Driers

   Driers are one of the main components of paintwork materials which harden by a mechanism of oxidative polymerization; they have effect on virtually all basic properties of coatings.  Adequate choice of the type and quantity of the drier determines drying rate, hardness and elasticity of the film, impact strength and, to a large degree, protective properties.

   By mechanism of action driers are divided into two classes:  primary or true driers and auxiliary driers (promoters) which activate primary driers. Promoters facilitate uniform drying throughout thickness and improve stability of true driers. True dryers are carboxylic acid salts of transition metals such as: cobalt, manganese, lead which exist in divalent state. Promoters are calcium, barium, zinc, and zirconium salts. Promoters, being strong bases, more actively interact with carboxyl groups of alkyd oligoesters excluding their interaction with metal salts contained in the driers. However, there is an opinion that Ca2+ ions decrease activation energy  of hydroperoxide decomposition, i.e. both type salts greatly influence end-use properties of  mixed driers.

   Currently driers are represented in a wide range, however 2-ethylhexanecarboxylic acid  (2-EHC)– based products become the most widely used. This acid has a number of advantages over synthetic fatty acids, naphthenic acids, tall oil fatty acids and other carboxylic acids traditionally used for drier synthesis. One of the main advantages is composition stability (basic component content of the technical acid is min. 99, 5%); color in Hazen units is max. 15 which makes it possible to produce concentrated driers of stable composition and low color index.  The latter factor is especially important for light tone paintwork materials as even insignificant quantity of 64P type fused drier greatly reduces whiteness of the film.  

    “Khimpostavschik” was the first in Ukraine to start production of  2-EHC – based light driers. We produce 2-ethylhexanoates of mono-metals - Со, Mn, Zn, Ca, Ba, Li, Zr, Cu, Pb- as solutions in organic solvents.

   In some cases use of naphthenate driers based on distilled naphthenic acids is quite justified as a cheaper alternative to octoate driers. Naphthenate driers are produced in accordance with GOST 1003-73 “Naphthenate liquid driers”.

Driers

• Octoate driers
  
• For drying oils and oil-base paints
• For oxidation process
• For alkyd varnishes and enamels
• Naphthenate driers
• NF-1 naphthenate drier