6515 results about "Structural unit" patented technology

To provide a resist composition which enhances both effects of roughness reduction and film loss suppression in resist pattern formation.SOLUTION: The resist composition contains a resin component having a constituent unit derived from a compound represented by formula (a0-m0). W0 represents a polymerizable group-containing group; Rar1 represents an optionally substituted aromatic group; L01 represents a divalent linking group or a single bond; Vb0 represents an alkylene group, a fluorinated alkylene group or a single bond; R0 represents a fluorinated alkyl group, a fluorine atom or a hydrogen atom; L02 represents a (p+1)-valent linking group or a single bond; p represents an integer of 1 or more, provided that p is 1 when L02 represents a single bond; Rar2 represents an optionally substituted aromatic group; and q represents an integer of 1 or more.SELECTED DRAWING: None

The present invention uses a resist composition that contains a base material component that has a structural unit derived from a compound represented by general formula (a0-1). In formula (a0-1), W01 represents a polymerizable group–containing group, La01 represents a divalent linking group or a single bond, and I represents an iodine atom. Ra02 represents a substituent other than an iodine atom. Ya01 represents a divalent linking group or a single bond. Va01 represents a single bond, an alkylene group, or a fluorinated alkylene group. Ra01 represents a hydrogen atom, a fluorine atom, or a fluorinated alkyl group. Mm+ is an m-valent cation.

The invention relates to a high-single-mode ultra-low-loss hollow-core anti-resonance optical fiber which comprises an outer cladding and an inner cladding, the inner cladding is composed of nested structure units, the nested structure units are arranged in the circumferential direction of the inner wall of the outer cladding and are connected with the inner wall of the outer cladding, a fiber core is formed by a central cavity wrapped by the inner cladding, and the fiber core is connected with the inner cladding through the nested structure units. The embedded glass tube is characterized in that each embedded structure unit comprises three or more layers of embedded glass tubes with different radiuses, at least one embedded glass tube with at least one layer of embedded glass tubes deflects towards one side relative to the adjacent outer embedded glass tube, and the deflection included angle is 5-55 degrees. According to the invention, through the change of the cladding structure, the reasonable nested structure unit shape capable of being prepared, the optimized nested size combination and the deflection of the embedded glass tube, the leakage loss of the LP11 mode is obviously improved, the influence on the fundamental mode performance is small, and finally the single-mode performance of the optical fiber is effectively improved.

The invention relates to a high-single-mode low-loss hollow-core anti-resonance optical fiber which comprises an outer cladding and an inner cladding, the inner cladding is composed of nested structure units, the nested structure units are arranged in the circumferential direction of the inner wall of the outer cladding and are connected with the inner wall of the outer cladding, a fiber core is formed by a central cavity wrapped by the inner cladding, and the fiber core is connected with the inner cladding through the nested structure units. The nesting structure is characterized in that each nesting structure unit comprises two layers of nesting glass tubes with different radiuses, the nesting glass tubes comprise outer nesting glass tubes and inner nesting glass tubes, at least one inner nesting glass tube deflects towards one side relative to the outer nesting glass tube where the inner nesting glass tube is located, and the deflection included angle ranges from 5 degrees to 55 degrees. According to the invention, through the change of the cladding structure, the reasonable nested structure unit shape capable of being prepared, the optimized nested size combination and the deflection of the embedded glass tube, the leakage loss of the LP11 mode is obviously improved, the influence on the fundamental mode performance is small, and finally the single-mode performance of the optical fiber is effectively improved.

The invention belongs to the technical field of anion exchange membranes, and relates to a cross-linked polyaromatic piperidine anion exchange membrane and a preparation method thereof. The exchange membrane structure comprises a copolymer structure of the following repetitive structural units, the selected rigid main chain polyaromatic hydrocarbon can ensure the mechanical strength of the anion exchange membrane, meanwhile, the toughness of the anion exchange membrane is further enhanced by adopting a cross-linked structure, and a formed cross-linked network can reduce swelling of the anion exchange membrane, so that the anion exchange membrane is more stable in performance. The mechanical performance is improved; according to the invention, ether-free skeleton polyaromatic hydrocarbon is selected as a main chain and has the characteristic of strong alkali-resistant stability, six-membered nitrogen heterocyclic ions are adopted as functional groups, and a large steric hindrance structure can hinder nucleophilic substitution and elimination reaction, so that the alkali-resistant stability of the anion exchange membrane is improved, and the service life of the anion exchange membrane is prolonged. And in the # imgabs0 #, X is equal to 0.05 to 0.15.

The invention relates to a flame-retardant inorganic quick-setting material and a preparation method thereof, and the flame-retardant inorganic quick-setting material is prepared from the following raw materials: sulphoaluminate cement, aluminum-magnesium hydrotalcite, phosphorus slag powder, waste PBO fiber, an accelerator, a water reducer, a functional auxiliary agent, and 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone. The functional auxiliary agent comprises structural units introduced by the following monomers: 3-[N, N-dimethyl-[2-(2-methylpropyl-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt, diphenyl (4-vinyl phenyl) phosphine oxide, 1, 3-bis (oxirane methyl)-5-(2-allyl)-1, 3, 5-triazine-2, 4, 6 (1H, 3H, 5H)-triketone, 10-(4-vinyl phenyl)-10H-phenoxazine and itaconic acid. The material is high in strength, remarkable in rapid hardening and flame-retardant effect, and safe and environment-friendly to use.

The invention discloses a waterproof anticorrosive coating and a preparation method and application thereof, and relates to the technical field of coatings, and the waterproof anticorrosive coating is prepared from the following raw materials in parts by weight: 30-40 parts of carboxyl-terminated hyperbranched polyester resin, 20-30 parts of carboxyl-terminated functional polyamide, 10-15 parts of hyperbranched polyurethane containing epoxy groups, 15-20 parts of filler, 1-3 parts of (3, 6-diamino acridine-9-yl) boric acid, 1-3 parts of 1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5- the component A is prepared from the following components in parts by weight: 3-5 parts of 2, 3, 5-triglycidyl-S-triazinetrione, 1-2 parts of a coupling agent, 0.8-1.2 parts of a flatting agent and 0.6-1.3 parts of a defoaming agent; the carboxyl-terminated functional polyamide comprises a structural unit introduced by the following monomers: N-(4H-1, 2, 4-triazole-4-yl) diphenylamine-4, 4 '-dicarboxylic acid, and 3, 3'-diamino-4, 4 '-difluorodiphenyl sulfone. The coating is good in waterproof and anti-corrosion performance, high in adhesive force with a base material, sufficient in solvent resistance and aging resistance and long in service life.

The invention discloses a reinforced soil structure design method based on finite difference analysis and considering anisotropy of a rib material, which comprises the following steps: establishing a roadbed reinforced soil corner slope three-dimensional model, simulating a roadbed layer by adopting a Duncan-Zhang nonlinear constitutive equation, simulating a foundation layer by adopting an elastic constitutive equation, and simulating a geogrid by adopting a Cable structure unit. A Geogrid structural unit is adopted to simulate the geotechnical cloth; on the basis of a verified model, different mechanical parameters are given to transverse and longitudinal ribs of the bidirectional geogrid to realize self-mechanical behavior anisotropy, the arrangement angle of a Cable unit and the center line of a reinforced soil structure is changed to realize the mechanical behavior anisotropy of a rib-soil interface, and meanwhile, other single or multiple variables can be adjusted, so that the mechanical behavior anisotropy of the rib-soil interface is realized. And testing the influence rule of the key factors on the mechanical properties of the reinforced soil structure. According to the method, the problem that the stress directions of the reinforced soil structure bars are inconsistent or uncertain under the complex geological condition can be solved, and more practical reinforced soil structure design parameters are effectively provided.

Provided is a dispersant for hydraulic compositions that has high dispersibility and can reduce the viscosity of the hydraulic composition. [Solution] A dispersant for hydraulic compositions comprising: a polymer (P) having a structural unit (1) formed from a compound represented by general formula (1), and a structural unit (2) formed from a compound containing at least one selected from acrylic acid, methacrylic acid, fumaric acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, and salts thereof; and an ether compound (A) which is a compound in which 1 to 500 moles of an alkylene oxide having 2 to 4 carbon atoms are added to 1 mole of a mono- to tetrahydric aliphatic alcohol having 2 to 24 carbon atoms, wherein the mass average molecular weight of the polymer (P) is 5,000 to 5,000,000, and the mass ratio (A / P) of the ether compound (A) to the polymer (P) is greater than 0 and less than or equal to 0.25.

The present invention provides a slurry composition comprising (a) an electrochemically active material and / or an electrically conductive agent; and (b) a binder comprising (i) a polymer comprising a fluoropolymer dispersed in a liquid medium; and (ii) a polymer comprising an addition polymer comprising constitutional units comprising the residue of a heterocyclic group-containing ethylenically unsaturated monomer. The present invention also provides electrodes and electrical storage devices.

The invention provides a binder, a negative pole piece and a battery, the binder comprises a polyimide binding material, the polyimide binding material comprises a first structural unit from an amino sulfonic acid monomer, a second structural unit from an amino monomer, and a third structural unit from an anhydride monomer; the mass percentage content of sulfonate radicals in the polyimide binding material is 15-35 wt%. The binder provided by the invention has a good binding effect, and is beneficial to improving the stability of the battery.

To provide a resist composition which achieves higher sensitivity in forming a resist pattern and can form a resist pattern having reduced LWR and improved etching resistance, a resist pattern forming method using the resist composition, a polymer compound useful for the resist composition, and a compound usable for synthesizing the polymer compound.SOLUTION: The resist composition contains a resin component (A1) containing a constituent unit (a0) represented by general formula (a0) (where R represents a hydrogen atom or the like; X0 represents a hydrogen atom or an alkyl group; and Ar01 represents an optionally substituted arylene group).SELECTED DRAWING: None

The present invention relates to a multi-aziridine compound having:a) from 2 to 6 of the following structural units (A):wherebyR′, R″, R1, R2, R3 and R4 are as defined hereinm is an integer from 1 to 6;b) one or more linking chains wherein each one of these linking chains links two of the structural units A; andc) a molecular weight in the range from 600 Daltons to 5000 Daltons.The multi-aziridine compound can be used for example for crosslinking of for example carboxylic acid functional polymers dissolved and / or dispersed in an aqueous medium.

The invention relates to the technical field of adhesives, in particular to a high-temperature-resistant adhesive, a preparation method thereof and a high-temperature-resistant protective film. The invention provides a high-temperature-resistant adhesive. The high-temperature-resistant adhesive comprises acrylic resin, a cross-linking agent and a solvent, the dosage of the cross-linking agent is 1wt%-2wt% of the acrylic resin; the acrylic resin contains a structural unit as shown in the following formula I: # imgabs0 #; r is selected from alkylene with the carbon number of 1-3. The high-temperature-resistant monomer is introduced into a main body of the acrylic resin, and a boric acid group in the structure of the high-temperature-resistant monomer can be dehydrated under a high-temperature condition to form a boric acid ester structure and generate a cross-linking point, so that the cohesive strength is further improved, the adhesive is endowed with excellent high-temperature resistance, and the stripping force climbing of the adhesive at a high temperature is low.

The invention relates to the technical field of polyurethane foam, and discloses fireproof flame-retardant foaming polyurethane and a preparation method thereof.The foaming polyurethane comprises a component A and a component B. The component A comprises, by weight, 100 parts of polyether polyol, 25-50 parts of a flame-retardant chain extender and the like; and the component B is 62-86 parts by weight of an isocyanate compound. The flame-retardant chain extender contains a plurality of polymerization sites, so that the crosslinking density of a polyurethane molecular chain is improved, a stable crosslinking network is formed, and meanwhile, the flame-retardant chain extender contains a siloxane structural unit with structural stability, so that the foamed polyurethane has higher compression strength. The flame-retardant chain extender contains a phosphate flame-retardant group, and forms a phosphorus-silicon flame-retardant system with a siloxane structure, so that the combustion heat release rate peak value, the total heat release amount and the total smoke release amount of foam are reduced, and the flame-retardant chain extender has good fireproof and flame-retardant properties.

The invention provides a positive photoresist composition as well as a preparation method and application thereof. The positive photoresist composition comprises acrylic copolymer resin and a photosensitizer, the acrylic copolymer resin comprises a first structural unit, a second structural unit and a third structural unit. The positive photoresist composition has the advantages of favorable aging resistance, high refractive index, high transmittance, high adhesive force and high hardness.

The invention discloses an environment-friendly flame-retardant polyester yarn and a preparation method thereof, and relates to the technical field of textile, and the environment-friendly flame-retardant polyester yarn is prepared from the following raw materials in parts by weight: 100 parts of polyester chips, 10-15 parts of a flame-retardant polymer containing an organic salt structure, 1-3 parts of an antioxidant, 0.8-2 parts of a lubricant, 1-2 parts of benzotriazole sodium and 0.8-1.2 parts of quinoline yellow. The flame-retardant polymer containing the organic salt structure comprises a structural unit introduced by the following monomers: bis (3-aminophenyl) (3, 5-bis (trifluoromethyl) phenyl) phosphine oxide, 3, 7-diamino-5-phenylphenazine chloride and 3, 5-isoxazole dicarboxylic acid. The environment-friendly flame-retardant polyester yarn is good in ultraviolet aging resistance and flame retardance, high in strength and sufficient in softness.

A bioscaffold structure is provided, the bioscaffold comprising a plurality of connected unit cells, each unit cell comprising a plurality of filaments composed of an extracellular material containing Collagen I and Collagen III, wherein each of the plurality of unit cells includes at least one opening connected to an internal volume.

The invention relates to the technical field of PET geothermal films, and discloses a high-temperature-resistant geothermal film and a preparation method thereof.The high-temperature-resistant geothermal film is obtained through blending extrusion and blow molding of polyethylene glycol terephthalate, carboxyl polyetherimide and modified graphene. The carboxyl polyetherimide contains a benzoate structural unit similar to PET, the carboxyl polyetherimide and the benzoate structural unit form an alloy-like system with good compatibility, the modified graphene is good in dispersity and excellent in compatibility with PET, meanwhile, the modified graphene contains more carboxyl groups, and the carboxyl groups and carboxyl groups of side chains of the carboxyl polyetherimide interact with each other to form hydrogen bonds and the like; the graphene can be uniformly dispersed in a composite system of PET and carboxyl polyetherimide, so that a better reinforcing effect is achieved, and the tensile strength and the elongation at break of the PET composite geothermal film are remarkably improved. After high-temperature thermal aging, the geothermal film is high in retention rate of tensile strength and elongation at break and good in high-temperature resistance.

The invention discloses a boiler water energy-saving and emission-reducing agent, and relates to the technical field of boiler energy conservation, and the boiler water energy-saving and emission-reducing agent is prepared from the following components: 1, 3-bis ((trihydroxymethyl) methylamino) propane, sodium lignin sulfonate, caffeine, (3, 6-diamino-9-acridinyl) boric acid, a functional copolymer, sodium glycyrrhizinate, hydroxypropyl beta-cyclodextrin and deionized water. The functional copolymer comprises a structural unit introduced by the following monomers: N-acryloyl morpholine, 3-[N, N-dimethyl-[2-(2-methylpropyl-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt, N-trihydroxymethyl methacrylamide, and 2-[3-(2H-benzotriazole-2-yl)-4-hydroxyphenyl] ethyl 2-methacrylate. The agent has remarkable scale and corrosion inhibition effects, is safe and environment-friendly to use, and has good energy-saving and emission-reducing effects.

The invention relates to a conjugated microporous polymer based on a dicarbazole structure and a preparation method and application thereof, the conjugated microporous polymer has a dicarbazole structure unit and a nitrogen-containing aromatic structure unit, the dicarbazole monomer structure is represented by the formula (I): # imgabs0 #, in the structure represented by the formula (I): R = H, R1 = C = H or R1 = H, R = C = H; the structure of the nitrogen-containing aromatic monomer is shown as a formula (II): # imgabs 1 #, wherein the aromatic structure in the structure shown as the formula (II) is any one of benzene, pyridine, pyrimidine, pyrazine and pyridazine. A plurality of conjugated microporous polymers with excellent photocatalytic performance are obtained by changing aromatic monomers with different nitrogen contents, and the conjugated microporous polymers can be applied to high-efficiency production of hydrogen peroxide under photocatalytic conditions.

The invention discloses a preparation method and application of a cell culture liver based on a microcarrier. The method comprises the steps of obtaining liver seed cells, preparing the microcarrier, culturing cells in vitro based on the microcarrier, preparing the cell culture liver and the like. The preparation method of the cell culture liver based on the microcarrier is provided for the first time, and the preparation scheme that a cell-microcarrier compound serves as a structural unit and is assembled into the cell culture liver after being mixed with an edible material is adopted, so that on one hand, simulation of a real liver lobule structure can be achieved, and on the other hand, simulation of the liver lobule structure can be achieved; the whole structure relation of liver lobules and connective tissues in liver tissues can be simulated, full reduction of animal liver appearance and structural characteristics is achieved, edible materials used in the preparation process are low in price and good in biocompatibility, and the preparation method is suitable for large-scale industrial production. Liver seed cells can be subjected to efficient amplification and albumin synthesis through three-dimensional culture on a microcarrier prepared on the basis of edible materials, so that the cell culture liver is close to a real animal liver in the aspect of nutrition.

The invention discloses a nano composition with a deep acne removal effect and a preparation method and application thereof.The preparation method includes the steps that a straight-chain alkane structural unit (containing six or more carbon atoms) is adopted as an initiator to initiate a hydrophilic polymeric monomer to be subjected to a polymerization reaction, an amphiphilic polymer is prepared, acne removal active ingredients are entrapped, and the nano composition with the deep acne removal effect is obtained; the obtained nano composition has high encapsulation efficiency, and the encapsulation efficiency can reach 53.8% or above, and even can reach 80% or above. Meanwhile, the acne-removing nano composition has good percutaneous permeability and antibacterial effect and can be used for preparing acne-removing products, and the acne-removing effect of the acne-removing nano composition is remarkably superior to that of other acne-removing products.

The invention provides a floating type annular wave-resistant offshore photovoltaic structure. The floating type annular wave-resistant offshore photovoltaic structure comprises arc-shaped wave-resistant structure units, spring connectors, photovoltaic buoyancy tanks, photovoltaic modules, buoyancy tank mooring cables, mooring cables and pile anchors. The plurality of arc-shaped anti-wave structure units are flexibly and annularly connected through the spring connectors to form a floating type annular anti-wave structure; photovoltaic buoyancy tanks are fully paved in the circular ring of the floating type annular wave-resistant structure in parallel, and a photovoltaic module is fixedly mounted on the surface of each photovoltaic buoyancy tank. The structure main body of the novel floating type annular wave-resistant offshore photovoltaic structure adopts arc-shaped wave-resistant structures made of a high-density polyethylene material, the arc-shaped wave-resistant structures are connected into an integral circular ring through spring connectors, photovoltaic modules in the ring are protected and moored, a plurality of macromolecule buoyancy tank mooring cables are adopted in the ring to be connected with photovoltaic buoyancy tanks, and the photovoltaic buoyancy tanks are connected into a whole. The whole structure has certain flexibility and has the advantages of being small in steel consumption, high in weather resistance, low in building cost, high in wind wave resistance, easy and convenient to construct, good in power generation economical efficiency and the like.

The present invention relates to the field of oilfield chemical drilling fluid treatment agents, and disclosed are a chitosan graft copolymer, a preparation method therefor, and a drilling fluid. The chitosan graft copolymer has a structure as shown in formula (I), the number average molecular weight is 200,000-600,000, m is 1,200-3,500, and X and Z are each independently H, -R1COOM1 or a polymer segment; R1 is an alkylene group of C1-C5, and M1 is H, Na or K; the polymer segment comprises a structural unit A and a structural unit B, the structural unit A comprising at least two -COOM2, M2 being H, Na or K, the structural unit B comprising a cyclic lactam structure, and Y being H or a quaternary ammonium salt structure having an ester group. The chitosan graft copolymer provided by the present invention has good wall-fixing performance and filtration loss reduction performance, thereby ensuring well wall stability in easily collapsed formations in shale fracture zones by means of both wall-fixing and reducing filtrate infiltration.

The purposes of the present invention is: to provide an adhesive composition which has excellent adhesive force and holding properties in addition to excellent low dielectric properties; to provide an adhesive tape which has an adhesive layer that contains the adhesive composition; to provide a resin molded body which is molded from a resin composition that comprises the adhesive composition; to provide a composite structure which comprises the adhesive tape; to provide an automobile member which comprises the resin molded body or the composite structure; and to provide a method for producing a resin molded body using the composite structure.　The present invention provides an adhesive composition which contains: an acrylic copolymer that has a constituent unit derived from a (meth)acrylic acid alkyl ester, a constituent unit derived from an olefin-based polymer that has a polymerizable unsaturated double bond at an end thereof, and a constituent unit derived from a polar functional group-containing monomer; and a styrene-based elastomer that contains at least one substance selected from the group consisting of a block copolymer which has a block derived from a styrene-based monomer and a block derived from a conjugated diene-based monomer, and a hydrogenated product of the block copolymer.

Provided is a polyamide resin, which is a copolymer of a biodegradable polyamide, such as polyamide 2 to polyamide 4, and another polyamide, the polyamide resin having enhanced biodegradability. The polyamide resin contains a structural unit represented by Formula (1) and another polyamide structural unit, and a difference between a degree of randomness determined based on a proportion of each structural unit as determined by 1H-NMR measurement when structural units are assumed to have an ideal random sequence and a degree of randomness determined based on a proportion of carbonyl carbon of an amide group linking different structural units with respect to a total peak integrated value for carbonyl carbon as determined by 13C-NMR measurement is 0.10 or less, where in Formula (1), x is an integer of 1 or greater and 3 or less.

The invention relates to the field of oilfield chemical drilling fluid treatment agents, and discloses a chitosan grafted copolymer, a preparation method thereof and a drilling fluid, the chitosan grafted copolymer has a structure as shown in formula (I), and the number-average molecular weight is 200000-600000; m is 1200 to 3500, and X and Z are respectively and independently H or-R1COOM1 or a polymeric chain segment; wherein R1 is alkylene of C1-C5, and M1 is H, Na or K; the polymeric chain segment contains a structural unit A and a structural unit B, the structural unit A contains at least two-COOM2, M2 is H, Na or K, and the structural unit B contains a cyclic lactam structure; y is H or a quaternary ammonium salt structure with an ester group. The chitosan grafted copolymer provided by the invention has relatively good wall fixing performance and filtrate loss reduction performance, and ensures well wall stability of easy-to-collapse stratum of shale fracture zone from two aspects of wall fixing and filtrate invasion reduction, # imgabs0 #

The invention discloses a PHA-acrylic acid structural unit water-based dispersion based on interface engineering regulation and control, a preparation method thereof and application of a paper-based barrier coating, and belongs to the technical field of high polymer materials, interface engineering and water-based coatings. The stable interface layer is constructed in situ between the crystalline PHA and the acrylic resin through the amphiphilic polymer, so that the problems of poor compatibility and film forming defects of a bio-based material are effectively solved. The dispersion can realize excellent waterproof, oil-proof and gas barrier effects by only needing a relatively low coating weight, and the material consumption is remarkably reduced. The unique gradient structure of the coating has excellent mechanical adhesive force and efficient re-pulping and recycling characteristics, and the technical defect that a traditional barrier coating is difficult to recycle is overcome. And an ideal solution with high performance and high safety is provided for green packaging.

The invention relates to the technical field of drilling, and discloses a strong-adsorption hyperbranched filtrate reducer for 240 DEG C saturated salt water-based drilling fluid as well as a preparation method and application of the strong-adsorption hyperbranched filtrate reducer. The filtrate reducer comprises a first structural unit, a second structural unit, a third structural unit, a fourth structural unit, a fifth structural unit and a sixth structural unit, the first structural unit is provided by an anionic hydration enhancing monomer, the second structural unit is provided by a cationic positive electricity adsorption monomer, the third structural unit is provided by a cationic positive electricity adsorption monomer, and the sixth structural unit is provided by a cationic positive electricity adsorption monomer. The third structural unit is provided by a main chain monomer, the fourth structural unit is provided by a cyclic monomer, the fifth structural unit is provided by a polyether monomer, and the sixth structural unit is provided by a hyperbranched structural monomer. The filtrate reducer disclosed by the invention can keep good rheology and filtrate reduction performance of drilling fluid under the conditions of 240 DEG C and saturated salt, and is stable for a long time.