874 results about "Methylene" patented technology

The invention provides a photosensitive resin composition containing an anthracene methyl modified melamine photosensitizer, a photosensitive dry film and application of the photosensitive dry film, the photosensitizer adopts a melamine skeleton to connect three anthracene 9-methyl structures, and through a rigid structure of the melamine skeleton and a methylene bridging (-CH2-An) design of an anthracene group, the photosensitive resin composition has the remarkable advantages that the methylene bridging structure can be used for preparing a photosensitizer, and the photosensitizer can be used as a photosensitizer for photosensitization of the anthracene methyl modified melamine photosensitizer. The breakage of carbon-oxygen bonds on alkoxy caused by p-pi conjugation is avoided, so that the migration of small molecular fragments after initiation is reduced, permeable crystallization to a polyethylene protective film is effectively inhibited, and the risk of short circuit of a line is remarkably reduced; the light quantum yield can be greatly improved by introducing a plurality of light sensing units; the melamine skeleton is used, so that the adhesive force of the initiation system on the metal foil surface can be effectively improved; in addition, the photosensitizer also shows excellent solubility and formula compatibility, and can be widely applied to the photocuring fields of dry films, paints, coatings, printing inks, molding materials and the like.

The invention relates to the technical field of dielectric materials, and discloses polyimide, a polyimide film and a preparation method and application thereof, the polyimide is obtained by a polymerization reaction of a dianhydride monomer and a diamine monomer, the diamine monomer comprises a methylene bridging group and a phenyl group with a substituent group, and the methylene bridging group is a phenyl group with a substituent group. The substituent group at least comprises one methyl group. The molecular twisted conformation lock structure provided by the invention not only can improve the tolerance of polyimide, but also can doubly inhibit intrachain and inter-chain charge migration of the dielectric film, so that the dielectric film still has extremely high energy storage density and energy storage efficiency at a service temperature close to a glass-transition temperature.

The invention provides a photosensitive resin composition containing an anthracene methyl quaternary ammonium salt photosensitizer and application of the photosensitive resin composition, a structural main body anthracene ring of the photosensitizer is introduced into methylene substituted by a quaternary ammonium group at a position 10 and / or a position 9, and an acid radical or halogen is adopted as an equilibrium anion; compared with a commercially available anthracene photosensitizer, the photosensitizer has excellent fat solubility and good water solubility through introduction of the quaternary ammonium salt on the premise that the photobleaching property is retained, great potential is brought to formula design of the photosensitive composition, and development waste in a later development process can be greatly reduced; the method can be widely applied to the photo-curing fields of dry films, paints, coatings, printing ink, forming materials and the like.

The invention discloses an environment-friendly titanium alloy etching solution as well as a preparation method and an etching method thereof, and relates to the technical field of printed circuit board production. The environment-friendly titanium alloy etching solution comprises the following components in percentage by mass: 10-30% of ammonium fluoride, 5-15% of an oxidant, 0.1-1% of a wetting agent, 0.3-1.5% of a stabilizer, 2-10% of an accelerator and 0.5-3% of a lateral erosion inhibitor. The stabilizer is selected from at least one of Tween 20, Tween 40 and Tween 85; and the accelerator is selected from at least one of sodium methylene dinaphthalene sulfonate, sodium dibutyl naphthalene sulfonate and dodecyl benzoate. The environment-friendly titanium alloy etching solution disclosed by the invention can selectively and quickly etch titanium alloy without corroding a copper surface and other metals, so that etching factors are effectively increased, and the problem of lateral erosion of a fine circuit is solved. Meanwhile, ammonium fluoride is used as a main agent of the etching liquid instead of hydrofluoric acid, so that the environmental pollution can be effectively reduced.

The invention discloses a super-strong mute building drainage pipe and a preparation method thereof, and relates to the technical field of high polymer materials. Comprising the following raw materials in parts by mass: 100 parts of high-density polyethylene, 5-7 parts of a cold-resistant toughening agent, 8-12 parts of a synergist, 8-10 parts of a sound insulation filler and 0.3-0.5 part of an antioxidant. By introducing the synergist prepared from the components such as polyamine polyether methylene phosphonic acid, zinc nitrate hexahydrate, magnesium nitrate hexahydrate and the like, the sound insulation, flame retardance and smoke suppression capabilities of the drainage pipe can be effectively improved; by introducing the sound insulation filler prepared from the modified halloysite nanotubes, hydroxyl-terminated polydimethylsiloxane, aziridine cross-linking agent and the like, the sound insulation, flame retardance and smoke suppression capabilities of the drain pipe are further improved. Therefore, the drainage pipe prepared by the invention has a wider application prospect.

An integrated structure pickleball paddle and a preparation process thereof are provided, where the pickleball paddle includes a paddle body, an edge banding, and a handle, where the edge banding and the paddle body are fused into an integrated structure by hot pressing, where the material of the edge banding is a modified TPU composite material, where the modified TPU composite material includes the following raw materials in parts by mass: 90-100 parts of modified TPU, 9-14 parts of polyvinyl fluoride, 20-30 parts of epoxy resin, 10-20 parts of ABS resin, 5-10 parts of modified nano-silicon dioxide, 0.3-0.6 parts of antioxidant, 0.2-0.5 parts of fluidity aid, 4-9 parts of 4,4′-methylene-bis(2-chloroaniline), and 3-7 parts of silicone oil. The edge banding and the paddle body are hot pressed and fused into an integrated structure, the edge banding will not fall off, and the comprehensive performance of the edge banding is better.

The invention belongs to the field of daily chemicals, and discloses a preparation method of a sunscreen composition, which comprises the following steps: step 1, mixing and dispersing sodium stearoyl glutamate, a part of a thickener, a part of an alcohol solvent and a part of water; step 2, adding a sun-screening agent into the mixture obtained in the step 1; 3, grinding the mixture obtained in the step 2; 4, emulsifying and homogenizing the residual thickening agent, the residual alcohol solvent, the residual water and the mixture obtained in the step 3; the sun-screening agent contains methylene bis (benzotriazolyl) tetramethyl butyl phenol; the weight ratio of the sodium stearoyl glutamate to the methylene bis-benzotriazolyl tetramethyl butyl phenol is (2-7): (45-55). According to the sunscreen composition disclosed by the invention, wide experimental verification shows that the sodium stearoyl glutamate and the methylene bis-benzotriazolyl tetramethyl butyl phenol have obvious sunscreen synergy. Meanwhile, the invention also discloses the composition and application thereof.

The invention belongs to the technical field of organic radiation luminescence and radiation imaging, and discloses an aggregation-induced delayed fluorescence (AIDF) type organic scintillator material and a preparation method thereof, and a preparation method and application of a flexible organic scintillation film. The molecular structure of the material comprises carbonyl, methylene, sulfuryl and other connecting units, phthalonitrile is used as an acceptor unit, carbazole is used as a donor unit, an aggregation-induced excitation state is formed through space charge transfer among molecules, efficient AIDF luminescence and large Stokes shift characteristics are realized, the self-absorption phenomenon is effectively avoided, and the luminescent efficiency is improved. The X-ray fluorescence probe is suitable for a luminescence process under an X-ray excitation condition, the sensitivity of X-ray detection is remarkably improved, and the lowest detection limit can reach 276nGy.s <-1 > and is far superior to the 5.5 mu Gy.s <-1 > standard required by medical diagnosis. Besides, the flexible scintillator film prepared based on the material system radiates and emits light within the waveband range of 450-750 nm and is perfectly matched with the response area of a silicon-based detector, X-ray imaging with the high signal-to-noise ratio is achieved, and the imaging resolution is as high as 20.01 lp.mm <-1 >.

Provided is a photosensitive resin composition having excellent low-temperature curability and capable of providing a cured resin film having sufficient solvent resistance or sufficient hardness. Also, provided are a color filter having excellent solvent resistance or excellent hardness, and an image display element having same. A photosensitive resin composition according to the present invention contains a copolymer (A), a reactive diluent (B), a photopolymerization initiator (C), and a solvent (D).　The copolymer (A) contains a structural unit (a), a structural unit (b), and a structural unit (c). The structural unit (a) has at least one selected from among an active methylene group having an alkoxycarbonyl group attached thereto, and an active methine group having an alkoxycarbonyl group attached thereto. The structural unit (c) has an acid group.

The invention relates to the field of water treatment, and discloses a scale and corrosion inhibitor for seawater circulating cooling water, which is prepared from phosphonic acid grafted maleic anhydride-acrylic acid copolymer, hydroxyethylidene diphosphonic acid, amino trimethylene phosphonic acid, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N- The anti-corrosion coating is prepared from the following raw materials: N, N-diethylaminomethyl-benzotriazole, gamma-aminopropyltriethoxysilane, zinc salt and a polyoxyethylene-polyoxypropylene block copolymer. The core of the invention is that all the raw material components form the thermo-sensitive polyelectrolyte compound through a self-assembly process. The compound is stably dispersed at low temperature by utilizing the cloud point effect of the block copolymer, and is subjected to phase change and preferential deposition on a high-temperature heat exchange surface, so that targeted and efficient delivery of various active components is realized. According to the invention, the problems of incompatibility of components and poor stability of a traditional compound agent are solved, the product has excellent storage stability, and efficient and synergistic corrosion and scaling control can be realized under high-temperature and high-salinity working conditions.

The present invention provides a composition for forming a gel polymer electrolyte which includes a lithium salt; an organic solvent; and a crosslinking compound represented by Formula 1. wherein in Formula 1, L1, L2, L3, and L4 are each independently selected from a direct bond or an alkylene group having 1 to 3 carbon atoms, L5 and L6 are each independently an alkylene group having 1 to 20 carbon atoms in which at least one methylene group is optionally substituted with an ether group and at least one hydrogen is substituted with fluorine, and R1 and R2 are each independently selected from hydrogen, an alkyl group having 1 to 3 carbon atoms, or a halogen.

This application relates to the field of microbial fermentation technology, and specifically discloses an N-hydroxyamino-N'-acetylguanine blue, its fermentation method and application. The chemical name of the N-hydroxyamino-N'-acetylguanine blue is N-(5'-hydroxyamino-2,6,2',6'-tetraoxo-1,6,1',6'-tetrahydro-2H,2'H-[3,3'] bipyridylmethylene)-acetamide, and the molecular formula is C 12 H 10 O6N4; compared with N-acetylguanine blue, the absorption of N-hydroxyamino-N'-acetylguanine blue is deeper in color at UV611, and at the same time, the formation of hydrogen bonds with amino groups on the fiber can enhance the dyeing property of the dye on the fiber and improve the wash fastness.

The invention belongs to the technical field of textile pretreatment processes, and particularly discloses a low-temperature washing-free short-process pretreatment process which comprises the following steps: (1) padding a fabric in a working solution, and stirring for 10-12 hours at 20-25 DEG C. The working solution comprises the following raw materials: a scouring agent, an alkali-resistant penetrant OEP-70, hydrogen peroxide, sodium silicate, ethylenediamine tetra (methylene phosphonic acid) pentasodium salt, caustic soda and water; (2) adding a water-free washing agent into the fabric subjected to padding treatment, and heating for 10-15 minutes at the temperature of 98-100 DEG C; (3) carrying out deoxidization treatment on the treated fabric; (4) immersing the treated fabric into the complex liquid, and stirring for 20-25 minutes at the temperature of 40-45 DEG C; the composite liquid is prepared from sodium dodecyl sulfate, modified chitosan, carboxymethyl cellulose, modified plant ash, polyethylene glycol and water. The fabric treated by the method is low in water consumption and high in dyeing efficiency and dye uptake, and the quality of the fabric is improved.

The invention discloses a 4, 4 '-bis (omega-alkenyl thioether) diphenyl sulfide monomer and a preparation method, the structural general formula of the 4, 4'-bis (omega-alkenyl thioether) diphenyl sulfide monomer is shown in the specification, n represents the number of methylene and is a positive integer, n = 1-10, the refractive index of a polymer obtained after the monomer and 4 '4-dimercapto diphenyl sulfide are polymerized is larger than 1.65 and smaller than 1.8, diffraction efficiency is remarkably improved, the preparation method is easy to operate, and the preparation method is suitable for industrial production. The invention further provides a photopolymer type holographic recording medium containing the monomer and a preparation method of the photopolymer type holographic recording medium, the sensitivity of the holographic recording medium is larger than 100 cm / mJ, the diffraction efficiency of a recording grating is larger than 95%, the refractive index modulation degree is larger than 0.1, the shrinkage rate is lower than 1%, and the preparation method is simple, controllable and suitable for industrial production. The invention also provides a volume holographic grating containing the holographic recording medium, a holographic optical element and an optical device.

The invention relates to the technical field of organic synthetic chemistry, in particular to a preparation method of ethyl 2-n-butyl acetoacetate, which comprises the following specific steps: S1, preparation of a composite solid base catalyst, S2, synthesis of ethyl 2-n-butyl acetoacetate, S3, post-treatment of a reaction solution, and S4, separation and purification of a product. The preparation method has the following beneficial effects that the magnesium-aluminum composite oxide is used as a carrier, and the composite solid base catalyst loaded with potassium and lanthanum has relatively high catalytic activity and selectivity; the magnesium-aluminum composite oxide carrier has a relatively large specific surface area and rich alkaline sites, so that a good catalytic environment is provided for the reaction; as a main active component, potassium ions can effectively activate alpha-active methylene of ethyl acetoacetate and promote formation of negative ion intermediates; the introduction of lanthanum ions can adjust the electronic structure of the catalyst, enhance the stability of the active center and inhibit the occurrence of side reactions.

The invention discloses a preparation method of a conductive elastomer. The preparation method comprises the following steps: (1) mixing N-hydroxyethyl acrylamide, glycerol and choline chloride, heating and stirring to obtain a clear and transparent solution A; (2) adding furfuryl methacrylate and N, N '-(4, 4'-methylene diphenyl) bismaleimide into the solution A prepared in the step (1), heating and stirring to obtain a clear and transparent solution B; (3) adding a photoinitiator into the solution B prepared in the step (2), and stirring in a dark place to obtain a clear and transparent solution C; and (4) pouring the solution C prepared in the step (3) into a mold, and performing in-situ polymerization under ultraviolet irradiation to obtain the conductive elastomer. The conductive elastomer has excellent mechanical strength and toughness.

The invention relates to the technical field of high polymer materials, and discloses a preparation method of a modified master batch degradable material and application of the modified master batch degradable material in a packaging lunch box, and the modified master batch degradable material comprises the following components by mass: 75.0-93.8 parts of poly (butylene succinate); 5.0 to 20.0 parts of aliphatic series-aromatic copolyester; 1.0 to 4.0 parts of 1, 1 '-methylenebis-4, 1-phenylene-bismaleimide, and 1.0 to 4.0 parts of 1, 1'-methylenebis-4, 1-phenylene-bismaleimide; 0.5 to 2.0 parts of talcum powder; the method comprises the following steps: mixing dried poly (butylene succinate), aliphatic-aromatic copolyester, bismaleimide and talcum powder, performing reactive extrusion and melt mixing through a twin-screw extruder, and then cooling, pelletizing and drying the extrudate. Through specific components and a reactive extrusion process, a dynamic cross-linked network is formed by utilizing a Diels-Alder reaction, and the modified master batch degradable material of which the comprehensive mechanical property and the heat resistance are remarkably improved is prepared.

The invention provides a high-strength anti-ultraviolet regenerated PET fiber and a preparation method thereof. The preparation method comprises the following steps: in a nitrogen atmosphere, dissolving 2, 2 '-methylenebis [6-(benzotriazolyl)-tetramethylbutylphenol] and hexamethylene diisocyanate in N-methyl pyrrolidone, adding a catalyst for reaction, then heating to remove residual monomers, cooling, dropwise adding into ice methanol to separate out a product, washing, and carrying out vacuum drying to obtain an anti-ultraviolet auxiliary agent; the preparation method comprises the following steps: dissolving an anti-ultraviolet aid and hexamethylenediamine in an aprotic solvent, adding a catalyst, carrying out condensation reaction in a nitrogen atmosphere, and carrying out centrifugal washing and vacuum drying to obtain the anti-ultraviolet composite chain extender, the preparation method comprises the following steps: mixing an anti-ultraviolet composite chain extender with recycled PET fragments, adding an antioxidant, a hydrolysis-resistant solution and a lubricant, and carrying out blending spinning through a double-screw extruder to obtain the high-strength anti-ultraviolet regenerated PET fiber. According to the invention, through anti-ultraviolet-chain extension chemical bonding, the bottleneck that the strength and the function of the regenerated PET fiber are difficult to synergistically improve is broken through.

The invention belongs to the technical field of high-molecular polymer synthesis, and particularly relates to a high-performance special polyether material with a directionally-modified terminal group and a preparation method of the high-performance special polyether material. The preparation method comprises the following steps: sequentially grafting 4-bromobenzoate to methylene of crown ether and aminating bromine atoms to prepare an intermediate, and reacting amino of the intermediate with isocyanate-terminated polyether to form a urea bond, so that a terminal group of a polyether structure is chemically modified, and a special polyether material is endowed with separation performance; when the composite membrane is applied to a nanofiltration separation membrane, the water permeability can be remarkably improved, and magnesium ions and lithium ions can be efficiently and selectively separated. According to the invention, a terminal group of a polyether structure is chemically modified through a specific reaction, and the application potential of a special polyether material in emerging fields such as high-performance separation membranes is expanded.

The invention relates to the technical field of water treatment agents, and particularly discloses an anti-corrosion deoxidizing composite agent for geothermal well recharge water and a preparation method of the anti-corrosion deoxidizing composite agent. The invention relates to an anti-corrosion and deoxidizing composite agent for geothermal well recharge water. The anti-corrosion and deoxidizing composite agent comprises the following raw materials: 30-40 parts of double modified sodium sulfite, 10-20 parts of a corrosion inhibitor, 8-15 parts of a scale inhibitor, 5-10 parts of amino trimethylene phosphonic acid, 5-10 parts of etidronic acid, 3-8 parts of polyethylene glycol monomethyl ether acrylate and 40-50 parts of deionized water. The dual-modified sodium sulfite is obtained by sequentially modifying sodium sulfite with a silane coupling agent and acrylic acid. The corrosion-resistant and oxygen-removing composite agent has the advantage of being high in oxygen-removing efficiency stability, the corrosion-resistant and scale-inhibiting functions are synchronously and synergistically improved on the basis that the oxygen-removing efficiency stability is guaranteed, and the complex working condition requirements of geothermal well recharge are completely met.

The embodiment of the invention provides a preparation method of methylene-bridged substituted phenol substituted by hydroxyl ortho-hydroxymethyl, and the preparation method comprises the following steps: A1, reacting substituted phenol with formaldehyde in the presence of a Lewis acid catalyst to prepare a substituted salicylaldehyde compound (2); a2, carrying out condensation reaction on the substituted salicylaldehyde compound (2) in a system containing formaldehyde and a Bronsted acid catalyst to prepare a methylene-bridged substituted salicylaldehyde compound (3); and A3, reducing the methylene-bridged substituted salicylaldehyde compound (3) to prepare methylene-bridged substituted phenol (4) with hydroxyl ortho-hydroxymethyl substituted. According to the embodiment of the invention, the yield and the chemical purity of the prepared methylene-bridged substituted phenol substituted by hydroxyl ortho-hydroxymethyl can be improved. According to other embodiments of the invention, the invention also provides a preparation method of the polyphenol compound containing multiple phenol units.

The invention belongs to the field of food processing and safety, and provides a steam explosion improved grain processing byproduct and application thereof in preparation of low-GI coarse grain biscuits. The triticale bran is pretreated through a steam explosion (SE) technology, the content of soluble dietary fibers is increased by 53.63% under the conditions of 1.0 MPa and 90 s, and the content of free phytochemicals and the oxidation resistance are the highest; the color of the wheat bran is changed into dark brown / dark brown from light brown, the interior of the wheat bran is of a porous honeycomb structure, the water binding capacity and the swelling property are improved, and an infrared spectrum shows that methyl and methylene structures are damaged and tissues are loosened; the fatty acid value is remarkably reduced, the storage period and the shelf life are effectively prolonged, comprehensive improvement of nutritional ingredients, physicochemical properties, biological activity and storage characteristics is achieved, and remarkable technical advantages are achieved.

The present invention discloses a combined flotation regulator for high-mud lead-zinc oxide ores and its application method. The combined regulator consists of regulator A and regulator B in a mass ratio of 1:(3-10); regulator A is a high-molecular polysaccharide substance; regulator B consists of B1 and B2, with B1 being 80-90 parts by mass and B2 being 10-20 parts by mass; B1 is sodium silicate, and B2 is at least one of polyaminopolyether methylene phosphonic acid, polyepoxysuccinic acid, and 2-butanephosphonate-1,2,4-tricarboxylic acid. The application method is as follows: grinding the raw ore, sequentially adding sodium carbonate, regulator A, regulator B, and sodium sulfide for slurry mixing, and finally adding a collector for zinc oxide mineral flotation to obtain a zinc oxide coarse concentrate. The present invention can effectively recover zinc oxide minerals in high-mud lead-zinc oxide ores, the reagent components are non-toxic and harmless, the application method is simple, and it is convenient for large-scale production management.

The invention relates to the technical field of polyurethane modification, in particular to a xylylene diisocyanate composition as well as a preparation method and application thereof.The xylylene diisocyanate composition provided by the invention contains 1-1000 ppm of a compound shown in the formula (I), and resin prepared from the xylylene diisocyanate composition has excellent homogeneity, effectively inhibits stripes from occurring in the resin, and has the advantages of being good in mechanical property, good in mechanical property and the like. And the light transmittance consistency is obviously improved.

The invention provides a folic acid quality control product prepared by using an alternative matrix, and belongs to the technical field of medical detection. The folic acid quality control product is prepared from 5-methyltetrahydrofolic acid, 5, 10-methylenetetrahydrofolic acid and a substitute matrix, the alternative matrix comprises bovine hemoglobin, L-ascorbic acid and a glycine-hydrochloric acid buffer solution (pH 3.0). The alternative matrix can meet the matrix effect requirement and can stabilize the 5-methyltetrahydrofolic acid and the 5, 10-methylenetetrahydrofolic acid for a long time, and the matrix components can be obtained from commercial ways and are low in cost, so that the folic acid quality control product provided by the invention can be widely applied to production and use of folic acid detection reagents or kits, and has wide application prospects. The folic acid detection kit has important significance on market popularization and application of the folic acid detection kit.

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.

One embodiment of the present invention pertains to a resin composition, a cured object, or an electronic component. The resin composition contains: a polymer (A) having a structural unit represented by formula (a1-1); and a hydrogenated styrene-based thermoplastic elastomer (B). In formula (a1-1), Ra1 represents a divalent group represented by formula (a2), and Ra2 represents a substituted or unsubstituted divalent aromatic heterocyclic group. In formula (a2), Ara1 and Ara2 each independently represent a substituted or unsubstituted aromatic hydrocarbon group, L represents a single bond, -O-, -S-, -N(R8)-, -C(O)-, -C(O)-O-, -C(O)-NH-, -S(O)-, -S(O)2-, -P(O)-, or a divalent organic group, y represents an integer of 0-5, and Ra6 and Ra7 each independently represent a single bond, a methylene group, or an alkylene group having 2-4 carbon atoms.

The invention discloses a small molecular proteasome agonist as well as a preparation method and application thereof. According to the invention, cyclohexylamine is used as an initial raw material, and 3-(1-(benzo [D] thiazole-2-carbonyl)-2-(furan-2-methylene) hydrazone group)-N-cyclohexylpropanamide and N-cyclohexyl-3-(2-(furan-2-methylene)-1-(quinoline-2-carbonyl) hydrazone group) propanamide are prepared through a five-step reaction. The two compounds provided by the invention have good 20S proteasome agonistic activity and ischemic injury myocardial cell protection activity, do not have obvious cytotoxicity, and are expected to become effective choices for ischemic cardiomyopathy and other proteotoxic diseases.

The invention discloses a low-dielectric polyimide film based on a fluorine-containing triphenylmethane unit as well as a preparation method and application of the low-dielectric polyimide film, and the low-dielectric polyimide film is a novel polyimide material FPOPF-6FDA obtained by polymerizing a fluorine-containing triaryl methane diamine monomer and 4, 4 '-(hexafluoroisopropenyl) diphthalic anhydride. The fluorine-containing triarylmethane diamine monomer is preferably 4, 5-diphenyl-1, 3, 5-triazine. According to the invention, 4, 4 '-((4-fluoro-3-phenoxy phenyl) methylene)) bis (2-fluoroaniline) is used, specifically, 4, 4'-diaminotriphenylmethane is used as a functional core, a fluorine-containing group and a large-volume side chain group are introduced, and non-coplanar twisted conformation destroys close packing of molecular chains and increases the chain spacing, so that the effect of a charge transfer complex (CTC) is weakened, and the photoelectric conversion efficiency is improved. And the heat resistance and optical transparency of polyimide are maintained while the dielectric constant of the material is reduced.

The invention relates to the field of formula and method application of reinforcing slurry in tunnel excavation, in particular to a grouting material for soft and broken surrounding rock, a preparation method of the grouting material and pre-simulation equipment. The problems that an existing inorganic grouting material is long in setting time and prone to solidifying a cutterhead, and an organic grouting material is poor in setting time controllability, high in manufacturing cost and the like are solved. The coating provided by the invention is obtained by mixing a component A and a component B according to a volume ratio of 1: 0.78. The component A comprises water glass and a catalyst; and the component B is prepared from polymethylene polyphenyl polyisocyanate (PAPI), polyether polyol (DL-2000D) and octyl phthalate (DOP). The invention has the advantages of short gelling and curing time, strong cementing property, high compressive strength and better fluidity; the inorganic water glass is mixed with the organic polyurethane, and after reaction, the material is pollution-free, safe and environment-friendly; the requirements of weak surrounding rock on the reinforced grouting material in tunnel engineering can be met.