Polyamides are primarily used to manufacture synthetic fibers. Their most notable advantage is exceptional abrasion resistance—surpassing all other fibers—with a wear resistance ten times that of cotton and twenty times that of wool; incorporating even a small amount of polyamide fiber into blended fabrics significantly enhances their durability. Thanks to properties such as non-toxicity, light weight, high mechanical strength, and resistance to abrasion and corrosion, polyamides are widely used as substitutes for metals like copper in the manufacture of bearings, gears, pump impellers, and other components across industries including machinery, chemicals, instrumentation, and automotive manufacturing.

**Characteristics**
Compared to ordinary plastics, polyamides offer advantages such as abrasion resistance, light weight, high strength and toughness, chemical and heat resistance, self-lubricating properties, ease of molding and dyeing, and non-toxicity. Their primary drawback is high water absorption, which directly affects the dimensional stability of finished products. **Raw Materials**
The raw materials for polyamide production are primarily derived from petroleum refining products. Depending on the monomers used, production methods fall into three categories: synthesis using a single monomer (such as lactam or amino acid) via a series of reactions—including hydrolysis, ring-opening, addition, and polycondensation—under specific catalyst and temperature conditions (e.g., Nylon 6); synthesis using two monomers—a dicarboxylic acid and a diamine—typically via vacuum dehydration polycondensation (e.g., Nylon 66); and synthesis using an aromatic diamine and an aromatic diacid chloride via solution polymerization at low temperatures (e.g., poly-m-phenylene isophthalamide). Due to the low melt viscosity and excellent fluidity of polyamides, they are primarily processed via injection molding and extrusion; depending on specific requirements, methods such as sintering and casting may also be employed.

**Characteristics**
As a major engineering plastic, nylon is widely used in sectors such as machinery, automotive manufacturing, electrical appliances, textile equipment, chemicals, aerospace, and metallurgy. It has become an indispensable structural material across various industries, possessing the following key characteristics:
1.  **Excellent mechanical properties:** Nylon exhibits high mechanical strength and good toughness. 2.  **Good self-lubricating properties and wear resistance:** Nylon exhibits excellent self-lubricating characteristics and a low coefficient of friction, resulting in a long service life when used in power transmission components.
3.  **Excellent heat resistance:** High-crystallinity nylons (such as Nylon 46) possess high heat deflection temperatures and can withstand long-term use at 150°C. When reinforced with glass fiber, the heat deflection temperature of PA66 can exceed 250°C.
4. Excellent electrical insulation properties. Nylon features high volume resistivity and high dielectric strength, making it an excellent insulating material for electrical and electronic applications.
5. Excellent weather resistance.
6. Water absorption. Nylon has a relatively high water absorption rate—with saturation levels exceeding 3%—which can affect the dimensional stability of molded parts to some extent.

Applications

Used as a curing agent and toughening agent for epoxy resins, as well as a cable sealing material; primarily utilized in the production of adhesives, coatings, and gaskets. It also serves as a room-temperature curing agent for epoxy resins. Application areas include biochemical research.

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