Industry Knowledge Analysis Laundry Powder Formulation Surfactant - Surface Active Tension

During the washing process, the fabric, soil and laundry detergent formula form a basic washing system. If you don't have washing powder, you can't talk about washing. The quality of washing powder technology determines the quality of washing to a large extent. Therefore, if you want to wash fabrics well, you should have a deep understanding of the physical chemistry of washing powder and the composition of washing powder. Nominal active agent is an important ingredient in washing powder. Various functions expressed by washing powder, such as wetting, emulsification, foaming, evacuation, and washing, are related to the role of nominal active agent. Therefore, to understand washing powder, we must first understand Nominal active agent. There are all kinds of interfaces in life. When water is added to the oil, an interface is formed between the water and the oil; when the fabric is washed, an interface is formed between the fabric and the washing liquid, and between the washing liquid and the air. But conventionally we call the interface formed by a liquid or solid and air a nominal. Because the interface is formed by two different phases. Therefore, the forces on the molecules at the interface are different from those in the two phases. For example: when there is water in the cup, the force on the water molecules in the liquid is yes, but the molecules on the water-air interface, because of the difference in the properties of water and air, the force on the water molecules in the liquid is different. . The molecules of the liquid phase are more attracted to it than the molecules of the gas phase, so the immortalized nominal molecules are subject to a downward gravitational pull from the interior of the liquid phase. This makes the nominal molecule weak, with a tendency to migrate into the liquid and actively shrink. The nominal compressive force of this liquid, we call the nominal tension. The force between the interfaces is called interfacial tension. The existence of nominal tension reduces the interface area as much as possible, which is the reason why the water droplets always become spherical under the action of external force (spherical nominal product). The magnitude of the nominal (interfacial) tension reflects the difference in the properties of the two phases at the interface. The greater the difference in the properties of the two phases, the greater the nominal tension. The properties of water and air are very different, and there is a large nominal tension, which is unfavorable for decontamination, and it is necessary to add chemicals to reduce the nominal tension of water. And organic solvents, such as tetrachloroethylene, a solvent used for dry cleaning, have a much smaller nominal tension than water, and are very effective in removing oil stains.
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