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Three anti-paint coating process parameters and equipment selection

Date: 2016/9/17 21:46

The thickness of the three anti-paint paint should be different: different paints have different requirements. If the machine paint process is used, the recommended temperature is 20-70um. Baking temperature: 80 degrees or less (the actual heating temperature of the product) The setting temperature of the curing furnace should be less than 120


Tri-proof paint is a specially formulated coating to protect circuit boards and related equipment from environmental erosion. The three-proof paint has good high and low temperature resistance properties; after curing, it forms a transparent protective film, which has superior insulation, moisture resistance, leakage resistance, shock resistance, dust resistance, corrosion resistance, aging resistance, and corona resistance.


Three anti-paints are called according to the requirements and emphasis of each region and manufacturer, such as three anti-adhesives, moisture-proof adhesives, insulating adhesives, moisture-proof paints, protective paints, protective paints, coating adhesives, coating adhesive , Waterproof glue, moisture-proof oil, three-proof oil, three-proof agent, protective agent, moisture-proof agent, conformal coating, conformal coating, conformal coating, common coating, English name Conformal Coating. Tri-proof paint is a specially formulated paint that is used to protect circuit boards and related equipment from the environment, thereby increasing and extending their service life and ensuring the safety and reliability of use.

Under realistic conditions, such as chemical, vibration, high dust, salt spray, humidity, and high temperature, the circuit board may produce problems such as corrosion, softening, deformation, mildew, etc., causing the circuit board circuit to malfunction. The three-proof paint is applied on the surface of the circuit board to form a three-proof protective film (three-proof refers to moisture, salt spray, and mildew). In the case of chemical substances (such as fuel, coolant, etc.), vibration, humidity, salt spray, humidity and high temperature, the circuit board without the three-proof paint may be corroded, mold growth and short circuit, etc. In the event of a failure, the use of three-proof paint can protect the circuit from damage, thereby improving the reliability of the circuit board, increasing its safety factor, and ensuring its service life. In addition, the rugged paint prevents leakage, which allows higher power and closer printed board spacing. Therefore, the purpose of miniaturizing the components can be satisfied.





Main application areas:

1. Civil and commercial applications Tri-proof paint can provide protection for electronic circuits in household appliances, so that they can resist: such as: water, moisture, insects, harmful substances in offices and homes. Such as: Soymilk machines, coffee machines, induction cookers, dryers, dishwashers, air conditioners, computers, bathroom electronics, electric cars, etc.


2. The automobile industry The automobile industry requires three anti-paint protection circuits to be protected from the following situations, such as gasoline vapor, salt spray, brake fluid, etc. The application of electronic systems in automobiles continues to grow rapidly, so the use of three-proof paint has become a basic requirement to ensure long-term reliability of automotive electronic devices. Such as: computer control systems, air conditioning, automotive electronics.


3. Due to the particularity of the aerospace environment, the aerospace and aerospace environments have strict requirements on electronic equipment, especially under conditions of rapid pressure and decompression, and still maintain good circuit performance. The pressure-resistant stability of the three anti-paints is therefore widely used. Such as: satellite system, military control system, flight line control system.


4. Whether it is fresh fresh water or salty sea water, navigation will cause damage to the electrical circuits of ship equipment. The use of three-proof paint can maximize the protection of the water surface and even submerged and underwater equipment. Such as: navigation system, radar control system.


5. The three-proof paint in the electronics industry can protect electronic equipment from erosion by water, moisture, external chemicals and special use environments, ensuring its continued stability, and its application range is very broad. Such as: LED display, LED guardrail tube, solar energy, instrumentation, power supply, inverter, consumer electronics, anti-theft fire alarm device, etc.


Three-proof paint is also called PCB electronic circuit board protective oil, coating oil, moisture-proof paint, three-proof paint, waterproof glue, insulating paint, anti-corrosion paint, anti-salt spray paint, dust-proof paint, protective paint, cover paint, three Anti-glue, PCB circuit board with three anti-paints has waterproof, moisture-proof, dust-proof "three-proof" performance and resistance to cold and heat shock, aging resistance, radiation resistance, salt spray resistance, ozone corrosion resistance, vibration resistance, flexibility Good, strong adhesion and other properties.


Moisture is the most common and most destructive factor for PCB circuit boards. Excessive moisture will greatly reduce the insulation resistance between conductors, accelerate high-speed decomposition, reduce Q value, and corrode conductors. We often see that the metal part of the PCB circuit board is patina, which is caused by the chemical reaction of copper, water vapor, and oxygen that are not coated with three anti-paints.


Hundreds of contaminants found randomly on printed circuit boards have the same destructive power. They can cause the same results as moisture erosion-electronic decay, corrosion of conductors and even irreversible short circuits. The most common contaminants found in electrical systems are likely to be chemicals left over from the process. These contaminants are, for example, fluxes, solvent release agents, metal particles, and marking inks. There are also major pollution groups caused by careless handling, such as body oils, fingerprints, cosmetics and food residues. There are also many pollutants in the operating environment, such as salt spray, sand, fuel, acids, and other corrosive vapors and mold.


Coating three anti-paints on printed circuit boards and components can reduce or eliminate the degradation of electronic operating performance when it may be affected by adverse operating environment factors. If such a varnish can maintain its effect for a satisfactory period of time, such as greater than the life of the product, it can be considered as its coating purpose.


Even if the coating is thin, it can withstand mechanical vibration and swing, thermal shock, and operation at high temperature to a certain extent. Of course, the concept that the film can be used to make the individual parts inserted in the printed circuit board have mechanical strength or sufficient insulation is wrong. The components must be inserted mechanically, and they must have their own joint sealant, so that there is double insurance to prevent accidents.



Brush coating method for three anti-paint operation process


Brush coating method for three anti-paint operation process

The brush method is the simplest method. It is usually used for local repairs and repairs. It can also be used in laboratory environments or small batches of trial production / production. Generally, the coating quality requirements are not high.

The advantages of the brush coating method are that it requires almost no investment in equipment fixtures, saves coating materials, and generally does not require a covering process.

Disadvantages are narrow range of application; lowest efficiency; covering effect when brushing the entire board, poor coating consistency, defects such as bubbles, ripples, and uneven thickness due to manual operation; a lot of manpower required.

Precautions:

Before brushing, first ensure that the diluted product is fully stirred, and it is best to leave it for 2 hours.

Containers containing three anti-paints should be made of metal or plastic, but not wooden or PVC, because chemical reactions will occur, which will corrode the container and damage the product.

Clean and bake plates to remove moisture and moisture.

The dust, moisture and oil stains on the surface of the object to be painted must be removed. Thorough cleaning can ensure that the corrosive residues are completely removed, and the three-proof paint adheres well to the surface of the circuit board.

The selection of the brush is also very important, because the product is not insulated before the product is cured, so choose anti-static, non-shedding brushes, such as high-quality natural fiber brushes.

When brushing, the board should be placed as flat as possible. After the brushing, there should be no dripping. The brushing should be flat and there should be no exposed parts. It should be between 0.1-0.3mm.

The printed circuit board cannot be placed upside down, as this will make the coating thinner and thicker, and it must still lie flat.

Three-proof paint operation process


Three-proof paint operation process

The dip coating method has been widely used since the beginning of the coating process, and is suitable for applications that need to be completely coated. As far as the coating effect is concerned, the dip coating method is one of the most effective methods.

The advantage of the dip coating method is that it can be applied manually or automatically. Among them, the manual operation is simple and easy, and the investment is small; the material transfer rate is high, and the entire product can be completely coated without shadowing effect; and the automatic dip coating equipment can meet the needs of mass production.


The disadvantages of the dip coating method are: if the coating material container is open, as the number of coatings increases, there will be impurities, the materials need to be replaced regularly and the container cleaned, and the solvent volatilization needs to be continuously replenished; the coating thickness is too large And many materials are wasted due to dripping after the circuit board is drawn out; corresponding parts need to be covered; covering / removing the covering requires a lot of manpower and material resources; coating quality is difficult to control. Poor consistency; excessive manual operation may cause unnecessary physical damage to the product;

The main points of the dip coating method are: the loss of solvent should be monitored at any time with a density meter to ensure a reasonable ratio; the speed of immersion and extraction should be controlled. To obtain a satisfactory coating thickness and reduce defects such as air bubbles; operate in a clean and temperature / humidity controlled environment. In order to avoid affecting the knotting force of the material; anti-static and antistatic covering tape should be selected. If you choose ordinary tape, you must use a deionized fan.

Precautions for dip coating:

The circuit board components should be immersed vertically in the paint.

The connector should not be immersed, unless carefully covered, the circuit board should be immersed for 1 minute until the bubbles disappear, and then slowly take out.

A uniform film will form on the surface of the circuit board. Most paint residue should flow from the circuit board back to the dipping machine.

The immersion speed of the circuit board or components should not be too fast, so as not to generate excessive air bubbles.

When using it again after dipping, if there is skin on the surface, remove the epidermis and continue to use it.


Spray coating method for three anti-paint operation

Spraying method is the most commonly used coating method in the industry, and is divided into two types: automatic spraying by machine and manual spraying.

Among them, the machine automatic spraying is suitable for customers of large-scale production, large-scale or long-term production.

Overall spraying equipment TS-300P





The manual spraying is generally a combination of a hand-held spray gun + air pipe + air compressor (+ exhaust fan). The advantages are: low cost, suitable for medium-sized customers. However, it requires a pressure of more than 5KG to form a fog barrier. Therefore, the adjustment of the air pressure is relatively high. If the air pressure is not high, the three anti-paints will not be atomized, will be drawn, and the manual spraying has higher requirements for the accuracy of operation.

Hand can spraying is also a type of manual spraying. The use of spray cans is suitable for maintenance and small-scale production. The biggest advantage is convenience.

In short, the manual spraying has a small investment and is easy to operate. The coating consistency of the machine's automatic spraying is good, the production efficiency is the highest, it is easy to realize online automated production, and it can be suitable for large and medium batch production. Consistency and material cost are usually better than dip-coating. Although the covering process is also required, it is not as high as dip-coating.

The corresponding disadvantages are: need to cover the process; material waste is large; a lot of manpower is needed; poor coating consistency, there may be a shadowing effect, and it enters a difficult dimension below the narrow pitch components.

Three-proof paint operation process


Three-proof paint operation process

Spray coating is a less commonly used three-proof coating method.

The three anti-varnishes stored in the high-level tank are sprayed through a nozzle or a narrow slit, and are showered on the object to be coated driven by the conveying device, forming a uniform coating film. Excess paint is returned to the container and pumped to the high tank for recycling.

In small batch production, manual operation is usually used to directly apply three anti-paints to the product, so the spray coating method is also called the pouring method.

In large-scale production, an automatic assembly line operation is generally used to control the thickness of the three anti-paint coating films on the product by adjusting the size of the nozzle or the width of the slit. If the coating film is thick, bubbles will appear on the coating film of the product coming out of the drying box by the conveyor. If the coating film is thin, the product will be exposed and the coating will be uneven. Therefore, the coating method is also called curtain coating.

According to the characteristics of different products, in order to increase the adhesion of the three anti-paint paint film to the product, sometimes it is necessary to add sulfur; in order to increase the thickness of the product, it is necessary to spray or sulfurize the product once or several times.


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