Halogen-free and flame-retardant nylon master batch with high CTI (Comparative Tracking Index) value and preparation method thereof

Abstract

The invention relates to halogen-free and flame-retardant nylon master batch with a high CTI (Comparative Tracking Index) value and a preparation method thereof. The performance of nylon is influenced by the conventional nylon flame retardant. The master batch is a mixture. Every 100 parts by weight of master batch contain 40-75 parts by weight of main a flame retardant, 1-20 parts by weight of a flame-retardant synergist, 20-40 parts by weight of carrier resin, 0.4-2 parts by weight of an antioxidant, 1-5 parts by weight of a CTI improver, 0.5-3 parts by weight of a coupling agent and 0.5-5 parts of a dispersing agent. The method comprises the following steps of: uniformly stirring and mixing the raw materials proportionally, lifting, and drying at the temperature of 60-100 DEG C in vacuum to obtain a crude material; and melting, extruding and granulating the crude material through a dual-screw extruder to obtain a finished master batch. The master batch provided by the invention can be directly added into a nylon substrate proportionally, so that the flame retardance of the nylon material is improved efficiently, harmful gas is not emitted during burning, and a CTI value of over 500V is obtained; and the preparation method has the advantages of easiness for operating, low energy consumption and easiness for industrial production.

Description

technical field [0001] The invention relates to a high CTI (Comparative Tracking Index, relative tracking index) value halogen-free flame-retardant nylon masterbatch and a preparation method, belonging to the field of polymer materials. technical background [0002] Due to its excellent mechanical properties and chemical corrosion resistance, nylon is widely used in automobiles, electrical equipment, mechanical parts, transportation equipment, textiles, and papermaking machinery. However, its flame retardancy is extremely poor. In order to meet the requirements of flame retardancy, it must be modified by flame retardancy. [0003] At present, flame retardants are generally directly added to impart flame retardant properties to nylon. Halogenated flame retardant is a kind of flame retardant with high flame retardant efficiency, but it will emit harmful gas when burning, and its application is limited. Although the newly developed intumescent and inorganic flame retardants a...

AI Technical Summary

Problems solved by technology

Halogenated flame retardant is a kind of flame retardant with high flame retardant efficiency, but when it burns, it will emit harmful gas to the human body, and its application is limited

Although the newly developed intumescent and inorganic flame retardants are environmentally friendly flame retardants, they must be added in a large amount to achieve a good flame retardant effect. This not only leads to a significant decrease in the CTI value of nylon materials, but also has circuit leakage, The danger of fire caused by short circuit, electric arc, electric spark, etc.; and it also significantly deteriorates the appearance, processing performance and physical and mechanical properties of its products, which limits its application in the fields of electronics and electrical appliances

On the other hand, flame retardants and additives are basically in powder form. During the processing of polymer materials, flame retardants and other additives are added one by one, which brings a lot of inconvenience to actual processing and various operations.

For example, it is not easy to accurately control the proportion of addition, hidden dangers of labor protection for operating workers, etc.

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