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Exposant : RIO TINTO MINERALS
Talc for Coatings (brochure générale de présentation)
Extrait du catalogue : Talc for Coatings (brochure générale de présentation)
Talc for Coatings
Rio Tinto Minerals offers coating formulators a unique range of talcs and related minerals to cover the paint industry's wide range of applications.
Talc is...
a rock, the softest rock in the world. It is a hydrous magnesium silicate with the general chemical formula Mg3Si4O10(OH)2. Talc is lamellar, hydrophobic and inert. As a natural ore it is almost always found in combination with at least one other mineral. The most common of these is chlorite, a chemically and structurally similar hydrous magnesium aluminium silicate. Other associated minerals often found with talc include dolomite and magnesite; their proportion depends on the geological origin of the ore. Each combination of talc with its associated minerals possesses unique properties and confers specific functions for a particular end use. In other words, talc is many talcs.
A specialised range of products for the coatings industry
From its diversity of talc ores, Rio Tinto Minerals produces a wide range of coatings-specific products covering all applications. We achieve this through our unrivalled variety of minerals, which include talcs, chlorites, talc-chlorites, and a mica-quartz-chlorite combination. All of these minerals share the following characteristics to a greater or lesser extent.
Chemical inertness
Crystalline structure of talc
Lamellarity
The basic talc crystal structure is composed of a layer of magnesium-oxygen octahedra, sandwiched between two layers of tetrahedral silicate. These structural features give talc and related minerals their lamellarity. Although the binding forces within each of these triple layers are strong, the forces between one triple layer and the next are very weak. As a consequence, the platelets slide apart at the slightest touch, giving talc its characteristic softness. Compared to granular fillers, talc and its related minerals have extremely lamellar platelets which give them a high specific surface area. This influences the mechanical and optical properties as well as the anti-corrosion performance of coatings.
The main surfaces of the talc platelets are those extending in the x-y plane as seen in the idealised structure above. They present a fully bonded surface, made up of non-polar silicon-oxygen tetrahedra, which are chemically inert. Theory suggests that this arrangement accounts for talc's stability in both acid and alkali conditions and in other coatings constituents.
Hydrophobicity
Hydrophobicity is a further consequence of the non-polarity of talc's platelet surfaces, where hydrogen bonding or dipolar interactions are limited. This enhances properties such as scrub resistance and exterior durability.
Formulation support
Rio Tinto Minerals' coatings team works directly with customers to choose the most suitable talc product for their application. We can also help to optimise formulations in terms of cost and performance.
Well-known products from Rio Tinto Minerals' talc range include: · Mistron®: talc · Luzenac 20M0: talc - chlorite · Steopac®: talc - chlorite · Steabright®: talc - chlorite · Steamat®: talc - chlorite · Plastorit®: mica - quartz - chlorite
Multi-functional talc products for decorative and industrial coatings
Rio Tinto Minerals offers coatings formulators a unique range of talcs and related minerals that cover the paint industry's wide range of applications. The choice of product depends very much on the functionality required in the specific coating application. Here are examples of the key functions.
Dry hiding and TiO2 extender
Highly lamellar talc platelets with a high specific surface area allow more air to be incorporated into the film as it dries, giving an effect of `dry hiding' above the CPVC. The platelets also improve TiO2 extender utilisation through better spacing. Talc therefore helps to optimise prime pigment efficiency. Recommended talcs for this function are fine grind, high brightness products.
Anti-cracking
Through the interaction of the paint binders and other paint components with the talc lamellae, there is a strong resistance to the tensions that build up in the drying film as it shrinks. A similar effect is seen with other crack forming processes caused by binder cross-linking (film forming) and substrate movement (crackbridging). Talc and related minerals are used to give a significant reduction in cracking, which in turn improves coating appearance and durability.
Matting
The key parameter here is the particle size distribution of the talc. In decorative matt paints at high PVC, coarse grades can be used to obtain a deep matt finish; finer talcs are used in varnishes and low PVC paints to obtain semi-gloss or matt finishes.
Rheology
The physicochemical interactions between the talc particles and resins or other paint components impart a notable rheological effect. These interactions increase low-shear viscosity which helps improve application rheology and reduce sagging. Together with the platelet form, they also significantly reduce settling.
VOC reduction
Due to their low viscosity in polar systems, chlorite containing products are particularly suitable for formulating to low VOC. Oil absorption values are often misleading and are not used in practice for VOC calculations. The critical parameter is the measured viscosity in the coating medium.
Anticorrosion
The orientation of the talc platelets protects the substrate by impairing water diffusion through the film. This is known as the `barrier effect'. Theory indicates that the hydrophobic nature of the talc platelets contributes to this effect. It can also be shown that the platelets provide adhesion.
Supporting our customers' long-term development
Rio Tinto Minerals creates value for its customers by drawing on its world-class mining operations and in-depth experience of coatings technology. Our coatings-specific technical and sales teams are the key interface to achieving this.
Adding formulation value
Matching different minerals with paint performance requirements has led to close collaboration between Rio Tinto Minerals and its customers. Our team can save you time and bring you added performance by drawing on its wide-ranging experience in the use of extenders in coatings systems. Our coatings formulation labs in France and the United States have built a solid reputation in helping customers develop new formulations.
Developing innovative solutions
Fully aware that innovation is the key to the long-term development of our customers, Rio Tinto Minerals annually invests at least 3% of its revenues in R&D. Over the past two decades, Rio Tinto Minerals has been active in researching the use of talc and related minerals as functional extenders in coating. Our commitment is to continue identifying future applications that will bring added value to our customers.
Coatings-specific customer formulation assistance
Steopac® talc for good dispersion and TiO2 extender effect
Plastorit® 000 for low VOC applications
Steamat® as a matting agent
1975
1980
A range of talc-chlorites for coatings
1990
1993
Steabright® a micronised extender for decorative coatings
1998
2000
Mistron Monomix® G in flexographic inks
2004
2006
High Aspect Ratio (HAR®) talc in can and coil coatings
Delivering the goods
Rio Tinto Minerals' industry-specific sales teams ensure day-to-day back-up, providing customers with their experience and indepth knowledge of our minerals. Our sales administrators organise the optimum transport, warehousing and product delivery form for our customers applications. With over 40 production sites worldwide, Rio Tinto Minerals is a truly global supplier, providing customers with optimised logistics and costs. And with talc ore reserves for the next half century, we will continue delivering the goods for many years to come.
About Rio Tinto Minerals
Rio Tinto Minerals is the acknowledged world leader in developing industrial minerals-- building blocks for life, and for products that contribute to better living--and in developing solutions to build its customers' businesses. · Minerals that make a difference Consistent product quality secured by ISO 9000:2001 registration of its quality management systems. · People who make a difference World leaders in talc applications and science, technical support and customer service. · Solutions that make a difference Strategic Inventory Placement and long-term contracts with shippers to ensure supply reliability.
About Luzenac products
Luzenac brand talcs constitute 25 percent of all talc consumed worldwide. The softest mineral on earth, talc's unique properties make it an ideal component in thousands of applications in a wide range of industries, including paper, paints, plastics, ceramics, personal care and foodstuffs.
Minerals
For more information, please visit www.riotintominerals.com
that make a difference
April 2007
Rio Tinto Minerals offers coating formulators a unique range of talcs and related minerals to cover the paint industry's wide range of applications.
Talc is...
a rock, the softest rock in the world. It is a hydrous magnesium silicate with the general chemical formula Mg3Si4O10(OH)2. Talc is lamellar, hydrophobic and inert. As a natural ore it is almost always found in combination with at least one other mineral. The most common of these is chlorite, a chemically and structurally similar hydrous magnesium aluminium silicate. Other associated minerals often found with talc include dolomite and magnesite; their proportion depends on the geological origin of the ore. Each combination of talc with its associated minerals possesses unique properties and confers specific functions for a particular end use. In other words, talc is many talcs.
A specialised range of products for the coatings industry
From its diversity of talc ores, Rio Tinto Minerals produces a wide range of coatings-specific products covering all applications. We achieve this through our unrivalled variety of minerals, which include talcs, chlorites, talc-chlorites, and a mica-quartz-chlorite combination. All of these minerals share the following characteristics to a greater or lesser extent.
Chemical inertness
Crystalline structure of talc
Lamellarity
The basic talc crystal structure is composed of a layer of magnesium-oxygen octahedra, sandwiched between two layers of tetrahedral silicate. These structural features give talc and related minerals their lamellarity. Although the binding forces within each of these triple layers are strong, the forces between one triple layer and the next are very weak. As a consequence, the platelets slide apart at the slightest touch, giving talc its characteristic softness. Compared to granular fillers, talc and its related minerals have extremely lamellar platelets which give them a high specific surface area. This influences the mechanical and optical properties as well as the anti-corrosion performance of coatings.
The main surfaces of the talc platelets are those extending in the x-y plane as seen in the idealised structure above. They present a fully bonded surface, made up of non-polar silicon-oxygen tetrahedra, which are chemically inert. Theory suggests that this arrangement accounts for talc's stability in both acid and alkali conditions and in other coatings constituents.
Hydrophobicity
Hydrophobicity is a further consequence of the non-polarity of talc's platelet surfaces, where hydrogen bonding or dipolar interactions are limited. This enhances properties such as scrub resistance and exterior durability.
Formulation support
Rio Tinto Minerals' coatings team works directly with customers to choose the most suitable talc product for their application. We can also help to optimise formulations in terms of cost and performance.
Well-known products from Rio Tinto Minerals' talc range include: · Mistron®: talc · Luzenac 20M0: talc - chlorite · Steopac®: talc - chlorite · Steabright®: talc - chlorite · Steamat®: talc - chlorite · Plastorit®: mica - quartz - chlorite
Multi-functional talc products for decorative and industrial coatings
Rio Tinto Minerals offers coatings formulators a unique range of talcs and related minerals that cover the paint industry's wide range of applications. The choice of product depends very much on the functionality required in the specific coating application. Here are examples of the key functions.
Dry hiding and TiO2 extender
Highly lamellar talc platelets with a high specific surface area allow more air to be incorporated into the film as it dries, giving an effect of `dry hiding' above the CPVC. The platelets also improve TiO2 extender utilisation through better spacing. Talc therefore helps to optimise prime pigment efficiency. Recommended talcs for this function are fine grind, high brightness products.
Anti-cracking
Through the interaction of the paint binders and other paint components with the talc lamellae, there is a strong resistance to the tensions that build up in the drying film as it shrinks. A similar effect is seen with other crack forming processes caused by binder cross-linking (film forming) and substrate movement (crackbridging). Talc and related minerals are used to give a significant reduction in cracking, which in turn improves coating appearance and durability.
Matting
The key parameter here is the particle size distribution of the talc. In decorative matt paints at high PVC, coarse grades can be used to obtain a deep matt finish; finer talcs are used in varnishes and low PVC paints to obtain semi-gloss or matt finishes.
Rheology
The physicochemical interactions between the talc particles and resins or other paint components impart a notable rheological effect. These interactions increase low-shear viscosity which helps improve application rheology and reduce sagging. Together with the platelet form, they also significantly reduce settling.
VOC reduction
Due to their low viscosity in polar systems, chlorite containing products are particularly suitable for formulating to low VOC. Oil absorption values are often misleading and are not used in practice for VOC calculations. The critical parameter is the measured viscosity in the coating medium.
Anticorrosion
The orientation of the talc platelets protects the substrate by impairing water diffusion through the film. This is known as the `barrier effect'. Theory indicates that the hydrophobic nature of the talc platelets contributes to this effect. It can also be shown that the platelets provide adhesion.
Supporting our customers' long-term development
Rio Tinto Minerals creates value for its customers by drawing on its world-class mining operations and in-depth experience of coatings technology. Our coatings-specific technical and sales teams are the key interface to achieving this.
Adding formulation value
Matching different minerals with paint performance requirements has led to close collaboration between Rio Tinto Minerals and its customers. Our team can save you time and bring you added performance by drawing on its wide-ranging experience in the use of extenders in coatings systems. Our coatings formulation labs in France and the United States have built a solid reputation in helping customers develop new formulations.
Developing innovative solutions
Fully aware that innovation is the key to the long-term development of our customers, Rio Tinto Minerals annually invests at least 3% of its revenues in R&D. Over the past two decades, Rio Tinto Minerals has been active in researching the use of talc and related minerals as functional extenders in coating. Our commitment is to continue identifying future applications that will bring added value to our customers.
Coatings-specific customer formulation assistance
Steopac® talc for good dispersion and TiO2 extender effect
Plastorit® 000 for low VOC applications
Steamat® as a matting agent
1975
1980
A range of talc-chlorites for coatings
1990
1993
Steabright® a micronised extender for decorative coatings
1998
2000
Mistron Monomix® G in flexographic inks
2004
2006
High Aspect Ratio (HAR®) talc in can and coil coatings
Delivering the goods
Rio Tinto Minerals' industry-specific sales teams ensure day-to-day back-up, providing customers with their experience and indepth knowledge of our minerals. Our sales administrators organise the optimum transport, warehousing and product delivery form for our customers applications. With over 40 production sites worldwide, Rio Tinto Minerals is a truly global supplier, providing customers with optimised logistics and costs. And with talc ore reserves for the next half century, we will continue delivering the goods for many years to come.
About Rio Tinto Minerals
Rio Tinto Minerals is the acknowledged world leader in developing industrial minerals-- building blocks for life, and for products that contribute to better living--and in developing solutions to build its customers' businesses. · Minerals that make a difference Consistent product quality secured by ISO 9000:2001 registration of its quality management systems. · People who make a difference World leaders in talc applications and science, technical support and customer service. · Solutions that make a difference Strategic Inventory Placement and long-term contracts with shippers to ensure supply reliability.
About Luzenac products
Luzenac brand talcs constitute 25 percent of all talc consumed worldwide. The softest mineral on earth, talc's unique properties make it an ideal component in thousands of applications in a wide range of industries, including paper, paints, plastics, ceramics, personal care and foodstuffs.
Minerals
For more information, please visit www.riotintominerals.com
that make a difference
April 2007
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