Defoaming agent tips
During the industrial production process, a lot of harmful foam will be produced, which seriously hinders the production progress. At this time, it is necessary to add defoaming agents to eliminate these harmful foams. Defoaming agent is a substance with low surface tension and high surface activity that can inhibit or eliminate foam in the system.
The defoaming or foam-suppressing ability of defoaming agents is due to its very low surface tension that enters and destroys the bubble film, producing a defoaming effect. Therefore, defoaming agents are widely used and can be used to eliminate latex, textiles, etc. Harmful foam produced during the production process of sizing, coating, petrochemical, papermaking, industrial cleaning, food fermentation and other industries. When the defoaming agent is added to the foam medium, it falls on the surface of the foam, effectively reducing the surface tension at the contact point and creating a weak point on the outer skin of the foam, causing foam breakage.
Defoaming agents usually contain hydrophobic precipitated silica dispersed in mineral oil or silicone oil. In fact, the larger the particle size of the silica used as a defoamer, the easier it is to precipitate, especially in low-viscosity dispersions. Adding hydrophobic fumed silica can completely prevent or significantly reduce this settling process. The silanol groups in fumed silica are like many needles, piercing the bubbles, causing small bubbles to converge into large bubbles, overflowing the system, and achieving defoaming. In some defoaming systems, hydrophobic fumed silica can also be a silica component with defoaming effects. Fumed silica plays the role of thickening and anti-sedimentation in defoaming agents. More importantly, Enhance defoaming ability and improve foam suppression ability.
1. Synthetic rubber and resin industry fields
When using some latex synthetic gloves, because the main material uses fatty acid soap as an emulsifier, the foaming phenomenon will be more serious during use, especially after the action is completed, when the stripping reaction has not reacted When it comes to monomers, this phenomenon will be more serious, as bubbles are generated during the reaction of these complex chemical products. These bubbles not only greatly affect the production efficiency during the production process, but also cause waste of raw materials and products, prolong the reaction cycle of the product, and pollute the environment. Therefore, in some processes where foam is generated, To minimize or suppress this possibility, use defoaming agents. The use of defoaming agents in these rubber products can improve the stability of the product and improve the wear resistance of the product. Especially for some products that need to be dyed, it can improve the coloring.
2. Petroleum industry
Defoaming agents are also widely used in the country’s petrochemical industry. In the process of petroleum refining, especially in the process of crude oil distillation, the gas foam distilled out will affect the production efficiency of the product. The use of defoaming agents This will achieve high-efficiency continuous operation. At the same time, defoaming agents are also widely used in the textile industry!
