The cleaning agents used in ultrasonic cleaning machines are mostly liquid detergents, composed of surfactants, additives, and other organic solvents such as trichloroethylene.

A substance that can significantly reduce the surface tension between water and air, or the interfacial tension between water and other substances, even when dissolved in water at a low concentration, is called a surfactant. The molecular structure of water-soluble surfactants has the characteristic of asymmetric polarity.

Adsorption on the interface between aqueous solution and other phases greatly changes the physical properties of the system, especially the interfacial tension between the phases.

According to the electrical properties exhibited by hydrophilic groups when surfactants dissolve in water, surfactants can be classified into anionic, cationic, neutral, and amphoteric surfactants.

Chelating agents and certain metal ions in the solution, such as Ca2 Mg2 , form stable chelates, which give detergents the ability to resist hard water. Specifically, during lens cleaning, they can also combine with certain Ca2 - Mg2 substances on the surface of the lens to achieve the cleaning effect.

The addition of certain additives has the following effects:

Buffer effect: to maintain the pH value of the detergent stable.

Corrosion resistance of metals.

Can increase the emulsifying ability and emulsifying stability of detergents.

It can make the solution have good suspension ability and stable suspension system, which can prevent dirt from settling again.

The selection principle of surfactants, chelating agents, and additives on the surface: 1. The detergent composed of them has strong cleaning ability; 2. Soft chemical properties that do not damage the laundry; No chemical reaction occurs between the three components, resulting in component failure; 4 has good floatability.

The temperature and concentration for preparing detergent should be determined through specific experiments. The function of trichloroethylene is to achieve cleaning by dissolving the adhesive, wax, and asphalt on it

Ultrasonic cleaning process

Different processes in optical lens processing should have different cleaning techniques. From the overall process, it can be divided into four processes: washing, rinsing, dehydration, and drying.

Washing mainly uses organic solvents such as trichloroethylene to highly dissolve upper plate glue, wax, mold inhibitors, etc. to achieve the purpose of pre washing, and then uses detergent to wet, penetrate, and emulsify the surface of the lens to achieve a comprehensive cleaning effect.

Rinsing, by rinsing the surface of the lens with clean water and applying ultrasound, causes the detergent that has become loose on the surface of the lens after washing to detach from the surface of the lens.

Dehydration: After rinsing, the surface of the lens contains a large amount of water, which enters the dehydrating agent for dehydration. The dehydrating agent is mostly an organic solvent that can mix well with water.

The drying agent should have a boiling point similar to that of the dehydrating agent and good solubility. The drying process is roughly as follows: 1. The desiccant vapor condenses into a liquid on the surface of the lens; Two desiccants form an azeotrope with the dehydrating agent on the surface of the lens; 3. Local azeotropes form steam and leave the surface of the lens;

A local azeotrope flows through the surface of the lens in a liquid state, which has a flushing effect on the lens. After these processes, the surface of the lens is made clean and dry.

Due to the use of organic solvents as dehydrators and desiccants, which have varying degrees of impact on the environment and operators, modern ultrasonic cleaning technology has improved the drying process to prevent these effects. Pure water is used for rinsing, while dehydration is omitted. After rinsing, the surface of the lens is in a pure water state, which is then dried by filtered hot air. This not only quickly and effectively dries the lens, but also prevents the impact of organic solvents on the environment and operators.

Article source: Jiangmen Ultrasonic Cleaning Machine http://www.kpzfcsb.com/