58 results about "Mannich condensation" patented technology

The invention provides a compound modified aliphatic amine curing agent, which is liquid state at normal temperature, has low viscosity and proper curing speed, can improve the toughness of a cured substance and reduce the reduction of the strength, and can regulate the proportion of compound modification according to the purpose of the cured substance. The curing agent is prepared by phenol, aldehyde and amine through mannich condensation reaction, wherein the molar ratio of the phenol, the aldehyde and the amine is 1: (0.8-1.0): (0.8-1.0). The preparation technology is as follows: 1. uniformly mixing the phenol and the amine according to certain molar ratio in a flask through stirring, and heating up to 50-85DEG C; 2. adding paraformaldehyde of corresponding molar into the flask by 5-6 times in 0.5-1 hour, wherein the temperature is 50-85DEG C; 3. reacting the mixed liquor for 2-5 hours at 60-100DEG C; and 4. carrying out reduced-pressure distillation at the temperature of 70-100DEG C and the pressure of 0.0013-0.0313MPa to remove water in the product and collecting the product.

The invention relates to a novel accelerant and a novel curing agent, a preparation method and an application thereof. The preparation method of the novel accelerant comprises: providing at least natural cardanol or artificial cardanol compound which has a chemical structural formula as shown in a formula VIII, wherein R is C15H2X+1, X is an integer between 12 and 15, and Z is H or OH; providing an aldehydes compound; providing an alkyl amine compound which has secondary amine; mixing the cardanol compound, the aldehydes compound and the alkyl amine compound, heating, and performing a mannich condensation reaction to form the accelerant. The invention further relates to the novel accelerant and the novel curing agent.

New, highly effective Mannich detergents for use in hydrocarbon fuels are described which reduce engine deposits in spark and compression ignition internal combustion engines. They are Mannich condensation reaction products obtained from reacting: (i) a polyamine having a sterically-hindered primary amino group, (ii) a hydrocarbyl-substituted hydroxyaromatic compound, and (iii) an aldehyde. These Mannich detergent compounds may be dispersed in a liquid carrier to provide a fuel additive concentrate for hydrocarbon engine fuels which effectively control engine deposit formation in intake valves and also other engine regions such as port fuel injectors and combustion chambers.

The invention provides N-full-aromatic hydrocarbon diamine-bisphenol tetrafunctional fluorenyl benzoxazine and a preparation method thereof. The method comprises the following steps: firstly, protecting amino in 2,7-diamino-9,9-bis-(4-hydroxyphenyl) fluorene by using trifluoroacetic anhydride to generate 2,7-bistrifluoroacetamido-9,9-bis(4-hydroxyphenyl) fluorene, and then carrying out Mannich condensation reaction with aromatic amine and paraformaldehyde to form a 2,7-bistrifluoroacetamido bisphenol fluorenyl benzoxazine monomer; carrying out amino deprotection, and then carrying out secondary Mannich condensation reaction with a phenolic compound and paraformaldehyde to finally obtain a novel N-full-aromatic hydrocarbon diamine-bisphenol tetrafunctional fluorenyl benzoxazine monomer. By adopting the N-full-aromatic hydrocarbon diamine-bisphenol tetrafunctional fluorenyl benzoxazine and the preparation method thereof, the problems that the fluorenyl polybenzoxazine with a large steric hindrance structure is small in molecular weight, low in crosslinking density and poor in tenacity, and the thermal performance is reduced by introducing a flexible group are solved, the processing property of the polymer is improved, and controllable structure and performance of polybenzoxazine are achieved.

The present invention is directed to Mannich condensation product sequestering agents or mixtures of Mannich condensation product sequestering agents for use in fuels and lubricating oils. The present invention is also directed to a process for preparing the Mannich condensation product sequestering agents. The present invention is also directed to a product formed by combining, under reaction conditions, a polyisobutyl-substituted hydroxyaromatic compound, an aldehyde, an amino acid or ester thereof, and an alkali metal base to form the Mannich condensation product sequestering agent. The present invention is also directed to a lubricating oil composition, a lubricating oil concentrate, a fuel composition, and a fuel concentrate having the Mannich condensation product sequestering agents of the present invention.

A water-soluble composition including a water soluble polyamine adduct which is a reaction product of: (a) an alkoxy group modified polyepoxide resin containing an average of at least 1.5 epoxide groups per molecule; and (b) a Mannich base polyamine. The Mannich base polyamine is a reaction product of a polyamine containing at least two amino groups with a N-Mannich condensate prepared from a reaction of a phenolic compound, an aldehyde, and a secondary amine wherein the secondary amine of the N-Mannich condensate is replaced by one of the at least two amino groups of the polyamine, and wherein the ratio of the Mannich base polyamine to the alkoxy group modified polyepoxide resin contains an excess of an active amine hydrogen relative to epoxide groups so that the water soluble polyamine adduct has an amine hydrogen equivalent weight of at most 1000 based on solids content.

The invention provides an oil and gas field acidification high-temperature corrosion inhibitor which is composed of the components of, by mass, 30-50% of an aldehyde ketone amine condensate, 2-5% of a corrosion inhibition synergist, 5-10% of a high-temperature synergist, and balance of an alcoholic organic solvent. A preparation method of the aldehyde ketone amine condensate comprises the following step: under the effect of an acidic catalyst, aldehyde, ketone and amine are subjected to a Mannich condensation reaction, such that the aldehyde ketone amine condensate is obtained. According to the invention, the aldehyde ketone amine condensate is adopted as a main component, and is compounded with the corrosion inhibition synergist and the high-temperature synergist, such that the corrosion inhibitor is obtained. The aldehyde ketone amine condensate has the advantages of good acid solubility, low corrosion rate, low product viscosity, no irritating odor, no low-temperature (-20 DEG C) crystallization, convenient on-site application, and the like. The high-temperature corrosion inhibitor provided by the invention can be used in acidification works of high-temperature stratums with high-concentration hydrochloric acid and mud acid.

The invention belongs to the technical field of heat convertible resins and preparation thereof, and discloses a norbornene group capping benzoxazine oligomer and a preparation method thereof. The preparation method comprises the concrete steps of carrying out condensation reaction on 2-aminophenol and carbic anhydride to prepare norbornene functionalized phenol containing a carbon-carbon double bond, and utilizing the norbornene functionalized phenol containing the carbon-carbon double bond as a capping group of the benzoxazine oligomer; utilizing the norbornene functionalized phenol containing the carbon-carbon double bond, bisphenol, diphenacylamine and paraformaldehyde to be subjected to Mannich condensation reaction in an organic solvent; preparing high-performance thermosetting resin through the benzoxazine oligomer. Compared with the prior art, the norbornene group capping benzoxazine oligomer and the preparation method thereof provided by the invention has the advantage that the cross-linkable capping group is introduced through ortho-position benzoxazine chemical so as to prepare the benzoxazine oligomer. The ortho-position benzoxazine chemical is utilized to enable a benzoxazine synthesis process to be simplified, the introduced cross-linkable capping group fills a performance gap of the benzoxazine oligomer caused by low molecular weight, and the machinability of abenzoxazine resin is improved.

The present invention is directed to a low sulfur, low sulfated ash and low phosphorus lubricating oil composition for low emission heavy duty diesel engines comprising (a) a major amount of an oil of lubricating viscosity and (b) at least 5 weight percent of an anti-wear additive composition comprising a metal salt of a Mannich condensation product based on the total weight of the lubricating oil. The present invention is also directed to a low sulfur, low sulfated ash and low phosphorus lubricating oil concentrate comprising (a) an oil of lubricating viscosity and (b) at least 5 weight percent of an anti-wear additive composition comprising a metal salt of a Mannich condensation product based on the total weight of the lubricating oil.

A PIB derivative suitable for use as a fuel additive or lubricant additive prepared from a reactive low molecular weight polyisobutylene composition comprising at least 50 mol percent alpha vinylidene terminated polyisobutylene molecules, the composition having a polydispersity of no more than 1.5 and a number average molecular weight of at least 500 Daltons and no more than 1000 Daltons. The derivative is selected from the group consisting of: alkyl hydroxyaromatic compounds; alkyl alkoxy aromatic compounds; polyisobutenylsuccinic anhydrides; polyisobutenylsuccinimides; PIB-amine compounds; sulfurized PIB compounds; and Mannich condensation products of an alkylated hydroxyaromatic compound.

The invention relates to a carbon 2-bit substituted cephalosporin derivative as well as a synthetic method and application thereof. The synthetic method comprises the following steps: carrying out Mannich condensation by taking GCLE and derivatives thereof as raw materials to introduce double bonds and a methylation reaction, carrying out Michael addition reaction based on the Manich condensationto modify cephalosporin mother nucleus 2-bit, thereby acquiring a series of compounds. The acquired target compounds have a certain antibacterial activity to gram-positive bacteria, wherein two compounds with the form of sulphoxide in 1-bit also present stronger combination ability with beta-lactamase.

A process for producing a rigid foamed synthetic resin, which comprises reacting a polyol mixture (P) containing a polyol (A) and a polyol (B) and a polyisocyanate compound (I) in the presence of a blowing agent containing water, a catalyst, a foam stabilizer and a flame retardant. The polyol (A) is a polyether polyol having a hydroxyl value of from 56 to 250 mgKOH/g, obtainable by subjecting an alkylene oxide to ring-opening addition polymerization to a bisphenol compound. The polyol (B) is a polyether polyol having a hydroxyl value of from 100 to 800 mgKOH/g, obtainable by subjecting an alkylene oxide to ring-opening addition polymerization to a Mannich condensation product.

The invention discloses a quinoxaline diamine type polybenzoxazine foam material and a preparation method. The method includes the steps that 3-dinitrobenzil and o-phenylenediamine are used as raw materials, so that 2,3-bis(3-nitrophenyl)quinoxaline is synthesized; 2,3-bis(3-phenyl)quinoxaline is obtained through catalytic reduction, and then undergoes an Mannich condensation reaction with a phenolic compound and paraformaldehyde, so that a diamine type quinoxaline-based benzoxazine monomer is obtained; quinoxaline-based polybenzoxazine foam is obtained through temperature programming thermocuring. The diamine type benzoxazine foam which is prepared through the method and is of a quinoxaline structure has good flame resistance, heat and humidity resistance and low dielectric losses; no extra foaming agents need to be added in the polybenzoxazine foam, and the preparation method is simple; the foam material has good heat resistance and flame resistance and can be applied to various fields such as heat insulating materials, flame resistance materials and buoyancy materials.

The invention relates to a novel method for synthesizing epoxy resin accelerator (curing agent)-2, 4, 6-tri(dimethylamino methyl) phenol. 2, 4, 6-tri(dimethylamino methyl) phenol is prepared from in-situ depolymerization solution of paraformaldehyde, phenol and dimethylamine aqueous solution through Mannich condensation reaction. The method is characterized in that the phenol and the dimethylamine aqueous solution are uniformly mixed at the temperature between 0-70 DEG C, and quantitative paraformaldehyde is added within 0.5-1 hour in batches, so the mixture is enabled to react for 1-4 hours at the temperature between 30-100 DEG C; and after discharging, oil-water separation and reduced-pressure distillation, 2, 4, 6-tri(dimethylamino methyl) phenol can be obtained. The method adopts the in-situ depolymerization solution of paraformaldehyde to substitute formaldehyde aqueous solution to react, so the problems of inconvenient formaldehyde aqueous solution transportation and storage, a great deal of product wastewater after the reaction, larger energy consumption and the like in the traditional synthesizing technology are effectively solved.

The invention discloses an environment-friendly preparation method of a 4-phenylmethylene-2,6-di-tert-butyl-2,5-cyclohexadien-1-ketone derivative (p-QM). By utilizing the microwave radiation heating method under solvent-free conditions, 2,6-di-tert-butyl phenol and aromatic aldehyde are subjected to the two-step reaction of Mannich condensation and deamination to obtain the 4-benzylidene-2,6-di-tert-butyl-2,5-cyclohexadiene-1-ketone derivative (p-QM). The method has the advantages that the raw materials are cheap and easy to obtain, the atom economy is high, the reaction time is short, environment friendliness is good, dangerous reagents and solvents are not needed, the synthesis steps are simple and convenient and the like, the reaction conditions are mild, the substrate range applicability is good, and the method is simple and safe to operate and suitable for industrial production.

The invention belongs to the technical field of thermosetting resin materials and preparation thereof, and discloses a daidzein group-containing main chain type benzoxazine, and a preparation method and application method thereof. The method specifically comprises the following steps: taking daidzein as a bisphenol type phenol source compound, carrying out a Mannich condensation reaction on the daidzein with a diamine compound and paraformaldehyde to prepare daidzein group-containing main chain type benzoxazine resin, then preparing a high-performance thermosetting resin material through thermocuring of the main chain type benzoxazine resin, and processing the high-performance thermosetting resin material into a film material. Compared with the prior art, the thermosetting resin has the advantages that a bio-based daidzein structure is introduced into a benzoxazine macromolecular main chain as a repetitive unit for the first time, so that the material has good toughness and thermal performance and has the characteristic of environmental friendliness, the carbon residue rate of a cured resin material at 800 DEG C can reach 55-70%, and T<d5> is 350 DEG C or higher.

The invention discloses a method for modifying benzoxazine resin through chain extension in maleimide. The method is characterized by synthesizing a prepolymer which takes an amino group as a terminalgroup by adopting diamine for carrying out the chain extension on bismaleimide, using the prepolymer as an amine source, and carrying out Mannich condensation polymerization on the prepolymer with aphenolic compound and formaldehyde (or polyoxymethylene), thus preparing corresponding benzoxazine oligomers. The synthesized prepolymer prepared from the maleimide and the diamine contains a primaryamine terminal group, and meanwhile, a molecular structure also contains a reactive secondary amine group; on one hand, ring-opening reaction of benzoxazine can be promoted, and the curing reaction temperature can be reduced; on the other hand, the prepolymer can be used as a reactive active point and can react with epoxy resin or isocyanate, so that high performance of a polymer can be further realized.

The invention relates to an epoxy curing agent taking bark as a raw material and a preparation method thereof. The method comprises the following steps: crushing bark, adopting a 40-mesh sieve for sieving and then mixing with alkali, keeping temperature at 90 DEG C for 2-4 hours and then filtering residue, performing spray-drying treatment on the liquid and then acquiring a bark extract; performing Mannich condensation reaction on the bark extract, formaldehyde and polyamine, thereby acquiring a Mannich base curing agent; or enabling maleic anhydride to react with an epoxy compound which is prepared from the reaction of the bark extract and the epoxy chloropropane, thereby acquiring an acidic curing agent; or enabling polyamine to react with the epoxy compound which is prepared from the reaction of the bark extract and the epoxy chloropropane, thereby acquiring an amine curing agent. Natural renewable resource bark is selected as the raw material for preparing the epoxy curing agent product, the promotion of the high additional value utilization of the green renewable agriculture and forestry resources is benefited and the epoxy curing agent meets the requirements of green, environment-friendly and sustainable development.