High-content glass fibre-enhanced nylon 66 composite material and preparation method thereof

Abstract

The invention relates to a high-content glass fibre-enhanced nylon 66 composite material and a preparation method thereof, and belongs to the field of high polymer materials. The composite material isprepared from the following components in percentage by mass: 31.9 to 38 percent of nylon 66, 58 to 62 percent of alkaline-free glass fibres, 2 to 5 percent of a compatilizer, 0.3 to 0.5 percent of amain antioxidant, 0.3 to 0.5 percent of an auxiliary antioxidant and 0.5 to 1.0 percent of a lubricating agent, wherein the surfaces of the alkaline-free glass fibres are coated with an enhancement layer; the enhancement layer is made of carbon nano-tubes or silicon carbide nano-tubes which are extruded and granulated by using a twin-screw extruder. The composite material provided by the invention is high in glass fibre content; the mechanical properties and the physical properties of the composite material are improved; moreover, the surfaces of the alkaline-free glass fibres are coated withthe nano-tubes; the compatibility of the alkaline-free glass fibres and the nylon 66 is increased by selecting suitable lengths and diameters of the glass fibres and the molecular weight of the nylon66; the defect that the appearance of the material becomes poor along with the increment of the content of the glass fibres filled in the nylon in the past is overcome.

Description

technical field [0001] The invention relates to a polymer material, in particular to a high-content glass fiber reinforced nylon 66 composite material and a preparation method thereof. Background technique [0002] Nylon 66, that is, polyhexamethylenediamine, the molecular formula is -[NH (CH 2 ) 6 NHOC (CH 2 ) 4 CO] n-, abbreviated as PA66, is one of the earliest developed, largest and most widely used varieties in the polyamide family. Nylon 66 is a colorless transparent semi-crystalline thermoplastic polymer. Its macromolecular main chain contains phthalamide functional groups, which can form hydrogen bonds. It is a polymorphic semi-crystalline polymer with excellent mechanical properties and wear resistance. , self-lubricating performance, corrosion resistance, and good formability, but high water absorption, low modulus, poor dimensional stability and electrical properties, heat resistance, light resistance, low temperature impact resistance, and dyeability are also...

AI Technical Summary

Problems solved by technology

If the interface bonding is not good, the glass fiber will not play a reinforcing role. Because the modulus difference between the glass fiber and the nylon matrix is ​​large, the two are not easy to wet, and the nylon matrix itself lacks reactive active functional groups, so it is difficult to Produces good chemical bonds with fibers, so the interfacial bonding of composite materials is weak

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