6results 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 application provides a charging pile sheath composite material, made from at least the following raw materials in parts by weight: 60-80 parts of thermoplastic polyurethane elastomer, 5-15 parts of polyketimide, 10-20 parts of halogen-free flame retardant additives, and 1.5-3.0 parts of functional additives. This application also provides a method for preparing the charging pile sheath composite material, comprising the following steps: S1, melt-blending polyketimide with thermoplastic polyurethane elastomer or thermoplastic polyester elastomer, and granulating to obtain a pre-dispersed masterbatch; S2, melt-blending the pre-dispersed masterbatch, the remaining thermoplastic polyurethane elastomer, halogen-free flame retardant additives, and functional additives, and granulating to obtain the charging pile sheath composite material. The charging pile sheath composite material and preparation method provided in this application, by optimizing the raw material composition and ratio and the two-step processing technology, utilizes the dispersing and self-lubricating properties of polyketimide, combined with the flame-retardant synergistic effect of the halogen-free flame retardant additives, to improve the flame-retardant and wear-resistant properties of the charging pile sheath composite material.

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.

The application belongs to the field of textile fibers, and particularly relates to a phosphorus-nitrogen-silicon flame retardant for viscose fibers and application thereof. The preparation raw materials comprise a phosphorus-nitrogen-silicon flame retardant, a surfactant A, a surfactant B and water, the phosphorus-nitrogen-silicon flame retardant is obtained by modifying a double-end amino siloxane p-dithio pyrophosphate flame retardant, and the concentration is 20-50 wt%; the surfactant A is polyacrylamide, and the concentration is 0.1-1 wt%; the surfactant B is one or a combination of two or more of fatty alcohol polyoxyethylene ether, phenyl phenol polyoxyethylene ether, castor oil polyoxyethylene ether and fatty amine polyoxyethylene ether, and the concentration is 1-8 wt%. The three-element synergistic flame retardant reduces the addition amount in the viscose fibers, effectively improves the spinneret blockage, and reduces the influence on the mechanical properties of the fibers. In the flame-retardant dispersion liquid, the polyacrylamide macromolecular dispersant is selected, the crosslinked network structure can effectively prevent the loss of the flame retardant in the spinning process, and the washing resistance of the flame-retardant fiber is improved.

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.

The present application relates to the technical field of toughening and flame-retardant modification of polylactic acid, and in particular to a modifier with toughening and flame-retardant effects, a preparation method thereof and application in high molecular weight polylactic acid. An olefin-based monomer is polymerized by addition to form an elastomer polymer with high molecular weight, which is then reacted with a soft monomer of acrylic ester in a uniform emulsion A to form a three-dimensional crosslinked network structure, and the molecular chain formed is an amorphous high-elasticity molecular segment, which has good toughness. The hard monomer of acrylic ester in the uniform emulsion B grafted inhibits diffusion and arrangement of the molecular segment, thereby achieving a toughening effect. Meanwhile, the hard monomer of acrylic ester reacts with lignin in situ in a bulk polymerization reaction. Since lignin has good carbonization in the combustion process, it can prevent the material from continuing to burn, and thus has good flame retardancy, can be used as a flame retardant for high molecular materials, expands the application field of lignin and improves the utilization rate of lignin.