When Chen Fei checked the equipment, he found that Lin Yuan did not issue special mountaineering boots for the mountain infantry, what they were wearing now were ordinary boots, the bottom was sewn with leather, the leather was relatively soft, and people were very uncomfortable stepping on crampons, and it was uncomfortable to walk, how could they fight!

Mountain infantry boots are different, because the higher the altitude the temperature, so mountain combat often means snow combat, the bottom of the boot needs to be equipped with crampons, crampons are very similar to the spike shoes worn by modern football players, except that the nails on the crampons are sharper and stronger, which can help the infantry to grip the ice.

Crampons are made of low-carbon steel with good toughness and hardness, and the arsenal in the industrial zone can be manufactured, but crampons have a problem that cannot be solved by metallurgical technology: steel is a good conductor of heat, and the speed of heating and cooling down when exposed to heat is very fast, and the heat on the soldier's feet will continue to leave the body through it, and the feet are very prone to frostbite, so the mountaineering boots should also consider the problem of keeping warm. So Chen Fei found Lin Yuan and said his request: "We must change to special hiking boots, and we must solve the problem of keeping warm." ”

Lin Yuan said: "This is no problem, when the petrochemical plant produces rubber, we can use hard rubber to make the soles, modern hiking boots are also like this, the problem of keeping warm, how do you Marines solve it?" ”

Chen Fei said: "Generally, wool insoles and wool socks are distributed, and wool can keep warm in both wet and dry conditions, which is an excellent material for mountain warfare." ”

Lin Yuan said: "Wool? Wool is a rarity in this era, and I can only guarantee you two pairs of wool socks each. Chen Fei said: "What about the insoles?" Without insoles, soldiers' feet are also prone to frostbite. ”

Lin Yuan thought for a while and said, "I thought of a very good material that can be used to make insoles, and it is very easy to obtain." ”

Chen Fei asked, "What's that?" ”

Lin Yuan pointed to his head and said with a smile: "That's hair!" Do you know that during World War II, Nazi Germany took the hair in the barber shop to make knitted products, including insoles woven for mountain infantry. ”

Chen Fei said: "This is a war, if you are not careful, you will have no life, how can you have so many worries, there is nothing to do, you can rest assured to use your hair as an insole." ”

Lin Yuan immediately began to collect hair, and after publicity, many girls cut off their long hair to support the troops, what Lin Yuan didn't expect was that cutting hair also contributed to the change of customs in the future.

In order to make the troops move quickly, the Russians bought a large amount of rubber, and the rubber of this era has not yet been able to achieve chemical synthesis, so there is only natural rubber, and natural rubber can only be produced by rubber trees in Brazil, which was discovered by Western colonists and widely planted in tropical colonies, so in this era, several Western powers monopolized rubber production.

The Russians took it for granted that Lin Yuan's troops had no rubber, and they despised the combat effectiveness of Lin Yuan's troops, and they didn't care at all that they had been beaten to the ground, what they didn't expect was that Lin Yuan had mastered the most advanced rubber synthesis process.

The process of synthetic materials, including reaction equipment, catalyst types, reaction temperature, pressure, etc., cannot be calculated according to certain formulas, they are obtained by the exploration of generations of producers, Lin Yuan does not need to try these things again, he can use organic chemicals, produce rubber, propellants, explosives, and turn it into a secret weapon against the Russians.

With the efforts of experts, the process of oil drilling is very smooth, a large amount of oil is transported into the petrochemical plant through pipelines, heated in the petroleum fractionation tower, the composition of oil is very complex, including benzene and benzene derivatives, liquid alkanes, the boiling point of different components is different, so the order of evaporation is different, when heating, the oil of different components is separated, gasoline, diesel, lubricating oil and so on can be obtained separately. Some of these components are used as fuels, and some are used as raw materials for the synthesis of other products, such as light diesel, after desulfurization treatment, enter the tubular cracking furnace, in the furnace, the chemical bonds between the carbon atoms in the alkanes are broken at high temperatures, and the long-chain alkanes are gradually transformed into short-chain alkanes, and at the same time, the chemical bonds between carbon atoms and hydrogen atoms are also broken, and the alkanes gradually form alkenes.

After cracking, various olefins are mixed together, called pyrolysis gas, including the butadiene that Lin Yuan wants, which can be polymerized to form polybutadiene rubber, which first appeared in 1960, because of its superior performance and low cost, it is widely used in the production of tires, shoe soles and other items.

The pyrolysis gas needs to go through cryogenic separation to obtain the elemental gas used for further reaction, the so-called cryogenic refers to the temperature below 173 Kelvin, that is, minus 100 degrees Celsius, the acquisition of low temperature and high temperature is as difficult as the acquisition of high temperature, people in this era widely use ice stored in winter, which is a method to obtain low temperature.

However, the low temperature obtained by the ancients is too high compared with the low temperature required for industrial production, so if you want to obtain a low temperature of minus 100 degrees Celsius, you must use some special methods.

To make cryogenic cryogen, there must be high-quality refrigerant, which is difficult for the Beijing ship, because there are many equipment that needs low temperature on the Beijing ship, such as various radars, when the radar is working, the lower the temperature of the key components inside, the better, simply understand, the radar relies on electromagnetic waves when it works, and electromagnetic waves are generated by the periodic oscillation of current, that is, by the movement of electrons.

When the temperature rises, the electrons also move, which creates interference, which is usually called thermal noise, so the transmitter and receiver components of the radar need refrigerant to lower the temperature.

In order to maintain the low temperature of the low temperature part, the refrigerant needs to absorb heat in the low temperature part, and release heat in the high temperature part, then the refrigerant will become gaseous, which requires the compressor to change it back into a liquid state, and then flow back to the low temperature part to continue to absorb heat, which is the problem with this compressor.

What Lin Yuan didn't expect was that it was Liao Ming, an aero-engine expert, who raised the question, and he said: "The use of piston compressors cannot meet the requirements and cannot produce such low temperatures." Lin Yuan asked, "Old Liao, how did you know about the Dao?" ”

Liao Ming said with a smile: "In fact, the principle of the refrigerator and the engine is the same, the engine is to heat the gas and let the gas do the work, while the refrigerator is to do the work of the gas and let the gas refrigerate, their thermal cycle process is in the same form, but the direction is different." ”

Lin Yuan asked, "Then what kind of compressor should we build?" ”

Liao Ming said: "We should make centrifugal air compressors, such compressors, the compression capacity is stronger than the piston type, and there is a more important point." ”

Lin Yuan asked, "What is that?" ”

Liao Ming said: "Centrifugal air compressors can also be used in aircraft engines, you see our turbofan-30, the use of axial compressors, compressors are actually air compressors, different industries are called different methods, but the earliest jet aircraft, the use of centrifugal compressors. ”

Lin Yuan asked, "But how do we make it?" ”