399 results about "Polytetrahydrofuran" patented technology

The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a high-static-rigidity high-damping low-pressure-change polyurethane elastomer and a preparation method thereof. Comprising a polyol component and an isocyanate component, and the polyol component comprises polyol A, a chain extender, a stabilizer, a hydrolysis-resistant agent and a catalyst; the isocyanate component is prepared from isocyanate, polyhydric alcohol B and branched chain unit alcohol; the polyol A comprises amine ether polyol and polytetrahydrofuran ether polyol; the polyhydric alcohol B comprises bio-based hydrolysis-resistant polyhydric alcohol and polytetrahydrofuran ether polyhydric alcohol; the bio-based hydrolysis-resistant polyol is prepared by carrying out a reaction on sebacic acid, 1, 2-propylene glycol and 1, 4-butanediol; the branched-chain unit alcohol is prepared from tetrahydrofuran and isooctanol through a reaction. By introducing the bio-based hydrolysis-resistant polyhydric alcohol and branched chain monohydric alcohol, the damping effect is remarkably enhanced, and on this basis, through formula adjustment and raw material screening, the product toughness is greatly improved, the compression set is reduced, and the performance of the product in heavy haul railway application is effectively optimized.

The invention belongs to the technical field of conductive adhesives, and particularly relates to a salt-fog-resistant waterborne conductive adhesive and a preparation method thereof.The salt-fog-resistant waterborne conductive adhesive is mainly prepared from, by weight, 5-10 parts of salt-fog-resistant waterborne polyurethane; 5 to 10 parts of water-based tackifying resin; 30 to 50 parts of conductive silver powder; 10 to 20 parts of ethanol; 2-10 parts of an anti-hydrolysis agent; and 10-30 parts of deionized water. According to the salt-fog-resistant aqueous conductive adhesive, polyurethane resin with polytetrahydrofuran alcohol and polycaprolactone polyol as main structures is used as matrix resin, a system is endowed with excellent water resistance and salt-fog resistance, the salt-fog-resistant aqueous conductive adhesive shows outstanding hydrolysis-resistant stability after being cured, and the salt-fog-resistant aqueous conductive adhesive and the conductive silver powder have a synergistic effect, so that the anti-settling performance is effectively improved.

The invention discloses a wear-resistant vehicle body film and a preparation method thereof, and relates to the technical field of films. The wear-resistant automobile body film prepared by the invention is prepared from polytetrahydrofuran ether glycol, isophorone diisocyanate, a catalyst, dihydric alcohol quaternary ammonium salt, a functional aid, modified silicon dioxide and a chain extender. The dihydric alcohol quaternary ammonium salt is obtained by reacting N, N '-dihexyl-N, N'-dimethyl propane-1, 3-diamine with monochloroacetone and then condensing with glycerol; the functional additive is obtained by reacting 2-boric acid thiophene-4-methyl acetate with 2, 7-dibromofluorene and then carrying out bromination hydrolysis; the modified silicon dioxide is obtained by reacting pretreated silicon dioxide with melamine and then reacting with sodium hypophosphite. The wear-resistant vehicle body film prepared by the invention has good anti-aging, wear-resistant, antibacterial and flame-retardant properties.

The invention relates to a hyaluronic acid-polyurethane composite material based on a double dynamic network and a preparation method and application thereof, and the preparation method comprises the following steps: carrying out hydrophobic modification reaction on hyaluronic acid and aminophenylboronic acid to obtain aminophenylboronic acid modified hyaluronic acid; the preparation method comprises the following steps: mixing polytetrahydrofuran ether glycol, polyethylene glycol and isophorone diisocyanate, carrying out a primary reaction, adding trimethylolpropane tri (3-mercaptopropionic acid) ester, carrying out a secondary reaction, adding tannic acid, and carrying out a third reaction to obtain tannic acid-terminated dynamic thionocarbamate polyurethane; and mixing the amino phenylboronic acid modified hyaluronic acid with the tannic acid terminated dynamic thionocarbamate polyurethane for reaction to obtain the hyaluronic acid-polyurethane composite material with the double dynamic networks. Compared with the prior art, by introducing a'thionocarbamate-borate 'double-dynamic network, high toughness, high strength, good self-repairability and repeatable processability in an extreme environment are realized, and the material is particularly suitable for manufacturing and repairing of key components in an LNG ship body and a heat insulation system thereof.

The invention relates to the field of new energy batteries, in particular to a negative electrode current collector and a preparation method thereof, a pole piece and a battery, and the preparation method comprises the following steps: preparing a carbon nanotube with a hydroxyl group on the surface; mixing a carbon nanotube with hydroxyl on the surface, an isocyanate raw material, diol, water and a second organic solvent, and carrying out heating reflux treatment to obtain a third product; mixing the third product, a polytetrahydrofuran raw material, a second organic solvent and a second ammonium salt, and carrying out a polymerization reaction to obtain a precipitate; carrying out drying treatment on the precipitate, so as to obtain foam polyurethane modified by the carbon nano tube; and taking the foam polyurethane modified by the carbon nano tube as a working electrode, carrying out deposition reaction on the working electrode to obtain a base material with a metal layer deposited on the surface, and washing and drying the base material with the metal layer deposited on the surface. The negative electrode current collector lithium metal battery provided by the invention has relatively large energy density, relatively small battery internal resistance, relatively strong cycle performance and relatively low safety risk.

The present invention relates to the field of polyurethane materials and particularly to a temperature-induced color-changing vehicle film and a preparation method therefor. The method of the present invention comprises: firstly, using polyurethane to wrap vanadium dioxide powder to obtain color-changing microcapsules; then using 1,1,1,3,5,5,5-heptamethyltrisiloxane and 3-allyloxy-1,2-propanediol as raw materials to synthesize an organosilicon-modified diol, and enabling trimellitic anhydride to react with toluene diisocyanate to synthesize a dicarboximide compound; enabling the organosilicon-modified diol and the dicarboximide compound to undergo an esterification reaction and a polymerization reaction to obtain an organosilicon-modified imide polyester diol; then mixing the organosilicon-modified imide polyester diol with polytetrahydrofuran ether glycol 2000, and then enabling the mixture to react with toluene diisocyanate to obtain a polyurethane elastomer; and mixing the polyurethane elastomer, the color-changing microcapsules, a silane coupling agent, a plasticizer, an antioxidant, and an ultraviolet light absorber, followed by melt extrusion and blow molding into a film, so as to obtain the temperature-induced color-changing vehicle film.

The invention discloses a preparation method and application of a wear-resistant TPE (thermoplastic elastomer) material for data lines, and the preparation method comprises the following steps: carrying out reaction on polytetrahydrofuran ether glycol and isophorone diisocyanate to form a polyurethane prepolymer, adding a reinforcing monomer and a modified filler, carrying out chain extension reaction, and finally adding ethylenediamine to prepare the wear-resistant TPE material. The TPE material is of a hyperbranched structure, the mechanical performance of the material can be improved, cross-linking points of the TPE material are increased by adding the modified filler, TPE material molecules form a stable grid shape, the wear resistance of the TPE material is further improved, a zinc organic framework is connected between the modified filler and a polyurethane prepolymer molecular chain, and the modified filler contains a six-membered ring structure, so that the wear resistance of the TPE material is improved. According to the present invention, the modified filler is added to the TPE material, such that the TPE material can well adapt to the surface contact when the TPE material is worn so as to reduce the wear, and the dynamic cross-linking of the modified filler and the TPE material molecules does not cause the substantial reduction of the toughness due to the increase of the cross-linking point so as to improve the bending resistance effect of the TPE material.

The invention discloses a preparation method and application of a reproducible self-healing polyurethane elastomer with synergism of dynamic silicon oxygen bonds and multiple hydrogen bonds. The method comprises the following steps: (1) carrying out a pre-polymerization chain extension reaction on polytetrahydrofuran, isophorone diisocyanate and a catalyst; (2) adding a 3, 13-dihydroxy propyl octaphenyl double-layer silsesquioxane monomer to carry out a chain extension reaction, and then adding carbohydrazide to carry out a reaction; and (3) adding glycerol and camphorsulfonic acid, uniformly stirring, pouring into a mold, curing and drying, thereby obtaining the reproducible self-healing polyurethane elastomer with synergistic dynamic silicon-oxygen bonds and multiple hydrogen bonds. According to the invention, a common fabric is soaked in a dispersion liquid formed by uniformly mixing diluted polyurethane and hydrophobically modified MXene to obtain the multifunctional composite material with the functions of self-cleaning, self-repairing, photo-thermal conversion and human body sensing.

The invention discloses a resin binding agent for a resin diamond wire, the resin diamond wire and a preparation method of the resin binding agent, and belongs to the technical field of binding agents for resin diamond wires. Two brand-new modified compounds are designed and synthesized, boron-containing and nitrogen-containing compounds are introduced to form a covalent bond enhanced polyurethane derivative; and the other one is a double-functional-group siloxane oligomer containing an epoxy group and a carboxyl group, which is prepared by carrying out hydrolytic condensation on raw materials such as methyltrimethoxysilane and the like, neutralizing and purifying. The resin binder takes epoxy-phenolic hybrid resin as a main body and is compounded with the two modified compounds, a curing agent, a coupling agent and other components. The resin diamond wire is prepared through wire core pretreatment, glue solution preparation, coating, multi-stage curing and post-treatment. The heat resistance, the bonding strength with diamond and the impact toughness of the bonding agent are remarkably improved, and the bonding agent is suitable for high-precision cutting of hard and brittle materials such as photovoltaic silicon wafers and the like.

The invention relates to the technical field of anti-seepage protective materials, in particular to a high-toughness high-molecular flexible auxiliary anti-seepage protective material and a preparation method thereof, and the high-toughness high-molecular flexible auxiliary anti-seepage protective material comprises a component A and a component B, the component A at least comprises the following preparation raw materials: first polyol, a chain extender, diisocyanate and an anti-aging agent, the mass ratio of the diisocyanate in the component A is 22-35%, and the mass ratio of the anti-aging agent in the component A is 0.1-1%; the first polyhydric alcohol is prepared from poly (neopentyl glycol adipate)-1, 6-hexanediol ester glycol, hydrogenated castor oil polyether polyol, polytetrahydrofuran glycol and polyfunctional polyether polyol, and the second polyhydric alcohol is prepared from poly (neopentyl glycol adipate)-1, 6-hexanediol ester glycol, hydrogenated castor oil polyether polyol, polytetrahydrofuran glycol and polyfunctional polyether polyol; the chain extender is prepared from dipropylene glycol and methyl propylene glycol; the component B is prepared from the following raw materials: second polyol, a plasticizer, a filler and an amine catalyst, and is subsequently coated on the surfaces of base materials such as asphalt concrete and concrete to isolate a bottom structure from the external environment, so that the effects of isolation, seepage prevention, protection, insulation, flame retardance and the like are achieved.

The invention belongs to the field of photovoltaic materials, provides a preparation method and application of reinforced polyurethane resin for a photovoltaic frame, and solves the problem that the existing polyurethane resin for the photovoltaic frame cannot have excellent flame retardant property, water resistance, aging resistance and mechanical property at the same time. Comprising the following steps: carrying out a reaction on polytetrahydrofuran ether glycol and polyisocyanate to obtain a polyurethane prepolymer, and chemically grafting a phosphorus-containing compound onto a polyurethane main chain by using prepared 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, so as to obtain the flame-retardant polyurethane. Hydroxyl-terminated polydimethylsiloxane and polyhydric alcohol are used as part of flexible chain segments to be embedded into a polyurethane main chain, 2-(2-hydroxy-4-acryloyl)-2H-benzotriazole is added to serve as an anti-ultraviolet agent, and final polyurethane resin is obtained through reaction. And injecting the polyurethane resin and the glass fiber into a mold, and preparing the photovoltaic frame profile through a pultrusion process.

The invention discloses a transparent polyurethane elastomer and a preparation method thereof, and relates to the technical field of polyurethane elastomers, the preparation method comprises the following steps: carrying out vacuum dehydration on polytetrahydrofuran ether glycol-2000 and polytetrahydrofuran ether glycol-1000 for later use; the preparation method comprises the following steps: preheating a reaction container, adding isophorone diisocyanate and benzoyl chloride, uniformly stirring, adding polytetrahydrofuran ether glycol-2000 and polytetrahydrofuran ether glycol-1000, and carrying out heat preservation reaction to obtain a polyurethane prepolymer; uniformly stirring polyether polyol N330, a chain extender, dibutyltin dilaurate, silicone oil, a defoaming agent, an antioxidant and an ultraviolet light absorber, carrying out vacuum degassing, adding into the polyurethane prepolymer, uniformly stirring, pouring into a mold, curing, molding and demolding to obtain the transparent polyurethane elastomer.

The invention relates to the technical field of polyurethane materials, in particular to a non-MOCA type fitness equipment rubber coating material and a preparation method thereof. The preparation method comprises the following steps: adding polytetrahydrofuran, isophorone diisocyanate, 1, 4-butanediol, a 2, 2-dimethylolpropionic acid solution, a hydroxyl chain extender, triethylamine, deionized water and a flame-retardant filler to obtain a polyurethane emulsion; and coating the polyurethane emulsion to form a film, and drying to obtain the polyurethane adhesive film. Adding the flame-retardant filler into ethanol, and ultrasonically dispersing uniformly to obtain dispersion liquid; spraying the dispersion liquid onto the surface of a polyurethane adhesive film to obtain a pretreated polyurethane adhesive film; and carrying out layer-by-layer self-assembly on the surface of the pretreated polyurethane adhesive film for 5-6 times to obtain a finished product. The finished product prepared by the invention has excellent flame retardant property, antibacterial property and mechanical property, thereby having wide application prospect in the technical field of polyurethane materials.

The invention provides bio-based MS base resin, bio-based MS glue and a preparation method of the bio-based MS base resin and the bio-based MS glue, and belongs to the technical field of high polymer materials. The MS base resin is isocyanate group silane terminated bio-based polyether polyol or polyether polyol subjected to chain extension. The polyether polyol is selected from one or more of bio-based polyethylene glycol, bio-based polypropylene glycol, bio-based poly (trimethylene ether glycol) and bio-based polytetrahydrofuran ether glycol. And mixing the bio-based MS base resin, the plasticizer, the filler, the catalyst III, the coupling agent and the auxiliary agent, and stirring under a vacuum condition to obtain the bio-based MS adhesive. The bio-based MS adhesive prepared by the invention is high in bio-based material content, uncomplicated in preparation process and low in energy consumption, and meanwhile, an adhesive body is good in mechanical property, high in stability and good in high temperature resistance and humidity and heat resistance.

The technology of the present disclosure generally relates to the field of power storage devices, and more specifically to a solid electrolyte, an electrode, a solid-state battery, and a method for producing the same. An aspect of the present disclosure relates to a process for producing a solid electrolyte, comprising the steps of: - contacting, in the presence of a catalyst: - a polymer precursor compound comprising polyethylene glycol (PEG) and / or polytetrahydrofuran (PTHF), wherein the polymer precursor compound comprises on average per polymer precursor molecule, -at least 2.0 alkoxysilyl functional groups, with a functionality of at least 2.0, preferably at least 2.5, preferably at least 3.0; and / or -at least 1.0 alkoxysilyl functional groups, with a functionality of at least 3.0; - optionally, an organo-tri-alkoxy silane, an organo-tetra-alkoxy silane, and / or a mixture thereof comprising a metal ion (M+) chelating moiety being a cyanurate, a crown ether, an aza-crown ether, a thia-crown ether, a cryptand, a carbamate, a cyano group, a thiocyanate group, or a metallacrown,, - a metal (M+) salt, preferably does the metal salt comprises Li+, Na+, Mg+, Ca+, Al+, and / or a combination thereof, preferably lithium (Li+); - a solvent, preferably an organic solvent; and, - optionally, an ionically conductive compound; thereby obtaining a solid electrolyte; - optionally, drying the obtained solid electrolyte.

The invention relates to the technical field of fracturing proppants, in particular to a method for preparing a low-density ceramsite sand fracturing proppant by taking magnesium oxide as a raw material, kaolinite coal gangue and solid waste ceramsite sand powder are adopted as main raw materials of inner core particles, magnesium oxide is introduced to reduce the density of the proppant, and the magnesium oxide acts with manganese oxide, potassium feldspar and dolomite to reduce the sintering temperature; the composite biomass-based porous activated carbon is used as a framework; the modified epoxy resin, the composite biomass-based porous activated carbon and the curing agent are used for preparing a self-repairing high-temperature-resistant, hydrophobic, wear-resistant and corrosion-resistant outer-layer coating film, so that the ceramsite sand fracturing propping agent is endowed with durable high flow conductivity; the self-repairing polyurethane is prepared by taking hydroxyl-terminated long alkyl chain Schiff base as a modifier in a prepolymerization process, taking polypropylene carbonate glycol, polytetrahydrofuran ether glycol and isophorone diisocyanate as raw materials, taking 2, 6-diaminopyridine as a chain extender and taking a carboxyl-containing imidazolyl hydrophobic copolymer as an end-capping reagent.

The invention discloses a bio-based modified high polymer material and a preparation method thereof, and relates to the technical field of high polymer materials. When the bio-based modified high polymer material is prepared, firstly, lignin reacts with terephthalaldehyde to prepare formylated lignin; carrying out multi-component reaction on the aldehyde lignin to obtain modified lignin; the preparation method comprises the following steps: reacting 4-mercaptophenylboronic acid with 1-mercaptoglycerol to prepare a dimercaptoborate cross-linking agent; the preparation method comprises the following steps: reacting isophorone diisocyanate with polytetrahydrofuran ether glycol, and then reacting with a flame-retardant chain extender, 1, 2-propylene glycol and hydroxyethyl methylacrylate to prepare modified polyurethane; and mixing the modified polyurethane, the modified lignin and a dimercaptoborate cross-linking agent, casting and curing to obtain the bio-based modified high polymer material. The bio-based modified high polymer material prepared by the invention has the advantages of flame retardance, antibacterial property, aging resistance, self-repairing property, repeatable processing and high mechanical strength.

The application discloses a preparation method of a photo-thermal ice-resistant super-hydrophobic coating and the super-hydrophobic coating, and comprises the following steps: heating and vacuumizing polytetrahydrofuran (PTMG) to remove water, so as to obtain PTMG after water removal; heating and vacuumizing hydroxypropyl-terminated polydimethylsiloxane (PDMS-OH) to remove water, so as to obtain PDMS-OH after water removal; mixing the PDMS-OH after water removal and the PTMG after water removal, adding ethyl acetate solvent to stir, adding dicyclohexylmethane diisocyanate (HMDI) and dibutyltin dilaurate (DBTDL) dropwise, pre-polymerizing, adding di(2-hydroxyethyl) disulfide (HEDS) when the reaction reaches equilibrium, and preparing polyurethane after the reaction is completed; mixing ZrN nanoparticles, SiO2-F and the polyurethane to obtain a suspension through ultrasonic treatment; spraying the suspension to obtain a coating, and drying the coating to obtain the photo-thermal ice-resistant super-hydrophobic coating. The coating prepared by the application has excellent ice-resistant performance, and can delay the icing time for up to 1422s at-20 DEG C, and the icing time of a blank control group is 17s, which is better than most of the known ice-resistant super-hydrophobic coatings.

A high-strength laminated glass based on an interlayer membrane and a preparation method thereof are provided, which relate to the technical field of laminated glass. The preparation method of the high-strength laminated glass based on the interlayer membrane comprises: Step 1: successively adding polytetrahydrofuran ether glycol and an reactive anti-UV agent into N,N-dimethylformamide, successively adding diisocyanate and an organotin catalyst under the atmosphere of nitrogen, heating to 80-85° C. to react for 2-3 h, performing vacuum de-bubbling; Step 2: soaking the interlayer membrane in toluene for 6-10 h, transferring the soaked interlayer membrane to methanol to be soaked for 2-4 h, and drying for 3-5 days at room temperature to obtain a modified interlayer membrane; and Step 3: placing the modified interlayer membrane in the middle of two layers of glass, and then performing hot press compound to obtain the high-strength laminated glass.

The invention relates to the technical field of polyurethane coatings, and mainly relates to a waterproof polyurethane coating and a preparation method thereof. The invention discloses a water-resistant polyurethane coating which is prepared from the following components in parts by weight: 50 to 60 parts of polycaprolactone diol, 10 to 20 parts of polytetrahydrofuran, 20 to 30 parts of diisocyanate monomer, 0.01 to 0.1 part of catalyst, 1 to 2 parts of chain extender, 40 to 50 parts of solvent and 1 to 4 parts of modified nano zirconium oxide, the preparation method of the modified nano-zirconia comprises the following steps: dispersing nano-zirconia in an alcohol solvent, and carrying out ultrasonic dispersion; adding the dodecyl phosphoric acid and the octadecyl phosphoric acid in a stirring state, and reacting for 1.5-2.5 hours under the condition of 38-42 DEG C; and filtering, and drying the obtained solid part to obtain the modified nano zirconium oxide. The water-resistant polyurethane coating provided by the invention has remarkable water resistance, acid and alkali resistance and wear resistance.

The invention discloses a preparation method of an antibacterial warm-keeping fabric, and relates to the technical field of textiles. When the antibacterial warm-keeping fabric is prepared, firstly, (E)-butyl-2-ene-1, 4-diamine, glyoxal, formaldehyde and butyric acid are used as raw materials to synthesize a polyimidazolium salt antibacterial agent, then the polyimidazolium salt antibacterial agent is copolymerized with polytetrahydrofuran ether glycol and diphenylmethane diisocyanate to prepare an antibacterial polyurethane spinning solution, and the antibacterial fabric is obtained through wet spinning and weaving. The preparation method comprises the following steps: reacting L-cysteine with 3-amino propyl triethoxy silane to prepare cysteamine acyl propyl triethoxy silane, reacting with formaldehyde and phosphorous acid to obtain flame-retardant modified silane, and further preparing a silicon dioxide solution from the flame-retardant modified silane and sol-gel such as methyltrimethoxysilane; finally, the antibacterial fabric is treated with a benzophenone solution and then soaked with a silicon dioxide solution, and the antibacterial thermal fabric is prepared through ultraviolet irradiation, standing gelation, aging and hexane washing. The prepared fabric has excellent antibacterial property, heat retention property and flame retardant property.

The invention belongs to the technical field of foaming polyurethane, and provides a microsphere foaming polyurethane material, a base plate and a preparation method and application of the base plate, raw materials are prepared from a polyol component and an isocyanate component according to the proportion that the isocyanate index is 1.05-1.15; wherein the polyol component is prepared from the following components in parts by mass: 60 to 65 parts of polytetrahydrofuran polyol, 10 to 15 parts of poly trimethylene ether glycol, 6 to 8 parts of polypropylene oxide polyol A, 6 to 10 parts of polypropylene oxide polyol B, 4 to 6 parts of 1, 4-butanediol, 0.5 to 1.5 parts of trimethylolpropane, 0.3 to 0.5 part of a catalyst, 0.8 to 1.5 parts of a foam stabilizer, 0.5 to 0.7 part of a dispersing agent EFKA-4040 and 0.1 to 0.3 part of polyether modified polysiloxane BYK-333; 0.4 to 0.6 part of expansion microspheres and 0.1 to 0.3 part of water. According to the technical scheme, the problem that a polyurethane material in the prior art cannot have low compression set and excellent fatigue resistance at the same time is solved.

The present invention relates to the technical field of polyurethane hydrophobic materials, and discloses a preparation method and application of a hydrophobically modified polyurethane nanocomposite material, comprising the following steps: (1) mixing polytetrahydrofuran, polypropylene glycol, and isophorone diisocyanate for reaction; (2) adding dihydroxy-terminated polydimethylsiloxane or glycerol monostearate to the reaction solution for reaction, then adding a chain extender for reaction, and adding triethylamine for neutralization to obtain a modified waterborne polyurethane emulsion; (3) adding SiO2 powder to octadecyltrichlorosilane for reaction to obtain hydrophobic SiO2 powder; (4) adding the hydrophobic SiO2 powder to ethyl acetate to obtain a first mixed solution; adding the modified waterborne polyurethane emulsion to ethyl acetate to obtain a second mixed solution; and adding the first mixed solution to the second mixed solution to obtain a hydrophobically modified polyurethane nanocomposite material. The present invention combines modified waterborne polyurethane with nano-SiO2 to achieve good hydrophobicity and durability.

The application discloses a kind of high flame-retardant tpe materials and preparation method thereof, by polytetrahydrofuran, modified monomer and 4,4'-dicyclohexyl methane diisocyanate are reacted, chain extension is used with 1,4-butanediol, finally join flame-retardant additive, form branched structure, and the molecular structure of the pte material is branched structure, and molecular chain segment contains organic silicon composite organic phosphorus structure, when heat decomposition, can generate phosphoric acid, poly-metaphosphoric acid and other acidic substances, these acidic substances will catalyze pte molecule to occur dehydration reaction, accelerate its crosslinking, organic silicon chain segment will produce inorganic silicate or silicon-carbon, and then form a dense carbon layer on the surface of material, can heat insulation and oxygen isolation, prevent combustible gas to escape outward and oxygen diffusion inward, and slow down the further thermal decomposition of internal material, prevent carbon layer from being burnt through or collapse under high temperature, improve the durability of barrier, so that pte material has good flame-retardant effect.

The utility model provides a vacuum collecting device for polytetrahydrofuran production, and relates to the technical field of polytetrahydrofuran production devices. The vacuum collection device for polytetrahydrofuran production comprises an alcoholysis system, a first neutralization system and a second neutralization system which are connected with a discharge tank, a first vacuum assembly is arranged between the alcoholysis system and the discharge tank, and a second vacuum assembly is arranged between the first neutralization system and the discharge tank. A vacuum assembly III is arranged between the neutralization system II and the discharge tank, and the discharge tank is also connected with a nitrogen pipeline. The device can realize continuous discharge of materials without intermittent discharge, reduces workload, saves time and labor, does not affect vacuum of each system, and ensures normal work of each system.

The invention belongs to the technical field of polyurethane elastomers, and particularly relates to TPU (thermoplastic polyurethane) for an AR (augmented reality) lens with a self-adaptive dimming function and a preparation method of the TPU. The self-adaptive dimming TPU for the AR lens is prepared from the following raw material components in parts by weight: diisocyanate, modified spirooxazine, polytetrahydrofuran, a chain extender, an ultraviolet light absorber, a free radical scavenger, an anti-hydrolysis agent and a catalyst, the modified spirooxazine is prepared by the following steps: reacting a spirooxazine parent with brominated alcohol to generate hydroxyalkyl spirooxazine, and then reacting the hydroxyalkyl spirooxazine with isocyanate to generate-NCO modified spirooxazine. According to the TPU for the self-adaptive dimming AR lens, millisecond-level self-adaptive adjustment of the light transmittance ranging from 30% to 95% can be achieved, the migration resistance is good, the optical performance is excellent, the invention further provides the preparation method of the TPU, and the preparation method is simple and easy to implement.

The application provides a preparation method of a polyurethane foaming material. The preparation method comprises the following steps: firstly, pre-polymerization of polytetrahydrofuran ether glycol and hexamethylene diisocyanate; then, mixing, extruding, and granulating of polyhexalactone dihydric alcohol and a catalyst to obtain polyurethane granules. The granules are dried and injection molded into a small embryo to be foamed. The small embryo is immersed in supercritical carbon dioxide, nitrogen is introduced for auxiliary foaming, and gradient pressure relief control is implemented in the foaming process. After foaming, curing treatment is performed to obtain the polyurethane foaming material. The preparation method is beneficial to improving the cell uniformity of the polyurethane foaming material and improving the performance stability of the material after rebound, compression, and aging.

The invention relates to a viscosity-reducing adhesive, and discloses a preparation method of an acid-resistant viscosity-reducing adhesive tape, which comprises the following steps: reacting polytetrahydrofuran ether glycol, hydroxyl-terminated allyloxy polyester, an isocyanate monomer, dibutyltin dilaurate, 1, 4-butanediol and the like, and then adding an active diluent and a photoinitiator to obtain the acid-resistant viscosity-reducing adhesive tape. The side chain of polyurethane contains alkenyl with smaller steric hindrance, the alkenyl and the reactive diluent are subjected to better photocuring cross-linking reaction, and after photocuring, the volume of a cured adhesive film of the viscosity-reducing adhesive is shrunk, so that the adhesive property and the peel strength are reduced, and the viscosity-reducing adhesive shows excellent viscosity-reducing property and easy-to-peel effect. Meanwhile, the acid resistance of the polyurethane adhesive is improved, and high peel strength is still kept after acid leaching.

The invention discloses a polyurethane filling adhesive as well as a preparation method and application thereof, and relates to the field of cable materials. The polyurethane filling adhesive comprises hydrophobic polyurethane, an anti-hydrolysis agent, a heat conducting agent and a flame retardant; the hydrophobic polyurethane is formed by polymerizing a soft segment, a hard segment and an amine chain extender, and the soft segment comprises at least one of polytetrahydrofuran ether, dihydroxybutyl-terminated polydimethylsiloxane and aminopropyl terminated polydimethylsiloxane; the anti-hydrolysis agent comprises triisopropanolamine, a carbodiimide anti-hydrolysis agent and an epoxy silane anti-hydrolysis agent. Hydrophobic polyurethane adopts a soft segment containing hydrophobic groups, hydrolysis is inhibited from the source, meanwhile, the hydrolysis resistance is improved in cooperation with the ternary compound hydrolysis-resistant agent, a compact highly-physical cross-linked network is constructed, hydrolysis is inhibited from a chemical structure and a physical barrier community through cooperation of the three components, and long-acting hydrolysis-resistant protection is achieved; and the stability of heat-conducting property and flame-retardant property of the material is maintained in a severe environment in which a high-voltage cable is used.

The invention relates to the technical field of polyurethane foam preparation, and discloses polyurethane foam for a heat insulation strip and a preparation method of the polyurethane foam. The polyurethane foam is prepared from the following raw materials in parts by weight: 40 to 60 parts of polytetrahydrofuran ether glycol, 10 to 15 parts of modified monomer, 1 to 5 parts of ethylenediamine, 1 to 5 parts of hydroxyethyl methylacrylate, 60 to 80 parts of diphenylmethane diisocyanate, 3 to 5 parts of modified filler, 0.3 to 0.5 part of benzophenone and 10 to 15 parts of n-pentane. Double bonds on hydroxyethyl methylacrylate can react with sulfydryl on the surface of the modified filler, then a cross-linked network is formed in the material, the foam structure is more uniform and stable by limiting molecular chain movement and reducing gas diffusion and heat conduction paths, and the closed-cell rate of the foam can be increased by matching with a multi-layer coated hollow structure of the modified filler, so that the thermal conductivity of the foam is improved. And gas diffusion is reduced, so that the long-term stable heat insulation effect is maintained.