17 results about "Toluenediamine" patented technology

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.

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.

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 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 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.

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.

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 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.

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 present invention relates to a process for recycling polyols, comprising the steps of: a) providing a mixture comprising at least one polyol and at least one impurity, wherein the at least one impurity comprises products resulting from the oxidation of toluenediamines and / or products resulting from the depolymerization of polyurethane products; and b) treating the mixture provided in step a) with a porous fine-grained solid to obtain a phase comprising polyols, wherein the phase is at least depleted of the at least one impurity or even free of the at least one impurity.

The invention discloses a damping and buffering polyurethane insole material and a preparation method thereof, and belongs to the field of polyurethane materials. According to the preparation method, a component A, a component B and a component C are prepared respectively, the component A comprises polyethylene glycol adipate, simethicone and the like, the component B comprises polyethylene glycol adipate, polyoxypropylene glycol and the like, the component C is formed by mixing dimethyl thio-toluenediamine, a functional cross-linking agent and the like, and the functional cross-linking agent is formed by mixing 3, 4, 6-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3 The preparation method comprises the following steps: introducing a hindered phenol group and a dynamic disulfide bond into the raw materials such as 1, 5-di-tert-butyl-4-hydroxybenzyl alcohol; and mixing the three components, performing injection molding, curing and demolding to obtain a finished product. Multiple weak interaction and reversible dynamic covalent bonds are constructed through the functional cross-linking agent, the damping and buffering performance, the rebound resilience and the compression fatigue resistance of the material are synergistically improved in combination with soft and hard segment proportion regulation, and the technical problems that the buffering performance and the rebound resilience of a traditional polyurethane insole are difficult to consider at the same time, and permanent deformation is likely to be generated are effectively solved.

The invention discloses a dimethyl thio toluenediamine modified epoxy resin underwater curing agent and a preparation method thereof in the field of high polymer materials. The curing agent is prepared from dimethyl thio toluenediamine, dicyclohexenyl bridged dimethyl thio toluenediamine, polyethylene glycol trimethylsilane block modified amine, cardanol, nano silicon dioxide and a silane coupling agent. The preparation method comprises the following steps: mixing two modified compounds with basic amine, adding an auxiliary agent to obtain a basic curing agent, and doping a silane coupling agent during use. The two modified compounds are prepared through a reductive amination reaction and an isocyanate addition reaction respectively, and the curing agent is endowed with excellent underwater adaptability. The curing agent can be rapidly cured with epoxy resin in a humid or underwater environment to form a high-crosslinking-density network, shows excellent adhesive force, durability and mechanical properties, and is suitable for the fields of ocean engineering, underwater structure repair and the like.