75 results about "Diiodomethane" patented technology

A developing roller having a surface layer which contains a urethane resin composed of a reaction product of an isocyanate with a group of specific alcohols and has a surface having a contact angle to ethylene glycol of from 60.0 degrees or more to 90.0 degrees or less and a contact angle to diiodomethane of from 30.0 degrees or more to 38.0 degrees or less. The developing roller is highly reliable as having controlled banding which is an image difficulty caused at the part of contact between the developing roller and a developer feed roller.

The invention relates to a superhydrophobic oleophobic modification method of a porous membrane, and belongs to the technical field of separation membrane. According to the present invention, based on the self-cleaning bionic principle, fluorosilane-modified SiO2 nanoparticles having low surface energy are dispersed in an organic solution to prepare a uniform dispersion liquid, and a porous membrane is subjected to superhydrophobic oleophobic modification by using a dynamic filtration method to prepare the amphiphobic composite membrane having good stability, wherein the water contact angle of the amphiphobic composite membrane surface can achieve 167.3+ / -1 DEG C, the contact angle of diiodomethane can achieve 145.9+ / -1 DEG C, and the good amphiphobic property is presented; and method has characteristics of no requirement of complex equipment, simple and easy-performing process and short preparation period, and the prepared membrane has characteristics of high flux and good pollution resistance.

The invention relates to a super-hydrophobic and super-oleophobic epoxy resin coating and a preparation method thereof. The super-hydrophobic and super-oleophobic epoxy resin coating comprises the following components in parts by weight: 10 parts of fluorinated modified epoxy resin; nano particles accounting for 1-30% of the mass of the fluorinated modified epoxy resin; micron particles accounting for 1-30% of the mass of the fluorinated modified epoxy resin; a curing agent accounting for 5-50% of the mass of the fluorinated modified epoxy resin; a solvent, 3-20ml of the solvent being added into each gram of the fluorinated modified epoxy resin; and a hydrophobic modifier of which the mass is 1-2 times of the addition mass of the nano or micron particles. Compared with the prior art, the water contact angle of the coating is greater than 155 degrees, the contact angles with glycerol and ethylene glycol are greater than 150 degrees, the contact angle with diiodomethane is greater than 135 degrees, the adhesive force of the coating is the optimal level of 0, the coating does not fall off under the adhesion of an adhesive tape, and the coating is a super-hydrophobic and super-oleophobic coating with strong adhesive force and long service life, has excellent friction resistance, acid and alkali resistance and icing resistance, and has a wide application prospect.

A coating film to prevent a conspicuous fingerprint has a water contact angle of no less than 60° so that most of water contained in fingerprints on the coating film evaporates without forming a layer adsorbed on the coating film. Further, the coating film has lipophilicity and has a diiodomethane contact angle of no more than 45° so that the coating film exhibits enhanced affinity to fingerprints, which primarily contain oily components.

The present invention relates to a kind of synthetic method of food spice 1,2,3,5,6-pentathiocycloheptane, the steps are as follows: firstly thiating: in a three-necked reaction flask equipped with a stirrer, a constant pressure dropping funnel, and a thermometer Add sodium tetrathiocarbonate and absolute ethanol to the mixture and stir until sodium tetrathiocarbonate is completely dissolved. Add the absolute ethanol solution of diiodomethane dropwise with a constant pressure dropping funnel within 2 hours at 25°C. Stir and react at a constant temperature of 25°C for 10 hours; second extraction: dilute the above reaction solution with water, then extract three times with cyclohexane, separate the water layer and combine the extracts, add anhydrous calcium chloride for drying; finally obtain the finished product by distillation. The invention provides an edible spice 1,2,3,5,6-pentathiacycloheptane with strong characteristic fragrance, good antibacterial activity and biological activity. The process is simple and the yield is high, and it can be safely used as a spice in It is a new type of mushroom flavor during frying, frying, cooking, frying and other cooking processes.

The invention relates to the technical field of glass detection and especially provides a detection method of surface energy of glass. The detection method includes the following steps: controlling temperature to be 18-22 DEG C and relative humidity to be 40-60%; cleaning a to-be-tested glass surface; selecting any three from diiodomethane, distilled water, formamide, ethylene glycol and glycerol as detection fluids, of which surface energy parameters are known, and measuring equilibration time that the detection fluids are equilibrated on the to-be-tested glass surface; selecting at least three dropping points on the of the to-be-tested glass surface and performing measurement with a contact angle measuring instrument, and calculating the average value of measurement data, which is the equilibration contact angle of the detection fluids on the to-be-tested glass surface; and calculating the surface energy of the glass according to formulas. The method has quick speed, high precision, good stability and low environmental pollution.

The immersion oil has refractive index which is 1.70 or more, and is low autofluorescence. Preferably, the main ingredient is iodine compounds (diiodomethane), and a solid having a high refractive index such as sulfur and the like is dissolved or dispersed into the immersion oil. The production method of the immersion oil has a purification process, in which impurities are removed preferably by adsorbent, distillation or recrystallized. In the method of preservation of the immersion oil, it is always contacted with the adsorbent. The preservation container of the immersion oil contains an adsorbent which is always contacted with the immersion oil.

A semiconductor-wafer-surface-protective adhesive tape having a pressure-sensitive adhesive layer on a substrate film, wherein the thickness of the adhesive layer is 10mum or more, the surface free energy (gammas) of the surface of the adhesive layer is 30-35 mN / m, the contact angle (thetal I) in relation to diiodomethane is 54-60 DEG , the adhesive force in relation to an SUS280 polished surface at 23 DEG C is 0.8-4.3 N / 25mm, and the adhesive force in relation to the SUS280 polished surface when heat-releasing at 50 DEG C in comparison to the adhesive force when releasing at 23 DEG C is 50% or less.

A process for separating zircon from basic rock and purifying it includes such steps as crushing and pulverizing basic rock, magnetic stirring while removing strong magnetic substance by U-shaped magnet, using three magnetic rods to respectively remove weak magnetic, strong electromagnetic and weak electromagnetic minerals, using miniature shaker to remove the most of light mineral, electromagnetically fine separation by multi-purpose magnetic analyzer, using heavy diiodomethane solution for separation in separating funnel to remove light minerals and examine by binocular microscope. Its advantages are high purity (more than 99%) and short period.

The invention discloses a modification method of a microporous polymer with a high nitrogen content, and application of the microporous polymer with the high nitrogen content in gas absorption and catalyst carrier or energy storage. The modification method comprises the following steps: mixing the microporous polymer with the high nitrogen content and potassium carbonate, grinding the mixture, andthen placing the ground mixture in a container; injecting N, N-dimethylformamide, and carrying out microwave oscillation; injecting diiodomethane in a nitrogen atmosphere for carrying out a reaction;washing the reactant, and drying. The modification method provided by the invention adopts a super-crosslinking reaction, the microporous polymer with the high nitrogen content and diiodomethane react in presence of a alkali, so that -NH- imine bonds and C-I bonds are enabled to react with each other, hydrogen iodide is removed, and C-N bonds are generated; the C-N bonds also endow the polymer with excellent redox property; the two C-I bonds in the diiodomethane are similar to a crosslinked scaffold, and can both expand the accumulated chain segments in the polymer and enable the interior ofthe polymer to be subjected to a cross-linking reaction, so that the specific surface area of the polymer is enlarged. The microporous polymer with the high nitrogen content has a better application value in the fields such as gas adsorption, catalyst carrier storage and energy storage.

The invention relates to a method for representation of surface and interface characteristics of azide polyether elastomer. The method includes: a plurality of azide polyether films containing different AP, RDX, HMX and aluminum powder, and a dynamic contact angle process is employed to test the contact angles of the six different reference solutions on the surfaces of the different azide polyether films, the reference solutions including polar reference solutions of water, ethylene glycol and formamide and nonpolar reference solutions of diiodomethane, alpha-bromonaphthalene and cyclohexane;wherein the polar reference solutions and nonpolar reference solutions are grouped in pairs, and calculation is carried out to acquire the surface energy of the azide polyether films, with different packing. In the method, the acquired solid surface energy used for evaluating the packing-substrate surface and interface characteristics of an azide polyether propellant has excellent effect. The method is simple and is high in test precision.

The invention relates to edible spice lenthionine. The lenthionine comprises the following raw materials in part by weight: 18 to 20 parts of sodium tetrathiocarbonate, 18 to 20 parts of diiodomethane, 140 to 160 parts of absolute ethyl alcohol and 90 parts of carbon tetrachloride. The lenthionine (also named 1,2,3,5,6-pentasulfide cycloheptane) prepared by the invention is widely applied to sauce products, meat products, convenient food and seasoning bouillon series, has pure, true and strong flavor, rich meat and good taste, can cover bad peculiar smell and resist to high temperature, is an ideal option for canned mushroom, mushroom sauce, the convenient food and seasoning and has a wide market prospect.

The invention discloses a reverse osmosis flame-retardant waterproof layer. The reverse osmosis flame-retardant waterproof layer comprises 2-5 parts of tetrahydrofuran, 11-16 parts of diiodomethane, 20-30 parts of PVC resin, 10-13 parts of stabilizer, 9-13 parts of propylene carbonate, 3-9 parts of phenylcarbinol, 9-12 parts of dibutyl phthalate, 5-7 parts of dimethylethanolamine, 3-5 parts of anti-foaming agent, 2-7 parts of tetrahydrofuran, 8-12 parts of propenol, 13-18 parts of nitroethane, 9-13 parts of glycol, 15-18 parts of crosslinking agent, 3-7 parts of sodium tetraborate, 4-9 parts of mixed phosphate, 13-18 parts of plasticizer, 11-13 parts of auxiliary material, 22-28 parts of expansive fire-retardant system, 28-33 parts of ATO powder, 11-15 parts of E-20 epoxy resin, 22-25 parts of alcohol-soluble acrylate resin, 18-22 parts of fire retardant, 5-7 parts of thickening agent, 15-18 parts of coalescing agent, 1-3 parts of tetrahydrofuran, 11-13 parts of sodium silicate, 3-7 parts of 2-butoxyethanol, 22-25 parts of wood fiber powder, 28-31 parts of carbon fiber powder, 9-15 parts of coalescing agent, 12-16 parts of barium sulfate, 3-7 parts of lime powder and 11-13 parts of auxiliary material.

The present invention relates to an [18F]fluoromethyl group-introduced radiotracer for positron emission tomography for targeting brain neuroinflammation, a synthesis thereof, and a method for evaluating biological results using the same. In the present invention, a fluoromethyl group-introduced fluorine-18 labeled radiotracer was prepared by introducing [18F]fluoroiodomethane, in which a prosthetic group diiodomethane is labeled with fluorine-18, into PBR28-OH through two stages, or substituting fluorine-18 using a triazolium triflate precursor in one stage at high yield. It was confirmed that, as a result of comparison and evaluation with exiting known [11C]PBR28 in view of in vitro binding affinity, fat affinity, and pharmacodynamic characteristics in a brain neuroinflammation model, the fluoromethyl group-introduced fluorine-18 labeled radiotracer had similar binding affinity and fat affinity to [11C]PBR28. Further, it was confirmed from the PET image comparison and evaluation in the brain neuroinflammation model that the fluoromethyl group-introduced fluorine-18 labeled radiotracer exhibited excellent selective / specific absorption in the inflammatory region more quickly and had high stability at the brain neuroinflammation site. According to the present invention, with respect to the synthesis of the novel fluoromethyl group-introduced fluorine-18 labeled radiotracer for PET targeting brain neuroinflammation and the diagnosis of brain neuroinflammation diseases, fluorine-18 having a relatively longer half-life than [11C]PBR28 was capable of being excellently labeled through the minimum structural change, and its excellent selective and specific imaging and pharmacodynamic advantages were verified, and thus a useful radiotracer for PET targeting brain neuroinflammation can be expected.

The invention belongs to the field of the synthesis of anti-hepatitis C virus medicines by using medical intermediates, and particularly relates to an asymmetric synthesis method of a medical intermediate 2-azabicyclo [3. 1. 0] hexane-2, 3-tert-butyl dicarbonate. The asymmetric synthesis method is mainly characterized in that (2R) or (2S)-1, 2-tert-butyl dicarbonate-2, 3-pyrrole alkene is used as a raw material, methylbenzene, benzene or trihalomethylbenzene is used as a solvent, diiodomethane, chlorobromomethane, dibromomethane or diethylzinc is used as a cyclopropanation reagent, and after reaction, the compound 2-azabicyclo [3. 1. 0] hexane-2, 3-tert-butyl dicarbonate is obtained. The asymmetric synthesis method has the advantages that synthesis steps are simple, the yield is high, the cost is low, the cyclopropanation reagent is wide in selectivity, the synthesis process is simple, convenient and practical, and the like.

The invention discloses a membrane preparation method combining construction of nanoparticles and a membrane surface microstructure, belonging to a preparation method of a surface microstructure membrane. The invention aims to solve the problem of membrane pollution caused by poor hydrophobicity, poor oleophobicity and insufficient durability in existing membrane distillation technology. The membrane preparation method comprises the following steps: 1, preparing a PVDF base membrane casting solution; 2, preparing a membrane for membrane distillation, wherein the surface of the membrane is provided with a regular cylindrical concave array; 3, loading silicon dioxide nanoparticles; and 4, reducing surface energy to form a membrane formed by combined construction of the nanoparticles and the membrane surface microstructure. The maximum values of static contact angles of the membrane, formed by combined construction of the nanoparticles and the membrane surface microstructure, with water and diiodomethane are 170 degrees and 157 degrees respectively, and a super-amphiphobic level is achieved, so the membrane has excellent anti-pollution performance. The invention provides the method for preparing the membrane by combining the nanoparticles with the membranemembrane surface microstructure.

The invention belongs to the field of polymer membrane materials, and discloses a high elastic and high permeable antifouling polyurethane membrane and a preparation method and application thereof. Raw materials of the high elastic and high permeable antifouling polyurethane membrane are prepared from the following effective components in percentage by mass: 30-40% of a hard segment monomer, 40-50% of a soft segment monomer, 3-6% of a hydrophilic monomer, 0-3% of a cross-linked monomer, 0%-5% of a small molecule chain extender, and 10-15% of a low surface energy compound. According to the highelastic and high permeable antifouling polyurethane membrane, through polycondensation reaction, a chemical and physical double cross-linked antifouling polyurethane is synthesized; the membrane shows excellent low adhesion and antifouling properties; water, diiodomethane, cetane and other liquids with different surface tension do not adhere to the membrane at all, and slide off the membrane without leaving traces; and when the membrane is in a tensile state (the elongation is less than or equal to 1800%), the liquids can still slide off the membrane without leaving the traces, and it is shown that the membrane can simultaneously achieve the coexistence of low adhesion and extensibility.

The invention relates to a [<18>F]-fluoromethyl triphenylphosphine salt, a preparation method and application thereof, and effectively solves the problem of low ratio of myocardial uptake and non-target organs in existing myocardial perfusion imaging agents. The method includes: dissolving silver p-toluenesulfonate in acetonitrile, adding diiodomethane under stirring, conducting heating reflux, performing cooling to room temperature, filtering out light yellow solids, removing the solvent by spinning, and eluting and purifying the residue to obtain bis(p-toluenesulfonyl)-methane; under nitrogen protection, adding a [<18>F] fluoride solution into a K2.2.2 solution and a K2CO3 solution, performing drying, adding acetonitrile, conducting drying again, adding bis(p-toluenesulfonyl)methane and anhydrous acetonitrile into the dried substance, carrying out reaction, and performing cooling to room temperature, conducting column chromatography, adding an acetonitrile solution containing triphenyl phosphine to carry out reaction, and then performing cooling, filtering, column purification, solvent removal, normal saline dissolution and filtering, thus obtaining the [<18>F]-fluoromethyl triphenylphosphine salt. The [<18>F]-fluoromethyl triphenylphosphine salt provided by the invention has the characteristics of high cardiac and myocardial uptake, fast clearance rate in main organs, and high heart blood ratio, heart-lung ratio and heart-liver ratio, low cost, and can acquire clear heart Micro-PET images.

The invention belongs to the technical field of optical grade polyester films, and particularly relates to a light weather resistant optical grade PET rigid film. The hardening film is prepared from the raw materials of UV curing resin, a photoinitiator, polytetrafluoroethylene, organosilane, montmorillonoid, n-hexadecane, diiodomethane and cyclohexanone, the hardening film adopts UV curing hardening liquid, thus the hardness of the hardening film is large on the basis of the small thickness, the screen protection ability is high, the polytetrafluoroethylene, the organosilane and the montmorillonoid make surface energy of the hardening film low, thus the hardening film is prevented from being deformed by influence of the low temperature, a silicon oxygen bond in the organosilane has long bond length, large bond angle and easy internal rotation, molecules are helical, methyl groups are arranged outwardly and rotated around the silicon oxygen bond, the surface energy is very low, the good hydrophobic and oleophobic properties are achieved, the surface of the hardening film is not prone to being dirty, and the visual effect of a screen is affected to the low extent while the screen isprotected.

The invention discloses a preparation method of drospirenone, which aims at solving the problems of high production cost, low yield, and poor product quality in the existing preparation method of the drospirenone. The preparation method comprises the steps of: taking 3beta, 5-dyhydroxy-15beta, 16beta-methylene-5beta-androstane-6 alkene-17-ketone as materials, firstly, reacting with diiodomethane and zinc-copper couple, introducing 6beta and 7beta cyclopropane structures, then orderly carrying out condensation reaction and esterification reaction in THF (tetrahydrofuran) solution of lithium metal and 3-methyl bromopropionate and DMF (dimethyl formamide) solution of sodium ethoxide, finally oxidizing by sodium hypochlorite, and dewatering the toluenesulfonic acid to obtain the drospirenone. According to the preparation method, the efficiency is high, the production cost is low, by-products are few, special demands on production equipment do not exist, the reaction condition is mild, the process is stable, the operation is convenient, the environment is prevented from being damaged, and the large-scale industrial production is facilitated. The product obtained by the method is stable in quality, high in yield and purity and free of purification.

Provided is an adhesive tape for protecting a semiconductor wafer surface having bumps, said adhesive tape having an ultraviolet curable adhesive layer on a substrate film, wherein the adhesive layer comprises a (meth)acrylic polymer having a weight average molecular weight of 10,000 to 2,000,000 and a radiation curable carbon-carbon double bond-containing group, a hydroxyl group and a carboxy group; the surface free energy of the adhesive layer surface before ultraviolet irradiation is at least 25.5 mN / m and less than 35 mN / m; the surface of the adhesive layer after having been cured with ultraviolet irradiation has a surface free energy that is at least 5 mN / m higher than that of the surface of the adhesive layer before ultraviolet irradiation and has a small contact angle with respect to diiodomethane; the polymer constituting the adhesive layer surface having a hydroxyl value of 30-100 mg KOH / g; and the polymer constituting the adhesive layer surface has an acid value of 5-65 mg KOH / g. Also provided is a method for processing a semiconductor wafer having bumps.

A laminated film includes a substrate film and layer A provided at least on one side thereof, layer A containing (1) a (poly)caprolactone segment and (2) a urethane bond, wherein a distilled water contact angle on layer A and a diiodomethane contact angle on layer A are 95° or more, but less than 120° and 70° or more, but less than 87°, respectively.

The invention discloses a detecting device of a jewel bearing curvature radius. The detecting device of the jewel bearing curvature radius comprises a base frame, a sensor, a workpiece clamping mechanism, a program-controlled electricity box, and a touch screen, wherein the base frame comprises a panel, a supporting shaft is arranged on the panel, a rear panel is arranged on the upper portion of the supporting shaft, the sensor is arranged on the rear panel, the workpiece clamping mechanism is arranged on the panel, the workpiece clamping mechanism comprises a horizontally-moved table, a workpiece positioning tool is arranged on the top of the horizontally-moved table, a jewel bearing workpiece is arranged on the top of the workpiece positioning tool, and the program-controlled electricity box is arranged on one side of the base frame. A control device, a programmable logic controller (PLC) and a 24V power supply are arranged inside the program-controlled electricity box, and the touch screen is arranged on the top of the program-controlled electricity box. The detecting device of the jewel bearing curvature radius is simple in structure and convenient to use. The detecting efficiency is increased, and harm to human body and pollution to environment from diiodomethane solution are avoided.

The invention discloses a synthesis method of pentacyclic [6.3.1.0<2, 7>.0<3, 5>.0<9,11>] dodecane to solve the problem of low yield. The invention uses dicyclopentadiene and diiodomethane as materials, comprises following steps of: (1) setting a reaction bottle in an ultrasonic reactor, adding and mixing zinc copper alloy, dicyclopentadiene, diiodomethane, iodine and ethers organic solvent; (2) starting the ultrasonic reactor, in which the reaction temperature is 30 DEG C - 50 DEG C, the reaction time is 0.5h-5h; (3) filtering the reaction liquid, removing the catalyst, decompressing the distillation filtering liquid so as to obtain pentacyclic [6.3.1.0<2, 7>.0<3, 5>.0<9, 11>] dodecane. The invention is short in reaction time, high in yield, and is mainly used in synthesis of pentacyclic [6.3.1.0<2, 7>.0<3, 5>.0<9, 11>] dodecane.

The invention discloses a refractive index solution standard substance and a preparation method thereof. Various inorganic substances and organic substances, which meet purity requirements, are taken as raw materials; the coverage range of the refractive index is from 1.33 to 1.72; and the refractive index can be traced back to a refractive index meter with a maximum error ranging from -0.00002 to 0.00002, and also traced back to a refractive index standard block made of a glass material with an uncertain degree of 5*10-6. The preparation method comprises the steps that ethanol, cane sugar, sodium chloride, ethylene glycol, normal heptane, isooctane, cyclohexane, tetrachloroethylene, 1-iodonaphthalene, chloronaphthalene and diiodomethane with refractive indexes meeting the purity requirements are taken as raw materials; and each batch of raw materials are marked with batch numbers in detail, is mixed uniformly at random, then samples in one fifth quantity of the batch of the samples are extracted at random, and a value is defined by a high-accuracy refractive index meter with a measuring error of 2*10-5 at the temperature ranging from 19.8 DEG C to 20.2 DEG C. The refractive index solution standard substance can serve as a quality control product for daily testing in industries such as pharmaceuticals, essence and flavor, food additives and the like, so that high efficiency, reliability and stability of a production process can be guaranteed. The substance can further serve as a standard reference material for testing mechanisms of food, drug, essence and flavor products, and provides an assurance for the quality supervision and inspection of the types of the products.

The invention belongs to the technical field of organic synthesis of sulfur-containing compounds and discloses a thioether compound and a synthetic method and application thereof. The thioether compound is prepared by the following steps: mixing acetone, a disulfide compound, inorganic base and 18-crown ether-6, heating and stirring, reacting under the action of a catalyst of inorganic base in theair atmosphere, concentrating and purifying to prepare the thioether compound. The molecular structural formula of the thioether compound is as shown in the formula (1) in the specification, whereinR1 and R2 are selected from hydrogen atom, alkyl group, alkoxy group, nitro group, amino group, hydroxyl group, halogeno, acyl group, aryl group or heterocyclic group. The use of high-toxicity halohydrocarbon, such as dichloromethane and diiodomethane is avoided by the method. The synthetic method has simple steps, is simple to operate and is feasible, is environmentally-friendly and has high conversion rate under mild conditions. Yield of the product reaches up to 96%. The thioether compound can be applied in the field of preparation of organic synthetic intermediates.

The invention discloses a method for synthesizing a 2 / 6-iodo-purine derivative through visible light induced hydrazine removal-iodination reaction, and belongs to the technical field of medicine synthesis. In an organic solvent, a 2-hydrazino purine derivative or a 6-hydrazino purine derivative and diiodomethane are used as raw materials and react at room temperature under the irradiation of visible light in the presence of a photocatalyst to obtain the 2-iodopurine derivative or the 6-iodopurine derivative. According to the method for converting hydrazino into iodo, heating is not needed, only visible light irradiation is adopted, use of an additional oxidizing agent is avoided, the cost is low, operation is easy, and the safety coefficient is high.

The invention discloses a high-purity grade diiodomethane purifying method used for photovoltaic material used for a photovoltaic material. The method comprises the following steps: 1)an industrial grade diiodomethane raw material is absorbed by passing through an adsorption column equipped with modified 2-acrylamide-2-methul propanesulfonic acid copolymer medium to obtain a filtrate; 2)passing a filtrate through a quartz purification and rectification apparatus, under vacuum condition, removing preceding fraction, collecting a distillation fluid; and 3)filtering and processing the distillation fluid to obtain the high-purity grade diiodomethane used for photovoltaic material. According to the invention, the modified 2-acrylamide-2-methul propanesulfonic acid copolymer medium is employed for column adsorption, and has strong adsorption capability to impurity ions in a solution, and has strong adsorption capability to hydroxy impurity, free iodine, moisture, and metal ions in industrial grade diiodomethane, and impurity can be effectively removed. According to the invention, the purifying process operation is simple, cost is reduced, yield is increased, and the obtained product quality is stable.

The invention discloses a method for preparing diiodomethane by a solid-supported phase transfer catalyst, in which potassium iodide and dichloromethane are used as raw materials, exchange reaction is carried out in the presence of the solid-supported phase transfer catalyst, and target products are collected from reacted organic phases. The content of the diiodomethane obtained in the preparing method disclosed by the invention reaches more than 99%, and the yield reaches more than 80%. Compared with the prior art, the performance of the catalyst is improved by the solid-supported phase transfer catalyst, and the reaction time is shortened; and the solid-supported phase transfer catalyst can be recycled and reused, the production cost is reduced, a product has stable quality and high purity, and the method is suitable for continuous production.

A coating film to prevent a conspicuous fingerprint has a water contact angle of no less than 60° so that most of water contained in fingerprints on the coating film evaporates without forming a layer adsorbed on the coating film. Further, the coating film has lipophilicity and has a diiodomethane contact angle of no more than 45° so that the coating film exhibits enhanced affinity to fingerprints, which primarily contain oily components.