A board immersion device for inhibiting the volatilization of organic solvents in three-proof paint

Abstract

The present invention provides a board immersion device for inhibiting the volatilization of organic solvents of three-proof paint, which belongs to the field of display screen protective coating coating, and includes a frame and a controller. The frame is provided with a liquid storage tank for storing three-proof paint solution and a working box located above the liquid storage tank for immersing workpieces. An inlet pipe for pumping the three-proof paint solution in the liquid storage tank into the working box and an outlet pipe for discharging the three-proof paint solution in the working box into the liquid storage tank after the workpiece is immersed are provided between the working box and the liquid storage tank. The outlet pipe is also provided with a filter assembly for filtering the discharged three-proof paint solution; a temperature controller for controlling the temperature of the three-proof paint solution in the working box is provided in the working box, and an ultrasonic transducer is also provided on the outer wall of the working box. The temperature controller and the ultrasonic transducer are both connected to the controller. Compared with the prior art, the board immersion device immerses the workpiece in a closed working box, greatly reducing the loss of solvent, reducing costs while reducing VOCs emissions, and effectively protecting the personal safety of employees.

Description

Technical Field

[0001] The invention relates to the field of display screens, in particular to a board immersion device for inhibiting the volatilization of an organic solvent in a three-proof coating. Background Art

[0002] Under realistic conditions, such as chemical, vibration, high dust, salt spray, humidity and high temperature, the circuit board may produce corrosion, softening, deformation, mildew and other problems, resulting in circuit board failure. Conformal coating is a specially formulated coating. Conformal coating can be divided into acrylate, silicone, polyurethane and epoxy resin based on chemical composition. Conformal coating applied to the surface of the circuit board will form a protective film with three protections (three protections refer to moisture-proof, salt spray-proof and mildew-proof). In the presence of chemical substances (such as fuel, coolant, etc.), vibration, moisture, salt spray, humidity and high temperature, the circuit board without conformal coating may be corroded, mold grows and short circuits occur, resulting in circuit failure. The use of conformal coating 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, since conformal coating can prevent leakage, it allows higher power and closer printed circuit board spacing. Thus, the purpose of miniaturization of components can be met.

[0003] The existing three-proof paint has the main disadvantages of short protection period, easy to fall off at high temperature, cannot resist environmental pollutants, especially corrosion by chemical pollutants, difficult to repair, toxic and harmful. Therefore, the optimized three-proof paint on this basis, such as fluorine-containing three-proof paint, can improve the three-proof performance while making the film thickness thinner, with good adhesion, not easy to fall off, and at the same time does not affect the clarity of the display.

[0004] Currently, various methods of applying conformal coatings are spraying, immersing, etc. Since the organic solvents in the conformal coatings are highly volatile, applying the coatings to circuit boards or displays by spraying or immersing can increase production speed, but it consumes a large amount of solvents, the production cost is very high, and it is not environmentally friendly. Summary of the invention

[0005] In view of the volatility problem of existing conformal coatings, especially the fluorine-containing conformal coatings with higher costs, the present invention provides a plate immersion device for inhibiting the volatilization of organic solvents in conformal coatings. During the immersion of workpieces, the volatilization of organic solvents in the conformal coatings can be effectively inhibited, thereby reducing costs and reducing VOCs (volatile organic compounds) emissions.

[0006] The technical solution adopted by the present invention is:

[0007] A plate immersion device for inhibiting the volatilization of an organic solvent in a conformal coating, comprising a frame and a controller. The frame is provided with a liquid storage tank for storing a conformal coating solution and a working box located above the liquid storage tank for immersing a workpiece. An inlet pipe for drawing the conformal coating solution in the liquid storage tank into the working box and an outlet pipe for discharging the conformal coating solution in the working box into the liquid storage tank after the workpiece is immersed are provided between the working box and the liquid storage tank. The outlet pipe is also provided with a filter assembly for filtering the discharged conformal coating solution. A temperature controller for controlling the temperature of the conformal coating solution in the working box is provided in the working box. An ultrasonic transducer is also provided on the outer wall of the working box. Both the temperature controller and the ultrasonic transducer are connected to the controller.

[0008] Preferably, the filter assembly includes a filter connected to the liquid outlet pipe and an electric ball valve arranged in the liquid outlet pipe, and the electric ball valve is connected to the controller.

[0009] Preferably, an overflow pipe is provided between the working box and the liquid storage tank for condensing and returning volatile components in the conformal coating liquid in the working box to the liquid storage tank after evaporation.

[0010] More preferably, the overflow pipe is provided with an exhaust valve.

[0011] Preferably, the working box comprises a box body and a box cover for sealing the box body, the temperature controller is arranged in the box body, and the ultrasonic transducer is arranged on the outer side wall of the box body.

[0012] Preferably, a drain pipe for discharging the conformal coating solution in the liquid storage tank is further provided at the bottom of the liquid storage tank, and a drain valve is provided on the drain pipe.

[0013] Preferably, a cold water interlayer for cooling is further provided outside the liquid storage tank.

[0014] Preferably, wheels are provided at the bottom of the frame, and handles are provided on the frame.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a board immersion device for inhibiting the volatilization of organic solvents in three-proof paints, immerses the workpiece in a closed working box, and uses a temperature controller to heat the three-proof paint liquid. After the volatile components in the three-proof paint liquid in the working box evaporate, they are intercepted and returned to the working box in the form of liquid, or returned to the liquid storage tank through an overflow pipe, which greatly reduces the loss of solvents, reduces costs, and reduces VOCs (volatile organic compounds) emissions, saves costs, and is beneficial to resource conservation and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A front view of a plate immersion device for suppressing the volatilization of organic solvents in conformal coatings provided by the present invention;

[0017] Figure 2The present invention provides a left view of a board immersion device for suppressing the volatilization of organic solvents in conformal coatings. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail with reference to the accompanying drawings.

[0019] Figure 1 to Figure 2 , which is a preferred embodiment of a plate immersion device for inhibiting the volatilization of organic solvents in conformal coatings provided by the present invention. Figure 1 to Figure 2 As shown, the device includes a frame 10 and a controller (not shown in the figure), the frame 10 is provided with a liquid storage tank 20 for storing a three-proof paint solution and a working box 30 located above the liquid storage tank 20 for soaking the workpiece, and between the working box 30 and the liquid storage tank 20, there is a liquid inlet pipe 40 for pumping the three-proof paint solution in the liquid storage tank 20 into the working box 30 and a liquid outlet pipe 50 for discharging the three-proof paint solution in the working box 30 into the liquid storage tank 20 after the soaking of the workpiece is completed, and the liquid outlet pipe 50 is also provided with a filter assembly 60 for filtering the discharged three-proof paint solution; the working box 30 is provided with a temperature controller 31 for controlling the temperature of the three-proof paint solution in the working box, and an ultrasonic transducer 32 is also provided on the outer wall of the working box 30, and the temperature controller 31 and the ultrasonic transducer 32 are both connected to the controller. It is worth noting that the workpiece here is generally a circuit board or a display screen.

[0020] The ultrasonic transducer 32 converts electrical energy into mechanical energy. When the workpiece is immersed in the working box 30, the working box 30 is vibrated to improve the wettability of the three-proof coating liquid on the circuit board surface or the display screen surface, thereby obtaining a better quality protective film.

[0021] The working box 30 includes a box body 301 and a box cover 302 for sealing the box body. The temperature controller 31 is arranged in the box body 301 , and the ultrasonic transducer 32 is arranged on the outer wall of the box body 301 .

[0022] The liquid inlet pipe 40 is arranged at the bottom of the working box 30. Generally, the conformal coating liquid in the liquid storage tank 20 is pumped into the working box 30 by a liquid pump, and the liquid pump is connected to the controller. An overflow pipe 70 is also arranged between the working box 30 and the liquid storage tank 20, which is used for the volatile components in the conformal coating liquid in the working box 30 to evaporate and condense and flow back to the liquid storage tank 20. The overflow pipe 70 is provided with an exhaust valve 71. When the conformal coating liquid in the working box 30 is soaking the workpiece, the temperature controller heats the conformal coating liquid, and the volatile components in the conformal coating liquid will evaporate, a part of which enters the overflow pipe, and then condenses and flows back to the liquid storage tank 20; the other part evaporates to the box cover 302 of the working box 30, and then condenses and falls into the working box 30.

[0023] The filter assembly 60 includes a filter 61 connected to the liquid outlet pipe 50 and an electric ball valve 62 disposed in the liquid outlet pipe 50 . The electric ball valve 62 is connected to the controller. When the conformal coating solution in the working box 30 is discharged, the electric ball valve 62 is first opened, and the conformal coating solution in the liquid outlet pipe 50 is filtered by the filter 61 and then discharged into the liquid storage tank 20 .

[0024] A drain pipe 21 for discharging the conformal coating solution in the liquid storage tank 20 is also provided at the bottom of the liquid storage tank 20, and a drain valve 211 is provided on the drain pipe 21; a cold water interlayer 80 for cooling is also provided outside the liquid storage tank 20 to reduce the temperature of the conformal coating solution in the liquid storage tank 20 and reduce the volatilization of volatile components.

[0025] The bottom of the frame 10 is provided with wheels 11 , and the frame 10 is also provided with a handle 12 to facilitate pushing the entire frame 10 .

[0026] The operation process of the immersion plate device is as follows:

[0027] 1. Press the liquid filling switch to add the conformal coating solution in the right proportion, and pump it from the liquid storage tank 20 into the working tank 30. The process will stop automatically when the solution is full.

[0028] 2. Turn on the thermostat 31, heat, set the working temperature, and turn on the ultrasonic transducer 32;

[0029] 3. When the temperature reaches the set temperature, immerse the working board into the working box 30, and close the box cover 302, and the timing starts;

[0030] 4. When the time is up, the ultrasound stops, the alarm sounds, the thermostat 31 is turned off, the temperature is cooled, and the electric ball valve 62 is pressed. The liquid in the working tank 30 is discharged into the liquid storage tank 20;

[0031] 5. Open the box cover 302 and take out the workpiece with a work clamp for subsequent process operations;

[0032] 6. Repeat steps 1-5. Workpieces can be processed individually or in batches, depending on the size of the workpieces.

[0033] The use of the immersion device has the following advantages: 1) The cost of the three-proof paint liquid is greatly reduced. The use of the closed working box 30 reduces the evaporation of the solvent into the atmosphere. The volatile components in the three-proof paint liquid in the working box 30 are intercepted after evaporation and return to the working box 30 in the form of liquid, or return to the liquid storage tank 20 through the overflow pipe, which greatly reduces the loss of solvent. 2) Better wettability. The ultrasonic transducer 32 vibrates at a frequency greater than 20KHZ, causing the liquid in the working box 30 to form high-frequency stretching and compression, thereby generating tens of thousands of tiny bubbles. These bubbles are formed and grown in the negative pressure area of ​​the longitudinal propagation of the ultrasonic wave, and quickly close in the positive pressure area. At the moment of closure, an instantaneous high pressure is formed and ruptured, so that the liquid in the working tank is better dispersed through this vibration, and the liquid has better permeability on the surface of the workpiece, especially for grid-like circuit boards or large display screens, showing obvious advantages. 3) The film thickness is reduced and the uniformity is good. The device of the present invention can form a film on the workpiece more quickly and evenly, so that the film thickness covers more completely, is more even and thinner, and avoids the phenomenon of visual blurring caused by uneven thickness or too thick thickness. 4) The entire operation process is carried out in a closed environment, and the liquid in the working box 30 and the liquid storage tank 20 are in a closed system, which reduces the emission of VOCs and the use of chemical liquid, which is beneficial to resource conservation and environmental protection.

[0034] In summary, the technical solution of the present invention can fully and effectively achieve the above-mentioned invention purpose, and the structure and functional principle of the present invention have been fully verified in the embodiments, and can achieve the expected effect and purpose. Without departing from the principle and essence of the present invention, various changes or modifications can be made to the embodiments of the invention. Therefore, the present invention includes all replacement contents within the scope mentioned in the scope of the patent application, and any equivalent changes made within the scope of the patent application of the present invention are within the scope of the patent application of this case.

Claims

1. A plate immersion device for inhibiting the volatilization of organic solvents of conformal coatings, characterized in that: It comprises a frame and a controller, wherein a liquid storage tank for storing a conformal coating solution and a working box located above the liquid storage tank for soaking a workpiece are provided on the frame, an inlet pipe for drawing the conformal coating solution in the liquid storage tank into the working box and an outlet pipe for discharging the conformal coating solution in the working box into the liquid storage tank after the workpiece is soaked are provided between the working box and the liquid storage tank, and a filter assembly for filtering the discharged conformal coating solution is also provided on the outlet pipe; a temperature controller for controlling the temperature of the conformal coating solution in the working box is provided in the working box, an ultrasonic transducer is also provided on the outer wall of the working box, and both the temperature controller and the ultrasonic transducer are connected to the controller; an overflow pipe is also provided between the working box and the liquid storage tank for condensing and returning the volatile components in the conformal coating solution in the working box to the liquid storage tank after evaporation; an exhaust valve is provided on the overflow pipe; A cold water interlayer for cooling is also provided outside the liquid storage tank; The filter assembly comprises a filter connected to the liquid outlet pipe and an electric ball valve arranged in the liquid outlet pipe, and the electric ball valve is connected to the controller.

2. The immersion device for suppressing the volatilization of organic solvents of conformal coatings according to claim 1, characterized in that: The working box comprises a box body and a box cover for sealing the box body. The temperature controller is arranged in the box body, and the ultrasonic transducer is arranged on the outer side wall of the box body.

3. The immersion device for suppressing the volatilization of organic solvents of conformal coatings according to claim 1, characterized in that: The bottom of the liquid storage tank is also provided with a drain pipe for discharging the conformal coating solution in the liquid storage tank, and a drain valve is provided on the drain pipe.

4. The immersion device for suppressing the volatilization of organic solvents of conformal coatings according to claim 1, characterized in that: The bottom of the frame is also provided with wheels, and the frame is also provided with handles.

Images