2828 results about "Structural unit" patented technology

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 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 ink, and discloses a preparation method of bio-based degradable water-based ink, which comprises the following steps: carrying out esterification polymerization on vanillin-based spiro acetal diglycidyl ether and diacid to obtain bio-based polyester resin, mixing and dispersing the bio-based polyester resin, petroleum-based resin, pigment, auxiliary agent and the like to obtain the bio-based degradable water-based ink. The bio-based degradable water-based ink is prepared. The bio-based resin contains a plurality of hydrophilic hydroxyl groups, has good solubility and dispersibility in the water-based ink, and generates denser hydrogen bonds and other cross-linking effects with the acrylic resin, so that the hardness of the ink is improved. Meanwhile, the polar hydroxyl groups also greatly enhance the hydrogen bond bonding and anchoring effect between the paint film and the base material, so that the adhesive force is improved. In addition, easily-hydrolyzed spiral acetal bonds, polyester structural units and other degradable chemical bonds in molecular chains of the bio-based resin provide more attack sites for water and microorganisms, the degradation rate is increased, and the degradable function is achieved.

The invention provides copolymerized flame-retardant nylon containing nitrogen and phosphorus as well as a preparation method and application of the copolymerized flame-retardant nylon. The copolymerized flame-retardant nylon containing nitrogen and phosphorus is formed by copolymerizing a structural unit I and lactam or copolymerizing the structural unit I, diamine and binary acid, the nitrogen and phosphorus-containing copolymerized flame-retardant nylon belongs to a halogen-free flame-retardant environment-friendly high polymer material and is intrinsic flame-retardant nylon, so that the problems of flame retardant migration, compatibility with a base material and the like do not exist, excellent flame-retardant performance can be achieved under the condition of relatively low introduction amount of a flame-retardant structural unit, and meanwhile, excellent mechanical property and spinnability can be kept.

The invention provides a composite photo-thermal hydrogel for seawater desalination and a preparation method and application thereof, the hydrogel has a structural unit of a structure as shown in a formula I. COF with photo-thermal performance is compounded with the hydrogel, and the hydrogel has a three-dimensional long-range ordered pore structure to promote transmission of water molecules; and the COF dispersed in the material contains porphyrin and a C = N double-bond connection structure, so that the material has excellent photothermal conversion efficiency. Therefore, under the irradiation of sunlight, the composite photo-thermal hydrogel disclosed by the invention can realize photo-thermal conversion to realize seawater evaporation, the seawater evaporation rate reaches 3.6 kgm <-1 > h <-1 >, and the performance is improved by about 3 times compared with that of a traditional carbon-based material. According to the preparation method of the composite photo-thermal hydrogel, large and complex equipment is not involved in the preparation method, the preparation technological process is simple, and industrial large-scale production is facilitated; and the reaction temperature in the preparation process is low, the energy consumption is also reduced, and the cost advantage is remarkable.

This anticorrosive coating composition comprises a main agent (I) and a curing agent (II), wherein: the main agent (I) contains an epoxy resin (a); the epoxy resin (a) contains at least one of a bisphenol A epoxy resin (a-11) and a novolac epoxy resin (a-12) each having a weight average molecular weight of 6,000-12,000; the curing agent (II) contains a polyamine (b) and an alkylphenol (c); the polyamine (b) contains an alicyclic polyamine (b-1) having a cyclic aliphatic hydrocarbon group to which an amino group is bonded and contains a non-alicyclic polyamine (b-2) having no cyclic aliphatic hydrocarbon group to which an amino group is bonded; at least one of the main agent (I) and the curing agent (II) includes a vinyl-based defoaming agent (d) that has a constituent unit derived from at least one monomer selected from the group consisting of alkyl (meth)acrylates, alkyl vinyl ethers, and olefins and that has a number average molecular weight of 30,000-100,000 or 300,000-2,000,000; the content of the alicyclic polyamine (b-1) is 30%-80% by mass of the solid content of the curing agent (II); the content of the non-alicyclic polyamine (b-2) is 2%-45% by mass of the solid content of the curing agent (II); the content of the alkylphenol (c) is 5%-60% by mass of the solid content of the curing agent (II); and the content of the vinyl-based defoaming agent (d) is 0.005-3 parts by mass with respect to 100 parts by mass of the anticorrosive coating composition.

The invention relates to the technical field of adsorption materials, and discloses a post-modified imine-COF adsorbent and a preparation method and application thereof, the adsorbent comprises the following structural units: a COF skeleton, which is a two-dimensional or three-dimensional porous skeleton formed by an aromatic aldehyde monomer and an amino monomer through a Schiff base reaction; the imine group is formed in a COF skeleton through a post-modification reaction, and the imine group is-C = NR, r is selected from one or more of a substituted or unsubstituted alkyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted cycloalkenyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted heterocyclic group and a hydrogen atom. The adsorbent retains excellent structural characteristics of the COF material, realizes high density and uniform distribution of functional groups, and avoids interference of functional monomers on crystal nucleation and growth, so that the adsorption performance of the adsorbent is improved, and the adsorbent can efficiently capture rare earth when being applied to a rare earth-containing solution.

The invention relates to a multilayer packaging material with high barrier property and application thereof. The multi-layer packaging material at least comprises three layers, namely a layer A, a layer B and a layer C, wherein the layer B is located between the layer A and the layer C; the layer A is prepared from the following raw materials: first biodegradable polyurethane and a cellulose nanocrystal graft which is obtained by performing grafting treatment on cellulose nanocrystal after hydrophobic modification, and the content of the cellulose nanocrystal graft is 1wt%-10wt% of that of the first biodegradable polyurethane; the raw material of the layer B comprises biodegradable polyester containing a glycollic acid structural unit, and the content of the glycollic acid structural unit is not less than 60% mol; the raw material of the layer C comprises second biodegradable polyurethane. The hydrophobic modified cellulose nanocrystals are uniformly dispersed in the layer A, so that the adsorption of water vapor on the layer A is reduced, the permeation of the water vapor is hindered, and the barrier property of the whole material is improved.

The invention relates to an acylhydrazone bond-connected covalent organic framework material, in particular to an acylhydrazone bond-connected covalent organic framework material as well as a preparation method and application thereof, and aims to overcome the defects of various materials for adsorbing Pd (II) in one aspect or the defects of poor stability and durability in high-acidity and high-radioactivity environments. Or the adsorption selectivity on Pd (II) is not strong. As an emerging crystalline organic porous polymer, the covalent organic framework is mainly formed by connecting pure organic structural units through dynamic covalent bonds, has the advantages of permanent high porosity, low density, high chemical stability, high thermal stability and the like, and is expected to realize Pd (II) adsorption in strong acid and ray irradiation environments.

The invention provides polyester and a preparation method and application thereof, the polyester comprises a structural unit derived from the following monomer components: at least one monomer component I selected from hydroxybenzoic acid or hydroxynaphthoic acid; and at least one monomer component II, wherein the monomer component II is selected from p-hydroxybenzoic acid containing a substituent group. A small amount of the monomer component II is introduced into the polyester material, interaction points are provided for chain segments of the polymer, the chain segments are promoted to form a branched structure, and therefore the melt strength of the polymer is well improved.

The invention discloses a hypha mineral composite bionic sand stabilization unit body and a preparation method thereof, and relates to the technical field of sand stabilization, the interior of the unit body is provided with a bionic three-dimensional porous skeleton structure, the unit body comprises a porous core layer, a porous core layer and a porous core layer, the porous core layer takes cleaning sand grains with the particle size of 0.1-2 mm as a sand-based carrier; uniformly mixing and curing with organic nutrient substances, mineral precursors and strain spores; the composite reinforcing layer is formed by interweaving and compounding a mycelium network formed by germination and growth of strain spores, mineral crystals generated by in-situ mineralization induced by metabolic activity of hyphae and a plant fiber reinforcing material which is externally added and embedded into the pores in the pores of the porous core layer; according to the hypha mineral compounded bionic sand stabilization unit body and the preparation method thereof, mold pressing or 3D printing prefabrication is adopted, the structure is controllable, and standardized production and transportation are facilitated; and through a controllable fermentation and gradient dehumidification mineralization culture process, hyphae and minerals are ensured to be uniformly and fully compounded in pores, and the product quality is stable.

Provided are: a liquid crystal aligning agent which contains two or more polyamic acids and in which deterioration in liquid crystal aligning properties when stored at room temperature is suppressed; a liquid crystal alignment film obtained from the liquid crystal aligning agent; and a liquid crystal display element. The liquid crystal aligning agent is characterized by containing the following polymer (A) and polymer (B). Polymer (A): a polyamic acid (A) having a structural unit derived from a tetracarboxylic acid derivative and a structural unit derived from a diamine, the polyamic acid containing, as the structural unit derived from the tetracarboxylic acid derivative, a structural unit (a-1Ta) represented by formula (1Ta), and containing, as the structural unit derived from the diamine, a structural unit (a-1Da) represented by formula (1Da), at least a part of the terminal of the polyamic acid (A) contains a non-amino group, the non-amino group is a functional group represented by structural formula (E), and the presence rate of the terminal amino group in the polyamic acid (A) is 60% or less based on the total terminal of the polyamic acid (A). Polymer (B): a polyamic acid (B) having a structural unit derived from a tetracarboxylic acid derivative and a structural unit derived from a diamine, the polyamic acid including a structural unit (b-1Tb) represented by formula (1Tb) as the structural unit derived from the tetracarboxylic acid derivative, and including a structural unit (b-1Db) represented by formula (1Db) as the structural unit derived from the diamine. (Definition of each symbol is as defined in the specification) (Definition of each symbol is as defined in the specification) (Definition of each symbol is as defined in the specification) (Definition of each symbol is as defined in the specification)

The invention relates to the technical field of membrane separation, and discloses a polythiourea composite nanofiltration membrane as well as a preparation method and application thereof. The composite nanofiltration membrane comprises a bottom layer, a porous support layer and a polythiourea separation layer which are arranged in sequence, wherein the polythiourea separation layer comprises a structural unit A from polyamine and a structural unit B from a polyisothiocyano compound; wherein the structural unit A and the structural unit B are connected through a structure shown in a formula I, Ar1 is a residue obtained after a reaction of a compound containing polyisothiocyano groups, and Ar2 is a residue obtained after a reaction of polyamine. The separation layer structure of the polythiourea composite nanofiltration membrane contains C = S bonds, a large number of hydrogen bonds can be formed, the polythiourea composite nanofiltration membrane has excellent chemical stability, the structural stability of the composite nanofiltration membrane in a strong acid environment is remarkably improved on the premise that the separation performance of the composite nanofiltration membrane is guaranteed, and the acid resistance of the composite nanofiltration membrane is improved.

A cross-linked product obtained through crosslinking a polymer composition that contains a rubber component, an inorganic filler and a cross-linking agent and that satisfies conditions (a) to (c): (a) the rubber component contains a conjugated diene-based polymer (A) having, when composition ratios (molar ratios) in the conjugated diene-based polymer (A) of structural units represented by formulae (1) to (4) are p, q, r, and s, respectively, a value α represented by formula (i) of 0.80 or more and 0.97 or less;(b) a blending ratio of the conjugated diene-based polymer (A) is 10% by mass or more relative to a total amount of the rubber component; and (c) a blending ratio of the inorganic filler is 40 to 150 parts by mass relative to 100 parts by mass of the rubber component, wherein the Tg of the cross-linked product is −25° C. or lower.

The invention discloses a polymeric dispersant, a preparation method, a pigment paste and a photocuring composition, the polymeric dispersant is characterized in that the polymeric dispersant is a terpolymer formed by controllable free radical polymerization of a structural unit A, a structural unit B and a structural unit C. The structural unit A is derived from alkyl (meth) acrylate; the structural unit B is derived from polyethylene glycol (methyl) acrylate; and the structural unit C is derived from an N-acryloyl carbazole monomer. The polymeric dispersant aims to overcome the defect that the flexibility of the anchoring group connection mode in the existing carbazole dispersant is too large, and the N-acryloyl carbazole monomer with an optimized structure and a ternary polymerization framework are adopted to realize more efficient and lasting anchoring with the pigment surface, so that the flocculation problem is solved, and the super-stable dispersion is realized.

The invention provides a cleaning device with an adjustable screening behavior suitable for densely-planted corn, and belongs to the field of corn harvesting machinery. Comprising an upper screen box, a shaking plate, a centrifugal fan, a crank connecting rod mechanism and a lower screen box, the centrifugal fan is fixedly connected with a harvester, the shaking plate is arranged above the centrifugal fan, one end of the shaking plate corresponds to a discharging port of a threshing device, the other end of the shaking plate is provided with the upper screen box, and the lower screen box is arranged below the upper screen box. The ends, close to the centrifugal fan, of the upper screen box and the lower screen box are connected through crank connecting rod mechanisms, the crank connecting rod mechanisms are symmetrically arranged on the two sides of the upper screen box and the two sides of the lower screen box, and a structural unit of the vibrating screen with the adjustable screen penetrating behavior is composed of an upper-section screen plate, a middle-section screen plate, a lower-section screen plate and an inclination-angle-adjustable screen plate. The throwing force of the front end area of the vibrating screen on mixture particles and the vertical speed of air flow on the screen are increased, the separation effect of impurities and grains is promoted, the grain penetrating through the screen is improved, and the low-loss and high-cleanliness purposes of corn grain cleaning are achieved.

A long-persistent luminescence emitter containing a polymer that contains, relative to the total molar amount of an electron donor structural unit and an electron acceptor structural unit therein, 70 mol % or more of an electron donor structural unit and less than 30 mol % of an electron acceptor structural unit, or containing a polymer that contains, relative to the total molar amount of an electron donor structural unit and an electron acceptor structural unit therein. 70 mol % or more of an electron acceptor structural unit and less than 30 mol % of an electron donor structural unit. The emission decay after stopping light irradiation to the emitter is power law decay.

The invention belongs to the technical field of plant polysaccharides, and particularly discloses a ganoderma lucidum spore polysaccharide, a preparation method and application of the ganoderma lucidum spore polysaccharide in preparation of medicines for treating tumors. The ganoderma lucidum spore polysaccharide comprises a repetitive structure unit as shown in a formula (I), is a novel uniform-structure polysaccharide separated from ganoderma lucidum spore powder for the first time, has an anti-tumor effect, and is expected to be developed into a new anti-tumor medicine. The preparation method is simple and easy to operate, high in yield, mild in condition and suitable for large-scale production and application.

The invention relates to the field of adsorption materials, and discloses a lithium ion adsorbent and a preparation method and application thereof. The lithium ion adsorbent comprises a polyvinyl chloride molecular chain and a polymer molecular chain A, wherein the polymeric molecular chain A comprises a structural unit I from crown ether containing vinyl and a structural unit II from a vinyl silane modified lithium ion sieve. The vinyl silane modified lithium ion sieve in the lithium ion adsorbent can be connected with a polymer molecular chain through a chemical bond, so that the lithium ion sieve can be uniformly dispersed on a polymer skeleton, and the lithium ion adsorbent has excellent structural stability, high adsorption capacity and high magnesium-lithium selectivity; and the solution loss rate of the lithium ion sieve is obviously reduced.

The invention provides a solid electrolyte and a battery. The solid electrolyte comprises polythionocarbamate, polyacrylonitrile and a lithium salt, wherein the polythionocarbamate comprises a thiocarbamate structural unit. In the solid electrolyte provided by the invention, amino groups in a thiocarbamate structural unit in the polythionocarbamate and cyano groups in polyacrylonitrile form hydrogen bonds, so that the polythionocarbamate and the cyano groups in the polyacrylonitrile have good compatibility, the crystallinity of the polyacrylonitrile can be effectively reduced by blending the polythionocarbamate and the polyacrylonitrile, and the flexibility of the solid electrolyte is improved; and meanwhile, the solid electrolyte has relatively good mechanical properties. Particularly, sulfur atoms in a thiocarbamate structural unit in the polythionocarbamate contribute to promoting lithium ion transmission and improving the ionic conductivity, and due to the interaction of hydrogen bonds formed by the polythionocarbamate and polyacrylonitrile, the transmission rate of lithium ions can be further improved.

The invention provides a polyhydroxyalkanoate composition as well as a preparation method and application thereof. The polyhydroxyalkanoate composition comprises at least two kinds of copolymers of 3-hydroxybutyrate and 4-hydroxybutyrate. The at least two copolymers of 3-hydroxybutyrate and 4-hydroxybutyrate at least comprise one segmented copolymer of 3-hydroxybutyrate and 4-hydroxybutyrate, and in the segmented copolymer, the mass percentage content of a 4-hydroxybutyrate structural unit is 0-20%; the at least two copolymers of the 3-hydroxybutyrate and the 4-hydroxybutyrate at least comprise a random copolymer of the 3-hydroxybutyrate and the 4-hydroxybutyrate. The polyhydroxyalkanoate composition has good strength and toughness, the post-brittleness is also obviously improved, and meanwhile, the polyhydroxyalkanoate composition also has good processability and migration resistance.

Provided is a resin comprising a polycarbonate structural unit represented by formula (UN1) and a terminal structure having a vinyl group (with the proviso that any polycarbonate structural unit represented by formula (A1) and any terminal structure represented by formula (A2) are excluded). [In formula (UN1), Ux is a single bond or a divalent group, R1 and R2 are each independently a substituent, n is 0, 1, 2, 3, or 4, m is 0, 1, 2, 3, or 4, and * indicates a linking bond. Symbol * in formula (A1) indicates a linking bond and symbol * in formula (A2) indicates a linking bond to the repeating unit located at an end of the resin.]

The invention discloses a battery, a positive pole piece, slurry, a dispersing agent, a preparation method and electric equipment. The battery comprises a positive electrode plate, the positive electrode plate comprises a current collector and a positive electrode material layer arranged on at least one side of the current collector, the positive electrode material layer comprises a positive electrode active material and a dispersant, the dispersant comprises a polyester compound, the polyester compound comprises a structural unit A and / or a structural unit B, the chemical formula of the structural unit A is shown in the specification, and the chemical formula of the structural unit B is shown in the specification. R1 and R2 are respectively selected from at least one of C0, a C1-C18 alkyl group and a C6-C18 aryl group; and R3 and R4 are respectively selected from at least one of H, C1-C18 alkyl groups, C6-C18 aryl groups and ester groups. The dispersing agent can improve the dispersibility of the positive electrode slurry and improve the uniformity and flexibility of the positive electrode plate, so that the battery has relatively high capacity and stability.

The invention belongs to the technical field of high polymer materials, and particularly relates to a fluorescent liquid crystal polyurethane material as well as a preparation method and application thereof. According to the invention, hydroxyl and a flexible spacer-CH2-are introduced to cyanostilbene to synthesize a dihydroxyl-containing cyanostilbene compound as a dihydroxyl fluorescent liquid crystal monomer. A linear polyurethane material is prepared by taking a dihydroxyl fluorescent liquid crystal monomer and diisocyanate as raw materials, and a structural unit of cyanostilbene is directly introduced into a main chain structure of polyurethane in a chemical bonding manner, so that fluorescent / liquid crystal units are uniformly and stably distributed in a polymer main chain; the fluorescent liquid crystal polyurethane material integrating high mechanical property, good processability and stable fluorescence characteristic is obtained. The fluorescent liquid crystal polyurethane material can provide a multifunctional solution in wider fields of data storage, coding anti-counterfeiting, intelligent sensing, flexible electronics, shape memory materials, photoelectric display devices, optical fiber communication, biomedicine and the like.

Disclosed is a polyurethane containing a structural unit (A) derived from an aromatic compound having an isocyanate group with an average number of functional groups of 2.1 or more and a structural unit (B) derived from a polyalkylene ether glycol. It is possible to provide a polyurethane for a heat storage material having good heat storage properties and heat resistance, excellent moldability, and good shape retainability against heating and cooling, a heat storage material containing the polyurethane, and a heat storage molded body.

The invention discloses a novel phosphorus-containing macromolecular flame retardant and a preparation method and application thereof, the flame retardant is a polymer with a general formula (I), the main chain of the flame retardant is composed of an olefin-containing phosphonate structural unit, and the side chain R2 is a phosphonate group or a phosphonate metal salt group. The preparation method comprises the following steps: firstly, carrying out reaction on trialkyl phosphite and halogenated olefin containing active groups to efficiently prepare a functional monomer containing polymerizable double bonds and phosphonate side chains; then carrying out free radical polymerization to obtain a macromolecular polymer; the phosphonate can be further partially or completely hydrolyzed and complexed with multivalent metal ions to form the flame retardant with an ionic cross-linked structure. The macromolecular flame retardant is high in phosphorus content, good in thermal stability and excellent in compatibility with a polymer matrix, can play a flame-retardant role in a condensed phase and a gas phase at the same time, and effectively overcomes the problems that a micromolecular flame retardant is easy to migrate and poor in durability, and the mechanical property of a matrix material is reduced. The preparation method is efficient, controllable and suitable for continuous production.

The invention discloses a polyolefin self-repairing material and a preparation method thereof, a main chain of the polyolefin self-repairing material contains structural units shown in a general formula (I) and a general formula (II), a side chain of the polyolefin self-repairing material contains a structural unit shown in a general formula (III), the main chain and the side chain are connected through a covalent bond, in the formulas, x and y are molar percentages of the structural units in the main chain, and in the formulas, x and y are the molar percentages of the structural units in the main chain. X and y are positive numbers satisfying x > 0, y > 0, x > y, and 80% < = x + y < = 100%; r is a halogen atom, and R1 and R2 are aliphatic methylene chains or aromatic groups with the carbon atom number of 1-10; and R3 is amino, hydroxyl or carboxyl. The polyolefin self-repairing material has both a physical effect and a chemical effect, the self-repairing time of the material can be shortened, and the self-repairing efficiency is improved. Meanwhile, dynamic chemical bonds endow the material with a cross-linked structure, and the mechanical property of the material can be improved.

The application discloses a kind of binder, ceramic diaphragm and its secondary battery.The binder includes first polymer and second polymer, the first polymer and the second polymer are connected by chemical bond;The first polymer is polyacrylate polymer or SBR polymer containing first self-crosslinking structural unit, the Tg of the first polymer is ≤20 ℃, the second polymer is polyacrylic acid polymer or polyacrylamide polymer containing second self-crosslinking structural unit, the Tg of the second polymer is ≥80 ℃.The first polymer of low Tg is resistant to water and oil, but the heat resistance is generally, mainly plays the role of bonding, high Tg second polymer is resistant to oil and not resistant to water, mainly plays the role of heat resistance and improves electrolyte wettability, and by the interaction of first crosslinking structure and second crosslinking structure, so that binder simultaneously has excellent water and solvent resistance and heat resistance, and the affinity of electrolyte is better.

The invention discloses a graft polymer and a preparation method and application thereof.The graft polymer comprises a structural unit I from graphene oxide, a structural unit II from a monomer A and a structural unit III from a monomer B. The value of the carbon element and the oxygen element of the graphene oxide is not larger than 2.5; the monomer A is a monomer containing a sulfonic acid group; the monomer B is a propenyl monomer containing a rigid group; the viscosity average molecular weight of the graft polymer is 75,000 to 120,000. The graft polymer disclosed by the invention can be used as an ultrahigh-temperature salt-resistant shear strength improving agent for water-based drilling fluid, the temperature resistance can reach 240 DEG C or above, the salt resistance can reach saturation, and the influence on the plastic viscosity of the drilling fluid is less while the shearing force of the drilling fluid is increased.

The invention discloses heat-resistant polymethyl methacrylate, a preparation method thereof and an optical film. The heat-resistant polymethyl methacrylate comprises a methyl methacrylate repetitive unit, a glutarimide repetitive unit and an N-methyl methacrylamide repetitive unit, and the sum of the number of the glutarimide constitutional unit and the number of the N-methyl methacrylamide constitutional unit is 1-20 mol% of the total number of the constitutional units. The glutarimide structural unit can be obtained by further cyclization reaction of an N-methyl methacrylamide structural unit, and the cyclization rate can be increased to 80-90% by adding a cyclization accelerator such as triethylamine, so that the thermal stability of the resin is improved, and the water absorption rate is reduced. The material can be used for preparing an optical film, has excellent heat resistance and moisture resistance, and is suitable for the field of optical display.