Environmentally-friendly phosphorus-free degreasing agent

Abstract

The invention discloses an environmentally-friendly phosphorus-free degreasing agent. The degreasing agent is prepared from the following raw materials in parts by weight: 3-5 parts of sodium carbonate, 2.25-3.75 parts of sodium silicate, 0.75-1.25 parts of sodium sulfate, 1.1-1.8 parts of sodium hydroxide, 0.5-0.83 part of polyvinylpyrrolidone, 0.5-0.8 part of a compound nonionic surfactant, 0.5-0.8 part of a self-defoaming emulsifier and 2.4-3.6 parts of an organic metal chelating agent. The degreasing agent has the advantages that the phosphorus and nitrogen emission problems are avoided, the cost is low, the grease wettability is good, the hard water softening capabilityis achieved, the degreasing agent is combined with metal ions in oil stains so as to generate a chelate capable of being dissolved in water, the surface tension is low, the interfacial activity of a cleaning agent solution is greatly improved, and the cleaning effect is greatly improved.

Description

technical field [0001] The invention relates to the field of metal treatment, in particular to an environmentally friendly phosphorus-free degreasing agent. Background technique [0002] In the treatment process of galvanizing and color coating of metal materials, the degreasing process is a very important link, which is used to remove various oil stains such as processing lubricating oil and anti-rust oil on the metal surface, so as to prevent oil stains from hindering the formation of phosphating film And affect the adhesion and corrosion resistance of the coating. [0003] Traditional degreasing agents mainly use polyphosphate, which can not only soften hard water, but also capture various metal components contained in the dirt, so that the dirt can be dissociated during the washing process, thereby improving the washing performance. However, due to the disadvantage of eutrophication, the phosphorus-containing wastewater discharged by polyphosphate degreasing agents will...

AI Technical Summary

Problems solved by technology

However, due to the disadvantage of eutrophication, the phosphorus-containing wastewater discharged by polyphosphate degreasing agents will cause eutrophication of the water body, which will have serious adverse effects on the environment and do not meet people's increasingly stringent requirements for environmental protection. Phosphorus-free degreasing agents on the market do not contain phosphorus in the formula, but the degreasing rate is low, and the process steps need to be repeated, resulting in low production efficiency