Organic montmorillonite modified flame-retardant PC material and preparation method thereof

Abstract

The invention relates to an organic montmorillonite modified flame-retardant PC material and a preparation method thereof. The composite material is characterized by being prepared by blending organic montmorillonite and PC resin and carrying out melt extrusion. The modification method comprises the following steps: 1, modifying Na-montmorillonite by using hydroxyhexyl triphenyl phosphorus chloride; and 2, blending the organic montmorillonite and the PC resin by using a high-speed mixer, carrying out melt extrusion by using a twin-screw extruder, granulating, and drying to obtain the PC resin material with good flame retardant property and mechanical property. The preparation method has the advantages that hydroxyl contained in the prepared organic montmorillonite can react with a matrix, so that the compatibility of the montmorillonite and the matrix is improved, and the nano-sized lamellar structure of the montmorillonite can improve the flame retardant property of the PC resin and also can improve the mechanical property of the polycarbonate; the phenomenon that the mechanical property of the polycarbonate is reduced due to the addition of the flame retardant is avoided. The flame retardant used in the invention is convenient to prepare and less in environmental pollution, and can avoid a series of problems caused by the addition of other flame retardants.

Description

technical field [0001] The invention relates to a flame-retardant PC material modified by organic montmorillonite and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Polycarbonate (PC) is widely used in electrical and electronic products due to its excellent mechanical, weather resistance, heat resistance and electrical insulation properties. PC itself has a certain flame retardancy, and the vertical combustion level can reach V-2 level, but it is required to meet V-1 level and above level when it is applied on the shell of information technology equipment such as a socket with USB interface. The fuel is modified. PC flame retardant modification is divided into halogen-containing flame retardant and halogen-free flame retardant according to whether the flame retardant contains halogen. Among them, halogen-containing flame retardants are usually brominated flame retardants, and halogen-free flame retardants are divided...

AI Technical Summary

Problems solved by technology

Proposed a polysiloxane flame retardant in CN101033330A, realized the synergistic flame retardancy of B and Si on the same molecular chain, solved the problem of uneven dispersion of boron compound and siloxane in PC, and at the same time the Flame retardant has good heat resistance, strong moisture absorption resistance and high flame retardant efficiency

However, the amount of phosphorus-based flame retardants added is large, generally 10% to 30%. Most of them have relatively low decomposition temperatures and are easy to corrode the mold. Some will also affect the impact strength of the resin. yellow

[0007] Aiming at the phenomenon that the above-mentioned modification method improves a certain performance while causing deterioration of other performances, this patent provides a montmorillonite-modified PC high-flame-retardant high-strength resin material and its preparation method. The first use of hydroxyhexyl three Phenyl phosphorus chloride modified montmorillonite and modified montmorillonite are blended with modified polycarbonate to prepare a highly flame-retardant PC resin material, which has the advantages of high flame-retardant properties and high mechanical properties.

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