Preparation method of fire retardant coating

Abstract

The invention relates to a preparation method of a fire retardant coating. The preparation method comprises the following steps of: firstly, mixing polyalcohol, ammonium polyphosphate and montmorillonite for stirring; adding diisocyanate, dimethylolpropionic acid and a catalyst into the obtained mixture; after reaction, obtaining a prepolymer; adding 1, 4-butanediol into the prepolymer, carrying out reaction and obtaining a neutral body; cooling the neutral body and then adding triethylamine into the cooled neutral body for reaction; adding nano-microcrystalline cellulose water solution treated by dispersion into the reaction product, stirring and obtaining emulsion; and transferring the emulsion into a template, molding and obtaining the fire retardant coating. According to the method, polyurethane is taken as a film forming matter, the nano-microcrystalline cellulose is taken as a carbonizing agent, the ammonium polyphosphate is taken as an acid source and a gas source, and the montmorillonite has the reinforcement function. The fire retardant coating prepared by the invention is free from pollution, is safe and reliable, is good in mechanical performance, and does not emit corrosive gases such as hydrogen halide and the like when being decomposed by heating.

Description

technical field

[0001] The invention relates to a preparation method of a flame-retardant coating, in particular to a preparation method of an intumescent waterborne polyurethane flame-retardant coating. Background technique

[0002] At present, the amount of wood materials and paints used in interior decoration is increasing year by year. Due to the flammability and flammability of wood materials and some paints, there must be fire hazards. In recent years, due to the extensive use of decorative materials, such fires are on the rise. The preparation of new non-combustible, flame-retardant and low-toxic decorative materials has been highly valued by relevant state departments.

[0003] Water-based polyurethane materials use water as a solvent, which has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. It has excellent performance and has a promising future in coating applications, but polyure...