Laboratory cleaning related programs for your reference.

1. Reliable water source

Some chemical experiments are very sensitive to the impact of ions, and the requirements for water quality are particularly high. At this time, we are required to obtain a very reliable water source. Most laboratories will have a pure water machine to produce water for the laboratory to clean test tubes and flasks and provide reliable deionized water sources for experiments. At this time, it is particularly important to select a reliable water machine.

2. Mechanical cleaning method

When there are a large number of bottles and cans to be washed in the laboratory, the bottle washing machine comes into use. The bottle washing machine is flushed by Mechanical flushing method.

The advantages of the bottle washing machine are:

Can safely use strong alkaline liquid lotion, hands do not touch the lotion, will not cause hand dryness

The cleaning is uniform and very worry free.

It can be washed with hot water (max.80 ℃) to reduce the cleaning cost

Rinsing with 93 ℃ hot water can play a disinfection role

Save time

Can be cleaned in large quantities

Don't worry about glass scratches

Automatic drying function can be selected to avoid the drying process in the drying oven

3. Chemical immersion method

The first thing we think of is the neutralization reaction of various reagents in the laboratory to react the products on the wall of the test tube. Some time ago, we came into contact with a detergent called oxygen bubble fresh oxygen particles in our life. It works well when washing test tubes in the laboratory. It is recommended to try it.

Fresh oxygen granules are composed of SPC, food grade sodium peroxycarbonate and food soda. Oxygen bubble is a kind of "chemical process", that is, oxygen is used to decompose stains into water-soluble small molecules, use the power of oxygen to remove stains, deodorize and sterilize, and finally decompose into soda, oxygen and water. It is healthy and environmentally friendly, and it is taken from nature and returned to nature.

4. Ultrasonic cleaning method

The high-frequency vibration signal sent by the ultrasonic cleaner is converted into high-frequency mechanical vibration by the transducer, so that it is dispersed in the cleaning liquid, causing the liquid to flow and generating tens of thousands of tiny bubbles. These bubbles form and grow in the negative pressure area formed during the ultrasonic propagation, and quickly close in the positive pressure area. This process can produce an instantaneous high pressure of more than 1000 atmospheres and is continuous, which is called "cavitation effect". It is like a series of explosions, which constantly impact the surface of the object and the gap, so as to achieve a comprehensive cleaning effect.

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5. Plasma cleaning

Plasma cleaning is another cleaning method different from the above cleaning methods. It can not only achieve cleaning effect, but also have certain chemical modification function. The following is a detailed introduction.

The vacuum plasma cleaning system consists of a plasma cleaning machine and a vacuum pump. The plasma in the plasma cleaner is an existing state of matter, also known as the fourth state (usually the matter exists in three states of solid, liquid and gas), such as the matter in the ionosphere of the earth's atmosphere. The following substances exist in the plasma state: electrons in high-speed motion; Neutral atoms, molecules and atomic groups (free radicals) in the activated state; Ionized atoms and molecules; Unreacted molecules, atoms, etc., but the substance remains electrically neutral as a whole.

In the vacuum chamber, the RF power supply emits glow under a certain pressure to generate high-energy disordered plasma, which bombards the cleaned product surface to achieve the purpose of "cleaning".

1、 Working principle

1. Activation bond energy crosslinking

The particle energy in the plasma is 0 ~ 20ev, while most of the bond energy in the polymer is 0 ~ 10ev. Therefore, after the plasma acts on the solid surface, the original chemical bonds on the solid surface can be broken. The free radicals in the plasma form a network cross-linking structure with these bonds, which greatly activates the surface activity.

2. Bombardment on material surface - physical effect

It mainly uses a large number of ions, excited molecules, free radicals and other active particles in the plasma for pure physical impact to knock off the atoms on the surface of the material or the atoms attached to the surface of the material, which not only removes the original pollutants and impurities on the surface, but also produces etching, roughens the surface of the sample, forms many micro pits, increases the specific surface area of the sample, and improves the wettability of the solid surface. Since the average free radicals of ions are light and long when the pressure is low, the energy is accumulated. Therefore, the higher the energy of ions is, the more energy will be used for impact. Therefore, if the physical action is the main one, the reaction must be carried out at a lower pressure, so that the cleaning effect is better.

3. Forming new functional groups -- chemical action

Chemical reaction: the reaction mechanism is mainly to use the free radicals in the plasma to make chemical reaction with the surface of the material. When the pressure is high, it is more favorable for the generation of free radicals. Therefore, if the chemical reaction is the main one, it is necessary to control the high pressure to carry out the reaction.

The commonly used gases in the chemical reaction are hydrogen (H2), oxygen (O2), methane (CF4), etc. these gases react into highly active free radicals in the plasma cleaner. If reactive gases are introduced, complex chemical reactions will occur on the surface of the activated material, and new functional groups such as hydrocarbon, amino, carboxyl, etc. will be introduced. These functional groups are active groups, which can significantly improve the surface activity of the material.

2、 Four applications

1. Cleaning

The surface of the process component is cleaned by the physical bombardment of the plasma beam, and the surface can also react with the specific gas to be converted into the gas phase by the cleaning process and discharged.

A application: remove grease, oil, oxide and fiber; Removing the silicone resin; Pretreatment before binding, welding and bonding; Pretreatment of metal parts before coating.

B applicable parts: almost all materials can be precisely cleaned by plasma, and typical are electronic components; Rubber metal connector; Switch; Sensors; Medical implants; Small parts; O-ring; Helix; Laser components.

2. Surface activation

Oxygen or air can be introduced into the plasma chamber to activate the surface of the cleaning part, and oxygen atom groups will be formed on the surface of the material to enhance the adhesion and bonding force of the surface.

A application: pretreatment before bonding; Pretreatment before coating; Pretreatment before printing.

B applicable parts: almost all materials can be activated by plasma, typically with sensors; Semiconductor materials; Catheter; Headlamp reflector; Rubber; Aluminum coating; Graphite film.

3. Etching

The excited process gas on the surface of the component is etched. Through plasma sputtering and bombardment, the surface material is peeled off, transformed into gas phase and discharged. In this way, the specific surface area of the material surface is increased and wetted. The etching effect is applied to the pretreatment before printing, bonding and coating and to roughen the material.

A application: silicon etching; PTFE etching; Improve the adhesion of high temperature resistant plastics to coatings and adhesives, such as PTFE, FPA, FEP; Remove the photoresist.

B applicable parts: plastic; semiconductor; Glass; Remove the component package; medical apparatus and instruments; Circuit board.

4. Coating

In the plasma polymerization reaction, the components are introduced into the plasma reaction chamber, and the plasma atomizes the gas and precipitates it on the surface of the process components.

A application: deposition of hydrophobic layer; Deposition of hydrophilic layer; Deposition of protective or insulating layers; Anti diffusion layer.

B applicable parts: all industrial materials; Typically metal; Glass; Ceramic.