1. Introduction
The viscosity of architectural coatings is one of the important indexes that affect its flowability, construction performance and coating effect. Accurate determination of viscosity is of great significance to the production, quality control and application of Coatings. This article will introduce a commonly used viscosity determination method: Stormer Viscometer method.
2. Testing principles and methods
The Stormer Viscometer method characterizes the viscosity of a Coating by measuring the load required to produce a 200 rpm Rotation speed under a swirl/spin rotor. The viscosity of the Coating is usually expressed in grams of the load or in Krebs (KU value) units of the logarithmic function of the load.
3. Equipment
Test with the swirl/spin paddle Viscometer, which features a strobe Timer to control the Rotation speed of the swirl/spin paddle. The R swirl/spin paddle Viscometer measures the viscosity of non-Newtonian liquids, including most Coatings, through mechanical operation of the load and a strobe observer.
4. Operation points
When measuring the viscosity of architectural coatings, the following operation points should be paid attention to:
Mix well: Mix the Coating well and move it into the container to ensure that the temperature of the Coating and Viscometer remains stable (23 +/- 0.2 ℃).
Immersion in Coating: Immerse the rotor in the Coating so that the Coating liquid level just reaches the mark on the rotor shaft.
Method A and method B test: A method (no stroboscopic Timer) and method B (stroboscopic Timer) are used for the test, and the repeability is measured until a consistent load value is obtained.
5. Results presentation and precautions
The test results are expressed in grams or KU values. In method A, the KU value is obtained through the correspondence table between the load and the KU value according to the number of grams of load required to generate 100/30 seconds. In method B, the KU value is also obtained through the correspondence table between the load and the KU value according to the number of grams of load required to generate the 200 rpm or 200 rpm/30 second pattern.
6. Application and meaning
The viscosity measurement of architectural coatings has important applications and significance in the building materials industry:
Quality control: Viscosity determination is an important means of Coating quality control to ensure conformity between Coating batches.
Construction performance: Coating viscosity directly affects its flowability and coating performance during construction, thus affecting the construction effect of Coating.
Formulation adjustment: Coating formula adjustment can be guided by viscosity measurement to obtain product performance that meets design requirements.
7. Conclusion
The Stormer Viscometer method is a commonly used method for viscosity determination of architectural coatings, which characterizes the viscosity of coatings by measuring the load of coatings under swirl/spin rotors. This method has important application value in the production and application of architectural coatings, which helps to improve the mass and performance of products, and also provides strong support for scientific research and technological development in the Coating industry.
