The invention relates to
flame retardants containing
melamine structure as well as a preparation method and application thereof. The chemical
structural formula of the
flame retardants is shown in thedescription, wherein
substituent groups R1, R2 and R3 are any one of
hydrogen,
tertiary butyl, normal-butyl, cyclohexyl
alkyl or
chlorine,
bromine, methyl, methoxy,
nitryl, amino, hydroxy-substitutedaryl or ceteroary. A synthesis method comprises the following steps: carrying out
Ugi reaction on
carboxylic acid compounds, the
melamine,
aldehyde compounds and isonitrile compounds in a mixed
solvent of
methanol and isopropanol at the temperature of 50 DEG C under the concerted
catalysis of an MCM-41-loaded
copper complex, MIL-101 and p-toluenesulfonic acid; carrying out filtering, extracting and
column chromatography on a product to obtain the
flame retardants containing the
melamine. The invention discloses a novel preparation method with the advantages of simple reaction, few byproductsand better selectivity, which is used for selectively synthesizing the melamine flame retardants. The flame retardants disclosed by the invention have the advantages of good
thermal stability, high flame retardancy rate, high purity reaching to 97.2 percent, easily-obtained raw materials, advanced technology and easiness for industrial production.