1478 results about "Phosphine" patented technology

The invention belongs to the technical field of ethylene oligomerization catalysis, and discloses a catalytic system for ethylene selective oligomerization and a preparation method and application thereof, and the catalytic system comprises a carbon bridge bidentate phosphine chromium catalyst, an organic boron auxiliary agent and an aluminum-containing activator in a molar ratio of 1: (1-50): (100-1500). The carbon-chromium catalyst is prepared by the following steps: reacting CrCl3 (THF) 3, a ligand and CH2Cl2 under stirring, filtering, and carrying out post-treatment to obtain the catalyst, the catalyst and the aluminum-containing activating agent are uniformly mixed, and then the organic boron auxiliary agent is added and stirred. The catalyst system constructed by the carbon bridge bidentate phosphine chromium catalyst, the organic boron auxiliary agent and the aluminum-containing activating agent realizes ethylene selective oligomerization. The catalytic system can realize high-efficiency and high-selectivity preparation of 1-hexene and 1-octene under the condition that aluminoxane co-catalysts such as MAO and MMAO are not adopted, the catalytic activity is high, the reaction initiation is rapid, the operation is stable, and the repeatability is good.

The invention discloses a rare-earth metal arylamine group compound as well as preparation method and application thereof. The invention discloses the rare-earth metal arylamine group compound which is characterized in that a general formula of the rare-earth metal arylamine group compound is (2,6-R12PhNH)5LnLi2(THF)2, wherein Ln is a rear-earth metal selected from one of neodymium, samarium, ytterbium or yttrium; R1 is selected from one of hydrogen, methyl or isopropyl. The rare-earth metal arylamine group compound has the advantages that the rare-earth metal arylamine group compound has a definite structure; raw materials used in the preparation method are simple, easily obtained and cheap; the reaction process is simple and easily operated; the rare-earth metal arylamine group compound product is conveniently purified and the yield of the product is high; the rare-earth metal arylamine group compound has a high activity when acting as a single component catalyst to catalyze a hydrogen phosphine reaction of aldehyde or ketone and phosphite ester; the use amount of the catalyst is less; the yield is high; a substrate has wide universality; a new and simple method is provided for synthesis of a-hydroxyphosphonate.

The invention discloses a polyethylene glycol-poly (2-vinyl) ethylene glycol copolymer and a preparation method thereof, and relates to the technical field of high polymer materials, and the structure of the polyethylene glycol-poly (2-vinyl) ethylene glycol copolymer is selected from any one of the following structural formulas: # imgabs0. The preparation method comprises the following steps: taking hydroxyl-containing polyethylene glycol and 4-vinyl-1, 3-dioxocyclopent-2-ketone or vinyl ethylene oxide as raw materials; under the action of a palladium catalyst and a phosphine ligand, the polyethylene glycol-poly (2-vinyl) glycol copolymer is efficiently prepared and can be used in the fields of hydrophilic / hydrophobic materials, drug carriers, antibacterial materials, phase change materials, shape memory materials and the like.

The invention discloses a low-cost neutral aqueous organic iron-cerium flow battery, and belongs to the field of electrochemical energy storage. The positive electrode electrolyte and the negative electrode electrolyte both adopt organic phosphine ligand chelating metals in a water system, and organic phosphine ligands are selected from 2-hydroxyphosphonoacetic acid, etidronic acid, diethylenetriaminepenta (methylene phosphonic acid), 2-phosphonobutane-1, 2, 4-tricarboxylic acid, polyhydric alcohol phosphate ester, hexamethylenediamine tetra (methylene phosphonic acid), polyamino polyether methylene phosphonic acid and bis (1, 2, 4-tricarboxylic acid. And one or more of 2, 6-hexylidene triamine penta (methylene phosphonic acid) and lithium, sodium, potassium and ammonium salt derivatives thereof. And the supporting electrolyte is used for adjusting and stabilizing the pH environment of the electrolyte. According to the invention, no additional auxiliary electrolyte is needed, high conductivity and stable performance can be achieved, and a new possibility is developed for development and application of a flow battery technology. The material has the characteristics of stable performance, low cost, wide raw material source and environmental friendliness, and is suitable for automobile power supplies, household energy storage, standby power supplies, large-scale energy storage devices and the like.

To provide a method for producing a modified resin that allows efficient production of a desired modified resin by enabling smooth progress of a modification reaction of a resin having an epoxy group by using a tertiary phosphine as a catalyst.SOLUTION: A method for producing a modified resin comprises a step (A-1) of reacting a nucleophile having no polymerizable unsaturated bond with a resin containing an epoxy group, under the presence of a catalyst containing a tertiary phosphine and under an atmosphere in which the oxygen concentration of a gas phase part within a reaction vessel is less than 2 vol.%.SELECTED DRAWING: None

A preparation method for a lithium manganese iron phosphate positive electrode material, comprising the following steps: (1) uniformly stirring an iron source, a phosphorus source, a lithium source and a dispersing agent in water, adding a manganese source, and uniformly mixing same to obtain a precursor pre-slurry; and (2) adjusting the solid content of the precursor pre-slurry to reach a target solid content A, the target solid content A satisfying 30 wt% ≤ A ≤ 60 wt%; (3) carrying out primary grinding treatment on the precursor slurry obtained in step (2); and (4) adding an organic phosphine scale and corrosion inhibitor to the precursor slurry, dissolving same, then drying the obtained slurry, and performing sintering and crushing to obtain the lithium manganese iron phosphate positive electrode material. Also provided is a positive electrode material prepared by the method.

The invention provides a method for synthesizing 1, 2-bis (4-vinyl phenyl) ethane, which comprises the following steps: adding a first solvent, methyl triphenyl phosphine halide and strong alkali into a reaction flask, and uniformly stirring to obtain a first mixed solution; heating the first mixed solution and carrying out reflux reaction for 1 hour; dropwise adding a 1, 2-bis (p-formaldehyde phenyl) ethane solution until the reflux reaction is finished to obtain a second mixed solution; reducing the temperature of the second mixed solution to room temperature, and adjusting the pH value of the second mixed solution to obtain a first solution; layering the first solution, and taking an organic layer; adding a polymerization inhibitor into the organic layer to obtain a second solution; concentrating the second solution to obtain a 1, 2-bis (4-vinyl phenyl) ethane crude product; adding a poor solvent into the crude product, stirring and crystallizing; filtering the crystal to obtain a filter cake, adding a second solvent into the filter cake, and washing and drying the filter cake to obtain 1, 2-bis (4-vinyl phenyl) ethane; the method for synthesizing the BVPE is simple and low in raw material cost, and the synthesized BVPE is high in purity and free of product isomeride.

The invention discloses a graphite piece silicon carbide coating and a preparation method thereof, and belongs to the technical field of inorganic non-metallic materials. The method comprises the following steps: firstly, carrying out surface polishing, cleaning and drying pretreatment on a graphite piece; then a solution containing phosphinazine functionalized silazane and a boron-silicon carlamide compound is adopted for spraying the pretreated graphite piece, drying and curing are conducted, and a surface modification layer is formed; and finally, placing the surface-modified graphite piece in chemical vapor deposition equipment, and depositing at specific temperature, pressure and atmosphere to form the silicon carbide coating. According to the method, uniform nucleation and crystallization of the silicon carbide coating are effectively promoted through unique surface modification treatment, and the compactness and uniformity of the coating and the binding force of the coating and a matrix are remarkably improved. The obtained coating graphite piece has excellent thermal corrosion resistance, oxidation resistance and mechanical property, the service life and the use frequency of the coating graphite piece in semiconductor epitaxial equipment are remarkably prolonged, the whole preparation process is environmentally friendly, and the coating graphite piece is suitable for coating treatment of a large graphite base material.

The invention belongs to the technical field of biology, and particularly relates to a reagent combination and a kit for extracting nucleic acid through a paramagnetic particle method and application of the reagent combination and the kit. The reagent combination or the kit does not adopt beta-mercaptoethanol with pungent smell or dithiothreitol needing to be stored at low temperature as an antioxidant, but adopts tris (2-formylethyl) phosphine hydrochloride and / or metabisulfite as an antioxidant, belongs to common salt chemical reagent powder, can be stored at normal temperature, and can be used for preparing a reagent for the first time. Manual addition by experimenters before an experiment is not needed, so that nucleic acid (RNA) released by splitting decomposition can be effectively prevented from being oxidized and denatured, and the integrity of extracted nucleic acid (total RNA) fragments is ensured; especially, the metabisulfite is commonly used in food additives, does not cause harm to the body, and is non-toxic and non-volatile.

The invention discloses a polyarylamine hole transport material, a synthesis method thereof and a perovskite solar cell, and belongs to the field of chemical and energy materials. The synthesis method comprises the following steps: mixing arylamine, aryl halide, a palladium catalyst, a phosphine ligand and organic alkali, carrying out a reflux reaction, and then adding an end-capping reagent to terminate the reaction; and settling the product in methanol, carrying out suction filtration to obtain a solid, and then carrying out Soxhlet extraction. By adjusting the activity of the reaction intermediate, two continuous C-N cross-coupling catalytic cycles are achieved, in the first catalytic cycle, high-reaction-activity arylamine and aromatic halide are coupled to generate a low-activity bifunctional secondary arylamine intermediate, the intermediate is kept in a dormant state in the first catalytic cycle, and after primary arylamine is completely consumed, the intermediate is separated from the primary arylamine, and the secondary arylamine is separated from the primary arylamine. And the secondary arylamine intermediate and the aromatic halide are subjected to coupling polymerization, so that accurate synthesis of a series of polyarylamine with narrow molecular weight distribution is realized. The polyarylamine can be used as a hole transport material to construct a perovskite solar cell, adjust interface hole extraction and promote perovskite growth.

The invention relates to a process method of red phosphorus, in particular to a process for producing red phosphorus by a high-temperature closed method, which comprises the following steps: S1, preparing yellow phosphorus; s2, melting is conducted; s3, high-temperature conversion; s4, crushing; s5, alkali boiling; s6, rinsing and filtering; s7, dehydrating; s8, drying is conducted; the method for producing a slurry containing red phosphorus particles according to the present invention is advantageous in that it is a method advantageous for industrial production, it is possible to obtain a slurry containing red phosphorus particles in which phosphine gas can be generated in a short time and with stable quality, and in which the dissolution and precipitation of an oxyacid of phosphorus are reduced, and it is also possible to produce a slurry containing red phosphorus particles. According to the present invention, the red phosphorus particles obtained by a method for producing a slurry containing red phosphorus particles can be used as a raw material for production, and stabilized red phosphorus in which the amount of phosphine gas generated and the amount of oxyacid dissolution and precipitation of phosphorus are effectively suppressed can be obtained; in the whole preparation process, the labor intensity is reduced, the production efficiency is improved, and the production safety is ensured.

The invention provides a novel chiral ferrocene bridged binaphthyl skeleton phosphine ligand and application thereof. The ligand has the advantages of low cost, simplicity in synthesis, air stability and the like. The ligands have good catalytic activity and enantioselectivity in the asymmetric hydrogenation reaction of ketone, and have certain industrial application prospects in the synthesis of pharmaceutical molecules.

The intelligent fumigation warehouse inspection robot comprises a propelling frame, a bottom frame and a releasing frame which are connected in sequence, a medicament outer box is installed in the middle of the upper surface of the bottom frame, and a control panel is embedded outside the medicament outer box; the intelligent fumigation in the granary is jointly realized by taking a measure of combining continuous medicament loading and fixed-point medicament distribution, and targeted and accurate medicament application is performed through intermittent release and fixed-point medicament distribution after medicament loading, so that the fumigation effect in the granary is unified; in combination with parameter measurement of a gas fumigation comprehensive value and a pesticide application point position distribution value, the distribution condition of fumigation point positions and the distribution condition of the pesticide amount in the current granary are judged according to a granary patrol fumigation coefficient, and the distribution positions of the fumigation point positions and accurate infusion of the pesticide amount are correspondingly controlled; the problems that due to season change and grain condition parameter change, the concentration of phosphine gas in a granary is not uniform, and pesticide application accuracy is limited are solved, and grain storage safety is greatly guaranteed.

The invention discloses a method for preparing organic carboxylic ester through olefin hydroesterification, and belongs to the technical field of organic carboxylic ester preparation. According to the technical scheme, terminal olefin, CO and alcohol serve as reactants, organic carboxylic ester with one more carbon is generated under the action of an acid auxiliary with zwitterionic liquid serving as a solvent, a phosphine ligand and a catalyst of a Pd compound, the structure of the zwitterionic liquid simultaneously contains an imidazole group and a sulfonate group, and the structural formula of the zwitterionic liquid is shown in the description. The concentration of the zwitterionic liquid in the reaction system is the solvent amount; the molar ratio of the Pd compound to the ionic liquid is (0.1-1): (1000-10000), the molar ratio of the phosphine ligand to the ionic liquid is (0.1-1): (10-100), and the molar ratio of the acid to the ionic liquid is (0.1-1): (2-50). The method has the advantages of mild reaction conditions, wide raw material application range, high reaction activity, good stability and the like, and is a reaction system with a very good industrial application prospect.

The invention discloses a phosphorane mixed gas filling method, and relates to the technical field of mixed gases, the phosphorane mixed gas filling method comprises instrument pretreatment, step-by-step filling, post-vacuum treatment, quality detection and safety monitoring, and the phosphorane mixed gas filling method has the advantages that a mixed accelerant is added into a filling pipeline in the phosphorane and argon filling process, so that the filling efficiency is improved; by providing a large number of active sites and unique gas diffusion channels, uniform mixing of phosphorane and argon can be accelerated, the uniformity and accuracy of mixed gas matching are improved, in the process of action of an accelerant and gas, argon molecules are fully contacted and collided with dissociated and adsorbed phosphorus atoms under the guidance of a special structure of a nano-porous material, and the phosphorus atoms are separated and adsorbed. The mixed accelerant is added to promote rapid and uniform mixing of the phosphorus and the alkane, stable and accurate-proportion phosphorus and alkane mixed gas is formed, and in the whole process, the mixed accelerant continuously plays a role, so that the uniform mixing efficiency of the mixed gas in the filling process is greatly improved compared with a traditional mode.

The present invention provides a method for preparing tin or tin alloy-coated copper powder and a low-temperature conductive paste, wherein the method comprises the following steps: S10, pretreating the surface of the copper powder to remove oxides and impurities on the copper powder surface; S20, placing the pretreated copper powder in an electroplating solution containing an organic phosphine compound additive; electroplating the copper powder using tin metal or tin alloy as an anode and copper powder as a cathode, wherein the copper powder is dispersed during the electroplating process; S30, after the electroplating is completed, filtering, washing, and drying to obtain the tin or tin alloy-coated copper powder. The addition of the organic phosphine compound in the present invention greatly improves the compactness of the tin or tin alloy coating formed on the surface of the copper powder, thereby making the prepared tin-coated copper powder or tin alloy-coated copper powder have the advantage of better oxidation resistance.

The invention discloses a glass fiber reinforced polyurethane material and a preparation method thereof, and relates to the technical field of high polymer materials. When the glass fiber reinforced polyurethane material is prepared, bis (4, 4 '-dihydroxy) phenylacetylene reacts with bis (pinacolato) diboron and 4-bromopyridine in sequence to prepare an ultraviolet absorption monomer; the preparation method comprises the following steps: polymerizing polyether glycol, an ultraviolet absorption monomer, a sulfonium salt diol monomer and 1, 6-hexamethylene diisocyanate to prepare functional polyurethane; the preparation method comprises the following steps: polymerizing and coating a boron-containing flame-retardant monomer and bis (2-aminoethyl) phosphine on glass fibers to prepare pre-modified glass fibers; the pre-modified glass fiber and hydroxymethylated triazoline diketone are subjected to a reaction, and modified glass fiber is prepared; and uniformly mixing the functionalized polyurethane and the modified glass fiber, and carrying out injection molding to obtain the glass fiber reinforced polyurethane material. The glass fiber reinforced polyurethane material prepared by the invention has excellent anti-aging, antibacterial, flame-retardant, self-repairing and mechanical properties.

The invention discloses a palladium catalyst as well as a preparation method and application thereof. The structural formula of the palladium catalyst is shown as a formula (I), according to the invention, an alkoxy group is introduced into the skeleton of the palladium catalyst and N-methylimidazole is coordinated with palladium, so that the catalytic yield of the palladium catalyst is effectively improved, and long-chain alkyl polyarylamine with high molecular weight and narrow distribution is obtained; the method does not need to use a traditional phosphine ligand, avoids potential hazards of phosphine compounds to operators and the environment in the use process, and is expected to be industrially applied on a large scale due to the fact that the phosphine compounds are stable to air and moisture and can be stored for a long time.

The invention relates to the technical field of chemical synthesis, and particularly discloses an alpha methyl beta phosphonate compound and a synthesis method thereof.The alpha methyl beta phosphonate compound is obtained by directly oxidizing the alpha position of aryl ketone into carbon positive and combining the carbon positive with diethyl phosphite anions under the alkaline condition by using hydrogen peroxide and iodine as oxidizing agents. The alpha methyl substituted beta phosphate ester compound can be generated by a one-step method. The method is suitable for synthesizing compounds of phosphoric acid (methyl, ethyl, propyl and the like) with different alkyl substitutes (methyl, ethyl, propyl and the like) at carbonyl alpha positions. According to the method, the alpha-methyl substituted beta phosphate compound can be synthesized only by using commercial cheap and easily available aryl ketone as a raw material, using hydrogen peroxide and iodine as oxidants and using diethyl hypophosphite as a phosphine source, and reacting in the DMSO solvent at 100 DEG C for 12 hours, so that the target product can be obtained, and the yield is excellent. Compared with previously reported methods, the method does not need low-temperature operation, is simple to operate, adopts a one-pot method, does not need a metal catalyst, and all raw materials are common bulk chemicals.

The invention relates to the technical field of carbonylation, and discloses a phosphine nitrogen compound and a metal complex as well as a preparation method, a composition and application thereof and a carbonylation reaction method. Wherein the phosphine-nitrogen compound has a chemical structure as shown in a formula (II), and the metal complex prepared from the phosphine-nitrogen compound has the characteristics of high catalytic activity, good thermal stability, difficulty in inactivation and high product selectivity in catalytic carbonylation reaction. # imgabs0 #

The invention discloses a method for preparing polyol ester by carrying out hydrogen esterification reaction on long-chain olefin and polyol, which comprises the following steps of: by taking the long-chain olefin and the polyol as reactants, introducing carbon monoxide to control the pressure to be 1.0-8.0 Mpa and the reaction temperature to be 60-150 DEG C under the action of a composite catalyst consisting of a palladium compound, a phosphine ligand and organic acid and an organic solvent; and preparing to obtain the polyol ester for lubrication. Compared with the existing polyol ester synthesis method, the method has the advantages of mild reaction conditions, wide raw material applicability, high reaction activity and the like.

The invention discloses a synthesis method of an aryl bidentate phosphine compound, which comprises the following steps of: (1) reacting benzene or alkylbenzene with benzyl chloride or 4-alkyl benzyl chloride at 0-100 DEG C for 0.5-5 hours in the absence of oxygen and under the condition of a lewis acid catalyst to prepare a first intermediate; (2) dropwise adding an alkyl lithium reagent into tetramethylethylenediamine at the temperature of-30 to 40 DEG C under the conditions of no water, no oxygen and a solvent, stirring for 1 to 3 hours, dropwise adding the first intermediate into the mixed solution at normal temperature, and reacting for 4 to 20 hours at the temperature of-20 to 40 DEG C to prepare a second intermediate; and (3) under anhydrous and anaerobic conditions, adding diphenyl phosphine chloride into the second intermediate obtained in the step (2), and reacting at-20 to 80 DEG C for 5-60 hours to obtain the aryl bidentate phosphine compound. The synthesis method disclosed by the invention is simple in process, mild in condition and high in product yield, and has a relatively good industrial prospect.

The invention discloses a fire-resistant and flame-retardant nylon composition as well as a preparation method and application thereof, the nylon composition comprises the following components in parts by weight: 28-60 parts of aliphatic nylon resin, 4-15 parts of semi-aromatic nylon resin, 18-32 parts of glass fiber, 12-21 parts of hypophosphite, 3-9 parts of a flame-retardant synergist and 1-4 parts of a carbon formation accelerator, the mass ratio of the hypophosphite to the flame retardant synergist is (2-4): 1; the relative viscosity of the aliphatic nylon resin is 2.6 to 2.9; the carbon forming accelerant is rare earth oxide or zinc stannate. The organic phosphine flame-retardant nylon composition disclosed by the invention has excellent flame retardant property and fire resistance and also has high mechanical property.

The invention discloses an organic phosphine flame-retardant nylon composition with excellent wet electrical properties as well as a preparation method and application of the organic phosphine flame-retardant nylon composition. The organic phosphine flame-retardant nylon composition comprises the following components in parts by weight: 23-53 parts of short carbon chain aliphatic nylon resin, 10-15 parts of long carbon chain aliphatic nylon resin, 5-10 parts of semi-aromatic nylon resin, 20-30 parts of glass fibers, 10-16 parts of hypophosphite and 2-6 parts of an inorganic synergist, the glass transition temperature of the semi-aromatic nylon resin is greater than or equal to 88 DEG C, and the glass transition temperature of the long carbon chain aliphatic nylon resin is greater than or equal to 90 DEG C. The glass fibers are hydrolysis-resistant glass fibers. The organic phosphine flame-retardant nylon composition disclosed by the invention can realize the unification of high flame-retardant property and high-wet-state electrical property, and has high mechanical property at the same time.

The invention discloses an anti-aging and anti-corrosion coating and a preparation method thereof, and relates to the technical field of coatings. When the anti-aging and anti-corrosion coating is prepared, firstly, tetramethyl tetravinyl cyclotetrasiloxane, n-butyllithium and dimethyl-3-chloropropyl chlorosilane react to obtain modified polysiloxane, then 4-vinylpyridine, methyl methacrylate and n-butyl acrylate are copolymerized and then react with the modified polysiloxane, and then bis (4-chlorphenyl) phosphine is grafted to obtain the anti-aging and anti-corrosion coating. Finally, reacting with p-aminodiphenylamine to obtain modified acrylic resin; secondly, enabling the titanium dioxide nanosheet pretreated by 3-aminopropyltrimethoxysilane to react with ester phthalocyanine, and then hydrolyzing to obtain a modified titanium dioxide nanosheet; finally, mixing the modified acrylic resin, the modified titanium dioxide nanosheet, a solvent, a dispersing agent and a defoaming agent to obtain the anti-aging and anti-corrosion coating. The anti-aging and anti-corrosion coating prepared by the invention has excellent anti-aging, anti-corrosion, flame-retardant and antibacterial properties.

The invention discloses weather-resistant unsaturated polyester resin as well as a preparation method and photovoltaic application thereof, and relates to the technical field of high polymer materials. When the weather-resistant unsaturated polyester resin is prepared, 1, 6-hexanediol, itaconic acid and an ultraviolet absorption monomer are subjected to esterification and polycondensation to prepare unsaturated polyester; the preparation method comprises the following steps: carrying out reaction on naringenin and 4-isocyanate-tetramethylpiperidine oxide to prepare a functional cross-linking agent; the preparation method comprises the following steps: reacting 3-(4-chlorphenyl) phosphine, 2, 2 '-thiobis (4-chlorophenol) and 2-butene-1, 4-diamine, and polymerizing and coating silicon dioxide to prepare pre-modified silicon dioxide; reacting the pre-modified silicon dioxide, n-butylamine and nickel acetate to obtain modified silicon dioxide; uniformly mixing unsaturated polyester, a functional cross-linking agent and modified silicon dioxide, and performing injection molding to obtain the weather-resistant unsaturated polyester resin. The weather-resistant unsaturated polyester resin prepared by the invention has excellent anti-aging, flame-retardant, self-repairing and mechanical properties.

The invention discloses a copper-titanium etching solution and a preparation method thereof, and belongs to the technical field of etching solution preparation. The etching solution is prepared from the following components in percentage by mass: 4.5-7.5% of potassium peroxymonosulfate composite salt, 1.2-2.8% of sodium percarbonate, 1.2-2.8% of benzotriazole-2, 3, 4-triazole-2, 3, 4-triazole-2, 3, 4-triazole-2, 3, 4-triazole-2, 3- The cleaning agent is prepared from the following components in percentage by weight: 1.2%-1.8% of 1, 3-dicarboxylic acid, 0.3%-0.8% of 5-aminotetrazole, 0.15%-0.45% of ethylenediamine tetraacetic acid tetrasodium salt, 0.15%-0.45% of hydroxyethylidene diphosphonic acid, 0.15%-0.45% of cocamidopropyl betaine, 0.3%-0.8% of benzotriazole, 0.15%-0.45% of 2-mercaptobenzothiazole, 0.02%-0.08% of poly-N-isopropylacrylamide, 0.7%-1.8% of potassium perchlorate and the balance of ultrapure water. According to the etching solution, the copper-titanium etching rate can be accurately regulated and controlled, back cutting and titanium residues are effectively inhibited, the stability of the etching solution is improved, and the service life of the etching solution is prolonged.

The invention discloses a polyamide composition as well as a preparation method and application thereof, and belongs to the field of high polymer materials. According to the polyamide composition, the organic phosphine flame retardant and the flame-retardant synergist are utilized to form a flame-retardant system, the aromatic polyamide and the zirconium hydroxide are introduced to improve the electrochemical corrosion resistance, and under the synergistic effect of all the components, the composition has excellent mechanical performance, flame retardance and electrochemical corrosion resistance, and the flame-retardant polyamide composition is suitable for being applied to the field of flame retardants. Particularly, the composite material has the electrochemical corrosion resistance under the conditions of high temperature and high humidity (such as the temperature of 85 DEG C and the humidity of 85% RH), and has a very good application prospect in the fields of new energy high-voltage connectors, energy storage connectors and the like.

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 method for preparing 1, 2, 3-trichloropropene with high selectivity by dehydrochlorination of 1, 2, 2, 3-tetrachloropropane, and belongs to the technical field of catalysis. The method comprises the following steps: stirring 1, 2, 2, 3-tetrachloropropane and a sodium hydroxide solution under the conditions of normal pressure and 40-100 DEG C for reflux reaction, after the reaction is finished, cooling the reaction liquid to room temperature, separating the liquid by using a separating funnel, rectifying the obtained oil phase to obtain 1, 2, 3-trichloropropene, adding an improver into the reaction system, and carrying out solid-liquid separation to obtain the 1, 2, 3-trichloropropene. The improver is a complex system composed of a metal salt and a bidentate phosphine ligand or a metal composite oxide. The method provided by the invention has the advantages of fewer reaction steps and simpler equipment, the yield of 1, 2, 3-trichloropropene is as high as 86%, the conversion rate of 1, 2, 2, 3-tetrachloropropane is as high as 92%, the selectivity of the target product is as high as 98%, and the conversion rate and the selectivity of the target product are remarkably improved.