9results about How to "High smoke suppression effect" patented technology

The invention relates to the technical field of composite materials, in particular to a synergistic flame-retardant epoxy resin-based porous sound insulation composite material and application thereof. The raw materials comprise 100 parts of bisphenol A epoxy resin, 15 parts of an aliphatic amine curing agent, 12 parts of ammonium dihydrogen phosphate, 6 parts of melamine, 4 parts of nano silicon dioxide, 5 parts of sodium chloride, 2 parts of ammonium bicarbonate, 0.8 part of carbon nanotubes and 0.5 part of a silane coupling agent. The synergistic flame-retardant epoxy resin-based porous sound-insulation composite material provided by the invention effectively solves the technical bottleneck that the flame-retardant, sound-insulation and mechanical properties of an epoxy resin-based material in the prior art are difficult to synergistically improve, and has remarkable beneficial effects in multiple aspects.

This invention relates to a flame retardant with both microwave absorption and smoke suppression functions. The flame retardant is a hierarchical porous metal-organic framework material with a three-dimensional polygonal structure, a size of 1-3 μm, and a pore size distribution between 1.0-50.0 nm. It carries nano-transition metal oxides internally and on its surface, with the nano-transition metal oxides accounting for 25%-65% of the total mass. The flame retardant provided by this invention possesses microwave absorption, flame retardancy, and smoke suppression properties. Its initial decomposition temperature is 442℃±10℃, with significant mass loss in the temperature range of 450-700℃. At 800℃, the residue content is as high as 50% or more, exhibiting excellent thermal stability and meeting the processing requirements for flame retardants in polyurea, epoxy resin, and polycarbonate.

This invention discloses a novel fire-resistant and flame-retardant polypropylene material, its preparation method, and its application in cables, belonging to the technical field of flame-retardant polymer materials. The material comprises 85-100 parts of propylene resin, 15-45 parts of a halogen-free intumescent flame retardant, 5-15 parts of a flame-retardant synergist, 3.5-7 parts of a compatibilizer, 0.5-2 parts of an antioxidant, 2-6 parts of a filler, and 2-3 parts of a lubricant. The flame-retardant synergist is prepared by reacting DOPO-PhOH, SPDPC, and trimethylamine, and has intramolecular chemical bonds of DOPO, a bispiral cyclic phosphorus structure, and aromatic groups. This invention utilizes the synergistic effect of the condensed-phase charring and gas-phase free radical capture of this flame-retardant synergist to achieve a UL94 V-0 rating for polypropylene at low addition levels, significantly suppressing dripping and reducing smoke density while maintaining good tensile strength and elongation at break. This solves the contradiction between flame-retardant efficiency and mechanical properties in traditional halogen-free flame-retardant systems, making it suitable for cable insulation layers.

The invention provides a single-component slow-curing flame-retardant smoke-suppression polyurethane for roads and a preparation method of a mixture containing the same. The mixture comprises the following raw materials: a stone combination, a single-component polyurethane adhesive, a curing agent and an inorganic flame retardant, and a pore-forming material is added into the single-component polyurethane adhesive. According to the method, the smoke density is reduced without the help of a large number of smoke suppression materials, the size of an internal pore structure is freely adjusted and controlled from a polyurethane body structure, efficient smoke absorption is achieved, and the method has a good effect on tunnel environment application.

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.

The invention belongs to the technical field of bio-based high polymer materials and adhesives, and relates to a preparation method and application of a phytic acid-based branched flame-retardant adhesive. Comprising the following steps: S1, carrying out heating reaction on glycerol and phytic acid under a solvent-free condition to form a phytate prepolymer; s2, adding maleic anhydride into the phytate prepolymer obtained in the step S1, and carrying out esterification reaction, so as to obtain functionalized branched polyphosphate; and S3, mixing the functionalized branched polyphosphate obtained in the step S2 with chitosan in water, heating and stirring to obtain the phytic acid group branched flame-retardant adhesive. After being cured under a hot-pressing condition, the adhesive prepared by the invention still keeps the shear strength of not less than 0.7 MPa after being soaked in hot water at 63 DEG C, the limit oxygen index reaches 80%, and the adhesive shows excellent flame retardant property and bonding stability. The raw material source is renewable, the process is green, no organic solvent is needed, and the adhesive is suitable for adhesion of various base materials such as wood, metal and glass, and is particularly suitable for preparing flame-retardant plywood.

The utility model relates to the technical field of sound insulation plates, in particular to a phenolic foam sound insulation plate. The structure sequentially comprises a surface sound absorption layer, a first enhancement layer, a main sound insulation layer, a second enhancement layer, a fireproof layer and a bottom reflection layer from top to bottom. The surface sound-absorbing layer is made of open-cell phenolic foam, and a hemispherical groove is formed in the surface of the surface sound-absorbing layer; the main sound insulation layer is made of closed-cell phenolic foam; the first reinforcing layer and the second reinforcing layer are made of glass fiber gridding cloth and are embedded into the upper surface and the lower surface of the main sound insulation layer respectively. The fireproof layer adopts a nano aluminum hydroxide coating and is coated on one side, far away from the main sound insulation layer, of the second enhancement layer; the bottom reflecting layer is an aluminum foil film and covers the side, away from the main sound insulation layer, of the fireproof layer. Through the design of a multi-layer composite structure, the sound insulation performance and the strength and fireproof performance of the sound insulation board are effectively improved, multiple noise reduction mechanisms of sound absorption, blocking and reflection are formed, and the sound insulation board can be widely applied to building and industrial scenes and has environment friendliness and economical efficiency.

The invention discloses a high-entropy layered double hydroxide coated flame-retardant smoke suppressant as well as a preparation method and application thereof, the flame-retardant smoke suppressant is a coated flame-retardant smoke suppressant taking a smoke suppressant as a shell layer and a phosphorus flame retardant as a core, and the smoke suppressant and the phosphorus flame retardant are combined in a chemical bond manner through the bonding effect of a silane coupling agent; the smoke suppressant is a high-entropy layered double hydroxide smoke suppressant; and the silane coupling agent is gamma-aminopropyl triethoxy silane. Silanization reaction sites are introduced to the surface of the phosphorus-based flame retardant, HELDH is induced to grow in situ on the surfaces of particles, a stable coating layer is formed, and integrated fixation and synergistic release of the smoke suppression component and the flame-retardant component on the single-particle scale are achieved. In the combustion stage, the HELDH and the pyrolysis product thereof cooperate with phosphorus-based components to promote char formation and capture smoke dust / inhibit volatile matter release, so that the flame retardance, the smoke suppression property and the processing stability are synchronously improved.

The invention discloses a preparation method of a PVC plastic composite pipe, and belongs to the technical field of plastic pipes. The preparation method is used for solving the technical problems that in the prior art, when polyvinyl chloride is prepared into a pipe, the processing fluidity is poor, and when a coupling agent modified inorganic flame retardant is doped into a PVC resin material, migration is prone to occurring, and the heat stability and the smoke suppression effect are poor. The preparation method of the PVC plastic composite pipe comprises the following steps: carrying out melt extrusion on modified polyvinyl chloride, a resin compound and a flame-retardant smoke suppressant to prepare the PVC plastic composite pipe, the resin compound is obtained by reacting polyvinyl alcohol, epoxy resin E-51, epoxy resin E-44 and polysulfide rubber; the flame-retardant smoke suppressant is obtained by coating a double-layer metal hydroxide with an iron-pyridine complex and then loading the double-layer metal hydroxide on activated carbon. The modified polyvinyl chloride reacts with the resin compound, so that the processability and the smoke suppression effect are improved; the flame-retardant smoke suppressant contains a multi-layer structure and multiple distributed active metal sites.