9results about How to "High char formation rate" patented technology

The invention discloses an ablation-resistant EPDM (Ethylene-Propylene-Diene Monomer) thermal insulation material and a preparation method thereof, and belongs to the field of thermal insulation materials, the thermal insulation material is prepared from the following components in parts by mass: 70 to 80 parts of EPDM rubber, 20 to 30 parts of liquid EPDM, 15 to 20 parts of silicon dioxide, 10 to 40 parts of high-temperature-resistant filler, 10 to 15 parts of flame retardant, 10 to 15 parts of heat-resistant fiber and 3 to 5 parts of cross-linking agent. A third monomer of the ethylene propylene diene monomer is ethylidene norbornene, and the ethylene content is 50-60%. The raw materials are placed between double rollers to be mixed, and a mixed sheet is obtained; and performing vulcanization molding on the mixed sheet to obtain the ablation-resistant ethylene-propylene-diene monomer thermal insulation material. The content of the heat-resistant fibers is increased, the aramid fibers are subjected to in-situ carbonization to form a carbonized layer structure frame, and meanwhile, the content of SiO2 is regulated and controlled, so that the content of SiO2 is matched with the increase of the fibers, and the ablation resistance of the thermal insulation material is improved.

The invention belongs to the technical field of flame-retardant materials, and particularly relates to a P-N flame retardant as well as a preparation method and application thereof. The preparation method of the P-N flame retardant comprises the following steps: (1) taking amino trimethylene phosphonic acid and adding a solvent for dilution; (2) adding 1, 3, 5-tri (2-ethoxyl) 1, 3, 5-triazine-2, 4, 6-triketone into the solution obtained in the step (1), and carrying out a constant-temperature oil bath reaction for 2-5 hours to obtain a P-N flame retardant precursor solution; (3) preparing an aqueous solution of an amino compound; and (4) dropwise adding the P-N flame retardant precursor solution into an aqueous solution of an amino compound, carrying out constant-temperature oil bath reaction for 5-10 minutes to generate white precipitates, continuing to react for 0.5-1 hour after the precipitates are generated, washing, carrying out suction filtration on the precipitates, and drying to obtain the P-N flame retardant. The P-N flame retardant disclosed by the invention is a white solid which is almost insoluble in water at normal temperature, and has a good flame retardant effect on a bio-based material.

The present invention belongs to the technical field of polyester fiber manufacturing, and particularly relates to a flame-retardant polyester fiber and a preparation method thereof. The flame-retardant polyester material is obtained by melt blending and spinning polyester slices, flame retardants and modified aramid fibers as raw materials. The flame retardant interacts with cyclic phosphate as an acid source, melamine as a gas source and pentaerythritol as a carbon source. When heated, the decomposition product has a strong dehydration effect, which can carbonize the surface of the covered polymer to form a carbon film, isolate the air, and prevent the polymer from continuing to burn, so that the flame-retardant polyester fiber has good flame retardant properties.

The invention discloses a preparation method and application of a ternary flame-retardant and heat-conducting integrated auxiliary agent for a self-carrying heat-conducting channel. The preparation method comprises the following steps: activating flaky boron nitride and spherical aluminum oxide, loading the flaky boron nitride and the spherical aluminum oxide onto needle-shaped microcrystalline cellulose by a chemical grafting method to obtain a ternary heat-conducting agent, and preparing the ternary heat-conducting agent by taking polyphosphoric acid as an acid source, melamine as a gas source and pentaerythritol as a main carbon source. And carrying out flame-retardant modification on the activated ternary heat-conducting agent by combining grafting and coating methods to obtain the ternary flame-retardant-heat-conducting additive. The ternary flame-retardant and heat-conducting auxiliary agent realizes effective contact between heat-conducting media, and can provide an oriented three-dimensional heat-conducting channel for the polyurethane adhesive after being added into the polyurethane adhesive, so that the heat conductivity of the adhesive is remarkably improved; meanwhile, due to the introduction of the intumescent flame retardant, melt and molten drops of the polyurethane adhesive can be effectively inhibited, and the polyurethane adhesive is endowed with efficient flame retardance, so that integration of flame retardance and heat conduction is realized.

Provided are a continuous flat pressing surface layer flame-retardant particle board and a preparation method thereof, which can reduce the burning growth rate index of the flame-retardant particle board and the influence of the flame retardant on the surface bonding strength of the particle board. The method comprises: simultaneously atomizing and applying, to raw material particles, 10-15% of the mass of the particles of a melamine modified urea-formaldehyde resin adhesive and 0.5-0.8% of the mass of the particles of a sodium hydroxide aqueous solution with a concentration of 0.4-0.6 mol / L to obtain pretreated surface layer particles, and blending the surface layer particles with a surface layer flame retardant PAP-Mg-Zn at a mass ratio of 100:15-17 to obtain flame-retardant surface layer particles; and laying the flame-retardant surface layer particles and core layer particles in a manner that the surface layer particles are in the upper and lower layers and the core layer particles are in the middle layer, and then continuously flat pressing the board blank at a hot pressing speed of 220-250 mm / s to obtain the continuous flat pressing surface layer flame-retardant particle board. The structural formula of PAP-Mg-Zn is as follows.

The invention provides a flame-retardant polylactic acid composite material based on Schiff base, cyclodextrin and Co-MOF (cobalt-metal organic framework). An imidazole compound and cobalt salt are utilized to form Co-MOF outside cyclodextrin, the cyclodextrin is subjected to surface modification, siloxane phenyl Schiff base is added into the cyclodextrin, and the modified cyclodextrin inclusion compound flame retardant with a multi-component integrated multilevel structure is obtained. The flame retardant is compounded with polylactic acid, so that the flame retardant property of polylactic acid can be greatly improved, the char yield after combustion is high, the heat release amount and the release rate are both reduced, the yield of combustible gas is effectively reduced, and the effects of retarding flame, reducing heat, inhibiting smoke and inhibiting generation of toxic carbon monoxide are achieved.

The invention relates to the technical field of flame retardant plastics, and in particular to a flame retardant plastic material and a preparation method thereof. The invention adopts a reactive phosphorus-nitrogen flame retardant to improve the flame retardant performance of polypropylene plastics. The flame retardant of the invention uses phosphorus and nitrogen as main flame retardant elements, which work synergistically, have high flame retardant efficiency and good thermal stability. The prepared phosphorus-nitrogen flame retardant has double bond groups, which can undergo polymerization reaction with a small amount of double bonds remaining in polypropylene plastics under melting conditions, thereby being grafted onto polypropylene molecular chains, thereby improving the compatibility of the flame retardant in a matrix and obtaining a longer-lasting and effective flame retardant effect.

The present invention discloses a coke substitute product for a metallurgical vertical furnace and an application method thereof, and belongs to the field of metallurgical technology. The present invention produces a metallurgical coke substitute product with high strength, high durability and certain sealing properties by pressurizing and encapsulating a mixture of fossil and / or biological carbon-rich materials used for coking into carbon in a single miniature steel container serving as a carbonization chamber and a protective shell. When in use, the product is directly added to the vertical furnace along with other furnace charges, and during the downward process, the heat energy in the furnace is used to dry and distill the internal materials and form a carbonized body, and after the steel shell is dissolved, melted or broken, it participates in the furnace reaction and carburizes the molten iron, and finally supports the material column at the bottom of the vertical furnace. Under the condition that carbon-rich blocks are directly added to the charge to compensate for the carbon required for the carbon gasification reaction, the present invention can achieve all or most of the coke substitution, and at the same time, it can completely get rid of the dependence on coking coal required by the prior art.

The invention relates to the technical field of brake disc preparation, and in particular to a preparation process of a prepreg for a short fiber molded carbon / carbon brake disc; the nickel acrylate and methacrylate 4-boric acid phenol ester react with the thiol group on the surface of the carbon fiber to change the polarity or wettability of the surface of the carbon fiber; the impregnation liquid penetrates into the microstructure of the carbon fiber and interacts with the functional groups on the surface of the carbon fiber to form a stronger adhesion; this combination can increase the roughness of the carbon fiber surface and improve the friction coefficient between the carbon fiber and other materials, thereby improving the friction and wear performance of the brake disc, and the nickel / iron doped carbon fiber may have better mechanical properties and thermal stability, which can also improve the performance of the brake disc; the short fiber molded carbon / carbon brake disc prepreg prepared by the invention has significantly improved friction and wear performance, a small friction coefficient and good recovery performance, and can be used as a high-performance, pollution-free, green and environmentally friendly friction material.