502 glue can be used to glue shoes, plastic parts or even iron sheets. In our daily life, 502 glue is the most commonly used glue, which can be called "all-purpose glue". So, do you know the origin of 502 glue and why it is called 502? According to the CCTV documentary, in 1959, an American company invented a new glue, which quickly spread all over the world. This is quick drying glue;
At that time, a young scientist in China also noticed this invention. He was gezengbei. At that time, he worked in the Institute of chemistry of the Chinese Academy of Sciences and also undertook the task of inventing China's quick drying glue.
Finally in 1964, Ge zengbei developed China's own quick drying glue, which was named khkh502**
The name is also very interesting, in which "KH" is the abbreviation of the Institute of chemistry of the Chinese Academy of Sciences at that time, and "502" is the room number where the laboratory was located at that time**
As for other subsequent glues, such as 4011501101243, they are no longer named according to the room number, but according to the adhesive standard. The first digit represents the glue type, the middle digit represents the viscosity, and the last digit represents the specific composition.
It is reported that 502 is based on α－ It is a colorless and transparent liquid mainly composed of ethyl cyanoacrylate and added with tackifier, stabilizer, toughener and other materials. It is volatile and polymerized and solidified in the presence of trace water.
Because of its fast curing speed, easy to use, strong adhesive force and wide range of bonding materials, it is welcomed by officials in China. However, 502 has certain toxicity. Avoid direct contact with skin, mouth and nose or splashing into eyes.
In addition, the 502 we now use has been continuously improved by researchers, and its toughness, high temperature resistance and curing speed have been greatly improved.
