Once there is a research direction, Zhang Xiaofan's speed is beyond the reach of many people, because many theories are still only in the theoretical stage in the current coating industry, but Zhang Xiaofan can use some bits and pieces in his memory, and then piece together into actual technologies and formulas that can be applied.

"Let's gather here. ”

Zhang Xiaofan still only has a preliminary idea, how to adjust the formula, how to add or reduce some raw materials, these need to be verified by experiments.

The birth of a new product goes through thousands or hundreds of experiments, which is not something that can be done by one person, so it takes a team.

"Professor Qin and I had an exchange just now, and we have an idea.

Although we are powder coating, there is a way of spraying our coating that we basically can't see and can't touch.

That is, the powder coating is made into a suspension with water as the carrier, and then sprayed in the form of paint, which can completely eliminate dust pollution.

However, my requirements are very strict, the first one is only allowed to use water as a solvent, and any other solvents are not allowed to be added.

That is, the composition of this suspension can only be powder coating and water.

But as any technician, we all know that powder coating is not easy to water at all, so how do we solve this problem, can make the powder coating temporarily or long-term suspension in the aqueous solution.

This is something we need to address in the future.

So you put down some of the projects in your hands for the time being, and we will collectively tackle the problem and solve this problem, and I will throw bricks and stones to share some of my thoughts today. ”

Zhang Xiaofan's words made some of the more than a dozen people feel very much, they all came out of the head office, and they knew that Zhang Xiaofan was going to say some dry goods again.

Every time Zhang Xiaofan taught, they could feel that there were some problems, and suddenly they were sudden.

Powder coating, as a technician, you want to progress, the most important thing is not how to adjust the color of the formula, but how to complete your own technical system, you have to fundamentally understand the powder coating, so that you can modify the composition of the formula, sometimes a little bit of adjustment, even if it is 1%, you can feel that the performance of powder coating has undergone some great changes.

Zhang Xiaofan plays such a role, which can make your knowledge system more perfect, because what Zhang Xiaofan said is never something trivial, but can let you fundamentally understand powder coatings.

Therefore, these people are very much looking forward to it, whether it is for the future upward space, or for themselves to find another person in the future, it is of great significance.

Two people even took out a notebook, ready to record some key information, such an attitude made Zhang Xiaofan very recognized, and a good memory is better than a bad pen.

"My requirement was that our products would be slightly soluble in water.

First of all, the powder coating we are going to develop must be able to form a suspension with water, or it can form a suspension for a short time, and it must not settle immediately.

The first thing we need to consider is the ratio of the size of the hydrophilic group to the non-hydrophilic group.

And when I was communicating with Professor Qin, this powder coating was dealing with our exterior wall paint and interior wall paint.

So you have to think about the length of the chain and how it solidifies.

The curing method must be simple, of course, it is best to be able to cure a part, or to promote curing through the second spraying accelerator, these are okay, but if you can try to complete the spraying at one time, do not spray the second time.

I write a formula, and you refer to my formula for minor adjustments, or use the principles of this formula to find a formula structure that you think is more reasonable. ”

Zhang Xiaofan picked up the pen and paper, spread it on the table, and wrote slowly, more than a dozen technicians quickly surrounded him, staring at the paper without blinking and watching Zhang Xiaofan quickly complete the formula.

Zhang Xiaofan's mathematical formula is very simple, that is, it is a very general formula, but it is marked afterwards, the specific molecular weight and the molecular weight range of the curing agent, as well as the end groups of polyester and curing agent, which must be hydrophilic groups.

In fact, the end groups of ordinary polyester used in the industry are hydrophilic groups, but because its molecular weight is too large, its hydrophobic part is too large, so the main material polyester is completely insoluble in water.

Therefore, Zhang Xiaofan's requirement is that everyone can find polyester manufacturers through their own industry relationships and develop some polyesters that can be slightly soluble in water.

In the process of making powder coatings, the smaller the particles, the easier it is to hover in the aqueous solution, but if the particles are too small, then the cost of production and the control of particle size will be very problematic.

So which range is the most appropriate, it takes a lot of experimentation, and that's what these dozen technicians should do.

After Zhang Xiaofan finished arranging these things, he slowly began to do some experiments himself, but not for the arrangement just now, but to see if there was any possibility of realizing some ideas in his heart.

The curing of powder coating has always been a very energy-intensive curing method, and in 11 years, there have been no ultra-low temperature curing products, and the lowest ones have reached more than 130 degrees.

The curing of powder coating can not be directly baked with fire, but the air needs to be heated to more than 130 degrees, and then the coated object is exposed to high temperature air and slowly heats up, when the temperature of the coated object reaches 130 degrees, the powder coating will slowly cure.

So this is powder coating, the biggest obstacle to thousands of households.

Zhang Xiaofan's current idea is to spray twice, and the powder coatings sprayed for the first time will not react at room temperature, no matter what method is used to spray the substrate.

Therefore, the substance sprayed for the second time is similar to a catalyst, and various catalysts can make the powder coating react at room temperature, and the reaction rate may be relatively slow, or the reaction will not be very complete.

It is obviously too early to say that these problems are a bit premature, and how to make the powder coating react at room temperature, even if the reaction is less than 5%, is a very big problem.

The paint can be partially reacted at room temperature, but certainly not completely.

Therefore, how to break through this technical difficulty is what Zhang Xiaofan wants to consider the most at present, and the thing that should be considered the most. You have to find the latest chapters by yourself to read books?