What are the factors that affect the defoaming effect of defoamers?
Defoaming agent is widely used, and its products are applied in various industries. Today we mainly introduce the use of defoaming agent for textile dyeing. First, dilute it with water 1:30 times and then add it. The addition amount is 0.1%-0.5%. The right amount of defoaming agent can effectively prevent and eliminate foam. Do not use excessive amount. Stir it properly before use, and dilute the solution with water or thickening water to be added before use. The defoaming agent should be added before the foaming liquid is foamed, so that it can more effectively prevent and eliminate foam. Defoaming agents are divided into oily and water-based, and different defoaming agents are used in different industries. Applicable PH range of defoaming agents. Strong acid and strong alkali environments have more stringent requirements on defoaming agents, which requires the defoaming agent manufacturer to explain the carrier environment. The long-term effectiveness of the defoaming agent should be considered. Some defoaming agents are very good at the beginning, but the effect is much worse after being placed for a period of time. There are many factors that affect defoamers, at least two reasons: 1) Defoamers are expanded by surfactants, 2) Defoamer main agent can be absorbed by colloidal resin. Defoaming ability in static conditions. When the liquid that generates bubbles flows back into the storage tank or directly into the packaging barrel, it is OK if the defoaming is fast. Defoaming ability of defoamers in dynamic conditions 1) Dynamic defoaming effect in a relatively closed small space. Because it involves gas entering the bubbles, the external air pressure is reduced in a short time, which is more conducive to the generation and stability of bubbles. Wetting agents and emulsifiers have a shrinking effect on the gas in the bubbles. One is nothing, but tens of millions are considerable. 2) Open dynamic defoaming effect, which is not available when a single flexographic printing machine is converted into a coating machine. The narrow space of the coating roller and the inking roller is open and flipped at high speed, and the bubble generation speed is quite fast. Applicability to the machine 1) Temperature. Temperature changes lead to changes in surfactant foam stabilization and defoaming. 2) Customer habits.
The defoamer passed all the tests in the factory, but failed when it arrived at the customer’s place. We were puzzled. After visiting the site, we understood that it was because the customer diluted it too much. For the same dilution, the decrease in the foam stability of the emulsifier and wetting agent is inconsistent with the decrease in the defoaming ability of the defoamer.
Product application:
Polyester fiber, high and medium temperature dyeing, high temperature overflow dyeing, jet dyeing, high temperature dyeing of polyester fabrics, water treatment for polyester-cotton textile dyeing process, textile auxiliaries, bleaching, sizing, etc.
