What are the factors that affect the defoaming effect of defoaming agents?
Defoaming agents are widely used and their products are used in various industries. Today we will mainly introduce to you how to use defoaming agents for textile dyeing.
First dilute it with water 1:30 times and then add it. The dosage is 0.1%-0.5%. An appropriate amount of defoaming agent can effectively prevent and eliminate foam. Do not use too much. Stir properly before use, and dilute the solution with the required defoaming agent with water or thickened water before use. The defoaming agent should be added before the foaming liquid is foamed, so as to prevent and eliminate foam more effectively.
Defoaming agents are divided into oil-based and water-based defoaming agents. Different defoaming agents are used in different industries.
Applicable pH range of defoaming agent. Strong acid and alkali environments have strict requirements on defoaming agents. This requires explaining the carrier environment to the defoaming agent manufacturer.
Consider the long-term effectiveness of defoaming agents. Some defoaming agents start out very well, but become much less effective after being left for a while.
There are many factors that affect defoaming agents, there are at least two reasons:
1) The defoaming agent is compatibilized by the surfactant,
2) The main defoaming agent can be absorbed by the colloidal resin.
Defoaming ability under static conditions. When the liquid that generates bubbles flows back into the storage tank or directly into the packaging barrel, it can be defoamed quickly.
Defoaming ability of defoaming agents under dynamic conditions
1) Dynamic defoaming effect in a relatively closed small space. Because it involves gas entering the bubble, the external air pressure decreases in a short period of time, which is more conducive to the generation and stability of the bubble. Wetting agents and emulsifiers have a shrinking effect on the gas in the bubbles. One is nothing, but tens of thousands or hundreds of millions can be considerable.
2) To activate the dynamic defoaming effect, the sheet-fed flexo printing machine does not have the glazing machine. The small space of the upper rubber roller and the inking roller is exposed and rotates at a high speed, causing bubbles to be generated very quickly.
Computer suitability
1) Temperature. Temperature changes lead to changes in surfactant foam stabilization and defoaming.
2) Customer habits.
The defoaming agent passed the test in the factory, but failed once it arrived at the customer’s place. We were puzzled. After seeing it on site, we understood that it turned out that the customer was diluting the defoamer too much. For the same dilution, the decrease in foam stabilization of emulsifiers and wetting agents is inconsistent with the decrease in defoaming ability of defoamer.
