Classification Of Cleaning Agents
Water was the most important cleaning agent, role and status of any other cleaning agents can not be replaced. Plain water is easy to get from nature, water is a strong solvent and dispersion forces. But water's surface tension, surfactant is needed in use, to reduce surface tension, increase surface wettability. In the general industrial cleaning, acid, alkali and water, combined with the more common, some metal wash to join rust; in the precision and high precision industrial cleaning. Most requests will be made from purified water. Usually measured in resistivity of water purity. Requirements of the semiconductor industry in 18M/cm or more. 10M/cm to TN-LCD production, there are very strict standards for bacteria.
Half water-based cleaning agent, also called water-based cleaning agent, is made up of high-boiling solvents and surfactants, such as alcohols, organic hydrocarbons, etc. Usually contains a 5% a 20% of water, nonflammable, but heating water when cleaning the content control, which may cause burning. Half water-based cleaning with solvents to wash some different, its cleaning is peeling removes, rather than dissolved. In order to prevent peeling of oil to be on cleaning, cleaning fluid to continuously cycle and increasing oil-water separator. Semi-washed cleaning effect is usually very good, but the operating cost is higher, waste not recycling, re-use, with COD (chemical oxygen demand) higher, the need for wastewater treatment.
Solvent-based cleaning agents is not soluble in water and organic solvents. Precision industrial cleaning uses non-water cleaning agent is mainly hydrocarbons (petroleum), chlorinated hydrocarbons, fluorinated hydrocarbons, brominated hydrocarbons, alcohols, organic solvents such as silicone oils, terpene.