Zhang Xiaofan looked at the eyes of several people who were eager to learn, and simply explained a little.

"Ordinary flat coatings, because of the addition of fillers, that is, barium sulfate or calcium carbonate, so that the overall viscosity of the coating increases, so as long as about 0.8% of 701 is added, it can play an anti-pollution role. ”

Zhang Xiaofan paused slightly, giving them a moment to think for a while.

"Let's move on to the topic, can 701 be applied to transparent wheel coatings?"

"I don't think so, because 701 is not involved in chemical reactions, so its performance will definitely not be stable enough, and it may cause scratches on the surface of the paint.

And if it takes a long time, it may be easy to turn yellow or something. ”

Liu Qi, who had just been encouraged by Zhang Xiaofan, began to speak again.

Zhang Xiaofan nodded with satisfaction.

"Like this very strict, flat paint, try not to use 701.

That's the water point, how do you solve it?"

In the knowledge reserve of this technician, it is estimated that the only way to solve the water point is to add this kind of additive.

So Zhang Xiaofan was not ready to let them answer.

"What kind of leveling agent are you using?"

“468”

This is a very expensive leveling agent for transparent powder, but this leveling agent has a very big disadvantage, it is very easy to produce water spots.

Especially in paints without the 701 system.

The application of this leveling agent in foreign countries is very extensive, but in China, because the coating of this leveling agent is easy to produce water point shrinkage holes, so it is not used much.

"Let's change the flow"

Liquid flow is the synonym for liquid leveling agent, which is a leveling agent that has not been dispersed.

Because it is very viscous, it has to be diluted by fumed silica to become a very common leveling agent on the market.

"We're over the flow, and he's very difficult to disperse. ”

The flow is very viscous, so dispersion is a very big problem.

"Which mixer did you use to mix it?"

"The little mixing tank for the experiment. ”

"Did you turn on the re-motor?"

"That's right."

Liu Qi said very reasonably, and he was also very puzzled.

According to Zhang Xiaofan's tone, shouldn't the auxiliary motor be turned on?

If you don't turn on the auxiliary motor, it will be even more difficult to disperse the liquid flow.

Seeing Liu Qi's doubts, Zhang Xiaofan smiled very strangely.

"Do you know Tai Chi?"

Tai Chi, does this have anything to do with what paint we do?

Four or five people all looked at Zhang Xiaofan very suspiciously, now we are discussing the matter of the diffusion of leveling agents, how did you talk about Tai Chi.

This is a very big problem, Tai Chi everyone knows, so several of them nodded, but the doubts in their hearts are even stronger.

"If you know Tai Chi, that's easy to say.

Tai Chi is the greatest example of overcoming rigidity with softness.

Liquid flow, what we need to use is to overcome rigidity with softness.

The main motor is soft, and the auxiliary motor is rigid.

Therefore, when we stir the raw materials, especially the raw materials with liquid flow, do not turn on the auxiliary motor. ”

"But ......"

Zhang Xiaofan stood up and clapped his hands.

"It's useless to talk too much, let's experiment to see the truth, Liu Qi, ask someone to prepare the materials, let's see what the truth is.

Although discussion can make the truth clearer, if you don't act, the truth is still false. ”

Several people came to the laboratory together, which was a separate working area, mainly some equipment in the laboratory.

In one of the small sub-rooms, you have a much smaller machine, which is not much smaller than the production machine, but the price is several times more expensive.

The main function of this machine is to detect the performance of various raw materials, this machine can distinguish between the subtle differences between raw materials.

Of course, this is definitely an import.

The current technical level in China does not meet his requirements, which is also a helpless thing.

Liu Qi personally operated, and Zhang Xiaofan has always encouraged technicians to operate the machine personally.

Because it's only with the machine you're operating yourself that you can feel the subtle differences between the different parameters.

You can better understand what the technology is all about.

Bags of raw materials are poured into the mixing tank.

"Mr. Zhang, are there any requirements for the time setting?"

"About four minutes, it's too long, it can easily cause heating, which may lead to a change in performance.

If the time is short, the coagulation effect may not be satisfactory and will not be too uniform. ”

Some of the other parameters have not changed, but there are no other parameters for the mixing tank.

This is Zhang Xiaofan telling him to adjust the speed a little slower.

About 70% of the usual amount is enough.

The machine started slowly, and the cylinder was opaque, so I didn't know what the situation was inside.

This kind of thing will make people anxious, and now there are only four minutes, but obviously Liu Qi is a little unable to stand, staring at the mixing tank for a while, and staring at Zhang Xiaofan for a while.

As soon as the time stopped, Liu Qi was about to open the lid immediately, but Zhang Xiaofan stopped him.

"Why are you in such a hurry? There's still dust floating up in there, let that dust settle down a little more. ”

When the mixing tank is stirring, because the raw materials have a lot of fine powder, it is easy to generate dust in the cylinder, and after the mixing is completed, do not open the cylinder head immediately.

Be sure to wait a while for the dust inside to come down so that it doesn't pollute the studio.

After waiting for nearly three minutes, Zhang Xiaofan nodded and asked Liu Qi to open the cylinder head.

The moment it was opened, Liu Qi's mouth slowly turned into an O-word, although he was very, very surprised.

In his subconscious experience, this viscous substance, which is difficult to disperse, must be violently broken so that it can be dispersed more evenly.

Some time ago, he also used a liquid leveling agent, but the main motor and auxiliary motor were all turned on, but the dispersion effect was very poor.

There are still lumps of liquid leveling agent in the raw materials, which are completely undispersed.

But now the auxiliary motor is not turned on, and the result is very surprising to him.

He couldn't see a single lump of material at all, and he didn't believe in evil and used his hands to pick up the layer of raw materials on top to see if there was any tiny lumpy lump of material inside.

"How?"

"Very well dispersed. ”

"What kind of liquid leveling agent did you just use?"

There are many varieties of liquid leveling agents, and the ones used in powder coatings are generally acrylic liquid leveling agents. Read the latest chapters, stay tuned