Views: 0 Author: Site Editor Publish Time: 2024-07-30 Origin: Site
In order to improve the efficiency of washing, people try to make full use of various mechanical forces. Most of these washing processes are accompanied by intense agitation (such as with pressure spray, etc.), and the presence of a large number of bubbles not only affects the cleaning efficiency/fruit, but also makes the cleaning process impossible in many cases. A common example is that when you use the washing machine (especially the front-loading type) to wash the linen, if it is filled with a lot of foam, the stain removal power will be significantly reduced. The reason is that the foam reduces the impact of the water flow on the fabric and the mechanical forces such as friction between the fibers. If it is in the industrial cleaning process, the existence of a large number of bubbles in addition to affecting the decontamination force, is bound to increase the number of water/rinsing, and may also cause unnecessary loss of working fluid (such as in the form of overflow), increasing costs. In the operation with pressure spray, the foam can also cause pump damage. It is not difficult to imagine that in such operations, people often take low or even no bubbles as a necessary condition for detergent.
Defining a low-bubble surfactant is difficult. The main reason is that the formation and stability of bubbles are affected by many factors. These factors mainly have the following aspects: 1, the type of surfactant, 2, temperature, 3, water hardness, 4, the coexistence of components in the system - other surfactants, 5, acid and alkaline, etc. In other words, it is meaningless to discuss the foam behavior of surfactants in isolation from the actual conditions of use. Give an example. Fatty acid salts (the main active ingredient of soap) are multiple: in soft water, they belong to the high foam class; In hard water, it is often used as a defoamer. For the foam behavior of nonionic surfactants, the influence of temperature is even more important. Most widely used low-foam surfactants are included in this list. Their commonality is that when the temperature is below a certain range (generally below its turbidity point), there is a significant amount of foam, and the foam does not disappear quickly. However, when the temperature exceeds a certain value (generally above the cloud point), the number of bubbles is significantly reduced, and the stability has a "quality" change, and the newly generated foam is quickly generated at high temperature, and even bursts in an instant. Those situations where one side is produced and the other is burst instantly belong to the actual absence of bubbles. It is not difficult to see that the selection of low-foam surfactants needs to be combined with the actual conditions of use.