Driers

INTROUCTION

Driers are added to coatings, (paints, varnishes and inks) to speedup the physical change from the liquid to the solid stale. This change is effected by an oxidative crosslinking mechanism accelerated by the metallic cation of the added drier. The acid is present to secure adequate distribution of the metal throughout the medium. There are two main categories of driers, i.e.: Primary/active driers : cabalt, manganese Auxlliary driers : lead, ziroconium, lithium, strontium, calclum, zinc, barium

the auxiliary driers are used in conjunction with active driers to improve the final properties of the coatings. The solubility or solvent of these metallic soaps in a variety of organic solvents accounts for their many and varied other uses, such as catalysts, fungicides, fuel additives, stabilizers and wetting agents.

Our many years experience in the manufacture of driers has lead in recent years to the development of highly concentrated driers and combination driers, and a new generation of driers for water-borne paints. Comprehensive information about these driers together with our regular range is given further on in the brochure. Details are also given about yet another category of driers which are becoming increasingly popular. These are the Lead- or Barium- free driers.

Zirconium

Zirconium is an excellent substitute for lead in Lead-free paints.

It strongly activates the primary driers, Cobalt and Manganese and is particularly recommended for eliminating of certain tall-oil alkyd resins.

Zirconium is also less toxic than lead or Barium.

Lithium

Lithium is a substitute for lead and used in lead-free drier compositions in conjunction with Cobalt and Calcium. They are excellent drying catalysis even in high-solids, however, the whiteness of long-oil alkyd-based paints may be influenced.

Calcium

This is an interesting driers since there are indications that when used in combination with other metal soaps a metal complex is formed. That is to say that if a violet Cobalt solution is added to Calcium then a vivid blue colour appears.

Calcium prevents haze formation in certain alkyd resins that are siccativated with Lead. Excessive dosages however should be avoided in connection with the water sensitivity (outdoor durability) of the paint film.

Zinc

When used in combination with cobalt this type of drier produces a hard film. Zinc keeps the film open thereby allowing oxygen easy access which ensures hardening throughout the paint film.

Of all the driers, zinc is the best wetting agent. The gloss of the film is also often improved and it has an added property of counteracting mildew formation.

A good quality should meet the following requirements:

- Uniform metal content
- Readily liquid for easy workability and dosage
- Constant colour and viscosity
- Readily soluble in all binders
- Good stability
Mobel manufactures the following types of driers:

A. Driers. B. WEB driers C. Special cobalt- free driers D. Drier Promoter Drymax A Short description of dries based on various metals Primary/ active driers- Cobalt This is the most active of the dries. It effects rapid surface drying and is generally used in conjunction with auxiliary dries. An excessive amount of Cobalt however reduces the water resistance of the paint and increases the risk of wrinkling.

Manganese

This is also an active drier though generally less active than Cobalt. As an accelerator of the polymerization in baking finishes, Manganese is usually more effective than Cobalt, Cobalt and Manganese primarily improve the surface drying of the paint film.

However, the relatively dark colour of the Manganese drier may be a disadvantage.

Auxiliary driers – Lead

An entirely different type of drier which is still an important auxiliary drier even through the substitution of Zirconlurn is becoming increasingly popular. Lead is mainly applied in combination with active driers such as Cobalt and Manganese. Due to it's polymerizing effect, Lead ensures a thoroughly hardened film.

MOBEL DRIERS These are metallic salts of naphthenic and/ or synthetic acid blends. They are stable and extremely soluble in all usual vehicles and thinners.

MOBEL DRIERS AND APPLICATION PERCENTAGES

The percentages are calculated as metal on the quantity of the vehicle (solid matter). These percentages are however, very dependant upon the type of vehicle.

Application percentages

Calcium 0.03 - 0.3
Cobalt 0.01 - 0.1
Cerium 0.005 - 0.4
Lead 0.08 - 0.6
Lithium 0.01 - 0.05
Manganese 0.01 - 0.1
Zinc 0.03 - 0.5
Zirconium 0.05 - 0.3
As mentioned earlier, active driers are mostly used in combination with auxiliary. SERVO offers a range of ready-made drier combinations, which are called combi driers.

These driers have amongst others, the following advantages:

• Improved efficiency
• Reduction of the amount of raw materials
• Reduced risk of weighing errors
• Optimal metal proportions
• Simplified production process
• Uniform quality In order to meet individual needs, "custom-tailoring" of combination driers is also offered.
And as you will see, the range also includes a number of Lead- and Barium-free drier combinations.
MOBEX DRIERS

Cobalt 6 %
Appearance : clear blue-violet liquid
Metal content : 6.0 ± 0.2
Color, Gardner, max : -
Viscosity mPa.s, 20 ºc max. * : 100
Density kg / m3, 20 ºc, approx. * : 910
Solid matter, % m * : 42 – 46
Cobalt 10 %
Appearance : clear blue-violet liquid
Metal content : 10.0 ± 0.2
Color, Gardner, max : -
Viscosity mPa.s, 20 ºc max. * : 300
Density kg / m3, 20 ºc, approx. * : 1000
Solid matter, % m * : 69 – 77
MOBEX DRIERS

Cobalt 12 %
Appearance : clear blue-violet liquid
Metal content : 12.0 ± 0.3
Color, Gardner, max : -
Viscosity mPa.s, 20 ºc max. * : 600
Density kg / m3, 20 ºc, approx. * : 1050
Solid matter, % m * : 72 – 80
Lead 36 %
Appearance : clear liquid
Metal content : 36.0 ± 0.4
Color, Gardner, max : 6
Viscosity mPa.s, 20 ºc max. * : 400
Density kg / m3, 20 ºc, approx. * : 1380
Solid matter, % m * : 76 – 84
MOBEX DRIERS

Calcium 5 %
Appearance : clear liquid
Metal content : 5.0 ± 0.2
Color, Gardner, max : 6
Viscosity mPa.s, 20 ºc max. * : 200
Density kg / m3, 20 ºc, approx. * : 920
Solid matter, % m * : 50 – 58
Calcium 10 %
Appearance : clear / slightly hazy liquid
Metal content : 10.0 ± 0.2
Color, Gardner, max : 4
Viscosity mPa.s, 20 ºc max. * : 50
Density kg / m3, 20 ºc, approx. * : 995
Solid matter, % m * : 49 – 55
MOBEX DRIERS
Zirconium 12 %
Appearance : clear liquid
Metal content : 12.0 ± 0.3
Color, Gardner, max : 2
Viscosity mPa.s, 20 ºc max. * : 50
Density kg / m3, 20 ºc, approx. * : 990
Solid matter, % m * : 42 – 48

Zirconium 18 %

Appearance : clear liquid
Metal content : 18.0 ± 0.3
Color, Gardner, max : 3
Viscosity mPa.s, 20 ºc max. * : 200
Density kg / m3, 20 ºc, approx. * : 1140
Solid matter, % m * : 64 – 72
MOBEX DRIERS

Zinc 8 %
Appearance : clear liquid
Metal content : 8.0 ± 0.2
Color, Gardner, max : 8
Viscosity mPa.s, 20 ºc max. * : 50
Density kg / m3, 20 ºc, approx. * : 910
Solid matter, % m * : 46 – 52
Zinc 12 %

Appearance : clear liquid
Metal content : 12.0 ± 0.3
Color, Gardner, max : 8
Viscosity mPa.s, 20 ºc max. * : 200
Density kg / m3, 20 ºc, approx. * : 990
Solid matter, % m * : 64 – 72
Mobel D 54
Mobel D 55
Pigment Dispersing Agent
General Information

Mobel D 54 and Mobel D 55 are low foaming polymeric pigment dispersing agents that work effectively for many hydrophilic pigments and extenders, used in aqueous coating .Both products contain the same active ingredients and differ only in concentration.
Mobel D 54 contains 30% Mobel D 55 contains 50 % active matter.
Physical Properties
Mobel D 54
Appearance : clear liquid
Active matter : 30%
PH : 7.0-9.0
Density, 20º C
(DIN 53217/3) : 1130 kg/m3
Viscosity ,25 ºC
(DIN 53015) : max. 40mPa.s
Colour

(DIN 53995) : max.3Gardner
Solubility : soluble in water
Flash point : >100 C
Composition : ammonium salt of polymeric carboxylic acid
Mobel D 55
Appearance : clear liquid
Active matter : 50%
PH : 7.0 – 8.5
Density, 20º C : approx. 1220 kg/m3
Viscosity ,25 ºC
(DIN 53015) : max. 1000mPa.s
Colour
(DIN 53995) : max. 4 Gardner
Solubility : soluble n water
Flash point : : > 100C
Composition : ammonium salt of a polymeric carboxylic acid
Application And Properties

Mobel D 55 and D 54 are applicable to practically all types of aqueous coatings based on polymeric binders, e.g. PVAC, PAC-, PSB-,PSAC dispersions, terpolymers and lattices etc.

They also show excellent compatibility with those polymeric binders commonly used in aqueous formulations, e.g. paper coatings, adhesives, carpet blacking and plastics etc.

Mobel D 55 and D 54 are applied as dispersing agents in many hydrophilic pigments and extenders in queous mediums such as titanium dioxides, calcium carbonate, barium sulphate, iron oxides etc. The products are strongly adsorbed onto these pigments and extenders and reduce the viscosity of the milling paste. If strongly hydrophobic pigments are used such as agent, e.g. Mobel 1566 or Mobel265 .

Mobel D 55 and D 54 counteract flocculation, floating, flooding and pigment settling . They do not cause foam formation , not do they depolymerise upon storage. As a result coatings with improved performance and excellent stability are contained .
Mobel D55 and D 54 also avoid the viscosity increase which usually occurs during storage with coatings formulated with less chemically stable dispersing agents such as most polyphosphates and various copolymeric dispersing agents.