45 results about "Phosphoryl chloride" patented technology

The invention belongs to the technical field of epoxy resin flame retardance, and particularly relates to a phosphorus-nitrogen flame-retardant curing agent, preparation thereof and application of the phosphorus-nitrogen flame-retardant curing agent in epoxy resin. In order to prepare the flame-retardant curing agent with both flame retardance and curing, pentaerythritol and phosphorus oxychloride are subjected to a reaction to synthesize an intermediate pentaerythritol diphosphate diphosphoryl chloride; and reacting the intermediate with 4, 4-diaminodiphenylmethane to synthesize the phosphorus-nitrogen flame-retardant curing agent 4, 4-diaminodiphenylmethane pentaerythritol diphosphate. The phosphorus-nitrogen flame-retardant curing agent has good smoke suppression performance, can reduce the combustion rate, is low in cost and environment-friendly, and is mixed with epoxy resin for curing to obtain an epoxy resin composite material with a flame-retardant function, so that the flame-retardant performance of the epoxy resin composite material can be improved, and the fire risk can be reduced.

The invention provides a synthetic method of a novel flame retardant with a phosphaphenanthrene-chloropropyl synergistic structure. The preparation method comprises the following steps: synthesizing bis (1-chloro-2-propyl) phosphoryl chloride from phosphorus oxychloride and epoxypropane in a molar ratio of 1: 2 in a low-temperature condition through a micro-channel reactor, reacting with DOPO-HQ (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl-1, 4-benzenediol), adding a specific solvent and a catalyst, reacting to generate a crude product, filtering, washing, carrying out reduced pressure distillation, and recrystallizing to obtain the 2-(1-chloro-2-propyl) phosphoryl chloride, namely the 2-(1-chloro-2-propyl) phosphoryl chloride-DOPO-HQ (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl-1, 4-benzenediol). The novel flame retardant with the phosphaphenanthrene-chloropropyl synergistic structure is obtained. A phosphaphenanthrene-chloropropyl synergistic structure is designed, so that the molecular weight and the phosphorus content are improved, and the gas-phase flame-retardant and condensed carbon-forming synergistic flame-retardant effect is improved; the thermal stability and the molecular weight are improved through a molecular bridge chain (hydroquinone), and migration is inhibited. The flame retardant has excellent flame retardant property.

Provided is a method for producing an anhydrous cyclic phosphonic acid by reacting phosphonic acid (A) with a basic compound (B) and at least one type of halogenating agent (C) selected from thionyl chloride, phosphoryl chloride, and oxalyl chloride. Also provided is a method for producing a phosphonic acid monoester by reacting the anhydrous cyclic phosphonic acid obtained by said production method with an alcohol.

The present application relates to the technical field of organic synthesis, and particularly relates to a preparation method of beta-nicotinamide mononucleotide. The present application provides a preparation method of beta-nicotinamide mononucleotide, comprising the following steps: mixing a salt corresponding to nicotinamide riboside, phosphorus oxychloride and a polar aprotic organic solvent, performing a phosphorylation reaction, and obtaining beta-nicotinamide mononucleotide. The present application takes nicotinamide riboside as a raw material, takes phosphorus oxychloride as a phosphorylation reagent, and is prepared through a phosphorylation reaction. Compared with a conventional method, the reaction has less by-products and is simple to operate. The subsequent high-purity and high-yield end product can be obtained through simple post-treatment. Meanwhile, the present application is also beneficial to industrial production.

The method for manufacturing an intermediate compound for shikonin synthesis of the present invention comprises the steps of: reacting 1,5-dihydroxynaphthalene with dimethyl sulfate to prepare 1,5-dimethoxynaphthalene; reacting 1,5-dimethoxynaphthalene with N-bromosuccinimide (NBS) to prepare 1,5-dibromo -4,8-dimethoxynaphthalene; introducing a methoxy group into 1,5-dibromo-4,8-dimethoxynaphthalene using copper iodide (CuI) and 1,10-phenanthroline as a catalyst to prepare 1,4,5,8-tetramethoxynaphthalene; performing formylation of 1,4,5,8-tetramethoxynaphthalene using phosphoryl chloride (POCl3) to prepare 2-formyl-1,4,5,8-tetramethoxynaphthalene; and forming a boron complex using pinacolborane (HBpin) and 3,3-dimethylallyl bromide and reacting the boron complex with 2-formyl -1,4,5,8-tetramethoxynaphthalene to prepare a prenylated shikonin intermediate. Compared to conventional synthetic methods, the method of the present invention offers milder reaction conditions, shorter reaction time, and improved yield, thereby greatly enhancing the economic feasibility of shikonin synthesis.

The present application relates to a kind of transparent flame-retardant coating compound and its preparation method and application, the structural formula of the compound is as shown below: preparation method includes with diphenyl phosphor chloride (DPPC), tetraethylenepentamine (TEPA), ladder epoxy polysiloxane (AEOS) as raw material, by two-step method polymerization is obtained.The transparent flame-retardant coating compound of the present application is used for polycarbonate coating, with the characteristics of strong adhesion, high surface hardness, excellent transparency and flame-retardant performance, has good market application prospect.

The invention discloses a synthesis process of chiral UNA phosphoramidite, phosphoryl chloride and phosphoramidite and application of the chiral UNA phosphoramidite, phosphoryl chloride and phosphoramidite in oligonucleotides, and particularly designs preparation and synthesis of (2S)-UNA monomer phosphoramidite, phosphoryl chloride and phosphoramidite. And the method can also be used for solid-phase synthesized oligonucleotides in the conventional 3-to-5 direction, and the influence of introduction of monomers with different chirality to design sites on the structure, the biological activity and the like is researched.

The invention provides a preparation method of chlorpyrifos, and relates to the field of chemical synthesis, and the preparation method comprises the following steps: adding 3, 5, 6-trichloropyridine-2-sodium alkoxide, a composite catalyst and distilled water into a reactor; after uniformly stirring, adding 0, 0-diethyl thiophosphoryl chloride to obtain a reaction solution, and adding ammonia water; raising the temperature to 45-55 DEG C, after the reaction is finished, transferring the reaction liquid to a suction filtration device for suction filtration, and separating out a filter cake containing a chlorpyrifos crude product and a mother solution; and washing the filter cake with water, and drying to obtain a chlorpyrifos active compound finished product. According to the preparation method disclosed by the invention, 0, 0-diethyl thiophosphoryl chloride and ammonia water are added at one time, so that the exposure risk of toxic substances is reduced; water is used as a solvent, ammonia water is used as an acid-binding agent, and the problems of organic solvent pollution and strong alkaline wastewater treatment are solved; by controlling the alkalescence environment and reaction conditions, side reaction is inhibited, and the yield and purity of the product both reach 99% or above.

The invention provides a rigid photocurable flame-retardant compound as well as a preparation method and application thereof. The rigid photocurable flame-retardant compound is synthesized by taking pentaerythritol, phosphorus oxychloride and hydroxyethyl acrylate as raw materials through two steps of nucleophilic substitution reaction: firstly, enabling the pentaerythritol to react with the phosphorus oxychloride, and then enabling a phosphoryl chloride intermediate to further react with the hydroxyethyl acrylate. The method is simple in process and environment-friendly. The obtained light-cured resin monomer has a rigid spiro structure, a phosphate group and a polymerizable double bond, and has a rapid light-curing characteristic and an excellent flame retardant property. The cured material is high in hardness, excellent in flame retardant property, high in thermal stability, excellent in mechanical property and wide in application prospect. The monomer not only can be independently used as flame-retardant light-cured resin, but also can be applied to various flame-retardant light-cured formulas as a reactive flame retardant.

The invention discloses a flame-retardant high-temperature-resistant vehicle body film and a preparation method thereof, and relates to the technical field of high polymer materials. When the flame-retardant and high-temperature-resistant automobile body film is prepared, after 8 (aminophenyl trioxosilane) is diazotized, the diazotized 8 (aminophenyl trioxosilane) reacts with dimethyl phenyl silane to prepare azobenzene POSS; the preparation method comprises the following steps: reacting cellulose acetate with N2, N4, N6-tris (2-aminoethyl)-1, 3, 5-triazine-2, 4, 6-triamine and divinyl phosphoryl chloride in sequence to prepare modified cellulose acetate; the preparation method comprises the following steps: carrying out reaction on polyurethane, pyridine-2, 6-dicarboxylic acid and europium chloride hexahydrate to prepare modified polyurethane; and uniformly mixing the modified polyurethane, the modified cellulose acetate and azobenzene POSS, and carrying out mold pressing to form a film, so as to prepare the flame-retardant high-temperature-resistant vehicle body film. The flame-retardant and high-temperature-resistant vehicle body film prepared by the invention has excellent ultraviolet resistance, flame retardance and high-temperature resistance.

This invention relates to the field of flame retardant preparation technology, and more particularly to a method for preparing an environmentally friendly and highly efficient flame-retardant polyolefin cable sheath material. The invention uses compounds containing primary amino and amide bonds and compounds containing phenyl and phosphoryl chloride groups as raw materials. The reaction is carried out at room temperature for 0.5-1 h, then heated to 45 °C for 3-4 h, and then to 65 °C for 5-6 h. Through a condensation reaction, a phosphoramide macromolecular flame retardant containing phenyl and amide bonds is obtained, with a yield as high as 80.5-95.6%. This flame retardant is added to polyolefin cable sheath material at a mass ratio of 25%, then compounded and extruded to obtain a halogen-free flame-retardant polyolefin cable sheath material. The flame retardant molecule prepared by this invention simultaneously contains phosphorus and nitrogen flame-retardant elements and amide bonds forming a char skeleton. During combustion, it can exert a phosphorus-nitrogen synergistic flame-retardant effect and promote the catalytic char formation of the matrix, which can significantly reduce the heat and toxic gas release of polyolefin cable sheath material during combustion, thereby providing protection for the lives of people in fire scenes.

The invention provides a phenyl phosphonic acid bis (o-isocyano-phenol) ester ligand which is prepared by the following steps: in an inert gas atmosphere, mixing a compound benzoxazole with anhydrous tetrahydrofuran, cooling to-95 to-65 DEG C, adding an n-butyllithium solution dissolved in an organic solvent, stirring at-95 to-65 DEG C for 0.5-4 hours, adding diphenylphosphoryl chloride, stirring at room temperature for 8-10 hours, filtering, washing, and drying to obtain the phenyl phosphonic acid bis (o-isocyano-phenol) ester ligand. Carrying out post-treatment on the obtained reaction liquid to obtain a phenyl phosphonic acid bis (o-isocyano phenol) ester ligand; compared with the most common organic dye photosensitizer, the copper-based photosensitizer prepared from the phenyl phosphonic acid bis (o-isocyano-phenol) ester ligand overcomes the defect that the catalytic activity of the organic dye photosensitizer is rapidly reduced under long-term illumination, and in addition, the organic dye photosensitizer is easy to generate an aggregation-induced quenching effect; the photosensitizer disclosed by the invention does not generate an aggregation-induced quenching effect; compared with an iridium complex photosensitizer which is commonly used at present, the cuprous photosensitizer provided by the invention is more environment-friendly.

The invention relates to the technical field of bisphenol A bis (diphenyl phosphate) synthesis, in particular to a synthesis method of BDP with low TPP content, which at least comprises the following steps: taking a phosphoryl chloride reaction solution as a raw material, controlling the dropwise adding temperature and the dropwise adding time, dropwise adding phenol into a container containing the phosphoryl chloride reaction solution, and extracting negative pressure in the dropwise adding process; the method comprises the following steps: dropwise adding TPP, heating after dropwise adding, controlling the degassing pressure and preserving heat to obtain a BDP crude product, and refining the BDP crude product to obtain a BDP product, thereby effectively reducing the TPP content, improving the BDP product quality and better meeting the actual production requirements by optimizing the reaction conditions.

The invention discloses an anti-UV epoxy resin material for a copper-clad plate and a preparation method of the anti-UV epoxy resin material, and relates to the technical field of copper-clad plate materials. The prepared anti-UV epoxy resin material for the copper-clad plate is prepared by adding polyester benzotriazole and a polyacrylate derivative into bisphenol A epoxy resin, the polyester benzotriazole is prepared by reacting benzotriazole with phenylacetyl chloride polyester, and the phenylacetyl chloride polyester is prepared by reacting terephthalic acid, N-acetyl-4-(2-aminoethyl) phenylacetic acid and ethylene glycol, and then adding the polyacrylate derivative into the bisphenol A epoxy resin to obtain the anti-UV epoxy resin material for the copper-clad plate. The material is prepared by acylating chlorination, so that the material can still maintain stability under long-term ultraviolet exposure; the polyacrylate derivative is prepared by polymerizing hydroxyethyl acrylate with a phosphorus source, a nitrogen source and a silicon source, the phosphorus source is pentaerythritol diphosphate diphosphoryl chloride, the silicon source is prepared by reacting epoxy methyl diphenyl silane with melamine, the nitrogen source is diurea dihydric alcohol, and then the polyacrylate derivative is combined with the modified epoxy resin, so that the modified epoxy resin is obtained. Therefore, the material keeps good dielectric property and mechanical property.

The application belongs to the technical field of fluorine chemical synthesis, and particularly relates to a preparation method of tetra (fluorophosphoryl) imide alkali metal salt, at least comprising the following steps: mixing phosphoryl chloride, alkyl primary amine and acid binding agent in an organic solvent, stirring and reacting, and filtering to remove byproducts; adding a fluorination reagent, stirring and reacting, and filtering to remove byproducts; adding alkyl secondary amine, stirring and reacting, washing with deionized water, and removing the organic solvent under reduced pressure; adding a polar solvent and an alkali metal compound, stirring and reacting, filtering, concentrating, adding a weakly polar organic solvent to perform recrystallization, and drying under reduced pressure to obtain a finished product. Compared with the prior art, the raw materials used in the application are easy to obtain and low in cost, the production process is simple, no dangerous unit operation of high temperature and high pressure is involved, the product is easy to separate and purify, three-waste emissions are small, the application is friendly to the environment, the operation steps are simple, the product is easy to separate and purify, the purity and yield are high, the application is suitable for industrial mass production, and the like.

The application discloses a kind of preparation methods of flame-retardant aging-resistant high-transparency polyurethane, the polyurethane is first with 2-amino-1,3-propanediol, 2-chloro-4,6-diphenyl-1,3,5-triazine, diphenyl phosphorochloridate and triphenylchlorosilane composite preparation DADT, then DADT is mixed with polyether polyol, isocyanate to obtain;The preparation method of the application is simple, the process is easy to control, the obtained polyurethane material limit oxygen index reaches 29.6%, meets commercial flame-retardant standard and reaches UL-94 V-0 flame-retardant grade;Material has excellent aging resistance, heat-oxygen tensile strength retention rate is 88.5%, heat-oxygen breaking elongation retention rate is 77.4%, and ultraviolet breaking elongation retention rate is 71.4%, can be applied to automobile ultraviolet protection diaphragm, flame-retardant filled foam, fire guide sign protection film and the like scene.

This invention provides a method for producing 2-chloro-5,6-diphenylpyrazine in high yield. [Solution] In one aspect, a method for producing 2-chloro-5,6-diphenylpyrazine is provided. This method includes contacting 2-hydroxy-5,6-diphenylpyrazine and phosphoryl chloride at a temperature of 70°C or higher and less than 120°C to obtain a first mixture. The first mixture contains 2-chloro-5,6-diphenylpyrazine. The contact temperature is preferably 80°C or higher and 100°C or lower.

The invention provides a halogen-free phosphorus flame retardant as well as a preparation method and application thereof, and belongs to the technical field of flame retardants. The preparation method comprises the following steps: mixing a hydroxyl-containing compound, an acid-binding agent and an organic solvent to obtain a mixed solution; dropwise adding pyrophosphoryl chloride into the mixed solution, and reacting to obtain a reaction product; and carrying out post-treatment on the reaction product to obtain the halogen-free phosphorus flame retardant. The hydroxyl-containing compound comprises one or more of epoxy butanol, glycidol, syringaldehyde, vanillin and p-hydroxybenzaldehyde. The halogen-free phosphorus-based flame retardant disclosed by the invention is a flame retardant with a new structure and has an epoxy group capable of participating in a co-curing reaction of epoxy resin; the preparation method of the flame retardant is simple, the flame retardant is prepared from hydroxyl-containing compounds such as glycidol and pyrophosphoryl chloride under the action of an organic solvent and an acid-binding agent through a one-step synthesis method, and a target object can be conveniently and rapidly prepared.

The present application relates to fine chemical technology field, especially to a kind of anti-micro pitting additive and its preparation and application.The present application uses starch masking method, uses hydroxylated boron nitride and O, O-dialkyl thiophosphoryl chloride to carry out chemical reaction to prepare this anti-micro pitting additive, and the core skeleton is hexagonal boron nitride nanosheet, one side contains hydroxyl functional group, the other side is covalently connected O, O-dialkyl thiophosphate, and the process condition used is mild;The anti-micro pitting additive prepared by the present application can be used as multifunctional lubricant additive, utilizes the filling and interlayer slip of boron nitride nanosheet, the chemical adsorption of hydroxyl surface and friction pair, the tribological chemical reaction of O, O-dialkyl thiophosphate and friction pair synergistic effect, obtains good extreme pressure, antiwear, anti-micro pitting and anticorrosion etc., suitable for long-acting stable friction and micro pitting lubrication protection under harsh working conditions.

The invention relates to the technical field of polyurethane, and discloses a water-based polyurethane fireproof coating and a preparation method thereof, pentaerythritol diphosphate diphosphoryl chloride, 4-methoxy-L-phenylalanine, pyridine hydrochloride and the like are used as reactants to prepare a novel carboxyl-containing water-based flame-retardant chain extender, and the water-based flame-retardant chain extender is used as a fire retardant. And carrying out polymerization reaction with dihydric alcohol and diisocyanate monomer to obtain the waterborne polyurethane fireproof coating. The polyurethane water-based emulsion is good in dispersity, high in emulsion stability and excellent in hardness; meanwhile, a nitrogen-phosphorus flame-retardant structure of the bis-spirophosphamide is grafted into a polyurethane molecular chain, so that the combustion limit oxygen index of the polyurethane film material is remarkably improved and reaches 27.9-29.6%, and the UL-94 grade reaches V-0.

The invention provides a lignin-based reactive flame retardant, a preparation method and application of the lignin-based reactive flame retardant in flame-retardant styrene resin, and belongs to the technical field of flame-retardant polystyrene. The preparation method comprises the following steps: firstly, by taking renewable resources as raw materials, quantitatively converting a lignin phenolic compound into a lignin vinyl phenol monomer through decarboxylation, then carrying out phosphorylation reaction on the lignin vinyl phenol monomer and a phosphoryl chloride monomer to synthesize a lignin-based reactive flame retardant containing a vinyl benzene structure, and applying the lignin-based reactive flame retardant to preparation of lignin-based intrinsic flame-retardant styrene resin. The flame retardant has excellent biocompatibility, stable flame-retardant effect and environmental friendliness, the flame-retardant mechanism of the flame retardant is derived from phosphate groups introduced into molecules, and the dual flame-retardant mechanism is realized in a condensed phase and a gas phase; the flame retardant has modular characteristics, can be used for flexible design and structural regulation of flame-retardant molecules, and has reliable application value in the field of flame-retardant modified styrene materials; the problem of base performance degradation caused by a traditional flame retardant can be effectively avoided under the condition that the basic performance of the material is kept.

The application relates to a high-flame-retardant electronic connecting wire and a preparation method thereof, and belongs to the technical field of high polymer materials. The electronic connecting wire is composed of a wire and a surface flame-retardant protective layer, wherein the components of the flame-retardant protective layer are as follows: modified phosphorus-silicon flame retardant 7.5-10 wt%, plasticizer 14-18 wt%, heat stabilizer 1.7-2.2 wt%, antioxidant 0.12-0.16 wt% and lubricant 0.9-1.3 wt%, and the rest is PVC resin; the modified phosphorus-silicon flame retardant is synthesized by synthesizing a phosphorus oxychloride intermediate 1 with a double spiro ring structure from pentaerythritol and phosphorus oxychloride, carrying out amine-ester exchange between terminal amino polydimethylsiloxane and ketone-based diethyl malonate to prepare an intermediate 2 containing terminal amino groups, and then reacting the intermediate 2 with active phosphorus oxychloride of the intermediate 1 to form a chain-shaped macromolecular phosphorus amide compound, so that in-situ toughening, migration inhibition and carbon net flame retardation are simultaneously realized in the PVC matrix.

A method for preparing and using an organic matter extractant in wastewater, comprising: 1) reacting hypoxanthine I with phosphorus oxychloride to obtain a chloro product II, then condensing the chloro product II with 5-(2-acetyloxyethyl)tetrahydrofuran-2,3,4-triyl triacetate to obtain compound III, and then subjecting the compound III to ammonolysis to obtain compound IV; 2) adding glycerol distearate and phosphorus oxychloride to a mixed solution of tetrahydrofuran and triethylamine to react to generate a phosphoryl chloride intermediate V; 3) hydrolyzing and acidifying the compound IV and the intermediate V in a mixed solution of tetrahydrofuran and triethylamine to obtain an extractant adenosine phosphate glycerol distearate VI; and 4) mechanically mixing the extractant adenosine phosphate glycerol distearate VI and aviation kerosene to obtain an organic matter extractant product in wastewater. The organic matter extractant in wastewater of the present application mainly uses adenosine phosphate ester compounds and related derivatives as a main extractant, extracts and separates various organic matters in wastewater, has a high removal rate of organic matters, and has a high recovery rate of the extractant.

The invention belongs to the field of analytical chemistry, and particularly discloses a method for detecting chiral purity of carnitine. The detection method provided by the invention comprises the following steps: respectively reacting a carnitine sample and a DL carnitine standard substance with a novel chiral derivatization reagent (S)-(-)-1, 2, 4-triazole; the method comprises the following steps: carrying out a derivatization reaction on (R)-(-)-1, 1 '-binaphthalene-2, 2'-dibasic phosphoryl chloride or (R)-(-)-1, 1 '-binaphthalene-2, 2'-dibasic phosphoryl chloride in an organic solvent to generate a diastereomer, separating and detecting derivatization products through reversed-phase high performance liquid chromatography, determining the retention time of the carnitine derivative according to the retention time of the DL carnitine derivative, and determining the content of the DL carnitine derivative according to the retention time of the DL carnitine derivative. And calculating the chiral purity through an area normalization method. Compared with the traditional method, the method provided by the invention has the advantages that the cost is reduced by more than 50%, the analysis accuracy is equivalent, the sensitivity is high, the chiral purity of carnitine can be accurately measured, and the market demand on an efficient and economic detection method is met.

The invention discloses a preparation method of flame-retardant anti-aging high-transparency polyurethane, which comprises the following steps: firstly, compounding 2-amino-1, 3-propylene glycol, 2-chloro-4, 6-diphenyl-1, 3, 5-triazine, diphenyl hypophosphorous chloride and triphenylchlorosilane to prepare DADT (diphenyldisiloxane), and then mixing the DADT with polyether polyol and isocyanate to prepare the flame-retardant anti-aging high-transparency polyurethane. The preparation method is simple, the process is easy to control, the limit oxygen index of the obtained polyurethane material reaches 29.6%, the commercial flame retardant standard is met, and the UL-94 V-0 flame retardant grade is reached; the material has excellent aging resistance, the thermo-oxidative tensile strength retention rate is 88.5%, the thermo-oxidative elongation at break retention rate is 77.4%, the anti-ultraviolet elongation at break retention rate is 71.4%, and the material can be applied to scenes such as automobile anti-ultraviolet diaphragms, flame-retardant filling foam and fire-fighting guide sign protective films.

The invention belongs to the technical field of flame retardants, and particularly relates to a preparation method of a high-strength water-resistant halogen-free flame retardant, the prepared halogen-free flame retardant and application of the high-strength water-resistant halogen-free flame retardant. Phosphorus oxychloride and hydroquinone react to introduce phosphorus into reactants to obtain hydroquinone phosphoryl chloride; the preparation method comprises the following steps: reacting 2, 6, 7-trioxa-1-phosphoric acid bicyclo [2.2. 2] octane-4-yl methanol with a hydroxyl group of pentaerythritol, and introducing a bicyclic cage into a reactant by reacting halogen of phosphorus oxychloride with the hydroxyl group of pentaerythritol to obtain 2, 6, 7-trioxa-1-phosphoric acid bicyclo [2.2. 2] octane-4-yl methanol; finally, the halogen group of hydroquinone phosphoryl chloride and the hydroxyl group of 2, 6, 7-trioxa-1-phosphoric acid bicyclo [2.2. 2] octane-4-yl methanol are subjected to nucleophilic substitution, and redundant halogen and the amino group of 4, 4 '-diaminodiphenylmethane and 1, 6-hexamethylenediamine are subjected to an amination reaction to generate the high-strength water-resistant halogen-free flame retardant with a cross-linked structure, so that the stability and consistency of the material are improved, and the flame retardant property is improved. The flame retardant shows excellent mechanical strength, so that the flame retardant has longer service life in a severe environment.

This invention relates to the field of polyurethane technology and discloses a waterborne polyurethane fire-retardant coating and its preparation method. A novel carboxyl-containing waterborne flame-retardant chain extender is prepared using pentaerythritol diphosphate bisphosphonate chloride, 4-methoxy-L-phenylalanine, and pyridine hydrochloride as reactants. This chain extender is then polymerized with diol and diisocyanate monomers to obtain the waterborne polyurethane fire-retardant coating. The waterborne polyurethane emulsion exhibits good dispersibility, high emulsion stability, and excellent hardness. Furthermore, the nitrogen-phosphorus flame-retardant structure of bisspirocyclic phosphoramide is grafted into the polyurethane molecular chain, significantly improving the limiting oxygen index of the polyurethane film material to 27.9-29.6%, achieving a UL-94 rating of V-0.

The invention discloses a novel alkaline hydrogen bond-assisted chiral bicyclic guanidine ion pair catalyst and its preparation and application, the present invention carries out certain structural transformation to traditional PN ion pair catalyst, without destroying the original structural basis, adds the structure of hydrogen bond, makes this novel H PN in various asymmetric catalytic reactions can play the dual role of hydrogen bond and ion pair catalysis, successfully constructs chiral phosphoramide compounds with higher yield (70% 80%) and enantioselectivity (80% 90%), solves the problem that traditional ion pair catalyst is difficult to construct chiral phosphoramide compounds. With phosphoryl chloride or secondary phosphorus oxide as substrate, various primary amine secondary amines as nucleophilic reagent, using 4% 10% catalyst of the present invention, successfully obtains phosphoramide with high yield (60% 80%) and high enantioselectivity (70% 90%).

This invention provides a method for preparing melamine pyrophosphate and its application, belonging to the field of flame retardant technology. The invention uses pyrophosphoryl chloride and melamine as raw materials, reacting them in an alcohol-water mixed solvent. After the reaction, the mixture is neutralized with alkali, and post-processed to obtain melamine pyrophosphate. This invention uses pyrophosphoryl chloride as the phosphorus source, solving the problems of insufficient reaction due to the high viscosity of raw materials in the traditional pyrophosphate method and the hygroscopic and difficult-to-store raw materials in the phosphorus pentoxide method. The reaction process does not require strong acid catalysis; the byproduct hydrogen chloride is converted to ammonium chloride after neutralization with ammonia water, avoiding the generation of high-salt wastewater, making the process environmentally friendly. The method of this invention features mild reaction conditions, simple operation, high product purity, and good thermal stability. The obtained melamine pyrophosphate has a purity ≥95% and a 5% thermal decomposition temperature ≥300℃, making it suitable as a halogen-free flame retardant for widespread application in epoxy resins, polyolefins, nylon, coatings, rubber, and other fields.

The invention belongs to the technical field of polyurethane hot melt adhesives, and particularly relates to a two-component reactive polyurethane hot melt adhesive and a preparation method thereof. The two-component reactive polyurethane hot melt adhesive comprises a component A and a component B, the component A is prepared from an isocyanate group terminated polyurethane prepolymer; the isocyanate-terminated polyurethane prepolymer is prepared from polyether polyol, polyester polyol, hydroxyl-terminated silicone oil and diisocyanate through a reaction; the component B comprises a functional polyhydroxy compound, a chain extender, a cross-linking agent, a catalyst and an auxiliary agent; wherein the functional polyhydroxy compound is prepared by the following steps: S1, enabling pentaerythritol to react with phosphorus oxychloride, so as to prepare pentaerythritol diphosphate diphosphoryl chloride; and S2, enabling the pentaerythritol diphosphate diphosphoryl chloride to react with 4, 4 '-p-hydroxybiphenol, so as to prepare the functional polyhydroxy compound. The prepared polyurethane hot melt adhesive has good flame retardant property and heat-conducting property, and can be applied to the field of automobiles.