32 results about "P-hydroxybenzoic acid" patented technology

The invention relates to the technical field of coatings, in particular to a graphene modified polyurethane coating with an electromagnetic shielding function. The coating is composed of deionized water, a graphene modified polyurethane emulsion, silver nanoparticles and an auxiliary agent, a synergistic modification system of hydroxylated graphene and p-hydroxybenzoic acid is introduced in a polyurethane prepolymerization stage, an organic-inorganic synergistic network with good interface compatibility is formed, the conductivity and electromagnetic shielding effect of the coating are remarkably improved through a formed compact conductive path, and meanwhile the flexibility and adhesive strength of polyurethane are kept. The coating is compact in structure, high in adhesive force, good in conductive continuity and excellent in electromagnetic shielding effect, and can be widely applied to the field of electromagnetic protection of electronic equipment shells, communication devices and aerospace equipment.

The invention discloses a high-temperature-resistant liquid crystal polymer substrate for ultrathin flexible display, which belongs to the technical field of flexible display and comprises a modified liquid crystal polymer and a functional additive dispersed in the modified liquid crystal polymer. The modified liquid crystal polymer is prepared by polymerizing a monomer composition, and is specifically prepared from 38 to 42 parts of p-hydroxybenzoic acid, 28 to 30 parts of 4, 4 '-biphenol, 5.6 to 6.0 parts of terephthalic acid, 4.4 to 5.0 parts of 2, 6-naphthalic acid, 2.7 to 3.3 parts of isophthalic acid, 9 to 11 parts of 2, 2-bis (3, 5-difluoro-4-hydroxyphenyl) hexafluoropropane, 4.5 to 5.5 parts of N, N'-dihydroxypyromellitic diamine, 9 to 11 parts of 9, 9-bis [4-(4-methoxycarbonyl phenoxy) phenyl] fluorene and 1, 2-bis (4-(4-methoxycarbonyl phenoxy) phenyl] fluorene. The component A is prepared from 5.5 to 6.5 parts of 1, 4-cyclohexanedimethanol; the functional additive comprises an azobenzene derivative, a hot acid generator and a hydrogen bond enhancer; through the synergistic effect of a specific monomer combination, a functional additive and an optimization process, the technical bottleneck that heat resistance, transparency, dimensional stability and flexibility of an existing material are difficult to consider at the same time is broken through.

The invention relates to the technical field of catalysts, in particular to a preparation method of an iron-cobalt oxide and Beta molecular sieve composite catalyst and application of the iron-cobalt oxide and Beta molecular sieve composite catalyst to demethoxylation of lignin derivative vanillic acid. Meanwhile, due to the interaction of iron and cobalt species, the acid site of the catalyst is enhanced, and adsorption and activation of a substrate are facilitated; the iron-cobalt oxide is combined with the Beta molecular sieve, and the reaction activity of demethoxylation is improved through cooperation of metal / zeolite; the Co0 / Fe0. 04Co0. 96O-Beta composite catalyst is used for a vanillic acid demethoxylation catalytic reaction, the reaction is performed for 2 hours under the condition of 0.4 MPa H2 and 0.4 MPa CO2, the substrate conversion rate reaches 96.07%, the p-hydroxybenzoic acid selectivity reaches 86.96%, and the target product yield is 83.54%.

The invention discloses high-performance LCP (Liquid Crystal Polymer) resin and a preparation method thereof, and relates to the technical field of LCP resin. According to the preparation method, p-hydroxybenzoic acid, p-tert-butylcatechol and 5-vinyl isophthalic acid are taken as key monomers, LCP base resin with a side chain containing double bonds and tert-butyl is synthesized, then the LCP base resin and alkenyl-terminated polyarylester are subjected to melt extrusion, and the high-performance LCP resin is prepared. According to the present invention, the polyarylester and the alkenyl-terminated polyarylester form the micro-cross-linked structure during the processing, such that the excessive orientation of the molecular chain is effectively inhibited, the anisotropy is reduced, the melt strength and the processability are significantly improved, and the obtained resin has characteristics of high mechanical property and improved toughness, and is especially suitable for preparing the high-performance LCP material.

This invention discloses an ABS surface scratch repair coating and its preparation method, relating to the field of coating technology. The ABS surface scratch repair coating is prepared by reacting 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide with formic acid to obtain intermediate 1; reacting intermediate 1 with diethyl maleate to obtain intermediate 2; reacting intermediate 2 with ethylenediamine to obtain a polyamino phosphorus-containing curing agent; reacting p-hydroxybenzoic acid with 2-chlorocyclopentanone to obtain cyclopentanone benzoate; reacting nano-cerium dioxide sequentially with 3-chloropropyltrimethoxysilane and cyclopentanone benzoate to obtain modified nano-cerium dioxide; and mixing epoxy resin, polyamino phosphorus-containing curing agent, puerarin, and modified nano-cerium dioxide with acetone as a diluent to obtain the ABS surface scratch repair coating. The ABS surface scratch repair coating prepared by this invention has superior weather resistance and flame retardant properties.

The invention relates to the technical field of high-performance polymer fiber manufacturing, in particular to a low-processing-viscosity liquid crystal polyarylester fiber and a preparation method thereof.The preparation method comprises the steps that S1, p-hydroxybenzoic acid and 2-hydroxy-6-naphthoic acid serve as monomers, and an acetylation reaction is conducted in the presence of an acetylation reagent and a catalyst; the preparation method comprises the following steps: firstly, preparing LCP resin, then carrying out melt polycondensation reaction, adding 6-acetoxy-2-naphthoic acid at the later stage of the melt polycondensation reaction, stirring and dispersing, discharging, cooling and granulating to obtain the LCP resin; and S2, carrying out melt spinning and heat treatment on the LCP resin to obtain the liquid crystal polyarylate fiber. According to the preparation method, the melt processing viscosity of the resin can be remarkably reduced, the production smoothness is improved, the heat treatment time is shortened, the production energy consumption is reduced, the high molecular weight potential of the resin in spinning processing is not influenced, and the liquid crystal polyarylate fiber is ensured to have very good strength performance.

This invention discloses a methane inhibitor based on plant functional components and its application. The inhibitor, by mass fraction (100%), comprises the following raw materials: 1.5-6% p-hydroxybenzoic acid, 0.4-2.4% astragaloside, 5-40% polyethylene glycol 4000, and 81.6-99.999% bentonite. The methane inhibitor provided by this invention uses p-hydroxybenzoic acid and astragaloside as active ingredients. Through their synergistic effect, it effectively inhibits the activity of methanogenic bacteria and the methane production pathway in the rumen of ruminants, while simultaneously improving the rumen fermentation pattern. The above-mentioned methane inhibitor uses natural plant-derived active ingredients, is safe, non-toxic, environmentally friendly, and has a simple preparation process suitable for large-scale production.

The present invention relates to the technical field of polymer materials, and in particular to a spinning-grade wholly aromatic polynaphthoate resin and a preparation method therefor. In the present invention, p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, an aromatic dicarboxylic acid, and an ethylene glycol monomer are used as starting materials and are polymerized under the action of a catalyst. Under specific reaction conditions, a spinning-grade wholly aromatic polynaphthoate resin is successfully obtained. The spinning-grade wholly aromatic polynaphthoate resin has high molecular weight, low impurity content, good heat resistance and good melt fluidity, exhibits a more pronounced shear thinning behavior, and can be directly used for the preparation of polynaphthoate fibers.

The invention belongs to the technical field of preparation of organic compounds, and particularly discloses a preparation method of polymer-grade p-hydroxybenzoic acid. Comprising the following steps: preparing a potassium phenolate and metal composite salt, performing carboxylation reaction, performing decolorization treatment, performing acidification purification and the like: performing dehydration treatment on phenol, potassium hydroxide, potassium carbonate and formate under the action of a metal catalyst to obtain the potassium phenolate and metal composite salt; continuously introducing carbon monoxide or mixed gas of carbon monoxide and carbon dioxide to carry out carboxylation reaction, and adding water to dissolve to obtain a p-hydroxybenzoic acid dipotassium salt solution; and after decolorizing with activated carbon, separating potassium sulfate and a target product through two times of acidification to obtain the polymer-grade p-hydroxybenzoic acid. Through combination of carbon monoxide or carbon monoxide and carbon dioxide and screening of the catalyst, the one-time carboxylation conversion rate is increased to 90% or above, the product yield reaches up to 85%, the purity is larger than or equal to 99.96%, the chromaticity is stabilized at 8 Hazen, purification is simple, the emission of three wastes is remarkably reduced, and large-scale production of the polymer-grade p-hydroxybenzoic acid is achieved.

This invention relates to the field of polymer molding materials. A functional color-printed composite packaging film of ultra-high molecular weight polyethylene is disclosed, which is formed by curing a polyethylene film substrate, p-hydroxybenzoic acid, polyethylene glycol diacrylate, laccase, and acrylate ink monomers. The film is formed by covalently coupling quinone radicals generated from p-hydroxybenzoic acid and polyethylene glycol diacrylate under laccase catalysis to the substrate surface, forming a polyethylene glycol grafted interlayer. Subsequently, ultraviolet light-initiated polymerization is performed on the surface of the interlayer to form a cross-linked and cured ink layer. This method utilizes the covalently bonded grafted interlayer to block the rearrangement of non-polar molecular chains of the substrate to the surface, maintaining surface polarity stability, and enabling the ink layer and substrate to possess the highest standard peel strength, with no blistering or peeling of the ink layer under boiling water conditions.

The invention provides a complex microbial inoculant for efficiently degrading p-hydroxybenzoic acid in soil, the complex microbial inoculant comprises a compost bacillus Sys-Gs-008 strain and a bacillus licheniformis Sys-Gs-011 strain, the preservation number of the compost bacillus Sys-Gs-008 strain is CCTCC (China Center for Type Culture Collection) NO: M20252817, and the preservation number of the bacillus licheniformis Sys-Gs-011 strain is CCTCC NO: M20252820. The complex microbial inoculant provided by the invention can efficiently degrade the main phenolic acid allelochemical-p-hydroxybenzoic acid produced by ginseng, and the two strains in the complex microbial inoculant are non-ginseng pathogenic strains and have no antagonism between each other, so that the complex microbial inoculant can be applied to preparation of a ginseng allelochemical-p-hydroxybenzoic acid degradation microbial inoculant, and has a wide application prospect. The continuous cropping obstacle of the ginseng is greatly improved, and the method has a good application prospect in the field of ginseng planting.

The invention provides high-temperature-resistant anti-rust oil as well as a preparation method and application thereof. The high-temperature-resistant anti-rust oil comprises the following components in parts by weight: 65-80 parts of base oil, 2-6 parts of an anti-rust agent, 1-5 parts of an antioxidant, 1-4 parts of a corrosion inhibitor, 0.5-2 parts of a film-forming agent and 0.05-0.85 part of a high-temperature stabilizer, the high-temperature stabilizer is formed by mixing montmorillonite and an N-containing nano material, and the N-containing nano material is prepared by reacting 3, 5-diamino-4-chlorobenzenesulfonic acid with p-hydroxybenzoic acid. The high-temperature-resistant anti-rust oil provided by the invention has excellent anti-rust performance and high-temperature stability.

The invention relates to the technical field of traction ropes, in particular to a production method of a strong yarn traction rope, which comprises the following steps: S1, raw material preparation, S2, filler preparation, S3, raw material pretreatment, S4, blending treatment, S5, twisting treatment, S6, stranding treatment, and S7, curing and weaving treatment. According to the invention, the filler takes polyhedral oligomeric silsesquioxane as a rigid skeleton, the cage structure of the polyhedral oligomeric silsesquioxane provides dimensional stability, the epoxy-terminated hyperbranched polyester is firmly combined with a polyester matrix through active functional groups of the epoxy-terminated hyperbranched polyester, and the carbon nanohorns and the boron nitride nanosheets are used as nanoscale reinforcements, so that the interface contact area is effectively increased; under the synergistic effect of bridging of p-hydroxybenzoic acid and addition materials, the components are firmly combined with a polyethylene glycol terephthalate matrix in a multi-layer mode, stress can be effectively transmitted and dispersed through strong interface combination, and early material damage caused by interface weakness and stress concentration is eliminated.

This invention relates to a method for degrading p-hydroxybenzoic acid (p-hydroxybenzoic acid), a degrading microbial agent, and its applications. The microbial agent is a fermentation broth or cell preparation of Acinetobacter JS-1. The degradation method involves inoculating Acinetobacter JS-1 into a culture medium containing p-hydroxybenzoic acid for fermentation, thereby degrading p-hydroxybenzoic acid. This method achieves a 97% degradation rate of 0.75 g / L p-hydroxybenzoic acid within 12 hours and almost completely degrades 1.5 g / L p-hydroxybenzoic acid within 48 hours, demonstrating high degradation efficiency. This microbial agent can be used to degrade p-hydroxybenzoic acid in soil and promote plant growth. Using potted cucumbers as experimental subjects, application of the microbial agent effectively alleviated the autotoxicity of cucumbers, increasing the aboveground plant height by approximately 34.8% and the underground root length by approximately 31.9%. This has significant value in alleviating continuous cropping obstacles caused by p-hydroxybenzoic acid and improving the soil environment.

The application discloses a HPLC fingerprint spectrum establishing and content determination method of Zha Dihu, and belongs to the technical field of drug chemical component analysis. The application establishes a HPLC fingerprint spectrum, confirms that six common peaks in test sample solutions of 14 batches are p-hydroxybenzoic acid, vanillic acid, p-hydroxybenzaldehyde, shatavari glycoside, paeoniflorin and p-hydroxycinnamic acid, adopts SPSS 27 and SIMCA14.1 analysis software, carries out cluster analysis, principal component analysis and orthogonal partial least square discriminant analysis on peak areas of the six identified common peaks in the fingerprint spectrum of the Zha Dihu medicinal materials of the 14 batches, and carries out main component content determination. The chemical component composition of the Zha Dihu is determined, the characteristic components are revealed, and the main components are quantitatively analyzed, so as to provide a scientific basis for quality evaluation, efficacy research and subsequent development and utilization of the Zha Dihu.

The application discloses a preparation method of 3-amino-4-methoxy-N-phenyl benzamide. The method comprises the following steps: taking p-hydroxybenzoic acid as raw material, carrying out amidation reaction, diazotization and reduction reaction to obtain 3-amino-4-hydroxy-N-phenyl benzamide intermediate, and finally carrying out methylation reaction to obtain 3-amino-4-methoxy-N-phenyl benzamide. The solid product of 3-amino-4-methoxy-N-phenyl benzamide obtained by the preparation method has a purity greater than 97%, the overall step operation is simple under the premise of obtaining high yield, three waste emissions are reduced, and the method is more suitable for industrial production.

The invention belongs to the field of microorganisms, and particularly relates to a complex microbial inoculant for overcoming continuous cropping obstacles of pinellia ternate and application of the complex microbial inoculant. The active ingredients of the composite bacterial agent are composed of sphingomonas kungheensis JN21 (CGMCC (China General Microbiological Culture Collection Center) No. 36292) and bacillus fruticosa F16 (CGMCC No. 36291), and the active ingredients of the composite bacterial agent are composed of sphingomonas kungheensis JN21 (CGMCC No. 36292) and bacillus fruticosa F16 (CGMCC No. 36291). The two strains can effectively degrade the key continuous cropping autotoxic substance p-hydroxybenzoic acid of pinellia ternate. When the complex microbial inoculant is applied to continuous cropping soil of pinellia ternate, the content of p-hydroxybenzoic acid in the soil is remarkably reduced, the circulation of carbon, nitrogen and sulfur in the soil is promoted, and particularly, the abundance of hydrogen sulfide generation pathway genes is promoted, so that continuous cropping obstacles of pinellia ternate are relieved or prevented. The invention provides an effective microbial solution for solving the continuous cropping obstacle problem of pinellia ternate.

This invention provides a method for determining the content of lotus root nodes and related processed products by HPLC, comprising: A) dissolving and extracting the test sample raw material in a solvent to obtain a test solution; the test sample raw material includes lotus root nodes or related processed products; B) determining the test solution by high-performance liquid chromatography to obtain an HPLC chromatogram of the lotus root nodes or related processed products; the chromatographic conditions of the high-performance liquid chromatography are: a C18 column; mobile phase A is a methanol solution, mobile phase B is a 0.5% phosphoric acid aqueous solution, and gradient elution is performed; the gradient elution is specifically as follows: 0-1 min, phase A: 2%, phase B: 98%; 1-4 min, phase A... Phase A: 2% → 8%, Phase B: 98% → 92%; 4–6 min, Phase A: 8% → 0%, Phase B: 92% → 100%; 6–16 min, Phase A: 0%, Phase B: 100%; 16–30 min, Phase A: 10%, Phase B: 90%. This invention employs high-performance liquid chromatography (HPLC) with a methanol-0.5% phosphoric acid solution as the mobile phase for gradient elution. Using protocatechuic acid and p-hydroxybenzoic acid as reference standards, an HPLC method for determining the content of lotus root nodes and related processed products was established, providing more scientific technical means for controlling the medicinal quality of lotus root nodes and related processed products.

The invention discloses a mutant of a p-hydroxybenzoic acid efflux pump subunit AaeB and application of the mutant in preparation of L-threonine, and belongs to the technical field of genetic engineering. The technical problem to be solved by the invention is how to improve the yield of L-threonine. On the basis, the invention provides a mutant of p-hydroxybenzoic acid efflux pump subunit AaeB and application of the mutant in preparation of L-threonine, and the mutant of p-hydroxybenzoic acid efflux pump subunit AaeB is a protein with an amino acid sequence comprising SEQ ID NO: 5. The method can be used for improving the yield of the L-threonine of the Escherichia coli.

The invention belongs to the technical field of chemical synthesis of drugs, and particularly discloses a novel synthetic route of an anti-hyperuricemia drug dotinirad (Dotinirad, the CAS number is 1285572-51-1, and the chemical name is 3-(3, 5-dichloro-4-hydroxybenzoyl)-1, 1-dioxo-2, 3-dihydro-1, 3-benzothiazole). The invention further discloses a preparation method of the dotinirad, the CAS number is 1285572-51-1, and the chemical name is 3-(3, 5-dichloro-4-hydroxybenzoyl)-1, 1-dioxo-2, 3-dihydro-1, 3-benzothiazole. According to the route, p-hydroxybenzoic acid which is low in price and easy to obtain serves as a starting raw material, a target product is obtained through four-step reaction of chlorination, acylating chlorination, amide condensation and oxidation, the method has the advantages of being short in step, mild in condition and high in yield, use of 2-aminothiophenol which is odorous and unstable is avoided, benzothiazole which is more stable and low in price is used as a raw material, and the method is suitable for industrial production. The concept of green chemistry is met. The industrial production cost is remarkably reduced, and an efficient and reliable technical scheme is provided for large-scale production of the dotenorad.

The invention discloses a method for improving yield of protocatechuic acid of mycelia and a recombinant strain obtained by the method. The method comprises the step of carrying out genetic manipulation on mycelia cells to delete or reduce the activity of specific genes so as to improve the protocatechuic acid production capacity of the mycelia cells. In a specific experiment, on the basis of transcriptome sequencing and homologous sequence comparison, key utilization pathway genes MYCTH52082 and MYCTH2298914 for hydroxybenzoic acid of the thermophilic mycelia are excavated, the thermophilic mycelia gene MYCTH52082 is knocked out by utilizing a CRISPR-Cas9 editing technology or the MYCTH52082 and the MYCTH2298914 are knocked out in a combined manner, a gene editing deletion mutant strain is obtained, and the mutant strain is used for detecting the thermophilic mycelia. The mutant strain can significantly improve the production level of protocatechuic acid, the molar conversion rate is 93.2% when p-hydroxybenzoic acid is used as a substrate, and the mutant strain has great application value.

This invention discloses a bacterium that degrades autotoxic substances and its applications. The specific bacterium providing this invention is *Pseudomonas plecoglossicida*, strain number 56-21, with accession number CGMCC No. 26763 at the China General Microbiological Culture Collection Center. *Pseudomonas plecoglossicida* 56-21 (CGMCC No. 26763) provided by this invention can utilize p-hydroxybenzoic acid or vanillin as the sole carbon source for growth and can degrade autotoxic substances such as p-hydroxybenzoic acid or vanillin, which is of great significance for alleviating continuous cropping obstacles and improving the soil environment.

The invention belongs to the technical field of preparation of organic compounds, and particularly discloses a method for catalytically synthesizing methylparaben by a co-catalysis system, which adopts the co-catalysis system consisting of concentrated sulfuric acid and an auxiliary catalyst to catalyze an esterification reaction of p-hydroxybenzoic acid and methanol. Wherein the dosage of the concentrated sulfuric acid is equal to the mass of the p-hydroxybenzoic acid, the dosage of the auxiliary catalyst is equal to the mass of the p-hydroxybenzoic acid, reacting for 2-4 hours under reflux and stirring conditions, recovering methanol, neutralizing alkaline water, filtering and recrystallizing to obtain a methylparaben product. Through the synergistic effect of a co-catalysis system, the dosage of concentrated sulfuric acid is greatly reduced, the reaction time is shortened to 2-4 hours, the conversion rate of p-hydroxybenzoic acid can reach 99% or above, the highest yield of methylparaben after recrystallization reaches 96.21%, and the method is small in equipment corrosion, simple in post-treatment, low in cost and suitable for industrial large-scale production.

The invention relates to the technical field of bio-based high polymer materials, and particularly discloses a preparation method of a bio-based modified polyurethane material. The method for preparing the bio-based modified polyurethane material comprises the following steps: dissolving castor oil, polycaprolactone glycol and isosorbide in N, N-dimethylformamide; adding a proper amount of isophorone diisocyanate and a catalyst into the system, and carrying out prepolymerization reaction; then adding hexahydro-1, 3, 5-tris (hydroxyethyl)-s-triazine into the system to carry out a chain extension reaction, and then sequentially adding a certain amount of p-hydroxybenzoic acid, furfuryl amine and 3-aminopropyltriethoxymethylsilane to carry out an end capping reaction; and finally, defoaming and curing to obtain the bio-based modified polyurethane material. Through the synergistic effect of the two end-capping reagents, the strength and toughness of the polyurethane material are synergistically increased.

The invention relates to aromatic liquid crystal polyester resin, a preparation method thereof and a composite liquid crystal polymer material. The aromatic liquid crystal polyester resin is prepared from the following raw materials in parts by mole: 55 to 65 parts of p-hydroxybenzoic acid, 1 to 3 parts of 2-hydroxy-6-naphthoic acid, 14 to 16 parts of diphenol, 17 to 21 parts of phthalic acid and 3 to 5 parts of acetaminophen. The aromatic liquid crystal polyester resin has high mechanical strength, high fluidity, good toughness and high thermal deformation temperature, so that the aromatic liquid crystal polyester resin can be used for manufacturing precise electronic parts such as electronic connectors and the like, and can be well suitable for surface assembly technologies such as reflow soldering and the like.

This invention discloses a high-temperature resistant liquid crystal polymer substrate for ultra-thin flexible displays, belonging to the field of flexible display technology. The substrate of this invention comprises a modified liquid crystal polymer and functional additives dispersed therein. The modified liquid crystal polymer is polymerized from a monomer composition, specifically consisting of 38-42 parts of p-hydroxybenzoic acid, 28-30 parts of 4,4'-biphenylhydrazine, 5.6-6.0 parts of terephthalic acid, 4.4-5.0 parts of 2,6-naphthalenedicarboxylic acid, 2.7-3.3 parts of isophthalic acid, and 2,2-bis(3,5-difluoro-4-hydroxybenzene). The composition comprises 9-11 parts of hexafluoropropane, 4.5-5.5 parts of N,N'-dihydroxypyromellitic acid diamine, 9-11 parts of 9,9-bis[4-(4-methoxycarbonylphenoxy)phenyl]fluorene, and 5.5-6.5 parts of 1,4-cyclohexanediethanol; the functional additives include azobenzene derivatives, thermal acid generators, and hydrogen bond enhancers; the present invention overcomes the technical bottleneck of existing materials in achieving a balance between heat resistance, transparency, dimensional stability, and flexibility through the synergistic effect of specific monomer combinations, functional additives, and optimized processes.

This invention relates to a type of Bacillus safranin (Sarfus). Bacillus safensis HMC19, with accession number CGMCC No. 35493, can stably colonize in high saline-alkali environments, regulate soil pH, and secrete the plant growth regulator phenylacetic acid, which delays chlorophyll degradation and effectively alleviates premature aging of plants under saline-alkali stress. It achieves synergistic effects of saline-alkali land improvement and crop quality and yield enhancement. It can also effectively degrade soil autotoxic substances such as p-hydroxybenzoic acid and ferulic acid, improve the soil microenvironment, and prevent continuous cropping obstacles.

The application belongs to the field of high-frequency communication materials, and specifically discloses a Low-alpha ray spherical alumina / liquid crystal polymer 5G base station substrate material, which is characterized by containing a liquid crystal copolymer matrix and Ce 3+ doped spherical alumina fillers; the liquid crystal copolymer matrix comprises 60-68 mol% of p-hydroxybenzoic acid, 20-24 mol% of 5,5'-dithiobis(2-nitrobenzoic acid) and 12-16 mol% of 4-(5-amino-6-hydroxy-2-benzoxazolyl)-benzoic acid three kinds of comonomers; the Ce 3+ doped spherical alumina fillers are sequentially coated with Bi2Te 3‑x Se x topological insulating layer and phosphate silane grafting layer, wherein x=0.12-0.18. The Low-alpha ray spherical alumina / liquid crystal polymer 5G base station substrate material of the application has an alpha ray shielding rate of greater than or equal to 99.95%, a thermal conductivity of greater than or equal to 3.35 W / mK, and a dielectric loss factor tan delta of less than 0.00014 at 28 GHz, and can meet the high-frequency, high-reliability and other stringent requirements for the substrate in 5G millimeter wave antenna applications.

The purpose of the present invention is to provide a method for producing hydroquinone that involves an enzyme that can convert p-hydroxybenzoic acid into hydroquinone at higher efficiencies than the 4-hydroxybenzoate 1-hydroxylase possessed by Candida parapsilosis strain CBS604. This purpose is achieved, for example, by a method for producing hydroquinone, the method comprising a step for obtaining hydroquinone by reacting p-hydroxybenzoic acid with a 4-hydroxybenzoate 1-hydroxylase derived from Spathaspora passalidarum.

The invention relates to the technical field of multifunctional lubricants, and discloses a zinc stearate lubricant composition for polyvinyl chloride processing and a preparation process thereof, specifically, trialkyl citrate, p-hydroxybenzoic acid, mercaptoethylamine and paraformaldehyde are taken as raw materials, esterification reaction and Mannich condensation reaction are carried out, and the zinc stearate lubricant composition for polyvinyl chloride processing is obtained. The thiolated benzoxazine type citric acid trialkyl ester is prepared by adding the thiolated benzoxazine type citric acid trialkyl ester; the preparation method comprises the following steps: based on a substitution reaction mechanism, preparing functionalized chlorinated paraffin by taking thiolated benzoxazine trialkyl citrate and chlorinated paraffin as raw materials; the functional chlorinated paraffin and zinc stearate are premixed, and the zinc stearate lubricant composition is prepared through an extrusion granulation process. The zinc stearate lubricant composition prepared by the invention is used as a raw material in polyvinyl chloride processing, so that a polyvinyl chloride product prepared from the zinc stearate lubricant composition has the beneficial technical effects that the lubricating property, the plasticizing effect and the thermal stability are remarkably improved.