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Wednesday, 18 September 2019
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Raw materials & technologies, Technologies

Coatings additives: New chemistry for reactive emulsifiers

Thursday, 28 August 2014

The conversion of alkyds to waterborne form has a number of problems. Very high viscosities may occur during the invert emulsion process, while the surfactants used may impair the properties of the dried film. A new emulsifier that crosslinks during drying can improve final properties, while allowing emulsification to be completed before the solvent is stripped from the original alkyd.

Source: kanvag-Fotolia.com

Source: kanvag-Fotolia.com

In his article in the current issue of European Coatings JOURNAL Charles F. Palmer, Jr. from Ethox Chemials presents new reactive emulisfiers for waterborne alkyd systems. Here the results at a glance:

Alkyd resins continue to be used in large volumes in solventborne coatings. However, the conversion of alkyds to waterborne form has a number of problems. 

Waterborne alkyds may be prepared either by grafting onto an emulsion polymer or directly by the invert emulsion process. The latter is more flexible, but the surfactants used lead to very high viscosities during production and may impair the physical properties of the dried film.

A new type of emulsifier based on the styrenated phenol hydrophobe and containing allyl groups crosslinks during drying, thus improving final properties. It also allows emulsification to take place before the solvent is stripped from the original alkyd, reducing viscosity problems.

The reactive emulsifier produced a more hydrophobic film which resisted water penetration better than a standard waterborne alkyd. Gloss and adhesion to metal also showed some improvement

You will find the complete article in the September issue of European Coatings JOURNAL 2014 at page 22.

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