307 results about "Cresol" patented technology

The invention discloses a coating type high-molecular flame-retardant material. The composite material is prepared from the following components: organic silicon modified epoxy resin, a bio-based castor oil derivative, hydroxyapatite, carbon nanofibers, expanded graphite, ammonium polyphosphate, zinc borate, nano silicon dioxide, molybdenum oxide, microencapsulated red phosphorus, magnesium hydroxide, melamine cyanurate, aluminum diethylphosphinate, pentaerythritol, trihydroxymethyl phosphine oxide and a silane coupling agent. The coating is prepared from a titanate coupling agent, stearic acid, polyethylene glycol, 2, 6-butylated hydroxytoluene, triphenyl phosphite, 2, 4-dihydroxybenzophenone, sebacic diester, polytetrafluoroethylene micro powder, a modified polydimethylsiloxane flatting agent, organic montmorillonite, a polyether modified silicon defoaming agent and a solvent. The invention has the beneficial effects of high flame retardant efficiency, environmental friendliness, excellent comprehensive performance and excellent processability.

The invention belongs to the technical field of insulating oil, and provides a slow-release antioxidant as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing octadecyl trimethyl ammonium bromide, 2, 6-butylated hydroxytoluene, tetraethoxysilane, water and ammonia water, and reacting to obtain the antioxidant; and (2) in a protective atmosphere, mixing the antioxidant, ethanol, water and gamma-mercaptopropyltriethoxysilane, and carrying out a reaction so as to obtain the slow-release antioxidant. The slow-release antioxidant suitable for the synthetic ester insulating oil is prepared through a physical coating means and oleophylic modification, has excellent solubility, can effectively inhibit the increase of the acid value of the synthetic ester insulating oil, delays the oxidation process of the synthetic ester insulating oil, and remarkably prolongs the service life of the insulating oil. Meanwhile, through a slow release mechanism, the antioxidant can prolong the antioxidant effect of the antioxidant, improve the antioxidant stability in long-time operation and meet the higher antioxidant requirement of high-performance equipment such as a transformer for the insulating oil.

The invention relates to an insulating material, in particular to a voltage-breakdown-resistant high-insulation EPDM material and application thereof, and the voltage-breakdown-resistant high-insulation EPDM material comprises the following components: modified silicone rubber, 4, 4 '-thiobis (6-tert-butyl o-cresol), a composite filler, a cross-linking agent, 4-isopropoxybenzoic acid and an EPDM matrix; according to the voltage-breakdown-resistant high-insulation EPDM material disclosed by the invention, the comprehensive performance of the material is greatly improved and the application field of the EPDM material is widened through the matching of all the components and the specific dosage ratio of the components. The modified silicone rubber is introduced, the modified silicone rubber is obtained by modifying vinyl-containing perfluoropolyether-b-polysiloxane, in the vinyl-containing perfluoropolyether-b-polysiloxane, a perfluoropolyether chain segment has extremely low surface energy and good chemical stability, and a polysiloxane chain segment endows the vinyl-containing perfluoropolyether-b-polysiloxane with excellent flexibility and electrical insulating property.

The invention belongs to the technical field of organic matter synthesis, and particularly relates to a preparation method of 2-(2 '-hydroxy-3'-methallyl-5 '-methylphenyl) benzotriazole, in particular to a preparation method of cresol triazole trisiloxane. The invention relates to a preparation method of 2-(2 '-hydroxy-3'-methallyl-5 '-methylphenyl) benzotriazole, which comprises the following steps: mixing cresol trozole, methyl allyl chloride, Lewis acid and a first polar organic solvent, and carrying out Friedel-Crafts alkylation reaction to obtain the 2-(2'-hydroxy-3 '-methallyl-5'-methylphenyl) benzotriazole. When the 2-(2 '-hydroxy-3'-methallyl-5 '-methylphenyl) benzotriazole is prepared, the conventional Claisen rearrangement reaction is replaced, and the 2-(2'-hydroxy-3 '-methallyl-5'-methylphenyl) benzotriazole is prepared by adopting the Friedel-Crafts alkylation reaction of cresol trozole, so that the safety risk of process operation is reduced.

A method may comprise (a) inserting an insulin delivery device subcutaneously into a body of a subject, which comprises an amperometric glucose sensor comprising an electrode layer comprising an indicating electrode and underlying a redox-catalytic layer comprising a redox mediator; (b) using said insulin delivery device to deliver an insulin formulation (e.g., comprising a phenol or cresol excipient) subcutaneously to said subject; and (c) using said amperometric glucose sensor to measure a subcutaneous glucose concentration, which comprises using said redox-catalytic layer to allow electron transfer from subcutaneous glucose to said indicating electrode sufficient to cause a response of said amperometric glucose sensor at an applied bias potential of no more than +250 millivolts, wherein (b) and (c) are performed at the same time for at least one hour, while maintaining a sensor sensitivity of at least 50% of an initial sensor sensitivity for up to one hour.

The present invention discloses a lubricating oil additive for a flexible fuel engine, which comprises the following raw materials: overbased calcium alkyl salicylate, overbased sulfurized calcium alkylphenate, 4-pyridine ethylpropylene polymer, alkyl diphenylamine, 2,6-di-tert-butyl a-dimethylamino-p-cresol, and nano boron nitride BNNS. The present invention also discloses a lubricating oil composition for a flexible fuel engine, which comprises the above-mentioned lubricating oil additive for a flexible fuel engine, and further comprises an emulsifier and a base oil. The present invention can solve the key problem that a large amount of water is generated during the work combustion process of a flexible fuel engine, resulting in hydrolysis of dispersants, friction reducers and anti-wear agents in engine oil, damage to the molecular structure and loss of lubricating function. At the same time, it also solves the technical problem of difficult low-temperature cold start of a flexible fuel engine caused by water.

The invention belongs to the technical field of organic synthesis and separation, and particularly relates to a method for synthesizing phenolic resin from 2, 4 / 2, 5-methyl ethyl phenol. The invention provides a method for synthesizing phenolic resin from 2, 4 / 2, 5-methyl-ethyl phenol, which comprises the following steps: adding 2, 4 / 2, 5-methyl-ethyl phenol, aldehydes and a catalyst into a reactor, carrying out an anti-thermal insulation reaction, sampling and analyzing until the content of 2, 5-methyl-ethyl phenol is less than or equal to 0.5% and is qualified, heating, decompressing and dehydrating, steaming out unreacted 2, 4-methyl-ethyl phenol and water, and dehydrating to 100-200 DEG C to obtain linear 2, 5-methyl-ethyl phenolic resin; adding a catalyst into the steamed material, heating to completely react the reacted 2, 5-methyl ethyl phenol (when formaldehyde in the steamed material is insufficient, a small amount of formaldehyde can be supplemented), adding a non-water-soluble solvent for extraction and layering, and treating a water layer in a wastewater treatment workshop; and rectifying the oil layer to obtain 99% 2, 4-methyl ethyl phenol or pesticide intermediate 4-ethyl-2-cresol.

The application discloses a preparation method of a key intermediate of dapagliflozin, and belongs to the technical field of preparation of medical intermediates. The preparation method of the key intermediate of dapagliflozin comprises the following steps: 1, 1-ethoxy-4-methylbenzene is prepared by using p-cresol, sodium hydroxide and diethyl sulfate; 2, (4-ethoxybenzyl) phenyl sulfide is prepared by using 1-ethoxy-4-methylbenzene, thiophenol, a palladium catalyst, an alkali and an oxidant; 3, 1-benzyl-4-ethoxybenzene is prepared by using (4-ethoxybenzyl) phenyl sulfide under a hydrogen atmosphere; 4, 4-ethoxy-2'-chlorobenzhydrol is prepared by carrying out chlorination reaction on 1-benzyl-4-ethoxybenzene; and 5, 5-bromo-2-chloro-4'-ethoxybenzhydrol is prepared by carrying out bromination reaction on 4-ethoxy-2'-chlorobenzhydrol. The yield and purity of 5-bromo-2-chloro-4'-ethoxybenzhydrol prepared by the method are higher, the process is safer, and the production cost is reduced.

The invention relates to the technical field of medical medicines, and discloses a composition for relieving eye strong light burn and a preparation method thereof. The composition is prepared from the following components in percentage by weight: 0.5 to 3 percent of sodium aliphatate, 30 to 50 percent of corn starch, 25 to 45 percent of talcum powder, 1 to 4 percent of cresol, 5 to 15 percent of flos chrysanthemi indici, 0.05 to 0.5 percent of radix scutellariae, 0.01 to 0.1 percent of flos carthami, 0.1 to 1 percent of aqueous solvent and the balance of water. The preparation method comprises the following steps: crushing medicinal materials; preparing a water-phase matrix containing a water-based solvent and sodium aliphatate; performing dry mixing on corn starch, talcum powder and the medicinal material fine powder; and mixing the water phase and the solid phase, adding cresol, homogenizing, adjusting the pH value, and sterilizing to obtain a paste or pasty composition. The composition can effectively relieve ocular surface pain, lacrimation and foreign body sensation caused by strong light burn through cooperation of multiple ways of physical protection, anti-inflammatory repair and oxidation resistance.

The invention provides a preparation method of an easy-to-grind epoxy functional film and a wafer-level chip packaging structure, and relates to the technical field of chip packaging, the easy-to-grind epoxy functional film comprises the following components by mass: 10-15 parts of phenoxy resin, 10-15 parts of o-cresol novolac epoxy resin, 1-4 parts of carboxyl-terminated nitrile rubber, 15-20 parts of a latent curing agent, and 1-3 parts of an accelerator. 50-52 parts of angular silica powder and 2 parts of carbon black; wherein the molecular weight of the phenoxy resin is 30000 to 35000; the phenoxy resin and the o-cresol novolac epoxy resin are used as matrix resin, the angular silica powder is used as the filler, and the carboxyl-terminated nitrile rubber, the latent curing agent and the accelerant are combined, so that the grinding efficiency of the epoxy functional film is improved, the epoxy functional film meets the working requirements of an automatic film sticking machine and a grinding machine, and the production efficiency is improved.

The invention belongs to the field of renewable resource environment-friendly materials, and particularly relates to a method for preparing a high-performance sound insulation material by using solid waste plastics, a synthesis method of the sound insulation material, and an action principle and application of a modified material. According to the present invention, the formula is synergistic, the sound insulation, the mechanical property and the processing property are balanced, the tensile strength is more than 25 MPa, the sound insulation is excellent in the multi-frequency band, the processing is smooth, and the yield is high, which is far better than the specific components of the brand A product of the traditional recycled plastic sound insulation material: the recycled polyethylene (PE) and the polypropylene (PP) are mainly adopted, and the ratio of the recycled polyethylene (PE) to the polypropylene (PP) is about 3: 2. About 10% calcium carbonate is added as a filler to increase the hardness and weight of the material. Meanwhile, a small amount of antioxidant (about 0.5%), such as butylated hydroxytoluene (BHT), is contained and is used for delaying the aging speed of the material.

This invention relates to a method for testing the resistance to phenolic yellowing of carbodiimide anti-hydrolysis agent powder and its application. The testing method includes: (1) grinding the sample to be tested and spreading it evenly in a petri dish; (2) placing 2,6-di-tert-butyl-p-cresol in a petri dish of the same size as in step (1); (3) placing the test reagent in a container; (4) placing the petri dish from step (1), the petri dish from step (2), and the container from step (3) into a sealed container for aging; (5) immediately using a colorimeter to detect the yellowing index of the sample after aging in step (4). The method of this invention can accurately detect powdered or crystalline carbodiimide anti-hydrolysis agents, solving the problem that it is currently impossible to accurately detect the phenolic yellowing resistance of powdered samples.

The invention discloses a method for preparing anisole by taking dimethyl carbonate as a methylation reagent, a ternary concerted catalytic system is created for the first time to break through temperature limitation, phenol is efficiently activated by [BMIM] OH to generate high-activity phenoxy anions through a composite catalytic design of an alkaline ionic liquid / quaternary ammonium salt / nano metal oxide, the quaternary ammonium salt executes phase transfer and reaction path switching, and the anisole is prepared by taking dimethyl carbonate as a methylation reagent. The nano metal oxide has the effects of balance regulation and structural protection, and the conversion rate of phenol is gt according to the mass ratio of phenol to dimethyl carbonate to basic ionic liquid to quaternary ammonium salt compound to nano metal oxide being 94: (99-117): (2.82-7.52): (0.94-4.7): (0.47-3.76); the selectivity of anisole is gt; the method has the advantages that the concentration is 99%, decomposition of DMC and generation of by-products such as o-cresol are inhibited from the source, a self-settling separation-circulation method subverts a catalyst recovery mode, the by-products are directionally inhibited, the separation process is simplified, and the product can reach gt through single washing and reduced pressure distillation; and high-energy-consumption multi-tower rectification for substances with approximate boiling points in the traditional method is omitted, so that the economic benefit is greatly improved.

The invention relates to the field of lubrication of ball screws, in particular to long-life creep-resistant lubricating grease for a high-precision ball screw, which comprises the following components in parts by weight: 65 parts of polyolefin, 5-10 parts of pentaerythritol ester, 5-10 parts of isocyanate, 2-5 parts of amine chain extender, 5 parts of PTFE (polytetrafluoroethylene), 1.0-1.5 parts of diphenylamine, 0.1-0.5 part of 2, 4-diphenyl-1, 3-pentanediol monoisobutyrate, 0.1-0.5 part of antioxidant, 0.1-0.5 part of antioxidant and 0.1-0.5 part of lubricant. The composite material is prepared from the following components in parts by weight: 0.5 to 1 part of 2, 6-butylated hydroxytoluene, 1.5 to 2 parts of molybdenum isocaprylate, 0.5 to 1 part of molybdenum bis (2-ethylhexyl) dithiocarbamate, 1 to 2 parts of zinc dialkyl dithiophosphate, 3 parts of calcium petroleum sulfonate, 1 to 1.5 parts of polyisobutene, 0.2 to 0.5 part of benzotriazole and 0.1 to 0.3 part of polymethacrylate. The isocyanate comprises HDI and IPDI, and the amine chain extender comprises TETA and TEPA. According to the invention, isocyanate and the amine chain extender react to form a polyurea macromolecular chain, and a high-energy hydrogen bond network is formed, so that the lubricating grease has relatively high creep resistance; the anti-creep performance is further enhanced through cooperation with the PTFE particles; meanwhile, through cooperation with diphenylamine, the oxidation resistance is promoted, the consumption is reduced, and the service life of the lubricating grease is longer.

This invention discloses the application of phenolic antioxidants in phosphate ester fire-resistant oil and the phosphate ester fire-resistant oil itself. It belongs to the field of phosphate ester fire-resistant oil technology. The phenolic antioxidant used is 2,6-di-tert-butyl-p-cresol, with an addition dosage of 0.03%–0.1%. The main component of the phosphate ester fire-resistant oil is tris(2,4-methyl)phosphate. Adding this phenolic antioxidant to the phosphate ester fire-resistant oil product can improve its overall performance during operation, enhance the stability of the phosphate ester fire-resistant oil product, and provide a guarantee for the safe operation of generator sets.

The invention discloses a microwave curing-based coating material and a preparation method thereof. The microwave curing-based coating material comprises mixed resin, a microwave absorbing material, cellulose ether, a curing agent, a hyperbranched polymer, an active monomer, polyglycol modified epoxy acrylate, o-cresol glycidyl ether, p-hydroxyanisole, a plasticizer and an accelerant. During preparation, the mixed resin, the hyperbranched polymer, the active monomer, the polyglycol modified epoxy acrylate and the o-cresol glycidyl ether are mixed and stirred, the p-hydroxyanisole, the plasticizer and the accelerant are sequentially added and stirred, the microwave absorbing material and the cellulose ether are added and stirred, and the curing agent is added and stirred. The coating material disclosed by the invention can be quickly cured within dozens of seconds to dozens of seconds based on a microwave condition, has good corrosion resistance and adhesive property, and fundamentally and effectively solves the problem of high shrinkage rate generally existing in the adoption of the existing light-cured resin.

The utility model relates to the technical field of cresol filtering and purifying, and particularly discloses a small cresol purifying device with a two-stage filtering structure, which comprises a processing box, supporting legs are fixedly connected to the bottom surface of the processing box, a first-stage filtering assembly is mounted at the upper part in the processing box, and a second-stage filtering assembly is mounted at the lower part in the processing box. The first-stage filtering assembly is used for primarily screening and purifying cresol raw materials, the first-stage filtering assembly is used for filtering large impurities in the cresol raw materials, the second-stage filtering assembly is installed on the lower portion of the interior of the processing box, and the second-stage filtering assembly is used for secondarily screening and purifying the cresol raw materials screened and purified by the first-stage filtering assembly; the second-stage filtering assembly and the first-stage filtering assembly are matched with each other, so that the cresol filtering and purifying effect is better. By arranging the second-stage filtering assembly, the cresol raw material can be screened once through the first-stage filtering assembly under the action of centrifugal force and then can be subjected to vibration screening through the second-stage filtering assembly, and the filtering and purifying effect of the cresol raw material can be further better.

The invention relates to the technical field of catalytic material synthesis, and discloses a preparation method of a modified tin-titanium-silicon molecular sieve catalyst, which comprises the following steps: S1, mixing a silicon source, a titanium source, a tin source, an alkali source, a template agent, a surfactant and water to obtain a first mixture; s2, performing hydrothermal reaction on the first mixture in the step S1, and washing, drying and roasting an obtained second mixture to obtain tin-titanium-silicon molecular sieve powder; and S3, mixing and contacting the tin-titanium-silicon molecular sieve powder obtained in the step S2 with an organic solution of organosiloxane, and then drying to obtain the modified tin-titanium-silicon molecular sieve catalyst. According to the modified tin-titanium-silicon molecular sieve catalyst provided by the invention, a catalytic activity center is mainly positioned in a molecular sieve pore channel, and when the catalyst is used for catalyzing a reaction for preparing cresol through toluene hydroxylation, effective shape-selective catalysis can be realized, so that the selectivity of o-cresol and p-cresol can be improved, and particularly the selectivity of the o-cresol can be improved.

The invention provides a positive photoresist composition and application thereof, and the positive photoresist composition comprises the following components in percentage by mass: 20-35% of cresol phenolic resin A, 3-15% of cresol phenolic resin B, 5-10% of a photosensitizer, 0.01-2% of an additive and 50-70% of a solvent. The weight-average molecular weight of the cresol phenolic resin A is 15000 to 30000, and the weight-average molecular weight of the cresol phenolic resin B is 5000 to 10000; the main absorption wavelength of the photosensitizer is within the range of 365-436 nm, and the absorption intensity of the photosensitizer is not less than 14 L / g.cm. The photoresist composition can adapt to different processing technologies of a G line, an H line and an I line, and when the film thickness reaches 10-20 microns, the photoresist composition has high chemical resistance and steepness, the side morphology inclination angle is not less than 83 degrees, and the pattern resolution reaches 5-10 microns; and the electroplating tolerance is excellent.

This invention belongs to the field of diesel additive technology, and particularly relates to a diesel cetane number improver and its preparation process, comprising the following steps: mixing isooctyl nitrate, n-hexadecane, n-eicosane, oleic acid, and 2,6-di-tert-butyl-p-cresol to obtain a premix; mixing anhydrous ethanol, glycerol, and an emulsifier, adding the premix, reacting, and drying to obtain microparticles; mixing ethyl acetate, isopropanol, n-butanol, and an emulsifier, adding hexadecyl alcohol and EVA-210 to dissolve, to obtain a film-forming solution; mixing ethyl acetate and isopropanol, adding the microparticles and the film-forming solution, removing ethyl acetate, isopropanol, and n-butanol, adding the solution to liquid paraffin and mixing to obtain the diesel cetane number improver. The diesel cetane number improver prepared by this invention can prevent isooctyl nitrate from directly contacting the external environment, slow down the generation rate of free radicals, effectively improve and stabilize the cetane number of diesel, and maintain the cetane number of diesel at a high level for a longer period of time.

The invention relates to the field of organic chemical synthesis, and discloses a method for preparing homo-2-methyl-4-chloropropionic acid. Comprising the following steps: reacting chiral 2-chloropropionic acid with a liquid caustic soda solution to generate sodium 2-chloropropionate, reacting p-chloro-o-cresol with liquid caustic soda to generate sodium p-chloro-o-cresol, carrying out nucleophilic substitution reaction to generate a precursor of 2-methyl-4-chloropropionic acid, carrying out acidification reaction to generate 2-methyl-4-chloropropionic acid, cooling, crystallizing, purifying, extracting with a solvent and the like. By controlling reaction conditions, such as temperature, pH value, reaction time and the like, a high-yield and high-purity product is ensured, and the optical loss is less than 1.5%. The method is efficient, environmentally friendly and suitable for large-scale industrial production, and high quality and stability of 2-methyl-4-chloropropionic acid can be guaranteed.

The invention discloses a leavening dough growth-promoting lactobacillus strain KUST4216 for shortening food fermentation time and producing p-cresol at high yield and application of the leavening dough growth-promoting lactobacillus strain KUST4216. The strain is classified and named as Levibacillus zyma KUST4216; the preservation number of the strain is GDMCC NO: 65660. The content of p-cresol in fermentation liquor is larger than or equal to 5 mg / kg after acid bamboo shoots are fermented by the strain for 7 days; after the brine is fermented for 4 to 5 days, the content of p-cresol is 15.5 to 22 mg / kg; the content of p-cresol in the fish dices fermented for 5 days is 5-6 mg / kg, the fermentation effect reaches the content of p-cresol obtained after fermentation of an existing natural fermentation method for 1 month, and the fermentation speed is effectively shortened.

The invention discloses a preparation method of a cresol trozole trisiloxane intermediate, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: by taking 2, 6-dibromo-4-methylphenol as a raw material, reacting with 3, 4-dihydropyran under the action of p-toluenesulfonic acid, so as to generate an intermediate 2-(2, 6-dibromo-4-methylphenoxy) pyran; reacting with sodium methoxide under the action of a catalyst to generate an intermediate 2-(2-bromo-4-methyl-6-methoxyphenoxy) pyran; then generating a Grignard reagent, carrying out coupling reaction on the Grignard reagent and 3-bromine-2-methallyl, finally reacting with benzotriazole lithium salt, and carrying out acidolysis deprotection to obtain the cresol trozole trisiloxane intermediate. The raw materials are available in the market, the overall yield is high, and a route reference is provided for synthesis of the compounds.

The invention relates to the technical field of organic synthesis and separation, particularly discloses a method for synthesizing phenolic resin and extracting para-phenol by an acid process, and solves the problem that common commercial mixed phenol cannot be directly used for synthesizing high-quality phenolic resin and cannot be used for extracting para-phenol by two steps of phenolic resin synthesis, para-phenol crude separation and para-phenol refining. The application of the phenolic resin in chemical products is limited; the production cost of synthesizing phenolic resin from phenol is high; and the economic benefit needs to be improved. And meanwhile, high-quality phenol and o-cresol can be produced while the coalified phenol and the mixed phenol which are low in price are used for replacing petrochemical phenol to produce the phenolic resin, so that the method has certain economic benefits.

The application belongs to the technical field of chemical industry, and particularly relates to a mixed cresol separation method, which comprises selective oxidation, filtration, neutralization, secondary filtration and rectification processes in sequence. The selective oxidation comprises: adding mixed cresol, sodium hydroxide, sodium methoxide, a solvent and a catalyst into an oxidation kettle, heating, and introducing oxygen for selective oxidation. In the selective oxidation step, sodium methoxide is added, which can react with water obtained in a salification reaction step (i.e. a reaction step of sodium hydroxide and mixed cresol to generate sodium phenate and water) to generate methanol and sodium hydroxide, thereby promoting the selective oxidation reaction and improving the yield.

The invention discloses a composite catalyst and a preparation method thereof, and a preparation method of 2, 3, 6-tricresol. The structural formula of the composite catalyst disclosed by the invention is Fe3O4-M-g-C3N4, wherein M is Fe2SiO4 and / or Fe2TiO5. The composite catalyst disclosed by the invention has the advantages of high catalytic activity, high catalyst stability, long service life and few byproducts in a reaction for preparing 2, 3, 6-tricresol; the components introduced into the composite catalyst are cheap, easy to obtain and harmless to a human body, the preparation process is safe and environment-friendly, the cost is low, the composite catalyst is safe to use, and the composite catalyst has a good application prospect.

A method may comprise (a) inserting an insulin delivery device subcutaneously into a body of a subject, which comprises an amperometric glucose sensor comprising an electrode layer comprising an indicating electrode and underlying a redox-catalytic layer comprising a redox mediator; (b) using said insulin delivery device to deliver an insulin formulation (e.g., comprising a phenol or cresol excipient) subcutaneously to said subject; and (c) using said amperometric glucose sensor to measure a subcutaneous glucose concentration, which comprises using said redox-catalytic layer to allow electron transfer from subcutaneous glucose to said indicating electrode sufficient to cause a response of said amperometric glucose sensor at an applied bias potential of no more than +250 millivolts, wherein (b) and (c) are performed at the same time for at least one hour, while maintaining a sensor sensitivity of at least 50% of an initial sensor sensitivity for up to one hour.

The application discloses an efficient treatment method of industrial waste salt, comprising the following steps: mixing the industrial waste salt with a certain proportion of functional particles, and performing microwave treatment; wherein the functional particles are composed of first functional particles and second functional particles; the first functional particles are selected from one or more of silicon carbide, diiron trioxide, titanium dioxide and zinc oxide; and the second functional particles are selected from one or more of 2,6-di-tert-butyl-p-cresol, hydroquinone, tert-butyl catechol and copper naphthenate. The functional particles used in the application have multiple functions such as microwave absorption, reaction catalysis, polymerization inhibition and antioxidation, etc. When the functional particles are mixed with the industrial waste salt and subjected to microwave irradiation, the organic and inorganic small molecules can be catalyzed to crack and generate gaseous small molecules, and meanwhile, the organic matters in the industrial waste salt can be prevented from polymerization, so that the increase of the content of organic polymers in the waste salt is avoided.

Disclosed in the present invention is a method for directly preparing a phenol and an aldehyde or a ketone from an alkyl aromatic hydrocarbon as a raw material on the basis of a selective carbon-carbon bond oxidative cleavage reaction. The method is carried out on the basis of the following steps: mixing an alkyl aromatic hydrocarbon as represented by general formula (I) with a photocatalyst, hydrobromic acid, and an organic solvent and enabling the mixture to react under the conditions of oxygen as an oxidant and light irradiation to simultaneously prepare a phenol compound as represented by general formula (II) and a ketone or aldehyde compound as represented by general formula (III). In the present invention, bulk alkyl aromatic hydrocarbons are used as raw materials for reaction to produce phenol, aldehyde, and ketone organic chemical raw materials. Compared with traditional synthesis methods, the present invention has many advantages such as inexpensive and readily available catalysts, mild reaction conditions, simple operation, good selectivity, and high safety, is suitable for large-scale synthesis of phenols, p-cresol, cyclohexanone, etc., and exhibits wide application prospects.

The application provides a high epoxy value p-cresol formaldehyde epoxy resin and a preparation method thereof, and relates to the technical field of polymer material synthesis. The preparation method realizes precise control of a chemical reaction path through a synergistic process of "segmented temperature control polycondensation-gradient base epoxidation-compound phase transfer catalysis-in-situ water removal", which directionally inhibits main side reactions such as epoxy ring opening and phenolic hydroxyl etherification, significantly improves the ring closure efficiency, and finally obtains the p-cresol formaldehyde epoxy resin with the following performances: an epoxy value of 0.50-0.54 eq / 100g (more than 10% higher than that of a traditional process), a hydrolytic chlorine content of less than 0.03%, and a hydrolyzable chlorine content of less than 0.01%, reaching the electronic grade standard. Through the technical scheme, the industry pain points of many side reactions, low epoxy value, high hydrolytic chlorine content, poor product flame retardancy and large raw material consumption of the existing process are effectively solved.