As an important indicator for measuring the effectiveness of defoamers, the accuracy and reliability of their evaluation methods are crucial for product development and production. With the advancement of technology, the evaluation methods and techniques for defoaming performance are constantly being updated and improved.

Visual observation is the most intuitive and simple evaluation method. The defoaming performance of defoamer can be preliminarily judged by observing the bursting speed and degree of foam. However, this method is greatly affected by human factors and has limited accuracy. The volume measurement method is to evaluate the defoaming performance by measuring the change of foam volume. After mixing a certain amount of foam and defoamer, measure the volume of foam regularly and calculate the volume change rate to evaluate the defoaming effect. This method is relatively accurate, but requires certain measuring equipment and time.

With the development of technology, more and more instruments are being used for evaluating defoaming performance. For example, laser scattering instrument and dynamic light scattering instrument can measure the particle size distribution and stability of foam; Conductivity meter can measure the conductivity change of foam liquid, so as to indirectly evaluate the defoaming effect. These methods have the advantages of high precision and sensitivity, but they are costly.

High throughput screening technology is a fast and efficient screening method that can evaluate the defoaming performance of a large number of defoamers in a short period of time. Through automated equipment and algorithms, rapid screening and optimization of defoamers can be achieved. Computer simulation technology can simulate the formation and bursting process of foam and predict the defoaming effect of defoamer. This method has the advantages of low cost, short cycle, and good repeatability, but its accuracy is affected by simulation models and parameter settings.

Nowadays, the application of nanotechnology and biotechnology in the field of defoamers is becoming increasingly widespread. The defoamers prepared through nanotechnology and biotechnology have excellent defoaming and environmental performance, providing new ideas and methods for the development of defoamers.

The evaluation methods and techniques for defoaming performance are crucial for product development and production. With the advancement of technology, more and more high-precision and high-sensitivity evaluation methods and techniques are being applied to the assessment of defoaming performance. In the future, with the continuous emergence and application of new technologies, the evaluation of defoaming performance will be more accurate, fast, and efficient.