37 results about "Toluenediamine" patented technology

The invention provides a preparation method of a catalyst, the catalyst and a diethyltoluenediamine synthesis method based on the catalyst, and belongs to the technical field of chemical synthesis. After the surface of phosphoric acid modified zeolite is coated with aluminum oxide, a layer of quantum dot intercalation metal layered oxide is coated, the surface is modified by polydopamine, citric acid is coupled, cerium oxide and ruthenium oxide are loaded, and the catalyst is prepared. The prepared catalyst can well improve the conversion rate of toluenediamine, inhibit side reactions, improve the anti-coking capability, reduce the generation of carbon deposits, prevent the agglomeration of catalyst particles, prolong the service life, improve the mechanical strength and thermal stability, reduce the activation energy in the synthesis process of diethyltoluenediamine, make the reaction conditions milder, make the yield higher, and reduce the production cost. And the method can be repeatedly used and has a wide application prospect.

The invention provides a method for preparing toluene diisocynate through a phosgene method, and belongs to the technical field of toluene diisocynate preparation. According to the method, liquid phosgene is atomized into atomized phosgene through a high-pressure spraying device, the atomized phosgene is in countercurrent contact with a toluenediamine solution sprayed into a phosgenation reactor, the contact area of the atomized phosgene and the toluenediamine solution is increased, and the phosgenation reaction process is accelerated. In addition, due to the arrangement of the liquid homogenizer, the contact area between the atomized phosgene and the toluenediamine solution is increased, the reaction rate between the atomized phosgene and the toluenediamine solution is increased, and side reactions are reduced. Meanwhile, the phosgene participates in the phosgenation reaction in the form of mist droplets and is not dissolved in the solvent, so that the use of the solvent is greatly reduced, the concentration of the phosgene in the phosgenation reactor is improved, and side reactions are reduced. The liquid phosgene is subjected to high-pressure spraying treatment, so that the use of a solvent is saved, and subsequent solvent separation is facilitated. After the decomposition reaction is finished, hydrogen chloride gas and unreacted phosgene are separated in a freezing mode, phosgene recovery is achieved, and the recovery mode is simple.

The invention discloses a preparation method of dimethyl thio toluenediamine, which comprises the following steps: continuously introducing dimethyl disulfide into a reaction system containing diaminotoluene and a catalyst for reaction, and evaporating and condensing the dimethyl disulfide in the reaction process so as to bring out a byproduct methyl mercaptan, after the reaction is finished, purifying and decoloring by adopting a neutralization distillation method to obtain dimethyl thio toluenediamine; the neutralization distillation method comprises the following steps: adding dimethyl disulfide into a reaction solution after the reaction is finished for dilution, then filtering the reaction solution to obtain a filtrate, adding an alkali solution into the filtrate for neutralization, heating and stirring, and finally carrying out reduced pressure distillation. The preparation method disclosed by the invention has the advantages of small catalyst dosage, short reaction time, high product yield and economic and environment-friendly purification and decoloration modes.

The invention belongs to the technical field of electromagnetic wave absorbing materials, and discloses a composite coating with electromagnetic protection and explosion-proof functions as well as a preparation method and application of the composite coating. The coating comprises 40 to 60 parts of polycarbodiimide modified diphenylmethane diisocyanate, 40 to 60 parts of a semi-prepolymer which is synthesized from polycarbonate diol with the equivalent weight of 1000 and has the NCO content of 10 to 20 percent, 73 to 100 parts of a polyether amine curing agent, 15 to 20 parts of diethyl toluenediamine or dimethyl thio toluenediamine, 0.5 to 2 parts of calcium carbonate and 3 to 6 parts of magnetic powder. And the two components are quickly reacted and molded through a spraying process. According to the invention, the polyurea elastomer is used as a matrix, so that the coating is endowed with excellent impact resistance, explosion-proof characteristics, water impermeability, oil resistance, low temperature resistance and other environmental tolerance; meanwhile, an adjustable electromagnetic wave absorption function is realized by doping specific magnetic powder. The coating is simple in preparation process and excellent in comprehensive performance, and is particularly suitable for equipment surfaces with high requirements on stealth and survival protection, such as oil storage equipment.

The application discloses the technical field of organic synthesis and relates to a high-yield synthesis method of diethyltoluene diamine; the method comprises the following steps: firstly, a polyoxometalate-organic framework hybrid material is activated at medium temperature under nitrogen protection, and m-toluene diamine is pretreated by vacuum dehydration; then, the activated catalyst and the dehydrated m-toluene diamine are added into a reaction kettle, ethylene is introduced at high temperature after nitrogen replacement, and reaction is carried out; the reaction mixture is cooled and filtered, the filter cake is washed and dried, and then is activated and regenerated at medium temperature; the filtrate is subjected to rectification to collect main distillates to obtain the product. The catalyst is prepared by the following steps: reaction of phosphotungstic acid and aminopropyltrimethoxysilane, condensation with p-benzene dicarboxaldehyde, solvothermal crystallization with nickel nitrate, supercritical carbon dioxide treatment and calcination. The method has the advantages of high catalyst activity, reusability, mild reaction conditions and high yield of diethyltoluene diamine.

A first aspect of the invention relates to a mixture comprising 2,4- toluene diamine and 2,6-toluene diamine and comprising less than 10 weight-ppm of an amino methyl cyclohexenone compound of formula (I) based on the total weight of the mixture being 100 weight-%. In a second aspect, the invention is directed to a method for controlling a hydrogenation process for preparing toluene diamine (TDA) from dinitrotoluene (DNT), said TDA having a boiling temperature range BTRTDA with a lower boiling temperature limit value TTDA(L) and an upper boiling temperature limit value TTDA(U). A third aspect relates to a mixture comprising at least 2,4- toluene diamine and 2,6-toluene diamine obtained or obtainable from the method according to the second aspect. A fourth aspect of the invention is directed to a use of the mixture according to the first aspect of the invention or of the mixture of the third aspect of the invention for the preparation of toluene diisocyanate (TDI). In a fifth aspect, the invention relates to a process for preparing toluene diisocyanate (TDI) comprising: (I) Providing a mixture according to the first aspect of the invention or of the mixture of the third aspect of the invention; and (II) Phosgenation of the mixture provided in (I), thereby obtaining TDI.

The present invention relates to a process for preparing a rigid polyisocyanurate foam comprising the reaction of a composition (A) including a polyesterol, a foaming agent comprising formic acid, a catalytic system comprising at least one trimerization catalyst, and at least one polyisocyanate as component (B), wherein composition (A) further comprises at least one polyether alcohol prepared by the addition of alkylene oxides to toluenediamine. The present invention also relates to a rigid polyisocyanurate foam obtained or obtainable by the process of the present invention and to the use of said rigid polyisocyanurate foam as an insulating material.

The present invention provides a method for producing LC-grade diethyltoluenediamine, belonging to the technical field of organic chemistry. Under inert gas protection, toluenediamine and a catalyst are mixed, heated and stirred, ethylene and a composite gas are introduced simultaneously, the mixture is kept warm and pressurized for reaction, the temperature is lowered, the pressure is released, the product is discharged, and the liquid is refined to produce LC-grade diethyltoluenediamine. The method for producing LC-grade diethyltoluenediamine is simple, exhibits few side reactions, produces a high product yield and purity, is readily industrially applicable, has a wide range of raw material sources, operates under mild reaction conditions, and the catalyst is easily separable and can be reused multiple times, thus having broad application prospects.

This invention relates to a method for recovering valuable substances from polyurethane foam, comprising: (A) providing a polyurethane foam based on an isocyanate component and a polyether polyol component; (B) chemically decomposing the polyurethane foam by reacting it with an organic chemical decomposition agent and water, wherein the organic chemical decomposition agent is selected from: (i) a primary or secondary chemically decomposable amine, (ii) a chemically decomposable amino alcohol having a primary or secondary amino group, (iii) a chemically decomposable alcohol, or (iv) a mixture of two or more of the said organic chemical decomposition agents; (C) distilling off the organic chemical decomposition agent and optionally toluene diamine or a portion thereof generated in (B), wherein solid components can be separated before and / or after distillation; (D) extracting the polyether polyol with an organic solvent, wherein an acid and water are added, and a polyol phase is obtained after separation of the acidic aqueous phase; and (E) post-treating the polyol phase to obtain at least one polyether polyol.

The invention relates to the field of reverse osmosis membranes, in particular to a preparation method of an organic-solvent-resistant reverse osmosis membrane, which comprises the following steps: preparing a base membrane; the base membrane is coated with an aqueous phase solution, the aqueous phase solution is prepared from the following raw materials in percentage by weight: 2 to 6 percent of quaternized modified 2.6-toluenediamine, 0.1 to 1 percent of 4-chloro-m-phenylenediamine, 2 to 4 percent of a pH regulator, 0.15 to 0.4 percent of a surfactant, 0.5 to 2.5 percent of an acid acceptor, 1 to 3 percent of modified zirconium-based organic framework filler and the balance of water, and drying is performed after coating; and coating an oil phase solution, and drying to obtain the organic solvent-resistant reverse osmosis membrane. The reverse osmosis membrane provided by the invention can still keep stable organic solvent resistance and separation performance in a strong-polarity organic solvent environment.

The present invention relates to a process for the preparation of toluene-2, 5-diamine or a salt thereof. The invention also relates to a method for preparing the toluene-2, 5-diamine sulfate. According to the method, carcinogenic and allergenic raw materials (such as o-toluidine) are not used, a brand-new synthesis route is adopted, and the method has the advantages that the used initial raw materials are easy to obtain, the reaction environment is safe, operation is easy, an intermediate is stable and easy to separate, and no use-prohibited components (such as o-toluidine) are used or generated.

The invention provides a catalyst and a synthesis method of diethyltoluenediamine based on the catalyst, and belongs to the technical field of chemical synthesis. After the surface of phosphoric acid modified zeolite is coated with aluminum oxide, a layer of quantum dot intercalation metal layered oxide is coated, the surface is modified by polydopamine, citric acid is coupled, cerium oxide and ruthenium oxide are loaded, and the catalyst is prepared. The prepared catalyst can well improve the conversion rate of toluenediamine, inhibit side reactions, improve the anti-coking capability, reduce the generation of carbon deposits, prevent the agglomeration of catalyst particles, prolong the service life, improve the mechanical strength and thermal stability, reduce the activation energy in the synthesis process of diethyltoluenediamine, make the reaction conditions milder, make the yield higher, and reduce the production cost. And the method can be repeatedly used and has a wide application prospect.

The application discloses a cold storage and heat preservation plastic foam and a preparation method thereof. The combined material formula comprises a boric acid polyether polyol and a high-hydroxyl-value o-toluidine polyether polyol. The boric acid polyether polyol has a characteristic of a triangular stable structure of boron atoms, and can improve the strength and dimensional stability of a plastic product and delay the attenuation of the strength and dimensional stability of the plastic product in application. The boric acid polyether polyol contains a part of insoluble B=O structure, which is easy to precipitate in the early stage of the reaction of the combined material with isocyanate, forms stable nucleation points, and through the synergistic effect of the high-hydroxyl-value o-toluidine polyether polyol, the cross-linking of product foam fibers is enhanced, the bubbles are inhibited and the bubbles are made more delicate, and the thermal conductivity of the product is reduced. The rapid cross-linking can reduce the volatilization of a foaming agent and reduce the surface bubbles at the end of product flow.

The invention belongs to the technical field of product purification and organic synthesis, and particularly relates to an m-toluenediamine composition, a purification method of m-toluenediamine and application of m-toluenediamine. Through repeated research, the applicant finds that m-toluenediamine, 4-methyl-5-amino-1-cyclohexene-1-formaldehyde and 4-methyl-5-amino-2-cyclohexene-1-ketone can be subjected to a Schiff base reaction under the catalytic action to generate Schiff base tar, and then m-toluenediamine and 4-methyl-5-amino-2-cyclohexene-1-ketone are removed from m-toluenediamine in the form of heavy components; the contents are respectively reduced to below 50ppm; the purified m-toluenediamine is used for preparing crude TDI, the purity of the TDI product obtained through rectification and purification can reach 99.99 wt% or above, and the content of chlorine-containing impurities such as hydrolyzed chlorine is lower than 5 ppm. The polyurethane flexible foam prepared by adopting the TDI provided by the invention has the advantages that the foam hole structure is fine and smooth, the comfort level of a user is obviously improved, and the content of free monomers and volatile VOCs (Volatile Organic Compounds) is obviously reduced.

The invention relates to high-temperature-resistant premixed polyether polyol and a preparation method thereof, and belongs to the technical field of premixed polyether polyol. The high-temperature-resistant combined polyether is prepared from the following raw materials in parts by weight: 60-78 parts of a polyether polyol composition, 3-5 parts of a dispersing agent, 2-4 parts of a chain extender, 0.1-0.2 part of a catalyst, 1-1.5 parts of a composite antioxidant, 0.5-1 part of a high-temperature-resistant organic silicon surfactant, 10-15 parts of a cyclopentane foaming agent and 1-2 parts of an organic phosphonate stabilizer. Composite nanoparticles prepared by matching nano ZrO2, nano Al2O3 and nano SiO2 with a composite coupling agent in a specific proportion are matched with m-toluenediamine polyether and THEIC-based heterocyclic polyether, so that the high-temperature resistance of the polyether is improved, and by virtue of a synergistic system formed by the nanoparticles of the three components, m-toluenediamine polyether and THEIC-based heterocyclic polyether, the high-temperature resistance of the polyether is improved. The problems that traditional combined polyether is easy to decompose at high temperature, easy to retract and poor in stability are solved.

The invention relates to the field of membrane separation, in particular to a method for improving the molecular weight of dimethyl thio toluenediamine-based polyimide through partial crosslinking. According to the preparation method, pyromellitic chloride (BTC) is taken as a cross-linking agent, copolymerized polyamide acid formed by 4, 4 '-(hexafluoroisopropenyl) diphthalic anhydride (6FDA), dimethyl thio toluenediamine (DMTDA) and common diamine (MPD / PPDA) is taken as a cross-linking unit, and polyimide with a partial cross-linking structure is prepared through low-temperature solution polycondensation and chemical imidization processes. The molecular weight and branching degree of the polymer are effectively controlled by regulating the introduction amount (0-4%) of pyromellitic dichloride. The process is simple, reaction conditions are mild, raw materials are easy to obtain, and the obtained partially-crosslinked polyimide film has high molecular weight, good free volume and excellent gas permeation selectivity and is expected to be applied to the field of gas separation films on a large scale.

The invention is directed to an improved process for producing at least one thioether-substituted, preferably thioalkylated, aromatic diamine X. Thioether-substituted aromatic diamines are aromatic diamines with at least one thioether group bound to the aromatic ring via the sulfur atom. They are of particular interest for use as curing agents. Preferred thioether-substituted aromatic diamines are monomethylthiotoluene diamine ("MMTDA") and dimethylthiotoluene diamine ("DMTDA"). In the process according to the invention, an aromatic diamine A is reacted with at least one organic disulfide B in the presence of at least one Lewis-acid catalyst D and at least one polyol E. A and E are obtained by depolymerization of at least one polyurethane PU. Preferably, the organic phase, comprising A, of the depolymerization raw product RP is employed in the reaction of the aromatic diamine with the organic disulfide B. The yield of mono- versus di-thioether substituted aromatic diamines may advantageously be controlled by drying the employed organic phase.

Disclosed are wash resistant compositions for altering the tone or color of the hair, the compositions comprising a hair coloring agent comprising an oxidation base chosen from toluene-2,5-diamine, acid salts thereof, or solvates thereof, and a coupler system comprising at least one coupler chosen from 1-napthol, 2-amino-4-hydroxyethylaminoanisole sulfate, and derivatives thereof, addition salts thereof, solvates thereof, or solvates of salts thereof; or mixtures thereof, as well as methods of using the compositions.

Provided is a paint composition including an isocyanate component, an amine component, and a refractory agent, the isocyanate component including an aliphatic polyisocyanate, the amine component including at least one polyamine (a) selected from the group consisting of a dimethylthiotoluenediamine, a diaminodiphenylmethane, and an aspartic ester amine.

This invention belongs to the field of polyether polyol preparation technology, specifically relating to an ultra-low thermal conductivity, high-performance flame-retardant polyether polyol for home appliances, its preparation method, and its application. The preparation method is as follows: (1) reacting hexamethylol melamine with methanol to obtain a partially etherified melamine resin containing water and mainly tetraetherified; (2) using the product of step (1) and o-toluenediamine as a mixing initiator, reacting with some epoxy alkane and then dehydrating; (3) heating and adding the remaining epoxy alkane for reaction; (4) adding low thermal conductivity microcapsules and stirring to disperse, the amount added being 2-5% of the total mass of the polyether system. This invention achieves ultra-low thermal conductivity through a dual technical path of "crosslinking structure optimization + microcapsule composite" while taking into account both high efficiency flame retardancy and excellent mechanical properties, meeting the requirements of new energy efficiency and safety standards for home appliances. This invention also provides its preparation method and its application in rigid polyurethane foam components for home appliances.

The invention discloses a waste gas condensation and recovery device for diethyl toluenediamine production, and particularly relates to the technical field of diethyl toluenediamine production, the waste gas condensation and recovery device comprises a condensation cavity, two gas pipes both extend into the condensation cavity, a cleaning mechanism is arranged in the condensation cavity, and the cleaning mechanism comprises a plurality of rotating cylinders arranged on a rotating shaft; the diameters of the multiple rotary drums are gradually increased in the flowing direction of waste gas, scraping plates and grinding wheels are arranged on the rotary drums, the scraping plates are arranged in front of the grinding wheels in the rotating direction of the rotary drums, and the rotary drums and the grinding wheels abut against the inner wall of the inner drum. According to the invention, by arranging the plurality of rotary drums of which the diameters are gradually changed along the flowing direction of the waste gas, the situation that the waste gas is depressurized and decelerated along with condensation is effectively avoided, and the waste gas can continuously flow in the condensation cavity in a state of impacting the condensation wall at high frequency, so that the condensation effect of the waste gas is effectively guaranteed; the DETDA gas in the waste gas can be fully condensed and recycled.

A first aspect of the invention relates to a purification process for obtaining vicinal toluenediamine. In a second aspect, the invention is directed to vicinal TDA (vTDA) obtained or obtainable from a process of the first aspect of the invention, comprising less than 100 weight-ppm of a toluidine compound of formula (I). A third aspect of the invention is related to vicinal TDA (vTDA) having a purity in the range of at least 99 weight- % and comprising less than 100 weight-ppm of a toluidine compound of formula (I).

The invention is directed to an improved process for producing at least one thioether-substituted, preferably thioalkylated, aromatic diamine X. Thioether-substituted aromatic diamines are aromatic diamines with at least one thioether group bound to the aromatic ring via the sulfur atom. They are of particular interest for use as curing agents. Preferred thioether-substituted aromatic diamines are monomethylthiotoluene diamine ("MMTDA") and dimethylthiotoluene diamine ("DMTDA"). In the process according to the invention, an aromatic diamine A is reacted with at least one organic disulfide B in the presence of at least one Lewis-acid catalyst D and at least one polyol E. A and E are obtained by depolymerization of at least one polyurethane PU. Preferably, the organic phase, comprising A, of the depolymerization raw product RP is employed in the reaction of the aromatic diamine with the organic disulfide B. The yield of mono- versus di-thioether substituted aromatic diamines may advantageously be controlled by drying the employed organic phase.

A first aspect of the invention relates to a mixture comprising 2,4-toluene diamine and 2,6-toluene diamine and comprising less than 10 weight-ppm of a methyl cyclohexanol compound of formula (I based on the total weight of the mixture being 100 weight-%. In a second aspect, the invention is directed to a method for controlling a hydrogenation process for preparing toluene diamine (TDA) from dinitrotoluene (DNT), said TDA having a boiling temperature range BTRTDA with a lower boiling temperature limit value TTDA(L) and an upper boiling temperature limit value TTDA(U). A third aspect relates to a mixture comprising at least 2,4-toluene diamine and 2,6-toluene diamine obtained or obtainable from the method according to the second aspect of the invention. A fourth aspect of the invention is directed to a use of the mixture according to the first aspect of the invention or of the mixture of the third aspect of the invention for the preparation of toluene diisocyanate (TDI). In a fifth aspect, the invention relates to a process for preparing toluene diisocyanate (TDI) comprising: (I) Providing a mixture according to the first aspect of the invention or of the mixture according to the third aspect of the invention; and (II) Phosgenation of the mixture provided in (I), thereby obtaining TDI.

The present invention relates to a method for preparing toluene-2,5-diamine or a salt thereof. The present invention further relates to a method for preparing a toluene-2,5-diamine sulfate. The method avoids the use of carcinogenic and allergenic raw materials (such as o-toluidine), utilizes a brand-new synthesis route, and has the advantages whereby starting raw materials are easily available, the reaction environment is safe, the operation is simple, the intermediate is stable and the separation is simple, prohibited components (such as o-toluidine) are not used nor generated, etc.

The application provides a method for treating toluene diamine tar and recycling toluene diamine. The method comprises the following steps: mixing toluene diamine tar with water, and then heating to enter a flash evaporator; after flash evaporation, condensing the top gas phase into high-temperature water for S3 scraper separator bottom high-concentration tar transportation, and the bottom liquid phase enters the scraper separator; the toluene diamine and water mixture taken from the top of the scraper separator is sent to a toluene diamine dehydration system for further refining, and the high-concentration tar taken from the bottom is mixed with the high-temperature water condensed from the S2 gas phase in a tar tank and then sent out. In the process of treating toluene diamine tar, the method has more moderate process conditions, high toluene diamine recovery rate, and is suitable for continuous industrial production operation.

The invention discloses velvet color-changing Yangbuck leather and a preparation method thereof, and belongs to the technical field of artificial leather. The method is used for solving the technical problems that in the prior art, the Yangbuck leather preparation process is complex and tedious, on the premise that excellent mechanical strength of Yangbuck leather is kept, the Yangbuck leather has the fluff touch feeling and high temperature resistance, and the attractiveness is improved by increasing the color changing effect. The preparation method of the velvet color-changing Yangbuck leather comprises the following steps: S1, foaming a mixture to obtain a semi-finished product of the Yangbuck leather; performing ultraviolet radiation on the semi-finished Yangbuck to form a semi-finished modified Yangbuck; and S2, the surface of the modified Yangbuck semi-finished product is coated with the coating composition in a blade coating mode, a film layer is formed, and the prepared velvet color-changing Yangbuck is obtained. Wherein when the high-temperature-resistant discoloration polyurethane is prepared, a polymerization chain extender is added as a reinforcing agent, and spirophora is added as a color assisting agent; wherein the polymerization chain extender is obtained by carrying out polymerization reaction on pyromellitic dianhydride and 3, 5-diethyl-2, 4-toluenediamine.

The invention discloses a method for preparing toluene diisocynate by utilizing phosgene, and belongs to the technical field of toluene diisocynate preparation.The preparation method comprises the following steps that a Pd-Co3O4 / C catalyst is taken and heated to 140-150 DEG C, dinitrotoluene and activated hydrogen with the molar ratio being 1: (6.2-6.4) are added into the catalyst in a countercurrent mode, after the reaction is completed, cooling and gas-liquid separation are conducted, and the toluene diisocynate is obtained. The method comprises the following steps: adding m-toluenediamine into a first-stage distillation tower, collecting a liquid component, carrying out reduced pressure distillation, collecting a component which is not evaporated, sequentially introducing the component which is not evaporated into the first-stage distillation tower and a second-stage distillation tower, and separating m-toluenediamine; taking m-toluenediamine, introducing phosgene, reacting at room temperature for 2-3 hours, heating to 145-160 DEG C after the reaction is finished, stirring at constant temperature until the reaction is complete, collecting a product, and carrying out reduced pressure distillation to obtain the toluene diisocynate. Through detection, the purity of the toluene diisocynate prepared by the method provided by the invention reaches 99.7%-99.8%.

This invention belongs to the field of polyether polyol technology, specifically relating to low-viscosity aniline polyether polyol, its preparation method, and its application. The low-viscosity aniline polyether polyol has a viscosity below 10000 mPa·s, and its raw material components include 5-15 parts of o-toluene diamine, 10-35 parts of aniline compound, 0.05-0.3 parts of alkali metal catalyst, and 30-70 parts of epoxide alkane. The resulting low-viscosity aniline polyether polyol has even lower viscosity, resulting in better operability and applicability in product applications, and exhibits excellent thermal conductivity in the preparation of rigid polyurethane foam products. The preparation method is simple and convenient. The application of the low-viscosity aniline polyether polyol is in the preparation of rigid polyurethane foam.

The invention belongs to the technical field of polyether polyol preparation, and particularly relates to ultra-low heat-conducting high-performance flame-retardant polyether polyol for household appliances as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) reacting hexamethylol melamine with methanol to obtain moisture-containing partially etherified melamine resin mainly comprising tetra-etherification; (2) taking the product in the step (1) and o-toluenediamine as a mixed initiator, reacting with part of alkylene oxide, and dehydrating; (3) raising the temperature, and adding the residual alkylene oxide for reaction; and (4) adding low-heat-conductivity microcapsules, stirring and dispersing, wherein the addition amount is 2-5% of the total mass of the polyether system. The ultra-low heat-conducting property is realized through a double technical path of cross-linked structure optimization and microcapsule compounding, efficient flame retardance and excellent mechanical property are considered at the same time, the new energy efficiency and safety standard requirements of household appliances are met, and the invention further provides a preparation method of the ultra-low heat-conducting material and application of the ultra-low heat-conducting material in rigid polyurethane foam parts for household appliances.