39 results about "Hydroxybenzotriazole" patented technology

The application discloses an antioxidant coating and a preparation method thereof, and relates to the technical field of coatings. The application first uses hydroxybenzotriazole to esterify and modify acrylic acid, and then uses the modified acrylic acid to prepare modified acrylic resin coating. The benzotriazole structure has high hardness and rigidity, and also has good ultraviolet absorption performance, which can reduce the degradation of the acrylic resin caused by ultraviolet rays and further improve the durability of the coating. The microcapsule wall material is modified by a hydrophobic compound, and then a new type of microcapsule wall material is prepared by coating an antioxidant. The microcapsule wall material modified by the hydrophobic compound can effectively prevent external moisture and oxygen from entering the microcapsule, improve the stability of the coating in a humid environment, and protect the antioxidant in the core material from the influence of the external environment. The antioxidant is slowly and continuously released in the coating, and the oxidation reaction of the coating is effectively inhibited for a long time. The antioxidant coating prepared by the application has the effects of wear resistance and durability.

The invention relates to a high-toughness anti-crack magnetic decorative film and a preparation method thereof. The decorative film is prepared from the following raw materials in parts by weight: 40 to 60 parts of poly (dihydrothiophene-vinyl ether) copolymer, 10 to 25 parts of shell layer self-assembly modified Fe3O4 nanosheets, 5 to 15 parts of polyether ester block elastomer, 0.5 to 2 parts of sodium dodecyl benzene sulfonate, 0.5 to 1.5 parts of fluorosilane coupling agent, 0.1 to 1.0 part of 2-hydroxybenzotriazole ultraviolet absorbent, 3 to 6 parts of bisphenol A type epoxy curing agent and 0.05 to 0.5 part of imidazole catalyst. The flexible copolymer is synthesized through copolymerization of dihydrothiophene and vinyl ether, the modified Fe3O4 nanosheets form a Fe3O4 structure through coprecipitation of ferric chloride and ferrous chloride and regulation and control of ammonia water, and shell self-assembly coating is carried out through tetraethoxysilane and a block micromolecule interface agent. The material has excellent tensile strength, elongation at break, magnetic adsorption force and cycling stability, and is suitable for the application fields of flexible magnetic films and high-adhesion decorations.

The present invention provides functionalized molybdenum disulfide nanosheets and a preparation method and application thereof. The preparation method comprises the following steps: mixing a solvent, 1 part by weight of thioctic acid, and 5 to 10 parts by weight of a first compound for 2 to 4 hours to obtain a mixture; adding 0.05 to 0.1 parts by weight of 1-hydroxybenzotriazole to the mixture, mixing for 24 to 48 hours, and drying to obtain an intermediate product; and ultrasonically treating or heat-treating the raw material-solution system to obtain the functionalized nanosheets, wherein the raw material-solution system comprises 5 to 10 parts by weight of molybdenum disulfide nanosheets, 1 part by weight of the intermediate product, and brine; and the first compound comprises an oxirane group and an alkylamine chain, wherein the alkylamine chain has 12 to 18 carbon atoms and the oxirane group has 2 to 15 carbon atoms. A nanofluid prepared from the functionalized molybdenum disulfide nanosheets can reduce oil / water interfacial tension, has good stability, significantly improves the recovery rate of low-permeability oil reservoirs, and reduces costs.

The present application relates to the technical field of paint, and discloses a preparation method of a spherical alumina-cordierite composite refractory paint composition, wherein 100 parts by weight of epoxy resin, 1-5 parts by weight of an amino-terminated polymer ultraviolet absorber, 15-28 parts by weight of a filler spherical alumina trihydrate and cordierite, 29-32 parts by weight of a curing agent and the like are stirred and uniformly mixed to obtain the spherical alumina-cordierite composite refractory paint composition.The polymer ultraviolet absorber contains an ortho-hydroxybenzotriazole group, which can improve the ultraviolet absorption characteristics and ultraviolet aging resistance of the paint.The polymer, as an absorber, contains a biphenyl structure with thermal stability, which is beneficial to improving the thermal decomposition temperature, heat resistance and water resistance after being co-cured with the epoxy resin.The addition of the spherical alumina trihydrate and cordierite improves the limiting oxygen index of the paint coating and improves the flame-retardant fire resistance.

The invention relates to the technical field of coatings, and discloses a preparation method of a spherical alumina-cordierite composite refractory coating composition, which comprises the following steps: uniformly stirring and mixing 100 parts by weight of epoxy resin, 1-5 parts by weight of amino-terminated polymer ultraviolet absorbent, 15-28 parts by weight of filler spherical alumina trihydrate and cordierite, 29-32 parts by weight of curing agent and the like; the spherical aluminum oxide-cordierite composite fireproof coating composition is obtained. The polymer ultraviolet absorbent contains an o-hydroxybenzotriazole group, so that the ultraviolet absorption characteristic and the ultraviolet aging resistance of the coating can be improved, and the polymer as the absorbent contains a biphenyl structure with thermal stability, so that the thermal decomposition temperature, the heat resistance and the water resistance and water resistance can be improved after the polymer is co-cured with the epoxy resin. Meanwhile, spherical alumina trihydrate and cordierite are added, so that the limit oxygen index of the coating is increased, and the flame-retardant and fire-resistant performance is improved.

The application provides a high-transparency silicone rubber material and a preparation method thereof. The silicone rubber material comprises the following raw materials in parts by mass: 100 parts of methyl vinyl phenyl rubber, 10-30 parts of modified white carbon black, 3-5 parts of vinyl MQ silicone resin, 4-6 parts of polymethyl hydrogen siloxane, 1-1.5 parts of vinyl hydroxyl silicone oil and 0.001-0.003 parts of platinum catalyst. The modified white carbon black is obtained by grafting benzotriazole silane coupling agent and silicone oil onto the modified white carbon black. The benzotriazole silane coupling agent is obtained by urethane reaction of hydroxy benzotriazole compound and isocyanate silane coupling agent. The silicone oil grafting silane coupling agent is obtained by addition reaction of hydrogen-terminated polydimethylsiloxane and vinyl silane coupling agent. The silicone rubber material has good transparency and light stability.

The invention discloses a copper-titanium etching solution, and relates to the technical field of microelectronic device manufacturing, and the copper-titanium etching solution comprises the following components by mass: 4.5-8.5% of ammonium persulfate; 1.5%-3.5% of urea peroxide; 1.0% to 2.0% of 1-hydroxybenzotriazole-5-carboxylic acid; 0.3% to 0.9% of 2-mercapto benzimidazole; 0.5% to 1.5% of sulfobutyl ether-beta-cyclodextrin; 0.8%-2.2% of L-aspartic acid-N, N-diacetic acid; 0.1% to 0.7% of iso-tridecanol polyoxyethylene ether; 0.05%-0.15% of ceric ammonium nitrate; 0.02% to 0.08% of sodium polyacrylate; and the balance of deionized water. According to the method, the matching problem of the etching rate is solved, the stability is improved, and substrate corrosion is avoided.

This invention provides an acid-resistant nutrient-carrying nanomicelles and its preparation method, comprising: (1) dissolving ursolic acid, 1-hydroxybenzotriazole, and 1-ethyl-(3-dimethylaminopropyl)carbodiimide hydrochloride in a solvent and stirring to obtain an activated ester; (2) reacting an amine-containing cationic polymer with the activated ester obtained in step (1) to obtain an amphiphilic cationic polymer; (3) mixing the amphiphilic cationic polymer with a lipid-soluble active substance in a good solvent, removing the good solvent by rotary reflux in the dark to obtain nutrient-carrying nanomicelles; and (4) mixing the polyanionic polymer solution with the nutrient-carrying nanomicelles in water to obtain acid-resistant nutrient-carrying nanomicelles. The nanomicelles prepared by this invention can withstand gastric digestion and gel and aggregate in the enteritis area of ​​mice by prolonging the intestinal retention time.

The invention provides an antioxidant solution, a copper foil, a pole piece and a lithium ion battery. The antioxidant solution comprises the following components in percentage by mass: 0.05-0.5% of a first compound, 0.1-0.3% of borax, 0.05-0.2% of tannic acid, 0.1-1% of a second compound, 85-88% of ethanol and 11-14.7% of water, the first compound is prepared from 1-hydroxybenzotriazole and / or 5-chloro-2-methylbenzotriazole, and the second compound is prepared from 1-hydroxybenzotriazole and / or 5-chloro-2-methylbenzotriazole; the second compound comprises ascorbic acid and / or titanyl sulfate. The anti-oxidation liquid provided by the invention does not contain a chromium element, is simple in component and strong in anti-oxidation capability, and has excellent cycle performance and safety performance when being applied to a lithium ion battery by applying a pole piece prepared from the copper foil containing the anti-oxidation liquid to the lithium ion battery.

The application discloses modified cotton fabric and a preparation method and application thereof, and relates to the field of textile fabrics.In the preparation of the modified cotton fabric, chitosan is pretreated by 2-bromoisobutyryl bromide, then acrylic acid and methyl acrylate are grafted and polymerized by an atom transfer radical polymerization method to obtain pre-modified chitosan, then the pre-modified chitosan is sequentially reacted with oxalyl chloride and 4-hydroxybenzotriazole to prepare modified chitosan; cotton fabric is ultrasonically pretreated by a sodium dodecyl sulfate solution, then sequentially reacts with 6-chlorohexanoyl chloride and N,N-dimethylallylamine to prepare pre-modified cotton fabric, and finally, the pre-modified cotton fabric is reacted with a modified liquid prepared from modified chitosan, dimethyl phosphite and 1,4-butanediol to prepare the modified cotton fabric.The modified cotton fabric prepared by the application has excellent ultraviolet resistance, antibacterial property, wrinkle resistance and flame retardance.

The invention belongs to the field of chemical analysis and testing, and particularly relates to a quinoline derivative coumarin fluorescent probe targeting tobramycin and a preparation method of the quinoline derivative coumarin fluorescent probe. The preparation method comprises the following steps: dissolving N1-(7-chloroquinoline-4-yl) ethane-1, 2-diamine and 7-(diethylamino) coumarin-3-formic acid in dichloromethane, adding condensing agents of 1-hydroxybenzotriazole (HOBT), 1-ethyl-(3-dimethylamino aldehyde) carbodiimide hydrochloride (EDCI) and triethylamine, carrying out a stirring reaction at room temperature, carrying out separation and purification on an obtained crude product through silica gel column chromatography, and carrying out recrystallization to obtain the 7-(diethylamino) coumarin-3-carboxylic acid-N-(7-chloroquinoline-4-yl) coumarin-3-carboxylic acid-N-(7-chloroquinoline-4-yl) coumarin-3-carboxylic acid-N-(7-chloroquinoline-4-yl) coumarin-3-carboxylic acid. The coumarin fluorescent probe DL containing the quinoline derivatives is obtained. The prepared coumarin fluorescent probe forms a complex under the participation of Cu < 2 + >, and tobramycin can be specifically and rapidly detected in deionized water.

The present invention relates to a method for preparing a modified hydrophobic excipient including the following steps: Step A. obtaining intermediate I or II from a hydrophobic natural compound with one to three hydroxyl groups or a hydrophobic synthetic compound with one to three hydroxyl groups and amino acid derivatives with amino protecting groups and different chain lengths acting as raw material; Step B. obtain intermediate III from an amino acid derivative and N-hydroxysuccinimide or 1-hydroxybenzotriazole acting as raw material and a dehydrating agent; and Step C. reacting the intermediate II and the intermediate III as raw material with an acid-binding agent under a dark condition to generate a modified hydrophobic excipient.

The invention provides an antibacterial and anti-mineralization material for softening dental calculus and inhibiting formation of dental calculus, a preparation method of the antibacterial and anti-mineralization material comprises the following steps: dissolving chitosan and / or carboxymethyl chitosan and 1-hydroxybenzotriazole in deionized water under a stirring condition to obtain a solution A; under the stirring condition, an organic additive solution and a 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride solution are dropwise added into the solution A obtained in the step 1), and a solution B is obtained; performing low-temperature dialysis on the solution B obtained in the step 2), and performing freeze drying to obtain a product C; under the stirring condition, adding the product C and lysozyme into deionized water, and reacting to obtain the antibacterial and anti-mineralization material for softening dental calculus and inhibiting formation of dental calculus. The material disclosed by the invention can be combined with the surface of residual dental calculus after periodontal basic treatment, surface plaque biofilm is removed, and rapid mineralization of the material is inhibited by combining calcium ions, cell colonization is promoted, and periodontal tissue recovery is promoted.

The invention relates to a photo-initiated synthetic aminophenol compound method and application, and belongs to the technical field of organic synthesis. The synthesis method comprises the following steps: deprotonating a 1-hydroxybenzotriazole compound under an alkaline condition, and carrying out cracking reaction under the excitation of visible light to generate a high-activity biradical intermediate which is unstable and can be rapidly tautomerized into a more stable nitrosobenzene anion intermediate; the intermediate further reacts with cyclohexenone substances to synthesize the aminophenol derivative in one step. The method is simple and efficient, simple and convenient to operate, free of transition metal and additional oxidizing agents, simple and easily available in raw material reagent, high in product yield and capable of realizing large-scale synthesis, and a new method is provided for rapidly synthesizing the aminophenol compound. The synthesized aminophenol compound has good antibacterial activity, and especially has huge potential in the aspect of preventing and treating anthracnose of tea trees.

The invention belongs to the field of chemical synthesis, and particularly relates to a deprotection reagent, a kit and application of the deprotection reagent and the kit. And an organic base. According to the deprotection reagent, organic unification of mild and efficient deprotection and key side reaction inhibition is achieved through the synergistic effect of the 1-hydroxybenzotriazole and the organic base, specifically, the 1-hydroxybenzotriazole can effectively inhibit amino acid racemization, and more importantly, by capturing a beta-elimination reaction intermediate, the deprotection efficiency of the deprotection reagent is improved. And a protection mechanism aiming at phosphorylated amino acid is constructed together with organic alkali, so that a solid foundation is laid for preparing complex phosphorylated protein / polypeptide with high purity and accurate structure.

The preparation method comprises the following steps: by taking 3, 4-dihydroxyphenylacetic acid and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide as raw materials, carrying out pre-activation reaction in an organic solvent, and adding 1-hydroxybenzotriazole to carry out activation reaction, so as to obtain a reaction product; slowly adding the reaction product into a protamine buffer solution, carrying out amidation coupling reaction, and purifying and drying to obtain the protamine-DOPAC conjugate. According to the protamine-DOPAC conjugate, the residence time of the exosome in a uterine cavity can be prolonged, and the action efficiency of the exosome in an endometrium can be improved. The protamine-DOPAC conjugate provided by the invention has an application prospect in the drug delivery direction.

The invention relates to the technical field of high polymer materials, in particular to a high-strength weather-resistant composite material, a preparation method and application of the high-strength weather-resistant composite material to protection of wind power generation equipment. The preparation method of the high-strength weather-resistant composite material comprises the following steps: reacting N-hydroxybenzotriazole with cyanuric chloride to prepare an intermediate A; reacting the intermediate A with biphenyl-4, 4 '-dithiol to obtain an intermediate B; and reacting the intermediate B with 4, 4 '-di [2-(1-propenyl) phenoxy] benzophenone to prepare the composite ultraviolet light absorber. Carrying out grafting reaction on the composite ultraviolet light absorber and POE (Polyolefin Elastomer) under the action of an initiator to prepare a composite modifier; the composite modifier and PA66 are subjected to melt blending, extrusion, cooling and grain-sized dicing, and the composite material is prepared. The composite material is high in strength, strong in ultraviolet aging resistance and good in weather resistance and low temperature resistance.

The invention provides an extracting agent for efficiently separating and extracting scandium and a preparation method thereof, and relates to the field of solvent extraction. The preparation method comprises the following steps: mixing DMF (Dimethyl Formamide), an aminopolycarboxylic acid chelating agent, triethylamine and 1-hydroxybenzotriazole in proportion under an ice salt bath condition, uniformly stirring, adding 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride in batches for activation, then adding aliphatic secondary amine, heating, and reacting for 20-30 hours to obtain a reaction solution; after the reaction liquid is cooled, suction filtration is performed, deionized water is added, and ethyl acetate is adopted for extraction; then washing, drying and carrying out rotary evaporation to obtain an oily substance; adding petroleum ether into the oily substance, heating and stirring, cooling, removing impurities, and eluting to obtain the extracting agent. The extracting agent prepared by the method only contains four elements of C, H, O and N, meets the standard of an environment-friendly green extracting agent, not only can realize efficient extraction of scandium ions in a wider acidity range, but also has environment-friendly performance, and has good economic value.

The present application relates to the technical field of bioengineering, and particularly relates to a neurotensin cyclic peptide and a preparation method and application thereof.The present application comprises the following steps: preparing a peptide chain; then washing the peptide chain, adding a mixed solution of trifluoroethanol and dichloromethane, oscillating, and filtering to obtain a linear peptide crude product; adding a dichloromethane solution containing hydroxybenzotriazole, benzotriazole-1-yl-oxy-tris-pyrrolidino-phosphonium hexafluorophosphate and diisopropylethylamine to the linear peptide crude product, performing a cyclization reaction, reducing pressure concentration and purification to obtain a cyclization peptide crude product; after C-terminal amidation and side chain deprotection of the cyclization peptide crude product, separating and purifying to obtain the neurotensin cyclic peptide. By constructing a more stable and more active NST cyclic peptide, not only the convenience of subsequent NST related research is improved, but also the present application can serve as a research basis for developing a new potential drug for treating obesity and eating disorders (such as binge eating disorder).

The application discloses a kind of peroxidase / laccase-like nanoscale enzyme colorimetric / fluorescence dual-mode rapid detection sodium dehydroacetate method, the method with 1-hydroxybenzotriazole (HOBT) as organic ligand, select Cu and Zn two transition metals as central ion, Cu / Zn-MOF material is synthesized.The linear range of colorimetric mode is 0.067-12 μg / mL, and the detection limit is 0.020 μg / mL;The linear range of fluorescence mode is 0.01-22 μg / mL, and the detection limit is 0.041 μg / mL, the sensor is applied to the recovery experiment of DHA in food sample, the recovery rate is between 92.1%~106.4%, and RSD is not more than 5%, verify that the analysis method has good stability, reliability and reproducibility.

The present invention belongs to the field of pharmaceutical synthesis and specifically provides a method for preparing a folic acid-coupled boron-containing compound. The method comprises reacting a compound of Formula I with a compound of Formula II in the presence of a carbodiimide condensing agent and a hydroxybenzotriazole compound to obtain a folic acid-coupled boron-containing compound of Formula III. The method further comprises using a sulfonic acid as a catalyst. Compared with the prior art, the technical solution of the present invention can obtain a high-purity, high-yield compound of Formula III. The reaction is clean and thorough, with no residual raw materials, and the yield can reach 91%, the purity can reach over 98%, and the formation of impurity A is effectively avoided. In addition, the technical solution of the present invention has mild reaction conditions, is easy to operate, and is more simple and efficient, making it more suitable for expanded industrial production.

The invention discloses a peroxidase-like / laccase nano-enzyme colorimetric / fluorescent dual-mode rapid sodium dehydroacetate detection method, which comprises the following steps: synthesizing a Cu / Zn-MOF material by taking 1-hydroxybenzotriazole (HOBT) as an organic ligand and selecting two transition metals Cu and Zn as central ions; the linear range of the colorimetric mode is 0.067-12 [mu] g / mL, and the detection limit is 0.020 [mu] g / mL; the linear range of a fluorescence mode is 0.01-22 [mu] g / mL, the detection limit is 0.041 [mu] g / mL, the sensor is applied to a standard recovery experiment of DHA in a food sample, the recovery rate is 92.1-106.4%, the RSD does not exceed 5%, and it is verified that the analysis method has good stability, reliability and reproducibility.

The present invention discloses a preparation method and application of a pH-responsive Cecropin B antimicrobial polypeptide. The preparation method comprises the following steps: S1. reacting 2,3-dimethylmaleic anhydride and 1-hydroxybenzotriazole as raw materials in the presence of an acid-binding agent and a catalyst to obtain a ring-opening condensation product; and S2. grafting the ring-opening condensation product with cecropin B as raw materials, followed by purification and dialysis to obtain the pH-responsive Cecropin B antimicrobial polypeptide. The pH-responsive Cecropin B antimicrobial polypeptide can release the Cecropin B antimicrobial polypeptide at a specific point after long circulation, has high stability, and does not produce drug resistance.

The invention discloses [1] rotaxane molecular compounds and a synthetic method thereof, and the synthetic method comprises the following steps: under the protection of inert atmosphere, carrying out nucleophilic substitution reaction on a compound A, sodium hydride and ethyl bromoacetate in N, N-dimethylformamide to obtain a compound B; performing nucleophilic substitution reaction with pyridine and trifluoromethanesulfonic anhydride to obtain a compound C; then carrying out a coupling substitution reaction with a compound D, bis (triphenylphosphine) palladium dichloride and 2-dicyclohexylphosphine-2 ', 4', 6 '-triisopropyl biphenyl to obtain a compound E; performing hydrolysis reaction with sodium hydroxide to obtain a compound F; under the protection of inert atmosphere, carrying out nucleophilic substitution reaction on the compound G, the compound H and potassium carbonate in N, N-dimethylformamide to obtain a compound I; performing hydrazinolysis reaction on the compound I and hydrazine hydrate to obtain a compound J; and under the protection of inert atmosphere, carrying out condensation reaction on the compound J, a compound F, 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride and 1-hydroxybenzotriazole to obtain the [1] rotaxane molecular compound.

This invention belongs to the field of amino acid derivative preparation technology, and relates to a method for preparing biotinylated amino acid derivatives. The method involves adding amino acids and a base to biotin D-biotin, stirring, then adding a catalyst and a solvent, stirring the reaction, drying the solvent, extracting, and purifying to obtain the biotinylated amino acid derivative. The catalyst is 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and 1-hydroxybenzotriazole. This invention does not require metal catalysis or highly active acyl chlorides. Under the action of a base, the amino acidification of biotin D-biotin is achieved under mild conditions. This method is simple to operate, has mild reaction conditions, a wide range of applicable substrates, inexpensive and readily available raw materials, high product selectivity, and broad market prospects.

The invention discloses a method for synchronously dissolving out polyphenol and polysaccharide from diaphragma juglandis based on a composite enzymolysis technology, and belongs to the field of plant active ingredient extraction. Comprising the following steps: degrading lignin by using laccase and a 1-hydroxybenzotriazole system (0.6-1.0 U / g: 5.0 mM, the pH value is 6.8-7.2, and the temperature is 30-34 DEG C); cellulase, xylanase and mannase (0.8-1.2 U / g: 0.4-0.6 U / g: 0.25 U / g, the pH value is 5.3-5.7, and the temperature is 50-60 DEG C) are adopted to thoroughly decompose a cell wall framework, and an arabinogalactose main chain is released; according to the method, tannase, beta-glucosidase and alpha-arabinofuranosidase (0.8-1.2 U / g: 0.6-1.0 U / g: 0.4 U / g, the pH value is 3.9-4.1, and the temperature is 40 DEG C) are adopted to hydrolyze polysaccharide side chains and tannin structures. Embodiments prove that the extraction rates of the polyphenol and the polysaccharide respectively reach 10.20% and 3.25%, so that the problem of single-component extraction limitation caused by incompatibility of extraction conditions of the polyphenol (requiring low-temperature oxygen avoidance) and the polysaccharide (requiring high-temperature dissolution) in the traditional process is successfully solved, and an efficient and environment-friendly solution is provided for high-value utilization of the diaphragma juglandis.

The invention discloses a benzotriazole quaternary ammonium salt ionic liquid corrosion inhibitor and a preparation method and application thereof. The invention comprises the following steps: S1: dissolving 1-hydroxybenzotriazole in N,N-dimethylformamide, adding potassium carbonate and 1,6-dibromoalkane, reacting at room temperature until the reaction of the raw materials is complete as detected by TLC, stopping the reaction, and extracting, separating, and purifying to obtain an intermediate 1; S2: dissolving the intermediate 1 obtained in S1 in a triethylamine solvent, heating to a certain temperature, stirring and reacting until the reaction of the raw materials is complete as detected by TLC, stopping the reaction, and removing excess amine solvent by reduced pressure distillation to obtain the benzotriazole quaternary ammonium salt ionic liquid corrosion inhibitor; the ionic liquid corrosion inhibitor acts on the surface of cold-rolled steel through physical adsorption and chemical adsorption to form a dense protective film, thereby effectively inhibiting corrosion of the cold-rolled steel surface by an acidic medium; and the ionic liquid corrosion inhibitor of the invention has the characteristics of low raw material price, simple synthesis method, mild reaction conditions, environmental friendliness, and excellent corrosion inhibition performance.

The present invention relates to a photovoltaic element, comprising a front layer, a back layer, and a plurality of photovoltaic cells, which photovoltaic cells are present between the front layer and back layer, wherein the front layer consists of a polypropylene composition, comprising: a) a random polypropylene resin; b) a mixture of light stabilizing additives; said mixture comprising: i) a high molecular weight hindered tertiary amine light stabilizer (t-HM-HAL S) having a weight average molecular weight of at least 1600 g / mol; ii) a low molecular weight hindered secondary amine light stabilizer (s-LM-HALS) having a weight average molecular weight of below 1000 g / mol; iii) an ultraviolet synergist, being a n-alkyl-3,5-dialkylated 4-hydroxybenzoate; iv) an ultraviolet absorber, being a hydroxybenzotriazole compound or a hydroxyl benzophenone compound or a mixture thereof; c) a mixture of antioxidant additives; said mixture comprising: i) a phenolic antioxidant; and ii) a phosphite additive. The invention also relates to a polypropylene composition and to the use thereof as front layer.

The invention discloses a preparation method of an anti-oxidation coating, and relates to the technical field of coatings. Hydroxybenzotriazole is firstly used for esterifying modified acrylic acid, then the modified acrylic acid is used for preparing the modified acrylic resin coating, a benzotriazole structure has high hardness and rigidity and also has good ultraviolet absorption performance, the degradation effect of ultraviolet rays on acrylic resin can be reduced, the durability of the coating is further improved, and the service life of the coating is prolonged. The novel microcapsule wall material is prepared by modifying the microcapsule wall material with the hydrophobic compound and then coating the microcapsule wall material with the antioxidant, and the microcapsule wall material modified with the hydrophobic compound can effectively prevent external moisture and oxygen from entering the interior of the microcapsule, so that the stability of the coating in a humid environment is improved; and the coating of the microcapsule protects the core material antioxidant from being influenced by the external environment, the antioxidant is slowly and continuously released in the coating, and the oxidation reaction of the coating is effectively inhibited for a long time. The anti-oxidation coating prepared by the invention has the effects of wear resistance and durability.

The application belongs to the technical field of beer brewing, and particularly relates to a beer silica gel clarifier and a preparation method and application thereof. The preparation method of the beer silica gel clarifier comprises the following steps: preparing a sol: first, adding a hydroxyl protecting agent into a sodium silicate solution; then, adding a raw material sulfuric acid solution into the sodium silicate solution to perform a reaction; when the reaction is performed to 2%-20% of the total reaction time, adding a catalyst; when the reaction is performed to 25%-50% of the total reaction time, adding N-hydroxybenzotriazole; after the reaction is completed, the sol is prepared; preparing a gel: after the obtained sol is aged and alkali-bubbled, the gel is prepared by washing; preparing the beer silica gel clarifier: after the prepared gel is dried and activated, the beer silica gel clarifier is obtained. The preparation method can finely control the pore diameter of the silica gel, and the prepared silica gel clarifier can realize high-selective adsorption of turbidity-sensitive proteins.