Micronized Calcite
CaCO3 in Paints
and Coatings
Recently calcium carbonate is a
significant material in the modern paint production.
Having
convenient particle distribution curve, CaCO3 improves the coverage in paints.
Besides, with the high quality whiteness, it is used in the production of
bright white paints and surface covering. It also prevents corrosion with the
buffer impact. In addition, CaCO3 facilitates the dispersion of the pigments
that results in lower cost in paint production. Furthermore, low corrosiveness
of CaCO3 improves the rubbing property of surface covering which reduces the
corrosion of the material used in paint production. CaCO3 has low oil
absorption rate which helps to produce the paints with high rubbing resistance.
Being an environment friendly material, CaCO3 could be used in the internal
paintings. High quality calcite usage reduces the amount of titanium that is
used for bright whiteness, thus it substantially reduces the cost.
CaCO3 in Paper
Micronized calcite is
particularly used to produce papers, cardboards, and wall papers by being added
into cellulose.
Being
cheap and white, calcite has replaced with kaolin in paper industry in last 10
years. Recently, paper industry is using alkali system, which prevents the
yellowness and uses more calcite instead of kaolin. This means there is less
cellulose and optic whitener consumption. The grinded calcite is used in the
half of the 18-20x106; tones of paper industry in the world, where PCC (25-30%
coated calcite) is used in the other half.
In Europe, calcite (<2microns) is used in paper industry with the
proportions of 75% water and 25% solid as a filling material. In Turkey, SEKA
and some private companies control the particle distribution of calcite. The
approximate sale in paper industry is 5x10³ tones in Turkey.
CaCO3 in PVC
And Plastics
Natural
calcium carbonate is mostly used filler material in the plastic industry. It
increases the electrical resistivity, which results with the increasing performance
of the product.
It also supplies higher
productivity by the high heat transfer property. Besides, it develops the
process by affecting the thermal conductivity and the stickiness because of
melting.
In addition to the economical benefits, there are several reasons for CaCO3 to
be used in the PVC and Plastic industry, such as;
• increasing the color quality because of the whiteness
• transferring heat and increasing strength
• controlling the rheological properties of PVC
• improving the slipperiness, anti-block and suppression properties of PE films
• increasing resistance in V-belt
• helping polymer mixtures to get ready for processing
• decreasing the cost by filling function
For these reasons, nowadays the natural calcium carbonates are the most widely
used filling material in the polymer granules.
CaCO3 in Food
Micronized
calcite is used as an additive in foods such as biscuits, bread, chewing gum
etc. Because of the chemical purity, color and decrease in the cost, it is used
as an indirect source of calcium.
Micronized
calcite is used as an additive in foods such as biscuits, bread, chewing gum
etc. Because of the chemical purity, color and decrease in the cost, it is used
as an indirect source of calcium.
Coated Calcium Carbonate
|
Product |
< 2 µm |
d 50 |
d 97 |
|
AY103 K |
77% ± 5% |
1,2 ± 0,2 micron |
3,5 ± 0,5 micron |
|
AY103 KCS |
77% ± 5% |
1,2 ± 0,2 micron |
3,5 ± 0,5 micron |
|
AY106 K |
60% ± 5% |
1,6 ± 0,2 micron |
6,5 ± 0,5 micron |
|
AY107 K |
55% ± 5% |
1,7 ± 0,2 micron |
7,5 ± 0,5 micron |
|
AY108 K |
54% ± 3% |
1,8 ± 0,2 micron |
8.5 ± 0,5 micron |
|
AY210 K |
46% ± 5% |
2,2 ± 0,5 micron |
10 ± 1 micron |
|
AY212 K |
45% ± 5% |
2,3 ± 0,5 micron |
12 ± 1 micron |
|
AY215 K |
42% ± 5% |
2,5 ± 0,5 micron |
14 ± 1 micron |
|
AY320 K |
35% ± 5% |
3,5 ± 0,5 micron |
20 ± 2 micron |
Natural Calcium Carbonate
|
Product |
< 2 µm |
d 50 |
d 97 |
|
AY103 |
77% ± 5% |
1,2 ± 0,2 micron |
3,5 ± 0,5 micron |
|
AY106 |
60% ± 5% |
1,6 ± 0,2 micron |
6,5 ± 0,5 micron |
|
AY107 |
55% ± 5% |
1,7 ± 0,2 micron |
7,5 ± 0,5 micron |
|
AY108 |
54% ± 3% |
1,8 ± 0,2 micron |
8,5 ± 0,5 micron |
|
AY210 |
46% ± 5% |
2,2 ± 0,5 micron |
10 ± 1 micron |
|
AY212 |
45% ± 5% |
2,3 ± 0,5 micron |
12 ± 1 micron |
|
AY215 |
42% ± 5% |
2,5 ± 0,5 micron |
14 ± 1 micron |
|
AY320 |
35% ± 5% |
3,5 ± 0,5 micron |
20 ± 2 micron |
|
AY540 |
28% ± 5% |
5,5 ± 0,5 micron |
40 ± 2 micron |
|
AY560 |
27% ± 5% |
6,5 ± 0,5 micron |
60 ± 2 micron |
|
AY780 |
23% ± 3% |
10 ± 1 micron |
80 ± 2 micron |
