3results about How to "Good char formation" patented technology

This invention discloses an intrinsic flame-retardant epoxy resin containing phthalonitrile and Schiff base structures, its preparation method, and its applications, belonging to the field of flame-retardant polymer materials technology. The intrinsic flame-retardant epoxy resin of this invention simultaneously contains phthalonitrile units, Schiff base units, and epoxy functional groups in its molecular structure. Its preparation method includes: obtaining an intermediate through a nucleophilic substitution reaction of nitrophthalonitrile with aminophenol, followed by Schiff base condensation with dihydroxybenzaldehyde, and finally reacting with epichlorohydrin to introduce epoxy groups. This resin combines the condensed-phase charring effect of phthalonitrile with the gas-phase flame-retardant effect of Schiff bases, producing a synergistic effect. When used as an intrinsic resin or additive in epoxy resin compositions, as an intrinsic resin, the cured product exhibits excellent flame-retardant properties. As an additive, it can improve the flame retardancy and mechanical properties of epoxy resin while maintaining thermal properties, exhibiting excellent flame-retardant efficiency.

This invention discloses an organosilicon-boron flame retardant, its preparation method, and its applications. This material exhibits excellent flame retardant properties and good light transmittance. The invention also provides a method for preparing this organosilicon-boron flame retardant, which is simple to operate, uses widely available raw materials, is low in cost, and can be applied to large-scale industrial production.

This invention provides a flame retardant for water-based fire-retardant coatings for steel structures, prepared from the following raw materials: urea, phosphoric acid, acidic lignin, and pentaerythritol; the weight ratio of urea, phosphoric acid, acidic lignin, and pentaerythritol is 1:(0.8-1):(0.1-0.5):(0.01-0.05). Applying this flame retardant to water-based fire-retardant coatings for steel structures achieves both moisture resistance and flame retardancy.