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What causes defoamer-induced oil floating and whitening?
Release Date:
2023-05-23
Using defoamers to bleach oil is a highly problematic issue, as it often indicates poor defoamer quality and can lead to adverse effects in severe cases. Many customers adopt a straightforward approach: assessing whether the defoamer used for oil bleaching is excessively aggressive. Accordingly, the following section summarizes several methods employed by silicone‑based defoamer manufacturers to determine if a defoamer will cause oil bleaching.
Using defoamers to bleach oil is a highly problematic issue, as it often indicates poor defoamer quality and can lead to adverse effects in severe cases. Many customers adopt a straightforward approach: assessing whether the defoamer used for oil bleaching is excessively aggressive. Accordingly, the following section summarizes several methods employed by silicone‑based defoamer manufacturers to determine if a defoamer will cause oil bleaching.
Method for determining the original solution of the defoamer
Method 1: Observe the original solution of the defoamer to make a determination.
To determine whether a defoamer will cause oil floating, first examine the defoamer’s undiluted solution. Here’s how to proceed: Pour the solution into a wide‑mouth, shallow container, adding enough to fully cover the surface. Then, hold the container in your hand and position it against different light sources. If you’re indoors, choose a well‑lit direction—ideally with an electric lamp—so that light shines from both the front and above onto the defoamer’s surface. Observe the reflections as they reach your eyes. By repeatedly adjusting the angle and observing from various perspectives, you can clearly assess the defoamer’s level and gain a more precise understanding of its condition.
If the defoamer exhibits oil floating, bright, distinct oil spots can be observed on the liquid surface, indicating poor quality. However, if only small amounts of floating oil are present and not readily visible, additional methods will be required for further assessment.
Method 2: Observe the diluent of the defoamer.
First, dilute the defoamer to a specified mass concentration, then observe whether oil floating occurs when using the diluted solution. Based on this approach, we can conclude that Method One is not suitable for evaluating the performance of the defoamer product. A practical alternative is to prepare a 1%‑concentration defoamer solution and assess it using analytical method one.
If a small oil slick is visible at the diluted solution’s surface, we can analyze and conclude that this floating phenomenon is not observed in the undiluted solution.
Method 3: Observe the defoaming agent’s dilution performance at the specified temperature.
Please note the diluent for the defoamer at its actual operating temperature, as some defoamers do not cause discoloration of the oil when diluted; instead, discoloration occurs only at the service temperature. Specific procedure: If the ambient operating temperature is higher than room temperature, heat the defoamer diluent to the desired temperature before proceeding with Method 1.
Method 4: Observe defoamer dilutions at different concentrations.
The degree of oil‑floating varies significantly with different dilution ratios. Generally, highly concentrated defoaming diluents tend to cause noticeable discoloration, whereas low‑concentration formulations are less prone to oil‑floating and may not even result in bleaching.
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