934 results about "Salt resistance" patented technology

The invention relates to an oil-displacing agent for enhancing crude oil recovery efficiency in tertiary recovery and a preparation method thereof, belonging to the technical field of intensified oilproduction in oil fields. The surface active agent used in the invention comprises following components in percentage by weight: 0.01-0.3 percent of water soluble high molecular polymer, 0-20 percentof non-ionic surface active agent, 5-65 percent of anion active agent, 0-5 percent of ampholytic active agent, 0.01-1.5 percent of additive and the balance of water. The oil-displacing agent and the polymer are based on a novel intensified oil displacing system which has complementary structure and good compatibility and is obtained by various associations and the interaction among molecules. Thesystem has the performances of high temperature resistance, salt resistance, higher viscosity, ultralow interfacial tension, and the like, is in accordance with the environmental requirement and can obviously enhance the oil recovery efficiency of oil fields after being used for oil-displacing.

The invention discloses an acrylamide modified graft copolymer and a preparation method and usage thereof. The invention is characterized in that 20 parts of acrylamide, 1-20 anionic monomer and/or cationic monomer, 0.1-15 macromonomer, 0.05-10 ionic lyophobic monomer and 50-1000 deionized water are added into a three-necked reaction bottle, the pH value is adjusted to be 3-9, N2 is introduced for 30min, then 0.002-0.5 part of initiator persulfate is added at 30-75 DEG C, the reaction lasts 8-36h, then copolymer PAB is obtained, and finally water is used for dilution to obtain strong PAB solution. During polymerization, no surfactant is used, and the macromonomer with a long chain and the ionic lyophobic monomer with intermolecular association function are introduced into the copolymer PAB, so the capabilities of cooperative tackification and salt-resistance between the rigid conformation of a molecular chain and the intermolecular association can be played optimally, the PAB exhibits unique solution property and has higher colloidal viscosity in high saline solution than in fresh water, and the PAB obtains the capabilities of tackification, salt resistance, low surface tension and strong molecular association and can be used for the oil-displacing acrylamide modified graft copolymer. The copolymer is prepared into water solution with mass concentration of 0.2-3.0g/L and surfactant concentration of 0.01-2 mmol/L, then the water solution is added into a mixing vessel by a stirring device, and then a polymer oil-displacing agent with tackification, salt resistance and cutting resistance is obtained. The PAB has the functions of both a tackifier and a macromolecule surfactant. The copolymer PAB is prepared into water solution which has mass concentration of 0.05-7%, so the macromolecule surfactant with excellent surface activeness can be obtained and then applicable to an emulsifier, an emulsion splitter, a solubilizer and a wetting agent.

The invention provides association-type non-crosslinking fracturing fluid and a preparation method thereof. The association-type non-crosslinking fracturing fluid is prepared from hydrophobic modified partial hydrolytic polyacrylamide and derivatives of the hydrophobic modified partial hydrolytic polyacrylamide serving as active ingredients, a gel breaker, potassium chloride, an optional surface active agent and water, wherein each of the molecular structures of the hydrophobic modified partial hydrolytic polyacrylamide and the derivatives of the hydrophobic modified partial hydrolytic polyacrylamide contains acrylamide monomer unit, at least one biparental unsaturated monomer unit and at least one an anion alkene unsaturated monomer unit. As the molecular structure of a thickening agent contains a biparental monomer unit, a reversible super-molecule network can be formed in an aqueous solution through intermolecular hydrophobic association, and the high viscosity and the suspending power required by the fracturing fluid can be obtained without needing chemical crosslinking. The association-type non-crosslinking fracturing fluid based on the thickening agent has the characteristics of simple composition, low residue content, low damage, low friction, shear resistance, temperature resistance and salt resistance and can turn into a new generation of fracturing fluid system for replacing guanidine gum and fracturing fluid thereof.

The invention discloses a non-linear associated water soluble quadripolymer as well as a preparation method and use thereof, comprising: adding 20 parts of acrylamide, 1-20 parts of nionic monomer or/and cationic monomer, 0.1-15 parts of macromonomer, 0.05-10 parts of hydrophobic monomer, 0.1-50 parts of surfactant and 60-1000 parts of deionized water to a three-necked reaction flask, adjusting the pH to be 3-9, adding 0.002-1 part of initiator (persulphate) at 30-75 DEG C after introducing N2 for 30min, reacting for 8-36h to obtain the quadripolymer PACH, diluting with water, and obtaining concentrated PACH solution. The macromonomer with a long chain and the hydrophobic monomer with a molecular association function are simultaneously introduced in a copolymer PACH, which can obtain the best synergistic viscosifying between rigid conformation of a molecular chain and molecular association and salt resistance. The non-linear associated water soluble quadripolymer is obtained. The copolymer is prepared into aqueous solution with the mass concentration of 0.2-3g/l and the surfactant concentration of 0.01-2mmol/l, added to a mixing vessel with a stirring device and evenly stirred at the room temperature to obtain a viscosified, salt-resistant and shear-resistant polymer oil displacement agent. The PACH has dual functions of a viscosifier and a high molecular surfactant; minute amount of a low molecular surfactant is added to the PACH solution, thus improving the apparent viscosity of the solution, reducing the surface tension of solution and the water-oil interfacial tension, and being beneficial to improving the crude oil recovery ratio. A copolymer PABE is prepared into the aqueous solution with the mass concentration of 0.05-7% to obtain high molecular surfactant with excellent surface activity, and the high molecular surfactant is used as an emulsifier, a demulsifier, a solubilizer and a wetting agent.

The invention discloses a comb-type structural reactive polymer with the molecular weight ranging between 1x10<5> and 5x10<6>, wherein the main chain of the reactive polymer is obtained through the copolymerization of acrylamide monomer and functional monomers such as 2-acrylamido-2-methylpropanesulfonic acid and acrylic acid sodium salt, etc., which endues polymer aqueous solution with higher apparent viscosity and better temperature resistance and salt resistance; and the branched chain of the reactive polymer consists of unsaturated macromonomer molecule, which endues the polymer aqueous solution with higher surface activity. The invention also discloses a preparation method for the polymer, comprising the following steps: firstly, through process operation including esterification, prepolymerization and sulfonation, polyurethanes active macromonomer with a novel structure is prepared; then, under the action of oxidation reduction initiator, the copolymerization reaction of the active macromonomer and other functional micromolecule monomers is initiated quickly at low temperature. The comb-type structural reactive polymer can be used as oil displacement agent and has the advantages of high molecular weight and low surface tension, etc.

The invention relates to a method for preparing a fluorine-containing modified amphoteric water-soluble polymer, in particular to a method for preparing the fluorine-containing modified amphoteric water-soluble polymer by a cosolvent method and belongs to the technical field of water-soluble macromolecular synthesis. Methacryloyl ethyl-N and N-dimethyl propanesulfonic acid (DMAPS) as amphoteric monomers and perfluoro hexyl ethyl acrylate (PFHEA) and acrylamide (AM) as hydrophobic monomers are copolymerized in a single solvent; azobisisobutyronitrile (AIBN) is used as a catalyst; and the fluorine-containing modified amphoteric water-soluble polymer is obtained. The polymer has good water solubility and remarkable interface activity, thickening, shearing resistance, temperature resistance and salt resistance. Through a mixed solution of anhydrous acetone and anhydrous ether, the polymer is precipitated, dried and pulverized to obtain a powdery product; and the powdery product has wide application prospect in the development of an oil field, dope, printing, household chemical, medicament and other fields.

The invention relates to a temperature and salt resistant copolymer KWKY-PAD for oil field and a preparation method thereof, and mainly solves the problem that polyacrylamide is easy to hydrolyze at high temperature and high salinity in the prior art. The temperature and salt resistant copolymer KWKY-PAD as shown in formula (I) is obtained by the copolymerization of acrylamide and a N-alkyl substituted acrylamide derivative. The technical scheme provided by the invention greatly solves the problem. By the adoption of the preparation method, the hydrolytic stability of the copolymer is raised,and the copolymer has good viscosifying ability and hydrolytic stability at high temperature and high salinity as well as good temperature and salt resistance. The copolymer provided by the inventioncan be used in an oil displacement agent for oil extraction in oil field, and also can be used in oil field application fields of a thickening agent of fracturing fluids, a water plugging profile modification agent, a drilling fluid processing agent and the like. In addition, the preparation method requires less monomer, is simple and is suitable for industrialization.

The invention relates to a salt- and temperature-resistant emulsification viscosity reducer for thick oil. The emulsification viscosity reducer is applied in oil fields for emulsification viscosity reduction of heavy oil and super heavy oil and is characterized by comprising the following components by mass: 1 to 5 parts of sulfonate anionic surfactant, 0.2 to 1 part of disodium monolauryl sulfosuccinate, 0.2 to 1 part of polyoxyethylene nonylphenyl ether disodium monoester sulfosuccinate, 0.7 to 2 parts of polyoxyethylene ether ester salt, 1 to 3 parts of polyoxyethylene nonylphenyl-polyoxypropylene alcohol ether block copolymer, 0.5 to 1 part of carboxymethyl polyoxyethylene ether, 0.5 to 1 part of organic amide polyoxyethylene ether, 0.7 to 2 parts of polyoxyethylene polyoxypropylene polyethylene polyamine, 0.5 to 1 part of sulfonate polyacrylamide, 0.1 to 0.7 part of nonionic fluorocarbon surfactant, 0.2 to 0.5 part of a modification nanometer auxiliary agent, 0.3 to 1 part of an alkalescence auxiliary agent and 10 to 200 parts of water. The beneficial effects of the emulsification viscosity reducer are as follows: salt resistance is up to 24*10<4> mg/L, resistance to a temperature as high as 150 DEG C is realized, and emulsification viscosity reduction of super heavy oil with a viscosity of 500 Pa.s at a temperature of 50 DEG C is realized.

The invention provides a method for preparing salt-resistant stain-resistant bentonite with adsorption function. The method comprises the following steps: performing sodium treatment, namely milling natural calcium bentonite to pass through a sieve with the granularity of 50-150 meshes, adding the bentonite into an aqueous solution of a sodium treatment agent, stirring, performing sodium treatment and reacting at the temperature of 50-90 DEG C for 1-4 hours, and drying to obtain sodium-based bentonite; and modifying, namely milling the sodium-based bentonite to pass through a sieve with the granularity of 150-250 meshes, drying and mixing with a modifier at normal temperature, and obtaining the product. The bentonite prepared by the method is high in expansibility, has high salt resistance, high stain resistance and good adsorption performance, can be used for underground seepage prevention of high salinity complex water bodies and also can be used for treating heavy metal ions and organic pollutants in contaminated water.

The invention relates to a surface treatment method of aluminum alloy, which comprises the following steps of: pre-treating: removing oil stains on the aluminum alloy surface by adopting an alkali degreasing solution; alkali washing: purifying the aluminum alloy surface at 50-60 DEG C by adopting alkali wash to remove a natural oxide film on the aluminum alloy surface; acid pickling: treating the aluminum alloy surface at room temperature for 1-5 minutes by adopting a pickling solution to further remove residual spots left on the aluminum alloy surface after alkali washing; and chemically plating Ni-P: forming a Ni-P plating layer on the aluminum alloy surface by adopting a pre-prepared chemical plating Ni solution with pH value of 5-6.5 at 85-90 DEG C for 90-240 minutes. By adopting a chemical plating Ni-P layer process to form a uniform favorable plating layer with good acid resistance, alkali resistance and salt resistance outside an aluminum alloy shell, the invention avoids the phenomena of uneven thickness of a protective layer and spraying missing on a complex structure part, and remarkably improves the anticorrosion performance of the aluminum alloy.

The invention discloses an epoxy ester modified aqueous alkyd resin and a preparation method thereof. The method comprises the following steps of: preparing alkyd resin, synthesizing epoxy ester, and synthesizing the epoxy ester modified aqueous alkyd resin: stirring and mixing epoxy ester and basic alkyd resin in mass ratio of 0.2:1-0.5:1, 1-3 parts of organic tin catalyst and 5-15 parts of dimethyl benzene, and performing reflux reaction at the temperature of 180 DEG C for 1-2 hours until the acid value is measured to be less than 7mgKOH/g; and water-dissolving the modified alkyd resin. A product provided by the invention keeps superior performances of paint dryness, glossiness, durability, flexibility, hardness, higher solubility and the like of the alkyd resin, has superior cohesive property, salt fog resistance and good self-drying property of the epoxy resin, and can keep that a coating has superior solvent resistance and chemical resistance.

The invention discloses a polyacrylamide inorganic nano composite material prepared by adopting a polymerization composite method of polyacrylamide and nano inorganic phase and a drilling fluid aid. The inorganic material is nano dispersed suspension formed by co-precipitation hydrothermal reaction and surface treatment reaction of laminated silicate, nitrate or the both. The suspension is mixed with acrylamide aqueous solution, cosolvent and complexing agent; and the mixture is polymerized under the initiation of persulfate and sulfite to form the polyacrylamide nano composite material with proper molecular weight, good water solubility and good tackifying effect, wherein the dimension of the inorganic phase is 30 to 70 nanometers. The drilling fluid prepared from the composite material has remarkable viscosity increment, good rheological property and filtration control, temperature and salt resistance and protection property on a reservoir layer, and improves the yield and recovery rate.

The invention relates to a carbon dioxide foam system added with hydrophilic nanoparticles for oil displacement and a preparation method for the carbon dioxide foam system. The carbon dioxide foam system is prepared from the following components in parts by mass: 0.1-0.3 part of a nonionic surfactant, 1-2 parts of hydrophilic nanoparticles, 0.01-0.2 part of inorganic salt, 0.2-0.8 part of carbon dioxide and 100 parts of water. The preparation method comprises: after preparing a foaming agent in proportion, uniformly dispersing the foaming agent by using an ultrasonic wave dispersing instrument; and introducing carbon dioxide into a stirring cup and stirring the mixture by virtue of a Waring Blender method to obtain the carbon dioxide foam system. Compared to carbon dioxide foam generated by a common surfactant, the carbon dioxide foam added with hydrophilic nanoparticles is better in temperature resistance and salt resistance, and compared to a foaming agent added with hydrophobic nanoparticles, the carbon dioxide foam system is low in cost and good in dispersing stability and is more liable to be popularized and applied in a field site.

The invention relates to a synthetic method of a salt tolerant quadripolymer superabsorbent resin, comprising the following steps of: adding cyclohexane and a dispersant Span-80 into a 3-mouth flask, stirring and heating up to the temperature of 60-68 DEG C, dropwisely adding a hydrophilic cross-linking agent, an initiator and a comonomer by a constant-voltage titration tunnel, staying at constant temperature for 1 hour after the addition, heating up to the temperature of 70-75 DEG C and reacting for 2-3 hours, cooling to room temperature, pouring the obtained product into a beaker with enough methanol, fully depositing, followed by pumping filtration by a vacuum pump, repeatedly washing by the use of methanol, and drying in a vacuum chamber at the temperature of 80-90 DEG C to obtain a white powder, namely the salt tolerant quadripolymer superabsorbent resin. The invention has the following beneficial effects: the technology is simple; the requirement on equipment is low; the resin prepared by the synthetic method has strong water absorption, fast water absorption rate, excellent water retention, high strength in the superabsorbent state, good light and thermal stability as well as salt tolerance which is remarkably improved.

The invention discloses a nano silicon dioxide/polymer oil-displacing agent and a synthesizing method thereof. The oil-displacing agent is a terpolymer consisting of the following raw materials in percentage by mass: 60.5 to 69.9 percent of acrylamide, 30 to 35 percent of crylic acid, and 0.1 to 4.5 percent of nano silicon dioxide functional monomer. The synthesizing method comprises the following steps of: adding the nano silicon dioxide functional monomer, the acrylamide and the crylic acid into a three-neck flask; regulating the pH value to 7.0-7.5 with sodium hydroxide solution to prepare solution with the monomer total mass concentration of between 10 and 20 percent, and introducing nitrogen for 40 minutes; introducing an initiator, and reacting for 4 to 8 hours at 30 to 55 DEG C; and cleaning with absolute ethanol, baking and crushing to obtain terpolymer. The oil-displacing agent is strong in anti-shearing performance, and excellent in temperature and salt resistance.

The invention provides polymer microspheres for high temperature hypersalinity reservoir deep profile control and a preparation method thereof. In the method, based on the method that photopolymerization is used to prepare the polymer microspheres, heat and salt resistance polymer materials such as sodium 3-acryloylamino-3-methyl butyrate, 2-acryloylamino-2-methylpropane sulfonic acid, acrylamide monomer and the like and water-soluble anionic monomer are adopted and dispersant and cross-linking agent are added as so to form oil-water mixed emulsion in the mixed medium of surfactant and solvent; then initiator is decomposed by ultraviolet through photopolymerization under controllable temperature so as to initiate emulsion polymerization and 50-500nm of microspheres are formed. The invention utilizes the ability of microspheres that microspheres can be dispersed in arbitrary concentration and injected in the water and can gradually swell after entering in depth of the formation to plug the pore throat so as to effectively plug the high permeable strip of the formation, expand the water swept volume, significantly increase crude oil recovery of water flooding reservoir and is applicable to high temperature hypersalinity reservoir deep profile control.

The invention relates to a high-temperature-resistant gelled fracturing fluid, and a preparation method and application thereof. The fracturing fluid is mainly prepared from the following components in percentage by mass: 0.4-0.8% of anionic polymer, 0.05-0.20% of crosslinking agent, 0.02-0.16% of pH regulator, 0.01-0.10% of delayed crosslinker, 0.1-0.8% of cleanup additive, 0.01-0.09% of viscosity breaker and the balance of water. The anionic polymer is a terpolymer and is copolymerized from the following components in percentage by weight: 60-70% of acrylamide monomer, 15-25% of anionic monomer, 5-15% of cationic monome, totaling 100%. The fracturing fluid can resist the high temperature of 210 DEG C above, has the advantages of crosslinkability, capability of carrying sand, shear resistance, salt resistance, no residue and the like, and is used for fracturing yield increase of hypotonic high-temperature ultra-deep wells.

The invention discloses a high temperature-resistance salt-resistance oil well cement filtrate reducer. The raw materials used in the production of the reducer comprise AMPS(2-acrylamido-2-methyl propane sulfonic acid), acrylic acid, acrylamide, sodium hydroxide, potassium persulfate and water in a mass part ratio of 32-36:2.5-3:12-15:4-6:0.3-0.5:120. The high temperature-resistance oil well cement filtrate reducer prepared according to the formula is applicable to all-grade cement in accordance with API standards; the additive amount of the reducer in a slurry system at a high temperature of 210 DEG C is 5 to 8 percent of the total volume of slurry; and the water loss rate in well cementation can be effectively controlled within 50ml.

The invention relates to the field of manufacture of epoxy acrylate composite resin materials, in particular to a waterborne epoxy acrylate-grafted composite emulsion and a preparation method thereof. The process mainly comprises the following steps of: firstly, by taking a polymerizing monomer as a dispersing medium, enabling epoxide resin and acrylic acid to react under the action of tetrabutylammonium bromide to generate an epoxy acrylate monomer; and secondly, pre-emulsifying the epoxy acrylate monomer and other monomers and then enabling the epoxy acrylate monomer and other monomers to generate a copolymerization reaction to prepare the waterborne epoxy acrylate-grafted composite emulsion by adopting a semi-continuous seeded emulsion polymerization method. According to the process, the copolymerization monomer is used as a solvent dispersing medium for the esterification reaction of the epoxide resin and the acrylic acid in the first step and is also a monomer of the copolymerization reaction in the second step; an organic solvent in the reaction of the first step is prevented from being removed by adopting reduced pressure distillation, so that the influence of residual solvent on the performance of the product is avoided; the waterborne epoxy acrylate-grafted composite emulsion has high grafting rate and can be used for improving the compatibility of the epoxide resin and acrylic acid resin and enhancing the performances of the water resistance, the adhesive force, the salt resistance and the like of a coating and can be widely applied to the fields of metal coatings, building coating materials and the like.

The invention relates to a water-quality purifying Bacillus substilis, CCTCC, M202045, and Bacillus substilis preparation. It uses Bacillus substilis to cultivate and ferment in proper C-N ratio in the solid culture medium, and then dries to produce the preparation. The efficiency of the Bacillus substilis to eliminate water body COD is high. The Bacillus substilis can quickly degrade organics, and has a certain denitrifying and residue degrading ability, and stronger sulfide degrading ability. The test result shows that: COD eliminated can reach 76% in 24 hours, and the Bacillus substilis has excellent characters of salt resistance, osmotic pressure resistance, and maintaining the pH value of the breeding water body.

The invention provides a method for treating or recycling waste water with a high salt content and applications. The method adopts combination processes of pretreatment, a high-efficiency aeration biological filter and depth treatment; and the detail process is shown in the description. The method of invention has the advantages of rapid degradation speed of the high-efficiency aeration biological filter to the pollutants in waste water, high treatment efficiency, good salt resistance, strong anti-impact capacity, stable operation and less sludge generation amount, and being beneficial for enrichment of halotolerant bacteria; the high-efficiency aeration biological filter is taken as a pretreatment process of the membrane treatment, which can effectively prevent membrane surface from scaling, prevent the membrane from being polluted and plugged by colloidal substances, suspended solid grains, organic matters and microorganisms, prolongs reverse purging period, increases the service life of the membrane, keeps stable water generation amount of a membrane system, thus lowering the operation cost. The invention is not only suitable for standard discharge or recycling of concentrated solution before the membrane separation in a membrane separation process, bus also suitable for treatment and recycling of waste water with a high salt content, such as oil extraction waste water and the like, and transformation and upgrading of the existing engineering.

The invention relates to a high-temperature resistance base fluid for well cementing of an oil gas well, which belongs to the filed of oil drilling. The base fluid comprises the following ingredients in parts by weight: 100 parts of water, 6 to 20 parts of high molecular tackifiers, 1 to 8 parts of surface active agents, 1 to 8 parts of shale stabilizing agents and 2 to 15 parts of high-temperature stabilizing agents, wherein the high molecular tackifiers are selected from at least one material of biogum and high molecular fiber polymers, the surface active agents are negative ion surface active agents, the shale stabilizing agents are alkaline earth metal salt, and the high-temperature stabilizing agents are clay minerals. A preparation method comprises the following steps: heating the water; adding each ingredient at the same time of agitation; and then carrying out heat preservation and agitation to obtain the base fluid with the pH value between 6 and 9 and the viscosity between 40 and 180 mPa.s. A flushing fluid can be obtained through diluting the base fluid by water according to a weight ratio of 1/ (5 to 10), and an isolation fluid can be obtained through adding weighting agents into the flushing fluid. The isolation fluid obtained by the method has the advantages of high temperature resistance, good salt resistance performance and freely adjustable density, and has wide application ranges and application prospects.

The invention discloses composite lithium-based lubricating grease and a preparation method thereof. The composite lithium-based lubricating grease comprises the following components based on the weight of the lubricating grease: 65-95% of lubricating base oil, 6-20% of a composite lithium-based thickener and 0.5-15% of graphene. The composite lithium-based lubricating grease has the advantages of excellent high-temperature resistance, water resistance and adhesion, colloid stability, extreme-pressure anti-wear property, lubrication service life, corrosion resistance, salt spray resistance and the like.

The invention provides a preparation method of amphoteric retanning fatliquor. The preparation method comprises the steps of: carrying out amidate modification on oil; adding natural animal or vegetable oil, monoethanolamine and a first catalyst to a reactor which is provided with a mixer and a thermometer for being uniformly mixed, and then heating to react to obtain a system A; carrying out esterification modification, and adding maleic anhydride and a second catalyst in the system A, and uniformly mixing, and then heating to react, and cooling after the completion of the reaction, neutralizing the pH of the system into 7.0 through an alkaline aqueous solution, thus obtaining a system B; carrying out polymerization reaction, heating the system B, and synchronously dropwise adding acrylic acid derivatives, an amino cationic vinyl monomer aqueous solution and an initiator aqueous solution, and then heating to react, thus obtaining a system C; and compensating and metering water, and adjusting the content of effective solid in the system C to obtain the amphoteric retanning fatliquor. The amphoteric retanning fatliquor has high acid resistance, alkali resistance, salt resistance and electrolyte resistance, and is suitable for amphoteric retanning fatliquoring technologies under various conditions.

The invention relates to a viscous oil emulsification and viscosity reduction agent. The emulsification and viscosity reduction agent comprises an anionic surfactant, a nonionic-anionic Gemini surfactant, a C1-C8 alcohol and water, wherein the weight ratio of the anionic surfactant to the nonionic-anionic Gemini surfactant to the C1-C8 alcohol is 1:0.1-40:0.01-10, and the water amount is 0.2-5000 times the total weight of the anionic surfactant, the nonionic-anionic Gemini surfactant and the C1-C8 alcohol. The emulsification and viscosity reduction agent has the advantages of no alkalis, strong mineral salt resistance, realization of emulsifying ultrahigh-viscosity viscose oil having above 30% of asphaltene, low viscosity of the emulsified oil, moderate emulsification cost and the like.

The invention relates to a slow-expansion water-absorbable salt-resistant gel particle, and preparation and applications thereof. The gel particle relates to crosslinked gel having a net structure and formed by reactions of following raw materials: A), an acrylamide monomer, B) acrylic acid, C) a crosslinking agent, D) a salt-resistant crosslinking agent, E) an initiator that is persulfate, F) a reinforcing agent, G) a pH value conditioning agent, H) a foaming agent and I) water. The gel particle is a gel particle modifying and flooding agent having slow expansion performance, strong water absorption performance and salt resistance. The gel particle slowly absorbs water and expands when encountering water, and along with construction, the gel particle blocks, in the deep stratum, cracks or large pores and channels, thus adjusting water absorption profiles, diverting liquid streams, reducing inert areas in oil deposits, increasing production of oil of an oil well, and achieving a function of increasing the oil recovery rate of the oil deposits. The gel particle is low in expansion in construction processes, so that pressure rise is small, and the gel particle is suitable for profile control of a water injection well having low permeability and high water injection pressure.

The invention discloses a preparation method of polyester resin used in outdoor weatherable powder paint. The method comprises the steps that: (1) washed, impurity-removed, and crushed PET raw material is subjected to a trans-esterification reaction with dihydric alcohol with a boiling point higher than that of ethylene glycol under the existence of a trans-esterification catalyst; after the trans-esterification reaction is finished, polyol, polyacid/anhydride, and a stabilizer are added; an esterification reaction is carried out under the effect of an esterification catalyst; isophthalic acid and a curing accelerator triphenylphosphine are added, and a stirring reaction is carried out, such that the polyester resin used in outdoor weatherable powder paint is obtained. The polyester resin has the characteristics of outdoor weatherability, baking resistance, salt spray resistance, and the like of a powder paint synthesized and produced by using weatherable polyester resin, and has good gloss, impact resistance, and excellent leveling performance. The pollutions to the environment caused by polyester waste material and esterification water produced in purified terephthalic acid synthesis are reduced. Therefore, the technical scheme provided by the invention is environment-friendly.

The invention discloses a preparation method of a super wetting titanium dioxide nanorod porous membrane and application of the super wetting titanium dioxide nanorod porous membrane to emulsion separation, and belongs to the technical field of function materials. The method comprises the following steps: preparing a PVP/TiO2 composite fiber membrane through an electrospinning technology, and drying the composite fiber membrane in a drying oven; laying the dried composite fiber membrane in a muffle furnace for calcining the composite fiber membrane for a certain period, removing organic carbon in the composite fiber membrane, calcining the composite fiber membrane to form an inorganic TiO2 fiber membrane, vertically laying the calcined inorganic TiO2 fiber membrane into a hydrothermal polymeric pecursor solution in a polytetrafluoroethylene liner, and performing a hydrothermal reaction, so as to obtain a super-hydrophilicity and underwater super-oleophobicity porous super wetting micro-nano composite structure membrane. The obtained membrane has high environmental stability, namely acid resistance, alkali resistance and salt resistance, and can be applied to sewage treatment in harsh acid and alkali salt environments, so that the efficient separation of a corrosive emulsion is realized, and e the application value is high. The preparation method is simple, and is convenient, efficient and rapid for emulsion separation.

The invention discloses a herbicide resistance gene and an application thereof. The herbicide resistance gene comprises a base sequence in SEQ ID NO:1. The invention also discloses a herbicide resistance protein and a plant expression plasmid, wherein the herbicide resistance protein contains an amino acid sequence in SEQ ID NO:2, and the plant expression plasmid contains the herbicide resistancegene. The herbicide resistance gene is a resistance gene of an HPPD inhibitor type herbicide and is led into plant cells through the gene engineering technology to prepare a transgenic plant which has natural resistance to the HPPD inhibitor type herbicide and simultaneously has high stress resistance such as salt resistance and the like.

The invention discloses a comb-shaped modified polysiloxane anion water-based thick oil viscosity reducer and a synthesizing method thereof. In the viscosity reducer, a comb-shaped structure in which polydimethylsiloxane is taken as a main chain, long chain alkyl and a propylidene polypropylene oxide polyoxyethylene ether organic acid ester salt are taken as side chains is adopted, the side chains are connected through a Si-C chemical bond, and the viscosity reducer has high surface activity, high interface activity, high temperature resistance, high salt resistance, high hydrolysis property and large viscosity reducing capability on thick oil. The molecular structural general formula of the comb-shaped modified polysiloxane anion water-based thick oil viscosity reducer is shown as (I), wherein polydimethylsiloxane is taken as the main chain of a molecular structure; the long chain alkyl and the propylidene polypropylene oxide polyoxyethylene ether organic acid ester salt are taken as side chains; and the main chain is connected with the side chains through the Si-C chemical bond.