120 results about "Methyl polysiloxane" patented technology

The invention discloses a polysiloxane elastic waterproof coating and a preparation method thereof, and the polysiloxane elastic waterproof coating comprises the following raw materials: 35-60 parts of methyl polysiloxane resin, 8-12 parts of acrylic resin, 15-20 parts of a filler, 2-5 parts of a thickener, 1-3 parts of a dispersant, 1-3 parts of a coalescing agent, 1-2 parts of an antifoaming agent, 1-3 parts of a leveling agent and 10-20 parts of water. The polysiloxane elastic waterproof coating is obtained by mixing and stirring all the raw materials according to a reasonable proportion, and the polysiloxane elastic waterproof coating is obtained after the coating is dried, and the polysiloxane elastic waterproof coating provided by the invention has excellent adhesion performance, waterproof performance, tensile performance and aging resistance; the waterproof paint can be widely applied to waterproofing of metal materials and building industries.

The invention discloses a construction method and an identification method of characteristic chromatograms of a senecio scandens medicinal material as well as decoction pieces, standard decoction and formula granules thereof, and relates to the technical field of traditional Chinese medicine identification. The construction method of the specific chromatogram comprises the following steps: extracting a to-be-detected sample with methanol to obtain a test solution; the method comprises the following steps: dissolving 5-caffeoylquinic acid, chlorogenic acid, caffeic acid, 4-caffeoylquinic acid, rutin, hyperoside, isoquercitrin and 4, 5-dicaffeoylquinic acid with methanol to obtain a reference solution; and a liquid chromatograph is adopted for determination. A chromatographic column of the liquid chromatograph takes phenyl-methyl polysiloxane as a stationary phase, acetonitrile as a mobile phase A and 0.05 vol%-0.3 vol% formic acid aqueous solution as a mobile phase B for gradient elution. The information of the characteristic chromatogram constructed by the method is rich, and the quality of the senecio scandens medicinal material, decoction pieces, standard decoction and formula granules can be quickly and comprehensively reflected.

The invention relates to the technical field of hydrogel materials, and discloses an oxygen-permeable silicon hydrogel material for contact lenses and a preparation method thereof.The preparation method comprises the steps that ethylene glycol diglycidyl ether and bis (2-chloroethyl) amine hydrochloride are subjected to a ring-opening reaction, and an intermediate product 1, 2-propylene glycol is obtained; carrying out substitution and hydrolysis reaction on the polyalkenyl quaternary ammonium salt and diethyl iminodiacetate to obtain an intermediate product 2, and carrying out quaternization reaction on the intermediate product 2 and chloropropene by utilizing a tertiary amine structure contained in the intermediate product 2 to obtain the polyalkenyl quaternary ammonium salt. And finally, carrying out polymerization reaction on the silicon hydrogel, hydroxyethyl methylacrylate, gamma-(methacryloyloxy) propyltrimethoxysilane and vinyl-terminated dimethyl polysiloxane, putting the obtained product into a contact lens half mold for reaction, and demolding to obtain the oxygen-permeable silicon hydrogel material. The hydrogel material prepared in the invention has good hydrophilic effect and oxygen permeation effect, and can be widely applied to contact lenses.

The invention discloses quartz sand for fracturing and a preparation method thereof, and relates to the technical field of quartz sand for fracturing. The quartz sand for fracturing comprises the following raw materials in parts by weight: 50 parts of quartz sand and 5-8 parts of an organic silicon modified epoxy resin coating agent. The preparation method comprises the following steps: carrying out a reaction on PEG800 and 2, 6-toluene diisocyanate to prepare a transparent colloidal solid, carrying out a reaction on the transparent colloidal solid and bisphenol A epoxy resin to prepare an intermediate, and carrying out a reaction on the intermediate and aminopropyl methyl polysiloxane to prepare the organosilicon modified epoxy resin coating agent. The prepared quartz sand for fracturing has high sphericity, low density and high flow conductivity.

Provided are a thermally conductive resin composition and a thermally conductive sheet which have excellent heat resistance and reliability. The thermally conductive resin composition contains an addition reaction type silicone resin, a thermally conductive filler, an alkoxysilane, and a dimethyl polysiloxane having two or more hydroxyl groups at one end of a molecular chain. The thermally conductive sheet includes a cured product of a thermally conductive resin composition containing an addition reaction type silicone resin, a thermally conductive filler, an alkoxysilane, and a dimethyl polysiloxane having two or more hydroxyl groups at one end of a molecular chain.

The invention discloses a new energy battery cell temperature-resistant insulating coating which is prepared from a component A, a component B and a component C. The component A is prepared from, by weight, 20-60 parts of film forming matter, 15-50 parts of temperature-resistant filler, 15-25 parts of flame retardant, 10-15 parts of carrier powder, 1-2 parts of organic silicon additive and 3-5 parts of diluent, the component B is a catalyst, and the component C is a curing agent. The composition of the methyl polysiloxane resin, the epoxy modified polysiloxane resin and the silazane resin is used as a film forming substance, and the battery cell coating with high flame retardant grade and shear resistance can be obtained. The low-melting-point glass powder with the initial melting temperature of 500 DEG C is introduced into a film forming substance, so that the voltage resistance of the coating before high temperature resistance can be improved, the insulation effect of the coating is optimized, and the salt mist resistance, acid and alkali resistance, electrolyte resistance and water resistance are improved.

The present invention relates to the field of catalyst technology, and specifically to a ruthenium-based catalyst with high thermal stability, a preparation method and application thereof. (1) A ruthenium salt, a polyol and a surface protective agent are mixed and reacted to obtain a ruthenium nanoparticle colloid, wherein the polyol includes one of ethylene glycol, propylene glycol and isopropanol, and the surface protective agent includes one of trimethylsiloxane, aminosilane and dimethylpolysiloxane; (2) The ruthenium nanoparticle colloid described in step (1) is mixed with a rare earth oxide, and the ruthenium nanoparticles are loaded onto the rare earth oxide by a colloidal precipitation method to obtain a catalyst precursor; (3) The catalyst precursor is calcined to obtain the ruthenium-based catalyst. The ruthenium-based catalyst prepared by the present invention is applied to an ammonia decomposition reaction, and the reaction temperature is 500°C and 20,000 h. ‑1 Under the space velocity conditions, the catalyst reaction conversion rate can reach 99.5%, and the catalyst reaction activity remains basically unchanged when maintained at 500°C for 20,000 hours.

The invention discloses a method for determining the content of various residual solvents in a clozapine bulk drug by using capillary gas chromatography, and belongs to the technical field of drug analysis. According to the method, a gas chromatographic method is adopted, a capillary chromatographic column with 6% of cyanopropyl phenyl-94% of dimethyl polysiloxane as a stationary liquid is adopted, an FID detector is adopted for detection, and the content of the residual solvent is calculated by peak area according to an external standard method; wherein the multiple residual solvents are methanol, ethanol, isopropanol, n-amyl alcohol, n-butyl alcohol and toluene. The method disclosed by the invention is good in specificity, good in linearity, reliable in accuracy and high in sensitivity; the gas chromatographic method can be used for rapidly, effectively, accurately and reliably separating and detecting the content of various residual solvents in the clozapine raw material medicine, the product quality of the clozapine raw material medicine is improved, and the medication safety of a patient is improved.

Provided is a thermally conductive silicone resin composition that has high thermal conductivity, is relatively resistant to dripping, and has good dischargeability. The composition comprises a matrix resin component (A) and thermally conductive inorganic particles (B), and the matrix resin component (A) comprises 70 to 99 parts by mass of liquid dimethylpolysiloxane (A1) and 1 to 30 parts by mass of a mixed oil (A2) of polydecene and an ethylene-propylene copolymer, per 100 parts by mass of the matrix resin component (A). The liquid dimethylpolysiloxane (A1) has a kinetic viscosity at 40° C. of 50 to 10,000 mm 2 / s, and the mixed oil (A2) has a kinetic viscosity at 40°C of 1 to 1,000 mm 2 / s, and the thermally conductive silicone resin composition contains 400 to 3000 parts by mass of the thermally conductive inorganic particles (B) per 100 parts by mass of the matrix resin component (A).

The invention discloses a detection method for simultaneously determining ethylene glycol and diethylene glycol in cetirizine hydrochloride drops, which comprises the following steps: step 1, setting chromatographic conditions: heating to 220 DEG C at a rate of 20 DEG C / min by using a capillary column with 6% propylphenyl-94% dimethyl polysiloxane as a stationary liquid, and maintaining for 10 minutes; step 2, solution preparation: preparing a blank solvent, a reference solution and a test solution; step 3, determination: taking the blank solvent, the reference substance solution and the test solution for sample introduction analysis, and recording a chromatogram; step 4, limit: calculating by peak area according to an external standard method, wherein the content of ethylene glycol is not more than 0.062%, and the content of diethylene glycol is not more than 0.025%; the method disclosed by the invention is simple, convenient, rapid, high in accuracy and good in specificity, can be used for simultaneously determining the contents of ethylene glycol and diethylene glycol in the cetirizine hydrochloride drops, and is suitable for quality research and control of the cetirizine hydrochloride drops.

The invention relates to the technical field of polyolefin copolymers, in particular to a high-hardness high-internal-density polyethylene propylene butylene copolymer and a preparation method thereof. The problems of low hardness and insufficient cohesion of the copolymer in the prior art are solved. The preparation method comprises the following steps: preparing an alkenyl-terminated dimethyl polysiloxane modified propylene matrix to obtain modified polypropylene; carrying out copolymerization on the modified nano calcium carbonate, 1-butene and 2-butene to obtain modified polybutene; the preparation method comprises the following steps: modifying acrylic acid and acrylamide to obtain modified polyethylene, mixing the components according to a specific ratio, carrying out polymerization reaction under the action of a composite initiator, adding melamine formaldehyde resin for crosslinking, and carrying out extrusion molding and heat treatment to obtain the copolymer. Ethylene, propylene and butylene monomers are modified, and siloxane and nano calcium carbonate are added, so that the cohesive energy of the copolymer is improved; and a three-dimensional cross-linked network is constructed by utilizing the synergistic effect of all the modified components, so that the hardness of the copolymer is improved.

The present invention relates to a surfactant composition capable of making a dimethylsiloxane highly remain the solid surface, which is a surfactant composition containing an anionic surfactant (A), a cationic surfactant (B), and a dimethylpolysiloxane (C), wherein the following molar ratio RA is 0.10 to 0.90; and the following molar ratio Rb is 0.4 or more:RA: a molar ratio {(A) / [(A)+(B)]} of the amount of the anionic surfactant (A) to the total amount of the anionic surfactant (A) and the cationic surfactant (B)Rb: a molar ratio {[(a1)+(b1)] / [(A)+(B)]} of the total amount of a branched-type anionic surfactant (a1) and a branched-type cationic surfactant (b1) to the total amount of the anionic surfactant (A) and the cationic surfactant (B).

The present invention provides: a thermally conductive silicone grease composition which has good viscosity and thermal conductivity, and in which a pump-out phenomenon upon a long period of use thereof is suppressed; and a production method for the same. The present invention comprises a matrix resin and thermally conductive inorganic particles. The matrix resin contains a component (A) and a component (B). The component (A) is an unreactive liquid dimethylpolysiloxane that has a kinematic viscosity of 100 to 10,000 mm2 / s at 25°C. The component (B) is a linear polydimethylsiloxane represented by formula (I) (where Me is methyl, n-Bu is normal butyl, and n = 5 to 1,000). The present invention contains X parts by mass of the component (A) (where X is 50 to 99.9), (100-X) parts by mass of the component (B), and 50 to 3, 000 parts by mass of the thermally conductive inorganic particles. The silicone grease composition is a non-curing product.

The invention discloses a method for detecting related substances of tribromoacetone by gas chromatography, which belongs to the technical field of chemical detection, the related substances of tribromoacetone are detected by gas chromatography, an instrument is a gas chromatograph, a detector is an FID detector, a capillary column taking 100% methylpolysiloxane (MEGA-1) as a stationary liquid is used as a chromatographic column, carrier gas is N2, the flow velocity is 2.0 mL / min, the split ratio is 50: 1, and the detection time is 30 minutes. Temperature programming: the initial temperature is 80 DEG C, and the temperature is raised to 250 DEG C at the rate of 10 DEG C per minute and maintained for 10 minutes; a sample injection mode is as follows: direct sample injection is performed, the temperature of a sample injection port is 260 DEG C, and the temperature of a detector is 280 DEG C; according to the present invention, the sample introduction volume is 0.2 [mu] l, the related substances in the tribromoacetone can be effectively separated, the content of the related substances can be quantitatively detected, the acetone, the bromoacetone, the 1, 3-dibromoacetone and the 1, 1, 3, 3-tetrabromoacetone sequentially appear peaks, and the method has characteristics of simple operation, strong specificity, good repeatability, good intermediate precision and good durability, and can accurately and rapidly determine the content of the various related substances in the tribromoacetone.

The invention relates to the technical field of composite belts, and particularly discloses a battery pack ceramic composite belt and a preparation method thereof. The invention relates to a ceramic composite belt for a battery pack. The ceramic composite belt comprises the following materials in parts by weight: 20 parts of alkyl hydrogen polysiloxane; 36 parts of divinyl terminated dimethyl polysiloxane; 15 to 25 parts of filler; 7.5 parts of silicon dioxide; 10 parts of aluminum hydroxide; 3 parts of a catalyst; 1.5 parts of polyurethane modified acrylic resin; 5 parts of polyhydroxy polysiloxane; other 2 parts; the filler comprises ceramic powder and glass fibers; the preparation method comprises the following steps: S1, preparing a base material; s2, stirring for the first time; s3, carrying out secondary stirring; and S4, preparing a composite belt finished product. The ceramic composite belt can be used in the battery pack, and has the advantages of high strength, excellent high temperature resistance and the like.

The purpose of the present invention is to provide metal oxide particles which have excellent hydrophobicity and are coated with dimethyl polysiloxane. Another object of the present invention is to provide a dispersion, a composition and a cosmetic containing metal oxide particles coated with the dimethyl polysiloxane. Another object of the invention is to provide a method for producing such metal oxide particles coated with dimethyl polysiloxane. The present invention relates to polysiloxane-coated metal oxide particles, the surfaces of which are coated with dimethyl polysiloxane, and the detection rate of hydroxyl groups is 10% or less. The present invention relates to a polysiloxane-coated metal oxide particle, and a method for preparing the polysiloxane-coated metal oxide particle, the method comprising: a surface treatment step of mixing a metal oxide particle with a dimethyl polysiloxane having a kinematic viscosity at 25 DEG C of 500 mm2 / s or more and 4000 mm2 / s or less without using a solvent to coat the surface of the metal oxide particle with the dimethyl polysiloxane; and a step for heat-treating the metal oxide particles coated with dimethyl polysiloxane at 250 DEG C or more and 380 DEG C or less.

The invention relates to the technical field of medical analysis, and particularly provides a method for determining the content of 1, 2-dichloroethane in a residual solvent of 4-cyano-2-methoxybenzaldehyde. The method comprises the following steps: 1) preparing a reference solution and a test solution; 2) setting headspace sampling conditions; 3) setting gas chromatographic analysis conditions, and separating 1, 2-dichloroethane from other impurities by using a capillary chromatographic column of 6% cyanopropyl phenyl-94% dimethyl polysiloxane and a carrier gas of nitrogen by using a heating program; and 3) respectively sucking the reference substance solution and the test solution, injecting into a gas chromatograph, and recording a chromatogram. The method disclosed by the invention can be used for rapidly, effectively, accurately and reliably detecting the content of the residual solvent 1, 2-dichloroethane of the 4-cyano-2-methoxybenzaldehyde so as to meet the requirements of drug quality control.

The present application relates to the technical field of high polymer materials, and particularly relates to a reversible color-changing microcapsule high-temperature-resistant coating and a preparation method thereof, which comprises the following components in mass ratio: inorganic polysiloxane resin 30%-40%, hydroxyl acrylic resin 10%-20%, additive 2%-5%, solvent 5%-15%, white corundum 5%-10%, silicon powder 10%-15%, and reversible color-changing microcapsule pigment 5%-15%; the reversible color-changing microcapsule pigment is synthesized by core material and wall material, and through the synergistic design of organic-inorganic hybrid wall material (methyl polysiloxane prepolymer, acrylic prepolymer and nano silicon dioxide composite) and core material phase change medium (glyceryl stearate), the problems such as insufficient high-temperature resistance of traditional thermochromic coating, slow color-changing response and poor mechanical stability of microcapsules are effectively solved.

This invention belongs to the field of organosilicon thermally conductive materials, and provides a liquid silicone rubber system for thermally conductive pads and its preparation method. The system comprises vinyl-terminated dimethyl polysiloxane, MQ / phenyl-enriched pre-crosslinked polysiloxane microgel, vinyltrimethoxysilane-modified hexagonal boron nitride, alumina, trimethylsilane-terminated dimethylsiloxane-methylhydrosiloxane copolymer, 1,3-divinyl-1,1,3,3-tetramethyldisiloxane zero-valent platinum complex, and 1-ethynyl-1-cyclohexanol, forming a two-component packaging. This system is advantageous in balancing thermal conductivity, electrical insulation, flowability, defoaming, softness and fit, and long-term stability, making it suitable for the preparation of thermally conductive pads.

The invention relates to the field of analytical chemistry, and particularly discloses a method for determining residual solvents N, N-dimethylformamide, dichloromethane, isopropanol, ethyl acetate, methyl tert-butyl ether, ethanol, acetone, tetrahydrofuran and ethylene glycol dimethyl ether in a litamilast raw material by adopting a headspace-gas chromatography method, and a method for determining residual solvents N, N-dimethylformamide, dichloromethane, isopropanol, ethyl acetate, methyl tert-butyl ether, ethanol, acetone, tetrahydrofuran and ethylene glycol dimethyl ether in a litamilast raw material by adopting a headspace-gas chromatography method. The method comprises the following steps of: detecting by using a capillary column with 6 percent of cyanopropyl phenyl-94 percent of dimethyl polysiloxane as a stationary liquid through headspace sample introduction gas chromatography and a flame ionization detector (FID). According to the method disclosed by the invention, nine residual solvents contained in the litamilast raw material can be completely separated in one system, the separation degree is greater than 1.5, the specificity is good, interference from blank solvents and other unknown impurities is avoided, the sensitivity is high, the detection accuracy is high, and the quality of litamilast can be effectively controlled.

The invention discloses a method for determining the residual quantity of petroleum ether in an isonicotinamide benzonate bulk drug by using capillary gas chromatography, and belongs to the technical field of drug analysis. According to the method, an external standard method is adopted for quantification, a 6% cyanopropyl phenyl-94% dimethyl polysiloxane capillary column is used as a chromatographic column, and an FID detector is adopted for detection; the residual quantity of the petroleum ether is the total residual quantity of normal hexane, 2-methylpentane and 3-methylpentane in the petroleum ether. The method disclosed by the invention is good in specificity, good in linearity, reliable in accuracy and high in sensitivity; the gas chromatographic method can be used for rapidly, effectively, accurately and reliably separating and detecting the residual amount of petroleum ether in the isopropylamine bulk drug, and is beneficial to improving the product quality of the isopropylamine bulk drug and improving the medication safety of a patient.

The present invention aims to provide a silicone grease composition that offers excellent workability and oil bleed resistance, high thermal conductivity, and is less likely to scratch the substrate surface. [Solution] A thermally conductive silicone grease composition, (A) A methylpolysiloxane having three alkoxy groups at one end, represented by the following general formula (1), [Formula 1] TIFF2026049379000009.tif2670(in the formula, R 1 (where a is an alkyl group having 1 to 6 carbon atoms, and a is an integer between 10 and 100.) (B) Thermally conductive fillers having a Mohs hardness of 4 or less. A thermally conductive silicone grease composition characterized by comprising the following.

To provide a thermally conductive silicone composition which provides a cured product having low thermal resistance and excellent reliability.SOLUTION: There is provided a thermally conductive silicone composition comprising all of the following components (A) to (F): (A) an organopolysiloxane having at least two alkenyl groups at the ends of the molecular chain and a kinematic viscosity at 25°C of 100 to 500000 mm2 / s, (B) a hydrolyzable methylpolysiloxane having a trifunctional termination at one end represented by the following formula (1) (wherein, R1 is an alkyl group having 1 to 6 carbon atoms and a is a number of 5 to 100), (C) a bismuth-tin-based alloy powder having a melting point of 220°C or less, (D) a thermally conductive filler having a melting point of 280°C or more and an average particle diameter of 3 μm or more other than the component (C), (E) an organohydrogen polysiloxane having at least two hydrogen atoms (Si-H group) directly bonded to silicon atoms in one molecule, (F) a catalyst selected from platinum and a platinum compound.SELECTED DRAWING: None

This application relates to the field of biodegradable materials, and more specifically, to a biodegradable mobile phone screen protector and its preparation method. The screen protector comprises a biodegradable film layer composed of the following raw materials in parts by weight: 100 parts bio-based plastic, 2-5 parts filler, 8-15 parts blend modifier, and 1-3 parts processing aid; the blend modifier is composed of additive A, additive B, methacrylate-terminated dimethyl polysiloxane, acrylate-hydroxypropyl acrylate copolymer, and peroxide; additive A is one or a mixture of poly(2,6-dimethyl-1,4-phenylene ether), cross-linked polyethylene, and polyvinyl butyral; additive B is composed of at least two of water-based rosin, vinylene carbonate, and hydrogenated palm kernel oil, with at least one being water-based rosin. The above scheme yields a biodegradable mobile phone screen protector with superior degradation performance, mechanical properties, and optical properties.

The invention relates to a method for simultaneously determining a pharmaceutical intermediate 1, 3, 5-trimethoxybenzene and related impurities. The determination method comprises the following steps: adopting a gas chromatograph of Agilent Company, and matching a high-precision automatic sampler and a hydrogen flame ionization detector; the chromatographic column is a DB-1 series fused quartz capillary chromatographic column with high temperature resistance and a polyimide coating, the filler is dimethyl polysiloxane, and the specification is as follows: the length is 30m, the inner diameter is 0.53 mm, and the film thickness is 1.0 mu m; the test conditions are as follows: the column flow velocity is 2.0 ml / min, and the split ratio is 10: 1; the temperature of a sample inlet is 280 DEG C, and the temperature of a detector is 300 DEG C; the initial column temperature of a column oven is 130 DEG C, the temperature is increased to 210 DEG C at the speed of 5 DEG C / min and kept for 2 min, and then the temperature is increased to 300 DEG C at the speed of 15 DEG C / min and kept for 6 min; preparing a contrast solution and a sample solution; and performing sample injection detection. The method has the advantages that by adopting the analysis method, the impurity content accuracy is high, the separation effect is good, the accuracy is high, the detection result is stable, and the experimental result can be easily and quickly obtained, so that the impurity distribution is effectively and quickly controlled, and the product quality is improved.

The invention discloses a bionic fish scale composite coating with lubrication and resistance reduction performance and a preparation method thereof, and the method comprises the following steps: (1) mixing deionized water, Tween 80, simethicone and isophorone diisocyanate, and emulsifying in an ice-water bath to form an emulsion; heating, adding ethidene diamine into the emulsion in a nitrogen environment, and carrying out polyurea synthesis reaction to prepare the polyurea microcapsule; (2) uniformly mixing hydroxyl-terminated trifluoropropyl methyl polysiloxane, isophorone diisocyanate, dibutyltin dilaurate and polyurea microcapsules, coating a base material with the mixture, vacuumizing the base material at room temperature until the base material is semi-solidified, then spraying a silicon dioxide acetone solution, continuously curing the base material, immersing the base material into dimethyl silicone oil after the base material is completely cured, and drying the base material to obtain a finished product. The bionic fish scale composite coating with the lubrication and resistance reduction performance is obtained. The prepared composite coating has excellent corrosion resistance and color changing performance. And meanwhile, the composite coating also has good lubricating and resistance-reducing performance, and can be used as a ship resistance-reducing material.

The invention belongs to the field of detection, and particularly relates to a quantitative detection method for benzene in an eltrombopag ethanolamine bulk drug. Comprising the following steps: respectively injecting a test solution and a reference solution into a gas chromatograph by adopting headspace sampling, recording a chromatogram, and carrying out quantitative analysis on the chromatogram by adopting an external standard method; wherein the detection conditions of the chromatography are as follows: a chromatographic column is a capillary column taking 6% of cyanopropyl phenyl-94% of dimethyl polysiloxane as a stationary liquid or a capillary chromatographic column with equivalent efficiency; the column temperature is programmed temperature rise: the initial temperature is 55-65 DEG C, the temperature is maintained for 3 minutes, the temperature is raised to 150 DEG C at the rate of 5 DEG C per minute, then the temperature is raised to 240 DEG C at the rate of 30 DEG C per minute, and the temperature is maintained for 5 minutes; the balance temperature of the headspace bottle is 90-100 DEG C, and the balance time is 20 minutes. The method has the advantages of strong specificity, high sensitivity and high accuracy, and can accurately quantify the benzene content in the preparation process of the eltrombopag ethanolamine bulk drug.

The invention relates to a polymer microsphere sunscreen agent and sunscreen cream prepared from the polymer microsphere sunscreen agent. The microsphere sun-screening agent can be prepared by adopting the following method: firstly, mixing methyl methacrylate, acrylamide methyl benzal camphor, vinyl terminated dimethyl polysiloxane, azodiisobutyronitrile and absolute ethyl alcohol; secondly, carrying out polymerization reaction; and finally, after the reaction is finished, centrifugally separating a reaction solution, alternately washing a centrifugal product with ethanol and water, and drying to obtain the microspheres. After the polymer microsphere sun-screening agent is doped into the prepared sunscreen cream, the sunscreen index of the sunscreen cream can reach about 42, and the sunscreen effect of the sunscreen cream is obvious; the result shows that the polymer microsphere sun-screening agent has good sun-screening performance.

The invention discloses a fracturing fluid assisted carbon dioxide huff and puff oil extraction method, and belongs to the technical field of oil and gas extraction. The fracturing fluid is prepared from the following raw materials in percentage by weight: 0.3 to 0.7 weight percent of silicon-containing tackifier, 0.1 to 0.5 weight percent of fluorine-containing tackifier, 0.8 to 1.2 weight percent of cosolvent, 6 to 23 weight percent of proppant, 0.01 to 0.1 weight percent of gel breaker and the balance of water, the silicon-containing tackifier is one or more of polydimethylsiloxane, polymethylsilsesquioxane, benzyl polysiloxane and methyl silicone oil; the silicon-containing tackifier is one or more of polydimethylsiloxane, polymethylsilsesquioxane, benzyl polysiloxane and methyl silicone oil; the fluorine-containing tackifier is a terpolymer of fluorinated acrylate, a styrene compound and maleic anhydride, and the molecular weight of the fluorine-containing tackifier is 1000 to 1500. The fracturing fluid can be used for tackifying CO2, the sand-carrying capacity of the fracturing fluid is improved, and the oil recovery rate is increased.

The present invention provides a foamable bath tablet containing the following components (A)-(D): (A) 30-50 wt% (inclusive) of (A1) sodium bicarbonate and / or (A2) sodium carbonate; (B) 25-45 wt% (inclusive) of an organic acid; (C) polyethylene glycol having a molecular weight of 1000 or more; 0.1 wt% or more of (D) one or more liquid oily components selected from the group consisting of isopropyl myristate, isopropyl palmitate, and dimethyl polysiloxane, and the weight ratio of the total content of component (C) and component (D) to the total content of component (A) and component (B), [(C) + (D)] / [(A) + (B)], is 0.14 or more. The total content of the liquid components is 0.15% by weight or more and 1.05% by weight or less.