After finding out the current situation of the Lu family's meltblown fabric business, Gu Zhe started intensive R&D deployment work in the next few days, mobilized Tianyuan Technology's team to decompose scientific research tasks in a solid manner.

Of course, with Gu Zhe's style of doing things, the same thing: except himself, no other scientific researchers can master the overall idea. Until the final system is integrated, they don't know how much the work of other sub-project teams can ultimately play in the overall overall role.

Moreover, after a simple split, what Gu Zhe's Tianyuan Technology can finally provide is only patents on the composition, structure and principle of new materials. At most, some auxiliary material composition and distribution formulas required in the production process.

How to achieve specific processes and the corresponding transformation of meltblown machines requires Mingyuan International's R&D personnel, and Gu Zhe can only give advice.

After all, Mingyuan International's R&D personnel have been involved in the chemical fiber textile industry for more than ten years. The experience of various textile machinery and process organizations is definitely much better than Gu Zhe. Gu Zhe's ideas also require them to transform them into large-scale factory implementation.

All aspects soon began to move in an orderly manner. Lu Jinming and Lu Youyou also came to the company every day to watch the R&D progress. Gu Zhe immediately provided whatever he wanted and asked for it.

As mentioned earlier, the materials Gu Zhe was going to make this time were based on a paper in the scientific journal of the Institute of Nanotechnology, Chinese Academy of Sciences on June 26, 2020, and subsequent research and development in later generations.

This material is called "pva/plga one-way water-permeable adsorption fabric". It can add some elastic extension based on the adsorption and anti-toxic insulation properties of traditional meltblown fabrics, and at the same time achieve one-way water-permeable moisture-permeable, which is almost the same as the skin protection and permeable sweat-permeable effect of human body. It was also called "artificial skin" in later generations.

This material can also be used in meltblown machines during the production process, but the requirements for meltblown machines are much higher, and many other auxiliary equipment and multiple additional process links are required.

First of all, the nozzle of the meltblown machine must be thinner than the spinnerets made of polypropylene meltblown cloth. The spinnerets currently spray polypropylene may be more than hundreds of nanometers in thickness. The new nozzle must be thinner at most twenty or thirty nanometers in thickness, or even thinner.

Of course, this is not impossible to solve in principle. Whether it is to add a new and more precise filter to the nozzle or use other means, I believe that the production line process engineer can solve it.

This is nothing more than a balance between cost and performance. The thinner the spinneret, the lower the production efficiency of the meltblown machine and the smaller the daily output. The greater the loss of the nozzle filter, the wear and life of the supporting parts are also affected.

However, this matter can definitely be solved. In the end, how much more money is spent, it will be spread to the product price. So Gu Zhe immediately handed over this work to Mingyuan International engineers, and Lu Jinming also took them personally to survey the potential and improve the machine.

After solving the simplest spinneret refinement problem, the following is the key highlight.

Traditional polypropylene meltblown cloth sprays a single material, so it can be sprayed randomly. For example, the final finished fabric is 0.1 mm thick, then spray it on the condensed net curtain or the collection drum.

After spraying the surface of the collection drum, polypropylene filaments with an average thickness of about 0.1 mm have accumulated, then cool it for a while (the collection drum is rotating during the cooling process, and the surface of the drum is cold), and the cloth can be removed.

However, the "pva/plga one-way permeable adsorption fabric" that Gu Zhe wants to make cannot be sprayed so thick at one time, because if the hydrophilic pva and hydrophobic pva are stacked to a millimeter-level thickness and then overlap each other up and down, the effect of "pulling and adsorbing water molecules in the interlayer and allowing the moisture to evaporate from the inside out".

If a single layer of PV is too thick, the moisture will be pulled and locked in the middle. If a single layer of PV is too thick, it will completely block the pores that seal the water vapor through. If one does not let go and the other pushes out, the water permeability will not be achieved.

Therefore, Gu Zhe has to ensure that each layer of pva of the machine is sprayed to a maximum of microns, and the plga can only be sprayed to the microns to obtain the thickness, and then overlap it, and finally form the overlapping of pva and plga, similar to the structure of a thousand-layer cake.

If you want to mass-produce this kind of thing, the meltblown cost is much higher than that of a single material meltblown cloth, because it was originally sprayed with one spray, but now it may have to be repeatedly overlapped and sprayed many times.

The cost of occupancy of machines and hardware depreciation has increased greatly, resulting in the extremely expensive price of this fabric even if it is produced. After all, compared with ordinary meltblown fabrics, this new material occupies a dozen times the working hours of the meltblown machine, and there are other supporting complex processes.

Of course, the final performance of this fabric at the macro level does not have to be entirely composed of plga or pva. It can be composed of the inner and outer surfaces of these two materials overlap several times, and the main material that provides structural strength in the middle can be other organic chemical fiber fabrics as long as there is no obvious hydrophobicity or hydrophilicity tendency.

The final effect to achieve is to absorb water inward and send it into the sandwich layer. The outer layer drains water outward and draws it from the sandwich layer.

Similar to a Napoleon cake with a thousand-layer pastry on both sides and a cream-core in the middle - in short, the technical details are very complicated and it is difficult to accurately describe for laymen to understand.

Anyway, the key point is: Gu Zhe needs to find a way to make the meltblown layer that makes the plga and pva material layers thin enough, and to reduce the cost of repeatedly stacking meltblown to solve many of the process problems.

Spraying materials is not as easy as laymen to think about it, there are many difficulties here.

For example, in the current nozzle system, no matter how thin the sprayed thread is, it cannot directly ensure that the sprayed cloth layer is thin enough - thin silk is only a necessary condition for thin cloth, not a sufficient condition.

Another key necessary condition is the precise control of the trajectory of the spinneret. Because the thinner the wire, the more likely it is to float when it is sprayed out.

Even if the jet airflow is very strong, the direction of the spinneret cannot be accurately controlled, which involves extremely complex aerodynamics and fluid dynamics, and the jet airflow cannot be infinitely strengthened, otherwise the spinneret will be blown off.

When spraying a 0.1 mm thick cloth layer, it doesn't matter if the spinneret is floating around in a small range, because macroscopic perspective, as long as the amount is large enough, these random errors can be offset by each other.

Just like when experimenting with double-slit photos and gratings, you cannot determine from the quantum level where each light quantum finally shoots through the double-slit, but as long as there are enough photons, interference fringes will definitely form in the end.

The larger the quantity, the more the macro distribution conforms to the law of probability, which is well known. When the quantity becomes smaller, the accidental error will be highlighted.

Therefore, once the thickness of a single layer is reduced to the micron level, you will see that some places will become thick. Some places are thin, and some places are not even covered at all, so there is no way to talk about quality control.

And if Gu Zhe had not intervened in person, it would be almost impossible for other colleagues to solve this problem.

Gu Zhe was prepared for this. For this reason, he also brought Jin Can, who was engaged in chemical deposition, and several graduate students also began to develop mask materials specifically used to collect plga or pva light spray layers, under Gu Zhe's direction.

In normal meltblown links, the requirements for the rollers and condensing mesh curtains that receive finished products are very low. As long as the material of the rollers or mesh curtains does not stick to the hot melt fabric to be produced, and there is enough cooling water to allow the hot melt material to condense instantly as soon as it is sprayed onto the surface of the cooling barrel.

However, Gu Zhe added two additional requirements for the collection mask he needs to use:

He needs to ensure that the mask of the hydrophobic plga spray layer is sufficiently oleophilic and hydrophobic. Once the hot melt plga is sprayed, the oily adsorption force can be used to flatten and spread it as much as possible.

Similarly, when collecting the mask of the hydrophilic pva spray layer, it should be done the opposite, be sufficiently hydrophilic and oleophobic, and use the water-based surface characteristics to flatten the "uneven stacking" pva as much as possible.

In this way, by collecting the specific material of the film, the thickness error of the slightly thick meltblown can be further flattened by an additional order of magnitude.

Moreover, because the single meltblown layer is too thin and the material structural strength is too low, these single-layer materials cannot be collected directly from the drum before stacking, and they have to be rolled up together with the mask.

So Gu Zhe finally had to consider how to recycle the mask. The best way to think about it is of course "the melting point of the mask itself is better than that of plga and pva.

In this way, after the multi-layer plga and pva and mask are stacked together, it can be heated slightly. When the plga and pva do not melt again, the mask will be melted separately and flowed out and recycled, leaving only the composite cloth stacked by plga and pva".

Similar to when making Thousand Layers of Crisp, at the beginning, in order to prevent the dough layers from sticking together, you need to apply butter layer after the last layer is set and before entering the oven, you want to remove the ghee layer in the middle. (The example is not very appropriate, but you can't give a more appropriate example)

With so many complicated scientific ideas mixed together, it is difficult to understand a series of problems alone for 100 brains to ordinary earthlings who have not opened the perspective of God.

If Gu Zhe had not studied chemical deposition for many years in his previous life, he would not have been so slight.

When Gu Zhe split the relevant "chemical deposition mask" task and handed it over to Jin Can and the master's students he brought to do it alone, Jin Can was shocked when he saw this experimental design.

He had never expected that Mr. Gu’s understanding of material chemistry was so comprehensive that even the “chemical deposition method” that he had never used much, Mr. Gu’s thinking was so clear.

"How did you think of this experimental design idea? I have been studying liquid deposition for six years and have been studying thin film deposition. However, the industrial application of thin film deposition is not as profound as you."

Before he started to do something, Jin Can was completely impressed by Gu Zhe. Originally, he was just a doctoral student who loved money. Before coming to Gu Zhe, he always thought about "him "him's girlfriend forced him to buy a house early."

But at this moment, he was completely convinced and firmly believed that following Gu Zhe, buying a house in one year would be no problem. Based on Mr. Gu's ideas, if he continues to study this way, he will definitely achieve great results.

Although he is still ignorant of at least 70% of other technical key points of future achievements.

But if you look at the whole leopard, it will be enough to explain the problem as long as he understands his own professionalism.

Of course, Gu Zhe doesn't need to explain his source of knowledge.

When graphene first came out in later generations, in order to prepare graphene, many engineers and scientists also focused on the "thin film deposition method".

To put it bluntly, I hope to avoid "tearing tape" to mass-produce graphene, but I hope to directly give a film used to adsorb graphene. It is best that graphene can be spontaneously adsorbed on this film, and it is just fine, and only one layer of carbon atom thickness will be adsorbed at each exposed position.

Once a carbon atom falls at a certain position, there will no longer be a second layer of carbon atoms falling to the same point. This will ensure that the graphite produced is a single-layer atomic thickness, which is graphene.

Gu Che later generations were very proficient in "how to deposit graphite with only one atomic thickness on a specific film and molybdenum disulfide with only one molecular thickness".

After learning from the examples, look at the papers of the Institute of Nanotechnology, Chinese Academy of Sciences and learn how to "how to use the corresponding adsorption film to adsorb the plga and PV spray layers as thin and even as possible", isn't it easy?

Gu Zhe still has to tell you Jin Can the mystery of awe here? If you don’t understand, learn humbly! Learn while working!

After the project was completed, Gu Zhe believed that the significance was absolutely huge. It was not only as simple as creating new meltblown materials, but the key was that Gu Zhe must establish his academic status in the field of "chemical deposition method", especially the "gas phase thin film deposition method".

In the future, when he goes to Stanford to finish his research and prepare for graphene, he can only take out enough dry goods at once, rather than just an accidental scientific discovery of "tearing tape".

Gu Zhe wanted to do more and better than the scientists in history. When he discovered graphene, he immediately made the "How to use a copper ion mask to adsorb carbon atoms in methane gas, form copper ions and hydrogen ions to replace them, and obtain graphene with a thickness of a single layer of atoms."

After all, Gu Zhe's nationality is China, and he knows very well how difficult it is for Chinese to win the Nobel Prize in Physics than those in Western countries.

Westerners can "tear tape" and win the Nobel Prize when they accidentally discovered graphene, but Gu Zhe must prove that he "not only can he discover it, but also provides the first generation of non-contingent, and early laboratory scientific mass production methods that can also create graphene without tearing tape."

If even this is done, unless the foreigners are so shameless that they directly overturn the table and destroy the Nobel Prize and make the Nobel Prize extinction from then on, they will have to be forced to give the Nobel Prize to Gu Zhe.

Gu Zhe likes this kind of situation where the opponent doesn't like him and can't do anything about him.
Chapter completed!