Hydroxymethylated melamino-formaldehyde resin, preparation method and application thereof

The invention relates to the technical field of fine chemicals and flame-retardant materials, in particular to a preparation method and application of hydroxymethylated melamino-formaldehyde resin powder. The preparation method of the hydroxymethylated melamino-formaldehyde resin includes the steps of: (1) firstly adding melamine and a formaldehyde solution into a reaction container, then adding distilled water to keep the solid content of the system at 10-50%, then controlling the reaction temperature at 40DEG C-95DEG C, and carrying out stirring reaction for 0.5-6h; (2) at the end of the reaction, freezing the reaction container containing the reaction solution to convert the reaction solution into a solid reactant; and (3) finally, drying the obtained solid reactant to obtain the hydroxymethylated melamino-formaldehyde resin powder. The hydroxymethylated melamino-formaldehyde resin prepared by the preparation method of the hydroxymethylated melamino-formaldehyde resin provided by the invention has the char