277 results about "Hexamethylenediamine" patented technology

The invention discloses a biosynthesis system for high-yield 1, 6-hexamethylenediamine and application of the biosynthesis system, and belongs to the technical field of biology. According to the method, key genes which are excavated and optimized in a 1, 6-hexamethylenediamine biosynthetic pathway are co-expressed in a single cell module or a multi-cell module, and different enzyme elements expressed by the cell module are subjected to enzyme cascade reaction, so that 1, 6-hexamethylenediamine can be efficiently synthesized by taking caprolactam or 6-aminocaproic acid as a substrate; furthermore, after the carboxylic acid reductase MaCAR is mutated, the catalytic activity of the carboxylic acid reductase MaCAR can be remarkably improved, and the yield of the 1, 6-hexamethylenediamine is further improved; in addition, the biosynthesis system disclosed by the invention directly takes the cell module as a whole-cell catalyst, and an enzyme purification step is avoided, so that the biosynthesis system has the advantage of low cost.

The invention discloses a flame-retardant high-temperature-resistant fiber and a preparation method thereof, and relates to the technical field of fibers. When the flame-retardant high-temperature-resistant fiber is prepared, 1, 6-hexamethylenediamine, 1, 6-adipic acid, tetrahydrodifuran [3, 4-B: 3 ', 4'-D] furantetraone and a phosphorus-sulfur composite flame retardant are copolymerized to generate a polyamide-polyamide acid solution; 4-aminopyridine and the polyamide-polyamide acid solution are subjected to a reaction, and modified polyamide is prepared; the modified polyamide is subjected to melt spinning, and polyamide fibers are prepared; the preparation method comprises the following steps: pretreating nano titanium dioxide by using 4-bromobutyl trimethoxy silane to prepare modified nano titanium dioxide; mixing the modified nano titanium dioxide and ethanol to prepare a light-resistant antibacterial finishing agent; and carrying out post-treatment on the polyamide fiber by using an anti-light antibacterial finishing agent to prepare the flame-retardant and high-temperature-resistant fiber. The prepared fiber is excellent in comprehensive performance, particularly outstanding in flame retardance and high temperature resistance, and suitable for the fields of special protective clothing, high-temperature filtering materials and the like.

The invention discloses a catalyst for preparing ultrahigh molecular weight polyoxyethylene as well as a preparation method and application thereof, and relates to the technical field of catalyst preparation. The preparation method of the catalyst comprises the following steps: S1, carrying out a reaction on 6-hexamethylenediamine and allyl acrylate to generate an intermediate 1, S2, carrying out a reaction on the intermediate 1 and diphenylphosphine to generate an intermediate 2, S3, carrying out a reaction on the intermediate 2 and allyl bromide to generate an intermediate 3, and S4, carrying out a reaction on the intermediate 3 and 9-boron bicyclo [3.3. 1] nonane. The prepared catalyst is high in catalytic activity, ultrahigh molecular weight polyoxyethylene can be prepared, and the molecular weight distribution of the prepared ultrahigh molecular weight polyoxyethylene is narrow.

The invention relates to the technical field of precious metal recovery, in particular to a process for separating precious metal from copper-nickel smelting waste, which comprises the following steps: crushing and grading the waste, adding a sulfuric acid solution containing etidronic acid, leaching, and washing, drying and crushing filter residues to obtain a pretreated material; mixing the pretreated material with a sodium peroxide-sodium carbonate composite flux, roasting, leaching with water, and filtering to obtain a filter residue B; adding a leaching agent containing hydrochloric acid, sodium chlorate and 1, 2-cyclohexanediamine tetraacetic acid into the filter residue B according to the ratio of 1: 3-1: 5, and filtering to obtain filtrate C and filter residue C; adjusting the pH value of the filtrate C to 1.5-2.5, adding an ethanol solution of sodium N, N-diethyldithiocarbamate, precipitating, washing and calcining to obtain sponge palladium; adding ammonium chloride into the filtrate D, precipitating and calcining to obtain sponge platinum; and leaching the filter residue C by using a hydrochloric acid-chloroauric acid mixed solution containing diphenylthiourea, and replacing and calcining zinc powder to obtain crude gold. According to the process, the leaching rates of platinum, palladium and gold and the product purity are greatly improved; flux and reagent systems are optimized, consumption and energy consumption are reduced, waste liquid treatment is matched for up-to-standard discharge, and efficient resource recovery and environment-friendly cooperation are achieved.

The invention discloses a thermal antistatic fabric based on polyamide fibers and a preparation method thereof, and relates to the technical field of textile fibers. When the thermal antistatic fabric based on the polyamide fiber is prepared, caprolactam, a flame retardant and hexamethylenediamine react to prepare pre-modified polyamide; the pre-modified chinlon and 3-chloro-1-propanethiol are subjected to a reaction, and modified chinlon is prepared; the preparation method comprises the following steps: sequentially reacting graphene oxide with mercaptopropyltrimethoxysilane and 2-(2H-benzotriazole-2-yl)-4-methyl-6-(2-propenyl) phenol, so as to obtain modified graphene oxide; the modified chinlon and the modified graphene oxide are mixed and then subjected to melt spinning, and modified chinlon fibers are obtained; and twisting the modified polyamide fiber, spinning, and post-processing to obtain the thermal antibacterial fabric based on the polyamide fiber. The warm-keeping antistatic fabric based on the polyamide fiber has good warm-keeping, antistatic, flame-retardant, anti-aging and mechanical properties.

The invention discloses clethodim diamine salt as well as a preparation method and application thereof. The stability of the clethodim diamine salt (clethodim 1, 4-butanediamine salt, clethodim 1, 5-pentanediamine salt and clethodim 1, 6-hexamethylenediamine salt) provided by the invention is superior to that of clethodim and clethodim monoamine salt (such as clethodim tert-butylamine salt); meanwhile, the herbicidal activity of the clethodim diamine salt (clethodim ethylenediamine salt, clethodim 1, 4-butanediamine salt and clethodim 1, 5-pentanediamine salt) is superior to that of clethodim tert-butylamine salt, and the herbicidal activity of the clethodim 1, 5-pentanediamine salt is superior to that of clethodim. Most clethodim diamine salt is low in degradation rate in the high-temperature heat storage process and easier to store for a long time, the clethodim diamine salt is higher in melting point than clethodim monoamine salt (such as clethodim tert-butylamine salt), granulation and smashing are more convenient, the clethodim diamine salt can be used as a herbicide to be processed into solid dosage forms such as water dispersible granules and the like, the physical performance of the preparation is better, and the preparation has good application prospects. The commercialization prospect is good.

The invention relates to the field of pipeline materials, and discloses a halogen-free flame-retardant MPP power pipeline material and a preparation method thereof.The pipeline material comprises polypropylene, modified multi-walled carbon nanotubes, a coating filler, a compatilizer and a lubricant; the modified multi-walled carbon nanotube is prepared by carrying out acylating chlorination on an oxidized multi-walled carbon nanotube by using thionyl chloride and then reacting with an aminated cyclotriphosphazene derivative; according to the aminated cyclotriphosphazene derivative, phosphonitrilic chloride trimer and 3, 5-di-tert-butyl-4-hydroxybenzylamine react to prepare a cyclotriphosphazene intermediate, the cyclotriphosphazene intermediate and N, N '-bis-(2, 2, 6, 6-tetramethyl-4-piperidyl)-1, 6-hexamethylenediamine are subjected to substitution to prepare a cyclotriphosphazene derivative, and then the cyclotriphosphazene derivative and 1, 6-hexamethylenediamine are subjected to substitution to obtain the aminated cyclotriphosphazene derivative. The coating filler is prepared by preparing modified lignin by combining 2, 2, 6, 6-tetramethyl-4-piperidinol and lignin and then preparing silicon dioxide-coated modified lignin by adopting a sol-gel method, and the pipe prepared by the invention has excellent mechanical properties, flame retardance, thermo-oxidative aging resistance and ultraviolet aging resistance.

The invention provides an adsorption material and a preparation method and application thereof, the adsorption material comprises a carrier and an endotoxin affinity binding ligand, the endotoxin affinity binding ligand comprises a recombinant C factor protein, and the carrier and the recombinant C factor protein are connected through a spacer arm; wherein the carrier comprises at least one of resin, chitosan, cellulose, agarose and glucan; the spacer arm comprises at least one of modified polyethylene glycol, polyvinyl pyrrolidone, polymethylacrylic acid-2-hydroxyethyl ester, polyvinyl alcohol, polyacrylic acid, hexamethylenediamine, divinyl sulfone and glutaraldehyde, and at least one end of the modified polyethylene glycol is provided with carboxyl, aldehyde or amino. The adsorption material provided by the invention can efficiently adsorb endotoxin, has the characteristics of low toxicity risk and excellent blood compatibility, and can improve the safety of blood purification.

The application provides a hindered amine light stabilizer and a preparation method thereof, and the preparation method comprises the following steps: putting N, N-bis(2, 2, 6, 6-tetramethyl-4-piperidyl) 1, 6-hexanediamine and an organic solvent into a reaction bottle, heating to 50-80 DEG C, adding methyl acrylate into the system dropwise, obtaining an intermediate I through an addition reaction, and then obtaining a crude product through an ester exchange reaction of the intermediate I and tetramethylpiperidinol in the presence of a catalyst and an organic solvent, washing with water, decoloring, filtering, cooling and crystallizing, filtering and drying to obtain the product; the light stabilizer obtained by the application has multiple hindered amine functional groups, has good heat resistance and extraction resistance, and has good compatibility with resin.

The invention relates to a composite aerogel for water treatment and a preparation method thereof, and the preparation method comprises the following steps: activating graphene oxide, and then carrying out amidation reaction on the activated graphene oxide, aminated beta-cyclodextrin and hexamethylenediamine to obtain modified graphene; then carrying out hydrothermal reaction on the GO / BiOCOOH composite material, a Bi < 3 + > solution and formamide to obtain a modified GO / BiOCOOH composite material; crosslinking in a lignin aqueous solution to obtain hydrogel; and finally, performing supercritical drying to obtain the composite aerogel. The preparation method has the beneficial effects that by constructing macroscopic blocky aerogel, the problems that a powder material is easy to lose and difficult to recycle are effectively solved; the high photocatalytic activity is still kept under the condition that iodine doping is not used, and the possibility of secondary pollution of free iodine to a water body due to instability of the material is reduced; under the synergistic effect of the aerogel and the photocatalytic reaction, the efficient proceeding of the adsorption and desorption-photocatalytic reaction is realized; the material is high in stability, easy to recover, capable of being recycled through simple desorption, high in cycle index and long in service life.

The invention relates to a low-expansion moisture-resistant electronic component packaging resin adhesive and a preparation method thereof, and belongs to the technical field of high polymer materials. The resin adhesive comprises the following components: modified resin, phenyl methyl organic silicon resin, epoxy vinyl resin, a dynamic functional curing agent, a microencapsulated dicyandiamide curing agent, perfluorooctyltriethoxysilane, functional filler and the like; the modified resin is obtained by modifying hydrogenated bisphenol A epoxy resin with hydrogen-terminated polydimethylsiloxane and trimethylsiloxy silicate ester, adding a silane coupling agent and mixing; the dynamic function curing agent is obtained by reacting hexamethylenediamine and intermediate powder obtained by reacting 2, 3-dihydroxy benzaldehyde with pinacol borane; the functional filler comprises silicon dioxide and boron nitride which are subjected to surface treatment by a silane coupling agent. The low-expansion and high-moisture-resistance electronic component packaging resin adhesive is prepared from the components according to a specific ratio and a specific method, the components have a synergistic effect and play advantages, and the packaging reliability and the service life of an electronic component are guaranteed.

The invention relates to the technical field of high polymer materials, and particularly discloses modified polyamide, an acid dyeable nylon 66 fiber as well as a preparation method and application of the acid dyeable nylon 66 fiber. The acid dyeable nylon 66 fiber disclosed by the invention has in-situ leveling property, modified monomers, adipic acid and hexamethylenediamine are polymerized to obtain modified polyamide, then the modified polyamide is prepared into pre-oriented yarns, and the pre-oriented yarns are elasticized to obtain the acid dyeable nylon 66 fiber. The ionic group of the modified monomer has an in-situ retarding effect in the nylon 66 fiber and is not combined with a dyeing seat, and an excellent level dyeing effect and a high dye uptake can be obtained without using a leveling agent. The addition amount of the modified monomer is small, the molecular size of the modified monomer is similar to that of adipic acid and hexamethylenediamine monomers, adverse effects on a polymerization process and a nylon 66 molecular structure are small, and the prepared acid dyeable nylon 66 fiber has excellent mechanical properties. The preparation cost of the acid dyeable nylon 66 fiber is low, the process is simple and convenient, and the acid dyeable nylon 66 fiber has a wide application prospect.

The present invention discloses a method for preparing hexamethylenediamine, the method comprising the following steps: (1) subjecting hexanediol and ammonia to an ammonia reaction under ammonia reaction conditions, optionally in the presence of a first solvent, to obtain an ammonia reaction product; (2) separating the ammonia reaction product from step (1) to obtain a hexamethylenediamine product and a heavy component; and (3) performing ammonia decomposition on the heavy component under ammonia decomposition reaction conditions to obtain an ammonia decomposition reaction product, and returning the ammonia decomposition reaction product to step (2). The present invention can not only improve the yield of hexamethylenediamine but also extend the service life of the catalyst.

The invention discloses a coumarin-based bio-based epoxy resin monomer and a preparation method and application thereof, and the structure of the monomer is DPE, DCE and DHE. The monomer takes dihydrocoumarin and biomass amine compounds (including putrescine, cadaverine and 1, 6-hexamethylenediamine) as raw materials, biomass bisphenol DP, DC and DH are prepared through a simple ring-opening reaction, and then the monomer is prepared through a glycidyl reaction. A bisamide structure is innovatively introduced into the epoxy resin monomer, so that the epoxy resin monomer has the advantages of simple and convenient synthesis process, high yield, easily available raw materials, good biological safety and the like, and the performance is superior to that of traditional petroleum-based epoxy resin. The bio-based epoxy resin prepared based on the monomer shows a novel molecular structure and excellent mechanical properties and heat resistance.

The invention discloses a polyimide-aluminum oxide composite film material and a preparation method thereof, the composite film material is composed of a polyimide layer and an aluminum oxide layer deposited and combined on the upper surface of the polyimide layer, and the thickness of the polyimide layer and the thickness of the aluminum oxide layer are both nanoscale; the composite film material is prepared by using atomic layer deposition equipment, and the preparation method comprises the following steps: firstly, depositing a nanoscale polyimide layer on a monocrystalline silicon piece carrier according to a set program by taking pyromellitic dianhydride and hexamethylenediamine as precursor raw materials; and depositing and combining a nanoscale aluminum oxide layer on the upper surface of the polyimide layer according to a set program by taking trimethylaluminum and distilled water as precursor raw materials. The prepared composite film material is different from a current composite film material prepared by blending polyimide and aluminum oxide and then carrying out film casting, the composite film material has a nano-scale polyimide layer with uniform thickness and a nano-scale aluminum oxide layer deposited and combined on the upper surface of the polyimide layer, and the composite film material has a good radiation refrigeration effect.

The application relates to the technical field of circuit conveying equipment, in particular to a fireproof polyvinyl chloride material and a preparation method thereof and a cable sheath pipe. The fireproof polyvinyl chloride material comprises the following raw materials in parts by weight: 90-110 parts of polyvinyl chloride, 10-20 parts of a compatilizer, 8-15 parts of ammonium polyphosphate and 5-8 parts of an ultraviolet aging resistant additive, wherein the ultraviolet aging resistant additive is a mixture of N,N"-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,6-hexanediamine and a metal hydroxide. The fireproof polyvinyl chloride has excellent flame retardant performance and ultraviolet aging resistance.

This invention relates to an antibacterial copolyamide and its preparation method. The antibacterial copolyamide comprises a polyamide A structure formed by hexamethylenediamine and a dodecanoic acid, at least one polyamide B structure other than polyamide A, and an antibacterial agent C structure. The polyamide B structure is formed by at least one diacid b1 and at least one diamine b2, and / or by ring-opening of a lactam b3. The antibacterial agent C structure contains a quaternary phosphonium salt group and is formed by a quaternary phosphonium salt antibacterial agent containing a carboxylic acid group and the diamine b2. The melting point of the antibacterial copolyamide is 180℃~210℃. The antibacterial copolyamide of this invention exhibits good antibacterial stability, possesses highly efficient and long-lasting antibacterial effects, and does not affect the transparency of the polyamide itself.

This invention relates to a method for preparing hexamethylenediamine by hydrogenation of adiponitrile in the presence of a Raney nickel catalyst, wherein a Raney nickel catalyst modified by treatment with carbon monoxide or carbon dioxide in a liquid medium is used.

This application discloses a slurry for a flexible pressure sensor, its preparation method, and the sensor and its preparation method. The preparation method of the flexible pressure sensor slurry includes the following steps: In a first solvent, a conductive filler is ultrasonically dispersed. The conductive filler includes: (1) graphene oxide, or (2) the graphene oxide and multi-walled carbon nanotubes, wherein the mass ratio of the multi-walled carbon nanotubes to the graphene oxide is (0-3):(1-2). After the reaction, under ultrasonic oscillation, the remaining amine substances are removed using anhydrous ethanol, centrifuged, and pressure-sensitive powder is prepared. A binder, a curing agent, and the pressure-sensitive powder are mixed and ultrasonically dispersed in a second solvent to obtain a uniform slurry. The first solvent is ethylenediamine, hexamethylenediamine, or decanediamine. This application makes technical improvements to the slurry preparation and integration scheme for flexible pressure sensors based on carbon nanotubes.

The invention discloses a preparation method of a slurry-extracting and gas-retaining concrete admixture, which is characterized in that dodecenyl succinic anhydride, ethanediamine or hexamethylenediamine and caprolactam are used as raw materials, and a carboxyl-terminated polyamide monomer (PAMA) with a long-chain olefin hydrophobic structure is synthesized through amidation and ring-opening reaction. And carrying out free radical copolymerization on the monomer, acrylic acid, a polyether macromonomer (HPEG / TPEG), hydroxyethyl acrylate, hydroxypropyl acrylate and the like in an aqueous solution to prepare a target additive. According to the invention, the self-synthesized PAMA monomer is introduced, and a long-chain hydrophobic structure in molecules of the PAMA monomer can be directionally adsorbed on the surfaces of cement particles to form a stable microscopic hydrophobic region and has a synergistic effect with the acrylate monomer, so that the gas-retaining property and the slurry extraction effect of the concrete are remarkably enhanced, and the problems of bleeding and segregation are effectively solved. The method is simple in process, the product is excellent in comprehensive performance, and the compounding process is simplified.

The invention provides a method for synthesizing 6-aminocapronitrile from caprolactam. The method comprises the following steps: a gasification device is sequentially provided with a uniform distribution part, an efficient dispersion part, a high-temperature gasification part and an in-situ separation part from top to bottom; liquid-phase caprolactam is injected from the top end of the gasification device, and ammonia gas is injected through the efficient dispersion part; in the efficient dispersion part, liquid-phase caprolactam is broken in a first circular tube nest under the shearing action of gravity and ammonia gas to form liquid drops, and after high-temperature gasification, a gas phase is output from the side part of the gasification device, then enters the reactor filled with the monolithic catalyst from the bottom of the reactor, reacts through the monolithic catalyst and is output from the top of the reactor. According to the invention, caprolactam can be efficiently gasified, coking is not easy to generate, the retention time of a gas-phase reactant in the reactor can be accurately controlled, the reaction efficiency is greatly improved, the discharge amount of wastes in the production process of hexamethylenediamine is reduced, the cost is reduced, the economic benefit is improved, and a guarantee is provided for green, environment-friendly and safe production.

The application discloses a two-component nylon elastic yarn and a manufacturing process thereof, and relates to the technical field of textiles.The two-component nylon elastic yarn comprises an elastic yarn body which is composed of a yarn core and an outer surface layer arc ring part; the yarn core is a nylon polymer fiber; the outer surface layer arc ring part is an outer nylon fiber; and the elastic yarn body is obtained by blowing ATY yarn according to a blowing ratio of 1:0.8-2.8 between the nylon polymer fiber and the outer nylon fiber.The elastic yarn body is obtained by condensation of modified hexanediamine as monomer one and modified heptanedioic acid as monomer two, so that the stability of the elastic yarn body is increased, the dyeing temperature of the elastic yarn body is increased due to the π bond effect, the dyeing uniformity and elasticity are effectively improved, and the effect of high-temperature setting is suitable.

The invention relates to a method for specifically detecting tetrahydrocannabinol and hydride thereof by utilizing bridged beta-cyclodextrin, and belongs to the technical field of analysis and detection of supramolecular materials. The method comprises the following steps: firstly, combining 1, 6-hexamethylenediamine bridged bis-beta-cyclodextrin with an indicator to form a supramolecular probe; in a buffer system with a pH value of 9-11, tetrahydrocannabinol or a hydride thereof specifically competes to be combined with a cavity and displaces an indicator by utilizing a synergistic inclusion effect of a bridging subject and dissociation difference of guest molecules, so that the system is subjected to fluorescence quenching or color change, and a structural analogue cannabidiol does not generate obvious interference. The method solves the problems that the sensitivity is low and cannabidiol cannot be effectively distinguished in the prior art through cooperation of specific main body construction and environment regulation, has the advantages of being rapid in detection, high in specificity, high in accuracy and the like, and is suitable for environment monitoring and field screening.

The application is a kind of low water absorption and high heat distortion temperature copolymer nylon resin, which comprises the following components in weight percentage: 98% to 99.8% of nylon salt; 0.1% to 1% of end-capping agent; and 0.1% to 1% of hindered phenol monomer. The nylon salt comprises 60% to 80% of nylon 66 salt and 20% to 40% of nylon 6T salt. The end-capping agent is glycidyl ether containing silane and / or siloxane structure. The hindered phenol monomer comprises one or more of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexanediamine, 4,4'-butylidenebis(6-tert-butyl-3-methylphenol), and tris(2-methyl-4-hydroxy-5-tert-butylphenyl)butane. The product of the application can meet the production requirements of differentiated copolymer nylon and has universal applicability. Without adding filling materials such as fiber, kaolin, talc, etc., the water absorption can be significantly reduced, the melting point and heat distortion temperature can be increased, and the inherent properties of nylon 66 resin are not affected.

The present invention relates to a process for treating a polymeric material (PM) comprising a polyamide (PA66) (PA66) based polymer and at least one filler (F1), the process comprising providing a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1) and a solvent composition (SC) comprising at least one solvent (S1) with a Hansen parameter H in the range of from 10 to 25 MPa0.5, preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC); subjecting mixture (M-0) to conditions for dissolving the polyamide (PA66) based polymer (D1) comprising a temperature T(D1) in the range of from 50 to 280°C and a time t(D1) sufficient to at least partially dissolve the polyamide (PA66) based polymer, preferably for a time of at least 5 minutes, in particular in the range of from 15 to 600 minutes, obtaining a mixture (M-1) comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues; and separating the filler (F1) and insoluble residues from mixture (M-1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and dissolved polyamide (PA66) based polymer. The present invention also relates to the filler obtained in the process as well as a polyamide (PA66) based polymer obtained according to said process.

The application discloses a preparation process of electronic-grade trans-1,2-cyclohexanediaminetetraacetic acid. The preparation process takes industrial-grade 1,2-cyclohexanediamine as raw material, reacts the 1,2-cyclohexanediamine with electronic-grade organic acid to generate a water-soluble salt, crystallizes at 0-30 DEG C, filters out the crystal to reserve the filtrate, adds an alkaline solution to the filtrate, then adds a polar organic reagent to extract, directly adds an aqueous bromoacetic acid solution to the oil phase to react, after the reaction is completed, adds electronic-grade dilute acid to precipitate trans-1,2-cyclohexanediaminetetraacetic acid until the PH of the system is less than or equal to 2, filters and reserves the solid, washes with pure water, and electronic-grade trans-1,2-cyclohexanediaminetetraacetic acid is obtained. The method has a clear process route, can effectively remove metal ion impurities in the synthesis process, the obtained trans-1,2-cyclohexanediaminetetraacetic acid product has high purity, can be used for preparing high-end semiconductor cleaning liquid, and meets the strict requirements of advanced processes on the purity of cleaning chemicals.

The invention discloses an anti-corrosion PVC printing film and a preparation method thereof, and relates to the technical field of printing films. When the anti-corrosion PVC printing film is prepared, silane modified titanium dioxide and benzotriazole-1-carbonyl chloride are subjected to a reaction, and benzotriazole modified titanium dioxide is prepared; the preparation method comprises the following steps: reacting polyvinyl chloride with furan-2-mercaptan to prepare modified polyvinyl chloride; the preparation method comprises the following steps: reacting maleic anhydride with 2, 2, 3, 3, 4, 4, 5, 5-octafluoro-1, 6-hexamethylenediamine to prepare fluorine modified bismaleamic acid; phosphorus-containing castor oil, hydrogen peroxide and concentrated sulfuric acid are subjected to a reaction, and the phosphorus-containing castor oil-based plasticizer is prepared. The modified polyvinyl chloride, polyvinyl chloride, benzotriazole modified titanium dioxide, fluorine modified maleamic acid and a phosphorus-containing castor oil-based plasticizer are fused and pressed into a film, and the anti-corrosion PVC printing film is prepared. The anti-corrosion PVC printing film prepared by the invention has excellent anti-corrosion, anti-aging, self-repairing and flame-retardant properties.

The invention belongs to the technical field of polyamide preparation, and particularly relates to a preparation method for reducing the freezing point of bio-based polyamide. A bio-based polyamide prepolymer is prepared from raw materials including dimer acid, isostearic acid, ethanediamine, hexamethylenediamine, a polyether crosslinking monomer, a branched chain alkylamine monomer, an antioxidant dispersant and a high-temperature stabilizer, and then the bio-based polyamide prepolymer is mixed with alcohol-soluble polyester and a compatilizer to obtain bio-based polyamide which has a low freezing point, good anti-gel performance and environmental friendliness and can be used for preparing the bio-based polyamide. And the printing quality in a low-temperature environment can be obviously improved.

The invention discloses a tissue slice in-situ hybridization pretreatment liquid and a use method, the tissue slice in-situ hybridization pretreatment liquid is characterized in that the tissue slice in-situ hybridization pretreatment liquid is composed of a compound component A solution and a surfactant component B solution, the compound component A solution and the surfactant component B solution have a proper octanol / water partition coefficient and can effectively remove endogenous fluorescent substances, and a solvent is a hydrophilic solvent; wherein the component A is one or a combination of more of bis (hexamethylene) triamine, dodecyl pyridine chloride, cyclohexylamine, isophorone diamine, N-benzylamino ethanol, N, N, N, N-tetramethyl-1, 6-hexamethylenediamine and 1, 3-bis (aminomethyl) cyclohexane; and the component B is one or a combination of more of triton X-100, tween-20, lauryl sodium sulfate and sodium dodecyl benzene sulfonate. The method is used when the FFPE slice is subjected to fluorescence in-situ hybridization or immunofluorescence experiments, autofluorescence can be reduced in a rapid removal mode, the pretreatment effect is remarkably improved, and the hybridization efficiency of samples difficult to hybridize is improved.

The invention relates to a preparation method of high molecular weight nylon 66 resin, which comprises the following steps: dispersing a catalyst, a stabilizer and an optional lubricant in molten hexamethylenediamine, and then adding the mixture into adipic acid powder or melt stirred in a reaction kettle for mixing; stirring reactants in a reaction kettle for 90 to 600 minutes at the temperature of 145 to 195 DEG C and the pressure of 1 to 10 MPa under the protection of inert gas; the reaction kettle is deflated to a normal pressure state within 30-150 min; vacuumizing the reaction kettle to the pressure of 0.01-0.5 MPa, and then carrying out solid-phase polymerization for 0-300 minutes; and naturally cooling to room temperature, and taking the material to obtain the nylon 66 polymer. According to the invention, decomposition of nylon 66 salt is inhibited by utilizing solid-phase polymerization, adding an auxiliary agent or supplementing pressure, and volatilization of hexamethylenediamine is effectively prevented; the phosphorus compound and the silicon compound are added as stabilizers to improve the thermal stability of the nylon 66 and delay the generation of gel. The nylon 66 product prepared by the invention is high in purity, good in thermal stability and oxidation resistance and good in processability, and is suitable for the fields of civil filaments and engineering plastics.