How to dilute silicone defoamer?

How to dilute silicone defoamer?

Ø  Raw Material

Silicone defoamer 200g

Clean water (deionized water, tap water) 768g

Thickener 30g (3.0% of total defoamer)

Preservative 2g (0.2% of total defoamer)

Appropriate amount of alkaline water (10% NAOH solution)

Ø  Steps

1. Add 30g of thickener to 768g of water, add 30g of thickener, stir for 5min, add 2g of preservative, and carefully adjust the pH of the above thickener aqueous solution with alkaline water (10% NAOH solution) Adjust to 7.0~7.5 (preferably 7.5). Note that when the aqueous solution gradually becomes clear from the light milky white, the viscosity also increases, and the alkaline water needs to be added very slowly;

2. Add 200g of silicone defoamer to the above prepared thickened water, stir evenly, and measure whether the pH value is between 7.0~7.5. After passing the test, it can be discharged.

Ø  Note

1. In this method, the concentration of the thickener is 3.0%. If you feel the final product viscosity is low, you can increase the thickener concentration (such as increased to 3.5%, 4% or higher) and vice versa. However, it should not be less than 1.5%, and it should not be diluted directly with water. Otherwise, the diluted defoamer is unstable and easy to stratify, demulsifie and float.

2. When mixing and mixing, the stirring speed should not be too fast. It is recommended that the rotation speed should not exceed 60 rpm. Generally, the mixture can be sampled for 5 minutes to observe whether there are obvious doughs and avoid stirring for a long time.

3. It is recommended to carry out pre-sterilization treatment on the clean water source (such as tap water and deionized water), such as adding 5~10ppm of strong chlorin.

4. The above method is only applicable to our silicone defoamer. Whether it is also applicable to other company products, there is no guarantee that customers can experiment and judge by themselves according to this method.

5. Our company is not responsible for the adverse consequences of qualified products due to improper dilution (such as: decreased stability, decreased foaming performance, bleaching, demulsification, delamination, mildew, etc.).
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