As paint additives, the status of titanium pigment in inks is irreplaceability, this is because several major performance of Titanium dioxide which in the decision quality of pigment ink is much better than the other white pigments. Such as refractive index, reducing power, covering power and oil absorption, etc.
For refractive index part of white pigments, titanium dioxide has obvious advantages. Under the same conditions, the refractive index of rutile titanium dioxide is 2.76, the refractive index of anatas titanium dioxide is 2.55, the refractive index of zinc sulfide is 2.37, the refractive index of lithopone is 1.84, the refractive index of lead white was 2.00;
In terms of reducing power, titanium dioxide showed better performance than others white pigment. The reducing power value of rutile rutile titanium dioxide is 100, the reducing power value of anatas titanium dioxide is 77, the reducing power value of zinc sulfide is 40, the reducing power value of lithopone is 16, the reducing power value of lead white is 9;
In the aspect of hiding power, the advantages of titanium dioxide is outstanding. The hiding power value of rutile rutile titanium dioxide is 100, the hiding power value of anatas titanium dioxide is 78, the hiding power value of zinc sulfide is 39, the hiding power value of lithopone is 18, the hiding power value of lead white is 12;
In addition of every 100 grams of white pigment oil absorption, oil absorption of rutile titanium dioxide is 25 grams, oil absorption of anatas titanium dioxide is 30 grams, oil absorption of zinc sulfide is 15 to 25 grams, oil absorption of lithopone is 14-16 grams, oil absorption of lead white is 8 to 15 grams, demonstrated the oil absorption of the titanium dioxide is the best.
In ink products, refractive index, reducing power, covering power and oil absorption ,this four key performance supporting the quality of ink, and titanium dioxide can meet the demand on the four keys performance which others white pigments cannot meet , so the titanium dioxide as ink additives is more suitable than other white pigment.
