Shulou(Shulou.com)11/24 Report--

Now there are a variety of glue on the market, and the function is becoming more and more powerful, and to say which kind of glue is most commonly used, I believe a lot of friends will say, it must be 502.

Although 502 glue sometimes accidentally brings a little pain to many people, it is very popular in the market because of its excellent bonding performance and low price.

But at the same time, some people have asked why 502 glue is called "502" instead of "520". Have you ever had this question? let's take a look at it.

Nowadays, the function of glue is so powerful that plastic, wood, metal, ceramics and so on can be bonded with glue, even our human bodies use glue, and the glue has reached the point that no object can not be glued, so that it is said that our world is glued together with glue.

In fact, this statement is not unreasonable, after all, the history of human use of glue has been tens of thousands of years, it can be said that the history of human development is relative to the history of glue, this is not an exaggeration.

It is said that the characteristic that distinguishes human beings from other animals is that they can use a variety of tools, and according to textual research, as early as when the earth was still in the ice age, in order to make sharp hunting tools, the ancients collected natural asphalt to fix and bond stones and sticks to make them more solid and durable.

The emergence of this kind of adhesive weapon ensured that people at that time had enough food, so glue has been used since human beings began to make tools.

Later, with the development of mankind and the formation of the country, many magnificent buildings began to be built, and they also need to use glue as an important building material.

For example, the Tower of Babylon used a large amount of natural asphalt as an adhesive in the construction process, and asphalt as a protective agent on the outer wall of the building; in the construction of the Great Wall of China, a large amount of glutinous rice mortar was used as an adhesive, although it has passed for thousands of years, but it is still strong.

In addition to getting natural adhesives from nature, ancient people would also get glue from plants and animals, such as collecting some sap from tree trunks, and boil animal bones or some internal organs for a long time. Can also be made into glue.

In modern times, especially after the technological revolution, there is an increasing demand for adhesives, and at the same time, the requirements are getting higher and higher. the traditional natural rubber obtained by previous methods can no longer meet the demand, so new adhesives are needed.

At the beginning of the 19th century, artificial chemical synthetic adhesive came out, chemists gradually invented a variety of new adhesive materials on the basis of phenolic resin, these new adhesives quickly changed the traditional production process of some industries.

For example, some metal materials need to be riveted or welded before, and then they can be completed directly with powerful glue, which can not only improve production efficiency but also improve product miniaturization and lightweight.

Nowadays, no matter which industry the whole society is, it is almost inseparable from glue, whether it is airplanes in the sky, high-speed trains on the ground, and even we use special medical adhesives in human surgery and tissue repair.

If we say that our world is made of glue, you will think it makes a lot of sense, and for us ordinary people, the most commonly used is 502.

502 is mainly composed of ethyl α-cyanoacrylate, adding tackifier, stabilizer, toughening agent, and other materials. it is a colorless and transparent liquid and has the advantages of easy volatilization, polymerization and curing in case of trace moisture, fast curing speed and easy to use. strong adhesion and a wide range of adhesive materials.

I once thought that 502 should be made abroad, but in fact, it was invented by the Chinese themselves, and it has been more than 50 years ago.

In 1959, an American company invented a new glue, which quickly spread all over the world, which was quick-drying glue. At that time, someone in China also noticed this invention, GE Zengbei, who also took on the task of inventing Chinese quick-drying glue.

Finally in 1964, GE Zengbei developed China's own quick-drying adhesive at the then Institute of Chemistry of the Chinese Academy of Sciences in Beijing.

There are many different answers to the name of this quick-drying adhesive, and there are several versions.

one。 Some people say that this glue is successful through 502 experiments, so it is called 502.

two。 It is also said that it is named after the type of group in the adhesive composition.

three。 Others said that the room number of the glue was room 502, so it was named 502.

Does it seem that the second statement is more reliable, but the editor inquired about the information for two days and did not find the official standard answer?

Finally, such a statement was found in the CCTV documentary "Decoding the History of Science and Technology-the bonded World". The quick-drying glue developed by GE Zengbei was named KH502, in which "KH" was the abbreviation of the Institute of Chemistry of the Chinese Academy of Sciences, and "502" was the room number where the laboratory was located at that time.

Isn't it a surprise? it's really named after the room number. The documentary of CCTV should be convincing.

So someone must say that the glue is also like 401501101243 and other types of glue, are they also named after the room number?

The latter names are actually based on adhesive standards, in which the first digit represents the type of glue, the middle number represents the degree of stickiness, and the last digit represents the specific composition.

The research and development and naming of 502 appeared earlier than the standard, so the glue 502 developed by GE Zengbei was named according to the room number, and the later glue had a standard, and the rule of naming the model with numbers like 502 was also used. but the following number is not the room number.

502 was quickly welcomed in the market because of its excellent performance, which could be bonded to almost all the materials at that time.

The 502 we use now is also improved continuously by researchers, and its toughness, high temperature resistance and curing speed have been greatly improved.

With the development of society and science and technology, the demand for glue is constantly changing, and there are many new types of glue to meet the needs of the society.

Similarly, 502 has been constantly improving the formula to improve the bonding quality since its birth, which is one of the reasons why 502 is still loved by consumers.

The picture in this paper is taken from Youtube "So. Calif. Hafted Scraper & Cool Bones "" Official All Things Bakelite The Age of Plastic Trailer "" A Brief History Of Adhesives "" CCTV-10 Science and Technology Decoding History "

This article is from the official account of Wechat: manufacturing principle (ID:zhizaoyuanli), author: Lao Zheng

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