The PPA manufacturer will show you the difference of several common nylon

Most of my friends probably know a certain kind of nylon. However, there may not be many people who know nylon in a comprehensive way, especially some friends don't know why some nylon materials are very absorbent, but some nylon materials are not. Therefore, today's Xiaobian compiled a summary for everyone: the performance of common nylon is a big competition, and we can compare and understand nylon materials from a global perspective.

1、 Development History of Nylon

First of all, let's get to know the history of nylon:

On February 28, 1935, Carothers first synthesized nylon PA66 in the laboratory. On October 27, 1938, DuPont officially announced the birth of a synthetic fiber di in the world and named it nylon.

In 1938, PA6 was first successfully developed by P. Schlach of German I.G. Farbon Company. In 1943, PA6 was industrialized by the company, accounting for 70% of the nylon market.

PA610 was successfully developed by DuPont in 1941 and began to be produced and applied in the 1950s. PA610 plays an important role in nylon family.

In 1947, Atofina, France, began to use natural castor oil as raw material to produce PA111, which was industrialized in 1955.

In 1958, PA1010 was first successfully developed in China's Shanghai Celluloid Factory.

In 1962, DuPont developed meta aramid PA1313, which was industrialized in 1967.

In 1966, DuPont developed para aramid PA1414, which was industrialized in 1971.

PA612 was first developed by DuPont.

PA9T was first developed by Keli.

PA6T was first successfully developed by Mitsui Chemical.

In 1966, PA12 was first industrialized by AG of Germany.

PA46 was developed by the Dutch National Mining Company in 1985.

In 2006, Kingfa Technology began to research and develop PA10T.

At present, nylon is widely used in automobile parts, power, electronic devices, machinery industry, precision instruments, etc.

2、 Naming rules

After understanding the history, let's further understand nylon from the perspective of naming.

(1) Nylon polymerized by lactam ring opening is called nylon n, abbreviated as PAn. The general formula is as follows: ε- The polymer obtained by caprolactam ring opening polymerization is called PA6, ω- The polymer synthesized from aminoundecanoic acid is PA11.

(2) The polymer obtained by polycondensation of binary amine and binary acid is called nylon mn, abbreviated as PAmn. m is the number of carbon atoms of binary amine in the repeating unit, and n is the number of carbon atoms of binary acid in the repeating unit. The general formula is:

(3) It is expressed by the abbreviation of repeated diamine or diacid, for example, m-phenylenedimethylamine is abbreviated as MXDA, so the polymer of m-phenylenedimethylamine and adipic acid is called nylon MXD6.

(4) Copolymer nylon is a combination of nylon names named by the above method. The nylon names of the main components are put in front, for example, the copolymer nylon of nylon 6 and nylon 66 is called 6/66; If the main component is nylon 66, it is called 66/6.