Zhang Xiaofan looked at Liu Qi.

"I won't talk about this paint, basically some things, polyurethane paint, I think you yourself should know how to produce it.

I'm telling you, this about anti-graffiti. ”

Liu Qi nodded, what he wanted to know most was naturally this.

Zhang Xiaofan glanced at him and continued.

"Anti-graffiti coatings are simple and complex.

The principle is actually very simple, that is, a substance with a very low surface tension is added, so that the surface of the coating has a very low surface tension.

We all know the self-cleaning effect of the surface of the lotus leaf, because the surface tension is relatively low, and some paper stickers such as self-adhesive stickers are easily torn off when pasted on them.

I want to draw a picture on the paint with a grease pen and it is very easy to clean. ”

Liu Qi suddenly realized that this should have been through the self-cleaning effect of the lotus leaf, and if the water drops on the lotus leaf, a bead will roll down.

And it is also a substance with very low surface tension, so it is also very clean.

It turns out that the principle of paint is also found from life, if it weren't for Zhang Xiaofan saying so, he really didn't know.

"I never thought that surface tension could be used in this way. ”

Zhang Xiaofan frowned, the surface tension in the paint is only very widely used.

The most common is wrinkle paint.

The kind of paint that looks like an undulating mountain range makes use of the principle of different surface tensions.

This wrinkled coating is formed by adding a float agent with a very low surface tension to a paint with a very high surface tension.

However, the surface tension of the entire surface of this anti-graffiti coating is very low, so the anti-pollution resistance of this coating is actually very strong.

"To reduce the surface tension, the most common way we use it is naturally to add silicone to reduce the surface tension.

The other way, let's not talk about it.

Now there is no such raw material at all, and we will talk about that raw material in the future. ”

In fact, it is to fill a nanoscale material, so that the entire coating surface, at the microscopic level, becomes very flat.

A lot of paints, we look very smooth on the surface.

But in reality, on a microscopic level, he is still bumpy.

Therefore, some very, very fine fillers, that is, nano-level substances, are needed to make the surface very flat at the microscopic level, so that some oily substances cannot stay on the surface, so as to achieve the effect of anti-graffiti.

However, this filler is not applied to solid powder, and can only be used after technological progress in the future.

"Thank you, Mr. Zhang, I think I should know more about this vote, if there are other problems that cannot be solved in the experiment, I will come to you again. ”

Zhang Xiaofan nodded, and seeing that Liu Qi was about to leave, Zhang Xiaofan suddenly thought of a technical point, so he stopped Liu Qi.

"I'll say a little more!

Sometimes we get some orders that require the gloss of the paint surface to reach more than 115 degrees.

This is a difficult point, especially in epoxy polyester coatings, where gloss is even more difficult to achieve.

So how do we solve it?"

Liu Qi scratched his head, how do you know this, because there has never been such a request, but now Zhang Xiaofan has brought it up.

It's not that you can get the answer to this thing by reading a lot of books, but there should be very few people who have mastered this paint, and you can't find it in the book at all.

So Liu Qi shook his head.

"I've never been exposed to this aspect, and I'm sure that if I want to make a 100-degree coating, it's a matter of luck if I want to improve the gloss. ”

In fact, Liu Qi's answer disappointed Zhang Xiaofan.

The gloss of the paint does affect many aspects.

The first is naturally the choice of raw materials, choose better raw materials, the gloss will naturally be much higher, sometimes 7 to 10 degrees different.

The second is on the production equipment.

What is related to the luster is naturally the mixing effect, that is to say, the more uniform the mixing, the higher the gloss.

Third, this is related to the particle size of the coating, the more uniform the particle size, the higher the gloss quality.

There is another kind that Zhang Xiaofan is going to say next.

"I won't talk about the rest, improve the gloss of the high-gloss coating, if the polyurethane coating we are talking about now has a relationship.

In ordinary coatings, about 15% polyurethane and polyurethane curing agent are added.

The gloss can be increased by 10 to 15 degrees.

In the process of producing coatings, the first few boxes of finished products are returned, mixed with raw meal again, and then extruded, and the luster can be increased by about three or four degrees. ”

Obviously, what Zhang Xiaofan said was some very detailed aspects.

These things are often related to the quality of the coating, although the formula, raw materials can determine 80% of the quality of the coating.

However, if these details are not handled well, such as the particle size control of the coating, the control of the addition amount of some additives, and the screw configuration of the machine .......

These things control the other 20% of the quality of the paint.

Don't underestimate this 20%, this 20% represents the difference between high-end and ordinary paints.

Why is it so expensive for others to sell, and why is it so convenient for customers to use other people's paints?

Why the same raw materials, the same formula. Someone else's paint is better than yours.

This is the handling of details, knowledge can determine your width, but details will determine your height.

So now Liu Qi is very grateful to Zhang Xiaofan, these details are something that few people will say.

Because it's these details that determine the height of a technician.

Liu Qi bowed to Zhang Xiaofan very formally.

This made Zhang Xiaofan stunned, Zhang Xiaofan actually felt that he didn't do a good job.

On the contrary, I feel that I owe Liu Qi a little, especially in the past two years, I have been conscientiously completing the tasks assigned by Zhang Xiaofan, and I have never slacked off.

Now I don't think it's very embarrassing for Zhang Xiaofan.

"Let's prepare, let's see if we can make it today, there should be material companies that should have it, make one out first, and let customers try it."

Mass production may be going on tomorrow, so you have to make it as fast as possible, and time is not waiting for anyone. ”

"I'm going to prepare right now, and today is overtime, and I'm going to do it too. ”

Zhang Xiaofan naturally knew that there should be no need to work overtime, after all, there should be everything, and it was just these few experiments.

Adjust the color, add the formula, and make some subtle adjustments, so that the whole paint becomes more delicate, and the cost is reduced as much as possible.

In fact, it may sound difficult, but after you do a lot of research, you will find that this is a set of relatively regular routines.

But since Liu Qi has expressed his position, the boss always has to say something.

So he patted Liu Qi on the shoulder to show encouragement.