Halogen-free flame-retardant reinforced polyamide composite material and preparation method and application thereof

Abstract

The invention discloses a halogen-free flame-retardant reinforced polyamide composite material and a preparation method and application thereof. The halogen-free flame-retardant reinforced polyamide composite material comprises the following components: polyamide resin, organic hypophosphite, melamine polyphosphate coated on the surface, an anticorrosive agent, a silicone master batch and fibers, wherein the anticorrosive agent comprises esterified polyol and at least one of zinc borate, zinc stannate, boehmite, hydrotalcite, zinc oxide, zinc hydroxide, basic zinc silicate or stannic oxide hydrate. The halogen-free flame-retardant reinforced polyamide composite material provided by the invention has the characteristics of high stability, good mechanical properties and excellent electrical properties, has very outstanding physical abrasion resistance and chemical corrosion resistance in the processing process, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a halogen-free flame-retardant reinforced polyamide composite material and its preparation method and application. Background technique [0002] Organic hypophosphite has been proven to have a good flame retardant effect in polyamide, and is widely used as a mainstream halogen-free flame retardant. However, the introduction of organic phosphinates will aggravate the corrosive wear on processing machines (extruders or injection molding machines). This wear phenomenon is intensified especially when fibrous hard fillers such as glass fibers are present at the same time, since highly corrosion-resistant steels do not have the hardness required for processing glass fiber-reinforced polymers. Also, the higher the processing temperature of the polymer, the higher the rate at which wear can occur. [0003] CN103214825A and CN103214833A respectively disclose the use of metal z...

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Problems solved by technology

However, as mentioned in CN103154110A, CN109575586A and CN105264001A, the introduction of MPP will increase the corrosion effect relative to the organic hypophosphite system alone

In order to solve such problems, CN107223149A adopts aluminum phosphite as a synergist to replace MPP, however, aluminum phosphite needs to be added in more parts, and the flame retardant efficiency is obviously not as good as MPP

CN102076752A uses zinc stannate, and simultaneously uses boehmite or alumina to replace the nitrogen-containing synergist represented by MPP, which significantly reduces the corrosion phenomenon in the processing process. However, as the injection molding time is further extended, its impact on the mold wear can still be clearly observed, and it also has the problem of relatively low synergistic effect of flame retardancy

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