427 results about "Propylene oxide" patented technology

The invention relates to the technical field of adhesives, and particularly discloses a low-formaldehyde environment-friendly adhesive and a preparation method thereof. The invention relates to a low-formaldehyde environment-friendly adhesive which is prepared from the following raw materials in parts by mass: 30-50 parts of modified starch, 15-25 parts of vegetable protein, 5-10 parts of modified nano cellulose, 2-5 parts of a composite cross-linking agent and 80-150 parts of water, the composite cross-linking agent comprises amino silane and polyaspartic acid; the modified starch is prepared by performing graft copolymerization on starch subjected to enzymolysis by alpha-amylase and composite anhydride; the vegetable protein is subjected to alkalization and heat treatment before being used; the modified nano-crystalline cellulose is prepared by performing ring-opening etherification reaction on nano-crystalline cellulose, epoxypropane and ethylene oxide in sequence. The low-formaldehyde environment-friendly adhesive prepared by the invention has relatively good bonding strength and relatively low formaldehyde emission.

The application relates to the technical field of catalysts, and discloses a limited type iodine-based homogeneous immobilized catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and iodine ions, magnesium ions and quaternary ammonium ions loaded on the carrier, wherein the molar ratio of the magnesium ions, the quaternary ammonium ions, the iodine ions and the carrier is 0.01-1:4-15:1-30:1. The limited type iodine-based homogeneous immobilized catalyst disclosed by the application enhances the electrostatic interaction between iodine ions and quaternary ammonium ions through the molecular sieve limiting effect to construct a limited type structure. The catalyst has significantly enhanced CO2 adsorption and activation capacity, can activate an epoxide compound, and accelerates the ring opening of the epoxide compound. In a cycloaddition reaction catalyzed by the catalyst under the conditions of no solvent and no auxiliary agent, the conversion rate of propylene oxide can reach more than 73%, and the propylene carbonate selectivity can reach more than 85%.

This invention relates to the field of hafnium carbide technology and discloses a thermal decomposition preparation process for hafnium carbide precursors. The process includes: dissolving hafnium tetrachloride in anhydrous ethanol, adding propylene oxide dropwise for neutralization and acid removal to obtain a neutral ethanol-hafnium precursor solution; adding ethyl acetoacetate methacrylate and heating for coordination to obtain a hafnium coordination monomer solution; adding acrylonitrile and an initiator and heating for polymerization; when the viscosity of the reaction solution increases, injecting a dimethyl sulfoxide hot solution of melamine as a locking liquid; precipitating, separating, and drying to obtain the hafnium carbide precursor; and after oxidative crosslinking treatment, calcining at high temperature under an inert atmosphere to undergo carbothermic reduction to obtain hafnium carbide powder. This invention achieves molecular-level dispersion of precursor components through liquid-phase coordination and in-situ network locking, effectively reducing the reaction temperature and inhibiting grain agglomeration, thus producing high-purity, ultrafine hafnium carbide powder.

The application provides a water-based acrylic sealant for food cans and a preparation method thereof. The sealant comprises the following components: a water-based acrylic emulsion and an external emulsifier, wherein the external emulsifier is a propylene oxide-ethylene oxide-propylene oxide type block polyether emulsifier, the molecular weight of the ethylene oxide segment is 300-500, and the total molecular weight of the propylene oxide segment is 400-1000. The sealant can still maintain good sealing performance in boiling water and hot oil, and the sealant can still be normally transported and used under low-temperature conditions without failure.

Disclosed is a method for preparing oxetan-2-ylmethanamine, which belongs to the field of organic synthesis. [2-(1-ethoxyethoxy)methyl]propylene oxide is used as an initial raw material, and reacted in the presence of potassium tert-butoxide and trimethylsulfoxonium iodide; the resulting product is reacted with a sulfonyl compound and triethylamine; the resulting product is reacted with a compound of phthalimide; the resulting product is reacted with an amino group-containing compound, to obtain oxetan-2-ylmethanamine. The method according to the disclosure allows for an overall yield of not less than 30% in scale-up production (kilogram level), which is higher. Moreover, compared with the traditional method for preparing oxetan-2-ylmethanamine, a palladium-carbon catalytic hydrogenation step is not required, and dangerous chemical-sodium azide is not required in the method according to the disclosure. Thus, the method has high safety, low production cost, simple operations, and thereby is suitable for industrial production.

The invention discloses a method for preparing a corrosion-resistant composite film by using an acyl fluoride byproduct, and belongs to the technical field of preparation of corrosion-resistant films on surfaces of steel materials. The method comprises the following steps: by taking a perfluoropropylene oxide (HFPO) acyl fluoride byproduct as a raw material, mixing the raw material with a solvent and an acid-binding agent to prepare a film-forming agent; and double-layer self-assembly of a polyacrylic acid layer and an acyl fluoride by-product film layer is carried out on the surface of the steel by combining a polyacrylic acid mixed solution, and the corrosion-resistant composite film is formed on the surface of the steel after high-temperature curing. According to the invention, the high value of the HFPO byproduct is realized, the dripping time of the copper sulfate of the composite film reaches 298-426 s, and the electrochemical corrosion resistance is excellent; and chromizing and phosphating pollution processes are not needed, the process is simple and convenient, the cost is low, and the method is suitable for steel materials and can be popularized to the field of manufacturing of buildings, automobiles and major equipment.

This invention discloses a novel siloxane defoamer synthesis and production process. The defoamer comprises 2-10 parts of hydrophobically treated fumed silica or nano-silica filler, 40-70 parts of a concentrated silicone oil composition, 40-70 parts of high-viscosity polydimethylsiloxane, and 100-150 parts of a fatty alcohol-propylene oxide polymer. Two types of concentrated silicone oil compositions are used, exhibiting diverse structures and chain lengths, totaling 16 types, with clearly defined preparation methods. The filler undergoes special hydrophobication treatment, and the preparation process includes mixing with the concentrated silicone oil, reaction heating, and centrifugal separation. The production process involves mixing the components in a specific ratio, followed by high-speed stirring, addition of oleic acid, and heating to obtain the novel siloxane defoamer. The components of this invention work synergistically to enhance defoaming and foam suppression capabilities. The process is simple, easy to operate and control, and the product has strong versatility. It performs excellently in high-viscosity oily systems, effectively solving foaming problems in various oily systems. It is low-cost, high-efficiency, and its performance is adjustable, exhibiting good stability and compatibility.

The invention discloses a functionalized polycarbonate material and a preparation method thereof, and belongs to the field of high polymer materials. The material takes carbon dioxide as a green monomer, double-bond active sites are pre-buried in a polycarbonate main chain through ring-opening copolymerization, and carboxyl, amino or heterocyclic functional side chains are efficiently grafted through thiol-ene click reaction. The preparation method comprises the following steps: under the action of a composite catalyst, copolymerizing a double-bond-containing monomer, propylene oxide and COO to synthesize a precursor; and driving the sulfydryl monomer to carry out click reaction through thermal or photo-initiation. The innovation point lies in that the limitation of traditional protection / deprotection is broken through, multiple functions are integrated, hydrophilic carboxyl, antibacterial amino and conductive thiophene group have a synergistic effect, meanwhile, high mechanical strength and controllable degradability are kept, and the preparation method is suitable for the fields of biomedicine and electronics.

Urethane group-containing, isocyanate-terminated prepolymers are made from an organic polyisocyanate and a poly(propylene oxide) that has mainly primary hydroxyl groups and contains 90% by weight or more oxypropylene groups. The prepolymers are useful for making polyurethane elastomers when used in either a one-part, moisture cured process or as a component of a two-part elastomer-forming reactive system. The elastomers tend to have unexpectedly high tensile moduli at a given hard segment content.

The present application relates to the technical field of concrete admixtures, in particular to a shrinkage-reducing admixture for concrete, a preparation method and application thereof.The preparation process of the present application overcomes the problems of poor alkali resistance of traditional admixtures and easy cracking of solidified concrete.The present application comprises the following steps: preparing a reducing initiator, a chain transfer agent, an unsaturated acid monomer, a shrinkage-reducing functional monomer and an amide functional monomer solution by step-by-step preparation, controlling the polymerization conditions under nitrogen protection, and obtaining a water reducing agent; using alkyl glycoside as a starter, step-by-step polymerizing propylene oxide and ethylene oxide to obtain a low-foaming polyether; mixing the water reducing agent and the low-foaming polyether with an alkali-resistant additive to obtain a shrinkage-reducing admixture; and significantly improving the water-reducing rate, flow retention and compressive strength of concrete, optimizing the setting time, reducing the dry shrinkage rate and the influence of alkali erosion, and improving the compactness and durability of concrete through hydrogen bond network, low surface tension and alkali resistance protection.The viscosity of the concrete admixture is moderate, which is suitable for concrete application, and the process is stable and easy to industrialize.

The application provides an alkali-resistant nanofiltration membrane wire and a manufacturing method thereof, and relates to the technical field of nanofiltration membranes.The manufacturing method comprises the following steps: mixing and crushing amino-modified cellulose, polyamide, polyethylene glycol and dimethyl sulfoxide to form a spinning solution, and preparing a nascent membrane through dry-jet wet spinning; the nascent membrane is put into a coagulation bath to be solidified to prepare a hollow fiber base membrane; the mass ratio of the amino-modified cellulose, the polyamide, the polyethylene glycol and the dimethyl sulfoxide is 1:3-5:0.2-0.5:2-10; propylene oxide, water, aniline monomer and an initiator are prepared into a casting solution according to the mass ratio of 1:5-10:1-3:0.01-0.1; the hollow fiber base membrane is immersed in the casting solution for 2-3 hours, is heated to 35-45 DEG C for cross-linking reaction for 2-4 hours, and is dried and washed.The alkali-resistant nanofiltration membrane wire has good alkali resistance, separation performance and permeation performance.

A demulsifying agent may comprise the structureR1 may be a hydrocarbyl group or heterohydrocarbyl group comprising from 1 to 20 carbon atoms. m may be from 2 to 10, n may be from 5 to 20, and p may be from 2 to 15. R2 may comprise a residue of propylene oxide. R3 may comprise a residue of glycidol. Embodiments of the present disclosure may further comprise methods of making the demulsifying agent and methods of using the demulsifying agent to demulsify a hydrocarbon emulsion.

This invention relates to the field of slow rebound foam technology, and particularly to a slow rebound foam based on waste PET polyether polyol, and its preparation method. The waste PET-based polyether polyol is obtained from bis(2-hydroxyethyl) terephthalamide obtained by aminolysis of waste PET as a starting material. This not only enables the recycling and reuse of waste PET, but also allows it to be used as a foaming material for slow rebound foam. The composite polyether is composed of polyether polyol I, polyether polyol II, waste PET-based polyether polyol, and polymer polyol. By adjusting and controlling parameters such as functionality, molecular weight, hydroxyl value, viscosity, and propylene oxide content of the waste PET-based polyether polyol, it can be stably stored at room temperature without crystallization. When used as the soft segment of slow rebound foam, it significantly improves the low-temperature resistance of the slow rebound foam, avoiding the problems of slow rebound polyurethane foam hardening and becoming difficult to cut in winter, as well as poor resilience.

The invention relates to a method for improving the dewatering performance of organic sludge by using a polyether demulsifier, and belongs to the technical field of municipal sludge treatment. The epoxyethane / epoxypropane block polyether is utilized to effectively destroy a stable oil-water emulsification system in the organic sludge, reduce interfacial tension and promote water release, and the dehydration performance of the organic sludge is remarkably improved by destroying an oil-water interfacial film structure. By utilizing the method disclosed by the invention, the dehydration efficiency of the organic sludge can be remarkably improved, the capillary water absorption time of the sludge and the specific resistance of the sludge are remarkably reduced, the Zeta potential of the sludge becomes closer to a positive value, the median particle size of the sludge is remarkably improved, and the water content of a sludge cake is greatly reduced; the method is easy and convenient to operate, existing dehydration equipment can be directly utilized, and extra investment is not needed; the adding proportion of the demulsifier can be optimized according to actual sludge characteristics, so that the medicament cost is saved; the method provided by the invention provides an economic and efficient technical scheme for organic sludge treatment and disposal, and sludge reduction and recycling can be promoted.

The invention relates to the technical field of preparation of allyl alcohol polyether, in particular to a preparation method of allyl alcohol random polyether. According to the method, allyl alcohol is used as an initiator and is subjected to a polymerization reaction with ethylene oxide and epoxypropane in the presence of a non-metal organic catalyst. The method comprises the following steps: firstly, activating a mixed solution of part of ethylene oxide and propylene oxide, an initiator and a catalyst, then continuously dropwise adding the residual mixed solution into a sealed reaction system for growth polymerization, and finally recovering the catalyst through reduced pressure distillation to directly obtain a high-purity product. The method is simple in process route, avoids complex post-treatment steps such as neutralization and adsorption required by using a noble metal or sodium alcoholate catalyst, is high in catalyst recovery rate, extremely low in potassium and sodium ion content (less than or equal to 3ppm) in the product, and capable of accurately regulating and controlling the molecular weight in a range of 1400-3100, remarkably reduces the production cost, and is suitable for industrial production.

This propylene oxide purification device is provided with a line LX and / or a line LY. The line LX is configured so as to supply a liquid in a first drum D10 to a first distillation column T10 via a feed inlet 10i of the first distillation column T10, and the line LY is configured so as to supply a liquid in a third drum D30 to the first distillation column T10 via the feed inlet 10i of the first distillation column T10.

The invention discloses a safe and efficient epoxypropane saponification reaction device and a safe and efficient epoxypropane saponification reaction method. The saponification reaction device comprises an outer wall, and tower plates, a feeding hole and a discharging hole which are arranged in the outer wall, wherein the top pressure of the saponification reaction device is P1, and the kettle pressure of the saponification reaction device is P2, P2gt; the difference value meets the relational expression of 0 kPad; (1), P2-P1 < = 20 kPa. According to the device, the condition that a saponification reaction device is easy to block is greatly improved, the production efficiency is remarkably improved, and the economic advantage is remarkable. In addition, the saponification reaction device also remarkably improves the safety and reduces the accident rate.

The application relates to the field of lubricating oil, in particular to a high-temperature-resistant high-lubricating stainless steel cutting oil and a preparation method thereof. The cutting oil is composed of base oil, extrusion agent, additive, anti-emulsifier and diluent in specific proportions, wherein the additive comprises polyisobutylene succinic anhydride, amine and propylene oxide polymer, boron-containing compound, basic alkyl salt, imidazoline oleate, antioxidant compound and ethylene-propylene copolymer. By optimizing the proportions of various components and selecting suitable materials, the application can significantly improve the oxidation resistance and cleanliness of the cutting oil, effectively prolong the temperature of the cutting oil in the recycling and reuse process, reduce equipment wear and contamination, and improve the production efficiency of stainless steel.

The invention provides a synthetic method of a novel flame retardant with a phosphaphenanthrene-chloropropyl synergistic structure. The preparation method comprises the following steps: synthesizing bis (1-chloro-2-propyl) phosphoryl chloride from phosphorus oxychloride and epoxypropane in a molar ratio of 1: 2 in a low-temperature condition through a micro-channel reactor, reacting with DOPO-HQ (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl-1, 4-benzenediol), adding a specific solvent and a catalyst, reacting to generate a crude product, filtering, washing, carrying out reduced pressure distillation, and recrystallizing to obtain the 2-(1-chloro-2-propyl) phosphoryl chloride, namely the 2-(1-chloro-2-propyl) phosphoryl chloride-DOPO-HQ (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl-1, 4-benzenediol). The novel flame retardant with the phosphaphenanthrene-chloropropyl synergistic structure is obtained. A phosphaphenanthrene-chloropropyl synergistic structure is designed, so that the molecular weight and the phosphorus content are improved, and the gas-phase flame-retardant and condensed carbon-forming synergistic flame-retardant effect is improved; the thermal stability and the molecular weight are improved through a molecular bridge chain (hydroquinone), and migration is inhibited. The flame retardant has excellent flame retardant property.

The application discloses a "three plugging and one injection" low-temperature epoxy propane efficient gasification fracturing permeability improvement device and method, which comprises five functions of efficient hole sealing, hole cleaning and dust blocking, efficient heating, automatic control and safety and reliability. The device adopts a "three plugging and one injection + slip" technology to block the new fractures around the drilling hole, so that the artificial induced coal seam gas directional flow is realized. The coal seam is fractured by the high-pressure and low-temperature gas generated by the epoxy propane. The coal seam is fractured by the way that the low-temperature epoxy propane is injected into the fractured hole to make the low-temperature epoxy propane gasify. After the high-pressure gas enters the coal body, the high-pressure gas is uniformly distributed in the coal seam, the internal fractures of the coal body are promoted to develop, expand and penetrate, and the permeability of the coal seam is uniformly increased, so that the purpose of efficient fracturing and permeability improvement is realized, and the problem of significant disasters caused by gas over-limit is solved.

The invention provides a bioprosthetic valve material and a preparation method thereof. The preparation method of the bioprosthetic valve material comprises the following steps: carrying out glutaraldehyde crosslinking treatment on a bioprosthetic valve; and placing the bioprosthetic valve subjected to glutaraldehyde crosslinking treatment in an epoxy propane solution for sealed storage. According to the preparation method of the bioprosthetic valve material, the bioprosthetic valve material which is excellent in anti-calcification performance and durability, capable of being stored for a long time and capable of reducing harm to a human body can be prepared.

This invention relates to the field of catalyst technology, and in particular to a MgO nanocluster catalyst, its preparation method, and its application. The preparation method of the MgO nanocluster catalyst involves adding magnesium salt and long-chain diol to a solvent, and then adding a surfactant dropwise. Under heating conditions, the MgO nanocluster catalyst forms a catalyst. Due to its size-driven surface effect, the MgO nanocluster catalyst possesses a large number of oxygen vacancies and low-coordination sites, forming strongly basic catalytic active centers. The MgO nanocluster catalyst is applied to the preparation of dipropylene glycol ethers. Using propylene oxide and alcohol as raw materials, a two-stage series reactor packed with the MgO nanocluster catalyst is used for the reaction. The use of the MgO nanocluster catalyst effectively improves the conversion rate of propylene oxide and the selectivity of primary ethers. Its nanocluster structure makes it easy to separate from the product by physical methods, overcoming the difficulties of traditional heterogeneous catalysts and product separation, significantly improving production efficiency, and showing good industrial application prospects.

The present invention is an evaporation inhibitor for plant treatment agents composed of at least one compound selected from (A1) a compound obtained by adding a predetermined amount of at least one alkylene oxide (hereinafter referred to as AO) selected from ethylene oxide (hereinafter referred to as EO) and propylene oxide (hereinafter referred to as PO) to a predetermined alcohol, (A2) a compound obtained by adding a predetermined amount of at least one AO selected from EO and PO to a predetermined carboxylic acid, (A3) a compound obtained by adding a predetermined amount of at least one AO selected from EO and PO to a monoester of a fatty acid with 10 or more and 20 or less carbons and sorbitan, (A4) a polyalkylene glycol with a weight average molecular weight of 100 or more and 3000 or less, (A5) a predetermined ester compound, and (A6) a predetermined carboxylic acid.

The application discloses a method for preparing 1,2-epoxypropane from propylene, which comprises the following steps: adding ester solvent, catalyst and cocatalyst into propylene, and then introducing air with a pressure of 0.1-2 MPa, and reacting at 25-150 DEG C for 1-24 h to obtain epoxypropane and by-product carboxylic acid compound corresponding to the structure of the ester solvent; the technical scheme provided by the application has simple reaction conditions and is easy to realize, solves the problems of serious three-waste pollution in the traditional method for preparing 1,2-epoxypropane, and effectively improves the selectivity of the method for preparing 1,2-epoxypropane by using air as an oxidant; the by-product carboxylic acid product can be recycled, combined with olefins to return to the ester compound, and the raw material is fully utilized.

This invention discloses a viscosity reducer and a slurry preparation method suitable for preparing coal-water slurry from high-viscosity organic wastewater. The high-viscosity organic wastewater viscosity reducer is prepared by adding naphthoic acid (obtained from methylnaphthalene oxidation) to ethylene oxide and propylene oxide in a certain proportion. The slurry preparation method involves adding sodium naphthalenesulfonate as an additive to the high-viscosity organic wastewater after viscosity reduction to obtain the coal-water slurry. This invention overcomes the disadvantage that high-viscosity organic wastewater is unsuitable for preparing coal-water slurry, successfully using a viscosity reducer to reduce the viscosity of high-viscosity organic wastewater and obtain a high-coal-content coal-water slurry.

The invention provides a polyether prepared by polymerizing an alkylene oxide in the presence of a starter, an aluminum compound having at least one hydrocarbyl substituent, and a cyclic amidine. The amount of the phosphorus-nitrogen base present is in a small molar ratio to the amount of the starter. The presence of such a small amount of the cyclic amidine greatly increases the catalytic activity of the system compared to the use of the aluminum compound alone. The product polyether has a small amount of unsaturated polyether impurities and has little or no undesirable high molecular weight fractions. The proportion of primary hydroxyl groups of the propylene oxide polymer is low.

The application relates to a method for co-producing propylene glycol / dipropylene glycol / polyether 202 and a polyether preparation method, wherein the method for co-producing propylene glycol / dipropylene glycol / polyether 202 comprises the following steps: mixing water and propylene oxide to carry out a hydration reaction to obtain a reaction liquid; the temperature of the hydration reaction is 160 DEG C-240 DEG C, the pressure is 10 MPa-25 MPa, and the molar ratio of water to propylene oxide is (0.08-0.6):1; the reaction liquid is subjected to rectification to obtain propylene glycol, dipropylene glycol and polyether 202 respectively. KOH or NaOH is not needed to be used as a catalyst, that is, neutralization and filtration steps are not needed to be carried out, waste water and filter residue generated due to the neutralization and filtration steps can be effectively avoided, and the risk that polyether 202 contains potassium ions, sodium ions or has an acid value exceeding a standard can be effectively avoided. The polyether 202 obtained by the method has a low acid value, low contents of potassium ions and sodium ions, and can be directly used as a starting agent for preparing polyether; and the obtained propylene glycol and dipropylene glycol have high purity.

The present invention relates to processes for preparing propylene oxide, comprising reaction of propene with ethylbenzene hydroperoxide in the presence of a catalyst, as well as to catalysts employed in such processes and to methods for their manufacture. The catalysts of the invention are prepared in a process comprising sol-gel-synthesis of catalyst hydrogel-precursor, drying of catalyst hydrogel precursor, calcining of dried catalyst hydrogel-precursor, and optionally hydrophobizing the calcined catalyst hydrogel-precursor. The catalysts of the invention comprise amorphous titanium doped silica comprising pentahedrally coordinated titanium species.

The invention relates to a titanium silicalite molecular sieve and a preparation method and application thereof, the method comprises the following steps: S1, mixing titanium silicalite molecular sieve raw powder, a first binder, water and an optional first surfactant, carrying out first molding, and carrying out first roasting treatment on a solid product obtained by the first molding to obtain titanium silicalite molecular sieve microspheres; s2, mixing the titanium silicalite molecular sieve microspheres, a second binder, water and an optional second surfactant, and carrying out secondary molding to obtain a titanium silicalite molecular sieve precursor; s3, performing steam aging on the titanium silicalite molecular sieve precursor to obtain a titanium silicalite molecular sieve pre-product; s4, carrying out secondary roasting treatment on the titanium silicalite molecular sieve pre-product; the mode of the first-time forming is extrusion forming. The titanium silicalite molecular sieve prepared by the method disclosed by the invention has higher mechanical strength and larger specific surface area, and when the titanium silicalite molecular sieve is used for a reaction for preparing epoxypropane, higher epoxypropane selectivity and yield can be obtained.

To provide a shrinkage reducing agent for a geopolymer, which has a high effect of reducing both self-shrinkage and drying shrinkage of the geopolymer and does not need to be used in combination with other components.SOLUTION: A shrinkage reducing agent for a geopolymer, comprising an ether compound which is an alkylene oxide adduct of a monohydric to decahydric alcohol having 3 to 15 carbon atoms, wherein an average number of moles of an alkylene oxide having 2 to 4 carbon atoms added is 1 to 50 moles per mole of the alcohol, and 50 mol% or more of the entire alkylene oxide is propylene oxide.SELECTED DRAWING: None