33 results about "Dodecanedioic acid" patented technology

The invention relates to the technical field of epoxy resin, in particular to self-repairing epoxy resin and a preparation method thereof. The self-repairing epoxy resin is prepared from the following raw materials in parts by mass: 80 to 120 parts of bisphenol A type epoxy resin, 20 to 40 parts of bisphenol F type epoxy resin, 5 to 15 parts of 1, 6-hexanediol diglycidyl ether, 1 to 3 parts of 3, 5-dimethylphenylboronic acid, 1 to 5 parts of furyl maleimide, 10 to 20 parts of dodecanedioic acid, 5 to 15 parts of butanetetracarboxylic acid, 1 to 3 parts of catalyst, 10 to 15 parts of nano silicon dioxide, 1 to 2 parts of boron nitride nanosheet and 1 to 2 parts of hyperbranched polyamidoamine. The curing agent is prepared from the following components in parts by weight: 20-30 parts of epoxy resin, 1-2 parts of sulfydryl-terminated polysiloxane, 20-30 parts of amine curing agent, 5-15 parts of reinforcing filler and 0.5 According to the invention, the balance among self-repairing capability, mechanical property and heat resistance is successfully realized; in the microcrack propagation process, fracture and recombination mechanisms of dynamic covalent bonds effectively prevent further propagation of cracks.

The invention provides polyester resin for a self-dusting and high-hardness powder coating as well as a preparation method and application of the polyester resin, and belongs to the technical field of powder coatings. The polyester resin is obtained by mainly polymerizing trimesic acid, N, N-bis (3-aminopropyl) methylamine, 1, 6-hexamethylenediamine, dodecanedioic acid, 2, 5-dimethyl-2, 5-hexanediol, 1, 3-malonic acid, sebacic acid, triethylene glycol, 2, 3-naphthalene dicarboxylic anhydride and the like which are used as main raw materials, and polyester resin 1 and polyester resin 2 which are greatly different in characteristic are respectively prepared by adopting a double-kettle combination mode. And then mixing at high temperature. Good matting and self-frosting effects can be achieved without adding a sand texture agent, and the hardness of a coating film is high.

The invention belongs to the technical field of high polymer materials, and particularly relates to reactive low-viscosity flexible polyester which is used as an epoxy resin toughening agent and contains an organic silicon short-chain branch and a preparation method of the reactive low-viscosity flexible polyester. Y-type organic silicon dihydric alcohol is introduced into a polycondensation reaction system of dodecanedioic acid, azelaic acid and flexible dihydric alcohol, and meanwhile, an epoxy compound is adopted for blocking, so that the reactive low-viscosity flexible polyester containing the organic silicon short-chain branch and used as the epoxy resin toughening agent is prepared. When the reactive low-viscosity flexible polyester is used as an epoxy resin toughening agent, the impact strength, tensile strength and hydrophobicity of matrix epoxy resin for a composite material can be effectively improved, the transparency of a cured product is kept, and the corrosion resistance and weather resistance of epoxy resin anticorrosive paint can also be effectively improved.

The invention discloses a high-lubricity cutting fluid and a preparation method thereof in the technical field of metal processing lubricants, and the cutting fluid is based on deionized water and comprises triethanolamine, an antirust agent, dodecanedioic acid, polyether and a defoaming agent. And two key inorganic modified additives: surface amino functionalized fluorinated hexagonal boron nitride and zinc ion intercalation modified graphite phase carbon nitride. The preparation method comprises the following steps: firstly preparing a premixed solution containing water, triethanolamine, the antirust agent, dodecanedioic acid and polyether, then adding the two inorganic modified additives, performing ultrasonic treatment and uniform dispersion, and finally adding the defoaming agent and filtering to obtain a finished product. Through the synergistic effect of two uniquely designed inorganic compounds, the cutting fluid has excellent lubricity, long-acting antibacterial property and broad-spectrum corrosion inhibition at the same time, is especially suitable for precise and high-speed processing of various materials, and is environment-friendly and easy to process.

The invention provides an environment-friendly wind power gear oil composition and a preparation method thereof, and relates to the technical field of high-performance lubricants, the environment-friendly wind power gear oil composition comprises the following components by mass: 85%-95% of synthetic ester base oil, 1.5%-2.5% of a composite extreme pressure anti-wear agent, 0.5%-5% of an anti-foaming agent, 0.5%-5% of a demulsifier, and 0.1%-1% of an environment-friendly antioxidant; wherein the synthetic ester type base oil comprises a mixture of pentaerythritol ester and diester, the composite extreme pressure anti-wear agent comprises a composition of sulfurized isobutylene, molybdate and boric acid ester, and the diester is obtained through a reaction of dimethyl dodecanedioic acid and C8-C10 Guerbet alcohol. The wind power gear oil composition disclosed by the invention is good in environmental protection performance, excellent in wear resistance and relatively good in oxidation stability, the biodegradation rate is greater than or equal to 90%, the physical and chemical stability is improved, and the effects of functional additives are fully exerted.

The application discloses a modified mixed solution suitable for cement construction waste material regeneration, a cement construction waste material regeneration product and a preparation method thereof, and belongs to the technical field of solid waste utilization. The modified mixed solution for regeneration in the application comprises the following components in parts by weight: 5-8 parts of dodecanedioic acid solution and 15-20 parts of Lewis acid catalyst solution. Through the synergistic effect of "chemical grafting modification-catalytic strengthening bonding-physical compaction forming", the regenerated product with high compactness and excellent compressive strength can be prepared without additional traditional cementing materials such as cement and lime.

The invention discloses a cleaning agent for cleaning a nickel-plated battery shell and a preparation method of the cleaning agent, and belongs to the technical field of cleaning agents. The cleaning agent is prepared by compounding 30-80 parts by mass of a hydrocarbon solvent, 10-30 parts by mass of an alcohol ether solvent, 2-10 parts by mass of a surfactant, 1-5 parts by mass of a penetrant and 0.2-3 parts by mass of a self-made auxiliary agent. Wherein the self-made auxiliary agent is prepared from isooctyl alcohol, cyclohexanol, triethanolamine, dodecanedioic acid and dipropylene glycol butyl ether according to a specific proportion and a reaction process, and organic amine salt with surface activity and a corrosion inhibition function is generated in a system. The cleaning agent can synchronously and efficiently remove polar and non-polar pollutants on the surface of a nickel-plated battery shell through the synergistic effect of all the components, and can deeply penetrate into micropore gaps to complete precise cleaning by means of the ultralow surface tension of the fluorocarbon penetrant, meanwhile, a protective film is formed on the surface of a nickel-plated layer, and zero damage in the cleaning process is achieved. The product is good in stability, high in environmental protection property, simple and convenient in preparation method and suitable for industrial production.

The present invention relates to a method for preparing hydrocarbon double acids using a cyclic hydrocarbon oxidation catalyst, wherein adipic acid and dodecanedioic acid may be produced with high yield while solving the problem of environmental pollution, the adipic acid and the dodecanedioic acid being prepared by using an oxidation reaction of a cyclohexane-cyclohexanone mixture and an oxidation reaction of a cyclododecane-cyclododecanone mixture, respectively, in the presence of a vanadium phosphate oxide-based catalyst and / or a cobalt-manganese oxide-based catalyst.

The invention belongs to the technical field of sewage treatment, and particularly relates to a reverse osmosis scale inhibitor and a preparation method and application thereof. The reverse osmosis scale inhibitor is prepared from the following components in percentage by mass: 15 to 30 percent of polyepoxysuccinic acid, 10 to 25 percent of 2-acrylamide-2-methylpropanesulfonic acid / hydroxypropyl acrylate copolymer, 5 to 15 percent of polyaspartic acid, 3 to 8 percent of dodecanedioic acid and the balance of deionized water. The reverse osmosis scale inhibitor has the beneficial effects that the strong polarity of the AMPS in the reverse osmosis scale inhibitor and the sulfonic acid group provide excellent dispersity and calcium ion tolerance; the PASP and the DDA enhance the chelation and lattice distortion effects; bTA provides copper material corrosion inhibition protection, and corrosion of metal parts of a membrane system is prevented; the PESA, the AMPS / HPA copolymer, the PASP and the DDA are synergistically compounded, so that the calcium sulfate scale inhibitor has ultrahigh inhibition capability on calcium sulfate scale, and the scale inhibition effect of the calcium sulfate scale inhibitor is far better than that of a single component; the preparation process of the reverse osmosis scale inhibitor is physical mixing, conditions are mild, high-temperature and high-pressure or complex polymerization reaction is not needed, energy consumption is low, and industrial production is easy to achieve.

The application belongs to the field of medicine synthesis, and provides a preparation method of compound II, which comprises the following steps: reacting monomethyl dodecanedioate, N-hydroxysuccinimide and a condensing agent in an aprotic solvent to generate an active ester intermediate; and reacting compound I and an acid binding agent with the active ester intermediate to obtain compound II. Compound III can be prepared from compound II, the starting material of the steps is cheap and easy to obtain, the conditions are mild, the steps are simple, the yield is high, the product has high purity and stable chemical properties, the defects of high preparation cost and easy generation of impurities by column chromatography of compound III in the prior art are overcome, and the method is suitable for industrialized production.

The invention relates to the technical field of powder coatings, in particular to a high-adhesion uvioresistant polyester powder coating and a preparation method thereof. The problem that in the prior art, the mechanical property and the anti-ultraviolet property of a polyester powder coating cannot be considered at the same time is solved. The preparation method comprises the following steps: firstly, carrying out esterification and polycondensation on terephthalic acid, isophthalic acid, dodecanedioic acid, neopentyl glycol and trimethylolpropane; in the polycondensation process, hydroxyl-terminated polydimethylsiloxane and reaction type UVA are introduced step by step and covalently bonded to a polyester main chain through a chemical reaction; and finally, carrying out end capping by using trimellitic anhydride to obtain the modified polyester resin. And mixing the epoxy silane coupling agent with HAA, HALS and an inorganic filler pretreated by the epoxy silane coupling agent to obtain the powder coating. According to the coating, through the synergistic effect of the components and the process, the mechanical property is improved, meanwhile, the good anti-ultraviolet performance is kept, the comprehensive durability of the powder coating is remarkably improved, and the powder coating is suitable for high-durability outdoor coating.

The invention provides a shape memory type porous ink direct writing printing implantation intervention type micro medical device product and a preparation method thereof, dodecanedioic acid and glycerol are stirred and reacted under a vacuum condition to prepare a PGD prepolymer, then water-soluble inorganic salt particles are added, and curing is performed to obtain a PGD ink material for printing. The preparation method comprises the following steps: carrying out 3D printing molding by utilizing ink direct writing, curing, removing water-soluble inorganic salt particles, and freeze-drying to prepare an implanted and intervened micro medical device product. According to the preparation method disclosed by the invention, an implantation intervention type micro medical device product is prepared by coupling ink direct writing printing and PGD, and the PGD-based product is endowed with porous structure characteristics and drug loading property by utilizing water-soluble inorganic salt particles for the first time based on a particle percolation method; the effective scheme of the precise adjustment strategy of the mechanical strength and the drug loading characteristic required by clinical healing is realized, and particularly, a new thought is provided for related implantable miniature medical equipment products for intervertebral disc degeneration related research.

The application provides a hot melt adhesive for low-pressure injection molding and a preparation method thereof, and belongs to the technical field of hot melt adhesive materials for electronic components and circuit packaging. The hot melt adhesive for low-pressure injection molding is prepared from the following raw materials in parts by weight: adipic acid: 0.1-60 parts; dodecanedioic acid: 0.1-60 parts; 2-methylpentanediamine: 0.1-50 parts; dodecanediamine: 0.1-50 parts; caprolactam: 0.5-200 parts; plasticizer: 0.1-20 parts; antioxidant: 0.01-1 part; modifier: 0-10 parts; and flame retardant: 0-20 parts. The hot melt adhesive for low-pressure injection molding has high softening point and high fluidity, and can meet the high requirements of electronic components and battery circuit packaging.

This invention discloses an enzyme-sensitive PDC-type PROTAC modified with a human leukemia cell-targeting transmembrane peptide, its preparation method, and its applications, belonging to the field of tumor targeted therapy technology. This PDC-type PROTAC is composed of a hypoxia-inducible factor 1α (HIF-1α) protein fragment linked to imatinib via dodecanoic acid, and further modified with the human leukemia cell-targeting transmembrane peptide Cyclo-C9C-R and the cathepsin B-sensitive sequence GFLG. The modified PDC-type PROTAC can release the original drug under the catalysis of cathepsin B, with minimal impact on THP1 cell viability, but effectively inhibits the proliferation of K562 and KU812 cells, degrades target proteins, induces apoptosis, and affects the cell cycle. This gives the PDC-type PROTAC significant advantages in the preparation of anti-tumor drugs, particularly showing promising application prospects in the development of drugs targeting human chronic myeloid leukemia cells and human peripheral blood basophilic leukemia cells, opening up a new field for PROTAC drug development.

The invention discloses long-carbon-chain transparent nylon based on PACM copolymerization modification and a preparation method thereof.The preparation method of the long-carbon-chain transparent nylon comprises the steps that dodecanedioic acid and water are evenly mixed, a first mixture is obtained, a second mixture is added into the first mixture, a salt forming reaction is conducted, after the salt forming reaction is finished, the temperature is increased to 190-230 DEG C in the protective atmosphere, and the long-carbon-chain transparent nylon is obtained; adding a catalyst and an antioxidant for carrying out a pre-polycondensation reaction, after the pre-polycondensation reaction is finished, heating to 250-270 DEG C for carrying out a vacuum polycondensation reaction, cooling to room temperature, and granulating to obtain the long carbon chain transparent nylon based on PACM copolymerization modification; the second mixture is a mixture of 1, 6-hexamethylenediamine, 4, 4 '-diaminodicyclohexylmethane and water, and the long-carbon-chain transparent nylon has the advantages of good transparency, good toughness, good wear resistance, low water absorption, good dimensional stability and excellent mechanical properties.

The present application relates to the technical field of high polymer material, and more particularly to a preparation method of nylon 11, comprising the following steps: methyl esterification: dodecanedioic acid is dissolved in methanol, and dodecanedioic acid dimethyl ester is synthesized by dehydration under the action of a first catalyst; ester exchange: dodecanedioic acid dimethyl ester, dodecanedioic acid and methanol are dissolved in an organic solvent, a second catalyst is added, and dodecanedioic acid monomethyl ester is prepared by refluxing reaction in the organic solvent; ammonia addition: 11-amino-undecanoic acid is prepared by taking dodecanedioic acid monomethyl ester as a raw material and through amide reaction and Hoffmann rearrangement; and polymerization: PA11 is obtained by high-temperature polymerization of 11-amino-undecanoic acid under nitrogen protection. The preparation method has the characteristics of short process route and stable intermediates, and can be suitable for batch production and continuous production.

The present application belongs to the solder paste material field of surface assembly technology, and relates to a low-temperature solder paste and a preparation method thereof. The low-temperature solder paste contains a tin-bismuth-based alloy powder and a soldering paste. The soldering paste contains rosin, an active agent, a thixotropic agent, a surfactant, a corrosion inhibitor and an organic solvent. The active agent is a composite of an organic amine and an organic acid. The organic amine is at least one selected from ethylenediamine, monoethanolamine, triethanolamine and ethylamine. The organic acid is at least one selected from 2-pyridine carboxylic acid, oxalic acid, succinic acid, glutaric acid, malonic acid, phthalic acid and dodecanedioic acid. The boiling point of the organic solvent is 190-280 DEG C. The solder paste provided by the present application not only has low-temperature property and is suitable for applications with more low-temperature welding requirements, solves the problem that the medium and high-temperature solder paste is not widely used, but also has the characteristics of less solder beads after welding and low residue.

The invention relates to the technical field of wood protection, in particular to a natural environment-friendly sterilization mildew-proof spray for wood. The core of the spray is a multi-stage composite carrier system, mesoporous silica is adopted to load a natural bactericidal mildew preventive, sodium alginate is hydroformylated through sodium periodate and reacts with dopamine hydrochloride Schiff base to construct an adhesion layer on the surface of the mesoporous silica, and dodecanedioic acid and calcium chloride are further crosslinked to form a conchiolin-like strong adhesion structure. The structure effectively anchors the active components on the wood surface, greatly improves the environmental stability, slow release performance and mechanical binding force of the bactericidal mildew inhibitor, and inhibits the loss of active substances. The prepared composite material can still keep a protection effect in extreme environments such as high humidity and high temperature, can be widely applied to the field of green protection of high-grade wood furniture and handicrafts, and has excellent safety, environmental protection property and industrialization prospect.

The present invention relates to a cyclododecatriene catalytic oxidation method, which comprises that cyclododecatriene, an oxidizing agent, an optional solvent and a catalyst are contacted to carry out an oxidation reaction, and the catalyst is a graphene-loaded polyacid catalyst. The graphene-loaded polyacid catalyst is used for catalytic oxidation of cyclododecatriene, so that the raw material conversion rate and the selectivity of the target product dodecanedioic acid can be effectively improved.

The application belongs to the technical field of organic synthesis and particularly relates to a preparation method of monotert-butyl octadecanedioate. Specifically, dodecanedioic acid, dichloromethane and DMF are reacted, temperature is controlled, an acylation reagent is added dropwise, compound 1 is obtained after reaction and concentration under reduced pressure; compound 1, dimethylbenzene, palladium charcoal and an organic base are reacted, nitrogen is replaced, hydrogen is introduced under temperature control, nitrogen is replaced after reaction, filtration and concentration are performed, and compound 2 is obtained; tert-butyl acrylate is added into an acetic acid aqueous solution, compound 2 is added dropwise, reaction is performed, pH is adjusted, extraction is performed, filtration and concentration are performed, and compound 3 is obtained; compound 3 is added into dichloromethane, temperature is controlled, aluminum chloride is added, a reducing agent is added dropwise, reaction is performed, filtration is performed, pH is adjusted, liquid separation is performed, concentration and recrystallization are performed, and di-tert-butyl octadecanedioate is obtained; di-tert-butyl octadecanedioate, lithium hydroxide and tert-butyl alcohol are reacted, filtration is performed, pH is adjusted, extraction is performed, concentration and recrystallization are performed, and monotert-butyl octadecanedioate is obtained. The method has low production cost and high safety.

A substantially anhydrous dermatological concentrate consisting essentially of: (a) a long-chain alkyl dicarboxylic acid having a poor water solubility and having from six to twelve carbon atoms selected from the group consisting of adipic acid, azelaic acid, sebacic acid and dodecanedioic acid; and (b) an amidoamine. The substantially anhydrous dermatological concentrate may comprise salicylic acid.

The invention relates to the technical field of high polymer materials, and provides a printing polyvinyl chloride film for advertising cloth and a preparation method thereof. The inkjet polyvinyl chloride film for the advertising cloth comprises the following components in parts by weight: 100 parts of polyvinyl chloride, 30-45 parts of a plasticizer, 4-8 parts of a lubricant, 2-3 parts of a heat stabilizer, 8-12 parts of modified calcium carbonate and 0.5-1 part of superfine silica powder, a modifier of the modified calcium carbonate comprises isocaprylic acid and dodecanedioic acid. According to the technical scheme, the problem that the mechanical property of the inkjet polyvinyl chloride film for the advertising cloth in the prior art is insufficient is solved.

The invention provides a macromolecular corrosion inhibitor for high-strength and corrosion-resistant concrete, a preparation method of the macromolecular corrosion inhibitor and the concrete, and belongs to the technical field of concrete corrosion inhibition. The water dispersion is mainly prepared from 1, 4-succinic acid, 1, 3-propylene glycol, N-methyldiethanolamine, dodecanedioic acid, triethanolamine, tartaric acid, diethylenetriamine and the like, functional groups with corrosion inhibition performance, such as alkylol amine groups, are introduced into a molecular chain of the water dispersion, an end group is grafted and terminated by imidazoline, the prepared water dispersion is easy to use in concrete construction, and the corrosion inhibition performance of the water dispersion is greatly improved. The macromolecular corrosion inhibitor product is difficult to dissolve in water, long in retention time in concrete and capable of continuously inhibiting corrosion of the concrete, and due to the fact that the corrosion inhibitor molecules are large, the prepared aqueous dispersion liquid has the obvious effect of improving the breaking strength of the concrete after participating in concrete forming. The effects of persistent corrosion inhibition and strength improvement on the concrete are realized.

The application discloses a kind of electrolyte for sintered foil capacitor and preparation process thereof, comprising the following components by mass percentage: mixed solvent 65-75%, main solute 4.0-6.0%, corrosion regulator 1.3-2.8%, repair stabilizer 0.15-0.6%, wetting accelerator 0.1-0.3%; the rest is pH regulator, adjust electrolyte pH to 7.2-7.8; mixed solvent consists of gamma-butyrolactone and ethylene glycol; main solute is branched dodecanedioic acid ammonium; corrosion regulator consists of boric acid and ammonium pentaborate; repair stabilizer consists of phosphoric acid and sodium hypophosphite; wetting accelerator is polyoxyethylene sorbitan monooleate; pH regulator is 25% ammonia water; gamma-butyrolactone and ethylene glycol mixed solvent are used, and the ratio is optimized, with good solubility and low viscosity, can fully infiltrate the porous structure of sintered foil, ensure effective contact area.

The invention discloses a low-VOC (volatile organic compound) high-performance copolyamide hot melt adhesive, and relates to the technical field of hot-melt low-VOC materials, and the technical key point is that the low-VOC high-performance copolyamide hot melt adhesive is prepared by copolymerizing the following raw materials in parts by mass: 80-120 parts of a binary acid system, 50-100 parts of a diamine system, 0.5-2 parts of an antioxidant and 1-3 parts of a lubricant; wherein the binary acid system is a mixture of adipic acid, sebacic acid, dodecanedioic acid and tridecanedioic acid; the diamine system is a mixture of pentamethylene diamine, hexamethylenediamine and decamethylene diamine; by optimizing a binary acid-diamine quaternary / ternary compound system and combining vacuum devolatilization and precise process control, the total content of residual monomers and oligomers of the hot melt adhesive is smaller than or equal to 85 ppm and far lower than that in the prior art, the VOC release amount is only 0.27-0.32 mg / m < 3 >, the hot melt adhesive meets the environmental protection standard, and the risk of releasing harmful substances in the using process is avoided from the source.

The present application relates to a kind of full synthesis easy-to-clean copper cutting fluid and its preparation method.The raw material of the full synthesis copper cutting fluid includes composite rust inhibitor, chelating agent, special amine, aluminum copper corrosion inhibitor, lubricant, defoaming agent and solvent, and the composite rust inhibitor is composed of sebacic acid and dodecanedioic acid.The composite rust inhibitor can overcome discoloration corrosion well, has obvious cost advantage, and will not produce obvious color residue, can meet the existing user demand.Sebacic acid and dodecanedioic acid are not long carbon chain (C10 / C12) can be embedded in the gap of lubricating film, improve boundary lubrication performance, make friction coefficient reduce 5~8%, adapt to medium-low speed heavy load processing, not easy to break in long-term cyclic use (>6 months), especially suitable for the processing of nickel-containing copper alloy, can reduce the risk of pitting.

The invention provides a preparation method of an anti-rust and anti-corrosion fully-synthetic magnetic material cutting fluid, which comprises the following steps: adding 30-40% of the total deionized water, adding monoethanolamine accounting for 8-12% of the total weight of the cutting fluid and triethanolamine accounting for 5-8% of the total weight of the cutting fluid, uniformly mixing, adding 5-8% of dodecanedioic acid, 3-5% of sebacic acid and 0.5-1.5% of 5-methylbenzotriazole, heating to 65-75 DEG C, stirring for 1-2 hours, and cooling to room temperature to obtain the anti-rust and anti-corrosion fully-synthetic magnetic material cutting fluid. Stirring and reacting for 60-120 minutes at a constant temperature; cooling to 30-40 DEG C, adding the rest of deionized water, then adding 0.5%-5.0% of modified hyperbranched polyester, and then adding 0.5%-3% of modified nano silicon dioxide sol; adding 3%-8% of polyether L-64, 1%-2% of a triazine bactericide and 0.1%-0.3% of an organic silicon defoaming agent, uniformly stirring, and filtering, so as to obtain a finished product. The cutting fluid prepared by the invention has the advantages of high-efficiency lubrication, specific sedimentation and long-acting stability.

The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of octadecanedioic acid monobenzyl ester. The preparation method comprises the following steps: firstly, reacting dodecanedioic acid with dichloromethane and N, N-dimethylformamide, adding an acylation reagent, and performing vacuum concentration to obtain a compound 1; secondly, reacting the compound 1 with dimethylbenzene, palladium carbon and organic alkali in a hydrogen atmosphere to obtain a compound 2; then, benzyl acrylate reacts with the compound 2 in an acetic acid aqueous solution to obtain a compound 3; and finally, reacting the compound 3 with Lewis acid and a reducing agent in dichloromethane, performing filtration, pH adjustment, liquid separation and concentration to obtain an octadecanedioic acid monobenzyl ester crude product, and performing recrystallization to obtain a final product. According to the method, cheap dodecanedioic acid is adopted as a starting material, the reaction process is simpler, safer and more efficient, the production cost is greatly reduced, and commercial production is facilitated.

A substantially anhydrous dermatological concentrate comprising (a) a long-chain alkyldicarboxylic acid having 6 to 12 carbon atoms and low solubility in water, selected from the group consisting of adipic acid, azelaic acid, sebacic acid, and dodecanediic acid; and (b) an amidoamine. The substantially anhydrous dermatological concentrate may contain salicylic acid.

The present application relates to a kind of environment-friendly bacteriostatic water-soluble coolant and its preparation method, belong to the technical field of coolant.It includes the following raw materials, by weight percentage, environment-friendly composite oil 30%~50%, dicyclohexylamine 6%~8%, surfactant 4%~5%, modified graphene nanofluid 3%~5%, ethylene glycol butyl ether 2.5%~3.5%, pH adjusting stabilizer 1%~2%, alcohol ether carboxylic acid 0.8%~1.2%, dodecanedioic acid 0.4%~0.6%, benzene triazole 0.2%~0.4%, silicone defoaming agent 0.1%~0.3%, deionized water balance.The formula and preparation process of the coolant of the present application have the characteristics of green environmental protection, and the prepared coolant has good bacteriostatic property.