What are the technical requirements for mica pearlescent pigments? How to prepare samples?

Mica pearlescent pigment is a new type of pearlescent pigment. It uses mica as the base material, and its surface is coated with metal oxides such as titanium dioxide and iron oxide. It has been widely used in coatings, inks, plastics, leather, cosmetics and other industries.

Today we will introduce the regulations of HG/T 3744-2004 on mica pearlescent pigments. Before testing, we need to understand the classification of mica pearlescent pigments, which are divided into: silver white series, rainbow series, iron oxide metal series and iron-titanium composite metal series.

Item detection

1. Appearance: By visual observation, the appearance of the silver white series is required to be pearl white powder, the rainbow series is gray phase white powder, the iron oxide metal series is bronze~purple powder, and the iron-titanium composite metal series is golden~brown Yellow powder is considered up to standard.

2. Brightness: the coating film on black and white cardboard is more than 150g/m², and the reflectivity is required to be similar to ~ better than the reflectivity of blackboard ≤ 1%, and the reflectivity of whiteboard (80±2)%.

3. Color: Visual observation is required, and the sample must be approximately to slightly smaller than the reference sample to meet the standard; instrumental detection is required, silver-white series △E≤1.0, rainbow series, iron oxide metal series and iron-titanium complex Phase metal series △E ≤ 1.5 can be considered up to standard.

4. Particle size distribution: Use a particle size distribution analyzer for detection, and the particle size distribution of the sample is required to be basically consistent with the reference sample before it can be considered up to standard.

5. Impurity content: It is required that the sample must be ≤0.10% to meet the standard.

6. Volatile matter at 105°C: It is required that the sample must be ≤0.5% to meet the standard.

7. Oil absorption: It is required that after the test, the sample can finally form a uniform clump and be scooped up without cracking or breaking to meet the standard.

8. The conductivity of the water suspension and the PH value of the water suspension are determined by the testing parties according to the actual testing requirements.