1
Q
What is a structural/engineered pigment
A
pigment in which the properties have been chemically or mechanically altered
2
Q
what are some mechanisms to create engineered pigments
A
modified grinding
selective particle fractionation
flocculation
precipitation
chemical modification
co-structuring
3
Q
whats an example of a co-structured pigment
A
eg adding GCC and Talc to get the good brightness of GCC with high coverage of Talc
4
Q
Why would you want low density pigments
A
increase bulk and caliper
5
Q
how do you produce MCC
A
add weak acid with calcium carbonate to dissolve then suddenly increase pH to stop
6
Q
why would you want MCC
A
higher surface area and control of internal pores which lets us control absorption behaviour. Can also change the shape
Minerals
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