Pigment Properties

Question 1

Purpose of Pigment

Answer 1

Provide color
To obliterate previous colours
Provide properties needed by the paint formulator:
e.g.
To improve the strength of paint film
To improve adhesion of the paint film
To improve the durability and weathering properties
To increase the protection against corrosion
To reduce gloss
To modify flow and application properties

Question 2

What kind of pigment that is designed to Improve the Density of Paint film

Answer 2

Barium Sulfate

Question 3

What kind of pigment that is designed to improve adhesion of the paint film

Answer 3

Silane

Question 4

What kind of pigment that is designed to increase the protection against corrosion

Answer 4

Zinc Phospate, Iron Oxide

Question 5

What kind of pigment that is designed to reduce gloss

Answer 5

Silica / Quartz Powder

Question 6

What is tinting strength of a pigment

Answer 6

Tinting strength is the ability of a pigment to alter another mixture color shade, the higher the tinting strength of a pigment, the less pigment is used to achieve the desired shade

Question 7

9 Properties that you need to know about Pigment

Answer 7

Tinting Strength
Light Fastness
Bleeding Characteristics
Hiding Power
Refractive Index
Particle Size & Particle Shape
Specific Gravity
Chemical Reactivity
Thermal Stability

Question 8

Tinting strength formula

Answer 8

Amount of altered pigment = amount of tinting pigment x (tinting strength tinting pigment / tinting strength altered pigment)

Question 9

What is Lightfastness in a pigment

Answer 9

lightfastness is a property of a pigment that indicate the ability of a pigment to withstand UV light without breaking down

Question 10

What is Bleeding Characteristics

Answer 10

Solubility of a pigment in solvent

Question 11

What is hiding power of a pigment and what property can determine the hiding power of a pigment

Answer 11

Pigment ability of absorbing and scattering light, it also stops light from passing through
things that can determine the hiding power of a pigment
Refractive Index
Particle Size
Particle Shape

Question 12

What does refractive index do in pigment and what happens when the binder and pigment have similar refractive index

Answer 12

the higher the refractive index the more it can obliterate/hide the power beneath it.

If the film formers and pigment have similar RI, it will appear transparent

Question 13

What is oil absorptions in a pigment

Answer 13

is the amount of oil required to turn pigment into paste