810 results about "Diphenylmethane" patented technology

A mixture of isomeric diisocyanatodiphenylmethanes composed of at least 2,2′-diisocyanato-diphenylmethane, 2,4′-diisocyanatodiphenylmethane and 4,4′-diisocyanatodiphenyl-methane is distilled in at least one stage and a divided-wall column is used in at least one distillation stage.

The invention discloses a polymide resin, a method for manufacturing the same and thin film thereof. The polyimide resin is derived from at least two dianhydrides and at least two diamines. The dianhyride is selected from a group consisting of p-phenylenebis (trimellitate anhydride), 4,4'-(hexafluoroisopropylidene)-diphthalic anhydride, and 4,4'-(4,4' -isopropylidenediphenoxy)bis(phthalic anhydride). One of the diamine monomers is 2,2' -bis(trifluoromethyl)benzidine, and the molar ratio of the 2,2'-bis(trifluoromethyl)benzidine to the diamine monomers is between 70% and 90%; and the other diamine monomers are selected from a group consisting of 4,4'-diaminobenzanilide, 4,4'-methylenedianiline, 2,2-bis[4-(4-aminophenoxy)phenyl, 4,4'-diaminodiphenyl-sulfone, 1,3-bis(4-aminophenoxy)benzene, 4,4'-oxydianiline, p-phenylenediamine, 4,4'-diamino-2,2'-dimethyl-1,1'-biphenyl and 2,2-bis[4-(4-aminophenoxy)phenyl]-1,1,1,3,3,3-hexafluoropropane.

The invention provides a process for the preparation of polyamines of the diphenylmethane series. This process comprisesa) 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, andb) 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.

A lignocellulosic composite material and a method for preparing the lignocellulosic composite material are disclosed. The composite material includes lignocellulosic particles and a binder resin being a mixture of a polyisocyanate component and a release agent. The release agent is formed from a first component having hydroxyl groups and a second component having isocyanate groups in excess of the hydroxyl groups. The first component is selected from at least one of i) an acid phosphate and ii) pyrophosphates represented by those derived from the acid phosphates (i) and mixtures of the acid phosphates (i). The first component is passivated by mixing it with the second component which is preferably monomeric diphenylmethane diisocyanate selected from at least one of diphenylmethane-4,4′-diisocyanate, diphenylmethane-2,4′-diisocyanate, and diphenylmethane-2,2′-diisocyanate.

Process for preparing a flexible polyurethane foam comprising reacting at an isocyanate index of 70 to 130, 1) 40-65 parts by weight of a polyisocyanate composition comprising a) 80-100% by weight of a diphenylmethane diisocyanate component comprising, based on 100 parts by weight of the diphenylmethane diisocyanate component, i) 75-100 parts by weight of diphenylmethane diisocyanate comprising 15-75 parts by weight of 4,4′-diphenylmethane diisocyanate, and 25 to 85 parts by weight of 2,4′-diphenylmethane diisocyanate, and 2,2′-diphenylmethane diisocyanate and / or a liquid variant of such diphenylmethane diisocyanate, and ii) 0 to 25 parts by weight of homologues of diphenylmethane diisocyanates having an isocyanate functionality of 3 or more; and b) 20-0% by weight of toluene diisocyanate; 2) 20 to 45 parts by weight of a polyether polyol having an average molecular weight of 4500-10000, an average nominal functionality of 2-6 and comprising oxypropylene and optionally oxyethylene groups, the amount of oxypropylene groups being at least 70% by weight calculated on the weight of this polyol; 3) 3 to 20 parts by weight of a polyether polyol having an average molecular weight of 700-4000, an average nominal functionality of 2-6 and an hydroxyl value of at most 225 mg KOH / g and comprising oxyethylene and optionally oxypropylene groups, the amount of oxyethylene groups being at least 70% by weight calculated on the weight of this polyol; and 4) 2-6 parts by weight of water, wherein the amount of the polyisocyanate composition, polyol 2), polyol 3), and water being 100 parts by weight.

This invention relates to storage-stable, liquid, partially trimerized and allophanized polyisocyanates having an NCO group content of 15 to 41% by weight, and comprising 5 to 85% by weight of toluene diisocyanate, 5 to 85% by weight of a polyisocyanate of the diphenyl-methane series and an organic compound or mixture thereof. The present invention also relates to a process for the preparation of the storage-stable, liquid, partially trimerized and allophanized polyisocyanates; to storage-stable, liquid urethane prepolymers of these partially trimerized and allophanized polyisocyanates; and to a process for the production of these storage-stable, liquid, urethane prepolymers.

The invention relates to matrix resin for a carbon fiber composite material and a preparation method of the matrix resin. The matrix resin comprises N,N,N',N'-tetraglycidyl-4,4'-diaminodiphenyl ether epoxy resin, ES216 epoxy resin, 2,2-bi[4-(2-trifluoromethyl-4-maleimido phenoxy)phenyl]propane, 3,3'-dimethyl-4,4'-bi(4-carboxyl phthalimido)diphenylmethane, a curing agent and an organic solvent based on a mass ratio of 100 to (50-100) to (10-50) to (5-20) to (50-100) to (300-600). According to the matrix resin, the preparation process is simple; the raw materials are convenient to get; the obtained matrix resin is excellent in integral performance, can be used for preparing the high-performance carbon fiber composite material, can be applied to structure materials in the fields of sports equipment, aerospace, autos, electronics, micro-electronics and the like, is suitable for industrial production, and has a very high commercial prospect.

The invention discloses a processing method of effluent brine produced in MDI production process, comprising the following steps: (1) effluent brine containing phenylamine, diphenylmethane toluene diamine and polyamine, which is produced in MDI production process, carries out super-gravity extraction, and then tower-type extraction is carried out; (2) effluent brine discharged by the step (1) is fed to a stripping tower to carry out steam stripping; (3) effluent brine discharged from the stripping tower in step (2) and chemical oxidants are conveyed to an oxidation reactor, and air is vented to carry out aeration; (4) the effluent brine processed by the step (3) is transported to an adsorption tower to carry out adsorption. The effluent brine processed by the method of the invention has less than 8ppm of TOC, less than 2.5 ppm of TN (total nitrogen); sodium chloride and water and the other resources in effluent brine are realized, so as to carry out circulating utilization.

The invention discloses a silicon rubber / ethylene propylene terpolymer blending material and a processing method of the silicon rubber / ethylene propylene terpolymer blending material. The silicon rubber / ethylene propylene terpolymer blending material comprises silicon rubber raw rubber, ethylene propylene terpolymer raw rubber, diphenylmethane bismaleimide and an organic peroxide vulcanizing agent. In the silicon rubber / ethylene propylene terpolymer blending material vulcanized by peroxide, the vulcanizing speed of the ethylene propylene terpolymer component is improved by diphenylmethane bismaleimide, so that the vulcanizing speed of the ethylene propylene terpolymer component and the vulcanizing speed of the silicon rubber component trend to be close, and the purpose of co-vulcanization of all rubber components can be achieved. According to the invention, the silicon rubber / ethylene propylene terpolymer blending material is mixed and processed by an open two-roll rubber mixing mill and a sealed rubber mixing mill, and the rubber compound containing diphenylmethane bismaleimide is heated and vulcanized to obtain the silicon rubber / ethylene propylene terpolymer rubber compound with excellent properties.