Technical indicator meaning :
NSA surface
We use BET (Brunauer –Enmet -Teller) namely the low -temperature nitrogen absorption method to measure . We can also use the common simple Iodine absorption one . The result indicates the surface area pergram(m2/g) . has .
Particle size :
Various kinds of carbon black particle size listed are to show the carbon black grow particle size originally in the form . It is measured by the electronic microscope and is the average of several particles .
Absorption value of DBP
Using the neighbor DBP medium to absorb carbon black . The consumption of DBP when absorbing in balance . It stands for the size of the structure of carbon black , the higher the DBP is , the higher carbon black structure is , when the former is low , the latter is low , too .
Tint strength :
It shows the ability of carbon black to dye lean type . Generally , the tint strength is high , its covering performance is good . The testing method goes on according to ASTM-3265 .
Volatile content
It is functional group including oxygen (carboxylgruppen , chinoide carboxylgruppen , and lactolgruppen phenolgruppen ) , these base content of group represent the carbon black surface chemical property to be absorbed itself . It has relationship with PH value .
PH value :
It is a measurement to determine whether it belongs to acid or alkaline . Generally , the furnace carbon black belongs to alkaline (PH >7) . Only after treatment , the PH value of carbon black is between 3 and 5 , and the volatile matter is high .
Apparent Density :
The weight of carbon black of unit volume is g/1 , showing the room various kinds of carbon black account for . The heavier the grain size makes , the heavier the apparent density is , it the same on the contrary . Grain size has influence on the dispersion of the carbon black , especially in plastics and paint (printing ink ) .
Moisture :
It is used to measure the moisture content of carbon black under certain temperature . It associates with the environment of the formulation of carbon black .
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The relativity of Particle size and structure |
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