664 results about "Hydroxybenzoic acid" patented technology

To provide a timber antiseptic agent which exhibits superior safety and superior antibacterial performance with low influence on the human body and environment.SOLUTION: The present invention relates to a timber antiseptic agent containing an alkyl 4-hydroxybenzoate represented by formula (1) [where R represents an alkyl group having 5 to 10 carbon atoms] or a salt thereof.SELECTED DRAWING: None

A construction method for and a use of rhizoma pinellinae praeparata decoction piece, standard decoction and formula granule characteristic spectra. The construction method comprises the following steps: dissolving a test sample by using a solvent, and extracting to obtain a solution to tested; and measuring said solution by using high-performance liquid chromatography (HPLC) to obtain rhizoma pinellinae praeparata decoction piece, standard decoction and formula granule characteristic spectra, wherein chromatographic conditions of the HPLC are as follows: the chromatographic column is a C18 column; and gradient elution is performed by using acetonitrile as mobile phase A and a 0.1% phosphoric acid aqueous solution as mobile phase B. HPLC is used, gradient elution is performed by using acetonitrile and a 0.1% phosphoric acid aqueous solution as mobile phases, and 4-hydroxybenzoic acid is used as a reference object, so that rhizoma pinellinae praeparata decoction piece, standard decoction and formula granule HPLC characteristic spectra are established; the method has good repeatability and precision, is stable and reliable, and can control the quality of rhizoma pinellinae praeparata decoction pieces, a standard decoction and formula granules.

Methods for preparing a salt of urolithin A and, in turn, urolithin A. Combining in an alkaline aqueous solution a copper-containing catalyst, 2-bromo-5-hydroxybenzoic acid, and resorcinol produces a salt of urolithin A. Urolithin A has been prepared by protonating a salt of the compound.

The invention belongs to the technical field of high polymer materials, and particularly relates to spinning-grade all-aryl polynaphthyl ester resin and a preparation method thereof. According to the invention, p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, aromatic dicarboxylic acid and ethylene glycol monomer are adopted as raw materials, polymerization reaction is carried out under the action of the catalyst, spinning-grade all-aryl polynaphthyl ester resin is successfully obtained under specific reaction conditions, and the spinning-grade all-aryl polynaphthyl ester resin has high molecular weight, low impurity content and good heat resistance, and can be used for preparing the spinning-grade all-aryl polynaphthyl ester resin. The melt fluidity is good, the shear thinning phenomenon is more obvious, and the method can be directly used for preparing the polynaphthalene ester fiber.

The invention provides a polyarylester nanofiber and a preparation method thereof, and the preparation method comprises the following steps: firstly, carrying out acetylation reaction on 4-hydroxybenzoic acid (HBA) and 6-hydroxy-2-naphthoic acid (HNA) to obtain acetylated HBA and acetylated HNA, and then carrying out copolymerization on acetylated HBA and acetylated HNA and 4-hydroxybutyric acid (GHB) to obtain HBA / GSB / HNA copolymerized arylester granules B; the preparation method comprises the following steps: carrying out blending spinning on granules B and HBA / HNA copolymerized aromatic ester granules A obtained by copolymerizing acetylated HBA and acetylated HNA in the prior art, putting the obtained blended polyarylate fibers into an organic solvent containing a strong base, carrying out chemical etching and deprotonation, carrying out disassembly from top to bottom to obtain a polyarylate nanofiber suspension, and finally carrying out suction filtration and drying to obtain the polyarylate nanofibers. According to the preparation method disclosed by the invention, the blended polyarylester fiber containing an aliphatic chain is subjected to etching and deprotonation treatment through strong base to disassemble the polyarylester nanofiber, and a certain amount of-CH2-structure is introduced into a main chain, so that disassembly preparation of the nanofiber is facilitated, and the polyarylester nanofiber with uniform diameter and length and controllable length-diameter ratio is obtained.

A transformant produced by introducing a chorismate pyruvate-lyase gene comprising DNA (a), (b), (c), (d) or (e) and a 4-hydroxybenzoate hydroxylase gene comprising DNA (f), (g), (h), (i) or (j) into a Hydrogenophilus bacterium can utilize carbon dioxide as a sole carbon source to produce protocatechuic acid with high efficiency. (a) DNA that comprises the nucleotide sequence represented by SEQ ID NO:1; (b) DNA that comprises a nucleotide sequence having 90% or higher identity with SEQ ID NO:1 and encodes a polypeptide having a chorismate pyruvate-lyase activity; (c) DNA that encodes a polypeptide comprising the amino acid sequence represented by SEQ ID NO:2; (d) DNA that encodes a polypeptide comprising an amino acid sequence having 90% or higher identity with SEQ ID NO:2 and having a chorismate pyruvate-lyase activity; (e) DNA that encodes a polypeptide comprising an amino acid sequence having the deletion, substitution, insertion or addition of 1 to 10 amino acid residues in the amino acid sequence represented by SEQ ID NO:2 and having a chorismate pyruvate-lyase activity; (f) DNA that comprises the nucleotide sequence represented by SEQ ID NO:3; (g) DNA that comprises a nucleotide sequence having 90% or higher identity with SEQ ID NO:3 and encodes a polypeptide having a 4-hydroxybenzoate hydroxylase activity; (h) DNA that encodes a polypeptide comprising the amino acid sequence represented by SEQ ID NO:4; (i) DNA that encodes a polypeptide comprising an amino acid sequence having 90% or higher identity with SEQ ID NO:4 and having a chorismate pyruvate-lyase activity; and (j) DNA that encodes a polypeptide comprising an amino acid sequence having the deletion, substitution, insertion or addition of 1 to 30 amino acid residues in the amino acid sequence represented by SEQ ID NO:4 and having a 4-hydroxybenzoate hydroxylase activity.

The invention discloses a high-temperature-resistant liquid crystal polyarylester and a preparation method thereof, the liquid crystal polyarylester is formed by polymerizing monomers, and the monomers are composed of p-hydroxybenzoic acid HBA, 4, 4 '-biphenol BP, terephthalic acid TA, 2, 6-naphthalic acid NDA and 9, 9-bis [4-(4-methoxycarbonyl phenoxy) phenyl] fluorene; the corresponding molar ratio of the monomers is (50-60): (20-25): (5-10): (10-15): (1-5), and the sum of the molar ratios of the monomers is 100. By adding a small amount of 2, 6-naphthalic acid, the melting point Tm of LCP is reduced, the processing temperature window is widened, and processing is facilitated; by adding a small amount of bisphenol fluorene containing ether bonds, the toughness and processability of the LCP are improved while the glass-transition temperature Tg of the LCP is improved.

The invention relates to a series of cobalt-nitrogen-carbon confinement cobalt nano-particle catalysts with high catalytic activity and high cycle stability and a preparation method thereof, wherein the cobalt-nitrogen-carbon confinement cobalt nano-particle catalysts are obtained by changing the ratio of cobalt-cobalt Prussian blue analogue to melamine in a precursor and calcining. Under the conditions of different ions, organic matters and complex water quality, excellent catalytic activity is still maintained, and efficient degradation of p-hydroxybenzoic acid is realized. The core-shell structure formed by the cobalt-nitrogen-carbon confinement cobalt nanoparticles in the catalyst plays a very important role in exposure of active sites and formation of local high instantaneous concentration, persulfate can be effectively activated to generate non-free radical dominated high-valence cobalt oxygen species, migration and interaction with pollutants are enhanced, and the pollution to the pollutants is reduced. And the characteristics of high activity, strong environmental resistance, high cycle stability and the like of the catalyst are realized. The catalyst has excellent removal efficiency on various pollutants, preparation and characteristics of the catalyst are not reported before, and the catalyst has a good prospect in the application field of complex matrix organic wastewater.

The invention discloses a degradable packaging material and a preparation method thereof, and relates to the technical field of packaging materials. When the degradable packaging material is prepared, firstly, hydroxyl-terminated polylactic acid reacts with 3-chloropropionyl chloride, then reacts with 1, 2-bis (vinyl phosphine) ethane, and finally reacts with 4-mercaptophenylboronic acid to prepare modified polylactic acid; secondly, enabling the halloysite nanotube pretreated by trimethoxy (2-phenethyl) silane to react with 3, 4-dihydroxy benzoic acid, so as to obtain a modified halloysite nanotube; finally, mixing and hot-rolling the modified polylactic acid, the modified halloysite nanotube and cellulose to obtain the degradable packaging material. The degradable packaging material prepared by the preparation method disclosed by the invention has excellent degradability, antibacterial property and flame retardance.

The invention discloses a bisphenol F degradation gene cluster bpf and application thereof. The strain DN12 is separated and can degrade the BPF and grow by taking the BPF as the unique carbon source and energy. On the basis, a BPF degradation gene cluster bpf is obtained from the strain DN12 by adopting whole genome and comparative transcriptome sequencing analysis. Three different degrading enzymes (two-component oxidase BpfAB, monooxygenase BpfC and hydrolase BpfD) are found in the gene cluster and can catalyze gradual degradation of BPF, and a simple aromatic ring compound p-hydroxybenzoic acid is generated.

The invention relates to the technical field of fiber preparation, in particular to a liquid crystal polyarylester polymer, a liquid crystal polyarylester fiber and a preparation method.The preparation method of the liquid crystal polyarylester polymer comprises the steps that under the inert gas atmosphere, p-hydroxybenzoic acid, fluorine-containing benzoic acid monomers, 2-hydroxy-6-naphthoic acid and a catalyst are added into acetic anhydride; heating to carry out prepolymerization reaction; and after the prepolymerization reaction is finished, keeping the inert gas atmosphere, raising the temperature, carrying out polycondensation reaction, continuously discharging acetic anhydride in the polycondensation reaction process, controlling the viscosity of the reaction polymer, and obtaining the liquid crystal polyarylate polymer after the reaction is finished. The liquid crystal polyarylester polymer is subjected to melt spinning to prepare the liquid crystal polyarylester fiber. The liquid crystal polyarylester fiber has good mechanical properties and low water absorption, has high cohesiveness with other materials due to excellent interface compounding performance, and has wide application prospects in the fields of 5G communication and the like.

The invention discloses streptomyces bulbus as well as a multifunctional fungicide and application thereof. According to the invention, firstly, a strain of Streptomyces tauricus zhanshen-LZ-12 is separated and screened from straw returning soil, and the preservation number of the strain is CGMCC (China General Microbiological Culture Collection Center) No.34456. The invention also discloses a preparation method of the Streptomyces tauricus zhanshen-LZ-12. The strain has the functions of degrading cellulose, decomposing protein, fixing nitrogen, resisting salt, degrading phenolic acid autotoxic substances (benzoic acid, p-hydroxybenzoic acid and cinnamic acid) and the like. Bacterial powder obtained after fermentation of the bacterial strain is uniformly mixed with bacillus bacterial powder to obtain the multifunctional bacterial agent, and when straw returning or composting is carried out, the multifunctional bacterial agent is adopted, straw decomposition can be accelerated, soil ecology can be improved, crop growth can be promoted, and the stress resistance of crops can be enhanced.

The invention discloses a method for producing mRNA (messenger ribonucleic acid) template plasmids by fermenting escherichia coli. When the recombinant escherichia coli is fermented and cultured, a seed solution of the recombinant escherichia coli is inoculated into a basic culture medium to be fermented and cultured until the OD600 value of fermentation liquor is 18-22, then a fed-batch culture medium is continuously added at the feeding rate of 5-15 mL / L / h to be subjected to continuous fed-batch fermentation culture, the basic culture medium contains 0.05-0.2 mmoL / L of ferric salt compound and 0.05-0.2 mmoL / L of copper chloride dihydrate, and the basic culture medium contains 0.05-0.2 mmoL / L of ferric salt compound and 0.05-0.2 mmoL / L of copper chloride dihydrate. The basal culture medium contains 10-15 g / L of copper chloride dihydrate and 100-300 mg / L of p-hydroxybenzoic acid, the carbon source of the basal culture medium contains 0.1-0.3 mmoL / L of a ferric salt compound, 0.1-0.3 mmoL / L of copper chloride dihydrate and 100-300 mg / L of p-hydroxybenzoic acid, the carbon source of the fed-batch culture medium contains 360-480 g / L of glycerol, and the ferric salt compound is one or more of ferrous citrate, ferric ammonium citrate or ferrous sulfate heptahydrate. According to the method, the yield and superhelix content of the mRNA template plasmids are improved by optimizing the culture medium formula and culture conditions, and large-scale production of the high-quality target mRNA template plasmids is facilitated.

The invention provides a preparation method of a rare earth modified flame-retardant material and an application of the rare earth modified flame-retardant material in fabric flame retardance, and the method comprises the following steps: carrying out combination coordination on phosphonitrilic chloride trimer and p-hydroxybenzoic acid to form phenoxy, and reacting with rare earth chloride to obtain the rare earth modified flame-retardant material. The method has the advantages of simple preparation process, no need of high-temperature and high-pressure reaction, no pollution and easiness in large-scale production. The invention further provides a method for preparing the flame-retardant fiber from the rare earth modified flame-retardant material CSHB-X. The rare earth modified flame-retardant material has good flame-retardant performance on fiber-forming fabric, and the afterflame time of the fiber-forming fabric can be effectively shortened.

The invention discloses a preparation method and application of a zinc gallate catalyst for synthesizing carbon dioxide-based polycarbonate, and belongs to the technical field of catalysts.The zinc gallate catalyst is prepared through the steps that zinc salt and gallic acid (3, 4, 5-trihydroxybenzoic acid) are subjected to a reaction, low-carbon-number alcohol serves as a complexing agent, and a reaction solution is obtained; the copolymer can be applied to ring-opening copolymerization of carbon dioxide and epoxide, and a third monomer even a fourth monomer can be added on the basis to carry out ternary copolymerization and quaternary copolymerization to generate aliphatic polycarbonate with a multi-element structure. The activity of the zinc gallate catalyst for catalyzing ring-opening copolymerization of carbon dioxide and epoxypropane is larger than 900 g polymer / g catalyst, the content of carbonate units is larger than 96%, the selectivity is larger than 91%, the balance of the activity and the content of the carbonate units can be met, the synthesis process is simple, the reactant cost is low, and the zinc gallate catalyst is very suitable for industrial production of carbon dioxide-based polycarbonate.

The invention discloses a method for preparing high molecular weight thermotropic liquid crystal polyester through melt coupling solid phase polycondensation. The method comprises the following steps: mixing p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid and a catalyst 1-methylimidazole according to a specific molar ratio of (70-75): (25-30) to synthesize a liquid crystal polyester prepolymer with specific logarithmic viscosity; the preparation method comprises the following steps: crushing and drying a liquid crystal polyester prepolymer, placing prepolymer particles in a solid phase polycondensation device, accurately controlling the time and temperature of the polycondensation reaction, carrying out heating reaction in a nitrogen atmosphere to obtain high molecular weight thermotropic liquid crystal polyester, taking out the high molecular weight liquid crystal polyester, and carrying out viscosity test. In the preparation process of the prepolymer, the prepolymer with proper logarithmic viscosity can be effectively prepared by controlling the reaction temperature and time, so that the controllable preparation of the polymer is realized; the solid-phase polycondensation time required for obtaining the high-molecular-weight polymer is shortened by crushing the prepolymer into particles with different diameters, so that the solid-phase polycondensation efficiency is improved.

The invention relates to the technical field of liquid crystal polymers, and discloses a high-temperature-resistant, electricity-conducting and heat-conducting graphene-LCP material and a preparation method thereof.The preparation method comprises the steps that a diacid monomer, p-hydroxybenzoic acid and 4, 4 '-bis (4-hydroxyphthalimide)-benzamido benzene are subjected to a carboxyl reaction, liquid crystal polyarylester is obtained and mixed with graphene oxide, and the high-temperature-resistant, electricity-conducting and heat-conducting graphene-LCP material is obtained. The liquid crystal polyarylester molecular chain contains an imide ring, so that the thermal decomposition mass loss temperature of the liquid crystal polyarylester LCP material can be improved. The liquid crystal polyarylester contains amido bonds and forms strong interaction with hydroxyl and carboxyl on the surface of the graphene oxide, the interfacial compatibility between the graphene oxide and the liquid crystal polyarylester can be improved, the graphene oxide does not need surface modification and has good dispersity in the LCP material, a conductive path is formed, and the conductivity and the antistatic performance are improved.

The invention relates to the technical field of textile, and particularly discloses a preparation method of an anti-mosquito fabric and the anti-mosquito fabric prepared by the method, and the preparation method specifically comprises the following steps: S1, adding trehalose, an anti-mosquito agent and an emulsifier into water, performing uniform ultrasonic dispersion, adding sodium tripolyphosphate, and performing stirring reaction for a period of time to obtain a trehalose microcapsule solution; s2, carrying out activating treatment on mono-6-amino-6-deoxy-beta-cyclodextrin by adopting an activating agent, adding the activated mono-6-amino-6-deoxy-beta-cyclodextrin into a trehalose microcapsule solution, carrying out stirring reaction for a period of time, then adding 2, 3-dihydroxybenzoic acid, carrying out heating reaction, and carrying out spray drying, so as to obtain an anti-mosquito microcapsule; s3, adding the anti-mosquito microcapsules into water, performing uniform ultrasonic dispersion to obtain anti-mosquito microcapsule dispersion liquid, soaking the fabric in the anti-mosquito microcapsule dispersion liquid, and drying to obtain the anti-mosquito fabric. The anti-mosquito fabric prepared by the preparation method disclosed by the invention has a relatively high mosquito repelling rate and a long-acting mosquito repelling effect.

Use of a lubricating composition in an ammonia combustion engine The present invention relates to the use of a lubricating composition comprising at least one alkali or alkaline-earth salt of hydroxybenzoic acid, optionally substituted by at least one hydrocarbon group, called hydroxybenzoate salt, in an ammonia combustion engine. It also relates to the use of said hydroxybenzoate salt as a corrosion retardant in an ammonia combustion engine. It also relates to a method for lubricating an ammonia combustion engine, comprising a step of bringing at least one mechanical part of said engine into contact with a lubricating composition comprising at least said hydroxybenzoate salt. Figure for abstract: None

The invention discloses an anti-aging anticorrosive coating and a preparation method thereof, and relates to the field of coatings. When the anti-aging and anti-corrosion coating is prepared, layered magnesium aluminum hydroxide and 3, 5-di-tert-butyl-4-hydroxybenzoic acid are subjected to a reaction, and anti-aging layered magnesium aluminum hydroxide is prepared; the preparation method comprises the following steps: reacting the anti-aging layered magnesium aluminum hydroxide with chloropropyltrimethoxysilane and N-(2-(N, N-dimethylamino) ethyl) maleimide to prepare a modified layered magnesium aluminum hydroxide; the preparation method comprises the following steps: carrying out a reaction on polytetrahydrofuran, 1H-pyrrole-2, 5-diformaldehyde dioxime, n-dodecyl phosphonic acid, isophorone diisocyanate and diphenylmethane diisocyanate to prepare a prepolymer solution; and uniformly mixing the prepolymer solution with the modified layered magnesium-aluminum hydroxide and aluminum trichloride, and then adding polyether amine to prepare the anti-aging and anti-corrosion coating. The anti-aging anticorrosive paint prepared by the invention has good corrosion resistance, flame retardance, tensile strength and self-repairing performance.

The invention relates to the technical field of high polymer materials, and relates to a preparation method of a liquid crystal polymer. The preparation method specifically comprises the following steps: mixing p-hydroxybenzoic acid, 2, 5-di-tert-butylhydroquinone, 2, 2 '-hydroxy-9, 9'-spirobifluorene, terephthalic acid, an acylation reagent and a catalyst according to a specific ratio to obtain a reaction mixture; carrying out a prepolymerization reaction on the reaction mixture to obtain a prepolymer; and performing solid-phase polycondensation reaction on the prepolymer in an inert gas atmosphere to obtain the liquid crystal polymer. A proper amount of spirobifluorene structure is introduced to a molecular chain, so that the crystallization speed of the liquid crystal polymer can be properly slowed down, and the cooling speed of a liquid crystal polymer melt can be effectively reduced, so that the weld mark strength of the liquid crystal polymer is improved while the tensile strength of the liquid crystal polymer is ensured; meanwhile, the highly symmetrical biphenyl structure is matched with other molecular structures, so that the thermal stability and processability of the liquid crystal polymer can be further improved.

The invention discloses a smoke-suppression flame-retardant ecological board and a preparation method thereof. The ecological board comprises a base material, a flame-retardant adhesive layer and a facing layer which are sequentially stacked, wherein the flame-retardant adhesive layer is prepared from the following raw materials: 100 parts of urea-formaldehyde resin, 10-15 parts of a phosphorus-nitrogen composite flame retardant and 5-10 parts of flame-retardant filler; the preparation method of the phosphorus-nitrogen composite flame retardant comprises the following steps: carrying out an aminomethylation reaction on p-hydroxybenzoic acid, ethanolamine and paraformaldehyde which are used as raw materials in a molar ratio of 1: (1-1.2): (2-2.2) to prepare a Mannich base intermediate; and carrying out substitution reaction on the Mannich base intermediate and phosphonitrilic chloride trimer serving as raw materials according to the molar ratio of (3-7): 1. The phosphorus-nitrogen flame retardant disclosed by the invention is high in content of phosphorus and nitrogen elements and uniform in distribution ratio, and has more excellent synergistic smoke suppression and flame retardant effects compared with an existing physical compound system.

The invention belongs to the technical field of scale inhibitors, and particularly relates to a slow-release scale inhibitor and a preparation method thereof.The preparation method comprises the steps that 3, 4, 5-allyl trihydroxybenzoate, itaconic acid, sodium hydrogen sulfite, methacryloyloxyethyl-n-hexadecyl-dimethyl ammonium bromide and deionized water are mixed, after water bath heating, an ammonium persulfate aqueous solution is slowly added, and the scale inhibitor is obtained after reaction; the preparation method comprises the following steps: dissolving agar in deionized water, adding polyethylene glycol modified sodium alginate and a scale inhibitor into the deionized water, stirring, dropwise adding into edible oil to obtain gel microspheres, adding the gel microspheres into a calcium chloride aqueous solution, slowly stirring, cross-linking, cleaning and drying to obtain the slow-release scale inhibitor. The hydrogel microspheres swell to slowly release the scale inhibitor, meanwhile, the released scale inhibitor is hydrolyzed in water, ester groups are slowly broken, polycarboxylic acid, 3, 4, 5-trihydroxybenzoic acid and hydroxyethyl-n-hexadecyl-dimethyl ammonium bromide are slowly released, and good scale inhibition and corrosion inhibition effects are achieved.

The invention belongs to the field of medicinal chemistry, and particularly relates to an 8-position hydroxyurolithin A derivative as well as a preparation method and application thereof. According to the method, 2-bromo-5-(benzyl methoxy)-benzoic acid is prepared from 2-bromo-5-hydroxybenzoic acid through hydroxyl protection, then cyclization, etherification and deprotection reaction are carried out, the reaction conditions are milder, the reaction time is shorter, the yield is higher, groups sensitive to acid and alkali and various substrates can well tolerate the reaction conditions, and the method is suitable for industrial production. The 8-site hydroxyurolithin A derivative is prepared, the obtained derivative is targeted to PDE2 small molecules, and the 8-site hydroxyurolithin A derivative has huge potential for treating neurodegenerative diseases such as Alzheimer's disease.

The invention provides high-strength and high-toughness PET (Polyethylene Terephthalate) foam as well as a raw material composition and a preparation method thereof. The raw material composition comprises: 100 parts of PET resin; 0.3 to 0.75 part of a dispersion phase; 10 parts or less of naphthyl hydroxyformic acid-p-hydroxybenzoic acid copolyester; and 10 parts or less of a thermoplastic elastomer. The invention further provides high-strength and high-toughness PET foam prepared from the raw material composition and a preparation method of the high-strength and high-toughness PET foam. The PET foam prepared by the invention has good mechanical properties, and especially has relatively high compression strength, shear strength and shear elongation at break.

The invention relates to the technical field of preparation of benzoate compound single crystals, in particular to a benzoate compound single crystal as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, taking o-hydroxybenzoic acid and hexahydrofuran [3, 2-b] furan-3, 6-diol or mannitol or sorbitol as raw materials, taking ethylene glycol as a solvent, mixing, and stirring to react; and S2, after the reaction is finished, carrying out suction filtration to obtain a benzoate compound, recrystallizing and drying to obtain a benzoate compound single crystal. Experiments prove that the benzoate compound prepared by the invention can obviously promote the growth of corn roots and increase the plant biomass. The single-crystal structure has the advantages of good stability, good application effect, low experimental dosage, low toxicity, no pollution to the environment and the like, and can be widely used as a plant root-promoting stimulant.

The present invention relates to the use of a lubricant composition comprising at least one alkali salt or alkaline earth salt of hydroxybenzoic acid, optionally substituted with at least one hydrocarbon group, referred to as hydroxybenzoate salt, in an ammonia combustion engine. The invention also relates to the use of said hydroxybenzoate salt as a corrosion retardant in an ammonia combustion engine. The invention further relates to a method for lubricating an ammonia combustion engine, comprising a step of bringing at least one mechanical part of said engine into contact with a lubricant composition comprising at least said hydroxybenzoate salt.

The invention belongs to the technical field of biomedical polyurethane materials, and particularly discloses an antibacterial waterborne polyurethane material, a preparation method of the antibacterial waterborne polyurethane material and application of the antibacterial waterborne polyurethane material in preparation of medical catheters. 8 to 15% of oligomeric polyether glycol; 1-3% of oligomeric hydroxyl-terminated polybutadiene; 2-4% of acrylate polyethylene glycol dopamine; 2 to 4% of hydroxyl-terminated polyvinylpyrrolidone; 2-6% of a hydrophilic chain extender containing a tertiary amine group; 1 to 3 percent of acrylic acid-2-hydroxyethyl ester; 2-6% of a 1, 3, 4, 5-trihydroxybenzoic acid neutralizer; 0.1 to 0.5 percent of an organic bismuth catalyst; 10 to 15% of acetone; and the balance of water. According to the waterborne polyurethane material provided by the invention, acrylate polyethylene glycol dopamine and hydroxyl-terminated polyvinylpyrrolidone are adopted in the raw materials, so that the hydrophilicity and lubricity of the waterborne polyurethane material can be effectively and synergistically improved, and the adhesion of the waterborne polyurethane material is reduced; and the anticoagulation performance of polyethylene glycol can be improved by using the anticoagulation effect of polyethylene glycol.

The invention discloses a polyurethane bonding layer resin material, which belongs to the field of high polymer material and structure bonding, and comprises 40-60 parts by mass of a prepolymer A which is obtained by reacting 4, 4 '-diphenylmethane diisocyanate with polyether polyol with the molecular weight of 1800-2200g / mol and the hydroxyl value of 55-65mgKOH / g in the absence of a metal catalyst, and the mass fraction of residual NCO is 3-7%; the hydroxyl-terminated chain extender B is a blend of 1, 4-butanediol and 1, 6-hexanediol, and the molar ratio of the 1, 4-butanediol to the 1, 6-hexanediol is (1.0: 1)-(2.0: 1); the aromatic block modifier C is formed by condensation polymerization of p-hydroxybenzoic acid and isophorone diisocyanate, and the content of aromatic rings in the aromatic block modifier C is 30%-50%; 3 to 8 parts of a fluorine-containing isocyanate modifier D; 1 to 5 parts of an anti-migration stable component E; and 2-6 parts of a crosslinking density regulator F. The adhesive provided by the invention has excellent damp-heat aging resistance, dimensional stability and solvent resistance, high bonding strength and stable interface bonding, and is suitable for long-term bonding application in a complex environment.

The invention discloses a synthesis method of dotenorad. The invention provides a preparation method of a compound B. The preparation method comprises the following step: reacting 3, 5-dichloro-4-hydroxybenzoic acid with a compound A to generate the compound B in an organic solvent under the action of a condensing agent. The preparation method provided by the invention is short in step, high in reaction yield, high in purity, low in three-waste generation amount, low in production cost and high in product quality, and is a green and environment-friendly preparation method. # imgabs0 #