52 results about "Cyclohexane diisocyanate" patented technology

The present invention relates to molded polyurethane/urea elastomers, and specifically to improved polyurethane/urea elastomers having high temperature stability to about 140–150° C. and low temperature flexibility at about −35–(−40)° C., for use in dynamic applications. These elastomers are particularly useful for application in belts, specifically in automotive timing or synchronous belts, V-belts, multi V-ribbed or micro-ribbed belts, flat belting and the like. The polyurethane/urea elastomers of the present invention are prepared by reacting polyisocyanate prepolymers with symmetric primary diamine chain extenders, mixtures of symmetric primary diamine chain extenders and secondary diamine chain extenders, or mixtures of symmetric primary diamine chain extenders and non-oxidative polyols, which are all chosen to eliminate the need for catalysts via standard molding processes, and to improve phase separation. The polyisocyanate prepolymers are reaction products of polyols which are nonoxidative at high temperatures, such as polycarbonate polyols, polyester polyols, or mixtures thereof, with organic polyisocyanates which are either compact, symmetric and aromatic, such as para-phenylene diisocyanate, 1,5-naphthalene diisocyanate, and 2,6-toluene diisocyanate, or are aliphatic and possess trans or trans,trans geometric structure, such as trans-1,4-cyclohexane diisocyanate and trans,trans-4,4′-dicyclohexylmethyl diisocyanate.

The invention belongs to the technical field of polymer preparation, and especially relates to a preparation method of a thermoplastic polyurethane elastomer. The method comprises the following steps: 1, putting 1,4-cyclohexyl diisocyanate, polyethylene glycol adipate, 1,4-butylene glycol, a lubricant and a hydrolysis resistance agent in a blender, fully stirring, and fully plastifying in a high-temperature plastifying machine or a high-temperature internal mixer to obtain a thermoplastic polyurethane elastomer matrix; 2, processing an inorganic nanofiller by a silane coupling agent to obtain an modified inorganic nanofiller; and 3, dissolving the thermoplastic polyurethane elastomer matrix in tetrahydrofuran, adding the modified inorganic nanofiller, mechanically stirring, removing tetrahydrofuran, and carrying out film forming to obtain the thermoplastic polyurethane elastomer. Compared with the prior art, the method provided by the invention can effectively increase the heat resistance, the mechanical performances and the ageing resistance of the polyurethane elastomer on the premise that the comprehensive performances of the thermoplastic polyurethane elastomer do not decrease.

The invention provides a piece of novel sewing-free hot melt adhesive TPU-PU leather, and a preparation method thereof. The TPU-PU leather comprises release paper, a hot melt adhesive film, a TPU film and a dry-type PU film, wherein the release paper comprises a paper bottom layer, an adhesive layer, a plastic layer, a transition layer, and a release layer; a hot melt adhesive raw material is composed of polyester polyol, diisocyanate, polyether polyol, and a plurality of additives; a TPU raw material is composed of polymer polybasic alcohol, 1,4-cyclohexane-diisocyanate, a chain extender and a plurality of functional additives; a PU raw material is composed of polyester dibasic alcohol, straight chain diol, isocyanate, TDI trimer, dimethyl formamide, butanone, black sand, and a plurality of functional addictives. Through the adoption of the preparation method, innovations are conducted on the raw material components of the release paper, the hot melt adhesive, the TPU film and the PU film; the manufactured sewing-free TPU-PU leather has the technical advantages of firmness in adhesion, durability, environment-friendly materials, no invisible harm to a human body, and the like.

The invention relates to a heat-resistant and high-damping polyurethane elastomer, which is prepared from the following raw materials by weight: 27.92%-33.56% of polytetramethylene glycol, 8.52%-9.03% of diphenyl-methane-diisocyanate, 26.02%-31.66% of polycaprolactone diol, 9.02%-9.70% of 1, 4-cyclohexane diisocyanate, 0.10%-0.30% of N, N'- dicyclohexylcarbodiimide, 4.91%-5.62% of neopentyl glycol, 0.06%-0.10% of dibutyltin dilaurate, 0.60%-0.90% of carbon nanotube, and 15.02%-15.45% of nano-silica, with the sum of the weight percentage of the components being 100%. The preparation method includes: weighing raw materials, preparing an acidified carbon nanotube, preparing a nano-silica dispersion solution, preparing a polyurethane elastomer prepolymer A, preparing a polyurethane elastomer prepolymer B, preparing a chain extender-carbon nanotube/neopentyl glycol composite hydroxyl component, preparing a polyurethane elastomer casting liquid, and preparing the heat-resistant and high-damping polyurethane elastomer by means of tape-casting. The method provided by the invention can solve the problem of poor heat resistance of polyurethane elastomers in the prior art, and the prepared polyurethane elastomer has high heat resistance and high damping property.

The invention discloses a waterproof anti-bacterial polyurethane composite material. Raw materials of the waterproof anti-bacterial polyurethane composite material include polypropylene oxide glycol, hydroxyl-terminated liquid silicone rubber, 1,4-cyclohexane diisocyanate, 1,5-naphthalene diisocyanate, 1,4-butynediol, 1,4-bis(2-hydroxethoxy)benzene, 4,4'-diaminodiphenyl sulphone, 1H,1H,10H,10H-perfluoro-1,10-decanediol, hydroxypropyl trimethoxysilane, dibutyltin dilaurate, methyl methacrylate, benzoyl peroxide, methyl-tri-butanone-oxime silane, polystyrene, polyvinyl chloride, an acrylonitrile-butadiene-styrene copolymer, a rare earth coordination compound and a composite filling, wherein the composite filling comprises oxidized graphene, a carbon nanotube, nanometer titanium dioxide, nanometer zinc oxide, nanometer copper oxide, nanometer carbon fibers and didodecyldimethylammonium bromide. The waterproof anti-bacterial polyurethane compound material provided by the invention is high in intensity, water resistance and bacterium resistance.

The invention discloses a method for synthesizing trans-1,4-cyclohexane diisocyanate, which comprises the following steps: (1) mixing trans-1,4-cyclohexanedicarboxylic acid with thionyl chloride, heating under reflux, decompressing and recovering the extra thionyl chloride for obtaining trans-1,4-cyclohexanedicarbonyl chloride; (2) adding toluene, benzene or xylene into the trans-1,4-cyclohexanedicarbonyl chloride, heating to 45-75 DEG C, and further adding sodium azide for obtaining mixture; and (3) keeping the temperature of the mixture for 0.5-1.5 hours at the temperature of 45-75 DEG C, filtering for removing insoluble matters, decompressing, recovering the toluene and distilling for obtaining the trans-1,4-cyclohexane diisocyanate. The synthesis method has the advantages of simple process route, easy obtainment of raw materials and short reaction period, thereby being applicable to industrial mass production.

The invention relates to the technical field of polyurethane adhesives, specifically to a waterborne polyurethane adhesive used for shoes and a preparation method thereof. The waterborne polyurethaneadhesive comprises the following raw materials by mass: 100 parts of polyether polyol A, 60 to 80 parts of polytetrahydrofuran diol, 25 to 30 parts of isocyanate, 12 to 19 parts of a hydrophilic chainextender, 50 to 80 parts of a solvent, 17 to 20 parts of a neutralizing agent, 11 to 15 parts of an amine chain extender and 170 to 190 parts of distilled water, wherein the polyether polyol A is polyether polyol which uses glycerin as a starting agent, uses epoxypropane for ring opening and oxirane for end termination, and has a functionality degree of 2.5 to 3.5 and a number average molecular weight of 4500 to 5500; and the isocyanate is 1,4-cyclohexane diisocyanate. The waterborne polyurethane adhesive provided by the invention has good initial strength and initial adhesion, high bonding strength and good heat resistance and water resistance in the process of use. The invention also provides a preparation method for the waterborne polyurethane adhesive.

The invention provides a modifying method of a cellulose acetate filtration membrane. The modifying method of the cellulose acetate filtration membrane is characterized by comprising the following specific steps: step 1, dissolving polyethylene glycol and polycarbonate dihydric alcohol into an acetone solvent so as to prepare a hydrophilic modified solution; step 2, immersing the cellulose acetate filtration membrane completely in the hydrophilic modified solution to moisten fully, sequentially adding a cross-linking agent 1, 4-cyclohexyl diisocyanate and a catalyst dibutyltin dilaurate to the hydrophilic modified solution, and carrying out grafting reaction directly; step 3, taking out the reacted cellulose acetate filtration membrane, draining off naturally until a dissociated solution in the filtration membrane is removed, heating, curing again, and drying completely, thereby preparing the modified cellulose acetate filtration membrane. The modified cellulose acetate filtration membrane prepared by the invention is higher in hydrophilia and pollution-prevention performance.

The invention discloses a 1, 4-cyclohexyl diisocyanate synthesis method. The 1, 4-cyclohexyl diisocyanate synthesis method comprises the following steps that 1, solid triphosgene is dissolved in chloroform; the solution is cooled to a temperature of -5 to 0 DEG C; and 1,4-cyclohexanediamine is slowly and dropwisely added into the cooled solution; and 2, the mixed solution is heated to a temperature of 40 to 70 DEG C and undergoes a reaction for 6 hours; reaction products are cooled to a temperature of 10 to 20 DEG C and then are washed by an alkali until the reaction products are alkalescent; after the reaction products has a pH value of 7, chloroform is recovered; and 1, 4-cyclohexyl diisocyanate which is a faint yellow waxy solid is obtained by reduced pressure rectification. The 1, 4-cyclohexyl diisocyanate synthesis method has a simple synthesis route, avoids use of hypertoxic gas, and has a high product yield above 80% and high purity above 98.5%.

The invention relates to the technical field of elastomer technology, in particular to a transparent highly flexible gel-like polyurethane elastomer (EPU). The elastomer is prepared by a component A,a component B and a component C, wherein the component A is polyester or a polyether glycol mixture, the polyether glycol mixture contains at least polyether glycol, polyol and functional polyol, thecomponent B is isocyanate prepolymer containing at least diphenylmethane diisocyanate, polyester polyol, 1,6-cyclohexane diisocyanate, the component C is filler containing plasticizer, the weight ratio of the component A to the sum of the component B and the component C is 1.15-1.2:1 and the weight ratio of the component B to the component C is 1:0.8-0.85. The beneficial effect of the invention isthat all the performance parameters of the obtained polyurethane elastomer can meet the demand simultaneously, the performance is excellent, the elasticity is good, and the product is environmentallyfriendly and corresponds to the demand of industrial production.

The invention discloses a preparation method of heat-resisting modified polyurethane composite, comprising: adding hexafluobisphenol A and 3-aminopropyl-methyldimethoxysilane into a reaction container, and reacting to obtain silicon-bearing chain extender; mixing well polycarbonate diols, hydroxyl-terminated liquid silicon rubber, nano calcium carbonate, montmorillonite and epoxy resin, adding 1,4-cyclohexane diisocyanate, dibutyltin dioctanoate and butanone, and stirring and reacting to obtain polyurethane prepolymer; mixing well the polyurethane prepolymer with 1,4-bis(2-hydroxyethoxy)benzene, 4,4'-diaminodiphenyl and the silicon-bearing chain extender, and stirring and reacting and then curing to obtain the heat-resisting modified polyurethane composite. The preparation method of the heat-resisting modified polyurethane composite provided herein has a simple process and mild conditions, and the obtained composite has high strength, good heat resistance and excellent ageing resistance and can meet the requirement of use in various fields.

The invention relates to a high-temperature-resistant polyurethane/modified vermiculite composite material and a preparation method thereof. The invention adopts the technical scheme as follows: the preparation method comprises the following steps: (1) performing sodium-based modification on primary mineral of vermiculite as a raw material to obtain sodium-based vermiculite, pulping the sodium-based vermiculite, adding quaternary ammonium salt surfactants with different long chains, stirring in a water bath with the temperature of 70-75 DEG C for about 2 hours, cooling, performing suction filtration, washing, and activating at 110 DEG C for 2 hours to prepare organic modified vermiculite; (2) adding the 3% organic modified vermiculite into polycarbonate polyol, performing high-speed stirring and ultrasonic dispersion for 2 hours, adding 1,4-cyclohexyl diisocyanate, reacting at 75 DEG C for 30 minutes to obtain a prepolymer, cooling the prepolymer to be 70 DEG C, controlling the value of R (-NCO/-OH), and adding a curing agent to obtain the high-temperature-resistant polyurethane/modified vermiculite composite material. The preparation methods of the organic modified vermiculite and the composite material are simple, the reaction conditions are mild, the mechanical property of the prepared composite material is remarkably improved, the temperature-resistant range can reach about 300 DEG C, and the composite material can be used for blocking a thick oil steam breakthrough channel.

The invention discloses a core material for a vacuum heat-insulating board and a preparation method thereof. The core material comprises the following raw material components: acrylic acid, calcium oxide, polyvinyl alcohol, methacryloylpropyltrimethyl ammonium chloride, stearic acid, potassium bisulfite, glass fiber, silicon dioxide, polyester fiber, 1,4-cyclohexane diisocyanate, polyethylene adipate glycol, a silane coupling agent, pentamethyldiethylene triamine, bentonite, a chain extender and Tween 20. The preparation method comprises the following steps: successively subjecting acrylic acid, calcium oxide, polyvinyl alcohol, methacryloylpropyltrimethyl ammonium chloride, stearic acid and potassium bisulfite to reacting so as to obtain a reactant; then carrying out shearing granulation, and carrying out drying so as to obtain a material 1; and subjecting glass fiber, silicon dioxide, polyester fiber, 1,4-cyclohexane diisocyanate, polyethylene adipate glycol, the material 1 and the remained components to a certain reaction so as to obtain the core material for the vacuum heat-insulating board. The core material obtained by using the method provided by the invention has good heat-insulating performance and vacuum compression use stability.

The invention relates to a polyurethane foam, especially to a polyurethane foam with organosilicon modified expanded graphite as a flame retardant. The polyurethane foam must contains organosilicon modified expanded graphite. The polyurethane foam further comprises polyester polyol, 1,4-cyclohexane diisocyanate, hydroxyl-terminated fluorosilicone resin, stannous octoate, triethylenediamine, a surfactant, an antioxidant and a drier. The polyurethane foam of the invention has the following beneficial effects: (1) good flame retardant effect; (2) low addition amount of the flame retardant; (3) good heat preservation effect; (4) no residual raw material inside the foam and no harm to the human body.

The invention discloses a prescription of polygeline injection and a preparation method thereof. The preparation method comprises the following steps: a. dissolving gelatin with water for injection, regulating the pH value of the gelatin solution to be 4.5-6.0, heating to 116-131 DEG C, keeping the temperature constant for 2-3 hours, stopping heating, and cooling to 25-40 DEG C; b. regulating thepH value of degradation liquid to be 8.0-9.0, adding cyclohexyl diisocyanate acetone solution, and stirring and crosslinking for 1.5-2.5 hours; c. carrying out reduced pressure distillation to obtainacetone; d. adding water for injection, potassium chloride, sodium chloride and calcium chloride in the remaining solution after distillation, and regulating the pH value to be 6.5-7.5; d. adsorbing and filtering; and e. sterilizing, carrying out visual check and packaging. The degradation condition controllability of the method is good; the weight-average molecular weight of polypeptide obtainedby hydrolysis is 5000-18500, which can satisfy the optimum conditional requirements of the crosslinking reaction; the crosslinking degree is high; the crosslinking product polypeptide is globular molecule; and the prepared polygeline injection conforms to the National Drug Standards. The clinical use result proves that the product is safe and effective.

The invention belongs to the technical field of a foaming thin film, and particularly relates to a functional TPU (thermoplastic polyurethane) foaming thin film. The functional TPU foaming thin film is prepared from the following raw materials in percentage by mass: 40-80% of water, 10-20% of 1, 4-cyclohexane diisocyanate, 5-35% of polyethyleneglycol adipate glycol, 2-5% of chain extender 1, 4-butanediol, 1-5% of a halogen-free flame retardant, 0.001-0.1% of a catalyst, 0.1-1% of a foam stabilizer and 0.2-0.8% of an antioxidant. Compared with the prior art, the functional TPU foaming thin film has the advantages that as water is used as a foaming agent, the environment damage caused by using fluorine-containing foaming agents such as HCFC-141b is effectively avoided; the flame retardant property of TPU foamed plastics is improved by adding the halogen-free flame retardant, and as the flame retardant in use does not contain halogens and heavy metal elements such as lead, cadmium, mercury and chromium, the functional TPU foaming thin film is in line with European Union VDE (Verband Deutscher Elektrotechniker) requirements and is an environment-friendly material.