A large number of highly educated researchers have joined, making the progress of research and development faster day by day, and once the direction is established, the speed of research and development has also increased a lot.

Just when Zhang Xiaofan summoned R&D personnel to gather in the capital for more than a month, this time point was very close to the time limit given by Professor Qin.

Through the cooperation of nearly 200 technicians in the polyester branch, the curing agent company, and the powder branch, a powder coating that can form a suspension in an aqueous solution for a long time has finally been developed.

The product developed by Professor Qin and his team is even simpler, because they can use it with a simple improvement on the paint spraying equipment.

But what the effect is, it is necessary to conduct experiments on the products developed by Zhang Xiaofan and his team on this equipment before they can draw conclusions.

It's sunny weather again.

The air in the capital has always been relatively dry, especially in recent times, Zhang Xiaofan has been busy, so he often forgets to drink water, but in recent days, he feels that his skin is about to burst, and it is generally like touching a rough cloth, which is very prickly.

Not only Zhang Xiaofan, but also more than 200 technicians also felt how terrifying the dry air in the capital was.

Nowadays, when many people buy skin care products, the first thing they consider is whether you can keep it hydrated, that is, the oilier the better.

This is quite different from the skin care products demanded by southerners.

Zhang Xiaofan often feels such an atmosphere, including Professor Qin, everyone gathers in front of a laboratory bench to see if this equipment can spray suspension.

For nearly half a year, Zhang Xiaofan has been tired of being equipped with Taiwan.

From the very beginning, he imitated the electrostatic powder spray gun on the market, and then Zhang Xiaofan thought that it was profitable, not only to train workers, but also to earn a certain profit for the company, but the result was very unsatisfactory, and even had the opposite effect, which indirectly affected the powder sales of Zhimei new materials.

Zhang Xiaofan didn't know Chen Ying's attitude, but Zhang Xiaofan's attitude was very clear, and every time he saw Zhang Xiaofan, he would persuade him to give up this plan.

It's also ridiculous to say how complicated the electrostatic powder spray gun was when it was developed, but now this spray gun can no longer be called an electrostatic powder spray gun.

The structure is very simple, a manual gas compression device, a device similar to a watering can, and an electrostatic generator inside, the cost of the whole equipment will not exceed 200.

That is to say, this equipment has basically met the conditions for large-scale promotion, but now there is a threshold, that is, whether the suspension can be sprayed.

No other experiments have been carried out before, but some other suspensions have been sprayed with this equipment, and the results are very average.

However, Professor Qin believes that there is no other room for improvement at present, because your powder coating team has not developed the corresponding products, so what the effect is now is actually unknown, and it is a waste of manpower and material resources to improve it now.

Unfavorable teaching is the most troublesome thing, and the experiment has just been carried out for less than a minute, and Zhang Xiaofan frowned.

"Hanging!"

I don't know which technician suddenly said these three words.

"It's too thin, Wu Wei, readjust it, increase the concentration of the powder coating by about 30%, and see what the effect is?"

Zhang Xiaofan's face is naturally not good, this can be said to be not a good beginning, in fact, the concentration of this suspension is already very high, but there will still be sagging, which proves that the proportion of powder coating dissolved in water is too small.

If you look closely, you will find some organic matter that can dissolve in water, such as sugar.

The more sugar dissolved in the water, the higher the viscosity of the whole water, especially when you heat, the whole sugar solution will become very viscous, at this time you use a spoon to lightly hit a spoonful, you will find that the whole sucrose solution will have a certain adhesion to the spoon.

But if you make some aqueous solutions that are insoluble in water, for example, if you use clay and soil in your aqueous solution, you will find that this aqueous solution does not produce any viscous feeling, but is still like water, which looks very "thin".

The same is true for the current powder coating solution, because although the powder coating was developed in this direction during the research and development, it still does not meet the requirements, so the whole solution now looks very "thin".

Therefore, when spraying, the aqueous solution of the powder coating will flow down slowly like water droplets, forming a very obvious water stain, and then most of the sprayed solution will hang down the bottom of the coated object, drop by drop.

"Try again, and the water has been reduced by 30%. ”

Zhang Xiaofan nodded, and then motioned to the operator with his eyes to continue the operation to see if it could succeed this time?

"It's very uneven......"

In an experiment, Zhang Xiaofan was even more helpless, and after increasing the concentration, there was a lack of uniformity, and there was still a phenomenon of sagging, but it was not as serious as last time.

This makes Zhang Xiao very annoyed, if this trend continues to be studied, then powder coatings can only develop in water-based coatings.

Don't go to the end, whether it is the various updates of raw materials or the various improvements in the production process, in the end, it may actually produce a coating similar to water-based paint, which is not what Zhang Xiaofan wants.

As a relatively senior paint technician, Zhang Xiaofan knows very well that the pollution of water-based paint will not be much less than that of paint, which is not what Zhang Xiaofan wants.

For the sake of cost, the air pressure will be small, and if the air pressure is small, there will be various problems, and the air pressure will be small in terms of dispersion, so it is impossible to form a high-pressure hedge, and there is no way to talk about making the uniformity of spraying very good.

"Why don't you add a small amount of organic solvent?"

Just when everyone fell silent, a very small voice muttered weakly, and then happened to be heard by Zhang Xiaofan again.

This is a compromise method, adding a relatively small amount of soluble organic solution, of course, the kind that can be soluble in water, so that the powder coating and the organic solution can be dissolved to a certain extent, thereby increasing the viscosity of the whole solution.

Of course, it is undeniable that this solution will definitely emit a small amount of organic solvent into the atmosphere, which is unavoidable, and this is what Zhang Xiaofan has to consider. You have to find the latest chapters by yourself to read books?