798 results about "Diphenylmethane" patented technology

Reactive polyurethanes containing free isocyanate groups but low levels of monomeric asymmetrical diisocyanate may be obtained by reacting a monomeric asymmetrical diisocyanate such as diphenylmethane-2,4'-diisocyanate (2,4'-MDI) containing less than 5% 4,4'-MDI and 2,2'-MDI, the 2,2'-MDI content being under 0.4%, with a polyhydric alcohol such as a diol with a molecular weight of 60 g/mol to 2,000 g/mol. The ratio of isocyanate groups to hydroxyl groups may be a value of 1.05:1 to 2.0:1. The reactive polyurethanes can be used to produce one- and two-component adhesive and sealant products.

The invention relates to a composition containing, in a physiologically acceptable medium, (a) at least one hydroxylated diphenylmethane compound of formula (I)

where formula variables are defined in the body of the application and claims and (b) at least one ingredient promoting the solubilization, stabilization and/or activity of the hydroxylated diphenylmethane compound of formula (I). The invention also relates to a cosmetic method for caring for or making up the skin, comprising the topical application of such a composition to the skin.

The invention discloses a preparing technology of polyurethane modified ethoxyline resin adapted for composite wear-resistant coating material. Polyether dihydroxy alcohol having a degree of functionality of 2 and an average relative molecular weight of 1200 to 2200 is reacted with toluene di-isocyanate or diphenylmethane-4,4'-diisocyanate prepared for preheating to synthetize polyether dihydroxy alcohol polyurethane performed polymer for reservation; one of bisphenol A E-44 and E-51 after pre-dehydration is selected for reservation; polyurethane modified epoxy is formed through polyaddition reaction in which a mass ratio of polyether dihydroxy alcohol polyurethane performed polymer to epoxide resin is 15 to 70: 100. The polyurethane modified epoxy obtained by the technology has high bonding strength, good flexibility and shock resistance with basal bodies of spare parts, totally without using plasticizers, such as dibutyl phthalate, dioctylphthalate, etc., without using or using less plasticizers, such as polysulfide rubber, liquid acrylonitrile butadiene rubber, etc., thereby not only solving the problem that general epoxide resin has bad flexibility but also saving the production cost.

The invention provides an engineering plastic with high wearing resistance. The engineering plastic is made from the following raw materials by weight: 80-100 parts of polyformaldehyde, 20-40 parts of polyamide, 20-50 parts of polycarbonate, 25-40 parts of acrylonitrile-butadiene-styrene copolymer, 10-30 parts of epoxy resin, 12-20 parts of polytrimethylene terephthalate, 1-5 parts of diphenylmethane bismaleimide, 10-15 parts of polyphenyl ether, 20-40 parts of polyether-ether-ketone, 10-20 parts of polytetrafluoroethylene, 5-10 parts of melamine, 4-12 parts of boric acid alkanolamide, 2-6 parts of polyethylene glycol, 4-12 parts of phenolic ether phosphomonoester, 5-15 parts of polymethyl methacrylate, 10-20 parts of organic silicone oil, 5-10 parts of silane coupling agent, 3-5 parts of zinc stearate, 10-20 parts of glass fibre, 12-20 parts of graphite, 5-10 parts of silicon carbide whisker, 5-8 parts of nanometre titanium oxide, 4-6 parts of diphenyl ketone, 3-8 parts of butylated hydroxyanisole and 15-30 parts of filler. The engineering plastic provided by the invention has a good wear-resisting property.

This invention discloses a method for preparing 4, 4'-diamino dicyclohexylmethane (H12MDA) from 4, 4'-diamino diphenylmethane (MDA) via hydrogenation catalyzed by supported nanoscale Ru catalyst. The method comprises: performing stereoselective hydrogenation on MDA at 100-180 deg.C and 4-10 MPa in an intermittent autoclave for 1-9 h to obtain H12MDA. The MDA conversion rate is near 100%, the H12MDA weight yield is near 100%, and the trans-H12MDA content is below 25%. After the supported nanoscale Ru catalyst is continuously reused for above 30 times without supplementation, the MDA conversion rate is still near 100%, and the trans-H12MDA content is below 27%.

An insulated electric power cable having an insulator layer formed by extrusion-coating and cross-linking a cross-linkable resin composition, which contains a polyolefin blended with a total of 0.05 to 0.4 parts by mass of at least one compound selected from the group of compounds such as N,N'-(4,4'-diphenylmethane)bismaleimide, based on 100 parts by mass of the polyolefin, and a prescribed amount of an organic peroxide cross-linking agent.

Compounds having a diphenylmethane skeleton are superior in broad utility and stability, and are useful as a protecting reagent (anchor) of amino acid and/or peptide in the liquid phase synthesis and the like of a peptide having a C-terminal etc., which are of a carboxamide(-CONHR)-type, and in organic synthetic reaction methods (particularly peptide liquid phase synthetic methods), and may be contained in a kit for peptide liquid phase synthesis.

The invention discloses an aging-resistant and low-temperature-resistant EPDM (ethylene-propylene-diene monomer) rubber cable material. The material comprises raw materials as follows: EPDM rubber, natural rubber, an ethylene-butene elastomer, superfine talc powder, nano calcium carbonate, modified superfine desulfurization ash, active calcium silicate, zinc methacrylate modified nano silicon nitride, pre-dispersed hollow phenolic microspheres, reinforcing fibers, zinc oxide, stearic acid, dicumyl peroxide, sulfur, N,N'-meta phenylene bismaleimide, diphenylmethane bismaleimide, DIPDIS, coumarone-indene resin, APP (ammonium polyphosphate), ADP, an MPE (metallocene polyethylene) elastomer, N-(4-anilino phenyl maleimide and 2-mercapto benzimidazole. The aging-resistant and low-temperature-resistant EPDM rubber cable material is high in strength, good in aging resistance and low-temperature resistance, excellent in insulating property and flame retardation and long in service life.

The invention discloses a reversible repair functional matrix resin for pultrusion and a preparation method of the matrix resin. The matrix resin is prepared from the following raw materials in parts by weight: 30-60 parts of 4,4'-diallylbisphenol A diglycidyl ether epoxy resin, 20-35 parts of furfuryl amine, 15-30 parts of 4,4'-bismaleimide diphenylmethane, 0-25 parts of liquid epoxy resin and 5-15 parts of curing agent. The preparation method comprises the following steps: dissolving the 4,4'-diallylbisphenol A diglycidyl ether epoxy resin in a formula amount into a solvent, slowly adding the furfuryl amine into a reaction container for reacting, adding the 4,4'-bismaleimide diphenylmethane, liquid epoxy resin and curing agent, reacting and mixing for a hour, performing reduced pressure distillation to remove the solvent, and cooling. The reversible repair functional matrix resin for pultrusion and the preparation method of the matrix resin disclosed by the invention have the beneficial effects that the matrix resin has good molding manufacturability, the molecular structure contains furan and imide structures, the heating and repairing functions of the prepared composite material can be realized by virtue of a Diels-Alder reversible reaction, and the matrix resin also has the advantages of high strength and high heat resistance.

The invention provides a process for the preparation of polyamines of the diphenylmethane series. This process comprises a) reacting aniline and formaldehyde in a molar ratio of 1.5:1 to 6:1, in the presence of an acid catalyst at temperatures of 20° C. to 100° C., in which the water content in the acid reaction mixture is <20 wt. % and a degree of protonation of <15% is established, and b) increasing the temperature of the reaction to a temperature of 110° C. to 250° C. when the ratio of the weight contents of p-aminobenzylaniline to 4,4′-MDA in the reaction mixture falls below a value of 1.00.

The invention discloses a catalytic synthesizing technique of 4, 4'-diamino diphenylmethane, which comprises the following steps: adopting phenylamine and formaldehyde as raw material to do one-step condensed reaction intervally acted by solid acid catalyst; setting the molar rate of phenylamine and formaldehyde at 10/1-2/1 under 100-200 deg.c for 1-8h; circulating diamino diphenylmethane; recycling USY to synthesize the product with high activity.

The invention relates to the chemical field and particularly relates to a novel synthesis method for preparing a key intermediate 5-bromine-2-chlorine-4'-ethyoxyl diphenylmethane of a drug dapagliflozin for treating diabetes mellitus II. The preparation method comprises the following steps: enabling a starting raw material ortho-toluidine to firstly perform bromization and then perform chlorination after diazotization on a benzene ring with N-bromo-succinimide; then, in the presence of a halogenating agent, performing halogenating reaction of beta-position; and finally, performing Friedel-Crafts alkylation synthesis with phenetole, thereby obtaining the key intermediate. The preparation method is simple and convenient, economical and relatively high in reaction yield in each step, and suitable for industrial production.

The present invention relates to a process for the preparation of CFC-free, flexible polyurethane (molded) foams by reacting A) liquid polyisocyanate mixtures containing bonded urethane groups having a content of NCO groups of from 22 to 30% by weight which are themselves prepared by reacting a mixture of diphenylmethane diisocyanates and polyphenyl-polymethylene polyisocyanates having a content of diphenylmethane diisocyanate isomers of from 55 to 99% by weight, based on the total weight, with at least one trifunctional polyoxypropylene-polyol having a hydroxyl number of from 20 to 60, with B) relatively high-molecular-weight polyhydroxyl compounds and, if desired, C) low-molecular-weight chain extenders and/or crosslinking agents, in the presence of D) blowing agents, E) catalysts and, if desired, F) auxiliaries and/or additives, and to the polyisocyanate mixtures (A) modified by means of urethane groups which can be used according to the invention.

The present invention relates to a process for the production of 4,4′-diphenylmethane diisocyanate (4,4′-MDI) by acid-catalyzed condensation of aniline with formaldehyde, reaction of the mixtures of di- and polyamines obtained with phosgene to form the corresponding mixture of MDI isomers and homologues (di- and polyisocyanates of the diphenylmethane series) and subsequent separation of the mixture by distillation to form 4,4′-MDI and polymeric MDI.

An application of the bromophenol compounds chosen from bis-(2,3-bibromo-4,5- dihydroxybenzyl)-ether, 2,2',3,3'-tetrabromo-4,4',5,5'-tetrahydroxydiphenyl methane, 2,2',3- tribromo-3',4,4',5-tetrahydroxy-6'-ethoxymethyl diphenylmethane, 3-bromo-4,5-bis-(2,3-dibromo -4,5-dihydroxybenzyl)-catechol, their pharmacologically acceptable derivatives, and their mixture in preparing the depressant of protein tyrosine phosphatase for treating diabetes and obesity is disclosed.

The invention relates to a hyperbranched polysiloxane grafted graphene/bismaleimide composite material and a preparation method thereof. The composite material is prepared by casting for forming and comprises 0.1-10 weight parts of graphene modified by hyperbranched polysiloxane, 100 weight parts of diphenylmethane bismaleimide and 10-100 weight parts of bisphenol A diene propyl ether, wherein for further raising the dispersibility of graphene in resins and the interface bonding strength between the graphene and resins, the graphene is modified by conducting silicon-hydrogen addition polymerization; according to the bisphenol A diene propyl ether included in the resins, the prepolymer has low viscosity in a wide temperature range, thus the dispersibility of graphene in benefited; the bisphenol A diene propyl ether can be rearranged into 2,2'-diallyl bisphenol A at a high temperature to react with the diphenylmethane bismaleimide, thus the strength of the resins is guaranteed. The prepared composite material has good mechanical properties and excellent friction properties, and can be used as slide plates of non-lubricated water pumps or dynamic seal coatings of engines, etc.

The present invention relates to a process for the preparation of di- and polyamines of the diphenylmethane series, and to the preparation of di- and polyisocyanates of the diphenylmethane series from these di- and poly-amines. The di- and poly-amines of the diphenylmethane series are prepared by the reaction of aniline and formaldehyde in the presence of hydrochloric acid. In with the present invention, the hydrochloric acid employed contains less than 0.001 wt. % of metal ions which are divalent and/or more than divalent.

The invention discloses a hydrogenation catalyst and a preparation method of 4,4'-diamino-dicyclohexyl methane. The hydrogenation catalyst comprises a carrier used as mesoporous carbon and an active component used as ruthenium, wherein the load capacity of the active component is 0.5-10 percent by mass of the hydrogenation catalyst. in the preparation method of low transisomer 4,4'-diamino-dicyclohexyl methane, the catalyst of the invention is adopted to selectively hydrogenate and generate a target product under the conditions of solvents and hydrogenation. In the invention, the catalyst and the method reduce the generation of byproducts while the higher conversion ratio of the 4,4'-diamino-diphenylmethane is remained, and decrease the content of the transisomer of the 4,4'-diamino-dicyclohexyl methane. Meanwhile, the catalyst is low in cost and simple and convenient in preparation and is suitable for industrial application.

The invention discloses a preparation method of polyurethane foam materials based on liquefied lignin calcium sulfonate polyalcohol. The preparation method is characterized in that through being metered in parts by weight, 100 parts of polyether polyol is added into a reaction kettle, 5 to 100 parts of lignin calcium sulfonate is added, the reaction lasts 1 to 5 hours at the temperature being 150 to 190 DEG C and the pressure being 1 to 3 MPa, and liquefied lignin polyalcohol is obtained; 100 parts of liquefied lignin polyalcohol is respectively mixed and stirred with 2.5 to 5 parts of foaming agent water, 0.8 to 1.2 parts of foam stabilizers, 0.2 to 0.6 part of triethylene diamine, then, 0.3 to 0.5 part of stannous octoate is added, the stirring is carried out, and ingredients A are obtained; and crude diphenylmethane-4,4'-diisocyanate is taken as ingredients B, the ingredients A and the ingredients B are mixed according to a weight ratio being (0.95-1.1):1 and take reaction for foaming and curing by a high-pressure foaming machine, and the polyurethane foam materials are prepared. The preparation method has the advantages that the process is simple, green and clean effects are realized, and good market prospects are realized.

The invention relates to a preparation method of antibacterial polyurethane, which belongs to the technical field of manufacture of organic polymer materials with antibacterial function. The preparation method comprises the pre-polymerization reaction, the chain extension reaction and the termination reaction, diphenylmethane-4,4'-diisocyanate and polytetrahydrofuran are taken as basic raw materials, and the preparation method is characterized by adding 500-10000ppm of quaternary ammonium salt with antibacterial activity in the pre-polymerization reaction stage. The preparation method has the advantages of wide sources of the raw materials, easy control of reaction conditions and low cost, and the produced antibacterial polyurethane has the advantages of good antibacterial effect and long-term keeping of the antibacterial activity.