Halogen free flame retardant nylon 6 composite with high CTI value and preparation method thereof

Abstract

The invention discloses a halogen free flame retardant nylon 6 composite with high CTI value and a preparation method thereof. The composite comprises the following components by mass percent: 643.5-68.8wt.% of nylon, 10-12wt.% of fire retardant, 7-19wt.% of fire retardant synergetic inorganic packing, 8-12% wt.% of toughening agent, 1-3wt.% of bulking agent, 5-10% wt.% of enhance inorganic filler and 0.2-0.5wt.% of anti-oxygen which are prepared into the compound by a high speed premixing dispersing primary extrusion processing. The disclosed composite has as high as 550V CTI value and UL 94V-0 level excellent fire resistance; simultaneously, the polymer has good mechanical property by a comprehensive modified technique, wherein the tensile strength reaches 70.5Mpa, the bending strength reaches 90.7MPa and the impacting strength of a gap reaches 28.1kJ / m2. The invention solves the problem that the flaming resistant and high CTI value are difficult to satisfy simultaneously; the inventive 6 nylon compound is very suitable for preparing a low-pressure vacuum contactor, a transformer coil framework, a high-temperature resistant relay, a breaker, a high voltage electrical apparatus, a handle and a thin wall electronic and electrical appliance elements, and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a halogen-free flame-retardant nylon 6 compound with a high comparative tracking index (CTI) value, which is suitable for manufacturing low-voltage vacuum contactors, transformer coil skeletons, high-temperature-resistant relays, and circuit breakers. Devices, high-voltage electrical switches, handles, thin-walled electronic and electrical components, etc., belong to the technical field of modified nylon. Background technique [0002] Nylon is a common name for polyamide, which is a high molecular polymer containing amide groups (-NHCO-) ​​in the main chain of the molecule. Since it was launched in 1939 by Du Pont of the United States, it has developed into the engineering plastics with the most varieties and applications in the world, and its total output ranks first in the world of engineering plastics. The main varieties are: nylon 6, nylon 66, nylon 610, nylon 12, nylon 1010...

AI Technical Summary

Problems solved by technology

The flame retardant masterbatch is composed of melamine cyanurate, titanate coupling agent, resin, organic silica gel and potassium carbonate, which can effectively improve the flame retardant performance of nylon 6 and solve the problem of dripping when nylon 6 flame retardant materials burn. However, the CTI value of nylon 6 flame retardant materials has not been published