50 results about "Melamine phosphate" patented technology

The invention belongs to the field of flame-retardant materials, and particularly relates to a flame-retardant wood-plastic composite material and a preparation method thereof. Raw camphorwood powder is subjected to alkali treatment and hyperbranched silicon dioxide grafting treatment and then is subjected to melt blending with polypropylene, piperazine pyrophosphate and melamine phosphate, and the wood-plastic composite material with the intumescent flame-retardant effect is prepared. Limit oxygen index, vertical combustion, thermogravimetry, cone calorimetry and other tests show that the prepared wood-plastic composite material has excellent flame retardance, the limit oxygen index can reach 36.8%, the vertical combustion test reaches the V-0 grade, the total smoke release amount is reduced to 45.3% of that of raw materials, the flame retardance, smoke suppression and other performance are remarkably improved, and the wood-plastic composite material has good application potential.

The invention discloses a preparation method and application of fine-grained melamine phosphate.The preparation method comprises the steps that after melamine, water and a composite surfactant are ultrasonically mixed to be uniform, the ultrasonic power is improved, phosphoric acid is dropwise added, then the ultrasonic power is reduced, a temperature rise reaction is conducted to obtain reaction liquid, and then the fine-grained melamine phosphate is obtained after cooling, filtering, washing and drying are conducted; wherein the composite surfactant is composed of a gemini surfactant and a polymer surfactant according to a mass ratio of (1-20): (5-40). According to the preparation method disclosed by the invention, the composite surfactant and the multi-stage ultrasonic treatment are utilized to cooperate with the mixed materials and react, so that the fine-grained melamine phosphate with the particle size of 1-4.5 microns is prepared, and the preparation method has the advantages of high reaction efficiency, simplicity in operation and the like.

The invention belongs to the technical field of carbon materials, and provides tin-copper co-doped porous carbon and a preparation method and application thereof.The preparation method comprises the steps that A, raw materials are mixed, a hydrochloric acid solution is added to adjust the pH of a system to 5-6, stirring and cooling are conducted to the room temperature, then standing is conducted to form wet gel, freeze drying is conducted, and gel is obtained; wherein the raw materials comprise 0.8 g to 1.2 g of copper acetylacetonate, 4 g to 6 g of 2-aminobenzaldehyde, 4 g to 6 g of melamine phosphate, 4 g to 6 g of resorcinol and 8 ml to 12 ml of a formaldehyde solution with the concentration being 30 wt%; b, carbonizing the gel in inert protective gas to obtain copper-doped porous carbon; c, tin powder and the copper-doped porous carbon obtained in the step B are subjected to ball milling and mixing according to the mass ratio of 2: (7-12), then the mixture is placed in inert protective gas to be carbonized, and the tin-copper co-doped porous carbon is obtained. The prepared porous carbon material is high in CO2 electrocatalytic activity and has a wide application prospect.

The invention relates to the field of plastic master batches, and provides an enhanced flame-retardant master batch material and a preparation method thereof, and the master batch comprises a core-shell structure flame retardant, polypropylene, a compatibility modifier, a lubrication dispersing aid, a surfactant, an anti-aging stabilizer and ethanol. The core-shell structure flame retardant is formed by coating melamine phosphate with bimetallic layered hydroxide microspheres with hollow structures and nanoscale wrinkled surfaces. The flame retardant is prepared through an ultrasonic impregnation method, microspheres are synthesized through a hydrothermal reaction, and structural control is achieved by regulating and controlling the Mg / Al molar ratio, the pH value, the filling degree and reaction conditions. The master batch is prepared through the steps of premixing compounding, melt extrusion, cooling granulation and post-treatment, has excellent flame retardant property, thermal stability and dispersion compatibility, and is suitable for flame retardant enhancement application of polyolefin-based materials.

The invention belongs to the technical field of solid waste recycling and wastewater treatment, and particularly relates to a method for treating chromium-containing wastewater by adopting organic amine flue gas desulfurization residues. According to the method, organic amine flue gas desulfurization residues are used as a reducing agent, phosphoric acid is used for controlling the pH value of wastewater, hexavalent chromium is reduced into trivalent chromium under the acidic condition, meanwhile, desulfurization ash is converted into a melamine phosphate flame-retardant material, and trivalent chromium is separated from water in a precipitation form under the neutral condition; after the precipitate is roasted, chromium sesquioxide powder with relatively high purity is obtained, residual ammonia nitrogen in the wastewater, the added magnesium salt and residual phosphoric acid in the water form struvite precipitate, so that the ammonia nitrogen in the water is removed, and the struvite can be used as a raw material of a slow-release fertilizer. According to the method, the treatment cost of the vanadium extraction wastewater and the flue gas desulfurization slag is remarkably reduced, valuable elements are fully recycled, and resource utilization of flue gas desulfurization waste in a waste-to-waste mode is achieved.

The invention belongs to the technical field of carbon materials, and provides a nitrogen-phosphorus-doped porous carbon modifier and a preparation method and application thereof.The preparation method comprises the steps that raw materials and water are mixed, stirred and dried, and a mixture is obtained; wherein the raw materials comprise polyaspartic acid, magnesium sulfate, polyvinylpyrrolidone and melamine phosphate in a mass ratio of (3-7): (4-6): (4-6): (3-7); the mixture is kept at 280-320 DEG C for 8-16 h, and a polymer is obtained; carbonizing the polymer in an inert gas atmosphere for 1.5-3 hours to obtain a nitrogen and phosphorus doped porous carbon modifier; wherein the carbonization temperature is 850-1000 DEG C. According to the preparation method, the nitrogen and phosphorus doped porous carbon is obtained, the porous carbon can be applied to a rubber additive and a battery negative electrode material, rubber can be effectively reinforced and the wear resistance of the rubber can be improved after the porous carbon is applied to the rubber additive, meanwhile, the preparation method is simple, complex steps are avoided, and the cost is reduced.

The invention discloses a preparation method of melamine polyphosphate, which belongs to flame retardant production, and comprises the following steps: S1, forming an ammonium dihydrogen phosphate melamine diamide mixed solution; s2, forming a melamine polyphosphate intermediate; s3, performing thermal condensation reaction in a melamine phosphate intermediate thermal condensation reaction device to obtain melamine polyphosphate; comprising a kettle body and a stirring system used for stirring, the kettle body is composed of a kettle bottom, a kettle body and a kettle cover, a reaction cavity is defined by the kettle bottom, the kettle body and the kettle cover, a heat conduction oil jacket is arranged outside the kettle body and the kettle bottom, the heat conduction oil jacket is provided with a heat conduction oil inlet and a heat conduction oil outlet, a feeding port is formed in the kettle cover, and a discharging pipe is arranged on the kettle body. And a plurality of heat transfer solid spheres which are uniformly distributed during working are arranged in the reaction cavity. According to the invention, the phenomena of wall sticking and shaft sticking are avoided, the caking phenomenon is basically avoided, and condensed discharged materials can be directly screened.

The invention provides a polyethylene composition as well as a preparation method and application thereof, and the polyethylene composition comprises the following components in parts by weight: 54-71 parts of low-density polyethylene, 9-16 parts of linear low-density polyethylene, 15-35 parts of a composite flame retardant, 0.1-1 part of an antioxidant and 0.1-1 part of an anti-dripping aid, wherein the composite flame retardant comprises a phosphoric acid flame retardant, an inorganic zinc salt flame retardant, melamine polyphosphate and melamine cyanurate; the polyethylene composition provided by the invention has high flame retardancy, high toughness and high flow processability under the conditions of no halogen-containing flame retardancy, safety and environmental protection.

This invention discloses an environmentally friendly, high flame-retardant cable material and its preparation method, relating to the field of cable material technology. It comprises the following raw materials in parts by weight: 100 parts thermoplastic polyester elastomer, 10-15 parts benzene ring-containing hyperbranched polyborosilicate, 8-10 parts 3-tris(hydroxymethyl)methylamine-2-hydroxypropanesulfonic acid, 1-3 parts phosphorus pentoxide, 0.5-0.8 parts polyphosphoric acid, 3-5 parts melamine phosphate, 25-35 parts modified filler, 3-5 parts compatibilizer, 0.8-1.5 parts antioxidant, 0.5-0.8 parts lubricant, 4-6 parts plasticizer, and 1-2 parts light stabilizer. This cable material exhibits significant flame retardant effect, excellent mechanical and environmental properties, good aging resistance, and a long service life.

The invention relates to a high-voltage-resistant anti-breakdown automobile wire sheath and a preparation method thereof, and relates to the technical field of automobile wire harnesses, and the high-voltage-resistant anti-breakdown automobile wire sheath comprises a modified styrene-ethylene-butylene-styrene block copolymer, polypropylene, functionalized magnesium hydroxide, melamine polyphosphate, white oil and a functional auxiliary agent. An N-vinylcarbazole group grafted on a styrene-ethylene-butylene-styrene block copolymer molecular chain is used as an electron donor, an anthraquinone derivative chemically bonded on the surface of a magnesium hydroxide particle is used as an electron acceptor, and the N-vinylcarbazole group and the anthraquinone derivative form a large number of charge transfer complexes at an interface through pi-pi interaction. According to the charge transfer complexes, a high-density deep energy level trap is introduced into an energy band structure of the material, so that the charge behavior of the material in a high electric field is changed, and high-performance high-voltage-resistant and anti-breakdown effects are realized.

The invention discloses a weather-resistant flame-retardant single-component perfluoropolyether waterproof coating and a gradient catalytic preparation method thereof, and the coating is mainly prepared from the following components in parts by weight: 20-30 parts of perfluoropolyether diol with the molecular weight of 4000, 5-10 parts of perfluoropolyether diol with the molecular weight of 2000, 5-7 parts of isophorone diisocyanate and 25-35 parts of piperazine pyrophosphate. The coating comprises the following components in parts by weight: 20-30 parts of epoxy resin, 3-6 parts of melamine phosphate, 0.3-1.0 part of secondary amino silane, 0.1-0.2 part of an organic bismuth catalyst and 0.03-0.08 part of dimorpholine diethyl ether. The weather-resistant flame-retardant single-component perfluoropolyether waterproof coating disclosed by the invention has the advantages of excellent storage stability, outstanding mechanical properties, excellent weather resistance, up-to-standard flame retardance, high curing efficiency and good self-cleaning performance, and is particularly suitable for exposed waterproof projects of high-standard buildings.

The present application relates to the technical field of carbon material preparation, in particular to a coal-tar pitch-based heteroatom-doped porous carbon, a preparation method and application thereof, a three-dimensional network boron-nitrogen-phosphorus-doped porous carbon is prepared by taking coal-tar pitch as a precursor, boric acid as a boron source, melamine phosphate as a phosphorus-nitrogen source and potassium bicarbonate as an activating agent. By changing the types of raw materials, the pore structure and morphology of the porous carbon material can be regulated, and a unique three-dimensional porous network structure is constructed. The specific surface area of the obtained porous carbon material is between 522 and 1245 m 2 / g, the addition of boric acid and melamine phosphate realizes the doping of boron, nitrogen and phosphorus elements. The obtained porous carbon material has good rate performance and cycle performance as a zinc ion hybrid capacitor electrode material.

The invention provides a halogen-free flame-retardant semiconductive shielding cable material, and belongs to the technical field of cable material preparation. The cable material is prepared from the following raw materials in parts by weight: 40 to 55 parts of low-density polyethylene, 75 to 92 parts of ethylene-vinyl acetate copolymer, 5 to 85 parts of mesoporous SiO2 loaded with a conductive agent and a flame retardant, 2 to 4 parts of tetra [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, 2 to 6 parts of zinc stearate and 5 to 8 parts of epoxidized soybean oil. The mesoporous SiO loaded with the conductive agent and the flame retardant is prepared from the following raw materials: single-walled carbon nanotubes, graphene nanosheets, conductive carbon black, sodium dodecyl benzene sulfonate, melamine phosphate, zinc borate and modified mesoporous SiO; the modified mesoporous SiO is characterized in that gamma-aminoethyl aminopropyl trimethoxy silane and alkyl glycoside are used as modifiers. The flame-retardant cable material is good in flame retardance, high in strength and relatively good in electrical property.

The invention relates to the technical field of cables, and provides a high-temperature-resistant flame-retardant cable which sequentially comprises a conductor, an insulating layer and a sheath layer from inside to outside, and the sheath layer is prepared from the following raw materials in parts by weight: 70 parts of a composite polyethylene material, 6-12 parts of polypropylene, 5-10 parts of an ethylene-vinyl acetate copolymer, 10-20 parts of mullite powder, 1-2 parts of an antioxidant, 1-3 parts of a plasticizer and 8-12 parts of a flame retardant; the preparation method of the composite polyethylene material comprises the following steps: A1, uniformly mixing dolomite powder, melamine phosphate and erythritol, and carrying out ball milling to obtain a blend; a2, the blend and polyethylene are blended and extruded, and the composite polyethylene material is obtained. According to the technical scheme, the problem that the flame retardant property of the cable sheath layer is poor in the prior art is solved.

A thermoplastic composition including: a polyester including a poly(alkylene arylate); optionally, a polyetherimide; a flame retardant composition comprising a dialkyl phosphinic acid salt, and optionally; optionally an auxiliary flame retardant comprising melamine polyphosphate, melamine cyanurate, melamine pyrophosphate, melamine phosphate, or a combination thereof; a mineral flame retardant synergist comprising a modified fibrillated magnesium silicate, a modified fibrillated aluminum silicate, or a combination thereof; optionally, glass fibers; and optionally, an additive composition; wherein the sum of the wt% of the polyester, the flame retardant composition, the mineral flame retardant synergist, the optional polyetherimide, the optional glass fibers, and the optional additive composition total 100 wt%, and wherein the thermoplastic composition comprises 1500 ppm or less of intentionally added fluorine, and a sample of the thermoplastic composition exhibits a UL 94 flame test rating of V-0 at a thickness of 1.5 mm.

The invention relates to the technical field of ship inner cabin coatings, and particularly discloses a water-based inner cabin coating based on nano titanium dioxide and a phosphorus-nitrogen synergistic flame-retardant system and a preparation method of the water-based inner cabin coating. The water-based inner cabin coating based on the nano titanium dioxide and the phosphorus-nitrogen synergistic flame-retardant system is prepared from the following raw materials in parts by weight: 5 to 10 parts of nano titanium dioxide, 10 to 15 parts of a phosphorus-nitrogen composite flame retardant, 60 to 70 parts of water-based acrylate resin and 5 to 10 parts of filler, the phosphorus-nitrogen composite flame retardant is prepared from melamine phosphate and triphenyl phosphate; the coating prepared by the invention has a relatively good flame-retardant effect under the synergistic effect of all the components.

This invention discloses a method for preparing piperazine pyrophosphate using wet-process phosphoric acid, relating to the field of flame retardant technology. Unconcentrated wet-process phosphoric acid is reacted with melamine to obtain a first slurry containing melamine phosphate salt. The first slurry is separated, impurities removed, and then reacted with piperazine to obtain a second slurry containing piperazine diphosphate. After solid-liquid separation of the second slurry, the filtrate is crystallized, and the crystals are dehydrated under a nitrogen atmosphere to obtain the piperazine pyrophosphate. Using unconcentrated wet-process phosphoric acid as a raw material to synthesize piperazine pyrophosphate is inexpensive, stable, and easier to operate than traditional phosphoric acid methods. In the reaction process, the wet-process phosphoric acid is first reacted with melamine to generate melamine phosphate salt as an intermediate, thereby effectively reducing impurity ions present in the wet-process phosphoric acid and improving the purity of the product. After reacting with piperazine, the filtrate is crystallized and dehydrated at high temperature to obtain piperazine pyrophosphate, without affecting its performance as a flame retardant material.

The present invention discloses a thermoplastic polyolefin elastomer composition and an artificial leather thereof. The thermoplastic polyolefin elastomer composition comprises a polymer composition, and the polymer composition comprises a polyolefin resin or a mixture of a polyolefin resin and a rubber elastomer. The thermoplastic polyolefin elastomer composition comprises a halogen-free flame retardant, and the halogen-free flame retardant comprises aluminum diethylphosphinate, piperazine pyrophosphate, and melamine polyphosphate. According to the present invention, flame retardancy of the thermoplastic polyolefin elastomer composition and the artificial leather prepared therefrom is improved by compound use of the three, that is, the aluminum diethylphosphinate, the piperazine pyrophosphate, and the melamine polyphosphate, thereby meeting requirements for safety and environmental protection.

The application provides a kind of supramolecular self-assembly uranium adsorbent and its preparation method and application, the preparation raw material of the uranium adsorbent includes melamine, cyanuric acid and melamine phosphate, by selecting the three substances of melamine, cyanuric acid and melamine phosphate to carry out supramolecular self-assembly, the obtained uranium adsorbent can have high adsorption capacity, high adsorption rate and higher selectivity, and the preparation raw material is low in price and simple in preparation process, suitable for application in seawater uranium extraction.

This invention discloses a flame-retardant non-isocyanate polyurethane (NIPU) foam, its preparation method, and its applications, belonging to the field of polymer foam material technology. This invention uses melamine phosphate as a reactive monomer, with its primary amine groups participating in the construction of the polymer network. Phosphorus-nitrogen flame-retardant units are introduced into the polyurethane backbone through covalent bonds, solving the migration problem of traditional additive flame retardants. This invention utilizes the cascade exothermic effect of the ammonolysis reaction and the epoxy ring-opening reaction to trigger the hydrolysis of cyclic carbonates to generate carbon dioxide gas, achieving a room-temperature self-foaming process without external heating, thus reducing energy consumption. The resulting NIPU foam exhibits excellent flame-retardant properties (limiting oxygen index >27%, vertical burning rating reaching V-0), high char residue, low heat release, and low smoke release characteristics, providing a new technical approach for the preparation of green, safe, and high-performance polyurethane foam materials.

The application relates to a preparation method of nitrogen-phosphorus co-doped carbon encapsulated MoO3-Mo2C heterostructure material for water treatment, in particular to the following steps: mixing alpha-MoO3 powder and H2O2, hydrothermally synthesizing alpha-MoO3 nanosheets; dispersing the alpha-MoO3 nanosheets in water, mixing and dispersing glucose and melamine phosphate in water, mixing the two aqueous solutions, putting foamed NiFe into the mixed solution, heating and evaporating water under oil bath conditions to form a slurry material, then putting the slurry material into a tube furnace, and roasting under Ar atmosphere to obtain nitrogen-phosphorus co-doped carbon encapsulated MoO3-Mo2C heterostructure material; and the application of the prepared nitrogen-phosphorus co-doped carbon encapsulated MoO3-Mo2C heterostructure material in a water treatment reaction.

The present invention provides a macromolecular phosphorus-nitrogen flame retardant composite material, its preparation method and application, belonging to the technical field of flame retardants. By introducing a metal catalyst, a multi-functional cross-linking agent and a synergist into the piperazine pyrophosphate and melamine phosphate system, the present invention synthesizes a new type of weather-resistant intumescent flame retardant. The present invention provides a new method and a new formulation for the intumescent flame retardant system, improves the flame retardant effect of the phosphorus-nitrogen intumescent flame retardant in polypropylene materials, improves the dispersibility and water resistance of the flame retardant in the substrate, reduces the addition amount of the flame retardant, and also improves the migration resistance of the white powdery phosphorus-nitrogen intumescent flame retardant in dark polypropylene materials. The present invention has important application prospects in the field of flame retardant materials and may promote the development and innovation of the industry.

The invention relates to a steel structure fireproof material and a preparation method thereof, and belongs to the technical field of steel structure fireproof materials. The modified fireproof material is prepared from the following raw materials by weight: 25 to 40 mL of modified perchloro-ethylene resin, 10 to 25 g of calcium silicate, 15 to 30 mL of polyaluminosiloxane, 9 to 20 g of glass fiber, 16 to 32 g of melamine phosphate, 15 to 25 g of aluminum hydroxide, 6 to 11 g of expandable graphite, 10 to 20 g of perlite and 16 to 35 g of talcum powder. The prepared modified fireproof material effectively improves the toxicity brought by the material during combustion, also improves the mechanical properties, has high toughness, tensile strength and impact strength, also improves the thermal deformation temperature, blocks heat transfer, and has stronger durability. The modified fireproof material realizes technical innovation, advances from single protection to high performance and multiple functions, and pays more attention to environmental protection, durability and heat insulation of the material.

The application provides a battery fireproof partition plate and a preparation method thereof, a battery module and a new energy vehicle. The battery fireproof partition plate comprises a high-temperature heat-resistant insulating sheet, and the high-temperature heat-resistant insulating sheet is arranged on the outer side of a modified polyurethane fireproof core plate. The modified polyurethane fireproof core plate comprises component A and component B. Component A comprises 30-50 parts of medium-functionality polyether polyol, 1-5 parts of a catalyst, 1-10 parts of an organic phosphate, 10-25 parts of melamine phosphate, 1-10 parts of a low-functionality chain extender, 1-10 parts of pentaerythritol, 1-10 parts of aluminum hydroxide, 1-10 parts of hollow glass microbeads and 1-5 parts of a smoke suppressant. Component B comprises 20-40 parts of an isocyanate mixture. The battery fireproof partition plate not only has a good mechanical protection effect, but also improves the fireproof and heat insulation performance of the battery fireproof partition plate, that is, the fireproof and heat insulation time of the battery fireproof partition plate is 300 s at a temperature above 1300 DEG C, thereby effectively preventing the flame energy from spreading to the surrounding.

The application relates to the technical field of conveying belts, and particularly discloses a halogen-free rubber conveying belt rubber compound and a preparation method thereof. The halogen-free rubber conveying belt rubber compound comprises the following raw materials in parts by weight: 15-25 parts of natural rubber; 45-55 parts of styrene-butadiene rubber; 25-35 parts of butadiene rubber; 50-100 parts of a halogen-free flame retardant; 50-80 parts of a filler; 2-5 parts of a vulcanizing agent; and 5-15 parts of an additive. The halogen-free flame retardant comprises ammonium polyphosphate, magnesium hydroxide, zinc borate, melamine phosphate, a flame retardant MB202 and diphenyl isooctyl phosphate. The preparation method comprises the following steps: S1, raw material preparation; and S2, rubber compound preparation. The halogen-free rubber conveying belt rubber compound can be used in the conveying belts for materials in the fields of coal transportation, mining, metallurgy and chemical industry, and has the advantages of high-temperature resistance, high mechanical performance, long service life and the like.

The invention provides a method for preparing melamine polyphosphate at low temperature, and relates to the field of melamine polyphosphate. The method for preparing melamine polyphosphate at low temperature comprises the following steps: dispersing polyphosphoric acid, reacting at low temperature and post-treating. The method for preparing melamine polyphosphate at low temperature can solve the problems of high intermediate dehydration temperature, complex process, high production cost and energy consumption, poor product chromaticity and stability, difficult solvent recovery and prominent safety and environmental protection risks in the existing production process; the melamine polyphosphate with good chromaticity and stability can be prepared in one step on the premise that high-temperature dehydration and solvent recovery are not needed, the process is simple and controllable, the production cost is low and the equipment requirement is low.

The application provides a deep anti-seepage reinforcing material and a preparation method and application thereof, and belongs to the technical field of composite materials. Modified nano silicon dioxide prepared by hydrolysis modification of polymethyl hydrogen siloxane is mixed with a premixing material, the premixing material is obtained by pre-polymerization reaction of hyperbranched flame-retardant polyester generated by polyphosphoric melamine / tripolymer graphite composite reaction, polyether polyol and isocyanate, and then pouring, curing and obtaining the deep anti-seepage reinforcing material. The application prepares a polyurethane-based deep anti-seepage reinforcing material, which has strong cementation performance, good toughness, good durability, excellent mechanical properties, good flame retardance and good heat conduction performance.

The invention discloses flame-retardant plastic and a preparation method thereof, and belongs to the field of engineering plastics, the flame-retardant plastic comprises ABS, a compatilizer, a flexibilizer, a flame retardant, modified polybutylene terephthalate and an antioxidant, and the flame retardant comprises a covalent flame retardant composed of plasma fluorinated phosphazene boron nitride and a graphene nanosheet-melamine phosphate hybrid. The flame-retardant plastic prepared by the invention has excellent flame retardance and impact resistance.

The invention belongs to the technical field of solid waste recycling and wastewater treatment, and particularly relates to a method for combined treatment of organic amine flue gas desulfurization residues and chromium-containing wastewater. According to the method, organic amine flue gas desulfurization residues are used as a reducing agent, phosphoric acid is used for controlling the pH value of wastewater, hexavalent chromium is reduced into trivalent chromium under the acidic condition, meanwhile, desulfurization ash is converted into a melamine phosphate flame-retardant material, and trivalent chromium is separated from water in a precipitation form under the neutral condition; and roasting the precipitate to obtain chromium sesquioxide powder with relatively high purity, and separating and recovering excessive phosphate radicals from the wastewater in the form of calcium phosphate. While the flue gas desulfurization slag and the chromium-containing wastewater are treated, melamine phosphate, chromium trioxide and calcium phosphate byproducts can be recovered, the treatment cost of the wastewater and solid wastes is reduced, and cyclic utilization of resources is realized.

The invention discloses flame-retardant non-isocyanate polyurethane (NIPU) foam and a preparation method and application thereof, and belongs to the technical field of polymer foam materials.Melamine phosphate serves as a reaction monomer, a primary amine group of the melamine phosphate participates in polymer network construction, a phosphorus-nitrogen flame-retardant unit is introduced into a polyurethane framework through a covalent bond, and the flame-retardant NIPU foam is prepared; and the migration problem of the traditional additive flame retardant is solved. According to the method, the hydrolysis of the cyclic carbonate is triggered to generate the carbon dioxide gas by utilizing the cascade heat release effect of the aminolysis reaction and the epoxy ring-opening reaction, so that the room-temperature self-foaming process without external heating is realized, and the energy consumption is reduced. The obtained NIPU foam has excellent flame retardance (the limit oxygen index gt is 27%, and the vertical combustion grade reaches V-0 grade), high carbon yield and low heat release and smoke release characteristics, and a new technical approach is provided for preparation of a green, safe and high-performance polyurethane foam material.