Types of Dirt on the Surface of Optical Glass Components

Types of dirt on the surface of optical glass components

Cleaning agent for optical glass elements. The traditional method often uses organic solvents such as ethanol, ether, isopropanol, trichloroethylene, CFC-11, etc. Not only are they expensive, but they are also toxic and flammable, posing safety hazard to operators and the environment. They can cause the destruction of the ozone layer and are not suitable for cleaning large quantities of optical elements. Using water-soluble cleaning with surfactants and auxiliaries as the main components to replace organic solvents for different cold processing production processes of optical elements and for cleaning optical elements before assembling optical, not only can reduce production costs and adapt to large-scale machine washing, but also have significant implications for environmental protection and personal safety.The production of optical elements is relatively complex cold processing process. The required auxiliary materials are diverse (asphalt, shellac, diamond sand, cesium oxide, hot melt adhesive, cutting fluid, edge grinding, organic solvents, protective coatings, etc.). It has to go through several different processing steps (including cleaning) before a piece of optical element production work can be.

1. Sources and classification of dirt on the surface of optical elements1. Analysis of the source of dirt

(1) During the cold processing of element, there are still residues of abrasive (CeO2), coolant (tap water, etc.), auxiliary materials (wax, asphalt,ac, etc. protective paint), and organic solvents (gasoline) after the lower disk cleaning;

(2) During the process flow, fingerprints, sal prints, and sweat prints that may be caused by the operator's contact;

(3) During storage, dust, carbon dioxide, temperature, etc. in the air "corrosion" on the surface of the element.The above dirt often does not exist alone, but permeates each other. It will also oxidize and decom or deteriorate due to microbial action, forming more complex chemical substances that adhere to the surface of the element, and even corrode the surface of the element, forming difficult--remove spots.

2. Classification of dirt

(1) Organic dirtSuch as wax, asphalt, shellac, sweat stains, fingerprints, prints, etc., which are adsorbed on the surface of the element due to van der Waals force (molecular attraction). Its characteristics are insoluble in water but soluble in some alcohols, ethers: hydrocarbon organic solvents, and can also be emulsified and dispersed by the aqueous solution of the cleaning.(2) Solid dirtSuch as dust, soot, abrasive, residue, etc. The particles of its stains are very small, and the are generally negatively charged, but still mainly adsorbed on the surface of the element by van der Waals force, or mixed with oil and water and adhere to the surface of element. Its characteristics are insoluble in water and organic solvents, but can be adsorbed by the active molecules of the cleaning agent, so that the particles are dispersed colloidally dissolved, and suspended in water.

(3) Water-soluble dirtSuch as saliva, water marks, etc., which come fromions of the human body. Its characteristics are generally soluble in water, but can react with the surface of the element. It combines with the surface of the element through a chemical to form corrosive "spots". This requires that the reactant remove it through chemical methods.