138results about How to "Improve charcoal ability" patented technology

The invention discloses a poly-phosphate flame retardant containing a DOPO side-chain structure and a preparation method thereof, belonging to the technical field of polymeric organic phosphorus flame retardant structures and the preparation method thereof. The flame retardant is characterized by comprising the following repeating unit structure: wherein n=5-50. The preparation method of the poly-phosphate flame retardant comprises the following steps of: reacting an intermediate I containing the DOPO structure with phosphorus oxychloride to obtain an intermediate II containing phosphorus oxychloride, and fusing and polymerizing the intermediate II and a bisphenol compound to obtain the poly-phosphate flame retardant containing the DOPO side-chain structure. The preparation method is simple, and through adjusting Ar categories and ratios, the phosphorus content can be controlled at 11.5-15.5% and the sulfur content can be controlled at 0-5.9%. The flame retardant has the characteristics of favorable thermal stability, high decomposition temperature, favorable char-forming property, and the like, and can be used for flame retardance modification of materials, such as polyester, polyamide, polycarbonate and blends thereof, and the like, with higher processing temperature.

The invention relates to a macromolecular intumescent flame retardant with phosphorus and nitrogen, which is characterized in that: the chemical composition is poly (2, 6 and 7-trioxy-1-phosphorous dicyclic-[2, 2 and 2]-octane-1-anisyl) organic phosphate 4 and 4'-diaminodiphenylmethane; the preparation process is that: 2, 6 and 7-trioxy-1-phosphorous dicyclic-[2, 2 and 2]-octane-1-anisyl is put into the solvent of acetonitrile and dissolved after heating and stirring, and then diamine compound and catalyst are added into the solution, and a temperature reaction is processed under the protection of nitrogen; the solution is filtered when reaction is over to obtain the filter mass after being rinsed and dried. The macromolecular intumescent flame retardant with phosphorus and nitrogen has the advantages of being halogen-free and environment-friendly, big molecular weight, basically solving transplantation, separation, volatilization or other problems on the machineshaping of the flame retardant and the polymer substrate, simple preparation method and operation and higher productive rate of the product.

The present invention discloses a low smoke halogen-free environment-protection fire-retardation type sheet molding compound, which comprises, by weight, 60-80 parts of an unsaturated polyester resin mixture, 20-60 parts of a thermoplastic high molecule polymer slurry, 1-3 parts of an initiator, 2-4 parts of a thickener, 0.02-0.5 part of a polymerization inhibitor, 5-15 parts of a mold release agent, 90-140 parts of a filler, 80-150 parts of aluminum hydroxide powder, 1-10 parts of an organosilicon synergist, 1-8 parts of a smoke suppressant, 5-25 parts of a liner phenol formaldehyde resin, and 80-200 parts of reinforcing fibers. Compared with the conventional fire retardation agent, the low smoke halogen-free environment-protection fire-retardation type sheet molding compound has the following advantages that: a fire retardation performance of the composite material is increased, smoke density during burning is reduced, excellent mechanical properties of the material is maintained, and disadvantages of large smoke density during burning and low comprehensive mechanical performance of the existing fire-retardation sheet molding compound are solved.

The invention discloses a halogen-free high-efficiency flame retardant composition and a preparation method thereof. The halogen-free high-efficiency flame retardant composition is prepared from the following components in percentage by mass: 10-80% of phenyl melamine carboxyethyl phenyl phosphinic acid condensation compound, 15-70% of melamine and / or derivative thereof and 5-20% of organic phosphate. The halogen-free flame retardant composition can be used for flame retarding of various polyolefin, nylon, polyurethane, polyester and other synthetic materials and textiles, and is particularly suitable for polyester and nylon engineering plastic; and by the addition of 12wt% of the flame retardant composition to polybutylene terephthalate (PBT) resin, the flame-retarding level can reach UL 94 V-0 (1.6 mm). The flame retardant composition has the characteristics of high flame retarding efficiency, good fluidity, no precipitation and the like, and can meet the use requirements of flame-retardant resin for electric appliance shells and supports, electronic and electric device connectors and the like.

The invention discloses a flame-retardant polyolefin resin composition and a preparation method thereof, and a flame-retardant tubular product prepared from the flame-retardant polyolefin resin composition. The flame-retardant polyolefin resin composition disclosed by the invention comprises the following components in parts by weight: 100 parts of polyolefin resin, 30-85 parts of antimony bromine composite flame retardants, 2-20 parts of resin modifiers and 0.3-1.5 parts of processing agents. The tubular product prepared from the flame-retardant polyolefin resin composition disclosed by the invention has the advantages of being high in heat resistance (the vicat softening temperature of the material can be up to over 140 DEG C), high in flame retardant property (the oxygen index is greater than over 32), good in hot water resistance, low temperature resistance and long-term static hydraulic performance, long in service life, free of scaling and the like, the vertical combustion can be up to V0 grade, the smoke density SDR is smaller than 75, the damaged tubular product caused by external force can be connected in a hot melting manner, and the flame-retardant tubular product can be applied to products such as a central air conditioning pipe system, industrial water supply and drainage pipelines and the like.

The invention belongs to the field of fire-retardant materials, and discloses a nanocellulose surface-modified core-shell structure fire retardant, and a preparation method and an application of the fire retardant. The nanocellulose surface-modified core-shell structure fire retardant integrates an acid source, an air source and a carbon source and takes ammonium polyphosphate as a core; a polymer capable of serving as the air source is coated on the surface of the core; and carbon-rich structure cellulose is adsorbed on an outermost layer. The fire retardant is an expansive fire retardant and has good fire-retardant efficiency; and a nanocellulose structure is arranged on the surface of the fire retardant, so that the compatibility of the fire retardant in a base material can be improved, and an influence of the traditional fire retardant particle on the mechanical property of a material can be reduced.

The invention relates to a phosphorus-nitrogen-silicon intumescent flame retardant containing a triazine ring and a cage structure and a synthesis method of the intumescent flame retardant. The synthesis method comprises the steps as follows: a solvent is added to a container, phosphorus oxychloride is added and stirred to be dispersed, PEPA (1-oxy phospha-4-(hydroxymethyl)-2,6,7-trioxabicyclo[2.2.2]octane) and an acid-binding agent are dropwise added step by step, and a PEPA-containing unitary substituent is obtained; substances with diamine or dihydric alcohol are added to the other container and mixed with the solvent and the acid-binding agent, the PEPA-containing unitary substituent is slowly dropwise added, and a phosphorous-containing diamine intermediate is obtained after separation; the solvent is added to a container provided with a reflux condenser and the like, cyanuric chloride is added and stirred to be dispersed, an amino silane coupling agent and the acid-binding agent are dropwise added step by step, and a silicon-containing unitary substituent is obtained; the mixture of the phosphorous-containing diamine intermediate and the acid-binding agent is slowly dropwise added, cooling, washing and drying are performed, and a powdery solid, namely, the phosphorus-nitrogen-silicon intumescent flame retardant containing the triazine ring and the cage structure, is obtained. The phosphorus-nitrogen-silicon intumescent flame retardant has the advantages that the flame retardant has certain polymerization degree, high molecular weight, higher charcoal forming amount and better thermal stability, the proportion of acid sources, carbon sources and gas sources in molecular structures is relatively proper and the like.

The invention discloses a triazine ring hexaphenyl phosphate-containing flame retardant and a preparation method thereof, relating to the technical field of preparing halogen-free flame retardant. According to the method, the mole ratio of tri(2-hydroxylethyl)isocyanurate to diphenyl chlorophosphate is 1:(3-3.2) under the condition of an organic solvent, the preparation method comprises the following steps of: sequentially adding tri(2-hydroxylethyl)isocyanurate, solvent, acid-binding agent and a catalyst, dropwise adding diphenyl chlorophosphate solution at -10DEG C to 5DEG C, heating to 20DEG C-25DEG C after the dropwise addition is completed, preserving heat for 2h-8h, after the reaction is finished, decompression-steaming the solvent, then sequentially washing with water and 5wt% sodium carbonate solution, and finally performing vacuum drying. The triazine ring hexaphenyl phosphate-containing synthetic method provided by the invention is simple to operate, low in cost and less in energy consumption; the decomposition temperature of the prepared flame retardant is at 280DEG C-438DEG C, and the prepared flame retardant has better thermal stability and better carbon forming capability.

The invention discloses a polylactic acid / starch expansion flame-resistant composite material with excellent flame resistance, and a preparation method thereof. The polylactic acid / starch expansion flame-resistant composite material is composed of, by weight, 60 to 89% of polylactic acid, 5 to 30% of an acid source, 5 to 30% of a modified starch, and 1 to 15% of a gas source. In a preferred embodiment, the modified starch is phosphorized maleic anhydride grafting modified starch (bio-based phosphorus containing starch). According to the preparation method, polylactic acid possesses excellent compatibility with the modified starch; synergistic effect of the acid source, the carbon source (the modified starch), and the gas source is capable of improving charring forming capability of the polylactic acid matrix, and improving high temperature stability and flame resistance of polylactic acid greatly. According to the preparation method, adoption of an existing double-screw extruder is enough for production; preparation is simple and convenient; and the preparation method is convenient for industrial production.

The invention relates to a thiotriazinone 'phosphorus-silicon-nitrogen' oligomer-form intumescent flame retardant and a synthetic process thereof. The synthetic process is characterized by including the steps of adding a solvent into a container that is fitted with a reflow condenser, a stirrer and a constant-pressure dropper, adding cyanuric chloride, stirring and dispersing, dropwise adding an aminosilane coupling agent and an acid-binding agent to obtain a silicon-bearing unitary substituent; adding a diamine or diol substance into another container, mixing with a solvent and an acid-binding agent, dropwise adding a phosphorus-bearing compound slowly, and separating to obtain a phosphorus-bearing intermediate; dropwise adding the phosphorus-bearing intermediate of step II into a container with the silicon-bearing unitary compound, and dropwise adding an acid-binding agent to obtain a phosphorus-bearing silicon dimer; dropwise adding the phosphorus-bearing silicon dimer, the phosphorus-bearing diamine intermediate, and an acid-binding agent into a reaction container that contains a solvent. The retardant of the invention has the advantages, for instance, the retardant has good char-forming capacity, the retardant can form a greater char layer after combustion, intramolecular flame-retarding synergy is given to play, and the yield reaches 91% and above.

The invention discloses a macromolecular intumescent flame retardant with phosphorus and nitrogen and a synthesis method thereof. The synthesis method comprises the following steps: using acetonitrile as solvent and 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro-3,9-dioxa[5.5]undecane and 2,6-diaminopyridine as raw materials to react under the action of catalyst, and purifying the product to obtain poly(3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro-3,9-dioxa[5.5]undecane)-2,6-diaminopyridine. The method of the invention is simple and is easy to control; the synthetized macromolecular intumescent flame retardant with phosphorus and nitrogen has better compatibility with the matrix and higher char forming characteristic; by adopting the method, the problem of migration, precipitationor volatilization in the machinings of the flame retardant and the polymer matrix can be solved basically; and the flame retardant does not contain halogen, thus the flame retardant is environmentally friendly and has good application prospect.

The invention relates to a low-smoke halogen-free high-flame retardant ethylene propylene rubber material in extrusion molding. A preparation method of the rubber material is as follows: uniformly mixing the di-ethylene propylene rubber and ethylene-vinyl acetate copolymer at 100+ / -10 DEG.C by using an open mill or a internal mixer, cooling to the room temperature, orderly adding carbon black, modified mmicron hydroxide, plasticizer, flame retardant synergist, assistant crosslinker and crosslinking agent in proportion, uniformly mixing, adding the rubber compound in a single-screw extruder, controlling the temperature of the extruder body, the screw and the head at 70-90 DEG.C and the revolving speed of the screw within 20-30r / min (revolutions per minute) so that the rubber can be continuously extruded, heating and forming in a direct vulcanizing tank. The retardant ethylene propylene rubber provided by the invention has the advantages of good dynamic performance, low-smoke halogen-free flame retardance and good extrusion performance, and is adapted to a high-flame retardant rubber seal product.

The invention relates to a reactive flame retardant and particularly relates to a triazine ring-containing phosphorus-nitrogen-silicon compound and a preparation method thereof. The preparation method comprises the following steps: S1, dissolving paraformaldehyde in methanol; adding a potassium carbonate solid; cooling the solution to 0 DEG C; stirring and adding dimethyl phosphate drop by drop; and S2, rising to room temperature, filtering out potassium carbonate after 1 hour, and decompressing and removing methanol from the filtrate to obtain colorless grease, namely an intermediate I. Compared with the prior art, the triazine ring-containing phosphorus-nitrogen-silicon compound provided by the invention has the beneficial effects that 1, three flame retardant elements phosphorus-nitrogen-silicon are integrated in one molecule, so that the heat stability, the charcoal forming property and the flame retardant synergic effect are improved; 2, the synthetic technological conditions are stable, the reaction process is easy to control and the production cost is low, and the compound has a good flame retardant effect under the condition of a small addition amount and can be used for flame retardant treatment of various fabrics.

The invention relates to a method for synthesizing a monomolecular phosphorus-nitrogen expansion flame retardant, which is characterized by: reacting pentaerythritol and phosphorus oxychloride at 80-120°C for 2-12 hours, adding the first solvent during the reaction, and the reaction ends After cooling, filtering, washing, and vacuum drying for 12-24 hours to obtain a white solid, the white solid is 1-oxo-4-hydroxymethyl-1-phospho-hetero-2,6,7-trioxabicyclo [2, 2, 2] octane (PEPA); then add the white solid (PEPA) into the second solvent, stir rapidly to dissolve it, then add isocyanate substances dropwise, and add the catalyst dropwise at the same time, stirring continuously, the reaction The time is 1 to 12 hours, the reaction temperature is 20 to 100°C, the solution changes from clear to turbid, the product is poured into ice water, an appropriate amount of inorganic acid is added dropwise, the pH value is adjusted to be acidic, a white solid is precipitated, and then washed with a washing solvent for 3 The filtered product was vacuum-dried to obtain a white or light yellow solid with a yield of 90-96%. It has the advantages of no halogen, non-toxicity, environmental protection, good application prospects and the like.

The invention relates to a preparation method of a mercapto-alkene polymer flame-retardant system. Polysiloxane and a carbon nano tube belong to fire retardants, and have flame retardant property; according to the preparation method provided by the invention, the polysiloxane is grafted on the carbon nano tube through a chemical bond; the flame retardant properties of the polysiloxane and the carbon nano tube are put into a full play due to the synergistic effect generated between the polysiloxane and the carbon nano tube; meanwhile, ethylene on the polysiloxane is also formed in the polysiloxane-grafted carbon nano tube, and then can participate in copolymerization of mercapto-alkene, so as to form a flame-retardant system; the char-forming property and the flame-retardant property of the polymer can be improved by phenyl in the polysiloxane in a combustion process, so that the flame-retardant property of the flame-retardant system is further improved; the prepared flame-retardant system has the advantages of being stable in structure, migration-resistant, friendly to environment and harmless; the overall structure of the flame-retardant system can be regulated and controlled by adjusting the proportions of various reactants, so as to adjust the flame-retardant property of the product according to the requirements.

The invention discloses an antistatic halogen-free environment-friendly flame-retardant sheet moulding compound and a preparation method thereof. The antistatic halogen-free environment-friendly flame-retardant sheet moulding compound comprises the following components in parts by weight: 70-100 parts of unsaturated polyester resin mixture, 30-60 parts of thermoplastic high-molecular polymer slurry, 1-4 parts of initiator, 2-6 parts of thickener, 0.03-0.8 part of polymerization inhibitor, 4-20 parts of release agent, 50-120 parts of filler, 3-10 parts of antistatic agent, 50-90 parts of aluminum hydroxide powder, 10-30 parts of inrumescent flame retardant, 2-7 parts of anti-smoke agent, 5-30 parts of anti-falling agent and 50-150 parts of reinforced fiber. according to the preparation, graphene is adopted as a novel antistatic agent; the graphene has ultrahigh electric conductivity; and after being treated by a coupling agent, the graphene can be uniformly dispersed in the matrix resin and form a good conducting channel.

The invention belongs to the technical field of polymer composite materials, and relates to a glass fiber reinforced nylon composite material and a preparation method thereof. The composite material is composed of the following components in parts by weight: 100 parts of nylon, 35 to 50 parts of fire retardant, 7.5 to 15 parts of charring agent, 0.2 to 1.0 part of coupling agent, 0.1 to 0.5 part of antioxidant, 0.2 to 1.0 part of lubricant, and 400 to 100 parts of glass fiber. A fire retardant namely melamine polyphosphate is added so as to effectively solve the problem of candle wick effect of glass fiber reinforced nylon, and the modified nylon has the characteristics of strong charring performance, no dripping, no toxicity, and no corrosion. Moreover, a charring agent is added, and a synergetic fire retardant effect is generated by the cooperation of the charring agent and the melamine polyphosphate, so the fire-retardant performance of the nylon composite material is greatly improved.

The invention discloses a preparation method for a flame-retardant anti-dripping polyester fiber. The preparation method is characterized in that polyester chips are dried until the water content is lower than 100 ppm, a phosphorus and silicon-based flame retardant is added to the polyester chips, the mixture of the phosphorus and silicon-based flame retardant and the polyester chips is fed into adouble-screw extruder for melt blending, an extruded melt is granulated by using a granulator, and phosphorus and silicon-based flame retardant modified flame-retardant anti-dripping polyester masterbatch is obtained; the masterbatch is evenly mixed with the polyester chips, the mixture of the masterbatch and the polyester chips is dried until the water content is lower than 100 ppm, and then subjected to melt blending through the double-screw extruder, the melt enters a spinning box, is jetted through spinneret orifices and then enters a spinning channel, and after air cooling, bundling, oiling, drafting, hot setting and winding, the flame-retardant anti-dripping polyester fiber is prepared. The flame-retardant anti-dripping polyester fiber prepared by using the preparation method has excellent flame resistance, the LOI value can reach 34.1%, there is no melt dripping phenomenon during burning, and compared with a pure polyester fiber, the heat release rate and the total heat releaseare greatly reduced.

The invention discloses a method for solving the problems of moisture absorption and stickiness of a fabric with a phosphorus flame retardant coating. The method comprises the following steps: by taking two kinds of silane mixed monomers as modifiers and adopting ammonium hydrolysis in an alcohol medium, preparing silica modified sol, then adding 10-20% of phosphorus flame retardants and obtaining a phosphorus-silicon synergistic flame retardant by adopting sol-gel technology; finally coating a raised seat fabric with acrylate emulsion, the phosphorus-silicon synergistic flame retardant, a thickener and water and drying and baking the raised seat fabric, thus obtaining the product. The method has the beneficial effects that the flame retardant efficiency and water resistance of the fabric adopting the phosphorus-silicon synergistic flame retardant are improved, the combustion performance meets the requirement of the national B1 level, and meanwhile, the defects of surface efflorescence, soapy handfeel, stickiness, and the like of original phosphorus are improved.

The invention relates to a preparation method of a reactive carbon nanotube flame retardant. Since both the polysiloxane and carbon nanotube belong to flame retardants, after the polysiloxane is grafted onto the carbon nanotube through chemical bonds, a synergistic action is generated between the polysiloxane and carbon nanotube, thereby fully displaying the flame retardancy of the polysiloxane and carbon nanotube. The polysiloxane-grafted carbon nanotube structure has vinyl carried by the polysiloxane, the reactive flame retardant can be grafted to unsaturated polyester, silicone rubber and many other synthetic materials through the vinyl, and the phenyl in the polysiloxane can enhance the carbonization property and flame retardancy of the polymer in the combustion process, thereby enhancing the flame retardancy of the matrix and being beneficial to improving the mechanical, electric and other properties of the material. Both the polysiloxane and carbon nanotube belong to carbonization flame retardants, and the benzene ring in the polysiloxane structure can further enhance the carbonization effect in the combustion process, so that the whole reactive flame-retardant system has higher flame retardancy.

The invention provides spiro-phosphorus phenone polyesteramide intumescent flame retardant and a synthetic method thereof, and relates to a intumescent flame retardant and a synthetic method thereof. The invention solves the problems that the existing intumescent flame retardant has poor thermostability and poor effect of flame retardance, and the synthetic method of the existing intumescent flame retardant has complex process and large energy-consumption. The molecular formula of the intumescent flame retardant of the invention is right type. The synthetic method of the intumescent flame retardant of the invention is as follows: 1,adding spiro hosphorus oxychloride and benzoguanamine into organic solvent, and stirring the solution, heating to fully dissolve the mixture, carrying out heat insulation, stirring and refluxing, and then adding amine catalyst to carry out heat insulation, stirring and refluxing to obtain white turbid liquid; 2, filtering the white turbid liquid, then filtering again and drying to prepare the spiro-phosphorus phenone polyesteramide intumescent flame retardant. The intumescent flame retardant of the invention has good thermostability and good effect of flame retardance, the synthetic method has simple process and less energy-consumption.

The invention relates to a flame-retardant rubber preparation method, wherein the flame-retardant rubber is prepared by mixing the following components by mass fraction: 100 parts of natural rubber, 1.2-1.5 parts of a vulcanizing agent, 0.8-1.0 part of an accelerator CZ, 0.2-0.4 part of an accelerator CZ TMTD, 3.5-4.5 parts of stearic acid, 4.5-5 parts of zinc oxide, 1-2 parts of an an-aging agent 4010, 1-3 parts of liquid paraffin, 30-40 parts of carbon black, 1-5 parts of a flame-retardant synergist, 35-40 parts of ammonium polyphosphate, 10-20 parts of pentaerythrotol, and 10-20 parts of melamine, wherein the flame-retardant synergist is metal organic framework graft functionalized graphene, wherein graphene is functionalized with Benzoic Acid so as to achieve double coordination compounding of the graphene and the metal organic framework. With the flame-retardant rubber of the present invention, the flame-retardant performance of the rubber matrix is significantly improved.

The invention discloses an irradiation cross-linked thermoplastic polyester elastomer cable material. The irradiation cross-linked thermoplastic polyester elastomer cable material comprises, by weight, 100 parts of thermoplastic polyester elastomer (TPEE), 15-40 parts of ethylene-vinyl acetate copolymer (EVA), 50-80 parts of a fire retardant, 0.3-2 parts of a lubricant, 0.3-3 parts of an antioxidant and 0.1-1 part of an ultraviolet light stabilizer. The invention also discloses a method for producing cables through using the cable material. Cable products produced by using the cable material have excellent room temperature and high temperature mechanical performances; irradiation crosslinking realizes good flame retardation performance on the premise of meeting environmental protection, and also realizes cost reduction; and the cable material can reach 125DEG C temperature resistance level, has excellent scratch and wear resistance, and can be widely used in the fields of automobile wires and high and low temperature resistant cables.

The invention relates to a halogen-free flame-retarding polyester thin film and a preparation method of the same. The halogen-free flame-retarding polyester thin film includes, by weight, 100 parts of polyester chips being 0.5-1.8% in phosphorus content, 0.1-15 parts of an additional-type flame retardant, 1-20 parts of a nitrogen-containing expansive-type flame retardant and 0.1-5 parts of an anti-sticking master batch. The method solves the problem that high-phosphorus-content flame-retarding polyester chips are difficult to produce and effectively improves the flame-retarding performance of the polyester thin film. The employed additional-type flame retardant has a good compatibility with the polyester and is not liable to consume and degrade during the preparation process of the thin film, thereby ensuring stable and continuous production of the polyester thin film.

The invention provides a modified lignin based carburizing agent and a preparation method thereof and belongs to the technical field of materials. The carburizing agent has a structure as shown in a formula I; the major raw materials of the carburizing agent are easily available, cheap and reproducible; the carburizing agent is prepared by use of a one-step method, and the preparation process is simple, feasible and low in cost. The modified lignin based carburizing agent is prepared by use of the one-step method; the inflaming retarding element phosphorus is introduced to the lignin molecules so that the carburization capability of the lignin and the compatibility of the lignin with the polymer can be improved; the formula I is as shown in the description, wherein R can be a phenyl or a phenoxyl.

The invention discloses a preparation method of an inorganic hybrid flame retardant with high thermal stability. The preparation method comprises the following steps: a), preparing oxidized graphene suspending liquid; b), adding soluble aluminium salt into the oxidized graphene suspending liquid, controlling the concentration of the soluble aluminium salt to be 50-400 mmol / L, uniformly stirring, adding soluble phosphinate at the temperature of 0-80 DEG C, and stirring, so as to obtain reaction liquid, wherein the molar ratio of the soluble aluminium salt to the soluble phosphinate is 1:(3-4); c), enabling the reaction liquid to be subjected to hydrothermal reaction for 3-12 h at the temperature of 170-190 DEG, and cooling, filtering, washing and drying the obtained product, so as to obtain the inorganic hybrid flame retardant with high thermal stability. In addition, the invention also discloses a PBT composite material comprising the flame retardant. The preparation method for the flame retardant, provided by the invention, is simple, mild in reaction condition, high in productivity and low in price, and facilitates large-scale production and control; an experiment result shows that the PBT composite material, prepared by adding the flame retardant into PBT, has the advantages of being high in limited oxygen index, good in anti-dripping effect, high in char forming property and thermal stability, good in heat insulation performance and the like; the comprehensive flame retardancy of the flame retardant is excellent.

The invention discloses a multi-gradient functionalized microcapsule titanium phosphate flame retardant and a preparation method thereof. The multi-gradient functionalized microcapsule titanium phosphate flame retardant comprises a core material and a wall material for wrapping the core material, wherein the core material is titanium phosphate; the wall material is double-layered, the inner wall is an intumescent flame retardant prepared from a carbon source modifier, an acid source modifier and a gas source modifier in a mole ratio being (1-2):(1-2):(1-2) through reaction, and the outer wall is an organosilicon cross-linked polymer. The preparation method of the flame retardant comprises the following steps: titanium phosphate powder is prepared firstly; then the titanium phosphate powder is dispersed in a solvent, and the carbon source modifier, the acid source modifier and the gas source modifier are added for the reaction for inner wall wrapping; the outer wall is wrapped with the organosilicon cross-linked polymer finally, and the flame retardant is obtained. According to the flame retardant, the organosilicon cross-linked polymer with high carbon formation amount, water resistance, molten droplet avoidance and heat resistance is taken as the outer wall, the intumescent flame retardant is taken as the inner wall, the titanium phosphate powder with carbon formation catalysis characteristic is taken as the core material, so that the prepared microcapsule titanium phosphate flame retardant has more efficient flame retardance and can show a multi-functional multi-gradient flame retardant effect in a burning process.

The invention relates to a reactive flame retardant, specifically a phosphorus-nitrogen-silicon compound containing a triazine ring and a preparation method thereof. In the first step, paraformaldehyde is dissolved in methanol, potassium carbonate solid is added, and the solution is cooled To 0°C, add dimethyl phosphite dropwise while stirring, then warm up to room temperature, filter off potassium carbonate after 1h, and remove methanol from the filtrate under reduced pressure to obtain a colorless oil, which is intermediate Ⅰ. Compared with the prior art, the phosphorus-nitrogen-silicon compound containing triazine rings of the present invention has the following beneficial effects: 1. The phosphorus, nitrogen, and silicon three flame-retardant elements are concentrated in one molecule, which improves the flame retardant Thermal stability, char formation and flame retardant synergistic effect; 2. The synthesis process conditions are stable, the reaction process is easy to control, the production cost is low, and it has good flame retardant effect when the amount of addition is small, and can be used for various fabrics flame retardant treatment.

The invention discloses cyanate ester resin modified by phosphoric hybridization and a preparation method of the cyanate ester resin. The preparation method comprises the steps of: enabling oxidized graphene, a phosphonitrilic chloride trimer and hyperbranched polysiloxane to react so as to obtain phosphoric hybridization oxidized graphene formed under the action of chemical bonds of the oxidized grapheme, the phosphonitrilic chloride trimer and the hyperbranched polysiloxane; and then, uniformly mixing molten cyanate ester resin and the phosphoric hybridization oxidized graphene so as to obtain a mixture, and performing curing process on the mixture so as to obtain the cyanate ester modified by the phosphoric hybridization oxidized graphene. Compared with the cyanate ester resin, on the basis that a prominent dielectric property of conventional cyanate ester resin is basically maintained, under the condition that the phosphorus content is below 0.10wt%, the cyanate ester modified by the phosphoric hybridization oxidized graphene, prepared by the method disclosed by the invention, has excellent thermal properties and fire resistance properties, and solves the problems that according to the thermosetting resin modified by a general phosphoric fire retardant, the initial heat decomposition temperature is reduced, the start igniting time is shortened, and the dielectric property is notably reduced. The preparation method provided by the invention also has the characteristics of simple technology, low cost, wide source of raw materials, and the like.

The invention relates to a cyclic phenyl phosphonate compound and a method for preparing the same, and in particular relates to a cyclic phenyl phosphonate compound having high thermal stability and hydrolysis resistance and a method for preparing the same. The structure of the compound provided by the invention is as shown in the specification, wherein n=0 or 1. The method provided by the invention is to synthesize the compound by a two-step method from trimethylolpropane, trimethyl phosphite and phosphorous acid. The compound is high in phosphorus content, low in toxicity, free of pollution and the like. With a benzene ring and a cyclic structure in the molecular structure, the thermal stability and hydrolysis resistance of the compound are greatly improved; and simultaneously, with the structure of the cyclic phosphonate and high phosphorus content in the molecular structure, the compound shows excellent flame retardant efficiency and can be widely applied to most flame retardant high molecular materials. Furthermore, the compound is rich in synthesis raw material source, simple in production process, and easy for realizing industrial production and application.