A kind of modified melamine cyanurate flame retardant and preparation method thereof

Abstract

The invention relates to a modified melamine cyanurate fire retardant and a preparation method thereof, and belongs to the field of preparation of a fire retardant polymer material. The preparation method comprises the following steps: modifying trithiocyanuric acid, adding and stirring melamine, cyanuric acid, trithiocyanuric acid and water in certain proportion into a reaction kettle to obtain a mixture I, keeping the reaction of the mixture I for 1 to 5 hours at the temperature of 80 to 150 DEG C to obtain viscose paste of modified melamine cyanurate, and filtering, drying and crushing the viscose paste of the modified melamine cyanurate to obtain modified melamine cyanurate, wherein the structure formula of the modified melamine cyanurate is as shown in the specification. Compared with the traditional melamine cyanurate, the modified melamine cyanurate has the characteristics of good thermal stability, high fire retardant efficiency, good dispersion property, high char yield, excellent comprehensive performance and the like.

Description

technical field [0001] The invention relates to a preparation method of a modified melamine cyanurate flame retardant, belonging to the field of flame retardant preparation. Background technique [0002] At present, the melamine salt flame retardant with the largest amount and the fastest growth is melamine cyanurate (MCA). body. It is a kind of fine chemical product developed in the 1980s and put into industrial production in large quantities. MCA has the advantages of high efficiency, halogen-free, non-toxic, low smoke, etc., and can be used as a flame retardant for various polymers, especially polyamide polymer materials. Compared with inorganic flame retardants, MCA has the advantages of high efficiency, good compatibility, and no frosting. MCA is very stable below 300°C, sublimes but does not decompose at 350°C, and MCA has high nitrogen content, dehydrates into charcoal at high temperature, releases nitrogen gas during combustion, can dilute the concentration of oxy...

AI Technical Summary

Problems solved by technology

However, the high melting point of MCA makes it mostly solid phase particles when blended with nylon, and the dispersion is uneven, which affects its flame retardant effect.

Since MCA is mainly gas-phase flame retardant, the amount of carbon formed on the surface of the polymer is low during the combustion process, and the carbon layer is loose, which cannot form a dense protective layer, which reduces the flame retardant efficiency of MCA.

The patent application number 201310550306.X uses zinc borate to modify MCA, so that zinc borate precipitates on the surface of the generated MCA particles, realizes the effective dispersion of reactants in the reaction medium, greatly reduces the ratio of water to reactants, and reduces the reaction system. Viscosity improves production efficiency and solves the problems of difficult stirring, large wastewater discharge, long water removal time, and low reaction solid content in the traditional synthesis process. However, this patent requires the addition of its metal cations during the synthesis of melamine cyanurate And adjust the pH value of the system, the process is complicated, and the flame retardant efficiency has no substantial improvement

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