Abstract: As a common tool for measuring the viscosity of coating, the viscosity cup of coating -4 needs to be calibrated regularly in the process of use to ensure the accuracy of the measurement results. In this paper, three methods for the calibration of coated -4 viscosity cups are introduced: kinematic viscosity method, standard viscosimeter method and Engelar conditional degree method, and the steps and principles of each method are described in detail.

1. Introduction

As a common viscosity measurement tool in the coating industry, the coat-4 viscosity cup is widely used in the production and quality control process. However, regular calibration is required to ensure that the measurement results of the coated -4 viscosity cup are accurate and reliable. The calibration process can be carried out in a variety of ways, and three common calibration methods will be introduced in this paper.

Calibration method for coated -4 viscosity cup

2. Kinematic viscosity method

Kinematic viscosity method is a calibration method in which the kinematic viscosity of different standard oils is determined by using a capillary visvisometer and then the calibration of the coated -4 viscosity cup is carried out using a standard oil with known kinematic viscosity at a specific temperature. According to the kinematic viscosity of the standard oil, the standard outflow time T of the coated -4 viscosity cup can be calculated. By measuring the outflow time t, the correction coefficient K can be calculated, and the formula is as follows:

T = 0.223v + 6 (23s ≤ T< 150s)

T = 0.154u + 11 (T< 23s)

Where T is the standard outflow time, v is the kinematic viscosity, and t is the measured outflow time. The final correction coefficient K is the average of a series of correction coefficients.

The calibration method of coated -4 viscosity cup is illustrated in Figure 1

Calibration method for coated -4 viscosity cup

3. Standard viscometer method

The standard visvisometer method is another calibration method that uses a standard viscosity cup (K value cup) to check the viscosity cup of -4 coating. The standard viscosity cup has a known viscosity value, and the correction factor K can be obtained by comparing the measured results of the coated -4 viscosity cup with the value of the standard viscosity cup.

4. Ngla conditional degree method

The Engella conditioning method is the third calibration method and calculates the correction factor K using the ratio of the time required for a sample to flow 200mL from an Ennerian viscometer at a specific temperature to the time required for distilled water to flow the same volume at 20°C. This method has a narrow scope of application and is gradually replaced by other methods.

Step 5 Summarize

There are several ways to calibrate the viscosity cup of coating -4, and each method has its own application. Regardless of the method used, the purpose of calibration is to ensure the accuracy and reliability of the measurement results. In coating production and quality control, the calibration of coat-4 viscosity cup is an important step to ensure product quality, which can improve the controllability and stability of coating manufacturing process.

Calibration method for coated -4 viscosity cup

6. Reference standards

The calibration method presented in this paper refers to the national standard GB/T 1723. In practice, the proper calibration method should be selected according to the characteristics and requirements of the coating, and the calibration steps should be carried out in strict accordance with the standards to ensure the accuracy and reliability of the measurement.