After dealing with this matter, Zhang Xiaofan came to the technical department again to see how their research and development progress was.

Through the window, Zhang Xiaofan saw several people around a table, not knowing what they were discussing.

There are two people who react quite violently, and Zhang Xiaofan is encouraging in this situation.

When you express your own opinions during the discussion, you just fight for red faces, it doesn't matter, the more you argue, the clearer the reason.

Zhang Xiaofan gently pushed the door in.

In this way, their discussion can be heard clearly.

"Definitely going to join 701. ”

701 is one of the thermoplastic polyesters, which is a brightener.

Of course, its main role is not to increase brightness and gloss, but to resist pollution and wet the substrate.

"No, foreign solid powder coating products basically do not add 701 as an additive, although 701 is said to be an anti-pollution agent, but in fact it is also a pollutant. ”

"If you don't add 701, how can this water point be solved?"

"We just have to think of ways to make the production environment even more pure. ”

"You guarantee that the environment in which you produce is pure, and the products produced are also very pure, but can you guarantee that the workshop where the wheels are sprayed can meet this purity?"

Hearing this, Zhang Xiaofan basically knew what was the reason for the controversy?

Water spots, in fact, are shrinkage holes.

We can often see this kind of defect, and many flat coatings sometimes have this kind of shrinkage water spots.

On a very flat piece of coating film, there is a small depression, which can be large or small, which greatly affects the overall aesthetics of the coating film, and will also have a very large impact on the anti-rust performance of the coating film.

There are some shrinkage holes, the aperture is very large, some can even reach 2 to 3 mm, this kind of shrinkage holes, it is difficult to repair, if you want to deliberately repair, the first is a very waste of raw materials, you have to repair the whole piece, and it is very easy to produce pinholes.

Therefore, it is a very nerve-wracking thing to encounter very large shrinkage holes.

What's more, the requirements for the current research and development of this transparent wheel coating are very, very high, which is not allowed to have a little flaw.

There must not be any water point shrinkage porosity, and the cause of porosity is actually very simple.

Contaminate.

Two incompatible substances with different surface tensions are very prone to pollution.

They ran into this problem because of other paint molecules escaping in the air, or different types of paint remaining in the machine.

It is possible to pollute this transparent wheel coating, resulting in the formation of water point shrinkage holes.

When Liu Qi saw Zhang Xiaofan coming, he immediately straightened up.

"Mr. Zhang"

Zhang Xiaofan nodded.

"What about the discussions, and what are the results?"

Liu Qi shook his head very seriously, and at the same time was a little bitter.

Originally, he thought that this kind of transparent wheel should be very easy to develop, but who knew that it was still in the laboratory stage, and all kinds of problems had already appeared.

"I just solved the problem of dispersion a few days ago, and I have encountered a water point problem in the past few days, but I don't have a clue at the moment. ”

At this time, a young technician stood up.

Zhang Xiaofan nodded at him and signaled that he could speak.

"Mr. Zhang, I think that since 701 can solve the problem of shrinkage holes at water points, why don't we use it?"

It's good to be good at thinking, but be sure to think carefully about the pros and cons.

"You sit down first, and I'll give you an analysis today. ”

Everyone is sitting upright, and the four or five people present know that Zhang Xiaofan's skills, no matter the depth or breadth, are not comparable to their group of people.

Any problem can be easily solved in Zhang Xiaofan's hands.

Although they have always wondered why Zhang Xiaofan has such strong problem-solving skills, they still have to use so much time and financial resources to train their group of technicians.

"701, this is a thermoplastic resin, thermoplastic coatings you should have heard of.

It is originally solid, but through melting and leveling, it is attached to the surface of the substrate to play a role in aesthetics and anti-corrosion.

But this thermoplastic coating has a fatal drawback, it does not undergo a chemical reaction, it is more of a physical process.

So this kind of paint, his shortcomings are very obvious, hot and cold his state will be different, when it is cold, it will be very hard and brittle, when hot, it will become very soft.

So this thermoplastic resin, if you think about it, can it be applied to cars?"

Zhang Xiaofan gave them knowledge again, in fact, thermoplastic resins such as 701 will have similar properties.

In fact, few foreign manufacturers use 701 as an additive, because 701 itself is a pollutant.

Domestic 701 is very popular, mainly in the plane of paint, all will be added to 701.

Because if you don't add 701 as an additive, your product will be easily contaminated by other companies' products, which will be very obvious.

As long as the products of other companies fall into it a little bit, your company's products are prone to defects such as small pinholes after the painting is completed.

Because all the products of other companies have added 701, if you don't add them, then the products of other companies will become a source of pollution, and your company's products have no effect on their products.

This is a problem of the general environment, if all the powder coating companies in China do not join 701, do not want this kind of additives, this problem is not a problem.

However, now all the plane products of Zhimei New Materials have also added 701, so it will cause pollution to this product without 701, which is unavoidable.

"Mr. Zhang, I think it should be feasible, after all, he doesn't have a lot of family, it won't exceed 0.8%, so there should be no problem. ”

This is the technician who just spoke, and it is clear that he has not learned his lesson, and his basic knowledge is not firmly established.

"Let's teach you a little more, all transparent flat coatings, additives should be increased a little, if you ordinary flat coatings, add 701 to the dosage of 0.8%, then transparent paint you have to add at least 1.2%.

Can anyone say why?"

Liu Qiyu raised his hand hesitantly, and Zhang Xiaofan motioned for him to say.

"Is it because of viscosity?"

Zhang Xiaofan snapped his fingers.

"It's good, I didn't say that question, you can imagine, it's really improved. ”

After Liu Qi heard this, he actually showed a little embarrassment, which made several other technicians present very curious after reading it.

In fact, in their eyes, Liu Qi's skills are also very superb, and they are not comparable to their group.

But now after Zhang Xiaofan praised it, he actually became so shy, embarrassed, sure enough, everything was done. Read the latest chapters, stay tuned