70 results about "Cyanate" patented technology

The invention relates to a method for regulating and deacidifying in a bioleaching process of low-grade copper sulphide ore, aiming at the problem of excessive acid caused by excessive oxidation of pyrite in a dump leaching system, a thiocyanate bactericide is added into the bioleaching system of the low-grade copper sulphide ore, and the thiocyanate bactericide is dissolved in a spray liquid of the bioleaching system, and is added into the spray liquid of the bioleaching system; under the catalytic action of mineral leaching microorganisms, oxidation of ferrous ions is enhanced, so that the oxidation-reduction potential of a solution is increased, oxidation of pyrite is intensified, acid accumulation is excessive, the thiocyanate bactericide can remarkably inhibit the activity of part of sulfur-oxidizing bacteria and even kill part of sulfur-oxidizing bacteria, and therefore the activity of ferrous oxide is reduced; compared with the prior art, the method has the advantages that the sulfur oxidation activity of microorganisms is greatly influenced, but the oxidation influence on iron is relatively small, so that the acid leaching is reduced under the condition that the copper leaching of the copper sulfide ore is not influenced, the copper leaching is not influenced, the acid leaching is reduced, the production cost is reduced, the environmental influence is reduced, and the like.

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing dicyandiamide by urea pyrolysis with anti-scaling properties. The method includes a reaction process using urea, alkaline earth metal oxides, and a scale inhibitor dopant as raw materials. The scale inhibitor dopant includes at least one of silicon dioxide and titanium dioxide, and its weight accounts for 0.1% to 5% of the weight of the alkaline earth metal oxides. Experiments show that introducing a scale inhibitor dopant into the reaction system can alter the surface tension of the isocyanate melt, helping to improve the surface properties and rheological state of the intermediate melt. This reduces material adhesion and aggregation on the reactor wall, lowers the risk of scaling and clogging, and may even eliminate scale buildup on the reactor wall, thereby improving the stability of continuous production.

The application relates to the technical field of organic synthesis, and discloses a synthesis method of benzthiazuron, which comprises the following steps: step 1, addition reaction of alpha-methyl styrene and hydrogen chloride gas, and degassing to obtain a first reaction liquid; step 2, substitution reaction of the first reaction liquid and cyanate in the presence of a zinc chloride catalyst, and filtration to obtain a second reaction liquid containing isocyanate; and step 3, construction of an inorganic salt aqueous solution system with a density of 1.05-1.10 g / ml and a pH of 9-10, dropwise addition of the second reaction liquid into the system for condensation reaction with o-chlorobenzylamine, and post-treatment and refinement to obtain a target product. The non-phosgene route of chloro-isocyanate substitution is adopted, and the use of the toxic phosgene is completely avoided; the salting-out effect and interface control generated by the specific high-density salt solution effectively inhibit the isocyanate hydrolysis side reaction, and the reaction yield and product purity are obviously improved.

The invention relates to a reaction kettle for preparing bisphenol A cyanate resin, and belongs to the technical field of resin preparation, the reaction kettle comprises a resin preparation box, two groups of crushing boxes are arranged on the upper surface of the resin preparation box, and cover plates are arranged on the upper surfaces of the two groups of crushing boxes. A threaded rod and an extension rod are driven to rotate through a motor, a rotating shaft and a scraping plate C are driven to rotate under the meshing connection action of a bevel gear A and a bevel gear B, a rotating rod is driven to rotate integrally under the clamping connection action of a clamping block and a clamping groove, and solid bisphenol A cyanate monomers and solid polyphenyl ether are cut and crushed; raw materials meeting particle conditions penetrate through the filter screen frame and fall to the lower part of the crushing box, a bisphenol A cyanate monomer and polyphenyl ether are rotationally dispersed more uniformly in cooperation with the dispersion frame, and the polyphenyl ether and bisphenol A cyanate monomer melt are mixed more uniformly under the rotation action of the stirring blades and the scraper A, so that the overall mixing efficiency is effectively accelerated.

The invention belongs to the technical field of resin materials, and particularly relates to a preparation method and application of low-dielectric dual-curing resin. According to the present invention, the naphthalene ring system in the 1, 5-naphthalene diisocyanate (NDI) structure has high molecular symmetry and low polarity, and provides a low dielectric constant; hydroxypropyl acrylate (HPA) is an organic compound containing a hydroxyl group and an acrylic acid group. The preparation method comprises the following steps: reacting 1, 5-naphthalene diisocyanate with hydroxypropyl acrylate according to a molar ratio of 1: 2 to obtain photocurable naphthyl acrylate (DP) with excellent low dielectric property, mixing a monomer of the naphthyl acrylate (DP) with bisphenol E cyanate (BP) to obtain resin, and mixing the monomer of the naphthyl acrylate (DP) with the bisphenol E cyanate to obtain the low-dielectric dual-curing resin. And the dielectric material is suitable for high-speed communication, new energy electronic packaging and other application scenes with high dielectric property requirements.

The invention relates to the technical field of organic synthetic chemistry, in particular to a preparation method and medical application of selenophosphate promoted by tris (pentafluorophenyl) borane. The preparation method of the selenophosphate ester comprises the following steps: under the action of tris (pentafluorophenyl) borane, taking seleno cyanate ester and phosphate ester as reaction raw materials, and carrying out stirring reaction under a certain temperature condition to obtain the selenophosphate ester compound. The synthesis method is mild in condition, does not need a metal catalyst and an oxidizing agent, and accords with the idea of green chemistry. The method also has the advantages of simplicity in operation, few byproducts, high purity and the like. In-vitro anti-inflammatory experiments prove that the selenophosphate compound disclosed by the invention has remarkable anti-inflammatory activity, can effectively inhibit the generation of inflammatory factors and cell inflammatory response, can be used as an active ingredient of anti-inflammatory drugs, and has a wide clinical application prospect.

The invention discloses a method for evaluating seawater resistance of a cyanate ester-based composite material for a structural material, and belongs to the field of material performance testing, and the method comprises the following steps: S1, preparing a sample plate of the cyanate ester-based composite material for seawater resistance testing, and cutting the sample plate into a sample sheet I, a sample sheet II and a sample sheet III; s2, soaking the sample piece I, the sample piece II and the sample piece III, and sampling and testing at different time nodes; s3, obtaining a fitting equation about the water absorption rate, the interlayer shear strength and the glass transition temperature; s4, converting into a long-time fitting equation; s5, calculating an evaluation score; s6, comparing the evaluation score S with the required score of the allowable value of the cyanate ester matrix composite to obtain an evaluation conclusion; the evaluation score is calculated through fitting equations corresponding to the water absorption rate, the interlaminar shear strength and the glass transition temperature, and the method is used for predicting the seawater resistance of the cyanate ester matrix composite for the structural material.

The invention discloses a method for recovering precious metals from an extracted organic phase. According to the method for recycling the precious metal from the extracted organic phase, thiourea-thiocyanate (TU-SCN-) is adopted to cooperate with a complexing back-extraction agent A to conduct multi-stage back-extraction on the extracted organic phase O, and metal recycling in the extracted organic phase is achieved. According to the method for recovering the precious metal from the extracted organic phase, a thiourea-thiocyanate (TU-SCN-) synergistic complexing back extraction system is adopted for recovering the metal from the extracted organic phase, the back extraction efficiency is high, and the metal recovery rate is high (gt; and precious metals such as gold and silver can be recovered from an organic phase at a relatively low cost.

The application belongs to the technical field of fluorocarbon surfactant application, and particularly discloses a synthesis method of sodium perfluorohexylethyl sulfonate, which comprises the following steps: (1) under the protection of nitrogen, perfluorohexylethyl iodine, potassium thiocyanate and a phase transfer catalyst are added into water and stirred to react, an organic layer is separated, and rotary evaporation is performed to obtain perfluorohexylethyl thiocyanate; (2) the perfluorohexylethyl thiocyanate is added into water and heated, and then chlorine is continuously introduced to stir to react, and filtration separation is performed to obtain perfluorohexylethyl sulfuryl chloride; and (3) the perfluorohexylethyl sulfuryl chloride is added into sodium hydroxide water solution drop by drop, and stirred to react, and after filtration, water washing, recrystallization and drying, the sodium perfluorohexylethyl sulfonate is obtained. The sodium perfluorohexylethyl sulfonate has high yield and high purity, has excellent surface activity, has excellent compounding performance with a hydrocarbon surfactant, has very good thermal stability, salt resistance and chemical stability, and meets the environmental protection requirements.

The present invention relates to a method for curing a polythiourethane transparent casting substrate, comprising the steps of: providing a first component A comprising a polythiourethane prepolymer having iso(thio)cyanate end groups, wherein the prepolymer is prepared from at least one polythiol monomer and at least one polyiso(thio)cyanate monomer, used in an amount adapted such that the molar ratio R2 of NCX groups to SH groups is in the range of 2 to 35; providing a second component B comprising at least one polythiol monomer; mixing the first and second components A and B together and filling the resulting polymerizable mixture into a molding cavity; and the weight The present invention relates to a method comprising the steps of curing a composite mixture to obtain a polythiourethane transparent substrate, wherein the prepolymer is prepared by mixing at least one polyiso(thio)cyanate monomer and at least one polythiol monomer in initial amounts such that the initial molar ratio R1 of the NCX groups / SH groups of the monomers is in the range of 0.3R2 to 0.95R2; polymerizing the mixture; and adding an additional amount of at least one polyiso(thio)cyanate monomer to the mixture such that the molar ratio of the NCX groups / SH groups of all monomers used in the preparation of the prepolymer is equal to R2, where X is O or S.

The application discloses a kind of nanocarrier of cosmetic active substance, micro-nano flow control preparation method and application, it is related to nanocarrier technology and cosmetic field.The application includes the following steps: S1, preparation of lipid phase, phospholipid and sterol are uniformly dissolved in ethanol, obtain lipid phase;S2, preparation of water phase, cyanate fruit polysaccharide and polypeptide are uniformly dissolved in distilled water, after uniform dissolution, centrifugation, take supernatant, obtain water phase;S3, preparation of nanocarrier, lipid phase and water phase are transported to the inside of micro-nano flow control chip and combined, lipid phase and water phase are combined to form nanocarrier in the inside of micro-nano flow control chip, obtain precursor solution containing nanocarrier;S4, screening nanocarrier, precursor solution is reduced pressure distillation, then centrifugal removal organic solvent and free un-wrapped component, obtain nanocarrier.Polypeptide is dissolved in water phase, can keep the active conformation of polypeptide peptide chain in larger amount, so that nanocarrier can deliver active substance to the specified structure layer of skin.

The application discloses a preparation method of sulfentrazone intermediate, which comprises the following steps: in a solvent, substitution ring-closing reaction of cis-trans isomer compound (nitro hydrazone) shown in formula II and cyanate salt is carried out to generate sulfentrazone intermediate shown in formula III. The scheme provided by the application solves the problems in the prior art, such as the use of a large amount of inorganic reducing agent, such as sodium sulfite, in the production of raw material phenylhydrazine for preparing triazolinone through phenylhydrazine, generation of a large amount of solid waste, and low atomic economy; the scheme solves the problems in the prior art, such as the use of a large amount of sulfite reducing agent and sodium hypochlorite oxidant in the production of raw material phenylhydrazine for preparing triazolinone through phenylhydrazine, generation of a large amount of mixed salt, and low chloro-substitution selectivity of sulfentrazone prepared by using phenylhydrazine as raw material; the scheme solves the problems, such as the reduction of diazonium salt to hydrazine, the oxidation of hydrazine to hydrazine, and the like; the scheme directly utilizes intermediate hydrazine and then utilizes cyanate salt ring-closing, and compared with the prior art, the scheme is shortened by 3 steps, and energy consumption and labor intensity are greatly reduced.

The invention relates to a method for preparing fenbendazole by taking m-dichlorobenzene as a raw material. The method comprises the following steps: nitrating m-dichlorobenzene to obtain 1, 3-dichloro-4-nitrobenzene; the 4-chloro-3-nitrodiphenyl sulfide reacts with thiophenol salt to obtain 4-chloro-3-nitrodiphenyl sulfide; reacting with ammonia to obtain 4-amino-3-nitrodiphenyl sulfide; reducing to obtain 3, 4-diaminodiphenyl sulfide; and finally, cyclizing with methyl cyanate to obtain benthioimidazole. The method has the advantages that cheap m-dichlorobenzene is used as a starting raw material, benzenethiol is efficiently synthesized through nitration, thiophenol substitution, ammoniation, reduction and cyclization reaction, the defect that expensive or difficult-to-obtain raw materials are used in the prior art is avoided, and the method is novel in route, simple and convenient to operate, mild in reaction condition, high in total yield and suitable for industrial production.

Compositions and methods are disclosed for improving seed quality. For example, treating a stand of seed crops with a seed crop treatment that includes an effective amount of cyanate, thiocyanate, an acceptable salt of cyanate or thiocyanate, an ester of cyanate or thiocyanate, an isocyanate or isothiocyanate, or a combination thereof results in one or more improved seed qualities compared to a control. The improved seed qualities may include, but are not limited to, enhanced seed vigor, increased quantity of saleable seed, increased proportion of saleable seed, increased uniformity of seed shape and size, and desirable bag weight.

The invention provides a resin composition and application thereof. The resin composition comprises the following components: cyanate ester resin, bismaleimide resin, epoxy resin and nitride filler, based on the total weight of the resin composition being 100%, the content of the cyanate ester resin is 4%-17%, the content of the bismaleimide resin is 2%-12%, and the content of the epoxy resin is 3%-16%; the nitride filler comprises (A) spherical boron nitride, (B) aluminum nitride and / or silicon nitride; the content of the spherical boron nitride is 20-40% by taking the total weight of the nitride filler as 100%. The resin composition provided by the invention has high thermal conductivity, excellent adhesive property and high heat resistance at the same time, and the metal-based copper-clad laminate prepared from the resin composition has excellent comprehensive properties in the aspects of high thermal conductivity, high reliability and high heat resistance.

This invention provides a method for purifying erythromycin thiocyanate. The method first involves dissolving crude erythromycin thiocyanate in an ester solvent under alkaline conditions; then adding thiocyanate and crystallizing under neutral to slightly alkaline conditions; followed by membrane-assisted cooling for secondary crystallization; and finally, filtration and drying to obtain purified erythromycin thiocyanate. This invention uses a membrane-assisted cooling coupled crystallization method instead of the traditional cooling crystallization method, successfully controlling the nucleation rate, eliminating explosive nucleation, and significantly improving the content and yield of erythromycin thiocyanate A.

The present invention relates to curable mixtures of reactive resins having polymerizable functional cyanate groups and linear poly (bisphenol-diorganosiloxane) copolymers, to a method for the production thereof, and to cured materials and composites obtainable therefrom which exhibit high fracture resistance. The invention based on the patent application is a result of a project funded by the Federal Education Institute under the funding code 03XP0170C. The content of the patent application is responsible for the applicant.

The application discloses a preparation method of a 7-position-hydrogen-substituted pyrazolo[1,5-a]pyrimidine compound. The preparation method comprises the following steps: contacting a compound shown in a formula (I) with a compound shown in one of formula (II) or formula (III), a thiocyanate, an iodine-containing oxidant and a solvent to react. The preparation method has the characteristics of simple operation, low cost of raw materials, wide application range of substrates and high yield, and the obtained product is an important pharmaceutical intermediate.

The invention discloses nitrous acid and ammonia nitrogen resistant nitrobacter (Nitrobacter sp.) TKz-YC01, the preservation number of the nitrous acid and ammonia nitrogen resistant nitrobacter (Nitrobacter sp.) TKz-YC01 is GDMCC No: 65729, the nitrous acid and ammonia nitrogen resistant nitrobacter (Nitrobacter sp.) TKz-YC01 has been preserved in Guangdong Microbial Culture Collection Center on March 7, 2025, is called GDMCC for short, has the preservation address of Nitrobacter sp., and is classified and named as Nitrobacter sp., and the preservation name of the nitrous acid and ammonia nitrogen resistant nitrobacter (Nitrobacter sp. TKz-YC01 is Nitrobacter sp. The nitrobacter can effectively degrade nitrite, cyanate and / or ammonium salt in water, and the nitrobacter can still effectively remove nitrogen under the impact of 30 mM ammonium salt (ammonium chloride) and 50 mM nitrite (sodium nitrite).

The invention discloses an intermediate for synthesizing 7-methylxanthine as well as a synthesis method and application of the intermediate, 4-amino-1-methylimidazole-5-carboxylic acid ethyl ester is taken as a raw material and reacts with cyanate to synthesize 4-ureido-1-methylimidazole-5-carboxylic acid ethyl ester, and finally, sodium hydroxide is used for alkali ring closing to obtain the 7-methylxanthine.

The invention discloses a metal-based isocyanate gold leaching agent and a high-temperature catalytic synthesis method thereof. The high-temperature catalytic synthesis method of the metal-based isocyanate gold leaching agent comprises the following steps: grinding and uniformly mixing a proper amount of cyanate and a metal catalyst to obtain a mixture; carrying out high-temperature roasting on the mixture to obtain a roasted product; and the roasted product is naturally cooled and crushed, and the metal-based isocyanate gold leaching agent is obtained. According to the metal-based isocyanate gold leaching agent and the high-temperature catalytic synthesis method thereof, the synthesis raw materials are simple and easy to obtain, the cost is low, the synthesis process is simple and easy to control, the production efficiency is high, the energy consumption is low, and the metal-based isocyanate gold leaching agent has excellent gold leaching performance; the method can replace sodium cyanide to realize efficient gold leaching under the original cyaniding gold leaching process and equipment.

The application discloses preparation and application of amino acid isocyanate derivative. The amino acid isocyanate derivative containing isocyanogen, carboxylate group and different side chains is prepared through esterification, neutralization, formylation, isocyanation and saponification by taking amino acid as raw material. The preparation route is simple in operation, low in raw material cost, mild in reaction condition, novel in synthesis route, high in product yield, various in product types and good in industrial conversion prospect. The prepared amino acid isocyanate derivative can be used in preparation of polyamino acid derivative or copolymer antibacterial material, so that the single type, high price and difficulty in obtaining of commercially available isocyanate is made up, the product added value is improved, the type selection of polyamino acid derivative or copolymer is expanded, and a new direction for further improving antibacterial activity is provided.

The invention relates to an anti-moisture absorption treatment method for a water-soluble mold, belongs to the technical field of water-soluble mold processing, and aims to solve the problem that a water-soluble mold for forming an annular frame of a space camera is easy to absorb moisture. The method comprises the steps that a water-soluble adhesive, a base material and water are mixed in proportion and subjected to cold press molding to form a water-soluble mold blank block, and rough machining mold blocks are obtained through drying and reserved machining allowance cutting; mixing the mold block with a cyanate ester resin block, and heating to melt the resin and form a curing layer on the surface of the mold block; and finish machining is carried out on the mold block coated with the curing layer, and demolding cloth can be coated after finish machining. Moisture absorption prevention protection of the water-soluble mold is achieved through the cyanate resin curing layer, the dimensional stability of the mold is guaranteed, and then the subsequent annular frame forming precision is guaranteed.

The invention discloses a method for preparing calcium cyanamide based on two-stage reaction of a rotary tube furnace, and relates to the technical field of inorganic chemical synthesis, and the method comprises the following steps: obtaining industrial urea and self-burning calcium oxide; the method comprises the following steps: uniformly mixing and grinding industrial urea and self-burning calcium oxide according to a mass ratio of 2: 1 to obtain a reaction precursor, and putting the reaction precursor into a rotary tube furnace; introducing high-pressure inert protective gas into the rotary tube furnace to replace air, controlling the rotary tube furnace to continuously rotate, and controlling the reaction precursor in the rotary tube furnace to react at the constant temperature of 240 DEG C for 2 hours to obtain a calcium cyanate intermediate; continuously introducing high-pressure inert protective gas into the rotary tube furnace, controlling the calcium cyanate intermediate in the rotary tube furnace to perform high-temperature reconstruction reaction for 2.0 hours at the temperature of 650 DEG C and the pressure of 2.2 MPa, and removing carbon dioxide to obtain a target calcium cyanamide product. According to the invention, a brand-new, more efficient, more environment-friendly and easier-to-industrialize calcium cyanamide production path is constructed.

The invention relates to a polymerizable composition comprising a) at least one polyiso (thio) cyanate and at least one prepolymer having thiol end groups, obtained from the reaction of a mixture of at least one polythiol and at least one polymerizable compound of formula (I), or b) a prepolymer of at least one polythiol and at least one isocyanate or isothiocyanate end group having the formula-NCX, where X is O or S, obtained from the reaction of a mixture of at least one polyiso (thio) cyanate and at least one polymerizable compound having the formula (I), where R1 and R2 represent a hydrogen atom, a substituted or unsubstituted alkyl group, a (hetero) aryl group, or R1 and R2 together form a divalent group having the formula-R1-R2-, where-R1-R2-represents a substituted or unsubstituted alkylene group, Z represents OH, SH, NH2 or NHR4, where R4 represents a substituted or unsubstituted alkyl or (hetero) aryl group, and R3 represents a hydrogen atom, a substituted or unsubstituted alkyl group, (hetero) aryl group, or a CR '1R' 2Z 'group, where R' 1, R '2 and Z' are defined as R1, R2 and Z. (Formula I))

The invention belongs to the technical field of organic synthesis, and particularly relates to a synthesis method of tert-butyl isocyanate. The synthesis method comprises the following steps: adding a composite catalyst, a cosolvent, cyanate and a stabilizer into a diester solvent, uniformly stirring, and heating to a reaction temperature; dropwise adding tert-butyl chloride at the reaction temperature, and after dropwise adding is completed, carrying out heat preservation reaction at the temperature; and after the reaction is finished, carrying out reduced pressure distillation and rectification to obtain the tert-butyl isocyanate. The bottleneck of the traditional process is broken through, the reaction period is effectively shortened, and the energy consumption is reduced; the product purity and the total yield are improved and are far superior to those in the prior art. In addition, the preparation process has the advantages of mild conditions, no need of special equipment, cheap and easily available raw materials, abandonment of highly toxic raw materials, no generation of a large amount of waste salt and toxic gas, safety and environmental protection.

The invention discloses a leaching method for reducing mercury leaching in mercury-containing gold ore, and belongs to the field of metal refining. The pH value of the mercury-containing gold ore pulp is adjusted to 11.5 or above, soluble ferrocyanate is added, and stirring and leaching are conducted. The concentration of CN <-> in the ore pulp is detected in the leaching process, and when the concentration of CN <-> is larger than 100 mg / L, a certain amount of soluble copper salt is added into the ore pulp to control the concentration of CN <-> to be smaller than 100 mg / L; and after leaching is finished, ore pulp is filtered to obtain a leaching pregnant solution of the mercury-containing gold ore, a leaching barren solution is obtained after precious metal in the pregnant solution is recycled, the Fe content in the leaching barren solution is detected, soluble ferrocyanate is supplemented according to the Fe content, and then the leaching barren solution returns to a leaching system to serve as slurry mixing water of the mercury-containing gold ore to be recycled. According to the method, the ferrocyanate which is safer and more environmentally friendly than cyanide is adopted as a leaching agent, compared with an existing method, the agent system is simplified, organic matter influencing the leaching index is not introduced, and leaching of Hg is greatly reduced.

The application discloses a kind of organic silicon-cyanate resin-based electromagnetic shielding materials and preparation methods thereof, relate to electromagnetic shielding material technical field, using dicyclopentadiene type cyanate ester, N,N-dimethylformamide, both end amino silicone oil is under the action of catalyst Block prepolymerization, preparation obtains organic silicon modified cyanate ester prepolymer, continue electromagnetic shielding filler in situ grafting dispersion in organic silicon modified cyanate ester prepolymer, form organic silicon-cyanate / filler prepolymer composition, obtain organic silicon-cyanate resin-based electromagnetic shielding material by heat curing process.The application uses modified cyanate ester resin as organic framework, realizes the directional uniform dispersion of nanoparticle cluster in resin using surface grafting technology, constructs three-dimensional lap joint " eddy current energy consumption-phonon " network with reflection and absorption electromagnetic wave function, and prepares high electromagnetic shielding composite material satisfying 6G communication and electronic device high-speed, high-frequency operating performance needs.

The invention provides high-heat-resistance low-dielectric-loss tripolymer resin as well as a preparation method and application thereof, and relates to the technical field of resin materials. The preparation method comprises the following steps: mixing the melamine with the bismaleimide resin and the isocyanate, adding the solvent and the accelerant, and reacting under a heating condition to obtain the high-heat-resistance low-dielectric-loss tripolymer resin. The trimer resin with high heat resistance and low dielectric loss is prepared by the preparation method. The high-heat-resistance low-dielectric-loss tripolymer resin can be used for preparing a copper-clad plate. According to the preparation method disclosed by the invention, isocyanate is used for replacing cyanate, melamine is introduced to construct a brand new curing system, and isocyanate and melamine have no self-polymerization characteristic and are subjected to curing reaction with bismaleimide resin, so that the trimer resin with high heat resistance and low dielectric loss is prepared.

The application discloses an anti-interference airport FOD radar antenna cover composite material and a preparation method thereof. The application adopts an epoxy functional group functionalized silica aerogel precursor solution, and introduces a nanometer aluminum foil with surface grafted epoxy groups to construct a layered structure. The silica aerogel not only forms a stable interpenetrating network structure with a cyanate-epoxy resin matrix through chemical bonding, but also forms a directional reinforcing skeleton inside the aerogel due to the two-dimensional sheet characteristics of the nanometer aluminum foil. The shrinkage stress generated during the curing process of the composite material can be effectively dispersed and absorbed, the interface defects such as micro-cracks and pores generated due to the shrinkage of the resin during curing are greatly reduced, the water absorption and environmental sensitivity of the composite material are reduced, the dielectric properties of the composite material are stabilized, the bending strength and impact toughness of the composite material are simultaneously improved, and the composite material can better resist the impact of hail, tool falling and other foreign matters in the operation of the airport.