746 results about "Divalent" patented technology

A surface treatment agent containing a hydrocarbon-terminal-group-containing compound of the following formula makes it possible to form a cured film that is exceptional in water repellency, slipperiness, dirt removability, and abrasion resistance, particularly steel wool abrasion resistance and wet abrasion resistance. (R1 is a C12-80 monovalent hydrocarbon group that includes a C12 or higher monovalent or divalent linear unsubstituted aliphatic saturated hydrocarbon group and does not contain a hydrocarbon branched structure, R2 is H, a halogen atom, a hydroxyl group, a siloxy group, an -OSi(CH3)3 group, an -OSi(C2H5)3 group, an amino group, an SH group, a monovalent hydrocarbon group, R1, -V-Z-(Y-A)m, or -Y-A, U is a single bond, C, or a trivalent or tetravalent organic group, V is a single bond or a divalent hydrocarbon group, Z is a single bond, C, Si, N, S, or a trivalent to octavalent organic group, Y is a single bond or a divalent hydrocarbon group, A is a monovalent reactive group, k is 0, 1, or 2, and m is 1-7.)

The invention discloses a multi-network anti-freezing hydrogel electrolyte, a preparation method thereof and application of the multi-network anti-freezing hydrogel electrolyte in an electrochemical device. The hydrogel is prepared by using polyvinyl alcohol (PVA) and polyacrylamide (PAM) to form a basic network skeleton, introducing phytic acid, ethylene glycol and lithium / zinc bimetal salt (Li2SO4 / ZnSO4), and carrying out thermal initiation polymerization and freeze thawing. The hydrogel prepared by the invention has a multiple physical cross-linked network formed by polymer molecular chain entanglement, hydrogen-bond interaction among functional groups and metal coordinate bonds constructed between phosphate groups and divalent metal ions, so that the hydrogel electrolyte has excellent mechanical properties. Due to introduction of ethylene glycol, formation of ice crystals is effectively inhibited, and the hydrogel is endowed with excellent anti-freezing performance; the high-concentration Li < + > and Zn < 2 + > ensure the high ionic conductivity. The supercapacitor assembled by using the hydrogel electrolyte shows relatively high specific capacitance and good capacitance retention rate under bending and freezing conditions, and has good electrochemical properties and safety performance.

The present invention is an addition-curable silicone composition containing components (A) to (C): (A) An addition reaction product of an organopolysiloxane represented by formula (1) and a compound represented by formula (2), the addition reaction product having two addition-reactive carbon-carbon double bonds per molecule. (1) (R1 is a C1-12 monovalent hydrocarbon group, R2 is a methyl group or a phenyl group, a is an integer of 0-50, and b is an integer of 0-300. ), (2) (R3 represents a C1-12 divalent hydrocarbon group.), (B) an organosilicon compound having a hydrogen atom bonded to at least two silicon atoms per molecule, and (C) a hydrosilylation reaction catalyst. Thus, provided are an addition-curable silicone composition that has high transparency and a high refractive index and yields a cured product having high strength and high elongation and a highly reliable optical semiconductor device sealed by a cured product thereof.

The invention relates to the technical field of radionuclide separation, in particular to an Eu (III) / An (III) separation method based on a zirconium phosphonate-based metal organic framework adsorbent, which comprises the following steps: adding the zirconium phosphonate-based metal organic framework adsorbent into an Eu (III) and / or An (III) nuclide-containing aqueous solution with the acid concentration of 0.001-3M to carry out adsorption reaction, and then carrying out solid-liquid separation, wherein the zirconium phosphonate-based metal organic framework adsorbent is a zirconium phosphonate-based metal organic framework material exchanged by metal cations M; the metal cation M is selected from one of alkali metal ions, alkaline earth metal ions or divalent transition metal ions. According to the invention, the interlayer chemical properties of the material are regulated and controlled through ion exchange, so that the adsorbent has ultrahigh selectivity, rapid adsorption kinetics, high adsorption capacity and excellent structural stability on trivalent actinide / simulated nuclides in extremely high-acid, high-salt and intense-radiation environments; the key problems of low separation efficiency and poor stability in a high-acid complex system in the prior art are solved, and the method is suitable for treating high-level liquid waste.

The application discloses a preparation method of layered double hydroxide based on waste incineration fly ash, and comprises the following steps: S1, waste incineration fly ash and leaching solution are added into a mixing container according to a liquid-solid ratio (3-15):1, and leaching is carried out after sufficient mixing, and then a filtrate is obtained after filtration; S2, an aluminum-containing reagent is added into the filtrate obtained in S1, so that the ratio of divalent cations to trivalent cations in the solution is (1.5-2.5):1, the pH range of the solution is adjusted to 10-12, and a mixed suspension is obtained after sufficient stirring; S3, the mixed suspension obtained in S2 is poured into a hydrothermal reaction kettle, and is aged and crystallized through hydrothermal reaction; and S4, the mixed solution after crystallization and aging in S3 is filtered, washed with water, and dried, so that the obtained solid is the layered double hydroxide. The method has the advantages of simple process, easy realization, low requirement on equipment, and universality, can be used for synergistic treatment of other aluminum-containing waste liquid, and the product can be used for heavy metal adsorption, so that the waste incineration fly ash can be fully utilized.

The composition includes an acrylic monomer having a carboxylic acid group, an acrylic monomer having a hydroxyl group, at least one of an alkyl acrylate or alkyl methacrylate, and from 15 to 22 percent by weight of a compound composed of divalent segments L and at least two X groups. The divalent segments L are represented by formula L. Each segment L is independently directly bonded to two secondary N atoms, two tertiary N atoms, or a secondary and a tertiary N atom. Each R1 represents an alkylene group having from 1 to 4 carbon atoms, and at least some of the R1 groups are —CH2—CH2—CH2—CH2—. Each X group is independently represented by the formula CH2═C(R)—C(O)—O—V—W—C(O)—. Articles and methods using the composition are also described.

Provided is a compound including a first ligand LA of Formula IIn Formula I, ring C is a 5- or 6-membered ring; each of X1 to X8 is C or N; one of X1 to X4 is C and is connected to ring C, and one of X1 to X4 is N and is coordinated to a metal M; Y is a divalent linker; K is a direct bond, O, or S; each R′, R″, RA, RB, and RC is hydrogen or a general substituent; at least one of RA or RB comprises an electron-withdrawing group; at least one of RB is a cyclic group; and metal M is selected from Os, Ir, Pd, Pt, Cu, Ag, and Au. Formulations, devices, and consumer products comprising the compound are also disclosed.

The present invention provides a grease composition and an axle bearing in which the grease composition is sealed.SOLUTION: The grease composition of the present invention contains a base oil, a thickener, and an additive, the additive contains an organic metal salt of a divalent metal and an inorganic metal salt of a divalent metal, the total mass of the metal content of the organic metal salt and the metal content of the inorganic metal salt is 1.00% by mass or more based on the grease composition, and the metal content of the organic metal salt with respect to the total mass of the metal content of the organic metal salt and the metal content of the inorganic metal salt is 0.20 or more on a mass basis.SELECTED DRAWING: None

The invention provides a synthesis method of a thioether ligand and a palladium-catalyzed 2-aryl indole compound, and designs an application of the biphenyl thioether ligand and a palladium catalyst in preparation of the 2-aryl indole compound. Indole and arylboronic acid are subjected to a reaction under the action of a palladium catalyst and a biphenyl sulfide ligand, and the structural formula of the biphenyl sulfide ligand is shown in the specification. Ar is phenyl, furyl, thienyl, naphthyl or phenyl substituted by one or more substituent groups; r1 is methyl, methoxyl, fluorine atom, chlorine atom, bromine atom or methyl ester group; r2 is the same or different and is methyl, ethyl, isopropyl, isobutyl, cyclohexyl, benzyl, n-butyl or n-hexyl; r3 is alkoxy, alkylthio, substituted amino or halogen; the palladium catalyst is a divalent palladium compound.

The present invention relates to a bismuth-containing catalyst of formula (R1)2-(R2)-(Bi)3+ (I), wherein (R1)2- is a dianion of formula (II*), wherein A is unsubstituted or at least monosubstituted linear C3-30-alkylene, wherein at least two not adjacent CH2 groups of C3-30-alkylene are replaced by a heteroatom independently selected from the group consisting of O, S, 5 NH, N-C1-30-alkyl, N-C6-14-aryl and N-C7-30-aralkyl, wherein alkyl and aryl fragments of N-C1-30-alkyl, N-C6-14-aryl, N-C7-30-aralkyl may at least be monosubstituted by hydroxyl, halogen, -CF3, NH2, -NH-C1-6-alkyl, -NH- phenyl, -N(C1-6-alkyl)2, -N(phenyl)2, -SH, -S-C1-6-alkyl, -S-phenyl, -O-C1-6-alkyl or -O-phenyl, to process for the preparation of the bismuth containing catalyst, to a process for the preparation of a compound, oligomer or polymer comprising at least one urethane group using the bismuth-containing catalyst, to a composition comprising (i) at least one monoalcohol (B1) or polyol (B2), (ii) at least one polyisocyanate (A) and (iii) the bismuth-containing catalyst, to a coating or adhesive layer formed from the composition on a substrate, to a foam formed from the composition, and to the use of the bismuth-containing catalyst in for preparing compounds, oligomers or polymers comprising a urethane group, as esterification and transesterification catalyst and as catalyst for ring-opening polymerizations of lactones and epoxides.

The invention discloses a bimetallic oxide supported catalyst as well as a preparation method and application thereof. The bimetallic oxide supported catalyst comprises a bimetallic oxide carrier and a metal active component supported on the surface of the bimetallic oxide carrier; the bimetallic oxide carrier contains a divalent metal element oxide and a trivalent metal element oxide; the divalent metal element oxide is selected from at least one of oxides of Mg, Ca, Sr, Zn and Mn; the trivalent metal element oxide is selected from at least one of oxides of Al, In, Fe, Cr and Ce; the metal active component is selected from at least one of Pd, Pt, Ru, Ni and Co; in the bimetallic oxide supported catalyst, the mass of the metal active component is 0.1-20 wt% of the mass of the metal oxide carrier.

The application belongs to the technical field of biology and particularly relates to a kind of biomimetic enzyme and its application in degrading aflatoxin.The raw material of the biomimetic enzyme includes polypeptide and divalent copper ion, the sequence of the polypeptide is shown in SEQ ID No.1, specifically: Ac-HCHLKLKLKL-CONH2, the N terminal of the polypeptide is acetylated, and the C terminal is amidated.The biomimetic enzyme is constructed by sequencing design and metal coordination to construct an active site, is stable in catalyzing AFB1 rupture in wide pH and temperature, has the advantages of good tolerance, high catalytic efficiency, and has potential application advantages in the application in grain and feed purification.

A polycarbonate resin composition containing 16-63% by mass of a repeating unit (a) represented by formula (1) and 37-84% by mass of a repeating unit (d) represented by formula (6), the polycarbonate resin composition having a viscosity average molecular weight of 15000 or more, and having a viscosity average molecular weight of 15000 or more. (In formula (1), R1 and R2 each independently represent a hydrogen atom or a methyl group) (in formula (6), R15-R18 each independently represent a hydrogen atom, a C1-10 alkyl group, or a C6-12 group including an aryl group, and W represents at least one selected from the group consisting of a single bond, an oxygen atom, a sulfur atom, a sulfinyl group, a sulfonyl group, and a divalent organic group).

This invention discloses a method for precipitation separation and ceramic solidification of divalent strontium and tetravalent uranium in radioactive waste liquid, relating to the field of radioactive waste liquid treatment and disposal. U in high-level radioactive waste liquid is in the form of hexavalent uranyl (UO2). 2+ U exists in the form of hydrogenation catalytic reduction, and the present invention uses hydrogenation catalytic reduction to prepare U. 4+ Sr 2+ and U 4+ ionic radius and Ln 3+ Due to the significant differences, CePO4·0.667H2O cerium phosphate, which has a stronger nuclide-containing capacity, was selected as the co-precipitation enrichment agent for Sr. 2+ and U 4+ Separation precipitant. Inexpensive raw materials such as UO2(NO3)2·6H2O, Sr(C2H3O2)2, NH4H2PO4, and Ce(NO3)3·6H2O are selected. By controlling the Sr... 2+ :U 4+ Ion ratio, reaction time, temperature, pH, and preparation of well-developed Sr crystals 2+ / U 4+ The precipitate of cerium phosphate solid solution with high solid content is avoided by using spark plasma solid-state sintering technology to prevent grain agglomeration and adhesion during high-temperature dehydration and crystal transformation of cerium phosphate. Furthermore, pressure sintering can promote further growth of nanocrystals and promote U... 4+ and Sr 2+ Homogenization within the monazite ceramic solidified body enables a one-step preparation of monazite ceramic solidified body from a lanthanite solid solution.

The invention relates to the field of glass detection, and particularly discloses a method for testing the content ratio of ferrous iron to ferric iron in glass. The method specifically comprises the following steps: washing a to-be-detected glass sample, grinding into micro powder, drying, respectively taking the same amount of glass micro powder, and marking as a sample 1 and a sample 2; divalent iron can be converted into ferric iron by adding perchloric acid into the sample 1, and the test result is the content of total iron in the glass. And dimethyl silicone oil is added into the sample 2 so as to isolate air and prevent ferrous iron from being oxidized into ferric iron in the testing process to influence the experiment result. According to the method, the proportion of Fe < 2 + > to Fe < 3 + > in an unknown glass sample can be simply and quickly obtained, the result is accurate and reliable, the test period is short, and the working efficiency is greatly improved.

The invention relates to a ZnAl-LDH-based material as well as a preparation method and application thereof in sludge treatment. The ZnAl-LDH-based material is prepared from a divalent metal salt solution and a trivalent metal salt solution through a coprecipitation method, divalent metal comprises Zn and Cu, and trivalent metal is Al; the molar weight ratio of the divalent metal to the trivalent metal is (1-3): 1, and the ratio of the molar weight of Cu to the total molar weight of the divalent metal is (0-0.5): 1. The ZnAl-LDH-based material is used for promoting the organic sulfide in the sludge to be converted into sulfoxide sulfur and sulfone sulfur. Compared with the prior art, a series of ZnAl-LDH-based materials with proper specific surface areas and pore volume structures are prepared, and low-valence organic sulfides in municipal sludge can be promoted to be directionally converted into sulfoxide sulfur and sulfone sulfur; the method has a wide application prospect in the field of improving the high-added-value utilization of organic sulfide-containing wastes such as municipal sludge.

The present application relates to a kind of nanodroplet system based on interface crosslinking curcumin and its preparation method, by the crosslinking complexation between gallic acid ester, metal ion, curcumin to construct nanodroplet system.Gallic acid ester is polyphenol compound, contains a large number of phenolic hydroxyl in structure, has strong chelating metal ability, can be complexed with most of trivalent metal ions and divalent excessive metal ions, called metal phenolic network;Metal ions such as copper, iron and other metal ions form complex by electrostatic interaction with the beta diketone group in the structure of curcumin.Therefore, the nanodroplet system constructed by the present application can maintain the chemical stability and light stability of curcumin, and has wide prospect for improving the current food field curcumin low solubility, poor stability and other problems.

The application discloses a method for synthesizing tervalent tetraaryl iron porphyrin from pyrrole, aromatic aldehyde and ferrous salt, which comprises the following steps: adding anhydrous aluminum chloride, aromatic aldehyde, pyrrole and ferrous salt into DMF under stirring, and then heating and refluxing the reaction mixture for 0.5 hours under nitrogen; removing the nitrogen and continuing to heat the reaction mixture for a certain time; stopping the reaction; cooling the reaction mixture; and placing the reaction mixture at 273K overnight; and finally filtering the reaction mixture to obtain the iron porphyrin.

To provide a curable composition from which a cured product having good tensile strength and excellent tear strength is obtained, a cured product of the curable composition, and a method for producing the cured composition.SOLUTION: A curable composition comprising a polymer A and a polymer B, wherein the polymer A has two or more terminal groups in one molecule, and the terminal groups do not have a divalent organic group represented by - C (= O) NH - and have at least one group selected from the group consisting of a reactive silicon group, an unsaturated group, and a hydroxyl group, the polymer A is an oxyalkylene polymer having a silylation ratio of 85 to 100 mol%, and the polymer B is an oxyalkylene polymer having two or more terminal groups per molecule, the terminal groups each having at least one group selected from the group consisting of a reactive silicon group, an unsaturated group, and a hydroxy group, the average total number of reactive silicon groups, unsaturated groups, and hydroxy groups per terminal group being more than 1.0, and the silylation ratio of the polymer B being smaller than the silylation ratio of the polymer A.SELECTED DRAWING: None

This invention provides a method for forming a perovskite material from multiple evaporation sources. [Solution] In the present invention, (i) a first evaporation source comprising a mixture of co-sublimable organic halides, and (ii) a second evaporation source comprising one or more metal halides having the following formula (I), wherein B(X y X' 1-y )2(i) a method is provided which comprises the steps of co-sublimating a second evaporation source, where B is a divalent metal cation, X and X' are different halides, 0 ≤ y < 1, and (iii) one or more different organic halides from one or more other evaporation sources, and / or (iv) one or more inorganic halides from one or more other evaporation sources, wherein the perovskite material comprises three or more different cations in addition to the B cation.

Toner comprising a toner particle containing a binder resin, wherein the toner particle comprises a condensation product of an organosilicon compound, in time-of-flight secondary ion mass spectrometry (TOF-SIMS) of the toner particle, a normalized intensity of silicon ions (m / z 28) originating from the condensation product of the organosilicon compound, given by the following expression (I), of 7.00×10 -4 up to 3.00×10 -2 amounts; Normalized intensity λt of silicon ions (m / z 28) = {Ionic intensity λt (m / z 28) of silicon ions} / {Gesmation intensity λt from m / z 0.5 to 1850} a normalized intensity of silicon ions (m / z 28) by time-of-flight secondary ion mass spectrometry after sputtering the toner particles with an Ar-gas cluster ion beam Ar-GCIB under the following condition (A) 6.99×10 -4or less; (A) Acceleration voltage: 5 kV, Current: 6.5 nA, Grid size: 600×600 µm, Irradiation time: 5 seconds / cycle, Sputtering time: 250 seconds, the toner contains fine particles on the surface of the toner particles, and The fine particles of a polyvalent acid metal salt are a reaction product of a compound comprising at least one of the elements Ti and Al, and a polyvalent acid. wherein the condensation product of the organosilicon compound is a silane-modified resin R with the structure represented by the following formula (1); in formula (1) P 1 represents a styrene-acrylic resin segment or a polyester resin segment; L 1 represents a single bond or a divalent compound group; R 1 to R 3Each independently represents a hydrogen atom, a halogen atom, an alkyl group with 1 or more carbon atoms, an alkoxy group with 1 or more carbon atoms, an aryl group with 6 or more carbon atoms, or a hydroxy group; and m represents a positive integer; in a case where m is equal to or greater than 2, a plurality of L 1 , a plurality of R 1 , a plurality of R 2 and a plurality of R 3 each may be identical or different; however, Si is bonded to at least one carbon, and at least one of R 1 to R 3 is condensed with an organosilicon compound.

A composition for forming an organic film containing (A) a resin or compound for forming an organic film, (B) a compound represented by the general formula (1), and (C) a solvent,wherein R1 is a terminal group represented by the general formula (2), X is an n1-valent organic group having 2 to 50 carbon atoms, and n1 represents an integer of 2 to 8,wherein R2 is a monovalent organic group, wherein the monovalent organic group contains at least any of structures having fluorine atoms represented by the general formula (3), m1 is 1 or 2, wherein when m1 is 1, Z represents a single bond or a divalent organic group optionally containing a heteroatom, and when m1 is 2, Z represents a trivalent organic group optionally containing a heteroatom,

A luminescent substance (1) having the empirical formula EA2-xSExSi5 -xAlxN8:RE is specified, where - EA is an element or a combination of elements selected from the group of divalent elements, - SE is an element or a combination of elements selected from the group of rare earth elements, - RE is an activator element, and - 0 ≤ x ≤ 2. Also specified is a method for producing a luminescent substance (1), and an optoelectronic component (10).

An amino compound represented by formula (1) and a method for producing the same, an epoxy resin curing agent containing the amino compound, an epoxy resin composition, and a cured product thereof: R1—NH—X—NH—R2 (1) wherein R1 and R2 are each independently a hydrogen atom or a monovalent group represented by formula (2), at least one of R1 and R2 is a monovalent group represented by formula (2), X is a divalent group represented by —CH2—A—CH2— (A is a cyclohexylene group), —(CH2)n—, —(CH2CH2NH)m—CH2CH2—, or a divalent group represented by formula (3) or (4), n is 2 to 6, and m is 1 or 2,wherein a dashed line indicates presence or absence of a π bond, R3 to R5 are each independently a hydrogen atom or an alkyl group that has 1 to 4 carbon atoms and optionally has a hydroxy group, and * represents a bonding position

The present invention provides a water-repellent agent composition which contains a polymer (A) having a repeating unit that is derived from a silicon-containing monomer represented by formula CH2=C(-Ra)-X-SiZ3 (in the formula, Ra represents a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, X represents a divalent group that is composed of one or more selected from the group consisting of X1 and X2, X1 represents a group that is composed of one or more selected from the group consisting of -O-, -C(=O)-, and -NR'- (wherein each R' independently represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms), X2 represents a divalent aliphatic hydrocarbon group having 1 to 40 carbon atoms, each Z independently represents a hydrocarbon group having 1 to 10 carbon atoms or –(O-SiZ1 2)n-O-SiZ2 3, each Z1 independently represents a hydrocarbon group having 1 to 10 carbon atoms or -OSiZ11 3, each Z11 independently represents a hydrocarbon group having 1 to 10 carbon atoms or -OSiZ111 3, each Z111 independently represents a hydrocarbon group having 1 to 10 carbon atoms, each Z2 independently represents a hydrocarbon group having 1 to 10 carbon atoms or -OSiZ21 3, each Z21 independently represents a hydrocarbon group having 1 to 10 carbon atoms or -OSiZ211 3, each Z211 independently represents a hydrocarbon group having 1 to 10 carbon atoms, and each n independently represents an integer of 0 to 196) and a dispersant (B), wherein: the polymer (A) contains the repeating unit that is derived from the silicon-containing monomer in an amount of 90% by weight or more based on the weight of the polymer (A); and polymer (A) has a number average molecular weight of 60,000 to 4,000,000 inclusive. The water-repellent agent composition is capable of imparting both good water repellency and good slip resistance to a base material (particularly, a fiber product).

The invention provides a method for removing ferrous iron in a nickel chloride solution through efficient oxidation promotion, belongs to the technical field of purification treatment of chlorination system solutions, and solves the problem that free ferrous iron in the nickel chloride solution cannot be effectively oxidized and converted into ferric iron in the prior art. Controlling the concentration of main metal nickel ions, and adding a corresponding amount of hydrogen peroxide into the nickel chloride solution for stirring according to the content of impurity Fe in the nickel chloride solution; injecting the stirred nickel chloride solution into an electrolytic bath, heating, and raising the temperature of the nickel chloride solution in the bath; and the cathode and the anode in the electrolytic bath are conducted, and the introduced nickel chloride solution is subjected to electrolytic treatment, so that divalent iron in the nickel chloride solution can be converted into trivalent iron. The process flow is simple, the production process is easy to control, the facility equipment investment is low, and the final benefit is remarkable.

The invention belongs to the technical field of pollutant treatment, and particularly relates to a Cu < 2 + >-mediated method for degrading neonicotinoid pollutants in a water body, which comprises the following steps: S1, adjusting the initial pH value of the water body containing the neonicotinoid pollutants to 6.0-9.0; s2, adding bivalent copper ions Cu < 2 + > and hypochlorous acid HOCl into the water body, and reacting for 12-48 hours; the concentration of bivalent copper ions Cu < 2 + > is not higher than 1mg / L, and the concentration of hypochlorous acid HOCl is not higher than 10mg Cl2 / L. Compared with the prior art, the induction mechanism of Cu < 2 + > on free radical oxidation of the neonicotinoid pollutants is clarified, the degradation speed and the total degradation rate of the neonicotinoid pollutants are improved by utilizing Cu < 2 + >, the degradation rate of the neonicotinoid pollutants after 6 hours exceeds 60%, and the degradation rate of the neonicotinoid pollutants after 36 hours can reach 99%.

The present invention addresses the problem of providing a resin composition that provides a cured product exhibiting excellent dielectric properties and excellent adhesion. [Solution] A resin composition containing (1A) a polymer having a structural unit represented by formula (A-1) and a structural unit represented by formula (A-2), (B) an epoxy resin, and (C) an inorganic filler. (In formula (A-1) and formula (A-2), R1 each independently represents a monovalent organic group having an atom selected from the group consisting of a carbon atom, a hydrogen atom, an oxygen atom, a nitrogen atom, a silicon atom, and a sulfur atom as a constituent atom, R1 has a molecular weight of 250 or more, R1 does not have an ethylenically unsaturated group, and R1 does not contain at least one of a triazine skeleton and an optionally hydrogenated bisphenol skeleton. Each A independently represents a divalent organic group having a bisphenol skeleton that may be hydrogenated. )

An aqueous composition including (a) metal ions including tin ions and silver ions and (b) at least one complexing agent of formula C11RC12-XC11-RC11   (C11)and their salts,whereXC11 is selected from(a) a divalent 5 or 6 membered aromatic N-heterocyclic group;(b) a divalent 6 membered aromatic carbocyclic group; and(c) a divalent 5 or 6 membered aliphatic N-heterocyclic group including one N atom and optionally a second heteroatom selected from N and O; all of which may be unsubstituted or substituted by one or more OH or one or more RC14;RC11 is selected from ; andRC12 is selected from RC11, XC11-RC11, H, OH, NRC142, C1 to C10 alkyl, and C1 to C10 alkoxy

The invention discloses a method for testing the content of trivalent metal elements in a metal oxide, and belongs to the technical field of chemical analysis. The method comprises the following steps: firstly, reducing trivalent metal elements in a sample into divalent metal elements by using a reducing agent ammonium ferrous sulfate in a strong acid environment, wherein unreacted ammonium ferrous sulfate remains in a system; then, potassium permanganate is adopted for titration of unreacted ammonium ferrous sulfate, the end point is based on the fact that the solution becomes light pink and keeps color fastness for 15 seconds, and meanwhile a blank solution is set to eliminate system background interference; by comparing the difference between the blank titration volume and the sample titration volume and combining the titration concentration and the sample mass, the content of the trivalent metal elements in the sample can be accurately calculated. The method has the advantages of simplicity and convenience in operation, strong anti-interference capability, high detection precision and wide application range, is suitable for various metal oxide material systems, and is particularly suitable for quality control and performance analysis of new energy materials and catalysts.