The earlier blackness was used to grade the quality of carbon black. With the development of pigment carbon black, it is widely used in ink, paint and other industries as black pigments. Carbon black for rubber is mainly used in tire industry, rubber seals, shock absorbers, etc. . Therefore, in addition to carbon black, which needs to be measured for blackness, ink, paint, masterbatch, tires, and rubber all need to be measured for blackness.
The solution of color spectrum Spectrophotometer for blackness measurement:
first step:
According to different sample forms, choose the appropriate blackness meter model.
| CS-820 | CS-800 | CS-660 | |
| Solid surface (rubber, carbon black film) | √ | √ | √ |
| Paste, powder (ink, carbon black) | √ | √ | |
| Granules (black masterbatch) | √ |
CS-820 (high-end type) CS-800 (middle and high-end type) CS-660 (economical type)
Step 2: Selection of measurement scheme
①. According to the national standard GB/T 7048-2012, reflectance is used to represent the blackness value of the sample.
Just measure the Y value in the instrument parameters, the Y value ranges from 0 to 100, the larger the value, the smaller the blackness.
②. The international standard is expressed by three parameters MY, MC and dM, where dM=MY-MC.
The MY value is calculated from the reflectivity, the higher the MY value, the higher the blackness.
dM: Indicates blue phase black or red phase black,
When dM>0, it is a blue phase; when dM<0, it is a red phase;
Generally, the blue phase carbon black is darker than the red phase carbon black, so the higher the MY and dM, the better.
Select the blackness parameter in the instrument, and directly measure the MY and dM values. The MY value ranges from 0 to 400, and dM is a positive or negative value.
