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NewsServVOL 28 • MARCH 2008

The COATINGS FOR AFRICA Symposium and Exhibition has grown from strength to strength ever since it was fi rst held at the Champagne Sports Resort in the Drakensberg. Held every two years, it has grown from 260 delegates in 2004 to 330 delegates in 2006. An even higher attendance is expected on 19 - 21 August 2008 and registration is now open.

This is the only event that brings the South Africa coatings industry and its suppliers together in a combined symposium and exhibition. It is organised jointly by the two industry bodies, OCCA and SAPMA (Oil and Colour Chemists’ Association and SA Paint Manufacturers’ Association). Speakers of international standing and reputation help to draw the decision-makers in the paint, ink and adhesive industries together at this scenic venue.

This encourages attendance by the exhibitors, who were very satisfi ed with

the 2006 event. One of the important reasons for the success of the Exhibition is the fact that it is set up in such a way that delegates need to walk through the Exhibition to have teas and lunches, giving exhibitors maximum exposure. Diederik Viljoen of Protea Speciality Chemicals commented: “We were very pleased by the response to our stand at Coatings for Africa 2006 and will defi nitely book space for this year’s event. It is a great opportunity to meet new and existing customers in an informal setting. Great to spend time with them on the golf course too”

A golf tournament is arranged for the day prior to the symposium at the Champagne Sports Resort’s highly acclaimed golf course. The quality of the course together with its the majestic backdrop of the Drakensberg ensure a fully-booked fi eld and many attractive prizes are up for grabs. There are many sponsorship opportunities available for

sponsoring companies to consider, both at the golf and at the Symposium itself.

The theme for the Symposium will be “PROFITABLE SOLUTIONS FOR TOMORROW’S WORLD". Papers to be presented will provide delegates with information and opportunities that could lead to increased profi tability and will address the challenges facing the coatings industry in the near future. Papers have been invited which deal with any aspect of Surface Coatings and Inks such as raw materials, manufacture, formulation, testing, quality control, application, colour, corrosion, environment, education and training.

For more information or to register visit www.coatingsforafrica.org.za or contact Rosalie Howard on rosalie@coa.co.za or +27 861 262 262

Submitted by: Jenny Jay, OCCA Cape Section, tel: 021-785 2081, email: jenny@kaolin.co.za

COATINGS FOR AFRICAto be held in the Drakensberg again

Rohm and Haas has created an effective global programme for evaluating the exterior durability of its global speciality materials, to ensure optimum quality standards.

With over 30 exposure stations throughout the world – in countries including the USA, Singapore, Australia, Japan, China, Sweden and France, the company is able to subject its products to a wide variety of exposure conditions.

The data obtained from these diverse exposure sites enables the company to provide comprehensive exterior performance profi les on Rohm and Haas products and other paint components, as well as paint formulations.

“Rohm and Haas South Africa keeps abreast with the latest international trends and brings leading edge technologies to the local market. The company has an ongoing commitment to providing customers with technical advancements and useful assistance in their efforts to create viable paint formulations,” says Nita Jacob, public relations and communications for Rohm and Haas South Africa. “The fundamental rationale for exposure sites is a simple one – there really is no alternative to actual exposure for establishing a paint’s exterior performance.

“Paint scientists use predictive laboratory

tests for development work, but no bench procedure can forecast exactly how a component or formulation will perform outdoors. Only the test fence can provide that information.

“This data gives scientists a better insight into the mechanisms that govern paint performance, which in turn will facilitate the development of formulations tailored to specifi c exposure conditions and the creation of new paint components. This enables Rohm and Haas to provide customers with useful assistance in their efforts to create viable paint formulations.”

The reason Rohm and Haas has so many exposure facilities is climatic variation and the different locations of the company’s exposure stations collectively provide a wide variety of exposure conditions. Interestingly, even relatively modest differences in climate can affect the durability of a paint.

How a paint weathers depends greatly on the combination of sunlight, temperature and the precipitation to which it is exposed. The more direct and intense the sunlight, the higher the temperature, ultra violet rays, light and ambient moisture levels. This means a more rapid paint deterioration.

But it is not only extreme climatic conditions that stress coatings. In the

case of temperature, wide fl uctuations also represent a rigorous test of coating fi lm performance. Dimensionally unstable substrates, such as yellow and white pine, undergo a signifi cant degree of expansion and contraction in response to temperature changes, in both the short and long term. This movement places signifi cant stress on the integrity of a paint covering the substrate.

The effect of fl uctuating temperatures can be even more severe on fi nishes applied over thin cracks on masonry substrates. These small fl aws experience such enormous temperature related changes in size (as much as 300% to 400%) in some environments, that even the best quality paints cannot accommodate their movement without rupturing.

Only elastomeric wall coatings (EWCs) based on high performance pure acrylic binders can provide satisfactory service in all these applications.

The Rohm and Haas decision to create and maintain a centralised database of exposure results represents an acknowledgement that the coatings industry is becoming increasingly global by nature. Paint manufacturers are looking to the international sector for new markets for their products and for new sources of raw materials.

QUICKIES-Interesting Info NUMBER 1

C.I.-COLOUR INDEX OF PIGMENTS

The Colour index (C.I.) of a pigment is a numerical system of the classifi cation of pigments, according to their chemical composition.

In a C.I. e.g. PR101 the 2 capital letters indicate the hue group and are derived from the English name for the colour group-in this case PR = Pigment Red , PY= Pigment Yellow, PG=Pigment Green etc .The number then indicates the chemical composition or class of the pigment, in this case PR101 is a red Iron oxide.

So pigments with the same C.I. from different manufacturers will

have the same chemical composition but this does not mean that the actual colours are identical because apart from the chemical composition, the production process and physical properties such as particle size and shape also play a signifi cant role in the fi nal shade.

For instance Bayferrox 110, 110M, 130, 140, 160 and 180 are all PR.101 but they are very different in particle size, shape and hue/undertone (as you go from 110 to 180 you go distinctly bluer).

R101 110 PR101 180

Phil Green – Paint Technologist

QUALITY ASSURANCE

65

Rohm and Haas exposure station

SERVONEWS 2008 – 1ST QUARTER – 15th FEB 2008

ISO 9001-2000SERVOCHEM HAS BEEN RECERTIFIED EFFECTIVE FROM 2008-2010

NEW STAFF AT SERVOCHEM JHB:

Elschke Slabbert Creditors

3rd Sept 2007

Tracey Harris Bookkeeper

1st April 2007

Leorations Africa Counting Clerk

Isaac Masina Messenger

Confort Sekgetla Driver

Johannes Mooka Decanting

THE FOLLOWING STAFF HAVE HAD THEIR BIG “0” BIRTHDAY’S IN 2007

Congratulations to Noeleen & Bradley Arthur who became proud parents to a baby girl Haylie Jazmin born 31st July 2007

Congratulations to Diane Brymer who became a proud grandmother to Dale Brymer who was born on 9th Oct 2007

Miranda Nel 50, Patrick Johnson 40, Bavani Naidoo 40, Vangie Bester 30,

Ian Campbell 30.

ANNIVERSARIES

Diana Ngcobo 10 Years, Daniel Fenyane 10 Years,

John Dikgale 10 Years

Congratulations to Ian & Zsuzsanna Campbell who became proud parents to a baby boy, Christopher John Campbell born on 23 May 2007.

CHANGES IN SERVOCHEM JHB

Jackie Crewe Brown has resigned from her position as Key Account Manager.

BIRTHS

B loc k R es is ta nc e in A c ry lic T rim P a int (P V C 18)

1

2

3

4

5

no wax

additive

0.5% 1.0% 1.5%

AQU AM AT 270 AQU AM AT 263

s o lid wa x

(poor )

(good)

AQUACER 539

A Unique Wax Dispersion to Improve Block Resistance and Hydrophobicity in Aqueous Coatings

H+Coatingcontaining SHIELDEX® particles

Environment(containing moisture H2O, oxygen O2 and aggressive Ions e.g. H+)

Metal Substrateelectrically conductive

2e- + H2O + 1/2O2 2OH-

Ca2+ + SiO32-

e-

SiO32- + H2O

Silica

Ca2+

2b

Fe2+ Fe3+ + e-Anode Cathode

2a

3b

4b

3a

4a

1a 1b

Silica

SiO2 + 2OH-

2Fe3+ + 3SiO32-

Ca2+

Silica

Fe2 Fe2+ + 2e-

Fe2 (SiO3)3 + CaSiO3

Ca2+

Ca2+

SilicaH+H+

Ca2+

H+

H+

Silica

Ca2+

SilicaH+

H+

H+Coatingcontaining SHIELDEX® particles

Environment(containing moisture H2O, oxygen O2 and aggressive Ions e.g. H+)

Metal Substrateelectrically conductive

2e- + H2O + 1/2O2 2OH-

Ca2+ + SiO32-

e-

SiO32- + H2O

Silica

Ca2+

2b

Fe2+ Fe3+ + e-Anode Cathode

2a

3b

4b

3a

4a

1a 1b

Silica

SiO2 + 2OH-

2Fe3+ + 3SiO32-

Ca2+

Silica

Fe2 Fe2+ + 2e-

Fe2 (SiO3)3 + CaSiO3

Ca2+

Ca2+

SilicaH+H+

Ca2+

H+

H+

Silica

Ca2+

SilicaH+

H+

H+Coatingcontaining SHIELDEX® particles

Environment(containing moisture H2O, oxygen O2 and aggressive Ions e.g. H+)

Metal Substrateelectrically conductive

2e- + H2O + 1/2O2 2OH-

Ca2+ + SiO32-

e-

SiO32- + H2O

Silica

Ca2+

2b

Fe2+ Fe3+ + e-Anode Cathode

2a

3b

4b

3a

4a

1a 1b

Silica

SiO2 + 2OH-

2Fe3+ + 3SiO32-

Ca2+

Silica

Fe2 Fe2+ + 2e-

Fe2 (SiO3)3 + CaSiO3

Ca2+

Ca2+

SilicaH+H+

Ca2+

H+

H+

Silica

Ca2+

SilicaH+

H+

H+Coatingcontaining SHIELDEX® particles

Environment(containing moisture H2O, oxygen O2 and aggressive Ions e.g. H+)

Metal Substrateelectrically conductive

2e- + H2O + 1/2O2 2OH-

Ca2+ + SiO32-

e-

SiO32- + H2O

Silica

Ca2+

2b

Fe2+ Fe3+ + e-Anode Cathode

2a

3b

4b

3a

4a

1a 1b

Silica

SiO2 + 2OH-

2Fe3+ + 3SiO32-

Ca2+

Silica

Fe2 Fe2+ + 2e-

Fe2 (SiO3)3 + CaSiO3

Ca2+

Ca2+

SilicaH+H+

Ca2+

H+

H+

Silica

Ca2+

SilicaH+

H+

SHIELDEX - Anticorrosion Pigments

Protection MechanismThe schematic representation below (Fig.1) demonstrates how aggressive ions permeate the paint fi lm. The release and subsequent migration of the calcium ions lead to the formation of a protective layer on the surface of the metal substrate.

Thus, the anti-corrosive mechanism is two-fold: adsorption of aggressive ions and the formation of a protective layer on the substrate. Behind this simplistic overview, a complex electrochemical process takes place, which is described in more detail in Fig. 2.

Detailed Protection MechanismThe electrochemical mechanism at the metal interface can be described as a local element. Metallic iron atoms are oxidized to ferrous ions (Fe2+) 1a and can then be further oxidized to ferric ions (Fe3+) at the anodic corrosion site.Due to the permeability of the organic coatings to oxygen and water, these are present at the coatings/metal interface where reduction of oxygen to OH– -ions 1b takes place as the cathodic reaction.Depending on the alkalinity in the coatings, silica can dissolve

as silicate ions 2a . This soluble fraction of the pigment can react with ferric ions 3a at the coatings/metal interface. This results in the formation of a protective layer 4a .

Parallel to this reaction, calcium ions on the silica surface are released 2b and – by reaction with the soluble silica 3b – can form a calcium silicate fi lm in alkaline regions on the metal surface. The calcium silicate particles precipitate together with the ferric silicate to reinforce the protective layer by formation of a mixed oxide layer on the metal surface 4b .

AQUACER 539

A Unique Wax Dispersion to Improve Block Resistance and Hydrophobicity in Aqueous Coatings

SHIELDEX - Anticorrosion PigmentsSHIELDEX - Anticorrosion Pigments

Protection Mechanism

2 3 4

Fig.1

Due to the global coating formulation trends and environmental concerns, the coalescing solvent level in high gloss or semi-gloss latex paints has been reducing over the last few years. At the same time the “modern” low VOC latex binders have a lower minimal fi lm forming temperature and a lower Tg than conventional binders. This results in severe blocking problems on a hot summers day, especially when the paint is used for doors and windows.

To improve the block resistance of aqueous systems, low polarity, higher melting point wax emulsions provide the best performance. The latest development in this fi eld is AQUACER 539, a specially modifi ed non-ionic PE wax emulsion with 35 % solids. This product provides not only an improvement of the blocking properties, but also a good hydrophobization of the surface. Shown in Fig.1, the block resistance can be improved effectively

Fig.1 Block Resistance in Acrylic Trim Paint (PVC 18)

when using 3 - 4.5 % as supplied on the total formulation weight.

For lower gloss coatings AQUAMAT 263 is recommended to improve block resistance, but this wax dispersion is less effective for anti-blocking, than AQUACER 539.

Fig.2 shows the result of an anti-blocking test of AQUACER 539 in comparison with AQUACER 515, a more polar wax dispersion. The result clearly shows the benefi ts of the lower polarity AQUACER 539.

Fig.3 indicates the improvement of hydrophobicity due to the increase of the contact angle of water on the surface by using AQUACER 539.

All Technical Data Sheets and MSDS can be found at www.byk.com.

A nti B loc k ing L a tex S y s tem

C o n tro l 1.5% A Q U A C E R 515 1.5% A Q U A C E R 539

Fig.2 Anti Blocking Latex System

W a ter R epellenc y in 100% A c ry lic E x terior C oa ting

Contact angle of water droplet

DosageAQUACER 539

0.5%

1%

(solid w ax on total form ulation )

86°

103 °

0% 76°

Fig.3 Water Repellency in 100% Acrylic Exterior Coating

For any further details please contact the local BYK representative

One immediate impact of the expansion is the increase in manufacturing capacity. Flowcrete South Africa Managing Director Ian Harrison confi rms, “At the time of our acquisition of Ivory Industrials back in 2006 our capacity trebled. This latest expansion has moved us further up the scale by an additional 30 percent.”

Flowcrete South Africa now employs over 70 people at three centres of operations in Durban, Johannesburg and Capetown, focusing on specialist seamless epoxy and polyurethane resin fl ooring. These operations

support a customer base of over 200 companies and deliver a turnover of R70 million per annum. A substantial proportion of the business in is construction chemicals and corrosion protection products, in particular abrasion resistant linings for use in the mining industry, coatings for galvanised structures and a wide range of acid resistant linings and coatings for use in the petrochemicals and piping industries.

Flowcrete was fi rst founded more than 25 years ago by a father and daughter team, Peter and Dawn Gibbins, in the UK. Two decades on,

the Group has developed a presence across much of the world with a staff of 200 people and an annual turnover that has grown exponentially to more than US$80 million. As Dawn Gibbins, now Chairman of the Group, adds, “Our new plant in South Africa marks another signifi cant milestone in the history of the Flowcrete Group. For most people, fl oors are just something to walk over, but we see them through different eyes. We are passionate about production quality, incorporating 5S, about training, about service excellence and about exceeding customer expectations in everything we do.”

Flowcrete South Africa Set to Floor New Markets with Latest Expansion

Flowcrete South Africa, the specialist fl ooring and construction chemicals company, is expanding for the third time in four years with the opening of a new manufacturing plant in Durban. With an investment value totalling around R9million (US$1.3 million), the new 3,500 square metre facility in Jacobs signals the company’s continued commitment to the South African manufacturing sector.