More than a minute later, the nitrocellulose and nitroglycerine in the beaker were completely mixed, taking on a gray slurry form. The extremely sensitive nitroglycerin was no longer so sensitive. Yu Hua observed that the time was ripe, and then added the extremely expensive and rare nitroglycerine.
The dosage of neutralizing agent is 2%.
The scientific name of the centralizing agent is diethyl diphenyl urea. It is currently purely imported in China. The domestic chemical industry foundation is insufficient and cannot be produced.
This is an important ingredient in double-base drugs. It can eliminate and reduce the production of acidic oxidative decomposition products, prevent the decomposition of nitrate esters themselves, thereby improving chemical stability and extending storage time. Its uses are basically the same as diphenylamine, and it is strictly controlled by the government.
One of the strategic materials.
Just such a small bottle of 30 milligrams of neutralizing agent cost Yu Hua a full fifty yuan, equivalent to 5,000 RMB in later generations.
If calculated by kilogram, the price of one kilogram of medium dose is 830 yuan.
"This price may be nothing to Brother Zhongzheng, but to the Eighth Route Army, it is still quite expensive. Even if the Kodak-type double-base forcing agent with poor comprehensive performance is used, 1% of the centralizing agent will be used. It will be needed in the future.
Overcome the synthesis technology of diethyl diphenyl urea and dimethyl diphenyl urea." Yu Hua added the neutralizing agent and stirred, thinking about the neutralizing agent in his mind.
Laboratory preparation and industrial production are completely two concepts.
If you want to produce double-based propellants and double-based gunpowder on a large scale, the synthesis technology of the centralizer must be mastered.
Double-base powder is divided into gun powder and rocket propellant. Regardless of the latter for the moment, the former is divided into mortar powder and artillery powder. The two types of gunpowder are divided into Ballister type and Kodak type according to different production processes.
The Bart-type double-base drug uses a solvent-free process, and the Kodak-type uses a volatile solvent process. Later generations mainly use the Bart-type double-base drug, with a proportion of 2% of the medium and a Kodak-type one of 1%.
However, no matter which type of double-base gunpowder is produced, a stabilizer must be added during production. Diphenylamine, which is used as a stabilizer for gunpowder, is weakly alkaline and is not suitable for use in double-base drugs in the field of gunpowder.
A corresponding proportion of the neutralizing agent is added to the beaker, and a chemical reaction immediately occurs, dissolving in nitroglycerin, continuously penetrating into the nitrocellulose, and tightly adhering and combining, which is extremely strong.
Subsequently, Yu Hua added 0.3% Vaseline and stirred.
D-grade nitrocellulose 57.5%, nitroglycerin 40%, 2% centralizing agent, petroleum jelly 0.3%, graphite and a little moisture. This is the formula of Ba type double base medicine given by the boss of station B.
As the Vaseline blended into the nitrocellulose and nitroglycerine, a pale yellow slurry material soon appeared. If nothing else, this was a qualified quasi-finished bibase drug.
"It should be no problem. We'll be here today. The Ba type double base powder is ready, followed by the Kodak type double base powder, the Ba type gun powder and the Kodak type gun powder. Once these are done, as well as the centralizer synthesis technology, we can call it
Complete the systematic development of double-base drug technology in a true sense..." Yu Hua carefully observed the slurry in the beaker and confirmed it was qualified. He raised his right hand and looked at the time. It was already five o'clock in the afternoon. He turned to look at Xu Rui on the other side.
.
At this time, Xu Rui, who was still preparing the second batch of single base drug, had reached the final step. He was cautious and focused. He added the A-grade nitrocellulose into the beaker and continued to stir. The operation method was a little stiff, but it was better than the standard.
After observing for a while, there was nothing wrong. Yu Hua did not disturb Xu Rui and went about his business.
Record the detailed experimental steps and processes of the double-base gunpowder. The gunpowder is extruded and granulated, and sent to the kitchen for drying. The extremely dangerous nitroglycerin is returned to its original location, waiting for the next double-base gunpowder to be prepared and used.
After finishing the work, good news came from Xu Rui. The second single-base propellant was successfully prepared.
"Sir, Ruizi is ready." Xu Rui pushed away, wiped the sweat from his forehead, and said to Yu Hua.
There was a hint of joy and excitement in his words.
This is the joy of mastering a technology.
A family with millions of dollars is not as good as possessing a skill. Xu Rui fully understands the meaning of the skill he has mastered, and he also understands how precious and hard-won it is.
How could he have learned such a powerful skill without his husband?
This is a new type of gunpowder!
"Good job. Let's dry the granulation first." Yu Hua reminded with a smile.
With a smile on his face, Xu Rui nodded quickly, calmed down, picked up the metal screen, placed the quasi-finished single base drug on it, squeezed and cut it into particles, and then fired a kilogram of multi-granular wet single base drug.
Take the medicine and bring it to the kitchen.
Yu Hua waited for Xu Rui to come out of the kitchen after finishing his work, and then said: "Ruizi, that's it for today. I'll go to Tsinghua Park first. You stay in the laboratory and be responsible for packing this batch of propellants. You must pay attention to safety. If you don't understand anything,
Just ask, don’t pretend to understand if you don’t understand.”
Today is Friday, after a busy afternoon, he has to go to Tsinghua University to attend classes. He has already started mathematical analysis, and the thinking finite element analysis system is close at hand, so there is no room for any delay.
"Ruizi understands and must guard the laboratory." Xu Rui nodded.
Yu Hua smiled, said nothing more, then put on his schoolbag, turned around, left the chemistry laboratory, and embarked on the road to Tsinghua University.
In the afternoon, the sun sets.
The sky is filled with red clouds in the distance, winter is passing and spring is passing, and the hot summer is coming.
Today, there are 89 days left until July 7th.
…
Tianjin, the northern suburbs of the city.
Two young men dressed as ordinary people were walking through the mountains and forests along the narrow path. Their pace was steady and fast, their bodies were agile, their waists were bulging, and they had hidden weapons.
Not far away, there is a railway that stretches into the distance - the Jinshan Railway.
The Jinshan Railway starts from the Tangxu Railway and runs from Tianjin City to Shanhaiguan. The length is about 300 kilometers. This is the only railway line north of Tianjin City and is actually controlled by the Japanese army.
"Sir Li, Tangshan is another forty miles away. We have found no trace of large-scale Japanese military activities along the way." During the walk, a young man was sweating on his forehead and looked at the mountains not far away.
Iconic landform, he said to Chief Li who was in charge of the operation next to him.
"Forty miles of land..."
Li Ping frowned, his eyes were solemn, and he instinctively glanced at the Jinshan Railway line on the right.
Along the way, starting from Tianjin City and along the Jinshan Railway, no trace of large-scale Japanese military activities was found. Whether it was marching or taking a train, there was no trace of Japanese regiment-level troops.
Now, two full days have passed since April 7th.
what happened?
Could it be that there was an error in deciphering the information?
Li Ping was puzzled. Since he left Tsinghua University last time, the Blue Clothes Secret Service immediately carried out deciphering work according to the red secret matrix mathematical model and calculation formulas, deciphering a large number of high-value Japanese military messages.
However, in order to verify the authenticity of these messages and the effectiveness of the red secret deciphering, the Secret Service specially deployed controls and fortifications in the north of Tianjin based on the most valuable piece of information to strengthen surveillance and observation of Japanese troops in an attempt to discover the Third Division.
The figure of the sixth regiment.
However, two days passed, and this vanguard of the Greater East Asia War did not appear.
The situation seemed particularly strange.
Was there an error in the red secret deciphering data, or did the Japanese know that the encryption system had been cracked and take immediate measures?
have no idea.
"Look again and keep moving forward." Li Ping, the station guard, took a deep breath, kept his emotions, kept a cool head, and his eyes were clear, and responded.
He chose to believe Professor Hua Luogeng and classmate Yu!
As the main road from Tianjin to Shanhaiguan, the Jinshan Railway is the only choice for the Japanese to transport large-scale troops. The mobilization of more than 3,000 regiment-level troops is required to arrive secretly. The other side will never march in the wild with great fanfare and will definitely use the railway.
Wire.
Where is the Sixth Regiment?!
I have updated more than 5,000, which is a few hundred short of the 6,000 in Chapter 3. I will make up for it tomorrow and go to bed.