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Optical glass ultrasonic cleaning after polishing

Grinding is the production of optical glass to determine its processing efficiency and surface quality (appearance and precision) of an important process. Polishing step of main pollutants abrasive powder and asphalt, the processing of a few enterprises have paint chips. Wherein the abrasive powder of different models, and is usually an alkali metal ceria-based oxide. According to the lens material and precision grinding different, choose different types of abrasive powder. In the grinding process is used in the protective effect of asphalt to prevent a mirror polished finish is scratched or corrosion. Cleaning after grinding is broadly divided into two types: a primary cleaning agents using organic solvents, another major use of semi-water-based cleaning agent.

    Organic solvent cleaning using cleaning process is as follows:

Organic solvent cleaner (ultrasonic) - water-based cleaning agent (ultrasound) - City water rinse - water rinse-IPA (isopropyl alcohol) dehydration-IPA slow pull dry.
Organic solvent cleaning agents are mainly used for cleaning asphalt and paint chips. Previous solvent cleaning agents to use more trichloroethane or trichlorethylene. As trichloroethane is ODS (Ozone Depleting Substances) products, is forced out stage; while the long-term use of trichlorethylene easily lead to diseases, and because of trichlorethylene is very unstable, easily hydrolyzed acidic, so will corrode the lens and equipment. In this regard, domestic cleaning agent manufacturers to develop and produce a series of non-ODS solvent-based cleaning agents, can be used for cleaning of optical glass; And the series products have different physical and chemical indicators, which can effectively meet different requirements for equipment and process conditions. For example, in a small number of the production process, the lens surface with a layer of paint film difficult to handle, requires the use of an organic solvent with special solubility; some enterprises solvent cleaning tank cleaning equipment condenser less free path is short, requiring Volatile organic solvent with slower; another part of the business, by contrast, requires the use of rapid evaporation of the organic solvent.
Water-based cleaning agent of the main purpose is to clean the abrasive powder. As the alkali metal oxide abrasive powder, a solvent for its cleaning ability is weak, so the lens processing abrasive powder generated in the process is basically a water-based cleaning unit is removed, and therefore the water-based cleaning agent made a high requirement . Before the domestic optical glass special water-based cleaning agent fewer varieties, many foreign imports have chosen cleaning agent. The country has developed an optical glass cleaner, and successfully applied in several domestic large optical glass production plant, the cleaning effect can replace imported products, corrosive (corrosion resistance) and other indicators is better than imported products .
Slowly pull the IPA drying, a description is that certain types of lens watermark easily after drying, this phenomenon is on the one hand and IPA purity and air humidity on the other hand with the cleaning device has a greater relationship, in particular is significantly less than the effect of drying arms arm dry well, equipment manufacturers and users need to pay attention to this point.

    Semi-aqueous cleaning using cleaning process is as follows:

Semi-aqueous cleaning agent (ultrasound) - City water rinse - water-based cleaning agent - City water rinse - water rinse-IPA-IPA slowly pull dried dehydrated
Such cleaning process when compared with solvent cleaning biggest difference is that the front two cleaning units: Organic solvent cleaning asphalt or paint flakes only has a good cleaning effect, but it can not be cleaned abrasive powder and inorganic; semi-aqueous cleaning agents is different, not only organic contaminants can be cleaned and asphalt, also inorganic abrasive powder has a good cleaning effect, thereby greatly reducing the subsequent wash unit water-based cleaning agent for cleaning the pressure. Semi-aqueous cleaners are characterized by very slow evaporation, little odor. Semi-aqueous cleaners cleaning equipment in the first cleaning unit without sealing condensation and distillation recovery. However, semi-viscosity water-based cleaning agent, and the subsequent step using a water-based cleaning agents are emulsion, so the second element to city water rinse, and rinse water is preferable to set it.
Domestic application of this process of small enterprises, one of the reasons is a semi-aqueous cleaners are mostly imported, the price is more expensive.
From the water-based cleaning unit starts, semi-aqueous cleaning process is basically the same with the solvent cleaning process.

    Comparison of two kinds of cleaning methods

Solvent cleaning is a more traditional approach, the advantage of cleaning speed, more efficient, solvent itself can continue distillation regeneration, recycling; But the disadvantage is also obvious, since the optical glass production environment requires constant temperature and humidity, are closed workshop , solvent odor for how much will be some impact on the working environment, particularly the use of semiautomatic not closed cleaning equipment.
It is the conventional solvent cleaning improvement obtained on the basis of the past. It effectively avoids weaknesses solvent, can be non-toxic, odor mild, liquid can be discharged into the sewage treatment system; equipment supporting means less; solvent to be longer than the life cycle; running cost than the solvent lower. Semi-aqueous cleaners most prominent advantage is abrasive powder and inorganic contaminants for a good cleaning effect, greatly ease the follow-unit water-based cleaning agent cleaning pressure, extending the service life of water-based cleaning agent, reducing the The amount of water-based cleaning agent, reducing operating costs. Drawback is the cleaning solvent slower than the speed, and it must be rinsed.

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