Xu Qiang just slept in the guesthouse for one night. The next morning, just after he came back from breakfast, he was notified to go to the office building for a meeting at 9:30.

When he arrived at the conference room on the second floor of the Fifth Ministry of Machine Building, the scene before him shocked him.

At this time, the conference room was already full of people, some wearing Zhongshan suits, some wearing military uniforms, and Minister Zhang Zhen was sitting in the middle, with Secretary Luo taking notes behind him.

"Comrade Xu Qiang, please sit down!" After seeing Xu Qiang, Zhang Zhen smiled and motioned for him to sit down.

For a moment, everyone's eyes were focused on Xu Qiang, and everyone's face showed more or less surprise.

"Let me introduce to you all. This is Comrade Xu Qiang, who successfully developed aramid paper. He is currently a technician at Jiangxi 9304 Factory..." Zhang Zhen began to introduce Xu Qiang to everyone.

"Minister Zhang, are you sure Xu Qiang is the person in charge of the research and development of aramid paper?" asked a middle-aged man in military uniform sitting next to Zhang Zhen.

"Commissioner Hou, Xu Qiang is indeed the person in charge of the aramid paper project. This has been verified by our department." Zhang Zhen said seriously.

"Forehead."

Hearing this, everyone at the scene looked at Xu Qiang with even more shock. They obviously did not expect that the project leader who successfully developed aramid paper was so young.

"Which school did Comrade Xu Qiang graduate from? Who is the substitute professor?" Commissioner Hou continued to ask.

Member Hou, whose real name is Hou Rui, is a standing member of the Science, Technology and Equipment Committee of the Central Military Commission and a top domestic materials expert. In his early years, he was responsible for the research and development of two product projects, high-temperature resistant dry film lubricant and talc-filled abradable coating primer, which won the second and third prizes of the National Science and Technology Progress Award respectively. He is also the deputy director of the 402 Institute of the Second Ministry of Machine Building.

"Xu Qiang is self-taught. He took over the factory last year. At that time, he only had a junior high school education. He has now been admitted to the TV University and is studying in Shanghai organized by his unit," Zhang Zhen introduced.

"Junior high school education……"

Zhang Zhen's words were like dropping a bombshell in the conference room, shocking everyone.

You should know that those currently sitting in the conference room include experts and leaders from the PLA National Defense Science and Technology Commission, the National Defense Industry Office, the Science and Technology Equipment Commission, and the First and Fifth Ministry of Machine Building's directly affiliated research institutes. They can be regarded as the country's top experts in mechanical and chemical materials.

The success of the previous aramid paper project has caused a huge sensation in the BJ military technology circle, because this is a key high-tech material related to military and aviation, especially for the current aerospace field, it is a vital product technology.

Compared with other cities in the country, the capital's science and technology circle is quite active. Various scientific and technological exchange activities are held throughout the year. In addition, there are also various small-scale academic exchange conferences in the same professional field. The atmosphere of the activities is also quite good.

This time, the Fifth Ministry of Machine Building is preparing to launch a project for the mass production technology of aramid paper, which is qualitatively a national-level scientific research project. According to past practice, some top experts from BJ will be invited to hold a project work meeting.

In fact, whether this working meeting is held or not will not have any impact on the establishment of this project. The main purpose of choosing to hold such a meeting is still technical exchange.

Many national scientific research projects nowadays are comprehensive projects that are difficult to be completed by one professional technician. They require the cooperation of technicians from multiple disciplines and professions to be completed.

The participants are all top experts in the country. Most of them are currently responsible for projects, and some are even the heads of several technical projects at the same time. They have extensive qualifications and influence in the country.

So Zhang Zhen called them together, hoping that these experts could provide some valuable suggestions and opinions to Xu Qiang's project and solve the difficulties Xu Qiang might face in entering research and development.

Moreover, Zhang Zhen had another intention in asking Xu Qiang to attend the meeting this time, which was to allow Xu Qiang to quickly integrate into the circle of top domestic professional and technical elites and have his talents recognized by the BJ scientific and academic community, so that he could receive strong support and help in future research and development work.

"We Chinese have an old saying, 'It's not about where a hero comes from.' Actually, Xu Qiang is currently a student at the University of Electrical Engineering. Although he is young, when he was working in the factory before, he had served as a project leader many times and successfully developed excellent military products. So there is no need to question his ability." Zhang Zhen saw that the people at the scene were looking at Xu Qiang with some doubt in their eyes, so he interjected.

"Comrade Xu Qiang, you have successfully developed aramid paper. So what ideas and plans do you have for the mass production of aramid paper?" At this time, an old man opposite Xu Qiang asked.

"In fact, before developing aramid paper, I had already considered the technical plan for mass production of this kind of aramid paper." Xu Qiang glanced at everyone and continued, "During the period when I was developing aramid paper, I faced two very big difficulties. One was the precipitation and fiberization process of the mixed solution. A very critical point in this process is that the process is greatly affected by the stirring speed. The increase in stirring speed will increase the aspect ratio of the short fibers. The fiber length obtained is 1~50mm and the diameter is 2~100um, which is a relatively ideal fiber size. If it is just a small-scale trial production, the stirring speed and temperature are relatively easy to control. But if it is large-scale production, due to the increase in the volume of the tank and the increase in the amount of solution, it will make the temperature extremely difficult to control accurately, and the stirring is prone to unevenness, which will affect the results of the fiberization process..." Facing these top domestic experts, Xu Qiang directly began to talk about the core difficulties of the technology.

What Xu Qiang said were actually the technical bottlenecks he encountered when he was involved in the research and development of aramid paper in his previous life. In fact, he already had solutions to these problems. The reason why he brought them up for discussion was mainly to let everyone present see his level of chemical expertise.

Sure enough, after hearing what Xu Qiang said, Minister Zhang Zhen's eyes suddenly lit up, and the other people present immediately began to think.

"Are you using a stand mixer or a drum mixer?" a mechanical expert asked after a moment.

"Vertical."

"The vertical mixer has a small capacity, so use a drum mixer instead." The expert thought for a moment and then said, "Also, what is the heating temperature required for this process?"

"The temperature of the front-end process is 80~85℃, and the temperature of the back-end process needs to reach 220~235℃." Xu Qiang said.

"If the temperature is below 100°C, steam heating can be used. This method has a very low cost and good heating effect. If the temperature is above 100 degrees, there are many options, usually electric heating. If the process requires operation at high temperature or you want to avoid using a high-pressure heating system, you can use other media to replace water and steam, such as mineral oil and liquid lead. The boiling points of these media are all above 260°C, which fully meets your process requirements..."

"In fact, you can also use diphenyl ether mixture and molten salt as the medium. The boiling points of these two substances are also very high, and they heat up relatively quickly." Another expert added.

"Xu Qiang meant that the solution needs to be able to quickly and evenly control temperature, which requires some modifications to the drum. High-temperature corrosion-resistant 301 or 303 stainless steel can be used as the conduit material..."

All of a sudden, many experts in the conference room began to give their own solutions to the questions raised by Xu Qiang.

It has to be said that these experts are of very high level and have rich experience. After almost one round of discussion, Xu Qiang had already recorded more than 20 design plans.

"There is also the problem of cutting aramid fibers. In order to make aramid paper, it is necessary to ensure that the aramid fibers maintain a certain length after precipitation. However, aramid fibers are relatively strong, and ordinary crushing equipment cannot cut and crush them at all. This is also a problem that needs to be solved in our project." Xu Qiang then raised the second technological difficulty that needed to be solved.

"So what is the strength parameter of this aramid fiber?"

"The density of aramid fiber is about 1.44g/cm, which is slightly larger than water but much lower than metal. It also has a high elastic modulus, usually above 230GPa..." Xu Qiang said after a moment of hesitation.

"230Gpa!?"

When everyone present heard the parameters reported by Xu Qiang, they were immediately shocked.

Megapascal is a unit of pressure, commonly used to measure the strength of a material.

The elastic modulus of common steel is 190Gpa. The best quality 45 steel is 203Gpa, and Xu Qiang proposed that the modulus of aramid fiber is 230Gpa, which means that its strength is much stronger than that of high-quality carbon steel. It is really difficult to crush and cut such a strong material!
For a moment, the scene became silent, and no one could immediately come up with a solution.

In fact, in his previous life, in order to be able to cut and crush aramid fibers, Xu Qiang's team took a long time to overcome this difficulty, and the related equipment abroad was also very expensive. With the current domestic level of machinery and materials, it is indeed very difficult to solve this problem.

"Xu Qiang, how did you cut the aramid paper you made?"

After a moment, Zhang Zhen broke the silence and couldn't help asking.

"In fact, the aramid fiber I made was not cut..."

"Huh?" Everyone was stunned when they heard this.

"It's like this... Actually, the aramid fibers I made by the precipitation method are of different lengths after drying. But in fact, this kind of fiber can also be made into aramid paper by hot pressing. However, the strength of this kind of aramid paper is definitely much worse than that of aramid paper made from cut fibers." Xu Qiang paused, and then said: "I have compared the various parameters of the aramid paper I made with the public information of aramid paper abroad. In terms of strength, the difference is about 20%. I think this difference is caused by the fact that the fibers have not been cut..." (End of this chapter)