After getting an accurate answer, Wang Zhengguo's heart was at the bottom, and when he arrived at the laboratory the next day, he was more calm, and when the professor arrived, the two immediately set off for Factory 123.

"Professor, I went back to find someone last night to confirm that the light-transmitting material on the plane is indeed made of resin material, the full name is polymethacrylic acid methyl vinegar transparent plastic, the English abbreviation PMMA, and the 123 factory has a branch factory for the production of this thing, this time we will go to this unit to see. ”

Hearing Wang Zhengguo say PMMA materials, Professor Liu can finally be sure that there is material this time, when he asked for project information before, he specifically checked the relevant information, and also knew that this kind of thing is used in the manufacturing process of resin translucent lenses, but he has not been in contact with it before, so it is not clear. Now the assistant also mentioned this thing, so there must be some material, but I didn't say it.

The professor has checked the relevant information before, and only then does he roughly know the performance of some PMMA materials, and he will roughly say it and share it when he really wants to, so as not to know when people ask about the 123 factory, it will be very embarrassing.

"Yes, that's what we want. PMMA resin material can be made into light-transmitting parts and belongs to the first generation of plexiglass. The manufacturing process is roughly to heat the PMMA material and stretch it from two or more directions to a certain extent, so that the molecular chains in the PMMA structure are arranged in an orderly state along the stretch direction, and the directional PMMA is made. ”

Regarding the situation of PMMA materials, Wang Zhengguo also got some news from Aunt Zhang last night, and understood that what the professor said was that there was no problem, which was roughly the process of processing PMMA materials into translucent parts, but it was condensed into one sentence.

The strength and toughness of light-transmitting parts made of PMMA material can be greatly increased, and even after 30 years, the aircraft manufacturing industry still uses directional PMMA to make transparent parts such as cockpit canopies.

In addition to PMMA, the first generation of plexiglass, a new material called polycarbonate vinegar (PC) was born in the aircraft cockpit canopy material technology, which is not as light transmittance as PMMA, but its toughness is extremely high and heat resistance is also good.

When the aircraft flies at Mach 2.0 or higher, the surface is subjected to aerodynamic friction, and the average temperature is as high as 110 degrees Celsius.

In addition, the PC material should also be better in terms of toughness, and when the aircraft is flying at low altitude, it is more susceptible to bird impact, and the PC material with better toughness can also be eaten in the era of the third generation aircraft.

Comparing the two materials of PMMA and PC, the future trend seems to be the world of PC composite materials, which is indeed true, in the era of third-generation aircraft, almost all aviation aircraft use PC composite materials to make cockpit covers, and there are few fighter cockpit canopies that insist on using a single PMMA material.

Now different from the special requirements of the cockpit canopy of the fighter jet, Wang Zhengguo needs to consider the resin optical lens, which is very different from the requirements of the cockpit canopy of the fighter jet compared to the performance requirements of the lens.

Fighter jets should be impact-resistant, high-temperature resistant, this is no problem, so the PC material comes from behind, but in a general sense, the optical lens has no requirements in this regard, relatively speaking, the optical lens is more required to be reflected in the light transmittance, and this just scratches the advantages of PMMA material, at least PMMA is the best polymer light transmittance material so far, and its visible light transmittance rate reaches 92% It is even higher than silicate glass, and it is also a good choice to use it as a organic optical glass material.

On the other hand, although the wear resistance of PMMA is not as good as that of silicate glass, it is definitely better than PC material, and the lenses of glasses need to be used for a long time in the environment with general daily maintenance conditions or even poor maintenance conditions, so there must be requirements in terms of wear resistance.

Although lenses made of resin-based organic materials are usually coated to improve the wear resistance of the lens surface, it certainly does not hurt if the wear resistance of the material itself is better.

Along the way, because the two of them both knew something about the PMMA material and exchanged information about the material with each other, Professor Liu realized that his assistant still had a set of his own ideas and opinions, and he would definitely make great achievements in the future.

From the Shu metropolitan area to the western suburbs of Huang Tianba 123 factory, the mode of transportation is relatively convenient, the two are only ten kilometers away, directly from the station to take the car to the line, along the way it will not take much time, if the inspection process is arranged appropriately, compact, or even go on the same day, you can go back on the same day.

And the entire Huang Tianba area, this is an industrial cluster with aviation manufacturing as the core, Wang Zhengguo was a military fan in his last life, and he was in Shudu, plus the teacher also had some free time for this profession, and he came a few times when he was fine, and even worked as a grass party, resisting all kinds of fancy "birds" with long guns and short cannons, and there were many good photos from his hands every year, and he was also an original military fan with dry goods on the Internet.

However, this time when he came to Huang Tianba again, although he understood that it was still the old place, but the surroundings were no longer the environment he was familiar with, and many things were very different from his memory, if it was said that thirty years later, Wang Zhengguo would still be able to know how to go, but now, in the early eighties, he was really blind to this place.

Speaking of the 123 factory in 1983, it really doesn't necessarily have the same scenery as 30 years later, at this time the 123 factory has just begun to transform to make J-7, but the transformation is as easy as it is said, and it seems that it is not very successful for the time being.

At this time, the J-7 series has not yet begun to exert force, its early models can not meet the requirements of the military, and the orders are only symbolically given, which can barely maintain production, as for export sales, because the J-7 M, which was a hit in Jordan and became popular, is still under development, and naturally there are no orders.

Moreover, the Jian-7 project has indeed received the attention of 286, and it is required to be grasped as the focus of the current aviation industry in the field of fighter aircraft, but with the implementation of the policy of 286 requiring the military to make concessions to the economy, at this time, the domestic military industrial units generally have poor production efficiency, including the 123 factory, everyone is living a "hard life".

But this is actually to be broken apart, the hard days are only relatively speaking, as far as the 123 factory is concerned, a very large state-owned military industrial unit, it still has two catties of iron, even if the efficiency is not good, it has always been a very good unit around Shudu, but it is only a little less prosperous than the glorious era of the past.

If Wang Zhengguo is not from 30 years later, if he does not know that the 123 factory will be able to rise 30 years later, just talking about the scene he sees now, it is actually no different from other old state-owned enterprises in China.

Along the way, Wang Zhengguo asked for directions several times, and all of them revealed their identities, but the other party still ignored them.

This kind of attitude can be said to be nice, it can be said that workers have the spirit of ownership, love the factory as home, always tighten the string of secrecy, and do not talk about their work unit with anyone they don't know; then it is difficult to say, it is natural that the workers are not approachable, indifferent, and numb, and everyone has made their identities clear, and you still don't want to take care of it, which is a typical example of everyone sweeping the snow in front of the door.