Viscosity measurement is of great significance in the fields of chemical engineering, material science and manufacturing. Cone-plate viscometer is a common instrument used to determine the viscosity of polyester resin, powder coatings and other substances in the molten state. This paper introduces the measuring method, principle and application of cone-plate viscometer in different fields.

Instruments and determination methods

The cone-plate viscometer is composed of a constant temperature heating plate, a rotating cone, a torque motor, a torque converter and a reading display system. In the measurement, the sample of about 0.1 grams is first accurately weighed and placed between a clean and clean plate and cone. Then choose the appropriate temperature, such as 150°C or 175°C, and heat the constant temperature. After the sample is melted and stabilized to the set temperature, the rotating cone is activated and the reading with the viscosity indicator constant is recorded. Two parallel tests were performed for each measurement, averaging and reporting the results.

Method and application of cone-plate viscometer

Principle of viscosity measurement

At constant temperature, the object is molten, the bottom of the static layer fluid is formed, and the upper layer fluid is driven by the rotating cone. In this process, there is a velocity gradient inside the fluid, and the internal viscosity is determined by the fluid of the measured object. The ICI cone-plate viscometer determines the viscosity of substances by this principle.

Application and reference standards

Cone plate viscometer is simple to operate, less samples, easy to clean, suitable for high viscosity measurement, and can directly read the viscosity value. This method is recommended in the United States for the viscosity measurement of powder coatings and is adopted as an ISO standard. In addition, standards such as ISO 28841-1 and DIN 53214 provide guidance on viscosity determination.

Method and application of cone-plate viscometer

Viscosity is the internal resistance of an object to flow in a liquid state, and its determination is crucial for the production and quality control of various materials. As a common and reliable measuring tool, cone-plate viscometers play an important role in various industries, providing an effective means to ensure material properties.