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Basic knowledge of nylon

Views: 2     Author: Site Editor     Publish Time: 2021-10-29      Origin: Site


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Nylon is also a polyamide fiber. It has a more well-known name, called Nylon, the English name Polyamide (abbreviated as PA)


The invention of nylon

Nylon was invented on February 28, 1935, by Wallace Carothers of DuPont, Wilmington, USA.

Nylon officially went on the market in 1938. The earliest Nylon product was a toothbrush and brush made by Nylon, which went on sale on February 24, 1938; the nylon stockings worn by women went on the market on May 15, 1940. Nylon fiber is a raw material for a variety of man-made fibers, and hard Nylon is also used in the construction industry.


Characteristics of nylon

The biggest advantage of nylon is strong wear resistance, low density, light fabric, good elasticity, fatigue resistance, good chemical stability, alkali and acid resistance!

The biggest disadvantage is that the sun resistance is not good, the fabric will turn yellow after long exposure, the strength will decrease, and the moisture absorption is not good, but it is better than acrylic and polyester.


Nylon products


1. Nylon 46 (PA46)

English name: Polyamide46 or Nylon46; referred to as PA46. Nylon 46, also known as polyamide 46, is polybutylene adipamide.

Its outstanding features are high crystallinity, high temperature resistance, high rigidity and high strength. Mainly used in automobile engines and peripheral components, such as cylinder heads, cylinder bases, oil seal covers, and transmissions. In the electrical industry, it is used as a contactor, socket, coil bobbin, switch and other fields that require high heat resistance and fatigue strength.


2. Nylon 4T (PA4T)

English name: Polyamide4T or Nylon4T; referred to as PA4T. Nylon 4T, PA4T is the first high-temperature nylon synthesized since the beginning of the 21st century. It was born on September 27, 2007, and it has been 10 years. Among the polymer group, it is the first high-temperature nylon invented after 2000.

The melting point of PA4T pure resin is very high, exceeding its decomposition temperature. If it is not modified by copolymerization to lower its melting point, it cannot be commercialized and it is extremely difficult to promote it. Therefore, the promotion of PA4T in the market generally requires copolymerization and modification. The common method is to copolymerize with PA66 and/or PA6 to lower the melting point. After modification, it has excellent comprehensive mechanical properties, good fluidity, excellent electrical properties, outstanding chemical resistance and high temperature resistance, which can meet the requirements of electronic and electrical, mobile terminals and other fields.


3. Nylon 56 (PA56)

English name: Polyamide56 or Nylon56; Abbreviation: PA56. Nylon 56 is formed by polycondensation of pentane diamine and adipic acid. The extraction of pentane diamine can come from natural organisms.

Environmental protection, good performance, can improve the comfort of the terminal fabric. Its water absorption, glass transition temperature, strength, softness, moisture absorption, and resilience are better than some products of nylon 6, nylon 66, and polyester.


4. Nylon 6 (PA6)

English name: Polyamide6 or Nylon6, referred to as PA6; Nylon 6, also known as polyamide 6, namely polycaprolactam, obtained by ring-opening polycondensation of caprolactam, molecular structure:

It is a translucent or opaque milky white resin with excellent mechanical properties, stiffness, toughness, abrasion resistance and mechanical shock absorption, good insulation and chemical resistance. It is widely used in many fields such as auto parts, electronic and electrical components.


5. Nylon 66 (PA66)

English name: Polyamide66 or Nylon6; referred to as PA66; nylon 66, also known as polyamide 66, namely polyhexamethylene adipamide. Compared with nylon 6, its mechanical strength, stiffness, heat resistance, wear resistance, and creep resistance are better, but the impact strength and mechanical shock absorption performance are reduced. It has a wide range of applications in automobiles, unmanned aerial vehicles, electronic and electrical, etc.

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