobalt dried paint.

Whiteness

Yellowing

Discussion

DriCAT® 2700F dried paint has a higher crosslink density, the result of which is improved yellowing and maintenance of whiteness.

Improved Loss of Dry - Pigments Loss of dry due to strongly

absorbing pigments such as Carbon black is improved

Loss of Dry - Water

Products are not hydrolysed by water, giving longer in can stability

Summary

DriCAT® 2700F series are a range of commercial and newly developed products.

Based on new technology but working in the traditional way.

Low metal – high activity products. Balance the co-driers and anti-

skinning agents to maximise the performance. Guidelines available

Summary – Superior Performance

Longer wet edge Exceptional whiteness Superior long term colour

retention Improved loss of dry Better gloss control Better hardness development Better durability

Future Developments Extend the technology to different metals

Bismuth and Mercury – to be taken to Pilot Scale Copper Cobalt Platinum Nickel Vanadium Tin Zinc Cerium Neodymium

Products with increased activity Products for different market applications

Contacts

For further technical advise and guidance please contact: Dr. Andrew Mason +44(0)7824631390 [email protected] Jon Graves +15109182940 [email protected]