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Test the coloring of the pigment

Pigment tinting force is also known as real strength. Highly colored pigments, in use can reduce the amount used to improve economic value, which is the user considerable attention to the project. For example, benzidine yellow tinting high, higher than chrome yellow 9 times, while chrome yellow and 3-4 times higher than titanium yellow. For example, the light-resistant yellow G coloring force of 100, fast yellow 10G only 48.

The coloring force of the pigment is measured in the same manner as in the case of pigments. Standard coloring of the sample set at 100%, according to product standards, test samples not less than 95%.

Determination of the color of the method compared to the color of the pigment is a white pigment such as zinc barium white or titanium white, zinc oxide to fill the light, and then in the standard sample color strength comparison. When the color strength of the sample is greater than or less than the standard coloring force, the amount of standard sample can be increased and used to calculate the color of the sample%.

A method for the determination of coloring force for intermediate control is to properly weigh the sample and the standard sample, hand-grinding with 75% zinc oxide or 60% rutile titanium dioxide white ink, and the consumption of white ink The amount of calculation of color strength, the determination of time and effort, the results are quite correct, but a non-standard measurement method.

The relatively new method of determining the relative color strength of the pigment and the relative scattering force of the white pigment is to measure the absorption index of the prepared sample and the absorption index of the sample by a spectrophotometer, and the ratio of the two is expressed as a percentage The The same white pigment in the black pigment paste can be used after the instrument measured the sample and the standard scattering index, the ratio of the two and expressed as a percentage of the relative scattering force. The principle and determination method can refer to GB / T 13451.2-92 standard.