Hybrid modified melamine salt, preparation method and application thereof

Abstract

The invention relates to a hybrid modified melamine salt, a preparation method and application thereof. The preparation method includes: 1) dissolving a melamine salt in a solvent, adding amino-rich graphite carbon nitride nanosheets, and carrying out reaction at 30-150DEG C for 0.5-4h; and 2) at the end of the reaction, conducting filtering, drying and crushing to obtain the hybrid modified melamine salt. Specifically, the amino-rich graphite carbon nitride nanosheets have a nitrogen content of 66-68wt%, the chemical structure is rich in amino, the thickness is 0.5-50nm, and the nanosheets contain a graphite-like structure. The 5wt% thermal weight loss temperature of the product is 20-80DEG C higher than that of non-hybrid modified melamine salts. The product obtained by the invention isalso applied to the field of flame retardant materials, and the flame retardant performance and carbon residue amount are greatly improved. The production raw materials used by the invention are widely available, the synthesis process is simple, the equipment requirements are low, and the product has good thermal stability, good compatibility with a polymer matrix and good flame retardant effect,and has great application prospects.

Description

technical field [0001] The invention belongs to the field of preparation and application of flame retardants, and relates to a hybrid modified melamine salt, a preparation method and application thereof. Background technique [0002] Polycyanamide polysalts, such as melamine polyphosphate, melamine cyanurate, etc., generally have the advantages of high thermal decomposition temperature, low water solubility, low smoke generation and less toxic gas generation. The synergistic and synergistic effect of the compound shows good flame retardant properties, and has become a research hotspot of flame retardants in recent years. It is an important phosphorus-nitrogen flame retardant and has been widely used in polyamide and polyolefin fields. . [0003] Although its application prospect is good, the application limitations of melamine salt are very strong, such as poor compatibility, uneven dispersion, large addition amount and large loss of mechanical properties. [0004] Modific...

AI Technical Summary

Problems solved by technology

For example, document 1: the Chinese patent application number 201310550306.X uses zinc borate to modify melamine cyanurate, which improves production efficiency and reduces the viscosity of the reaction system; document 2: patent CN 107556255 A utilizes organic amine to modify melamine Polyphosphate, obtained a good flame retardant effect and its mechanical properties are well preserved; Document 3 (SiO 2 Preparation of modified melamine cyanurate halogen-free flame retardant[J].Colloid and Polymer,2012,30(4):168-170.) SiO 2 The sol is used to modify melamine cyanurate to obtain in-situ modified melamine cyanurate, which can control its particle size; Document 4 (synthesis of metal ion modified melamine polyphosphate and its effect on glass fiber reinforcement) Flame retardant research of PA66 [D]. Northeast Forestry University, 2007.) Use different metal ions to modify melamine polyphosphate, and then apply it to the flame retardant of nylon 66. Although this method has a high yield, its The flame retardant effect is average, and the improvement is not good

Although the above-mentioned methods have advantages of one kind or another, they all fail to improve the thermal stability of melamine salt, that is, the thermal decomposition temperature has no obvious improvement.

Images