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[Chemical Knowledge]：Manufacturing method and process of nylon

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Nylon manufacturing method

Nylon is a widely used engineering plastic, because of its high strength, wear resistance, chemical corrosion resistance and other characteristics, is widely used in the field of chemical production raw materials. This article will introduce the manufacturing method of nylon, including polymerization reaction, processing molding and other steps.

1. Polymerization

nylon is made by polymerization. Polymerization is the process of linking many small molecules into one macromolecular polymer. The monomers for nylon are typically adipic acid and hexamethylene diamine.

1. Adipic acid and hexamethylene diamine are mixed together according to a certain molar ratio, an appropriate amount of water is added, and the pH value is adjusted to form a homogeneous salt solution.
2. under the condition of high temperature and high pressure, by adding catalyst, the polycondensation reaction of adipic acid and hexamethylene diamine occurs, and the polymer of nylon 66 is generated.
3. By controlling the reaction conditions and the use of additives, the molecular weight, molecular weight distribution and other properties of nylon can be adjusted.

2. processing molding
is made
nylon polymer, it needs to be processed and molded to become a product with practical value. There are many processing methods for nylon, including injection molding, extrusion, blow molding, calendering, etc.

1. Injection molding is a method in which nylon polymer particles are added to an injection molding machine, and molten nylon is injected into the mold by heating and melting, and the product is obtained after cooling and solidification.
2. Extrusion molding is a method in which nylon polymer particles are added to an extruder, heated and melted, and the molten nylon is extruded through a die. It is often used to manufacture pipes, rods, etc.
3. Blow molding is a method in which nylon polymer particles are added to a blow molding machine, and molten nylon is blown into a mold by heating and melting to form a hollow article.
4. Calendering is a method in which nylon polymer particles are added to a calender, and the molten nylon is calendered into a sheet of a certain thickness on the calender by heating and melting.

3. post-treatment

After processing and molding nylon products also need to be post-treated to improve their performance and service life. Post-treatment methods include heat treatment, mechanical treatment, chemical treatment, etc.

1. heat treatment can eliminate the stress inside the product and improve the crystallinity, improve the mechanical properties and dimensional stability of the product.
2. Mechanical treatment can improve the surface roughness of the product and improve the wear resistance of the surface.
3. Chemical treatment can change the chemical properties of the surface of the product, improve its chemical resistance and adhesion.

In summary, the manufacturing method of nylon includes the steps of polymerization reaction, processing molding and post-treatment. By controlling the reaction conditions and processing molding process, nylon products with different properties and service life can be manufactured to meet the needs of chemical production raw materials.

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