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Do you know nylon?

Views: 0     Author: Site Editor     Publish Time: 18-08-2022      Origin: Site


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Do you know nylon?

Polyamide commonly known as nylon (Nylon), English name Polyamide (referred to as PA), is a general term for thermoplastic resins containing repeating amide groups -[NHCO]- on the main chain of the molecule, including aliphatic PA, aliphatic-aromatic PA and aromatic PA . Among them, aliphatic PA has many varieties, large output and wide application, and its name is determined by the specific number of carbon atoms of the synthetic monomer. It was invented by the famous American chemist Carothers and his research group.


The nylon fibers used can be divided into two categories.

One kind is the poly-diacid diamine obtained by polycondensation of diamine and diacid, and the chemical structural formula of its long-chain molecule is:H-[HN(CH2)xNHCO(CH2)yCO]-OH

The other type is obtained by lactam polycondensation or ring-opening polymerization, and the chemical structural formula of its long-chain molecule is:H-[NH(CH2)xCO]-OH


Polyamide is mainly used for synthetic fibers, and its most prominent advantage is that its abrasion resistance is higher than that of all other fibers, which is 10 times higher than that of cotton and 20 times higher than that of wool. Greatly improve its wear resistance; when stretched to 3-6%, the elastic recovery rate can reach 100%; it can withstand tens of thousands of times of bending without breaking.

The strength of polyamide fiber is 1-2 times higher than that of cotton, 4-5 times higher than that of wool, and 3 times that of viscose fiber. However, polyamide fiber has poor heat resistance and light resistance, and poor retention, and the clothes made of it are not as stiff as polyester. In addition, both nylon-66 and nylon-6 used for clothing have the disadvantages of poor hygroscopicity and dyeing properties. For this reason, new varieties of polyamide fibers - new polyamide fibers of nylon-3 and nylon-4 have been developed. Lightweight, excellent wrinkle resistance, good breathability, and good durability, dyeability and heat-setting properties are therefore considered promising.

This type of product has a wide range of uses. It is a good material for plastics such as steel, iron, copper and other metals, and is an important engineering plastic; cast nylon is widely used to replace wear-resistant parts of mechanical equipment, and replace copper and alloys as wear-resistant parts of equipment. . It is suitable for making wear-resistant parts, transmission structural parts, household appliance parts, automobile manufacturing parts, screw-proof mechanical parts, chemical machinery parts, and chemical equipment. Such as turbines, gears, bearings, impellers, cranks, instrument panels, drive shafts, valves, blades, screw rods, high-pressure washers, screws, nuts, sealing rings, shuttles, sleeves, bushing connectors, etc.

Replacing metals such as copper

Because polyamide has non-toxic, light weight, excellent mechanical strength, wear resistance and good corrosion resistance, it is widely used to replace copper and other metals in the manufacture of bearings, gears, Pump vanes and other parts. Polyamide has high strength after melt spinning and is mainly used as synthetic fiber and can be used as medical suture.

For various medical and knitwear

For civilian use, it can be blended or spun into various medical and knitted products. Nylon filaments are mostly used in knitting and silk industries, such as woven single stockings, elastic stockings and other wear-resistant nylon socks, nylon gauze, mosquito nets, nylon lace, elastic nylon outerwear, various nylon silk or interwoven silk products. Nylon staple fibers are mostly used for blending with wool or other chemical fiber wool products to make various wear-resistant and wear-resistant clothing.

Nylon is widely used in industry to manufacture cords, industrial fabrics, cables, conveyor belts, tents, fishing nets, etc. It is mainly used for parachutes and other military fabrics in national defense.


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