1421 results about "Propanediol" patented technology

An absorbent retail paper product comprised of cellulosic fibers having a concentration of 1, 3-dichloro-2-propanol that is not detected to 50 ppb, as measured using the ACOC official method 2000.0150, a concentration of 3-monochloro-1, 2-propanediol that is not detected to 1000 ppb, as measured using the ACOC official method 2000.0150, as measured by the "adipic acid test", as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150, as measured by the ACOC official method 2000.0150. Polyaminoamide-epihalohydrin at a concentration of not detected to 0.09% has a lateral wet strength of from 80 n / m to 200 n / m wherein all of the cellulosic fibers contained in the absorbent paper product are non-synthetic, the cellulosic fibers and the absorbent paper product are substantially free of formaldehyde.

The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a high-static-rigidity high-damping low-pressure-change polyurethane elastomer and a preparation method thereof. Comprising a polyol component and an isocyanate component, and the polyol component comprises polyol A, a chain extender, a stabilizer, a hydrolysis-resistant agent and a catalyst; the isocyanate component is prepared from isocyanate, polyhydric alcohol B and branched chain unit alcohol; the polyol A comprises amine ether polyol and polytetrahydrofuran ether polyol; the polyhydric alcohol B comprises bio-based hydrolysis-resistant polyhydric alcohol and polytetrahydrofuran ether polyhydric alcohol; the bio-based hydrolysis-resistant polyol is prepared by carrying out a reaction on sebacic acid, 1, 2-propylene glycol and 1, 4-butanediol; the branched-chain unit alcohol is prepared from tetrahydrofuran and isooctanol through a reaction. By introducing the bio-based hydrolysis-resistant polyhydric alcohol and branched chain monohydric alcohol, the damping effect is remarkably enhanced, and on this basis, through formula adjustment and raw material screening, the product toughness is greatly improved, the compression set is reduced, and the performance of the product in heavy haul railway application is effectively optimized.

The invention belongs to the technical field of flame-retardant materials, and particularly relates to a phenylboronic acid-based P / N / B-containing halogen-free flame retardant, a preparation method thereof and application of the phenylboronic acid-based P / N / B-containing halogen-free flame retardant in epoxy resin. The preparation method comprises the following steps: by taking diphenyl hypophosphorous chloride as a basis, preparing a flame-retardant intermediate through nucleophilic substitution reaction between diphenyl hypophosphorous chloride and an aldehyde group-containing phenolic compound, then reacting a phenylboronic acid structure with 3-amino-1, 2-propylene glycol to obtain an amino group-containing phenylboronic acid compound, and finally reacting the phenylboronic acid compound with 3-amino-1, 2-propylene glycol to obtain the amino group-containing phenylboronic acid compound. And finally, carrying out a Schiff base reaction on the flame-retardant intermediate and an amino-containing phenylboronic acid compound to obtain the halogen-free flame retardant containing phosphorus, nitrogen and boron elements. The flame retardant provided by the invention can significantly improve the flame retardant property and mechanical property of epoxy resin. A flame-retardant epoxy resin prepared based on the flame retardant; the influence on Tg of an epoxy resin cured product is small, the smoke suppression and char formation performance and the mechanical performance of the cured product can be remarkably improved, and meanwhile, the flame retardant has excellent flame retardant efficiency; the limit oxygen index of the flame-retardant epoxy resin can reach 31%; the vertical combustion grade is V-0 or above, and the carbon residue amount can reach 18% or above.

The invention belongs to the technical field of oil and gas development, and particularly relates to an oil and gas well blocking remover and a preparation method thereof. The blocking remover comprises the following components: 5-8% of low-carbon composite organic acid, 5-7% of fluoboric acid, 6-9% of ammonium bifluoride, 4-6% of an anti-acid sludge mutual solvent, 2-4% of a corrosion inhibitor, 2-4% of polyoxypropylene polyoxyethylene propylene glycol ether, 8-12% of a permeation dispersion surfactant, 2-5% of a sulfur dissolving agent, 2-5% of a stable chlorine dioxide solution and the balance of water. The preparation method comprises the following steps: adding the low-carbon composite organic acid, the fluoboric acid and the ammonium bifluoride into water and stirring; adding an acid sludge resisting mutual solvent and a sulfur dissolving agent, and stirring; adding the corrosion inhibitor, the polyoxypropylene polyoxyethylene propylene glycol ether and the permeation dispersion surfactant, and stirring; and finally, reducing the stirring speed, adding the stable chlorine dioxide solution, and stirring to uniformly mix. The blocking remover provided by the invention is comprehensive in blocking removal function, very good in dissolving and dispersing performance on complex blocking substances, very small in corrosion damage to a shaft pipe wall and wide in applicability.

The invention discloses a supported nickel catalyst for preparing 1, 3-propylene glycol through hydrogenation of 3-hydroxypropionaldehyde as well as a preparation method and application of the supported nickel catalyst, and relates to the technical field of catalysts. The modified long-chain multi-carbon inducer is used, and a special long-chain molecular structure and a branched chain group of the inducer can effectively and selectively adsorb and occupy a micropore impregnation site; the preparation method has the beneficial effects that more active component nickel species are obviously promoted to be dispersed in main reaction confinement spaces such as mesopores and macropores and interact with the carrier to form effective active sites, and active component steeping liquor is inhibited from entering micropore channels due to capillary action; the active site failure caused by agglomeration of nickel species in micropores in the subsequent drying and roasting process of the catalyst precursor is avoided, the efficient and directional reaction is ensured, the generation of by-products is greatly reduced, the pressure is relieved for the subsequent product rectification separation, and the final product purity is improved. The catalyst provided by the invention can still keep an excellent catalytic effect when the air speed of a 3-hydroxypropionaldehyde solution is increased to 6.5 h <-1 >.

The invention relates to the technical field of pharmaceutical preparations, and provides a minoxidil film coating agent as well as a preparation method and application thereof. The minoxidil film coating agent provided by the invention comprises 40-60% of propylene glycol, 3-7% of polyvinyl alcohol, 20-30% of ethanol, 1-7% of minoxidil and the balance of water. According to the invention, propylene glycol is taken as a solvent, a plasticizer and a transdermal absorption enhancer, polyvinyl alcohol is taken as a film-forming material, and ethanol is taken as a volatile agent, after administration, ethanol is volatilized to promote film formation of polyvinyl alcohol, and propylene glycol enhances the plasticity of the formed film, so that the effect of reducing liquid medicine loss is achieved, the local medicine concentration is increased, and the bioavailability is improved. The minoxidil liniment disclosed by the invention has excellent skin permeability, can effectively convey a medicine to a required part, and can ensure that the medicine is released at a fixed position of the skin and is accurately administered in a medicine release process, so that the stimulation of liquid medicine flow to other parts is reduced, and a good treatment effect is achieved.

The present invention relates to the field of polyurethane materials and particularly to a temperature-induced color-changing vehicle film and a preparation method therefor. The method of the present invention comprises: firstly, using polyurethane to wrap vanadium dioxide powder to obtain color-changing microcapsules; then using 1,1,1,3,5,5,5-heptamethyltrisiloxane and 3-allyloxy-1,2-propanediol as raw materials to synthesize an organosilicon-modified diol, and enabling trimellitic anhydride to react with toluene diisocyanate to synthesize a dicarboximide compound; enabling the organosilicon-modified diol and the dicarboximide compound to undergo an esterification reaction and a polymerization reaction to obtain an organosilicon-modified imide polyester diol; then mixing the organosilicon-modified imide polyester diol with polytetrahydrofuran ether glycol 2000, and then enabling the mixture to react with toluene diisocyanate to obtain a polyurethane elastomer; and mixing the polyurethane elastomer, the color-changing microcapsules, a silane coupling agent, a plasticizer, an antioxidant, and an ultraviolet light absorber, followed by melt extrusion and blow molding into a film, so as to obtain the temperature-induced color-changing vehicle film.

The present invention discloses an infrared-shielding polyurethane glass film and a preparation method thereof, relating to the field of polymer materials technology. When preparing the infrared-shielding polyurethane glass film, the present invention comprises reacting an organic nickel complex and 3-imidazole-1-propionic acid to produce a functionalized crosslinker; sequentially reacting 4-aminophenylacetonitrile with 3-hydroxypropyl acrylate and quinoline-4-carboxaldehyde to produce a UV-absorbing monomer; reacting polypropylene glycol, a UV-absorbing monomer, 1,4-butanediol, and 4-chloromethyl-1,3-phenylenediisocyanate to polymerize to produce polyurethane; reacting tungsten-doped titanium dioxide and chloropropyltriethoxysilane to produce modified titanium dioxide; and uniformly mixing the polyurethane, modified titanium dioxide, the functionalized crosslinker, and acetone, followed by coating and curing to produce the infrared-shielding polyurethane glass film. The infrared-shielding polyurethane glass film prepared by the present invention has excellent infrared shielding, anti-aging, antibacterial, and mechanical properties.

The application discloses a thickened oil viscosity reducer for a main viscosity contribution component of colloid and a preparation method thereof. The thickened oil viscosity reducer comprises the following components in percentage by weight: diethylene glycol methyl ether 25-35%, propylene glycol formate 15-25%, dispersant 5-8%, chelating agent 2-4%, anti-coking agent 0.5-1%, anti-swelling agent 1-2% and corrosion inhibitor 1-2%; and the balance is water. The application is a polar + non-aromatic hydrocarbon solvent system; completely avoids high-risk substances such as nonylphenol polyoxyethylene ether, petroleum sulfonate sodium and organic chlorine; is designed in pertinence and can effectively inhibit metal-induced asphaltene bridging; can withstand working conditions from normal temperature to 250 DEG C and up to 300 DEG C; thermal stability is significantly enhanced, and residual carbon after aging is lower than 8%; viscosity reduction efficiency is higher; the system is more stable, flexible in compounding and suitable for field construction.

The invention discloses a high-temperature-resistant flame-retardant CPVC power cable protection pipe and a preparation method thereof, and relates to the technical field of cable protection pipes. The high-temperature-resistant flame-retardant CPVC power cable protection pipe at least comprises the following raw materials in parts by mass: 100 parts of chlorinated polyvinyl chloride; 15 to 25 parts of high impact resistance type MCS resin; 8 to 12 parts of poly (1, 2-propylene glycol adipate); 12 to 20 parts of a sepiolite-methyl methacrylate-butyl acrylate compound; 8-15 parts of aluminum-titanium composite coupling agent modified magnesium-aluminum-lanthanum hydrotalcite; 3-6 parts of a rare earth composite heat stabilizer; 2-4 parts of a processing aid; 0.5 to 1.5 parts of an antioxidant; and 1-2 parts of a lubricant. The prepared high-temperature-resistant flame-retardant CPVC power cable protection pipe has high heat resistance, high flame retardance and high impact resistance, and is excellent in comprehensive performance, high in safety and reliability and long in service life.

A method for preparing 1,2-propanediol involves reacting propene with hydrogen peroxide in the presence of a catalyst mixture containing a phase transfer catalyst and a heteropolytungstate, in a liquid reaction mixture containing an aqueous phase with a maximum apparent pH of 6 and an organic phase. The process then involves separating the reaction mixture into an aqueous phase (Pa) containing 1,2-propanediol and an organic phase (Po); recycling at least part of the separated organic phase (Po) to the reaction; and recovering 1,2 propanediol from the separated aqueous phase (Pa). In the recovery, 1,2-propanediol is separated from the aqueous phase (Pa) by distillation and the apparent pH of the separated aqueous phase (Pa) is adjusted to at least 9 prior to the distillation to reduce the content of formic acid and acetic acid in the recovered 1,2-propanediol.

The invention discloses a nanoscale high-stability alcohol-in-oil transparent system and a preparation method thereof. The system comprises the following components in percentage by mass: 20-30% of PPG-13-decyl tetradecanol polyether-24, 20-30% of polydimethylsiloxane, 20-30% of polydimethylsiloxane, 20-30% of a 40 to 68% of methyl propylene glycol; 2 to 6% of propylene glycol dibenzoate; and 6-32% of polar grease. The preparation method comprises the following steps: heating and uniformly stirring the propylene glycol dibenzoate and the grease at 55-75 DEG C to obtain an oil phase; adding PPG-13-decyl tetradecyl alcohol polyether-24 into the oil phase, and stirring to obtain a mixed phase; adding methylpropanediol into the mixed phase, and stirring; and cooling to room temperature. The alcohol-in-oil transparent system prepared by a rapid and convenient process has the characteristics of small particle size and high stability, can load tetrahydrocurcumin and other active matters, and has important application value in the field of cosmetics.

The invention discloses fluticasone propionate emulsifiable paste and a preparation method thereof. The preparation method of the fluticasone propionate emulsifiable paste comprises the following steps: S1, mixing liquid paraffin, isopropyl myristate and other auxiliaries, and heating to obtain an oil phase; s2, purified water, propylene glycol, disodium hydrogen phosphate dodecahydrate and other auxiliaries are mixed to obtain a water phase; and S3, adding the oil phase into the water phase, adding fluticasone propionate and the like after complete emulsification, uniformly stirring, and standing to obtain the cream. Compared with the prior art, the fluticasone propionate emulsifiable paste prepared by the invention is not easy to layer at high and low temperatures, and the obtained emulsifiable paste has better stability and is very beneficial to transportation, storage and the like of the product.

The invention provides a high-efficiency foam dedusting agent as well as a preparation method and application thereof. The preparation method of the agent comprises the following steps: (1) mixing and dissolving a surfactant and deionized water according to a certain proportion to obtain a mixed solution A; (2) adding glycerol and propylene glycol into the mixed solution A according to a certain proportion to obtain a mixed solution B, then transferring the mixed solution B into a reaction container, and stirring until all components in the solution are completely and uniformly mixed to obtain a main component C of the foam dedusting agent; and (3) adding sodium dodecyl benzene sulfonate, diethylene glycol monobutyl ether and polyoxyethyl alkyl ether into the main component C according to a certain proportion, and completely dissolving to obtain the efficient foam dedusting agent. The problems of high cost, unstable performance, insufficient foaming amount, short maintenance time, poor anti-freezing performance and the like of a traditional dust removal agent in coal yard dust control are effectively solved by utilizing the synergistic effect of a plurality of auxiliary agents for foaming of the surfactant.

The invention discloses a hyperbranched flame retardant as well as a preparation method and application thereof. The flame retardant is prepared by the following steps: dehydrating and pre-polymerizing a boron-containing component (such as tetrahydroxy diborane) and dihydric alcohol (such as 1, 3-propylene glycol), and condensing with trihydroxymethyl phosphine oxide. 4 parts of the flame retardant is added into epoxy resin, phosphorus-containing free radicals can be released in a gas phase for quenching and smoke suppression, a compact boron-containing expanded carbon layer is formed in a condensed phase, and synergistic flame retardance is achieved. The hyperbranched structure can be embedded into an epoxy network, synchronous reinforcement and toughening are achieved, the impact strength is improved by 123.5%, and the tensile strength is improved by 47.7%. The flame retardant has efficient flame retardance (the limit oxygen index is 33.9%, UL-94V-0 level), high transparency and excellent mechanical properties, and is suitable for epoxy resin composite materials in the fields of electronic packaging, aerospace and the like.

According to the method, industrial-grade 1, 2-propylene glycol co-produced by a dimethyl carbonate process through a transesterification method is taken as a raw material, and purification processes of activated carbon adsorption impurity removal, deodorant impurity removal and rectification impurity removal are carried out, so that various indexes such as chromaticity, odor, purity and ultraviolet light transmittance of the obtained 1, 2-propylene glycol product reach the quality indexes of an imported pharmaceutical-grade 1, 2-propylene glycol product. According to the method disclosed by the invention, the pharmaceutical grade propylene glycol can be prepared with high quality, and a good development prospect and huge economic benefits are undoubtedly brought to the propylene glycol industry.

The present application relates to the field of cosmetic technology, in particular to a quick-drying and shaping spray and a preparation method thereof, in particular to a hair styling product which is quickly dried, permanently shaped and has hair care effect through the synergistic effect of specific film-forming agents and volatile systems, comprising the following components: ethanol 30-50%, aminomethyl propanol 0.1-1%, butanediol 1-5%, octyl acrylamide / acrylate / methyl acrylate copolymer 5-15%, PEG-12 dimethicone 0.5-2%, keratin 0.1-2%, hydrolyzed keratin 0.1-2%, oxidized keratin 0.1-2%, aloe barbadensis leaf extract 0.5-3%, selaginella kurata extract 0.5-3%, radix falatoniae extract 0.5-3%, radix salviae miltiorrhizae extract 0.5-3%, water 20-40%, essence 0.1-2%, cetrimonium chloride 0.1-1%, phenoxyethanol 0.5-1.5%, propylene glycol 1-5%, p-hydroxyacetophenone 0.5-1.5%, chlorphenesin 0.1-0.5%, ethylhexylglycerin 0.5-1.5%.

The invention relates to a liquid detergent composition comprising a first surfactant selected from fatty alcohol ether sulfates, a second surfactant selected from betaines, optionally at least one solvent selected from ethanol, propanol, isopropanol, ethylene glycol, butyl glycol, propylene glycol, polypropylene glycol, alcoholamine, monoethanolamine, glycerol and mixtures thereof, wherein the salt concentration in the composition is about 0.2 to about 10 wt.-% and wherein the salt is selected from the group consisting of sodium salts such as sodium chloride, sodium sulfate, sodium formate, sodium acetate or sodium propionate, potassium salts such as potassium chloride, potassium sulfate, potassium formate, potassium acetate or potassium propionate, magnesium salts such as magnesium chloride, magnesium sulfate, magnesium formate, magnesium acetate or magnesium propionate, and calcium salts such as calcium chloride, calcium sulfate, calcium formate, calcium acetate or calcium propionate, and mixtures thereof, and wherein the composition is a concentrate that can be diluted with water while maintaining or increasing the viscosity.The present invention further relates to the use of such a cleaning composition for cleaning hard surfaces, in particular dishes, and to a process for preparing a cleaning composition, the process comprising diluting the concentrated liquid cleaning composition with water.

The invention discloses a preparation method of bio-based diamide bicyclic carbonate and amide type non-isocyanate polyurethane, and belongs to the technical field of polyurethane. The method comprises the following steps: firstly, reacting bio-based dibasic acid or ester with 3-amino-1, 2-propylene glycol to obtain diamidotetrol, and then reacting with carbonic acid diester in the presence of a catalyst and a phase transfer agent to synthesize bio-based diamide bicyclic carbonate; further, dimethyl itaconate and aliphatic diamine are subjected to condensation polymerization to synthesize amino-terminated itaconic acid polyamide, the amino-terminated itaconic acid polyamide reacts with diamide bicyclic carbonate under the conditions of no catalyst and no solvent, and amide type bio-based non-isocyanate polyurethane is synthesized. The method is based on the bio-based dibasic acid, the diamine and the glycerol derivative 3-aminopropanediol which are rich in source and low in price, the preparation process is green and environment-friendly, the operation is simple and convenient, and the prepared amide type non-isocyanate polyurethane is excellent in mechanical property.

The invention relates to the technical field of chemical detection, in particular to a sample pretreatment method and a GC-MS (Gas Chromatography-Mass Spectrometer) method for simultaneously detecting glycidol and monochloropropanol in heated cigarette aerosol. The sample pretreatment method for simultaneously detecting the glycidol and the monochloropropanol in the heated cigarette aerosol comprises the following steps: capturing particulate matters in the heated cigarette aerosol; mixing the trapping material with ethyl acetate and an internal standard substance, extracting to obtain an extracting solution, and diluting with n-hexane; adding heptafluorobutyrylimidazole to perform derivatization reaction, washing with water after the derivatization reaction is completed, and drying to obtain a solution to be detected. According to the present invention, ethyl acetate is adopted for extraction, and detection analysis can be performed through dilution, HFBI derivatization, water washing and drying, such that the sample pretreatment step is substantially simplified, and the analysis sensitivity and the accuracy of the simultaneous detection of the three compounds such as the glycidyl, the 3-chloro-1, 2-propylene glycol and the 2-chloro-1, 2-propylene glycol can be easily improved.

The present application relates to a kind of powder coating hydroxyalkylamide matting curing agent and its preparation method, the matting curing agent using including citric acid, 2-methyl-1,3-propanediol, dimethylbenzene, anhydrous methanol, N-methyl monoethanolamine, catalyst, nanometer titanium dioxide is reacted to obtain raw materials.In first, citric acid and 2-methyl-1,3-propanediol are grafted to carry out reaction, then the remaining four carboxyl groups of grafting are methyl esterification reaction, obtain methyl esterification product, then with N-methyl monoethanolamine acylation reaction obtains hydroxyalkylamide curing agent;Add nanometer titanium dioxide, fully mix and process to obtain the matting curing agent.The curing agent product functionality is higher, the hardness of coating film after curing is higher, and the boiling water resistance is excellent;And the coating film after curing has obvious matting effect, coating film gloss is basically reached 50-70%, and the decorative property is excellent.

A method for preparing 1,2-propanediol involves continuously reacting propene with hydrogen peroxide in the presence of a catalyst mixture, containing a quaternary ammonium salt and a polytungstophosphate, in a liquid reaction mixture containing an aqueous phase with a maximum apparent pH of 6 and an organic phase containing an alkylaromatic hydrocarbon solvent. The method then involves withdrawing the liquid reaction mixture from the reaction and adding a water-soluble sulfate salt or sulfuric acid to provide a mixture containing from 500 to 10,000 mg / kg of sulfate ions in the aqueous phase. The method further involves separating the mixture obtained into an aqueous phase (Pa) containing 1,2-propanediol and an organic phase (Po), recycling at least a part of the organic phase (Po) to the reaction, and recovering 1,2-propanediol from the aqueous phase (Pa). The method allows for extended operation of the reaction with little loss of tungsten and phase transfer catalyst.

This invention belongs to the field of natural product extraction technology, specifically relating to a method for extracting total polyphenolic active substances from Gastrodia elata in food and cosmetics. The method uses a eutectic solvent as the extraction solvent, combined with ultrasonic extraction. The hydrogen bond acceptors of the eutectic solvent include polyethylene glycol-200, polyethylene glycol-400, and Tween 80, while the hydrogen bond donors include ethylene glycol, 1,2-propanediol, glucose, glycerol, and xylitol. This invention, using a eutectic solvent combined with ultrasonic extraction, achieves high extraction efficiency of total polyphenolic substances from Gastrodia elata, reaching a maximum of 33.2 mg / g. The extraction method of this invention is simple, has a short extraction time, and is practical, showing great development potential in the fields of medicine, food, and cosmetics.

The invention discloses a novel compound rapid surface anesthetic and a preparation method thereof, and belongs to the field of pharmaceutical preparations. According to the anesthetic, core anesthetic components of lidocaine and tetracaine are compounded with propylene glycol-laurocapram synergistic penetration enhancer, menthol auxiliary penetration enhancer, carbomer 980 gel matrix, triethanolamine pH regulator, glycerol humectant, panthenol soothing agent, purified water and the like, a surface smearing agent is prepared through a specific process, and the anesthetic can be administered in combination with an iontophoresis technology. Compared with the existing surface anesthetic for the cosmetic surgery, the surface anesthetic disclosed by the invention solves the problems of slow effect taking and poor effect, can realize rapid penetration of local skin, has short anesthesia effect taking time, long duration and good effect, has no obvious irritation to the skin, has good product stability, can effectively reduce the drug toxicity, and has a good application prospect. The device is suitable for surface anesthesia of non-surgical medical beauty items such as skin beauty, laser treatment and water-light micro-needles.

The invention discloses a method for preparing 1, 3-propylene glycol by hydrating and hydrogenating acrolein, which comprises the following steps: carrying out hydration reaction by taking an acrolein aqueous solution as a raw material and taking acylated and aminated modified polystyrene resin as a catalyst; carrying out flash evaporation or gas stripping on the product after the reaction to remove acrolein, condensing and recovering the removed acrolein, and carrying out hydrogenation reaction on the acrolein-removed mixed solution serving as a hydrogenation raw material on a metal catalyst; and after the reaction is finished, performing flash evaporation on the product to remove water and light components, and performing vacuum rectification to obtain a high-purity 1, 3-propylene glycol product. According to the method, the modified resin is used for catalyzing the acrolein hydration reaction, the overall yield of the 1, 3-propylene glycol can be increased, the catalyst modification process is simple, the cost is low, the additional value of the final product is high, and the method is suitable for industrial production.

The invention belongs to the technical field of chemical component detection, and particularly relates to a method for detecting residues of 1, 3-dichloro-2-propanol, 2, 3-dichloro-1-propanol and 3-chloro-1, 2-propylene glycol in dihydroxypropyl theophylline. The detection method comprises the following steps: (1) adding a solvent into diprophylline for dilution, and uniformly shaking to prepare a test solution; (2) detecting the liquid to be detected by adopting a gas chromatography-tandem mass spectrometry method, and calculating the content of 1, 3-dichloro-2-propanol, the content of 2, 3-dichloro-1-propanol and the content of 3-chloro-1, 2-propylene glycol in the diprophylline according to an external standard method; the solvent is a mixture of formic acid and DMF (Dimethyl Formamide). The method provided by the invention is good in specificity, high in sensitivity, good in repeatability and high in accuracy, and can be used for simultaneously detecting 1, 3-dichloro-2-propanol, 2, 3-dichloro-1-propanol and 3-chloro-1, 2-propylene glycol in the diprophylline.

The invention belongs to the field of chemical engineering, and relates to a process device and method for continuously synthesizing glycidyl (3-chloro-1, 2-propylene glycol and sodium hydroxide (hereinafter referred to as NaOH) as raw materials). The device comprises a raw material feeding pump, a heat exchanger, a micro-reactor, a delay tube reactor 1, a neutralization micro-reactor and a delay tube reactor 2 which are sequentially in fluid communication through pipelines, the heat exchangers are divided into two groups, one group is used for heat exchange of 3-chloro-1, 2-propylene glycol solution, and the other group is used for heat exchange of alkaline solution. According to the method, a 3-chloro-1, 2-propylene glycol solution and a sodium hydroxide solution (NaOH) are adopted as raw materials, glycidol is continuously prepared through a microchannel reactor, on the basis, an acid-base neutralization reaction can be carried out in situ according to needs to remove redundant alkali, redundant heat generated by the acid-base neutralization reaction is absorbed through a low-temperature material, and energy consumption is reduced; the product is analyzed by gas chromatography, and the generated glycidol does not have hydrolysates or auto-polymerization products, so that the product selectivity is higher.

The application relates to the technical field of ink solvents, and particularly discloses an environmentally-friendly water-based ink solvent with high drying efficiency and a preparation method thereof, the environmentally-friendly water-based ink solvent with high drying efficiency comprises the following raw materials in parts by weight: 40-60 parts of water, 30-50 parts of a bio-based alcohol compound, 5-15 parts of n-propyl acetate, 0.3-1 part of tripropylene glycol n-butyl ether, 1-3 parts of nano-cellulose, 0.5-1 part of calcium chloride, 1-2 parts of a pH regulator and 0.2-0.4 parts of a chelating agent. The environmentally-friendly water-based ink solvent with high drying efficiency and the preparation method thereof can be used for ink printing, and have the advantages of high drying efficiency and good stability.

The invention relates to the technical field of fire extinguishing agents, and particularly discloses a lithium battery fire extinguishing agent and a preparation method thereof. The degradable surfactant is selected from at least one of alkyl glycoside and fatty acid methyl ester sulfonate; the particle size of the nanoscale silicon dioxide particles is 10 to 100 nm; the composite flame retardant is formed by compounding an organic phosphorus compound and graphene oxide according to a mass ratio of 1: (0.5-2); the antifreeze agent is selected from at least one of ethylene glycol and propylene glycol; the thickening agent is selected from at least one of xanthan gum and sodium carboxymethyl cellulose; the preservative is selected from at least one of sodium benzoate and potassium sorbate; through the synergistic effect of the composite flame retardant, the fire extinguishing efficiency is remarkably improved, reburning is inhibited, in addition, nano silicon dioxide is uniformly dispersed after being subjected to surface modification to form a compact heat insulation layer, the degradable surfactant and the environment-friendly preservative are combined, and the agent is free of toxic residues.

The invention discloses an infrared shielding polyurethane glass film and a preparation method thereof, and relates to the technical field of high polymer materials. When the infrared shielding polyurethane glass film is prepared, an organic nickel complex and 3-imidazole-1-propionic acid react to prepare a functional cross-linking agent; the preparation method comprises the following steps: reacting 4-aminophenylacetonitrile with 3-hydroxypropyl acrylate and quinoline-4-formaldehyde in sequence to prepare an ultraviolet absorption monomer; the preparation method comprises the following steps: carrying out reaction polymerization on polypropylene glycol, an ultraviolet absorption monomer, 1, 4-butanediol and 4-chloromethyl-1, 3-phenyl diisocyanate to prepare polyurethane; the tungsten-doped titanium dioxide and chloropropyltriethoxysilane are subjected to a reaction, and modified titanium dioxide is prepared; uniformly mixing polyurethane, modified titanium dioxide, a functional cross-linking agent and acetone, and coating and curing to obtain the infrared shielding polyurethane glass film. The infrared shielding polyurethane glass film prepared by the invention has excellent infrared shielding, anti-aging, antibacterial and mechanical properties.