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Generation Principle of Modified Nylon

Release time:

2022-10-07 00:00

The formation process of modified nylon is a cationic catalytic polymerization reaction, and the reaction process is as follows:

1. Production of lactam cations:

in the metal sodium. Under the action of a partial alkali catalyst such as sodium hydroxide, caprolactam alone produces caprolactam sodium salt, and the active lactam cation is decomposed in the alkaline reaction system.

2. Chain growth process:

Further ring-opening of the lactam cation with a single nucleophilic addition reflex produces a viable amine cation dimer, which rapidly undergoes proton exchange with a single, resulting in acylation again.

A polymer is generated while the internal amine cation is generated again. (The cooling dimer has a cooling amine structure, has strong electrophilic properties, and becomes the **of the chain * *. Therefore, the vitality of the cation is the growth of the chain.

Factors that determine the rate of reaction.

3. Balance reflection and structure process:

The polymerization reaction of modified nylon is carried out below the polymer dissolution point. The late stage of polymerization is characterized by a rapid increase in content, and at the same time, with the polymer knot and condensation. People usually react directly.

The compound with imide structure is added as the active agent, so that the whole polymerization reaction can be completed rapidly at low temperature (120)~ 150 ℃).

At the same time, it can change the modifier by changing the type of catalyst with different structure or adding auxiliary catalyst with different structure, so as to produce different knot shapes during the polymerization process.

　

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Commonly used modified nylon performance application

Performance advantages of modified nylon

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What is the market demand and development of nylon?

The high-strength changes in the nylon market will become larger and larger, and new reinforcement materials such as inorganic whisker reinforcement will become larger and larger. Carbon fiber reinforced PA is mainly used for vehicle engine parts, mechanical parts and aviation equipment parts.

The difference between modified nylon material and pure nylon

There are two common materials on the market: modified nylon materials and pure nylon. What is the difference between these two materials? Compared with pure nylon, modified nylon material has greater impact toughness, stiffness, temperature resistance, creep and fatigue. The modified nylon material has mechanical elongation, molding shrinkage, water absorption and abrasion resistance.

Commonly used modified nylon performance application

Modified nylon is one of the five major engineering plastics, which has the characteristics of many varieties, large output and wide application. However, due to the wide variety of modified nylon, some products have similarities in the application field, and some products are very different and need to be carefully distinguished.

Generation Principle of Modified Nylon

The polymerization reaction of modified nylon is carried out below the polymer dissolution point. The late stage of polymerization is characterized by a rapid increase in content, and at the same time, with the polymer knot and condensation. People usually react directly.

Performance advantages of modified nylon

Nylon is a kind of engineering plastics with excellent mechanical properties, outstanding corrosion resistance, oil resistance, heat resistance, high modulus and so on. Reinforced, flame retardant modification, can significantly improve its heat resistance, modulus dimensional stability and flame retardancy, modified nylon is widely used as a substitute for metal, wood and other traditional materials, used in automotive, electrical and electronic, power tools and other industries.

Nylon Modified Material Market Application

Nylon raw material as the base material, by adding chemical or physical additives, through physical mixing or chemical reaction will change the physical and chemical properties of nylon itself, the formation of plastic granular products. The addition of a compatibilizer to the reinforced nylon G-5 cause the glass fiber to react with the nylon to produce a chemical bond that improves strength and toughness. Toughened nylon can be added with a toughening agent G-1. Abrasion resistant nylon, halogen free flame retardant nylon, conductive nylon, flame retardant nylon and so on. What are the uses of modified nylon?