Reborn I want everything

Chapter 126 Extreme Brain Burn
After figuring out the status quo of the Lu family's meltblown cloth business, Gu Zhe started intense R&D and deployment work in the next few days, mobilizing Tianyuan Technology's team to break down scientific research tasks in a down-to-earth manner.

Of course, with Gu Zhe's style of doing things, it's still the same sentence: Except for himself, none of the other researchers can grasp the overall thinking, and until the final system integration, they don't know that the work of other sub-project teams will eventually be integrated into the overall situation. How much does it work.

Moreover, after a simple dismantling, what Gu Zhe's Tianyuan Technology can finally provide is only patents on the ingredient formula, structure, and principle levels of the new material.Add at most some excipient ingredient formulas required in the production process.

As for how to realize the specific process and the corresponding transformation of the melt blown machine, it needs the research and development personnel of Mingyuan International to realize it, and Gu Zhe can only give advice.

After all, the research and development personnel of Mingyuan International have been involved in the chemical fiber textile industry for more than ten years, and their experience in various types of textile machinery and process organization must be much better than Gu Zhe's. Gu Zhe's thinking also needs them to be transformed into large-scale factory implementation .

All aspects quickly began to move in an orderly manner. Lu Jinming and Lu Youyou also came to the company every day to watch the progress of the research and development. Gu Zhe immediately provided whatever he wanted, and whatever he asked for.

As mentioned earlier, the material that Gu Zhe will make this time is based on a paper published in the journal "Science" by the Nano Institute of the Chinese Academy of Sciences on June 2020, 6, as well as subsequent research and development by later generations.

This material is called "PVA/PLGA one-way water-permeable adsorption fabric", which can add some elastic extension on the basis of the traditional melt-blown cloth's anti-virus and heat-preservation properties, and at the same time achieve one-way water and moisture permeability, which is similar to the skin of the human body. The protective effect of perspiration is almost the same, and it is also called "artificial skin" in later generations.

In the production process of this material, a melt blown machine can also be used, but the requirements for the melt blown machine are much higher, and many other auxiliary equipment and multiple additional process links are required.

First of all, the nozzle of the melt-blown machine should be finer than the current spray of polypropylene melt-blown cloth. The current spray of polypropylene may be hundreds of nanometers thick, and the new nozzle should be only two or three at most. Ten nanometers finer, or even finer.

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 the production line process engineer can solve it.

This is nothing more than a matter of balancing cost and performance. The finer the filament, the lower the production efficiency of the melt blown machine and the lower the daily output.The greater the loss of the nozzle filter, the wear and tear of the supporting parts, the service life will also be affected.

However, this matter can definitely be resolved, and how much money is spent in the end can be spread on the product price.Therefore, Gu Zhe handed over this job to Mingyuan International's engineers immediately, and Lu Jinming personally took them to find out the potential and improve the machine.

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

The traditional polypropylene melt-blown cloth is sprayed with a single material, so it can be sprayed randomly. For example, if the final finished fabric is 0.1mm thick, then spray it on the condensation net curtain or the collection roller.

After spraying to the surface of the collection drum, the polypropylene filaments with an average thickness of about 0.1 mm have accumulated, and then cool down 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.

But the "PVA/PLGA one-way water-permeable absorbent fabric" that Gu Zhe wants to do can't be sprayed so thick at one time, because if the hydrophilic PVA and hydrophobic PLGA are stacked to a thickness of millimeters, and then overlapped together , the effect of "drawing and absorbing the water molecules in the interlayer, and letting the water be pulled and volatilized from the inside to the outside" will not be achieved.

If the single layer of PVA is too thick, the moisture will be pulled and locked in the middle, and if the single layer of PLGA is too thick, it will completely block and seal the pores through which water vapor passes.If one is not let go and the other is pushed outward, the water-permeable effect will not be achieved.

Therefore, Gu Zhe had to ensure that each layer of PVA on the machine was sprayed to a thickness of micron at most, and PLGA could only be sprayed to a micron level to obtain a thickness, and then overlapped, and finally formed a layer of PVA and PLGA overlapping, similar to a lasagna structure .

If this kind of thing needs to be mass-produced, the cost of melt blown is much higher than that of a single material melt blown cloth, because it was sprayed once, but now it may have to be sprayed repeatedly many times.

The cost of machine occupancy and hardware depreciation will also increase greatly, resulting in that even if this kind of fabric is produced, the price will be extremely expensive.After all, compared with ordinary melt-blown cloth, this new material will take up tens of times more man-hours for the melt-blown machine, and there are other supporting complex processes.

Of course, the final performance of this kind of fabric at the macro level does not have to be completely composed of PLGA or PVA. It can be just that the inner and outer surfaces are made of these two materials overlapping 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 hydrophobic or hydrophilic tendency.

The final effect to be achieved is that the inner layer absorbs water and sends it into the sandwich layer.The outer layer drains out and is drawn from the sandwich layer.

Similar to a Napoleon cake with thousand layers of meringue 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 it for laymen to understand.

Anyway, the key point is: Gu Zhe has to find a way to make a melt-blown layer that can make both PLGA and PVA material layers thin enough, and reduce the cost of repeated stacking of melt-blown, and solve many of the process problems.

Thinning materials is not as easy as laymen think, and there are many difficulties in it.

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

Another key requirement is the precise control of the spinning trajectory of the spinnerets.Because the thinner the silk, the easier it is to float when it is sprayed out.

Even if the jet airflow is very strong, it is impossible to precisely control the direction of the spinneret, which involves extremely complicated aerodynamics and fluid dynamics, and the jet stream cannot be strengthened infinitely, otherwise the spinneret will be blown off.

When spraying a cloth layer with a thickness of 0.1 mm, it doesn’t matter if the spraying wire drifts in a small area, because macroscopically, as long as the amount is large enough, these random errors can cancel each other out——

Just like the photon double-slit experiment and the grating experiment, you can’t determine where each photon will finally shoot through the double slit from the quantum level, but as long as there are enough photons, interference fringes will definitely be formed in the end.

The larger the amount, 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.

So once the thickness of the single layer is reduced to the micron level, some places will appear thick if you spray randomly.Some places are thin, some places are not covered at all, and quality control is out of the question.

And this problem, without Gu Zhe's personal intervention, it is almost impossible for other colleagues to solve this problem.

Gu Zhe was already prepared for this.For this reason, he also brought Jin Can, who was engaged in the chemical deposition method, and several graduate students, under the direction of Gu Zhe, began to develop mask materials specially used to collect PLGA or PVA thin spray layers.

In the normal melt-blown process, the requirements for the finished product roller and coagulation mesh curtain are very low, as long as the material of the roller or mesh curtain will not stick to the hot-melt fabric to be produced, and there is enough cooling water inside to let the heat As soon as the molten material is sprayed on the surface of the cooling cylinder, it will condense instantly, and it will be fine.

However, Gu Zhe added two additional requirements for the collection mask to be used now:
He needs to ensure that the mask for collecting the hydrophobic PLGA spray layer is sufficiently lipophilic and hydrophobic. Once the hot-melt PLGA is sprayed over, it can use the oily adsorption force to flatten and flatten the originally "unevenly stacked" PLGA as much as possible.

In the same way, the mask for collecting the hydrophilic PVA spray layer must be done in the opposite direction, sufficiently hydrophilic and oil-repellent, and the "unevenly stacked" PVA should be leveled as much as possible with water-based surface properties.

In this way, relying on the specific material of the collection film, the thickness error of the micro-thick meltblown can be further flattened by an additional order of magnitude.

Moreover, because a single melt-blown layer is too thin and the structural strength of the material is too low, these single-layer materials cannot be collected directly by rollers before being stacked, and have to be rolled together with the mask.

So Gu Zhe finally had to consider how to recycle the mask. The best way was of course "The melting point of the mask itself should be much lower than PLGA and PVA.

In this way, after the multi-layer PLGA, PVA and mask are stacked together, it can be heated slightly, and the mask can be melted separately without the PLGA and PVA melting again, and the flow out can be recycled, leaving only the PLGA and PVA stack composite cloth".

Similar to when making mille-feuille, at the beginning, in order to prevent the dough layers from sticking together, you need to spread ghee layer by layer.But after the last layer is finalized and before entering the oven, I hope to remove the ghee layer in the middle. (The example is not very appropriate, but I can't give a more appropriate example)
With so many convoluted and complicated scientific ideas mixed together, it is difficult for ordinary people on earth without God's perspective to figure out a series of problems alone with 100 brains.

If Gu Zhe hadn't studied the chemical deposition method for many years in his previous life, he wouldn't be so light-hearted.

……

When Gu Zhe split up the task of "chemical deposition mask" and handed it over to Jin Can and the graduate students he brought to do it, Jin Can was shocked when he saw the experimental design.

He never expected that Mr. Gu's understanding of material chemistry is so comprehensive, and even the "chemical deposition method" that he has never used before, Mr. Gu's thinking is so clear.

"How did you come up with this experimental design idea? I have been studying liquid phase deposition for six years, and I have also dabbled in thin film deposition, but the industrial application of thin film deposition is not as profound as yours."

Before starting to work, 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 "his girlfriend forced him to buy a house earlier".

But at this moment, he is completely convinced, and firmly believes that following Gu Zhe, buying a house in a year is by no means a problem.In Mr. Gu's way of thinking, if this research continues, great results will definitely be achieved.

Although, he is still ignorant of at least [-]% to [-]% of the technical points of the future major achievements.

But to see the whole leopard from a glimpse, he only needs to understand this one spot of his own professionalism to explain the problem.

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

When graphene first came out in later generations, many engineers and scientists also focused on the "thin film deposition method" in order to prepare graphene.
To put it bluntly, I want to avoid "tearing tape" to mass-produce graphene, but I hope to directly provide a film for absorbing graphene. It is best that graphene can spontaneously adsorb on this film, and it should be just right. Each exposed site is adsorbed only one carbon atom thick.

Once a carbon atom falls on a certain position, there will be no second layer of carbon atoms falling on the same point, so as to ensure that the graphite that comes out is a single layer of atomic thickness, which is graphene.

Gu Zhe is very proficient in "how to deposit only one-atom-thick graphite and only one-molecular-thick molybdenum disulfide on a specific film".

By analogy, look at the relevant papers of the Institute of Nanotechnology, Chinese Academy of Sciences, and learn "how to use corresponding adsorption films to absorb PLGA and PVA spray layers as thinly and uniformly as possible", isn't it easy?
Does Gu Zhe need to tell you about the profound meaning of reverence here?If you don’t understand, learn obediently and humbly!Learn by doing!
After this project is completed, Gu Zhe believes that the significance is absolutely huge. Not only is it as simple as creating new melt-blown materials, but the key is that Gu Zhe must establish himself in the "chemical deposition method", especially the "vapour-phase thin film deposition method". "Academic standing in the craft field.

In the future, when he goes to Stanford to finish his research and is ready to produce graphene, he will be able to produce enough dry goods at one time, not just an accidental scientific discovery of "tearing tape".

Gu Zhe has to do more and better than those few shady and raped scientists in history, and even when he discovered graphene, he immediately worked out "how to use a copper ion mask to absorb carbon atoms in methane gas and form Copper ions and hydrogen ions are replaced to obtain graphene with a single layer of atomic thickness."

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

Westerners can "tear the tape" and get the Nobel Prize for accidentally discovering graphene, but Gu Zhe has to prove that he "not only can discover, but also provide the first generation of non-accidental early experiments that can produce graphene without tearing the tape." Laboratory scientific mass production method".

If even this is achieved, unless the foreigners are so shameless that they directly overturn the table and abolish the Nobel Prize, making the Nobel Prize extinct from now on, otherwise 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.

And all of this right now is just a pawn in Gu Zhe's big game of chess. It seems very reasonable and unobtrusive for him to establish an opportunity to set foot in the field of chemical deposition method for the first time, and he can actually make a lot of money by the way.

(End of this chapter)