8 results about "Toluenediamine" patented technology

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 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.

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.

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).

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.