1023 results about "Propylene oxide" patented technology

The invention relates to the technical field of preparation of surfactants, in particular to a PPO / PEO block Gemini ductile surfactant suitable for high-temperature and high-salt oil reservoirs and a preparation method of the PPO / PEO block Gemini ductile surfactant. The preparation method comprises the following steps: by taking fatty alcohol as an initial raw material, carrying out gradual addition on the fatty alcohol, propylene oxide (PO) and ethylene oxide (EO) through a potassium hydroxide / 18-crown ether-6 catalytic system to prepare an APOnEOm intermediate; the preparation method comprises the following steps: carrying out esterification with a polyethylene glycol bismaleate connecting group, and finally sulfonating with sodium hydrogen sulfite to obtain polyethylene glycol bismaleate diester sodium sulfonate (T-APOnEOm-S). By regulating and controlling the PPO / PEO block ratio, the product has excellent temperature resistance and salt resistance, is suitable for high-temperature and high-salt oil reservoirs, has strong emulsifying capacity, can reduce the oil-water interfacial tension to 10 <-3 > mN / m level, and remarkably improves the oil recovery rate. The preparation process is mild in condition and adjustable in product performance, and has important application value in the field of tertiary oil recovery.

The invention belongs to the field of coal gangue resource utilization, and particularly discloses a method for preparing fiber-reinforced coal gangue-based composite functional aerogel. After being activated, the coal gangue is put into an acid leaching solution to be leached, and an aluminum-rich solution is obtained; adding ammonia water into the aluminum-rich solution to adjust the pH to obtain hydroxide precipitate; adding a sodium hydroxide solution into the precipitate to react to obtain a sodium aluminate solution; neutralizing the sodium aluminate solution with hydrochloric acid to obtain an aluminum chloride solution, stirring to obtain aluminum sol, and adding ceramic fibers into the aluminum sol; violently stirring the sol, and adding epoxypropane to obtain wet gel; after aging the wet gel, carrying out surface modification to obtain hydrophobic coal gangue-based aluminum oxide and composite wet gel of the hydrophobic coal gangue-based aluminum oxide; and drying the modified wet gel at normal pressure to obtain the hydrophobic coal gangue-based aluminum oxide and the composite aerogel thereof. Ceramic fibers are introduced as a reinforcing phase, so that the compressive strength and toughness of the material are improved; the composite aerogel is subjected to surface modification, uniform modification is ensured, the contact angle is remarkably increased, the hygroscopicity is reduced, and the stability of the material is enhanced.

The invention discloses a continuous synthesis and purification method of hexafluoropropylene oxide, which comprises the following steps: introducing hexafluoropropylene, oxygen and a fluorine-containing solvent into a supergravity reactor to carry out oxidation reaction at the reaction temperature of 100-200 DEG C under the reaction pressure of 1.0-2.5 Mpa for 10-120 seconds, and after the reaction is finished, overflowing and leading out reaction liquid to obtain the hexafluoropropylene oxide. And purifying to obtain the hexafluoropropylene oxide. According to the method, the problems of mass transfer and heat transfer can be effectively solved by using the supergravity reactor, the reaction selectivity is remarkably improved, meanwhile, the productivity is effectively improved, and the supergravity reactor is combined with extractive distillation treatment, so that the conversion rate of the hexafluoropropylene reaches 79% or above, the selectivity of the hexafluoropropylene oxide is 85% or above, and the purity of the hexafluoropropylene oxide after extractive distillation reaches 99%. The invention further discloses a device used in the continuous synthesis and purification method, and cyclic utilization of hexafluoropropylene and the fluorine-containing solvent can be achieved.

The invention discloses a low-temperature polyether demulsifier for oil and gas gathering and transportation and a preparation method thereof, and relates to the technical field of petrochemical engineering, and the preparation method is characterized by comprising the following steps: compounding cardanol, pentaethylenehexamine and bisphenol F according to a specific molar ratio to obtain an initiator, and carrying out formaldehyde condensation to prepare a composite initiator; epoxypropane and ethylene oxide are grafted through staged block copolymerization to form a polyether skeleton; introducing a fluorine-containing epoxy monomer to carry out terminal fluorination modification; finally, adipic acid and epichlorohydrin are subjected to chain extension crosslinking, and the demulsifier with the molecular weight being 8000-12000 Da, the fluorine content being 5.5-6.5 wt% and the PDI being smaller than or equal to 1.3 is prepared. The low-temperature demulsifying agent has the effects of realizing efficient demulsification at low temperature, improving the demulsifying efficiency and reducing the dosage through coordination of the composite initiator, super-hydrophobic permeation of the fluorinated block and accurate regulation and control of the molecular weight, solving the problems of low-temperature failure and easiness in emulsification of a traditional demulsifying agent, and meeting the requirements of low-temperature working conditions of oil and gas gathering and transportation.

The invention discloses a bulletproof composite material and a preparation method thereof, and relates to the technical field of bulletproof composite materials. The bulletproof composite material is formed by compounding aramid fibers and a resin matrix, wherein the resin matrix comprises the following raw materials in parts by weight: 60-70 parts of epoxy resin, 5-8 parts of a modified toughening agent, 4-5 parts of a curing agent, 1-2 parts of a heat stabilizer, 1-2 parts of an inorganic filler, 0.5-1 part of a coupling agent and 2-5 parts of a wetting agent; the preparation method comprises the following steps: reacting cyanuric chloride with 4-hydroxyphenylboronic acid to generate an intermediate 1; reacting the intermediate 1 with 3-amino-1, 2-epoxypropane to generate an intermediate 2; reacting the intermediate 2 with cystamine to generate an intermediate 3, and reacting the intermediate 3 with dopamine to generate the modified toughening agent. The bulletproof composite material prepared by the invention has good ballistic protection performance, multiple impact resistance and self-repairing performance.

The invention discloses a composite collecting agent and a preparation method and application thereof, and relates to the technical field of solid waste recycling. The composite collecting agent comprises a main agent, an auxiliary agent and a synergist, and the mass ratio of the main agent to the auxiliary agent is (3-1): (1-2). The mass of the synergist is 0.1%-2.5% of the total mass of the composite collecting agent; the structural formula of the main agent is as shown in formula (I): R-O-C (= S)-NH-R '(I); in the formula (I), R is alkyl, and R'is 3-chloro-1, 2-epoxypropane; the auxiliary agent is a mercaptobenzothiazole derivative. The thiocarbamate and the mercaptobenzothiazole derivative are compounded according to a specific proportion for the first time, a Zn-S shielding layer is destroyed through an intermolecular synergistic effect, and the silver recovery rate is increased; the preparation method is simple and easy to operate, facilitates reduction of the dosage of a single agent and reduces environmental pollution. The foam stability is improved, the flotation efficiency is improved, the selective collection efficiency of the silver-zinc ore is remarkably improved, and the flotation index is improved.

The invention discloses a combined phenol-primary polyamidoamine phenol-amine resin nonionic demulsifier and a preparation method thereof.The preparation method comprises the steps that phenol M and primary polyamidoamine are mixed, a formaldehyde solution is dropwise added, a reaction product is diluted with methyl alcohol, and phenol M-primary polyamidoamine resin slurry is obtained; the preparation method comprises the following steps: mixing organic phenol N and formaldehyde, reacting under the catalysis of sodium hydroxide, and diluting a product with methanol to obtain phenol N phenolic resin slurry; dropwise adding the phenol N phenolic resin slurry into the phenol M-primary polyamidoamine resin slurry, reacting, refluxing to remove methanol and water to obtain combined phenol-primary polyamidoamine resin, and polymerizing the combined phenol (M-N)-primary polyamidoamine resin with epoxypropane and ethylene oxide in sequence under the catalysis of alkali metal hydroxide to generate R-PO-EO diblock demulsifier polyether. And cross-linking with a cross-linking agent to obtain the finished demulsifier. The demulsifier prepared by the invention has the characteristics of high dehydration speed and high final dehydration rate for thick oil emulsion in the Bohai Sea region, and especially can effectively reduce an emulsion layer of output crude oil for thick oil output liquid in a high-water-content exploitation period.

The present invention relates to the field of the preparation of polyurethane elastic fibers, and relates to a preparation method for a bio-based polyurethane elastic fiber, comprising: preparing polyether polyol from sucrose, glycerol, dimethylamine and propylene oxide; adding a solvent, i.e., N,N-dimethylacetamide, and polyether polyol and polyisocyanate into a reaction tank, and adding p-Toluenesulfonyl semicarbazide and aluminum methylenebis(2,4-di-tert-butylphenoxy) phosphate to prepare a spinning solution; and subjecting the spinning solution to spinning and oil application by means of dry spinning technology to obtain the bio-based polyurethane elastic fiber. The present invention ensures that the properties of polyurethane elastic fibers do not deteriorate or are partially enhanced, while the cost and performance advantages are achieved.

The present invention provides a preparation method of high-viscosity hydroxypropyl methylcellulose. A preparation method of high-viscosity hydroxypropyl methylcellulose comprises the following steps: grinding and alkalizing refined cotton cellulose; adding methyl chloride and propylene oxide for etherification reaction; successively adding a crosslinking agent and an aqueous fulvic acid solution for reaction; adding potassium naphthylacetate, sodium sulfite and sodium molybdate and then drying. In the present invention, during the etherification reaction of alkalized cellulose, a crosslinking agent prepared by mixing sodium tetraborate and sodium tripolyphosphate is added for crosslinking reaction, which can reduce the content of water-soluble groups of the prepared hydroxypropyl methylcellulose, achieving the effect of increasing the viscosity of hydroxypropyl methylcellulose. Coating the crop surface with the high-viscosity hydroxypropyl methylcellulose not only has a better surface glazing effect, but also can increase its sugar content.

The invention discloses a preparation method of salt-resistant sodium carboxymethyl cellulose, and relates to the technical field of petroleum fracturing materials. The preparation method comprises the following steps: reacting stearic acid with ethylenediamine to obtain a monosubstituted intermediate, reacting the monosubstituted intermediate with cocoyl chloride to obtain an intermediate 1, reacting the intermediate 1 with epoxypropane to obtain an intermediate 2, and reacting the intermediate 2 with paratoluensulfonyl chloride to obtain a hydrophobic intermediate; reacting a sodium carboxymethyl cellulose solution with the hydrophobic intermediate to obtain modified sodium carboxymethyl cellulose, and sulfonating the modified sodium carboxymethyl cellulose with sulfamic acid to obtain crude salt-tolerant sodium carboxymethyl cellulose; and reacting the crude product salt-resistant sodium carboxymethyl cellulose with borax to obtain the salt-resistant sodium carboxymethyl cellulose. The salt-resistant sodium carboxymethyl cellulose prepared by adopting a step-by-step synthesis strategy has excellent salt resistance, temperature resistance, shearing resistance and dissolution rate, and is suitable for thickening and sand carrying of high-temperature and high-salt oil and gas field fracturing fluid.

The invention belongs to the technical field of lithium batteries, and particularly relates to a composite defoaming agent as well as a preparation method and application thereof. The composite defoaming agent comprises an epoxypropane-ethylene oxide segmented copolymer, a ZIF-8 packaging material, a temperature-sensitive copolymer and a conductive synergist, the ZIF-8 packaging material comprises ZIF-8 and a modified organic silicon polymer packaged in the ZIF-8, and the modified organic silicon polymer contains fluorine ions. According to the invention, the ZIF-8 packaging material and the thermo-sensitive copolymer are adopted, and other components are combined, so that the gas content of the negative electrode slurry and the resistance amplification of a pole piece can be reduced, and the storage stability, the thermal stability and the defoaming response efficiency can be improved; the defoaming agent has a good defoaming effect and a slow release effect, can inhibit thermal migration, and avoids interface resistance rise and phase separation.

The invention relates to the technical field of anti-yellowing, in particular to anti-yellowing lining cloth with a hot melt coating and a preparation method of the anti-yellowing lining cloth. Composite carbon dots, an anti-yellowing agent and a composite chitosan solution are adopted to prepare finishing liquid for finishing the lining cloth; the preparation method comprises the following steps: selecting furfural and urea as a carbon source and a nitrogen source, performing one-step hydrothermal synthesis to obtain a nitrogen-doped furfural-based carbon dot, and grafting an amino-terminated polyimidazolium salt antibacterial compound to obtain a composite carbon dot; wherein the amino-terminated polyimidazolium salt antibacterial compound is an amino-terminated halogen-free polyimidazolium salt antibacterial compound which is prepared by taking ethylenediamine, butyric acid, glyoxal and formaldehyde as raw materials based on amine-aldehyde polycondensation and has good biocompatibility; the preparation method comprises the following steps: by taking polybutylene adipate, toluene diisocynate and isophorone diisocyanate as main monomers, polypropylene oxide triol as a crosslinking monomer, 2, 2-dimethylolpropionic acid and 4, 4 '-diaminodiphenyl disulfide as chain extenders and composite carbon dots as an end-capping reagent, adding water and emulsifying to obtain the waterborne polyurethane hot melt adhesive.

The invention provides a preparation method and application of low-bath-ratio and high-viscosity hydroxypropyl carboxymethyl composite starch ether, and relates to the technical field of starch deep processing. The method comprises the following steps: S1, premixing corn starch with a compound base catalyst and magnesium stearate, and spraying an ethanol water solution for alkalization; s2, adding epoxypropane to carry out first-stage etherification, and then adding sodium chloroacetate to carry out second-stage etherification; and S3, after the reaction is finished, performing vacuum drying, crushing and sieving to obtain the high-viscosity hydroxypropyl carboxymethyl composite starch ether. Wherein the composite alkali catalyst comprises sodium hydroxide, sodium carbonate and calcium oxide. The starch ether obtained by the method has the advantages of high substitution degree, high viscosity, low solvent consumption and low energy consumption, and overcomes the defects of the traditional semi-dry method.

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 invention relates to an aliphatic copolyester elastomer and a preparation method thereof, and belongs to the field of high polymer materials. The elastomer is prepared through a series ring-opening copolymerization reaction of epoxide and cyclic anhydride, and the method comprises the following steps: under the action of a metal-free catalyst (a phosphazene ligand P1-tert-octyl / triethyl boron system) and an initiator (terephthalyl alcohol), carrying out a series ring-opening copolymerization reaction on epoxide and cyclic anhydride, the preparation method comprises the following steps: reacting epoxide (such as epoxypropane and allyl glycidyl ether) with aliphatic anhydride (such as glutaric anhydride) in a xylene solvent to generate a polyester prepolymer retaining an active end; adding a second group of epoxide (such as cyclohexene oxide) and anhydride (such as tetrahydrophthalic anhydride and norbornene dianhydride), continuously reacting to form a block copolymer, and then crosslinking. The material performance can be regulated by changing the monomer combination, the atom economy is high, and the raw materials can be produced on a large scale. The process is simple and environment-friendly, and a new choice is provided for application of the degradable elastomer in the fields of medical treatment, environmental protection and the like.

The invention provides bisphenol A polyoxypropylene ether and a preparation method thereof. The bisphenol A polyoxypropylene ether is prepared from bisphenol A, epoxypropane and a modified chain extender, the modified chain extender is obtained by modifying pentaerythritol with a compound containing nitryl, phenyl, halogen atoms and silane; the chain extender is beneficial to improving the rebound resilience of a polyether system, and the branched structure increases the volume / mass ratio and is beneficial to light weight; according to the bisphenol A polyether, the NO2 group has a certain self-extinguishing property, and the combination of aryl, F and Si has a good synergistic flame-retardant effect, so that a positive contribution is made to the flame-retardant property, and especially in the aspects of forming a stable carbon layer and suppressing smoke, the sealing, rebounding, flame-retardant and lightweight properties of the bisphenol A polyether are synergistically improved.

The invention belongs to the technical field of antibacterial polyurethane, and particularly relates to a preparation method of antibacterial polyurethane foam. The preparation method comprises the following steps: (1) adding 0.5-1 part by weight of water, 1-3 parts by weight of a catalyst, 1-6 parts by weight of a foam stabilizer and 0.5-1 part by weight of an inorganic antibacterial filler into 100 parts by weight of antibacterial polyether under the condition of 25-35 DEG C to obtain a combined material; (2) adding 100-110 parts by weight of polyisocyanate into the combined material obtained in the step (1) under the condition of 25-35 DEG C, stirring, foaming and curing to obtain polyurethane foam; the number-average molecular weight of the antibacterial polyether is 550-650, guanidine hydrochloride, cane sugar, diethylene glycol and ethidene diamine are used as initiators and react with epoxypropane to prepare the antibacterial polyether, and the mass fraction of epoxypropane in the antibacterial polyether is 75-80%. The foam prepared by the method is high in strength and high in antibacterial property.

The present application relates to the technical fields of propylene epoxidation catalyst, and discloses a propylene epoxidation catalyst, characterized in that the propylene epoxidation catalyst comprises a hierarchical pore titanium silicalite molecular sieve and nano gold loaded on the hierarchical pore titanium silicalite molecular sieve; wherein the content of the nano gold is 0.01wt%-1wt% based on the total amount of the propylene epoxidation catalyst; wherein the total pore volume of the propylene epoxidation catalyst is 0.18-0.56cm 3 / g, the particle size is 100-250nm, and the crystallinity is greater than or equal to 50%. By loading nano gold particles on the titanium silicalite molecular sieve with specific physical parameters under the condition of inert gas pressurization, the obtained catalyst has high catalytic activity when applied to propylene gas phase epoxidation reaction, the propylene conversion rate is increased to 10%-20%, and the selectivity of propylene oxide is increased to 90%-95%.

The invention discloses a demulsifier for a heavy oil field and a preparation method of the demulsifier. The preparation method comprises the following steps: reacting an amine compound with benzyl glycidyl ether and allyl glycidyl ether to obtain a multi-aromatic-ring initiator, then polymerizing the multi-aromatic-ring initiator with epoxypropane and ethylene oxide to form a demulsifier polyether, and carrying out crosslinking modification to obtain a multi-aromatic-ring demulsification component A; synthesizing oleylamine polyether, and modifying to generate a dispersing aid component B which contains oil carboxyl and is of a comb-like structure; the demulsifier for the heavy oil field is prepared from the component A and the component B according to the ratio of 6: (1-2). The demulsifier for the heavy oil field prepared by the preparation method has the advantages of low dosing concentration, good dehydration effect, neat dehydration interface and clear dehydrated water.

The invention provides a viscosity reduction type water reducer as well as a preparation method and application thereof. The water reducer is prepared by the following steps: firstly, alternately polymerizing styrene and maleic anhydride to obtain a low-molecular-weight styrene-maleic anhydride polymer, and then respectively grafting a phosphonic acid monomer and a polyether monomer into a main chain of the styrene-maleic anhydride polymer through reaction, the number average molecular weight of the styrene-maleic anhydride polymer is 1000 to 2000. Through an esterification reaction, a phosphonic acid monomer and a polyether monomer are grafted to a main chain formed by a styrene-maleic anhydride alternating polymer, and a phosphonic acid group and a hydrophobic epoxypropane structural unit are introduced into a water reducing agent structure, so that the surface tension of the water reducing agent is further reduced; the wetting effect and a certain air entraining effect of the water reducing agent on cement particles are improved, the sliding resistance among the cement particles is reduced, and the viscosity of concrete is reduced to a certain extent.

The invention belongs to the technical field of cables, and particularly relates to a weather-proof new energy automobile charging cable which is composed of a cable core, a shielding layer wrapping the cable core and a sheath layer wrapping the shielding layer. Each cable core is composed of a conductor and an insulating layer. The invention discloses a preparation method of a traditional Chinese medicine. A sheath layer of the weather-resistant new energy automobile charging cable is prepared from 70 to 90 parts of thermoplastic elastomer (TPE), 20 to 30 parts of lignin, 25 to 30 parts of propylene oxide, 20 to 25 parts of furfuryl alcohol, 2 to 5 parts of 4-chloromethyl styrene, 1.5 to 3 parts of tetrabutyl ammonium hydroxide, 5 to 6 parts of methylbenzene, 10 to 25 parts of methyl tert-butyl ether, 45 to 7 parts of anhydrous MgSO4, 0.5 to 2.5 parts of initiator, 2 to 3 parts of cross-linking agent, 5 to 8 parts of metal salt additive and 1 to 3 parts of lubricant. 0.3 to 0.6 part of antioxidant and 3 to 4 parts of color master batch.

The invention relates to the technical field of petrochemical engineering, in particular to a continuous production method of high-stability N-methyldiisopropanolamine. The method comprises the following steps: heating and reacting methylisopropanolamine and propylene oxide under the action of a specific catalyst to generate an N-methyldiisopropanolamine crude product; then adding the crude product into a rectifying tower, and extracting a high-purity N-methyldiisopropanolamine product from a side line at the middle upper part; the used catalyst is citric acid modified zeolite loaded copper-chromium bimetal. According to the production method disclosed by the invention, by optimizing an active site structure and a rectification separation path of the catalyst, efficient and stable operation of a reaction process is realized, and the thermal stability of a final product is remarkably improved.

The invention relates to the technical field of preparation of propylene carbonate, and discloses a solid bifunctional catalyst as well as a preparation method and application thereof. The solid bifunctional catalyst comprises a titanium silicalite molecular sieve and alkaline earth metal oxide loaded on the titanium silicalite molecular sieve. By adopting the solid bifunctional catalyst, propylene carbonate can be directly and continuously synthesized from propylene, an oxidizing agent and CO2 through one-step reaction. The technical process is obviously simplified, the links of separation, purification, storage and transportation of epoxypropane are cancelled, and the production efficiency is improved through continuous production; the process energy consumption is obviously reduced, and the economical efficiency of the whole process is improved.

The invention provides a green and efficient production method of hexafluoropropylene oxide, and belongs to the technical field of synthesis of organic fluorine compounds. The method comprises the following steps: carrying out a continuous oxidation reaction on hexafluoropropylene, oxygen and a perfluoro solvent in an immersed supergravity reactor to generate HFPO and byproducts carbonyl fluoride and trifluoroacetyl fluoride, removing the solvent from the reacted liquid, feeding the liquid into an acyl fluoride rectifying tower, separating low-boiling-point acyl fluoride from the tower top, enriching HFPO, unreacted HFP and a small amount of acyl fluoride from the tower bottom, and carrying out a continuous oxidation reaction on the HFPO and the byproducts carbonyl fluoride and trifluoroacetyl fluoride. Converting acyl fluoride into anhydrous trifluoroacetic acid from a high-boiling-point substance at the bottom of the tower through a hydrolysis tower, carrying out alkali washing on the synthesis gas to obtain an HFPO crude product, and further carrying out drying and extractive distillation to obtain an HFPO product; acyl fluoride rectified by an acyl fluoride rectifying tower is directly used for producing PAVE, and long-chain perfluoroacyl fluoride accumulated in a solvent of oxidation reaction is hydrolyzed to synthesize a non-PFOA emulsifier. The method has the advantages of high HFPO selectivity, short reaction time and high safety; the method realizes resource comprehensive utilization of byproducts, and is environment-friendly and economical.

The invention discloses a preparation method and application of a dendritic block polyether surfactant, and relates to the technical field of polyether surfactants. The invention relates to a preparation method of a dendritic block polyether surfactant, which comprises the following steps: (1) mixing pentaerythritol, a glycidyl ether compound and a catalyst A, heating, stirring and mixing, and carrying out heat preservation reaction to obtain a reaction product; (2) adding a catalyst B into the reaction system in the step (1), adjusting the temperature of the system, introducing nitrogen to replace air in the reaction system, and carrying out aging reaction after feeding is finished; and heating, maintaining the pressure of the system at 0.25-0.3 MPa, adding ethylene oxide, and continuing the aging reaction after the feeding is finished, thereby obtaining the dendritic block polyether surfactant. According to the invention, epoxypropane, ethylene oxide and pentaerythritol are adopted to form a tree-shaped high-performance block polyether surfactant, so that the problems that the emamectin benzoate water suspending agent is easy to be subjected to Ostwald ripening during sanding, easy to separate out during heat storage, easy to grow and the like are solved.

The invention belongs to the technical field of preparation of molecular materials and adhesive tapes, and discloses a degradable mylar adhesive tape and a preparation method thereof, the degradable mylar adhesive tape comprises a degradable base material layer and a degradable adhesive layer; the degradable base material layer is prepared from the following raw materials in parts by mass: 25-35 parts of poly (butylene succinate) (PBS), 20-30 parts of polylactic acid (PLA), 10-15 parts of polycaprolactone (PCL), 8-12 parts of modified bamboo fiber powder, 3-5 parts of a compatibilizer and 0.5-1 part of an antioxidant; the degradable adhesive layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of a modified starch-based adhesive, 15 to 25 parts of poly (butylene adipate-co-terephthalate) (PBAT), 10 to 15 parts of polyhydroxyalkanoate (PHA), 5 to 8 parts of sodium alginate-chitosan composite gel, 5 to 8 parts of an epoxypropane modifier, 1 to 2 parts of a cross-linking agent and 0.3 to 0.5 part of a de-foaming agent; by optimizing the raw material composition and the preparation process of the base material and the adhesive, the full-life-cycle degradability of the adhesive tape is realized, and meanwhile, excellent mechanical properties, insulativity and temperature resistance are ensured.

The invention discloses a synthesis method of low-molecular-weight perfluoropolyether acyl fluoride, which comprises the following steps: hexafluoropropylene, oxygen, a catalyst and a fluorine-containing solvent are subjected to an oxidative polymerization reaction, the reaction liquid is subjected to light component removal and solvent removal to obtain the low-molecular-weight perfluoropolyether acyl fluoride, and the temperature of the oxidative polymerization reaction is 130-300 DEG C. According to the invention, hexafluoropropylene is used as a raw material and is oxidized by oxygen in a fluorine-containing solvent, so that low-component perfluoropolyether acyl fluoride is synthesized in one step. In the presence of a catalyst, formyl fluoride, trifluoroacetyl fluoride and hexafluoropropylene oxide continue to be added into an oligomer, and the oligomer is mainly perfluoropolyether acyl fluoride with a straight-chain structure. And when the reaction temperature is within the range, the smooth proceeding of the oxidative polymerization reaction can be ensured, the sharp rise of the reaction pressure caused by the overhigh reaction temperature can be avoided, and the model selection of reaction equipment is convenient.

The invention relates to a preparation method of a low-temperature crude oil demulsifier, which comprises the following specific steps: preparing block polyether by using propane diamine as an initiator and using epoxypropane and ethylene oxide as main agents, then grafting by using an organic silicon chain, and modifying by using isocyanate. The invention also relates to a low-temperature crude oil demulsifier. Compared with the prior art, the invention has the following beneficial effects: according to the technical scheme, isocyanate is used for modifying the whole block polyether molecular chain, the demulsification effect of the demulsifier can be obviously improved, and meanwhile, after organic silicon and isocyanate are used for modification, the application temperature of the demulsifier is positively influenced; the low-temperature crude oil demulsifier prepared by adopting the preparation method disclosed by the invention is high in demulsification speed and good in demulsification effect under a normal-temperature condition and can be applied to scenes with high temperature rise difficulty, high demulsification speed requirement and high demulsification performance requirement, and the adopted raw materials are low in price, simple in synthesis method and convenient for large-scale popularization.

The invention belongs to the field of electrolyte, and particularly relates to cyclic carbonate for electrolyte and a preparation method thereof and electrolyte, and the preparation method of the cyclic carbonate for electrolyte comprises the following steps: adding a porous carbon nanomaterial as a catalyst and epoxide into a reaction kettle, and introducing CO2 for reaction to obtain the cyclic carbonate. The metal oxide modified nitrogen-doped porous carbon nanomaterial with a high specific surface area is designed and developed to catalyze CO2 and epoxide to synthesize the cyclic carbonate for the electrolyte, the cyclic carbonate for the electrolyte is prepared by catalyzing carbon dioxide under a mild condition, and on the basis of ensuring the high content of the cyclic carbonate, the epoxypropane conversion rate is 99.9%; the reaction time is shortened, the purity of the obtained cyclic carbonate product is 99.9%, and the method is suitable for industrial production.

The invention provides a preparation method of an oil-resistant and wear-resistant coating for the surface of an antenna tube, and belongs to the technical field of composite coatings. The preparation method comprises the steps of primer spraying, polyurea coating spraying and aftertreatment. In the step of preparing the primer, epoxy resin HY01A and epoxy resin HY01B are mixed to obtain the primer; a preparation method of the epoxy resin HY01A comprises the following steps: adding bisphenol A epoxy resin and propylene oxide butyl ether into a reaction kettle, stirring at 40-50 DEG C to obtain homogeneous liquid, and carrying out vacuum defoaming to obtain the epoxy resin HY01A; the preparation method of the epoxy resin HY01B comprises the following steps: stirring cashew nut shell oil modified amine in a mixed solvent, after the cashew nut shell oil modified amine is completely dissolved, adding a kH550 silane coupling agent, and stirring for 28-34 minutes to obtain the epoxy resin HY01B. The coating prepared by adopting the preparation method disclosed by the invention has the advantages of strong binding force with an antenna tube substrate, excellent elastic property, good oil resistance and wear resistance and strong applicability in a complex environment.