254 results about "Tolylene Diisocyanate" patented technology

An insulation box unit and a refrigerator of the present invention employs i) rigid urethane foam with a 8.0 MPa-or-greater bending modulus, and a 60 kg/m³-or-lower density, and ii) a vacuum insulation material. The proper bending modulus provides the insulation box unit with a substantial strength, even in the case that the coverage of the vacuum insulation material with respect to the surface of the outer box exceeds 40%. The proper density prevents the insulation box unit from poor insulation efficiency due to undesired solid thermal conductivity. Despite of an extended use of the vacuum insulation material, the insulation box unit offers an excellent insulation efficiency and therefore accelerates energy saving. According to the recycling method of the present invention, rigid urethane foam formed of tolylene di-isocyanate composition, which was separated from refrigerator wastes, is recycled as a material of rigid urethane foam.

The invention relates to a method for continuously preparing toluene diisocynate, in particular to a method for preparing coarse toluene diisocynate by a phosgene method. The method comprises the following steps: mixing toluene diamine and DEIP solvent, performing low-temperature photochemical reaction on the mixture and excessive liquid phosgene in a jet reactor, heating and cracking a reaction product in a photochemical reaction tower to further decompose toluene dicarbamic chloride serving as an intermediate product to form the toluene diisocynate, recycling the reclaimed phosgene and the DEIP solvent, and delivering the hydrogen chloride gas serving as a side product to a hydrogen chloride absorption system.

The invention discloses a preparation method of ethidene diamine type polyether demulsifying agent. The ethidene diamine type polyethers demulsifying agent is prepared by that ethidene diamine serving as a raw material is subjected to crosslinking modification after reacting with ethylene oxide and epoxypropane. The preparation method comprises the following steps: in the presence of base catalyst, causing the ethidene diamine serving as an initiator to react with propylene oxide and ethylene oxide to prepare polyethers demulsifying agent A by two stages; then, in the presence of catalyst, carrying out selfcrosslinking reaction on the polyethers demulsifying agent A by utilizing polycarboxylic acid, thus preparing a product B; and finally, carrying out selfcrosslinking reaction on the polyethers demulsifying agent A and the product B by toluene diisocynate in the solvent, thus preparing the final product of the ethidene diamine type polyethers demulsifying agent. The demulsifying agent prepared by the preparation method has the advantages of higher relative molecular weight, ideal dehydration effect, good broad spectrum and small use amount, and is suitable for demulsifying and dehydrating crude oil in oil fields, and the removed water has good quality.

A low-free radical TDI polyurethane curing agent, its production and product are disclosed. The process is carried out by putting tolylene-diisoester cyanate, solvent S and catalyst A into reactor, adding into antioxidant and long-chain alcohol, agitating in reactor, heating, keeping temperature, inspecting NCO value, adding into phase-transferring solvent X while reaching NCO value to 20-40%, adding into catalyst B till reaching NCO value to 10-15, adding into inhibitor to stop reaction, adding into solvent S, decreasing pressure, distilling and removing phase-transferring solvent X. It's cheap and convenient.

The invention provides a polyurethane material which is obtained through a reaction of a first polyurethane prepolymer, a second polyurethane prepolymer and a chain extender. The first polyurethane prepolymer is obtained through a reaction of a polyhydroxy compound and one or two kinds of toluene diisocynate and benzene diisocyanate. The second polyurethane prepolymer is obtained through a reaction of a polyhydroxy compound and one or two kinds of 4,4'-diphenylmethane diisocyanate and naphthalene diisocyanate. The polyurethane material can be decomposed through the effect of water or microorganisms, and pollution is avoided; meanwhile, on the basis of the combination of the specific aromatic diisocyanate and the chain extender, the finally-obtained polyurethane material has the good strength and toughness.

The invention relates to a preparation method and use of an aqueous polymer/isocyanate adhesive, which belong to the technical field of chemical adhesives. In the invention, recycled polyethylene terephthalate (PET), diethanol amine, caprolactam and aqueous solution of glacial acetic acid are used to prepare a PET water-based polymer; toluene diisocynate and castor oil are used to prepare an isocyanate-terminated polyurethane prepolymer; and when used, PET aqueous polymer emulsion and the isocyanate-terminated polyurethane prepolymer are mixed at room temperature to obtain the aqueous polymer/isocyanate adhesive. The aqueous polymer/isocyanate adhesive is used for adhering wood.

The invention belongs to the technical field of curing agents and discloses a high-solid and averaged-molecular weight non-toxic polyurethane curing agent for a sub-gloss varnish and a preparation method thereof. The method comprises the steps of (1) in the nitrogen protection environment, adding a catalyst drop by drop in a reaction vessel filled with a solvent and toluene diisocynate during the stirring process, reacting at the temperature of 40-55 DEG C, cooling on the condition that the content of NCO is lowered to be 13%-23%, and adding an acidic polymerization inhibitor to obtain a toluene diisocyanate trimer; (2) mixing a polyhydroxy compound with a dehydrating agent, adding the obtained mixture in the toluene diisocyanate drop by drop, reacting and cooling to obtain a polyurethane addition product; (3) stirring and mixing the toluene diisocyanate trimer with the polyurethane addition product, separating in a film evaporator, adding a dilution solvent and stirring evenly to obtain the high-solid and averaged-molecular weight non-toxic polyurethane curing agent. The curing agent is centralized in the distribution of molecular weight, low in viscosity, and high in content of effective isocyanate groups. After a varnish is prepared by the curing agent, a paint film is fast in drying speed, good in levelability and high in fullness.

Disclosed are high performance aqueous polyurethanes and methods of making the same. The aqueous polyurethane is prepared by prepolymerizing the following components (a), (b), and (c) in the absence of aliphatic or cycloaliphatic diisocyanates; and chain-extending the hydrophilic prepolymer with component (d): (a) 10-40 wt % of an aromatic diisocyanate consisting of toluene diisocyanate (TDI); (b) 1-15 wt % of a compound containing active hydrogen and a hydrophilic group or a group capable of forming hydrophilicity; (c) 30-80 wt % of a polyol; and (d) 0.1-5 wt % of a chain extender having active hydrogen. The aqueous dispersions of the polyurethane have good storage stability and the dried films produced therefrom possess superior mechanical properties.

The invention discloses a modified polyurethane curing agent for an alkyd resin with high hydroxyl content. The modified polyurethane curing agent is prepared by the following raw materials by weight parts: 5-8 of alkyd resin, 5-8 of trimethylolpropane and 26-29 of toluene diisocynate, wherein the hydroxyl content of the alkyd resin is 5.5 to 6.4 percent. The invention also provides a preparation method for the modified polyurethane curing agent. The addition reaction is performed among the alkyd resin with hydroxyl content of 5.5 to 6.4 percent, trimethylolpropane and toluene diisocynate containing NCO groups, and the prepared modified bicomponent polyurethane curing agent has crosslinked NCO groups with high reactivity, so that modified polyurethane curing agent can be copolymerized with paint component containing hydroxyl groups at normal temperature to form paint films with different characteristics. Therefore, the modified polyurethane curing agent is excellent in operational performance and wide in application field.

Disclosed is a polymerizable composition for o an optical material containing tolylene diisocyanate, hexamethylene diisocyanate, and one or more polythiol compounds selected from the group consisting of 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane,4,8-, 4,7- or 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, pentaerythritol tetrakismercaptoacetate, pentaerythritol tetrakismercaptopropionate, 2,5-bis(mercaptomethyl)-1,4-dithiane, bis(mercaptoethyl)sulfide, 1,1,3,3-tetrakis(mercaptomethylthio)propane, 4,6-bis(mercaptomethylthio)-1,3-dithiane and 2-(2,2-bis(mercaptomethylthio)ethyl)-1,3-dithietane.

The invention discloses modified magnesium hydroxide, a preparation method thereof and application thereof in a polymer. The preparation method of the invention comprises the following steps: stirring magnesium hydroxide for 20-30min at the temperature of 30-120 DEG C while adding modifier slowly and evenly; and continuously stirring for 30-90min to obtain the modified magnesium hydroxide, wherein, the modifier is at least one of stearic acid, silicone oil, toluene diisocyanate or diphenyl methane diisocyanate. The preparation method improves the thermal stability of the magnesium hydroxide and the compatibility of the modified magnesium hydroxide with polymer; and when the obtained magnesium hydroxide is applied to preparing a fire retardant polymer, even the use amount of the modified magnesium hydroxide reaches 60% of the total weight of the polymer material, and the processability and mechanical property of the obtained fire retardant polymer are obviously improved and meet the requirement of fire resistance. The obtained modified magnesium hydroxide of the invention has simple used device and process, low production cost and capability of being widely applied to industrial production processes.

The invention discloses sterilization and aldehyde-removal nanometer polyurethane paint, which is composed of three components A, B and C. The component A is prepared by uniformly mixing alkyd resin 618, propylene glycol methyl ether acetate, a defoaming agent, a nanometer bactericide, wear-resisting prefabricated slurry, 1/4 second nitrocotton with a solid content being 28%, a leveling agent, an anti-settling agent and butyl acetate, the component B is prepared by uniformly mixing a tolylene diisocyanate (TDI) trimer, a TDI additive product and butyl acetate, and the component C is prepared by uniformly mixing propylene glycol methyl ether acetate, butyl acetate and cyclohexanone; and when the sterilization and aldehyde-removal nanometer polyurethane paint is used, the three components are uniformly mixed according to a weight ratio. Compared with similar products in the market, the sterilization and aldehyde-removal nanometer polyurethane paint disclosed by the invention has the function of removing formaldehyde in triple manners of absorption, decomposition and seal and has the advantages of favorable sterilization effect, good product adhesion force, scraping resistance, good application property and good tolerance.

The invention relates to a process for preparing a solution which comprises urea urethanes and is effective as a thixotropic agent, which involves reacting at least two structurally different monohydroxy compounds with an excess of toluylene diisocyanate to form monoisocyanate adducts, removing the unreacted portion of the toluylene diisocyanate, and reacting the resultant monoisocyanate adducts with diamines in an aprotic solvent in the presence of a lithium salt to form urea urethanes. The invention also relates to the use of the solution to receive thixotropic coating compositions.

A polyurethane polymer comprising 35 to 90 wt% of a poly(C2-4 alkylene oxide) based on the total weight of the polymer, wherein not less than 60% of the poly(C2-4 alkylene oxide) is poly Ethylene oxide, wherein at least 5% of the poly(C2-4 alkylene oxide) is bound to side chains based on the total weight of the polymer, and when the polyurethane contains 35 to 45% by weight of poly(C2-4 alkylene Oxygenation) such as by making di(hydroxymethyl)propionic acid, cyclohexanedimethanol, polypropylene glycol (1000), N-methylpyrrolidone and a Diol (750) and diethanolamine obtained α, α-dihydroxypolyethylene glycol reaction to produce a polymer, per 100g polymer contains 10 to 180 milliequivalents (meq) of acid groups.

The invention relates to a waterproof coating material, which comprises the following components, by weight, 22-28 parts of a pure acrylate emulsion, 9-13 parts of an ethylene-vinyl acetate copolymerization emulsion, 2-5 parts of ethylene glycol monobutyl ether, 4-7 parts of xylene, 8-12 parts of ethyl acetate, 1-4 parts of polyacrylamide, 2-8 parts of toluene diisocyanate, 1-3 parts of fatty alcohol polyoxyethylene ether, 4-9 parts of silicone oil, 2-4 parts of titanium dioxide powder, 3-5 parts of talc powder, and the balance of water. The waterproof coating material of the present invention has characteristics of unique waterproof performance, stable chemical performance, safety, environmental protection, corrosion protection, direct brushing, and convenient operation.

The invention discloses a preparation method of a polyurethane pervaporation phenol/water separating membrane compounded by inorganic particles, and belongs to the field of pervaporation membrane separation. The polyurethane membrane basic material is obtained by polymerizing and mixing monomer hydroxyl-terminated polybutadiene, toluene diisocynate, 4,4'-diamine diphenylmethane solution, cyclodextrin and silica or carbon fiber powder. The preparation method comprises the following steps: reacting hydroxyl-terminated polybutadiene with toluene diisocynate to obtain blocked prepolymer, then adding 4,4'-diamine diphenylmethane solution and cyclodextrin as chain extenders to perform the chain extension, and adding inorganic modified particle silica or carbon fiber powder (using N,N-dimethylacetamide as solvent) to obtain prepolymer solution of polyurethane; casting the solution on a polyfluortetraethylene plate to form a membrane, solidifying for 1-1.5 hours at room temperature, and moving the membrane to an oven at 80 DEG C to thermally treat to obtain the polyurethane membrane compounded by inorganic particles. The preparation method disclosed by the invention is simple in process, and the prepared membrane has good heat and chemical stability and mechanical property.

The invention discloses a polyurethane composite material regenerated from waste polyurethane soles and a preparation process thereof. The polyurethane composite material is prepared from the following raw materials in parts by weight: 170-180 parts of waste polyurethane soles, 10-14 parts of a compatibilizer, 5-7 parts of toluene diisocynate, 2-4 parts of tri(2,4-di-tert-butylphenol) phosphite ester, 4-6 parts of medical stone powder, 6-8 parts of organic silicon, 2-3 parts of ammonium polyphosphate, 12-18 parts of polyisocyanate, 3-5 parts of hybrid polyester polyol, 5-7 parts of dibutyltin dilaurate, 6-8 parts of alkanolamide, 4-5 parts of nano-alumina powder, 2-3 parts of antioxidant TNP, 7-9 parts of aluminum stearate, 8-10 parts of isocyanate, 4-6 parts of zirconium oxide, 9-11 parts of nano montmorillonite and 10-12 parts of additives. According to the invention, on one hand, the recovery problem of the waste polyurethane soles is solved, on the other hand, the raw materials are easy to obtain, the cost is low, the operation is simple, and emission of three wastes is avoided in the production, so as to protect the environment and reduce the production cost, and ensure that the economic benefit and the social benefit are considerable.

The invention discloses a curing agent, namely a methylene diphenyl diisocyanate (MDI) tripolymer and a method for preparing the same. The method comprises the following steps of: adding the MDI and an organic solvent into a reaction kettle, raising the temperature, dissolving the MDI, stirring uniformly, adding dehydrated polyol, and reacting for 1 to 6 hours at the temperature of between 40 and 90 DEG C to obtain modified MDI; reducing the temperature to 40 DEG C, dripping mixed solution of a trimerization catalyst and an organic solvent, reacting at the temperature of between 30 and 80 DEG C, and adding a polymerization inhibitor when the percentage of isocyanate group (NCO) reaches a preset value; and reducing the temperature to obtain the MDI tripolymer curing agent. The invention provides the method for preparing the tripolymer curing agent by using the MDI. The process is simple, the requirements of equipment are low, the content of the tripolymer is high, and the curing agent is well soluble in resins and can substitute a tolylene diisocyanate (TDI) tripolymer with similar performance. The curing agent is mainly used for being matched with two-component polyurethane coatings and main agents of adhesives, and can also be used for other fields.

The invention discloses a modified polyurethane elastic curing agent. The modified polyurethane elastic curing agent is prepared from the following raw materials in part by weight: 38 to 45 parts of polyester resin, and 12 to 16 parts of toluene diisocynate, wherein the content of hydroxyl groups of the polyester resin is 7.2 to 7.8 percent. In the curing agent, the polyester resin which has highflexibility and contains 7.2 to 7.8 percent of hydroxyl groups is adopted; and long chain aliphatic diacids with high flexibility, aromatic diacids containing benzene ring structures and excessive long-chain diols are introduced into the structure of the polyester resin, so that the polyester resin also has the characteristics of high flexibility, high glass transition temperature, high hydroxyl content and high reaction activity. Therefore, the two-component polyurethane elastic curing agent synthesized by reacting the polyester resin and a toluene diisocynate monomer containing NCO groups has the advantages of high hardness, high flexibility, and high activity when reacting with the hydroxyl groups. The reaction activity and the hardness and flexibility of paint films can be synchronously met when a crosslinking reaction of the polyurethane curing agent and a paint component containing the hydroxyl groups are performed for film formation.

The present invention discloses an environment-protecting type polyurethane paving material for sprorts ground. Said material is formed from component A, B and black rubber granules, which contains no high-toxicity tolylene diisocyanate and contains no heavy metal catalyst.

The making process of plastic track includes the following steps: reaction between dihydroxy polyether polyol and/or trihydroxy polyether polyol and toluene diisolcyanate to produce component A; preparing component B with 3, 3-dichloro-4, 4-amino diphenyl methane and/or 4, 4-methylene-bisdiethyl diphenyl, bis-6-methyl diphenylamine, tetrahydroxyamino polyether polyol, stuffing, plasticizer, nanometer base material, etc.; mixing component A, component B, catalyst and water solution to form the water solution processed polyurethane elastomer adhesive; and mixing the water solution processed polyurethane elastomer adhesive, waste tyre grain or other rubber grain and stuffing to form mixture for the plastic track. The plastic track has low cost.

The invention discloses a modified urethane acrylate copolymer. The modified urethane acrylate copolymer is prepared from 16.1 to 50.9 parts by mass of polyisocyanate, 15.4 to 40.2 parts by weight of polyether polyol, 0. 01 to 0.09 parts by weight of a catalyst, 3.1 to 11.6 parts by weight of carboxylated diol, 5.3 to 20.8 parts by weight of epoxy resin, 0.1 to 0.5 parts by weight of a polymerization inhibitor, 10.7 to 35.5 parts by weight of hydroxyl group-containing acrylate, and 10 to 80 parts by weight of a solvent. The polyisocyanate is a mixture of one or more of hexamethylene diisocyanate, tolylene diisocyanate, 1, 6-hexamethylene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, xylylene diisocyanate, and polymethylene polyphenyl polyisocyanate. The modified urethane acrylate copolymer has the advantages of simple operation and short production period. The modified urethane acrylate copolymer has the advantages of adjustable acid value, good heat resistance, strong corrosion resistance, good adhesion to the substrate and stable performance. The prepared photoresist has good comprehensive performances and is easy to promote and use.

A belt for papermaking shoe presses is provided which comprises a reinforcing fibrous base (6) and a polyurethane layer (2) united therewith, the reinforcing fibrous base (6) having been embedded in the polyurethane layer (2). The belt includes a polyurethane layer obtained by curing a mixture comprising: a urethane prepolymer obtained by reacting a polyisocyanate compound selected among p-phenylene diisocyanate, 4,4'-methylenebis(phenyl isocyanate), and tolylene diisocyanate with a polyol compound selected among polypropylene glycol, polytetramethylene glycol, and a polycarbonate diol; a hardener selected among an aliphatic diol compound, hydroquinone bis-ss-hydroxyethyl ether, and organic polyamine compound; and an aliphatic triol compound. Due to this layer, the shoe press belt for papermaking is excellent in wearing resistance and flexing fatigue resistance.

The present invention relates to polyurethane conveyer belt for coal mine and its making process. The polyurethane conveyer belt is covered with polyurethane elastomer, which is one polyol oligomer/toluene diisocyanate system or one polyol oligomer/diphenyl alkyl diisocyanate system. The polyurethane has optimized recipe, phosphate fire retardant and/or halogen fire retardant added while synthesis and in the amount accounting for 5-20 wt% of the pre-polymer, and antistatic agent of quaternary ammonium salt type surfactant one conducting carbon black added while casting the covering elastomer.The modified polyurethane elastomer is fire retardant, antistatic, wear resistant and suitable for use in coal mine, and has long service life and capacity of resulting in high conveying efficiency.

The invention discloses a high-barrier-property photovoltaic backboard of a multilayer structure. The photovoltaic backboard sequentially comprises a weather-proof outer layer, a first obstruction coating, a first base layer, a second obstruction coating, a second base layer, a third obstruction coating and an inner layer from top to bottom. The first obstruction coating, the second obstruction coating and the third obstruction coating are all double-component polyurethane systems. A component A is prepared from 15-25 parts of fluorine resin, 20-40 parts of polypropylene oxide polyhydric alcohols, 1-2 parts of defoaming agent, 0.5-1 part of catalyst, 5-10 parts of inorganic filler and 10-30 parts of organic solvent. A component B is a mixture containing one or two of toluene diisocynate, isophorone diisocyanate and trimethyl 1,6-hexamethylene diisocyanate. The component A and the component B are mixed according to the ratio NCO/OH=0.5-1.1. According to the high-barrier-property photovoltaic backboard, by designing the two base layers and the three obstruction coatings, the moisture barrier property and the insulativity of the backboard are effectively improved.