First, is the board washing water the future development direction of the circuit board?
Several cleaning agents for circuit board cleaning.
1. Regarding board washing water: Many categories and materials of HCFCS are currently on the prohibited and restricted use list, and it is suggested that it is not appropriate to use HCFCS as solvents as board washing water in the manufacturing process of electronic circuit board components, otherwise it will pose environmental risks to the manufacturer and will cause physical and mental damage to the staff.
2. Hydrocarbon cleaning liquid: hydrocarbon cleaning liquid can be manually cleaned or wiped with local surface treatment, but the air in the working environment is smooth, and the concentration is within the standard value.
3. About water-based cleaning agents: Using water-based cleaning agents as board washing water is the last choice faced by manufacturers and industry insiders. At present, SMT and even water-based cleaning agents on DIP manufacturing can be used for offline cleaning of SMT line steel mesh, online cleaning of solder paste steel mesh printing, PCBA circuit board cleaning, fixture maintenance cleaning and internal combustion engine maintenance cleaning are fully covered. Eliminate the risks to the health of the staff and the environment, while controlling all pollutants within the effective control range, and truly realize the need for cleaner production.
The application range of electronic circuit board processing and washing board water.
The invention is widely used for cleaning plate washing wastewater during the processing of electronic circuit board and removing rosin residue and solder paste residue after welding of circuit board components. Such as manual repair and repair of solder residue and even surface dirt, or the washing board water treatment method that we all know for historical reasons can be used for spraying, ultrasonic, manual scrubbing and machine washing of the machine. Washing board water will be used to remove the above dirt, these methods have been widely used in the production of electronic circuit board components, including electronic components, which is called washing board water.
Overview of the development process of washing board water.
The washing industry has experienced three historical periods. With CFC-113, trichloroethane, trichloroethane, trichloroethylene as the representative of washing board water, the main component is chlorofluorocarbon washing water, they all have a good ability to dissolve residue and rosin, low boiling point, fast volatilizing speed, good drying performance, easy to use, it is widely used in the industry, can better solve the practical problems of production.
Analysis of advantages and disadvantages of washing board water.
Substances and substances such as board washing water have a great impact on human health and safety, pollute the atmosphere and seriously destroy the ozone layer. Although trichloroethylene can reduce the destruction of the ozone layer, it will cause great harm to human health, especially it is easy to cause the damage of the blood system, digestive system and nervous system of employees in high concentration environment, and cause occupational diseases such as leukemia and cirrhosis. Endanger the operator's physical and mental health and physiological function.
With the upgrading of the industry, such washing water gradually withdrew from the application market, the emergence of hydrocarbon washing board secondary and secondary, with alcohol solvents and hydrocarbon solvents as the main raw materials, with hydrocarbon washing board water as the raw material, from the comprehensive consideration of safety and environmental protection, environmental friendliness has been improved, during this period, the harm to the human body has been reduced, the impact on the atmosphere has been reduced.
However, in terms of safety, the risk of explosion has increased, such materials generally have flammable and explosive characteristics, the flash point is very low, because it is extremely volatile, it is easy to cause an increase in the concentration of the solvent environment, and the risk of explosion will be generated when encountering Mars cremation, which is generally flammable in the process. For example, in the application of steel mesh cleaning machine, due to the use of hydrocarbon cleaning agent as washing board water to clean steel mesh board, although safety precautions have been taken on such products in the equipment configuration, but still use a full pneumatic spray, inevitably due to the electrostatic spark in the pipeline and around the equipment caused by the explosion, which often occurs in the application manufacturer.
In addition, in the manual scrub and scrub methods, there are also long-term hazards to the human body, n-hexane is one of the most typical examples, now many industry manufacturers are in the material management standards of the document, clearly can not contain n-hexane, due to a world-renowned manufacturer of n-hexane many years ago, there have been large-scale poisoning incidents of employees, The social impact is so bad that n-hexane has been banned since then.
Characteristic analysis of hydrocarbon cleaning agent.
Hydrocarbon cleaners have such characteristics as:
(1) The cleaning force is lower than the cleaning force of hydrochlorofluorocarbons, and the removal capacity is weak.
(2) safety risks, especially flammable and explosive, especially in places with high air content.
(3) The boiling point is low, the volatilization rate is fast, the consumption is large, and the cost is increased correspondingly.
What cleaning agent is the future direction of circuit board cleaning?
With the upgrading of the industry, the board washing water enters a process that replaces the traditional board washing water with a semi-water-based and all-water-based method, forming a new material and process form to meet the technical requirements of the industry for the cleaning of electronic circuit board components.
The final replacement of board washing water is also the development direction of the industry application, water-based cleaning agent has high safety, environmental protection characteristics, can completely remove the residue, all pollutants can be controlled and achieve environmental protection characteristics within a controllable range, and even greatly reduce the production cost, the industrial sector has been increasingly used in the production process of circuit board components.
Cleaning the circuit board, cleaning the flux, solder paste residue process, and washing board water are essential, but it is just a question of how to compose the washing board process. Ultrasonic or spray method is used to clean the residual dirt of the flux to ensure the electrical safety, reliability and stable performance of the electronic circuit board. With the development of industrial raw materials, it has entered the no-wash system and the purification of no-wash agent instead of cleaning material, and the washing water has also been reduced, but the manual removal of no-wash flux traces after wave soldering and the post-welding repair welding is the use of manual or mechanical brushing to remove the residue, from the appearance and ensure the reliability of the electrical performance of the circuit board, requiring the surface to be arranged.