Usage and use of optical glass cleaner
Optical glass cleaner is mainly formulated by a variety of organics, surfactants, inorganic salts and other scientific processes. It is mainly used to clean the dirt, dust and fingerprints on the surface of various optical glass lens coatings. , Oil stains, polishing powder and other residues. The role of optical glass cleaning agent: the cleaning of optical glass after grinding mainly uses organic solvent cleaning agent and water-based cleaning agent. (1) The cleaning process used in organic solvent cleaning Organic solvent cleaner (ultrasonic)-water-based cleaner (ultrasonic)-municipal water rinsing-pure water rinsing-IPA (isopropyl alcohol) dehydration-IPA slow pull drying. The main purpose of organic solvent cleaning agent is to clean asphalt and paint flakes. The previous solvent cleaning agents mostly used trichloroethane or trichloroethylene. Since trichloroethane is an ODS (ozone depleting substance) product, it is currently in the phase of mandatory phase-out; long-term use of trichloroethylene can easily lead to occupational diseases, and because trichloroethylene is very unstable, it is easy to hydrolyze and become acidic, so it will corrode lenses and equipment . In this regard, our company has developed a series of non-ODS solvent-based cleaning agents that can be used to clean optical glass; and this series of products have different physical and chemical indicators, which can effectively meet the requirements of different equipment and process conditions. For example, in the production process of a small number of companies, there is a layer of paint on the surface of the lens that is difficult to handle, requiring the use of organic solvents with special solubility; some companies have fewer solvent cleaning tanks in the cleaning equipment, and the free path is very short. Use organic solvents that evaporate slowly; on the contrary, some companies require the use of organic solvents that evaporate quickly. (2) The main purpose of the water-based cleaner is to clean the abrasive powder. Since the abrasive powder is an alkali metal oxide, the solvent is very weak in its cleaning ability, so the abrasive powder produced during the lens processing is basically removed in the water-based cleaning unit Therefore, extremely high requirements are placed on water-based cleaners. In the past, because there were few types of water-based cleaning agents dedicated to optical glass in China, many foreign-funded enterprises chose imported cleaning agents. At present, domestic companies have developed optical glass cleaning agents and successfully applied them in several large-scale optical glass manufacturing plants in China. The cleaning effect can completely replace imported products, and it is better than imported products in terms of corrosiveness (corrosion resistance) and other indicators. product. Regarding the slow-draw drying of IPA, it should be noted that certain types of lenses are prone to produce watermarks after drying. On the one hand, this phenomenon is related to the purity of IPA and air humidity, and on the other hand, it has a greater relationship with cleaning equipment, especially The effect of double-arm drying is obviously not as good as that of single-arm drying, which requires equipment manufacturers and users to pay attention to this point.
China Glass Network (www.glass.cn) News Editorial Department