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[Chemical Knowledge]：What are the upstream raw materials of PA? What are the downstream products?

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In the field of chemical production raw materials, PA (polyamide, commonly known as nylon) is an important engineering plastic with excellent mechanical properties, heat resistance, wear resistance, chemical resistance and so on. PA has a wide range of upstream and downstream related products, and some of the main upstream and downstream products will be described in detail below.

upstream products:

1. Adipic acid: Adipic acid is the main raw material of PA66, which is prepared by the polycondensation reaction of hexamethylene diamine and adipic acid. The production methods of adipic acid mainly include phenol method, cyclohexane method and butadiene method.
2. Caprolactam: Caprolactam is the main raw material of PA6, prepared by ring opening polymerization reaction. The production methods of caprolactam mainly include phenol method, cyclohexanone oxime method and photo nitrosation method.

downstream products:

1. PA6 fiber: PA6 fiber is a synthetic fiber with good elasticity, abrasion resistance, wrinkle resistance and dyeing properties. It is widely used in textiles, clothing and industrial textiles.
2. PA66 fiber: PA66 fiber has high strength and rigidity, good heat resistance and chemical resistance, and is widely used in industrial filter cloth, safety belt, tire cord and other fields.
3. PA engineering plastics: PA engineering plastics have excellent mechanical properties, heat resistance, wear resistance, chemical resistance and other characteristics, and are widely used in automobiles, electronic appliances, aerospace, construction, machinery and other fields. Among them, PA6 and PA66 are the most widely used varieties.
4. PA film: PA film has good air permeability, oil resistance, tear resistance and puncture resistance, widely used in food packaging, pharmaceutical packaging, agricultural film and other fields.

In short, PA has a wide range of upstream and downstream related products, involving many fields, which has played an important role in promoting the development of the chemical industry.

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