32 results about "Triphenyl phosphite" patented technology

The invention relates to the technical field of wastewater treatment, in particular to a multi-stage circulating filtration system and method based on triphenyl phosphate production wastewater, and the system comprises a first-stage filtration system, a second-stage filtration system, a third-stage filtration system, a front-end wastewater collection tank and a flow pump, the front ends of the first-stage filtration system, the second-stage filtration system and the third-stage filtration system are connected with a three-way pipe through the flow pump, and the three-way pipe is mounted at the lower end of an anti-precipitation unit; the upper end of the anti-precipitation unit is fixedly connected with a front-end wastewater collection tank, an air source assembly is mounted on the inner side of the upper end of the front-end wastewater collection tank, and a telescopic air pipe is mounted at the lower end of the air source assembly; the anti-precipitation unit comprises a stirring box, one end of the stirring box is fixedly connected with a side end liquid discharging pipe through screws, a liquid discharging hole is formed in the middle of the bottom end of the stirring box, a stirring assembly is installed in the stirring box, and stirring blades are installed on the outer side of the stirring assembly. According to the invention, the air source assembly is driven by the liquid level change of the collecting box, the air pressure is used as power, the operation of the stirrer and the action of the cleaning scraper are automatically controlled in a linkage manner, stirring as required is realized, and energy is remarkably saved.

A method for converting post-consumer recycled (PCR) flakes of polyethylene terephthalate (PET) to pellets as part of a container recycling procedure, the method including: adding triphenyl phosphite antioxidant to a reactor at a concentration of 0.05 wt.% to 0.15 wt.%; coating the PCR flakes with the triphenyl phosphite in the reactor; and converting the PCR flakes to the pellets in an extruder after coating the PCR flakes with the triphenyl phosphite to reduce yellowing of the pellets during the conversion.

The present application belongs to the technical field of cable material, and particularly relates to a resin composition, a cable insulation material, a cable and a preparation method. The resin composition comprises polyethylene, a crosslinking agent and a crosslinking aid. The crosslinking agent is selected from one or more of triallyl isocyanurate, trimethylolpropane trimethacrylate and trimethylolpropane triacrylate. The crosslinking aid is selected from one or more of triphenyl phosphite, dipropylene glycol diacrylate and tetraethylene glycol diacrylate. The cable insulation material made of the resin composition has a high irradiation crosslinking rate, which can significantly improve the irradiation processing speed of the subsequent cable and improve the cable output efficiency. In addition, the cable insulation material has good aging resistance, can meet the long service life requirement, saves the cable update cost and has good economic benefits.

The application relates to a water-erosion-resistant compressor impeller, and relates to the technical field of impeller materials, which comprises an impeller base body, a high-entropy alloy layer and a super-hydrophobic layer, the super-hydrophobic layer is obtained by coating super-hydrophobic paint on the surface of the high-entropy alloy layer, and the preparation raw materials of the super-hydrophobic paint comprise the following components in mass fraction: 10-20 parts of fluorosilicon resin, 5-10 parts of modified alumina crosslinking agent, 40-60 parts of modified hyperbranched polyester, 1-2 parts of triphenyl phosphite, 0.4-0.6 parts of titanium catalyst and 40-50 parts of solvent. The application has the effect of improving the hardness and water-erosion resistance of the impeller, the impeller can resist the impact damage of water during the working process, and can maintain good working performance for a long time.

The invention provides a lithium ion battery, which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode current collector and a positive electrode active material layer arranged on at least one side surface of the positive electrode current collector, the positive electrode active material layer comprises a positive electrode active material, the positive electrode active material contains a doping element, and the doping element is a non-aqueous electrolyte. The doping element comprises one or more of Mg, Zn and Cr; the non-aqueous electrolyte comprises an additive, the additive comprises a compound as shown in a structural formula 1 and a water removal acid additive, and the water removal acid additive comprises triphenyl phosphate; in the structural formula 1, n is 0 or 1, A is selected from C or O, X is selected from H, R1 and R2 are independently selected from H, or R1 and R2 are not selected from H at the same time, and X, R1 and R2 at least contain one sulfur atom; the lithium ion battery satisfies 15 < = < = 5000; 0.01 < = a < = 0.8, 20 < = b < = 1000, 20 < = c < = 200, and 0.4 < = d < = 1.8; the present application provides a lithium ion battery that achieves both low impedance growth and long cycle life.

The invention relates to the technical field of organic alcohol synthesis, and discloses a method for synthesizing isononyl alcohol. The method comprises the following steps: (1) mixing octylene, a rhodium catalyst and a phosphine ligand, then introducing synthesis gas into the obtained mixture, and carrying out hydroformylation reaction to obtain isononanal; (2) in the presence of a hydrogenation catalyst, mixing the isononanal with hydrogen for hydrogenation reaction; wherein the phosphine ligand is selected from two or more of triphenyl phosphite, tris (2, 4-di-tert-butylphenyl) phenyl phosphite, triphenylphosphine, 6, 6 '-{[5, 5'-dimethoxy-3, 3 '-bis (2-methyl-2-propyl)-2, 2'-biphenyl diyl] bis (oxy)} bis [dibenzo (d, f) (1, 3, 2) dioxaphosphoheptane] and 4, 5-bis (diphenylphosphine)-9, 9-dimethyl xanthene. According to the method, the conversion rate of mixed octylene in the hydroformylation process and the selectivity and yield of isononyl aldehyde can be remarkably improved, so that the yield of isononyl alcohol is improved, reaction conditions are mild, and the method has remarkable economic value and wide industrial application prospects.

The invention discloses a structural adhesive material for tunnel secondary lining crack repair and a preparation method thereof, and relates to the technical field of tunnel engineering repair materials, the structural adhesive material comprises the following components by weight: 60-80 parts of epoxy resin, 20-30 parts of 2, 4-diamino-6-diallylamino-1, 3, 4-trimethyl-1, 3, 4-trimethyl-1, 3, 4-trimethyl-1, 3, 4-trimethyl-1, 3, 4-trimethyl-1, 3, 4-trimethyl-1, 3, 4 The invention relates to a light-emitting diode (LED) fluorescent powder which is prepared from the following components in parts by weight: 5 to 8 parts of 1, 3, 5-triazine, 3 to 5 parts of meso-tetramethyl-meso-tetra-p-aminophenyl calix [4] pyrrole, 1 to 3 parts of triphenyl isocyanate thiophosphate, 3 to 5 parts of 2, 4, 6-trivinyl boroxane, 6 to 13 parts of reinforcing filler, 1 to 3 parts of coupling agent, 0.5 to 1 part of accelerant, 1 to 3 parts of penetrant, 0.1 to 0.3 part of photoinitiator and 0.3 to 0.6 part of catalyst. The structural adhesive material for repairing the tunnel secondary lining crack disclosed by the invention can quickly repair and permeate the crack, does not fall off under the action of long-term wind load, and has a good bonding effect.

This invention provides a circular polarizing eye-protecting AB adhesive, relating to the field of adhesive production technology. This circular polarizing eye-protecting AB adhesive is prepared by mixing and stirring component A and component B. Component A consists of the following raw materials: epoxy resin composite; modified epoxy acrylate prepolymer; cholesteric liquid crystal-epoxy hybrid microspheres; fluorescent dye; anti-aging agent; and acid-free optical grade additives. Component B consists of the following raw materials: amine curing agent; dihedral naphthalenedicarboximide derivative containing amine groups; aminosilane coupling agent; polyetheramine accelerator; and triphenyl phosphite anti-yellowing agent. This invention can be widely applied to the protection and optical optimization of various screens such as smartphones, tablets, automotive displays, and wearable devices, and has significant practical value and industrialization prospects.

The invention relates to the technical field of heat stabilizers, and particularly discloses a citric acid compound heat stabilizer and a preparation method and application thereof. The citric acid compound heat stabilizer comprises zinc citrate, and further comprises one or more of calcium stearate, epoxidized soybean oil, stearoylbenzoylmethane and triphenyl phosphate. The citric acid compound heat stabilizer disclosed by the invention is applied to preparation of a polyvinyl chloride material, and has the advantages of excellent heat stabilization effect and environmental friendliness.

The application provides a synthesis method of high-hygroscopic-dispersing-dye easy-to-dye functional polyester, which comprises the following steps: step one, esterification one-pot; step two, esterification two-pot; step three, final polymerization pot (polycondensation); and step four, discharging and slicing. The polyester is prepared by a continuous polymerization or an intermittent polymerization mode, p-terephthalic acid, ethylene glycol and ethylene glycol antimony are added in the esterification one-pot, polyethylene glycol, nano montmorillonite, cobalt acetate, stabilizer Irganox1010 and triphenyl phosphite are added in the esterification two-pot; the low-temperature coloring and the hygroscopic property of the polyester are realized by adding the polyethylene glycol, the easy-to-dye and the hygroscopic property of the polyester are realized by adding the nano montmorillonite, the ethylene glycol antimony is added as a catalyst, the polymerization reaction and the stability of the polyester are realized by adding the cobalt acetate, the stabilizer Irganox1010 and the triphenyl phosphite, and finally the easy-to-dye and the hygroscopic effect of the polyester are realized.

This invention belongs to the field of polymer organic chemistry technology and discloses a high-temperature resistant copolymer flame retardant for nylon resin and its preparation method. Under nitrogen protection, the flame retardant is prepared in a two-step process using triphenyl phosphite, cyanuric chloride, and terephthalic acid or 1,6-naphthalenedicarboxylic acid as raw materials. The resulting flame retardant is a halogen-free, environmentally friendly, and high-temperature resistant intrinsic flame retardant. This flame retardant requires a small dosage, and the resulting nylon resin maintains high flame retardant performance without affecting its mechanical properties.

The invention belongs to the technical field of new energy batteries, and particularly relates to a lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a diaphragm and a non-aqueous electrolyte, the anode and the cathode respectively comprise an anode current collector and a cathode current collector; the positive current collector is an aluminum foil or a composite current collector, the negative current collector is a copper foil or a composite current collector, and at least one of the positive current collector and the negative current collector is a composite current collector; the non-aqueous electrolyte contains triphenyl phosphate and a first additive, and the first additive comprises at least one of tris (trimethylsilane) phosphate, tris (trimethylsilane) borate or tris (trimethylsilane) phosphite; when the positive current collector is a composite current collector and / or the negative current collector is a composite current collector, the lithium ion battery meets the following conditions: (a + c) * b * d is more than or equal to 1 and less than or equal to 500; 0.5 < = a < = 2, 20 < = b < = 800, 0.5 < = c < = 2, and 0.01 < = d < = 1. The lithium ion battery has the advantages of high energy density, low impedance increase and excellent cycle performance.

The invention provides a graphene-modified fireproof anticorrosive coating which comprises a component A and a component B. The component A comprises 35%-38% by weight of first bio-based polyol, 25%-28% by weight of isocyanate, 0.2%-0.5% by weight of triphenyl phosphate and 33.5%-37% by weight of an environment-friendly solvent. The component B comprises the following components in percentage by weight: 42%-44% of second bio-based polyol, 10%-12% of a difunctional flame retardant, 32%-34% of a carbon source flame retardant, 3%-5% of graphene dispersion slurry, 10%-12% of filler and 1%-2% of a grinding aid. Related preparation methods are also provided. The graphene-modified fireproof anticorrosive paint has efficient fireproof and anticorrosive dual core properties, and is excellent in physical and chemical comprehensive performance, good in environmental compatibility, simple in preparation process route, simple and convenient to prepare, easy to operate and low in preparation cost.

The invention relates to the technical field of functional polymer materials, in particular to conductive hydrogel and a preparation method thereof.Polyvinyl alcohol-sodium carboxymethyl cellulose serves as a composite polymer matrix, silver elementary substance particles and MXene are matched to construct a point-sheet synergistic conductive network, and the conductive hydrogel is prepared; the interface compatibility is optimized by virtue of a triphenyl phosphite, sodium tetraborate and sodium silicate composite modifier, and the conductivity and mechanical properties are synergistically improved in combination with a multi-stage composite filler consisting of epoxy modified nano silicon dioxide / silver particles, modified MXene and modified montmorillonite; meanwhile, through an integrated process of low-temperature 3D printing precise forming, freezing-unfreezing circulation cross-linking strengthening structure and segmented vacuum drying for regulating and controlling moisture stability, the problem that the conductivity and the mechanical property of traditional conductive hydrogel are difficult to consider at the same time is solved; the method is suitable for the fields of flexible sensors, electronic skin, biomedical signal acquisition electrodes, wearable flexible electronic equipment and the like, and has a wide application prospect.

The invention belongs to the technical field of lithium ion batteries, and provides an aluminum alkoxide-phosphate / phosphite electrolyte as well as a preparation method and application thereof. The aluminum alkoxide-phosphate ester / phosphite ester electrolyte comprises aluminum triethoxide, a phosphate ester / phosphite ester compound, an electrolyte solute and a non-aqueous solvent; the phosphate ester / phosphite ester compound is trimethyl phosphate, triethyl phosphate, triisobutyl phosphate, triphenyl phosphate, tripropargyl phosphate, tris (trimethylsilyl) phosphate, dimethyl methylphosphonate, diethyl ethylphosphonate, trimethyl phosphite, triethyl phosphite and triisopropyl phosphite, and the solvent is a solvent. The catalyst is one or more of triphenyl phosphite and tri (trimethylsilyl) phosphite. The electrolyte has good thermal stability and flame retardance under high voltage, and the safety of the battery is greatly improved; in addition, the electrolyte additive composition can inhibit the corrosion of the aluminum current collector, so that the side effect of the corrosion of the current collector on the battery is reduced.

The invention relates to the technical field of cellulose modification and functional materials, in particular to high-temperature-resistant carboxymethyl cellulose and a preparation method thereof.The high-temperature-resistant carboxymethyl cellulose is prepared by taking aminopropylated cellulose as a base material and matching with a composite modifier composed of triphenyl phosphate, sodium tetraborate and sodium silicate according to a specific proportion; the preparation method comprises the following steps of: preparing a modified SiO2 / montmorillonite and a composite filler compounded from epoxy modified nano SiO2 / montmorillonite, modified SiO2 and modified montmorillonite, combining an alkalization-etherification-crosslinking process of adding sodium hydroxide and sodium chloroacetate step by step, and accurately controlling parameters such as reaction temperature, water content, rotating speed and sectional temperature control drying; the core problem that a traditional product is difficult to keep stable use performance for a long time in a high-temperature environment after being modified is effectively solved, and the product is high in initial viscosity and low in moisture content, can be widely applied to occasions needing high-temperature processing or use such as oil exploitation, high-temperature building materials, food processing and industrial coatings, and has wide application prospects.

The invention relates to the technical field of separation devices, in particular to a triphenyl phosphite solid catalyst separation device and method.The triphenyl phosphite solid catalyst separation device comprises a cover plate driving assembly, the bottom end of the cover plate driving assembly is fixedly connected with a shell assembly, and the inner side of the shell assembly is fixedly connected with a sealing assembly and a filtering assembly through screws; a gas control assembly is installed on the inner side of the cover plate driving assembly, the sealing assembly comprises an annular empty shell, an annular groove and a ventilation opening are formed in the inner side of the annular empty shell, rubber sealing sleeves are fixedly connected to the positions, close to the inner side and the outer side, of the annular empty shell, and a second limiting column is fixedly connected to the bottom end of the annular empty shell. A third screw hole is formed in the position, close to the lower end, of the annular empty shell, and a fourth screw hole is formed in the position, close to the periphery, of the annular empty shell. The service life is obviously prolonged.

The invention provides a combined catalyst and application thereof, and belongs to the technical field of fine chemical engineering. The combined catalyst consists of a phase transfer catalyst, an antioxidant and a buffering agent, the phase transfer catalyst is a crown ether phase transfer catalyst; the antioxidant is one or more of dilauryl thiodipropionate, disteaxyl thiodipropionate, triphenyl phosphate and pentaerythritol diphosphite ester; and the antioxidant is one or more of dibutyl thiodipropionate, disteaxyl thiodipropionate, triphenyl phosphate and pentaerythritol diphosphite ester. The buffering agent is one or more of potassium carbonate, sodium hydroxide and sodium bicarbonate. The combined catalyst is high in activity, and when the combined catalyst is used for a reaction for synthesizing sodium thiocyanate and chloropropyltriethoxysilane, the conditions are mild, the dosage of the combined catalyst is small, control is easy, operation is easy, the synthesis reaction time is short, the yield is high, few by-products are generated, the production cost is reduced, and the yield and quality of the product are improved.

The present application relates to the technical field of water-based acrylic modified alkyd resin, especially to the field of IPC C08F283, further, to a triphenyl phosphite modified water-based alkyd resin and a preparation method thereof, wherein the raw materials include, by mass fraction, 20-30 parts of fatty acid, 10-20 parts of polyhydric alcohol, 12-20 parts of dibasic acid, 2-6 parts of benzoic acid, 0.02-0.08 parts of catalyst, 0.05-0.15 parts of triphenyl phosphite, 1.5-4.0 parts of dimethylbenzene, 18-25 parts of cosolvent, 2-5 parts of acrylic monomer, 0-15 parts of acrylic ester monomer, 0.3-1.0 parts of initiator and 3-6 parts of neutralizing agent.The present application uses triphenyl phosphite as an antioxidant, reduces the color number of the resin, improves the water resistance of the resin to a certain extent, improves the catalytic efficiency of the catalyst and shortens the synthesis time.

The application provides a combination catalyst and application thereof, and belongs to the technical field of fine chemical industry.The combination catalyst is composed of a phase transfer catalyst, an antioxidant and a buffer agent; the phase transfer catalyst is a crown ether phase transfer catalyst; the antioxidant is one or more of dilauryl thiodipropionate, dioctadecyl thiodipropionate, triphenyl phosphite and pentaerythritol diphosphite; and the buffer agent is one or more of potassium carbonate, sodium hydroxide and sodium bicarbonate.The combination catalyst has high activity, and when used in the reaction of synthesizing sodium thiocyanate and chloropropyl triethoxysilane, the combination catalyst has mild conditions, small dosage, easy control, simple operation, short reaction time, high yield, few by-products, reduced production cost, and improved product yield and quality.

This invention relates to the field of refrigerants, specifically to a mixed refrigerant and its preparation method. By weight, the refrigerant comprises 85-95 parts of a basic refrigerant, 1-5 parts of a flame retardant, 1-10 parts of a lubricating oil, and 0.1-0.5 parts of a stabilizer. The basic refrigerant is a mixture of R32, R1234ze(E), and R1234yf in a mass ratio of (18-28):(45-60):(15-25). The stabilizer is a mixture of triethyl orthoformate, triphenyl phosphite, and methylbenzotriazole in a mass ratio of (0.1-0.15):(0.1-0.15):(0.15-0.2). This refrigerant has a low GWP, good flame retardant properties, and good stability.

The application discloses a preheating type heating mechanism of a triphenyl phosphite synthesis reaction kettle and a use method thereof, which comprises a heating mechanism capable of heating and circulating liquid, and communication mechanisms are arranged at liquid output and input ends of the heating mechanism; the communication mechanisms comprise two plug-in blocks capable of reciprocating upward and downward or leftward and rightward; a furnace wall is in a cavity shape, the outer wall of the reaction furnace is provided with plug-in grooves in a linear array, the whole is heated by using a water bath heating method, temperature control is more accurate, and the whole can realize connection and separation with a heat source under the action of the plug-in blocks and the plug-in grooves, so that the reaction furnace is separated from the heat source when cooling is needed, the heat source continues to keep a heating state, and the reaction furnace can be cooled, the whole is in two states and does not interfere with each other, when combination is needed, heating can be directly carried out without preheating, preheating time is reduced, and reaction efficiency is increased, and therefore, the whole can be widely applied to the synthesis of triphenyl phosphite.

The invention provides a bio-based material-based antifouling anticorrosive paint, which comprises a primer and a finish, the primer comprises a component A and a component B, and the finish comprises a component A and a component C; the component A is prepared from the following components in parts by weight: 25 to 35 parts of first bio-based polyol, 20 to 30 parts of polymethylene polyphenyl polyisocyanate, 0.1 to 0.5 part of triphenyl phosphite, 15 to 30 parts of environment-friendly solvent and 5 to 8 parts of low surface energy modifier; the component B is prepared from 30 to 40 parts of second bio-based polyol and 100 to 130 parts of first pigment; the component C is prepared from 30 to 40 parts of third bio-based polyol, 15 to 20 parts of second pigment, 15 to 22 parts of coupling agent, 5 to 10 parts of environment-friendly antifouling agent, 3 to 6 parts of structural aid and 80 to 100 parts of anticorrosive pigment. Related preparation methods are also provided. The coating provided by the invention can realize efficient cooperation of antifouling and anticorrosion functions, is green and environment-friendly in the whole life cycle, and is durable in a dynamic service environment.

This invention discloses a recrystallization purification apparatus and its method for preparing triphenyl phosphite. The apparatus includes a crystallization tank for triphenyl phosphite, wherein a filtration section and a crystallization section are arranged sequentially from top to bottom. A transmission assembly is located at the upper part of the crystallization tank, and the transmission assembly passes through the filtration section and the crystallization section sequentially from top to bottom. The triphenyl phosphite solution to be crystallized is introduced into the crystallization tank through the inlet, and passes through the filtration section and the crystallization section in sequence, filtering out impurities in the triphenyl phosphite solution before being guided to the crystallization section for recrystallization. This invention enables double filtration of the triphenyl phosphite solution, and the filter disc can be easily and quickly disassembled for cleaning and replacement of the internal filter screen.

The flame-retardant fireproof explosion-proof high-strength aramid fabric core rubber conveying belt for the underground coal mine comprises a belt core layer, an upper covering rubber layer and a lower covering rubber layer, the raw material components of the upper covering rubber layer and the lower covering rubber layer comprise chlorinated polyethylene rubber master batches containing an explosion-proof additive; the chlorinated polyethylene rubber master batch is prepared from the following raw materials in parts by weight: 100 to 110 parts of an adsorption material, 3 to 5 parts of heptadecafluorodecyl trimethoxy silane, 4 to 6 parts of hydrogenated castor oil, 1 to 2 parts of montmorillonite powder, 1 to 2 parts of zinc stearate, 0.5 to 1 part of triphenyl phosphate, 3 to 5 parts of vinyl trimethoxy silane and 30 to 50 parts of chlorinated polyethylene rubber. The raw material components of the covering rubber comprise the flame retardant and the chlorinated polyethylene rubber master batch containing the anti-explosion additive, when the conveying belt passes through a gas trace accumulation area, the rubber material can actively adsorb part of methane molecules, the methane concentration is reduced, the safety performance is improved, the bonding strength of the core layer and the covering rubber is high, and the anti-explosion effect is good. The conveyor belt can maintain stable performance for a long time and is long in service life.

A lithium battery fast charging electrolyte relates to the technical field of lithium battery electrolytes, and the electrolyte is a system formed by an organic solvent, a lithium salt and a functional additive. The organic solvent is a cyclic and chain carbonate compound system, the lithium salt adopts a compound form with lithium hexafluorophosphate as a main component and lithium bis (fluoro) oxalato borate as an auxiliary component, the functional additive is a combination of a benzene-15-crown-5 or benzene-18-crown-6 specific chelating agent, a triphenyl phosphate free radical scavenger and a fluoroethylene carbonate film-forming agent, and the electrolyte is a mixture of the organic solvent, the lithium salt and the functional additive. The three components form a chelating-clearing-interface stabilizing synergistic effect. The electrolyte can effectively reduce the concentration of free ferric ions, block chain type side reaction, strengthen the stability of an electrode interface and remarkably improve the fast charge cycle and high-temperature storage performance of the battery, and a reliable electrolyte solution is provided for the fast charge type lithium iron phosphate battery.

Provided is a method for preparing triphenylphosphine, comprising reacting triphenylphosphine oxide and triphenyl phosphite as follows. The method uses a one-step process to synthesize triphenylphosphine, and involves a simple process step, a high reaction yield, high product purity and low process cost, and does not need to use a solvent and therefore reduce emission of waste liquids. In addition, the method also synthesizes a high-value byproduct triphenyl phosphate that can be used in great quantity in the fields such as flame retardants, plasticizers and stabilizers, and said co-production greatly reduces the cost of raw materials and the cost of the production process, thereby achieving substantial cost advantages. The raw materials of the method do not involve high-risk chemicals; and since triphenyl phosphate is synthesized at the same time, the method achieves a remarkable flame retardant effect and high process safety.

The invention discloses a method for simultaneously detecting toluene diisocynate and triphenyl phosphite in a central venous catheter. According to the method, the toluene diisocynate and the triphenyl phosphite in the central venous catheter can be rapidly and synchronously separated and detected under the same chromatographic condition. A sample is extracted by adopting an organic solvent, and qualitative and quantitative analysis is carried out by combining a gas chromatography technology. The method is characterized in that through specific pretreatment and instrument condition optimization, the technical problem that two compounds with large property difference are difficult to synchronously detect is solved. According to the method, rapid and accurate simultaneous detection can be realized, the sensitivity is high, the repeatability is good, and an efficient and reliable detection means is provided for evaluating the safety of the central venous catheter.

The invention discloses a bio-based polyurethane fireproof and anticorrosive integrated coating and a preparation method thereof, the bio-based polyurethane fireproof and anticorrosive integrated coating comprises a component A and a component B, and the mass ratio of the component A to the component B is 2: 3; the component A is prepared from 31 to 41 parts by mass of a bio-based material, 22 to 32 parts by mass of polymethylene polyphenyl polyisocyanate, 0.2 to 0.6 part by mass of triphenyl phosphite and 22 to 37 parts by mass of an environment-friendly solvent; the component B comprises 30-50 parts by mass of a bio-based material, 13-18 parts by mass of a flame retardant, 38-58 parts by mass of a triazine macromolecular charring agent, 10-30 parts by mass of a high-temperature-resistant filler and 1-4 parts by mass of hydrophilic silicon dioxide aerogel; the bio-based material is castor oil. The problems that an existing steel structure and the like adopting an anti-corrosion and fireproof composite coating are prone to layering and peeling off are solved.

The present disclosure relates to a diisocyanate stabilizer, use of the diisocyanate stabilizer in stabilizing diisocyanate, and a diisocyanate composition comprising the stabilizer. The diisocyanate stabilizer comprises a sterically hindered phenol different from butylated hydroxytoluene, a thioether, and a phosphite different from triphenyl phosphite. The present disclosure aims to provide a diisocyanate stabilizer that can maintain diisocyanate stable during long-term storage and heating conditions.