Diacid monomer, copolymerized flame retardant, copolymerized flame-retardant nylon and preparation methods thereof

Abstract

The invention discloses a diacid monomer, a copolymerized flame retardant, copolymerized flame-retardant nylon and preparation methods thereof. The invention discloses the diacid monomer, the copolymerized flame retardant and the preparation methods thereof. The copolymerized flame-retardant nylon is mainly prepared from the following components: the copolymerized flame retardant, caprolactam, nylon 66 salt, a catalyst, an initiator and an end-capping reagent. The preparation method of the copolymerized flame-retardant nylon comprises the steps: putting the copolymerized flame retardant, caprolactam, nylon 66 salt, the catalyst, the initiator and the end-capping reagent into a reaction kettle, replacing air in the reaction kettle with a protective atmosphere, firstly heating and maintaining pressure for the first time, then heating and maintaining pressure for the second time, releasing pressure, draining water, vacuumizing and reducing pressure, and discharging to obtain the copolymerized flame-retardant nylon. The diacid monomer and the copolymerized flame retardant are excellent in thermal stability and high in flame-retardant element content, and mechanical properties and processability are not affected. The copolymerized flame-retardant nylon disclosed by the invention is excellent in comprehensive mechanical property, flame retardance and processability. The method is simple in process, low in cost, non-toxic, environment-friendly and suitable for industrial production.

Description

technical field [0001] The invention specifically relates to a diacid monomer, a copolymerized flame retardant, a copolymerized flame-retardant nylon and a preparation method thereof. Background technique [0002] Under normal circumstances, polyamide has excellent mechanical properties, electrical insulation properties, heat resistance, wear resistance, weather resistance, chemical solvent resistance, and it has certain self-lubrication, shock absorption, noise reduction and non-toxic environmental protection. Its application fields are very extensive. [0003] Flame-retardant polyamide is a modified engineering plastic mainly used in electronics, electrical, instrumentation and automobile industries, and it has a history of nearly 50 years. At present, most of the flame-retardant polyamides produced in industry are realized by adding flame retardants. Among the additive flame retardants that can be used for flame-retardant polyamides, brominated series are the most import...

AI Technical Summary

Problems solved by technology

Although the flame-retardant nylon 66 copolymer material obtained by this method has the advantages of less flame retardant addition, excellent mechanical properties, and good flame-retardant durability, the vertical burning test can reach UL94V-0 level, and the limiting oxygen index is above 32%, but The phosphorus-containing flame retardant introduced by it has a low initial decomposition temperature and is not suitable for polycondensation reactions that require higher polymerization temperatures, so that high-molecular-weight flame-retardant nylon 66 copolymers cannot be obtained

[0007] Nylon 66 has excellent physical and mechanical strength, wear resistance and solvent resistance, but nylon 66 is flammable, its limiting oxygen index is low, the calorific value is large when burning, the flame spreads fast and produces a lot of smoke and molten droplets , which limits its application in fields with high requirements for flame retardancy, such as military clothing, firefighting clothing, outdoor products, and decorations in public places.

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