Phosphorus-free foam-free low-temperature steel plate surface cleaning agent and preparation method thereof

Abstract

The invention discloses a phosphorus-free foam-free low-temperature steel plate surface cleaning agent and a preparation method thereof and is applied to production of coating steel plates. The cleaning agent comprises the following chemical components: 5-30 percent of sodium hydroxide, 5-30 percent of sodium carbonate, 3-15 percent of sodium silicate, 0.5-3 percent of chelating agent, 1-10 percent of anionic surfactant, 0.1-1 percent of full-mixture block polyether nonionic surfactant, 0.1-2 percent of silicone oil and 50-75 percent of water. The preparation method comprises the following steps of: adding sodium hydroxide into a small amount of water, adding the chelating agent, and uniformly stirring; adding water, keeping the temperature to be 20-30 DEG C, sequentially adding sodium carbonate and sodium silicate, and stirring until the mixture is dissolved; adding the anionic surfactant, the full-mixture block polyether nonionic surfactant and the silicone oil, and stirring until the mixture is dissolved; and finally adding water and uniformly stirring. Multiple surfactants are used for compounding, so that the cleaning agent can be adsorbed to the surface of a cold-rolled steel plate, an ideal emulsifier is formed, the tension of an oil-water interface is reduced, the contact area is increased, and multiple effects of defoaming, permeating and cleaning are simultaneously realized.

Description

technical field [0001] The invention relates to a cleaning agent and a preparation method thereof, in particular to a phosphorus-free and foam-free low-temperature type steel plate surface cleaner and a preparation method thereof. Background technique [0002] During the production, transportation and storage of cold-rolled steel sheets, various emulsions and anti-rust oils are required. At the same time, some other pollutants, such as iron powder, dust, fingerprints, etc., may be stuck on during the processing. In the production process of color-coated steel plates, the oil, rust, dust and other pollutants attached to the steel plate must be removed before painting, which is the key to ensure the quality of the subsequent process and coating quality. The current steel plate surface cleaner requires high cleaning temperature, and has disadvantages such as poor anti-corrosion and anti-rust performance, and generation of air bubbles. Its production cost is also higher, does n...

AI Technical Summary

Problems solved by technology

Chinese Patent Publication (Announcement) No.: CN 102330102A discloses a phosphorus-free metal surface degreasing agent and its manufacturing method. The degreasing agent has high degreasing efficiency, but has disadvantages such as bubble generation or poor biodegradability during operation.