Lithopone was developed in the s as a substitute for lead carbonate (lead white), to overcome its drawbacks of toxicity and poor weathering resistance. Within a few years, titanium dioxide displaced lithopone to become the white pigment (PW6) par excellence in the industry and the world&#;s best-selling inorganic pigment. However, titanium is a product whose price is subject to large price variations due to product availability. These price increases affect the competitiveness of finished products, and so the search for an alternative to titanium dioxide has generated a variety of possibilities to optimise its use.
Lithopone, an
alternative to titanium dioxide
Lithopone is a white pigment (PW5) co-precipitated from solutions of zinc and barium salts according to the following reaction:
ZnSO4 &#; BaS &#; BaSO4*ZnS
Thanks to its rheological and optical properties, Lithopone 30% offers both technical and economic advantages in the substitution of titanium dioxide in different applications. Among these advantages, it has been observed that Lithopone 30% has algaecidal properties in paints, which gives greater protection to the coating.
Studies have been carried out with both emulsion paints and powder paints, both with clear results on how the use of Lithopone 30% reduces the appearance of algae in the paint once it has been applied (see photos).
Lithopone 30% complies with both the REACH and Indirect Food Regulations, as well as with many European regulations regarding Toys, Packaging, Resins, etc&#;
The applications in which it can be used are paints, inks, plastics, elastomers, paper, fillers, adhesives&#;
Partial substitution of titanium dioxide in liquid paints
Lithopone 30% has a lower coverage power than titanium dioxide. For this reason, Lithopone 30% can only partially substitute titanium dioxide, between 5 and 40%.
Below 20% substitution, it is recommended to replace 1 kg of TiO2 with 1 kg of Lithopone.
Above 20%, it is recommended to replace 1 kg TiO2 with 1.3 kg of Lithopone 30%.
In order to achieve the same solids content, the larger filler and the binder should be reduced if necessary.
By doing so, we achieve cost reduction, increased film strength and improved fungicidal and algaecidal properties.
Example of partial substitution of titanium dioxide with Lithopone 30% in a liquid paint.
ComponentBase Paint10% TiO220% TiO240% TiO2
Ref 1:1Ref 1:1Ref 1:1WaterThickener (Celluoseether)Dispersing Agent, AcrylicLithoponeTiOCaCOBinderAdditives (Biocide, pH Corr., Antifoam, etc.)
Lithopone in plastics and masterbatch
Lithopone 30% increases extruder performance and reduces processing costs, improves quality and is suitable for masterbatch for injection of Polyolefins, ABS, Polycarbonate, Polypropylene, Polyethylene, Polystyrene, single layer films, multi-layer films and for white, coloured and filled masterbatch. The combination of Lithopone 30 with TiO2 results in improved mechanical properties including higher elongation values and better impact resistance.
Lithopone 30% applied in masterbatch has maximum purity, good opacity and reasonable light fastness.
Below 10% substitution, 1 kg of TiO2 should be replaced by 1 kg of Lithopone 30%.
Above 10%, 1 kg of TiO2 should be replaced by 1.3 kg of Lithopone 30%, reducing the amount of polymer accordingly.
Example of partial substitution of titanium dioxide with Lithopone 30% in a white
masterbatch
Lithopone in natural and synthetic elastomers
Lithopone 30% is a perfect alternative to titanium dioxide in all natural and synthetic pigmented elastomers, as it is non-abrasive and extremely acid resistant.
Lithopone 30%, in any type of rubber, not only reduces the cost of partial substitution of TiO2 but also increases industrial production and improves the durability and the thermal and mechanical resistance of the finished product.
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Lithopone in fillers, adhesives, joints and sealants
Lithopone 30% is the perfect solution for partial substitution of TiO2 in fillers due to its very soft nature and hardly any shrinkage properties.
It is suitable as an alternative to titanium dioxide when higher acid resistance is required, such as in adhesive joints and sealants.
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Product Description
White Powder Lithopone B311 for Coating & Paint Industrial
Product Details
High whiteness lithopone is a kind of new-style nontoxic, green, non- pollution lithopone, adopt unique nano technology production, coated by Silicon & Aluminum with characteristic resistance to acid and alkali, higher weathetability, nice optical performance, high whiteness and temperature resistant, strong hiding power and reducing power to prevent from yellow.
Lithopone B311(30%)
is a kind of lithopone whose hiding power is better than that of zinc oxide and worse than that of titanium dioxide.It has good heat-resisitance and is insoluble in water.
White powder, is a mixture of zinc sulfide and barium sulfate. Have high whiteness and good covering power. It is called Inorganic
white pigment. Widely used as white pigment of plastics such as polyolefin, vinyl resin, ABS resin, polystyrene, polycarbonate,
nylon and polyoxymethylene (POM), also for paint,ink ,grinding wheel and plaster. It is use to colourate for rubber products ,
linoleum, leather, paper, enamel.
Features
1) A white pigment produced by precipitation through filtering,
heating and quenching works
2) Has mostly been replaced by titanium dioxide which is more
durable, but it is much cheaper
Parameters
B311
B301
Total zinc and Barium sulphate, %
&#;99.0
&#;99.0
zinc sulfide content, %
&#;30.0
&#;28.0
zinc oxide content, %
&#;0.3
&#;0.6
Color, compared with standard samples
better
better
Tinter reducing power,
compared with standard samples
&#;105
&#;100
105°C volatile matter, %
&#;0.3
&#;0.3
Water solubles, %
&#;0.3
&#;0.4
Water suspension pH-value
6.0-8.0
6.0-8.0
Oil absorption, g/ 100g
&#;14
&#;14
Hiding power
&#; 5 % of standard sample
&#; 5 % of standardsample
White power, is a mixture of zinc sulfide and barium sulfate. Its whiteness, strong hiding power than zinc oxide, refractive index and opaque force than zinc oxide and lead oxide.
4. Applications
Lithopone B301, B311 is mainly used of coatings, printing ink, rubber, plastic, powder, profiles, paint, paper, plaster and leather, etc.
1) Used as a base for lake pigment
2) Used as a inert pigment for paint, ink and cosmetics
3) A large range of applications in plastic industry
4) Used as a filler in paper, leather, and linoleum
5.Packing and loading
25kgs plastic woven bags lined with polythene bags; 25MT per 1*20FCL
6.Storage
The product is a kind of white power which is safe, nontoxic and harmless. Keep from misture during transport and should be stored in a cool, dry condition. Avoid breathing dust when handling, and wash with soap & water in case of skin contact.
We are a comprehensive chemical enterprise which integrates the scientific and technological development, production,sale and
service.By now ,our company has been well-known and become one of the largest chemicals manufactures in China. Our products are
popular in the international market because of the superior quality and competiive price.
Contact us to discuss your requirements of lithopone powder. Our experienced sales team can help you identify the options that best suit your needs.