196results about How to "High in phosphorus" patented technology

The present invention provides a flame-retardant resin composition having high flame retardancy without using any halogen compound and suited for printed circuit boards. Specifically, it provides a flame-retardant resin composition containing as its essential constituents:(A) a novolak epoxy resin,(B) a novolak resin, and(C) a phosphorus compound reactable with said epoxy resin or novolak resin,and also provides prepregs and laminates or copper-clad laminates using this resin composition.

The invention discloses a polymer type phosphorous flame retardant containing 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and a preparation method thereof. The invention is characterized in that: according to a reaction mole ratio, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide-modified aryl dihydric phenol or 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide-modified aryl dihydric alcohol and substituted phosphate dichloride are heated to 75DEG C to 80DEG C in anhydrous acetonitrile under inert atmosphere, stirred to react until halogen-free hydrogen gas is released, cooled to the room temperature and depressurized to remove solvent; the limited oxygen index of the obtained product in flame-retardant epoxy resin is greatly increased, and the vertical burning scale reaches V-0; and the flame retardant overcomes the defects of the conventional micromolecular phosphorous flame retardant, i.e. low thermal decomposition temperature, poor compatibility with polymeric matrix and easy migration, contains higher phosphorus content than the conventional polymer type phosphorous flame retardant, and has good intumescence and char formation property and good flame-retarding effect.

A hot-rolled austenitic manganese steel strip having a chemical composition in percent by weight of 0.4%≦C≦1.2%, 12.0%≦Mn≦25.0%, P≧0.01% and Al≦0.05% has a product of elongation at break in % and tensile strength in MPa of above 65,000 MPa %, in particular above 70,000 MPa %. A cold-rolled austenitic manganese steel strip having the same chemical composition achieves a product of elongation at break in % and tensile strength in MPa of above 75,000 MPa %, in particular above 80,000 MPa %.

The invention provides a technology and a method for treating urban sewage by three-section short-cut nitrification / anaerobic ammonia oxidation, and belongs to the technical field of biological treatment of sewage. A raw water tank, an organic substance removal sequencing batch reactor (SBR), a first regulating water tank, a short-cut nitrification SBR (provided with an on-line monitoring and feedback control system), a second regulating water tank and an autotrophic nitrogen removal up-flow anaerobic sludge bed / blanket (UASB) reactor are sequentially connected in series in the technology; and the sludge is separated according to the sludge age, so that the contradiction between denitrification and phosphorus removal sludge age is solved. By applying the real-time control technology of the short-cut nitrification SBR to the autotrophic nitrogen removal technology, the problems that the half short-cut of low ammonia nitrogen short-cut nitrification in continuous flow is difficult to maintain, the concentration ratio of ammonia nitrogen to nitrous in the effluent is difficult to control and the like are solved. By successfully applying the anaerobic ammonia oxidation technology todeep denitrification treatment of the domestic sewage, urban sewage treatment with high efficiency and low energy consumption is realized.

The invention relates to a livestock and poultry breeding wastewater treatment technology. The livestock and poultry breeding wastewater treatment technology comprises the steps that water in a septic tank enters an artificial grid, so that impurities are removed, and then water enters an adjusting tank; wastewater in the adjusting tank is lifted by a lift pump to enter a cavitation air floatation tank, a flocculating agent is added so as to generate flocculent precipitates, the wastewater flows into an anaerobic tank, phosphorus contained in phosphorus accumulating bacteria is released, the wastewater flows into a tank A, water flowing out of the tank A flows into a contact oxidation tank, and organic matters in the wastewater are oxidized and decomposed; the wastewater flows into a secondary sedimentation tank and is subjected to solid-liquid separation, precipitated liquid supernatant enters a disinfecting tank, ClO2 is added to the disinfection tank for disinfection, and yielding water reaching the standards is discharged through a standardized exhaust port; and the sludge treatment is carried out. The livestock and poultry breeding wastewater treatment technology has the advantages that the technological process is simple, the anaerobic biochemical treatment and the aerobiotic biochemical treatment are combined, nitrogen and phosphorus are removed; sludge is rich in phosphorus and has very high fertilizer efficiency; and the comprehensive energy consumption is low, the high-efficiency energy conservation is realized, the shock resistance is strong, the control requirements are low, and the secondary pollution is avoided.

The present invention provides a double-functional lithium battery electrolyte additive and a preparation method thereof, and relates to the lithium battery electrolyte. The present invention provides the double-functional lithium battery electrolyte additive and the preparation method thereof, wherein the double-functional lithium battery electrolyte additive has a flame retardant performance, even a totally non-combustible characteristic. The double-functional lithium battery electrolyte additive is alkenyl phosphate. Phosphite trimester and alkenyl alkylogen are used as raw materials and react in organic solvent for preparing the double-functional lithium battery electrolyte additive. The double-functional lithium battery electrolyte additive and the routine lithium ion battery electrolyte can form the lithium ion battery electrolyte with double functions. The double-functional lithium battery electrolyte additive belongs to a double-functional additive and has the advantages of: higher phosphorus content and better flame retardation effect, wherein the existence of double bonds causes prior film forming of the double-functional lithium battery electrolyte additive in a discharging process. Compatibility between the electrolyte and a cathode is improved, and thermal stability of the cathode SEI layer is obtained.

The invention discloses a reactive phosphorus flame retardant containing DOPO and an active double bond and a preparation method and application thereof. Dichloro replaces phosphate to react with polyhydric alcohols or polyhydric phenol acidifying with propylene or partial methyl propene and then with DOPO modified aryl-dihydric phenol and DOPO modified aryl-dihydric alcohol, and a reactive flame retardant monomer molecule capable of being cured and provided with active double bonds and a DOPO flame retardant group are obtained and can be used in various flame retardants of epoxyacrylates and unsaturated polyester resins and the like containing unsaturated double bond polymer resins. The flame retardant overcomes defects that the compatibility between an additive flame retardant and a matrix is poor, the additive flame retardant and the matrix are easy to lose, the water resistance is poor, and the like, and the LOI (limit oxygen index) value of resins can be improved remarkably and the flame-resistant effect is good when the flame retardant is used for flame retarding in the epoxyacrylates and the unsaturated polyester resins.

The invention discloses a sludge dephosphorizing and denitrifying biological disposing method, which comprises the following parts: adsorbing pool, sedimenting pool, regenerating pool, selecting pool, dephosphorizing pool, nitrated pool, denitrifying pool and hydrolytic acidifying pool, wherein the effluent enters in the adsorbing pool firstly to blend with reflux sludge in the selecting pool; the blending liquid is drained from adsorbing pool to sedimenting pool to separate mud from water; the supernatant enters into nitrated pool to denitrify in the denitrifying pool to drain; the sediment part of sludge is proceeded anaerobic hydrolysis in the hydrolytic acidifying pool; the supernatant is inputted into dephosphorizing pool to proceed chemical dephosphorizing; the other part of sediment pool refluxes sludge into selecting pool under anaerobic environment; the composite liquid from selecting pool is input in the regenerating pool; the other part supernatant from dephosphorizing pool is input in the denitrifying pool to accelerate denitrifying action.

The invention discloses a granule sludge and biological film coupled integrated sewage treatment method and a treatment device suitable for the same. A reactor is internally filled with granule sludge, suspended sludge and filler, wherein a biological film is formed on the filler; the granule sludge is coupled with the suspended sludge and the biological film by utilizing the high efficiency of the granule sludge; meanwhile, a micro-aerobic aeration environment is provided at a proper position in the reactor, and an anaerobic region, an anoxic region and an aerobic region are formed in the reactor, so that an anaerobic microenvironment, an anoxic microenvironment and an aerobic microenvironment are coupled; in addition, the double circulation that part of sludge in the anaerobic region returns to the aerobic region and part of sludge in the aerobic region returns to the anaerobic region is provided, and a proper quantity of sludge in the aerobic region is discharged, so that the synchronous and efficient removal of COD, N, P and the like in sewage is finally realized.

A low-smelting-point CuP-base intermediate alloy contains Cu, P, Si, Ni, Sb, Bi, Mn and Ag, and is prepared through proportioning pure Cu, red P, crystal Si, electrolytic Ni, pure Sb, pure Bi, and electrolytic Mn and Ag, pulverizing crystal Si, mixing with red P, wrapping by Cu foil, smelting electrolytic pure Cu, sequentially adding others, stirring, and casting ingot or atomizing to become particles. Its advantages are no pollution, low density and smelting point, and stable modifying effect.

Solid carrier-based microbial inoculants can be advantageously used for natural phosphorous supply of plant, biological control of soil born plant pathogens, biological degradation of organic contaminants, soil life and fertility improvement which solid carrier containing phosphorus, made of animal bone charcoal, and having grain size advantageously between 0.001 mm and 10 mm, pore size between 10 and 60,000 nanometer, macro porous structured, the specific area is between 1 and 500 m2 / g, and the external and / or internal surface and / or internal pores are biologically active colonized with aerobic soil microorganisms under less than 30 degree Celsius temperature. Also described is a method for manufacturing and application of Nitrogen free solid carrier-based microbial inoculants which carrier is produced from animal bone by carbonisation process between 300 degree Celsius and 1000 degrees Celsius material core temperature in absence of ocygen, followed by cooling to below 50 degrees Celsius core temperature.

The invention discloses an efficient denitrification, dephosphorization, denitrification and phosphorus resource recycling process for urban sewage. The process comprises the following steps of: adding the sewage into an anaerobic pond; adding the sewage into a first sedimentation basin for sludge and water separation, adding sludge into an oxygen-poor pond across a nitrification pond, adding a part of supernatant into an induced crystallization reactor for dephosphorization, adding the part of dephosphorized supernatant into the nitrification pond, directly adding the other part of supernatant into the nitrification pond and converting ammonia nitrogen in the supernatant into nitrate; adding the sewage in the nitrification pond into a second sedimentation basin for sludge and water separation, adding the supernatant into the oxygen-poor pond for finishing phosphorus absorption and denitrification, making a part of sludge flow back into the nitrification pond and discharging the residual sludge; and adding the sewage into an aeration basin from the oxygen-poor pond and adding into a final clarifier from the aeration basin for sludge and water separation, discharging the supernatant, making a part of sludge flow back into the anaerobic pond and discharging the residual sludge. After being treated by the process, discharged water directly reach a first grade A standard of a pollutant discharge standard for municipal sewage treatment plants, and has extremely high dephosphorization and denitrification efficiencies.

The invention discloses a durable anti-flaming anti-microbial mould-proof fabric. The durable anti-flaming anti-microbial mould-proof fabric contains an anti-flaming dacron fabric and an anti-microbial agent, a mould-proof agent, an anti-flaming synergist, a photocatalyst and a penetrating agent which are combined with the anti-flaming dacron fabric in a physical manner and chemical manner, wherein the physical manner is to combine through the cementing action of the anti-flaming macromolecule adhesive and the chemical manner is to bond through the crosslinking by generating NCO by de-blocking the phosphorus containing blocking type polyurethane prepolymer at high temperature. The durable anti-flaming anti-microbial mould-proof fabric provided by the invention still has excellent anti-microbial mould-proof performances after being washed for 40 times with water, and formaldehyde can be removed. The anti-flaming performance after the fabric is washed for 50 times with water still can meet the GB8624-2012 B1 level and GB20286-2006 anti-flaming level 1 requirements.

The invention discloses halogen-free and flame-retardant hard polyurethane foam plastic and a preparation method thereof, relating to foam plastic. Raw materials include polyether polyol 4110, polymethylene polyphenyl isocyanate, a tertiary amine catalyst, dibutyltin dilaurate, a silicon-carbon bond foam stabilizer, 2,4,6-tri(dimethylaminomethyl)phenol, a foaming agent, octa-(3-hydroxyl-3-methyl butyl dimethylsiloxy)silsesquioxane, dimethyl methylphosphonate and micron-sized alpha-alumina trihydrate. The method comprises the following steps of: mixing the polyether polyol 4110, tertiary aminecatalyst, dibutyltin dilaurate, silicon-carbon bond foam stabilizer, 2,4,6-tri(dimethylaminomethyl)phenol, foaming agent, octa-(3-hydroxyl-3-methyl butyl dimethylsiloxy)silsesquioxane and micron-sized alpha-alumina trihydrate to obtain A; adding the dimethyl methylphosphonate into A to obtain B; and adding the polymethylene polyphenyl isocyanate into B, pouring into a mold for foaming, curing anddemolding to obtain the halogen-free and flame-retardant hard polyurethane foam plastic.

The invention relates to a hydroxyl-containing liquid phosphor-nitrogen fire retardant and a preparation method thereof, and belongs to the technical field of flame retardation. The preparation method comprises that hexachlorocyclotriphosphazene, p-hydroxybenzaldehyde and an acid binding agent are added into an organic solvent and undergo a heating reflux reaction, the reaction product is subjected to aftertreatment to form white solid powder hexa(4-formylphenoxy)cyclotriphosphazene, the hexa(4-formylphenoxy)cyclotriphosphazene, diethyl phosphite and triethylamine undergo a heating reflux reaction in an organic solvent, and the reaction product is subjected to reduced pressure distillation so that the organic solvent, diethyl phosphite and the catalyst are removed and a hexa(4-diethyl phosphate hydroxymethylphenoxy)cyclotriphosphazene fire retardant is obtained.

The invention discloses halloysite with a modified surface and a preparation method for the halloysite. A modification object is hyperbranched polysiloxane containing phosphorus and an epoxy group, and the phosphorus content of the modification object is more than 14.5 weight percent. The preparation method comprises the following steps of: mixing 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, a vinyl-containing silane coupling agent, an initiator and a solvent, mixing an obtained phosphaphenanthrene silane coupling agent, a silane coupling agent containing an epoxy resin, a catalyst anda solvent, reacting to obtain hyperbranched polysiloxane containing phosphaphenanthrene and the epoxy group, and reacting activated halloysite and the hyperbranched polysiloxane in a solvent to obtain the halloysite with the modified surface. The halloysite with the modified surface has a large number of active groups and a hyperbranched topological structure, has high dispersity in resin matrixes, and has a broad application prospect in the fields of polymer modification, synthesis and preparation of novel polymer materials and multifunctionalization of nano-clay / polymer composite materials.

The invention discloses a phosphorous and nitrogenous UV-cured flame retardant and a preparation method thereof. According to the invention, phosphorus and nitrogen compound precursor with high phosphorus content is synthesized by using raw materials of alcamines compound, aldehydes compound, and dialkyl phosphite through Kabachnik-Fields reaction; a light-cured monomer containing phosphorus and nitrogen elements is prepared through substitution / esterification reaction of the precursor with (methyl) acryloyl chloride or (methyl) propenoic acid by utilizing active hydroxy of the precursor; the monomer is used as reaction type flame retardant to be applied to light-cured resin matrix, and can curve rapidly with matrix under UV lighting to form a flame-retarded light-cured material which not only has good flame retardant property, but also can reduce the transfer and loss of the flame retardant in the using process. Compared with a conventional additive flame retardant, the compatibility of the flame retardant and the macromolecule matrix is also increased, and the duration of the flame retardant property of the material can be guaranteed.

The invention relates to a system and a method for removing phosphorus by three-mud process nitrification and denitrification. The system comprises a pretreating unit, an anaerobic unit, a middle precipitation unit, a primary aeration biological nitrification unit, an anoxic unit, a secondary precipitation unit and a secondary aeration biological nitrification unit. The method comprises the following steps that: after being precipitated in the pretreating unit for removing oil, the primary water enters an anaerobic pool with returned sludge to anaerobicly release the phosphorus; microorganisms absorb polyhydroxyrate (PHB) in a dissoluble organic compound body in the water; after muddy water is precipitated in a middle precipitation pool, a supernatant enters the primary aeration biological nitrification unit and an effluent and sludge in the middle precipitation pool enter an anaerobic pool to undergo denitrification and dephosphorization; and after mixed solution in the anaerobic pool is separated in a secondary precipitation pool, the supernatant enters the secondary aeration biological nitrification unit for further treatment, wherein one part of the sludge is reclaimed and theother parts of the sludge are discharged as remaining sludge. The system of the invention is small in occupied area and low in basic construction and operation costs. For low-carbon and nitrogen urban sewage, the effluent of the system can stably meet the first grade A standards of Urban Sewage Disposal Plant Contamination Integrated Discharge Standard.

The invention discloses trapezoidal polysiloxane and a preparation method thereof. The preparation method comprises the following steps of: preparing phosphaphenanthrene trialkoxysilane, then reasonably selecting another silane coupling agent containing an active group, adopting a direct mixed hydrolysis method and preparing the trapezoidal polysiloxane by controlling the hydrolysis rate of a system in stages. According to the preparation method, the existing process which needs to use a removal type template is abandoned, the process of removing the template in post-treatment is effectively avoided, the operation process is simplified, and the yield is improved. The proportion of phosphaphenanthrene to the active group can be controlled by controlling the adding amount of two monomers, the structure of the trapezoidal polysiloxane can be regulated and controlled against the specific application demands, and the application prospects are wider. The trapezoidal polysiloxane provided by the invention contains a large proportion of the phosphaphenanthrene structure so as to be favorable for achieving high flame resistance under low content; and the prepared trapezoidal polysiloxane contains an amino group, so that the trapezoidal polysiloxane has broad application prospects in multiple functions and high performance of polymers, synthesis and preparation of novel high polymer materials and the other aspects.

The invention relates to a curing agent and a preparation method, in particular to a halogen-free curing agent capable of being used for curing an epoxy resin and a preparation method thereof, belonging to the technical field of the macromolecular compounds. In the invention, phosphorus element is introduced into aromatic aldehyde to form a phosphorus-containing phenolic aldehyde by modifying the curing agent and using organic phosphorus as a flame retardant, thereby the flame retardation and thermal stability of epoxy resin can be improved when in use. The invention has the advantages of simple preparation method, little pollution in the synthesis process, no poisonous gas generation in burning and no harm to human bodies. The prepared phosphorus-containing phenolic aldehyde is an environment-friendly product which has high phosphorus content, excellent flame retardation and heat-resistant property and can meet the halogen-free and lead-free requirement.

A method for dephosphorizing and denitriding induced crystallization sewage by a double-sludge system relates to the sewage treatment hard technology in environmental engineering, in particular to the economic and practical advanced technology applied to the dephosphorization and denitrification of domestic sewage and municipal sewage. The method is based on two independent sludge systems which are respectively a nitrobacteria sludge system formed by a nitrification tank (4) and a sedimentation tank (5) and a denitrification phosphorus accumulating sludge system formed by an anaerobic tank (1), a sedimentation tank (2), a hypoxia tank (6), a post aeration tank (7) and an end sedimentation tank (8); after denitrification phosphorus accumulating bacterial sludge finishes anaerobic phosphorus release in the anaerobic phosphorus release tank (1), sludge-water separation is carried out in the sedimentation tank (2), the sludge enters the hypoxia tank (6), and only the supernatant fluid enters the follow-up treatment unit; the sludge which is discharged into the hypoxia tank (6) undergoes denitrifying dephosphorization and denitrification and enters the end sedimentation tank (8) through the post aeration tank (7); and after precipitation and sludge-water separation, the phosphorus accumulating sludge enters the anaerobic phosphorus release tank (1) again to release phosphorus, and then the cycle goes on.

The invention discloses a layer by layer self-assembling anti-flaming cotton fabric. A preparation method of the layer by layer self-assembling anti-flaming cotton fabric comprises the following steps: (1) preparing a polycation sol; (2) preparing an anion solution; (3) pre-treating the cotton fabric; (4) preparing the anti-flaming cotton fabric. The polycation sol and the anion solution adopted by the invention have a certain synergistic effect for resisting against fire; the reaction condition is mild; the process is simple; the operation is convenient; the method is green and pollution-free.

The invention relates to a halogen-free inflaming retarding type micro-foaming full-plastic wood-simulating material and a preparation method thereof and relates to a micro-foaming full-plastic wood-simulating material. The full-plastic wood-simulating material comprises the following components in mass ratio: 100 of polystyrene, 20-40 of high impact polystyrene, 10-15 of resin, 2-5 of inorganic filling material, 30-60 of halogen-free inflaming retarding agent, 10-20 of smoke inhibiting agent, 0.5-1.5 of foaming agent, 0.5-2 of cell regulating agent, 0.5-2 of coloring agent and 1.5-3 of auxiliaries. The preparation method comprises the following steps: mixing the auxiliaries, the coloring agent, the halogen-free inflaming retarding agent, the smoke inhibiting agent, the foaming agent and the cell regulating agent in the component proportion so as to obtain a mixed material A; drying the resin and the inorganic filling material and mixing polystyrene, high impact polystyrene, the resin, the inorganic filling material and the mixed material A, so as to obtain a mixed material B; and granulating the mixed material B, and shaping the obtained particle material, so as to obtain the halogen-free inflaming retarding type micro-foaming full-plastic wood-simulating material.

The invention publishes a phosphoric flame-resistant additive which is used in the solution of the lithium ion battery, which is a phosphoric organic compound, its basic structural formula likes right, or is the isometry body of the state structure; of which R1, R2, R3 are alkyl CnH2n+1 or alkene base CnH2n-1, and the carbon atom number of R1, R2, R3 is 1<=n<=4. The application method of the phosphoric flame-resistant additive is adding the phosphoric flame-resistant additive in the ordinary lithium ion battery solution; its quantity is the 5 to 40wt% of the lithium ion battery solution weight. The phosphoric flame-resistant additive has high phosphoric quantity, the good flame-resistant effect, and low viscosity, not only enables the electrolyte to have the good flame retardance, simultaneously has little influence of viscosity, conductivity of electrolyte, has good wettability with positive and negative pole piece and the membrane, and has good charging and discharging performance.

The invention relates to a foaming-type industrial waste residue base compound dephosphorization material. Coal ash, steel slag and adhesive form gelation materials, foaming agent and water are added to form a compound dephosphorization material. The compound dephosphorization material comprises the following components by mass ratio of gelation materials: 75-85 percent of coal ash, 10-20 percent of 70-90 meshes of steel slag, 3-15 percent of adhesive, 0.2-1 percent of foaming agent and 3:1-9:2 of water. The material can protect the environment, realize reclamation of wastes and achieve good social and economic benefits.

The present invention discloses a preparation method of a slow-release phosphorus fertilizer, and a preparation method that is used for a coating material that is used for the slow-release phosphorus fertilizer. The slow-release phosphorus fertilizer is a coated fertilizer that is coated by a coating outside the phosphorus fertilizer; the coating material is made of improved attapulgite. For the improvement of the attapulgite, the attapulgite is improved by dipping the aqueous solution of sodium carbonate or phosphoric acid; then the improved attapulgite is separated, dried and milled for dispersion.

This invention relates to a P-Si intermediate alloy used in refining initial crystal silicons in Al-Si alloy and Mg2Si in Mg-Si alloy and its preparation method, in which, the chemical composition of said intermediate alloy is (wt%): Si 40.0-70.0, P 8.0-25.0 and Ni or Mn for the rest, the preparation steps include: melting pure Si, Ni or Mn raw material in a high temperature smelting furnace, heating red phosphor to 450-520deg.C in a low temperature heat preservation furnace protected by Ar or N2 then to connect the phosphor steam to the bottom of a Si alloy molten bath via a P transport pipe and mixing it to urge the phosphor to be dissolved in the bath then to be cast directly to ingot or atomized to powder.

The invention discloses a P-N-Si ternary synergistic flame retardant. The flame retardant has the structural formula shown in the description, wherein x ranges from 1 to 5 and 6 substituent groups are linked to three phosphorous atoms. The flame retardant can be applied to epoxy resin. P, N and Si elements in molecules of the flame retardant can perform flame retardance independently and also have a synergistic flame retardance effect. The epoxy resin using the flame retardant for flame retardance has the limit oxygen index of 32% at most and has the vertical combustion class of class V-0. The invention also discloses a preparation method of the flame retardant.

The invention discloses high-flame retardant rigid polyurethane foaming plastic and a preparation method thereof. The preparation method comprises the following steps: evenly mixing polyol, a compound flame retardant, a foaming agent, a foam stabilizer and a catalyst to prepare a polyurethane composition A; controlling the material temperature and mould temperature, adding isocyanate into A, and stirring evenly; and pouring the evenly mixed liquid into a mould for foaming to obtain the high-flame retardant rigid polyurethane foaming plastic after foaming and curing. According to the high-flame retardant rigid polyurethane foaming plastic and the preparation method, halogen-free environment-friendly solid flame retardant aluminum hypophosphite, phenyl aluminum hypophosphite, and halogen-free liquid flame retardant dimethyl methylphosphonate are adopted for being compounded with cyclic phosphonate flame retardant to replace a conventional halogen-containing flame retardant, and a dispersant is adopted for enabling the solid-phase flame retardant to be evenly dispersed in the liquid-phase flame retardant, so as to achieve the effect of efficient synergistic flame retardance, effectively solve the problem that ordinary rigid polyurethane foam plastic is poor in flame retardance, meanwhile also maintain various superior performances of PU (Polyurethane) rigid foam.

The invention relates to a preparation method of halogen-free flame retardant polyester phosphorus containing a phosphorus-containing flame retardant monomer. The preparation method includes: according to a mass ratio, adding 100 parts of terephthalic acid, 3.6-15.2 parts of the phosphorus-containing flame retardant monomer, 46.3-54.7 parts of ethylene glycol, 0.035-0.062 part of a catalyst and 0.008-0.015 part of a heat stabilizer into a synthesis reaction kettle, and carrying out a conventional polyester synthesis process to prepare the halogen-free flame retardant polyester with a phosphorus content of 0.8-1.5wt% and an intrinsic viscosity number of 0.63-0.69dL g<-1>. The halogen-free flame retardant polyester provided by the invention has the characteristics of high structural regularity, high degree of crystallinity, and high melting point.