The three-proof coating of PCB circuit board refers to waterproof, moisture-proof and dust-proof.

We know that moisture is the most prevalent and damaging major factor for PCB circuit boards.

Sometimes we see circuit boards, and the metal parts are patina, which is why the conformal coating is not applied.

This is a chemical reaction produced by the joint participation of copper metal with water vapor and oxygen.

For a long time, most conformal coatings are solvent-based, and there are many types.

Most of them do not participate in the reaction, but are simply coated on them, which plays the role of waterproof, moisture-proof and dust-proof.

Of course, conformal coating also has one of the most significant properties, which is insulation.

Why are powder coatings rarely applied to circuit boards?

This is because powder coatings generally require very high temperatures to cure.

The circuit board can't withstand high temperatures, so it can't bake, can't bake solid powder, then it can't play these roles.

Zhang Xiaofan didn't know, he didn't know what Qin Wei'an said to these manufacturers.

"Can't they use solvent-based ones?"

"I don't know much about it, anyway, when I talk to them about this, you know, our industrial park is mainly about environmental protection and high-tech.

If it is a solvent-based conformal coating, it must not be used.

So I encouraged them to do the industrial upgrading of the enterprise, I pushed you to the forefront, I was boasting Haikou, saying that your paint can be applied to the circuit board.

But now you're saying you can't do it, it's ......."

Zhang Xiaofan was speechless, you are for your investment work.

But you didn't figure out anything, so you sold us.

Although conformal paint is also called paint, it is actually different from paint and solid powder coating.

"Hey, what are you going to do with me?"

"For a company, it is actually very important for the park, not only to create a lot of jobs, but also to attract a lot of high-tech manufacturers for its upstream and downstream.

Manufacturers of various electronic devices, such as mobile phones and televisions, so you must help with this. ”

Zhang Xiaofan calmed down and thought about it, solvent-free coatings, this must be a trend.

But it also depends on what kind of industry, fire protection did think about low-temperature curing coatings, but obviously, the surface effect is not up to standard, so this road has also been broken.

Solvent-based acrylic conformal paint, in fact, the whole coating is relatively crisp and cannot withstand too many collisions, so sometimes a sharp object can easily scrape the coating off.

"I'll go back and talk to the technology and see if I can look into it. ”

At least for now, Zhang Xiaofan has nothing to do, but this problem must be solved by Qin Wei'an.

I don't know if there is such a solvent-free conformal coating in the world, after all, the main focus of this industrial park is environmental protection and high-tech.

This time he must have helped, Zhang Xiaofan still owes Qin Wei'an, several favors.

The most difficult thing in the world to repay is the debt of human affection, and there is no information about conformal paint in my memory, what is the reason for this? Zhang Xiaofan does not know.

Why 30 years later, there is no conformal coating for solid powder coatings in his memory, Zhang Xiaofan really doesn't know.

Back to the company, Zhang Xiaofan called Liu Qi, and then selected all the company's technicians with a bachelor's degree or above.

This time, other things should be put first, including the wood grain transfer print, which should also be put first.

As for Liu Wencai, Zhang Xiaofan also left it behind, and waited until he was busy with this matter.

Let him bounce for a few days.

This is also something that can't be helped, and things like returning favors should be prioritized.

"This time, it's mainly up to you, and I can't provide you with much information.

Because I have never touched this kind of paint, I don't even know if I can make it successful!

So this time the task must be very arduous and require you to contribute your ingenuity.

Apply what you know and what you have learned. ”

Everyone's expressions became serious, in the past, Zhang Xiaofan would provide a basic formula.

Or point out a direction and let them conduct research, in this way, so that they can easily research results.

But now basically nothing will be provided, only a few requirements.

"This is a circuit board used for coatings, and first, he needs to be transparent. Second, his requirements are moisture-proof, dust-proof, mildew-proof, and salt-spraying. Third, the curing temperature should not exceed 60 degrees. Fourth, the spraying process should also be very simple. Fifth, it must not contain any solvents. Sixth, it must be insulated. Seventh, the adhesion should be good.

Don't limit yourself to powder coatings, try water-based coatings. ”

Zhang Xiaofan just thought that since he has no memory of this, it may not belong to solid powder coatings, so he should use water-based coatings.

However, at present, water-based coatings are still in their infancy, and Zhang Xiaofan doesn't know if this group of technicians can develop any reputation?

Water-based paint This is a point that Zhang Xiaofan can not bypass, as one of the environmentally friendly coatings, it is very polluting to the environment compared with oil-based coatings.

However, water-based coatings also have some fatal weaknesses, such as its very high requirements for the cleanliness of the substrate surface, otherwise it is easy to cause shrinkage porosity in the coating film.

In addition, if it is a bake-type water-based paint, the requirements are even higher.

It is more demanding than solid powder coating, because it is water, so you also need to adjust the temperature and humidity equipment.

However, as a part of environmentally friendly coatings, many of the underlying solid powder coatings can only be sprayed with water-based coatings.

Zhang Xiaofan basically determined the future research direction, as much as possible to make solid powder coatings, suitable for all substrates, whether uneven, or electronic equipment, or wood and plastic, and even exterior walls.

Zhang Xiaofan has an ultimate dream, that is, in the future, solid powder coatings do not need professional people and equipment to spray, ordinary people can use solid powder coatings for spraying, then that time is the moment when solid powder coatings completely replace oil-based coatings and water-based coatings.

With so many technicians, now is the time for them to display their talents, and Zhang Xiaofan has already said the big requirements.

But how can they study it? Zhang Xiaofan can only let them go.

Zhang Xiaofan is still self-aware, and when it comes to research ability, this is definitely inferior to theirs.

If it weren't for some formulas in his mind, these experiences, it is estimated that in many aspects, Zhang Xiaofan would think that he is not as good as them.

As for Zhang Xiaofan himself!

There are not many things to do, but there is one thing that Zhang Xiaofan still thinks should be carried out, that is, the construction of the future coating laboratory.