Pigment acid resistance test

After the pigment comes into contact with the acid solution, due to the interaction between the pigment and the acid, staining of the acid solution and discoloration of the pigment itself will occur. Acid resistance of the pigment refers to the ability of the pigment to resist the action of acid, causing staining of the acid solution and discoloration of the pigment. Acid and alkali resistance of pigments Some pigments are acid-resistant, such as iron blue and phthalocyanine blue, but iron blue is not alkali-resistant, and ultramarine is alkali-resistant but not acid-resistant. Therefore, when selecting pigments, attention should be paid to their acid or alkali resistance. The pigment acid resistance test determines the acid resistance of the pigment.
Zhongke Testing Reliability Experiment Center has the capability of reliability testing of various pigments and provides professional acid resistance testing services for pigments.

1. According to the chemical composition of pigments, they can be divided into two categories: inorganic pigments and organic pigments. According to their sources, they can be divided into natural pigments and synthetic pigments.
2. Pigments are classified according to their function, such as anti-rust pigments, magnetic pigments, luminescent pigments, pearlescent pigments, conductive pigments, etc.
3. From the perspective of production and manufacturing, it can be classified into titanium pigments, iron pigments, chromium pigments, lead pigments, zinc pigments, metallic pigments, and organic synthetic pigments.
4. From the perspective of application, it can be classified into paint pigments, ink pigments, plastic pigments, rubber pigments, ceramic and enamel pigments, pharmaceutical and cosmetic pigments, art pigments, etc.

1. Fill two cuvettes with the hydrochloric acid solution and the clear filtrate prepared by adding the hydrochloric acid solution as specified, and place the cuvettes into the colorimetric rack.
2. Under natural lighting facing north, the incident light is at an angle of 45° to the object being observed, and the observation direction is perpendicular to the surface of the object being observed. Visually evaluate the staining level of the filtrate against the gray sample card used to evaluate staining.

GB/T 5211.5-2008 Pigment resistance determination method
GB 250 gray sample card for assessing discoloration
GB 251 Gray sample card for stain assessment
GB/T 254 semi-refined paraffin
GB/T1864-1989 Comparison of pigment colors
GB/T 1914 Chemical analysis filter paper
GB/T 6682 Specifications and test methods for water in analytical laboratories
GB/T 10335.1 Coated paper and cardboard Coated art printing paper (coated paper)