Dispersants

CO-4 octoate drier (calcium octoate)

(TU U 24.4-13395997-021:2008)

    For improvement of   pigment wetting and dispersion we offer CO-4 calcium octoate (Ca2+=4%): presence of calcium octoate at dispersion stage allows to reduce process time and decrease adsorption on pigment particles of active driers (cobalt, manganese) which leads to their activity loss. Calcium octoate acts first as a dispersant, secondly as a substance deactivating pigment surface by adsorption, and thirdly, as a substance producing synergistic effect in combination with basic drier (reduction of hydroperoxide decomposition activation energy).

Specifications

   Besides calcium octoate, zinc and barium octoates can be used as dispersants.

   It follows from the data obtained that all tested driers have positive effect on dispersion rate, however the best dispersing properties are exhibited by calcium 2-ethylhexanoate (CO-4).

   Comparative tests for dispersion time carried out in bead mill in production of PF-115 enamel without using a dispersant and with calcium octoate and soya lecithin as dispersants had the following results:

   dispersion of pigments in the initial period (15-20 minutes) proceeds essentially in the same way for all systems and depends, from our point of view, on dispersing equipment, and then the role of  surfactants is observed;

   with calcium octoate pigment paste has dispersion degree of 25 mm in 30 minutes from the start of dispersion, and with lecithin – in 40-50 minutes. Without a dispersant it took suspension 65-70 minutes to achieve dispersion degree of 25 mm;

   use of calcium octoate in quantity of 0,5-0,6 parts by weight per 100 parts by weight of enamel makes it possible to reduce dispersion time by 30-50%;

    synergistic effect of calcium octoate and the basic drier  is evidenced by  reduced drying time to degree 3 and increased  coating hardness of enamel samples produced using calcium octoate at dispersion stage; 

   calcium octoate possesses anti-sedimentation properties.

Octoate drier CO-4M, grade A

(modified calcium octoate)

(TU U 24.4-13395997-021:2008)

   Modified CO-4M calcium octoate was developed to improve pigment wetting and dispersion, to increase sedimentation resistance of pigment suspensions and to decrease flotation of light organic pigments. Metal content of this dispersant is similar to that of CO-4, hence consumption of CO-4M is 0,5-0,6 parts by weight per 100 parts by weight of enamel.

   For production of nitrocellulose-, alkyd-urethane -, epoxy-urethane-, perchlorvinyl – , etc. paintwork materials we offer commercial dispersants in toluene.

NF-6 calcium naphthenate

(GOST 1003-73)

   For improvement of   pigment wetting and dispersion we offer NF-6 calcium naphthenate (GOST 1003-73) instead of CO-4 calcium octoate. Presence of calcium naphthenate at dispersion stage allows to reduce process time and decrease adsorption on pigment particles of active driers (cobalt, manganese) which leads to their activity loss. Calcium naphthenate acts first as a dispersant, secondly as a substance deactivating pigment surface by adsorption, and thirdly, as a substance producing synergistic effect in combination with basic drier (reduction of hydroperoxide decomposition activation energy) which allows to reduce basic drier consumption  by 20-25%.

   Our laboratory carried out a research regarding possibility of CO-4 calcium octoate replacement with NF-6 calcium naphthenate. At the same concentrations of Ca2+  dispersing ability of naphthenate is slightly lower than that of the octoate, but due to higher concentration of Ca2+ in NF-6 they can be replaceable without change in consumption rate.

    To carry out tests for dispersing ability in a lab bead mill there were prepared samples of PF-115 enamels using 0,5 parts by weight of CO-4, NF-6 per 100 parts by weight of enamel and samples without a dispersant. To estimate possibility of reduction of basic drier consumption in case of using NF-6 as a dispersant we introduced driers into the enamels in various quantities and recorded drying time and coating hardness. Degree of enamel grinding was determined in accordance with GOST 6589-74 using “Klin” grindometer. Time and coating drying degree were determined in accordance with GOST 19007-73.  Coating hardness was determined in accordance with GOST 5233-89 using TML 2124 hardness pendulum tester (pendulum A). Coating thickness was determined using PosiTestor100B digital thickness meter.  Tests were carried at 20°С (heat chamber) and relative humidity 70-72%.

Specifications

COMPARATIVE TESTS OF CALCIUM OCTOATE AND CALCIUM NAPHTHENATE

а) dispersion activity

б) drier consumption

   As can be seen from the above, replacement of CO-4 calcium octoate in your formulations of paintwork materials with NF-6 calcium naphthenate will allow to reduce costs for purchasing additives without impairing drying time and coating hardness.

Safety measures:

   Keep away from fire.

   Store in tightly closed packaging.

Packing

   40 kg, 150 kg, by tank truck