Surfactant is used as cleaning agent in cleaning solution

2022-10-12 20:40:34

The application principle of surfactant in water-based metal cleaning agent is to weaken or offset the adhesion of oil stain on metal surface through the properties of surfactant such as wetting, penetration, emulsification, dispersion and solubilization, and accelerate the oil stain to leave the metal surface by mechanical and physical methods and enter the washing solution to be emulsified, dispersed and suspended or solubilized in micelles.

Surfactant is used as the cleaning agent in the cleaning solution to reduce the interfacial tension between the cleaning solution and the dirt. The cleaning solution can first wet the dirt surface to make the dirt swell, and then penetrate into the dirt to disperse the dirt. If the dirt belongs to oil, the grease will first form a ball and gather on the metal surface, and the surfactant will squeeze in to separate the dirt from the metal surface and move it to the cleaning solution. The originally insoluble oil particles are surrounded in the surfactant micelle and "solubilized" in the cleaning solution, and will not be adsorbed on the metal surface again. When washing, if there is mechanical force, it will help the dirt to separate from the metal surface and improve the cleaning effect. In addition to the cleaning effect of the above cleaning agent, the emulsion prepared from the surfactant also has the similar solvent dissolution principle. The existence of the internal oil phase will greatly enhance its dissolution and cleaning effect on oil contamination. The ideal cleaning emulsion generally has the following four characteristics:

(1) The emulsion is stable, and the oil has strong solubility relative to oil contamination.

(2) The oil phase has low viscosity and is easy to be washed by water.

(3) The oil phase is good, non volatile, non-toxic, and the cleaning process will not produce pollution.

(4) It is easy to demulsify and recycle.

Inorganic additives such as corrosion inhibitor, cosolvent, foam stabilizer, defoamer and filler shall also be added when cleaning with water-based metal.

Formula: Nonylphenol polyvinyl chloride (20) ether 80% oleic acid 8% triacetic acid amine 8% boric acid triacetic acid amide 8% monobutyl acetate 8% silicone defoamer 0.2% water margin When used, dilute to 5% Note: the above percentage is the mass ratio.

A large amount of acid mist will be produced in the pickling process, which will not only affect the health of workers, but also pollute the environment. At the same time, it will also corrode the plant and equipment. In order to improve the rust removal effect of acid pickling and prevent acid over corrosion, surfactants are added to sulfuric acid or hydrochloric acid in the acid pickling solution to inhibit acid mist, accelerate the acid pickling speed and prevent the occurrence of over corrosion.