592 results about "Acid group" patented technology

The invention relates to an organic compound, a solar cell and application thereof. The organic compound is shown as a formula (1), wherein Ar is selected from any one of substituted or unsubstituted aryl with the ring-forming atom number of 6-50, substituted or unsubstituted heteroaryl with the ring-forming atom number of 5-50, a group shown as a formula (A) and a group shown as a formula (B), Ar'is selected from an electrically neutral organic group, and L is selected from a paraffin subunit with the carbon atom number of 1-10; r1 is an oxyacid group; n1 is selected from any integer of 1-3, and m1 is selected from any integer of 1-10; or the organic compound is an oxyacid radical salt of the compound as shown in the formula (1). The organic compound not only can be used as a passivation material, but also can be used as a hole transport material, and can improve the photoelectric conversion efficiency of a solar cell when being applied to preparation of the solar cell.

The invention discloses application of small molecules containing diphosphonic acid groups in preparation of hydrophilic inorganic nanoparticles, and relates to the technical field of preparation of inorganic nanoparticles. The method comprises the following steps: dispersing inorganic nanoparticles coated with a hydrophobic organic compound on the surface into tetrahydrofuran, dropwise adding into a small molecule solution containing a diphosphonic acid group, uniformly mixing, and adding diethyl ether to prepare the hydrophilic inorganic nanoparticles. The method is simple and convenient to operate, mild in condition, rapid in conversion, high in conversion rate, energy-saving and efficient, and the converted nano-particle freeze-dried powder is stable in property and easy to store and transport and has certain popularization value. The problems that in the prior art, an inorganic nanoparticle hydrophilic modification method is complex, and conversion efficiency is low are solved.

The invention provides a battery positive plate and a battery. The battery positive plate comprises a positive active material and a binder, and the binder is a product obtained by crosslinking a phenylboronic acid compound modified polyacrylic acid compound and a hydroxylated carbon nanotube. According to the battery positive plate, a three-dimensional conductive network binder based on crosslinking of a phenylboronic acid compound modified polyacrylic acid compound and a hydroxylated carbon nanotube is adopted, and the binder utilizes a multi-crosslinking mechanism between a phenylboronic acid group and the hydroxylated carbon nanotube (OHCNT) and between the phenylboronic acid group and positive active particles; a boroxane structure is formed through self-crosslinking of the boron oxide and the phenylboronic acid, and a special three-dimensional conductive network structure is formed, so that the mechanical strength and the conductivity of the binder and the cycle performance and the stability of the battery are improved; the discharge performance and the rapid charge-discharge capability of the battery can be improved, and the consumption of electrolyte can be reduced, so that the cycle life of the battery is prolonged.

The invention provides a method for accurately regulating and controlling pores of an MXene material by utilizing a phosphonic acid ligand, which mainly comprises the following key steps of: directionally removing a main group element (A) layer of an MAX precursor by wet etching to obtain lamellar MXene, and then introducing a protonated quaternary amine compound intercalator to strip the MXene. And finally, carrying out functional modification and conversion by adopting a phosphonic acid ligand, and stably introducing phosphonic acid groups between layers and on the surface of MXene through solvothermal reaction to realize accurate regulation and control of interlayer spacing. The prepared material can realize efficient adsorption of uranyl in an acidic environment, shows high selectivity, high adsorption capacity and good acid stability and regeneration capacity to uranyl, provides a stable and efficient selective adsorption solution for treating high-acidity uranium-containing nuclear wastewater, and has a remarkable industrial application prospect.

Provided is a photosensitive resin composition having excellent low-temperature curability and capable of providing a cured resin film having sufficient solvent resistance or sufficient hardness. Also, provided are a color filter having excellent solvent resistance or excellent hardness, and an image display element having same. A photosensitive resin composition according to the present invention contains a copolymer (A), a reactive diluent (B), a photopolymerization initiator (C), and a solvent (D).　The copolymer (A) contains a structural unit (a), a structural unit (b), and a structural unit (c). The structural unit (a) has at least one selected from among an active methylene group having an alkoxycarbonyl group attached thereto, and an active methine group having an alkoxycarbonyl group attached thereto. The structural unit (c) has an acid group.

The invention relates to the field of water treatment, and discloses a scale and corrosion inhibitor for seawater circulating cooling water, which is prepared from phosphonic acid grafted maleic anhydride-acrylic acid copolymer, hydroxyethylidene diphosphonic acid, amino trimethylene phosphonic acid, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N-dimethylformamide, N, N- The anti-corrosion coating is prepared from the following raw materials: N, N-diethylaminomethyl-benzotriazole, gamma-aminopropyltriethoxysilane, zinc salt and a polyoxyethylene-polyoxypropylene block copolymer. The core of the invention is that all the raw material components form the thermo-sensitive polyelectrolyte compound through a self-assembly process. The compound is stably dispersed at low temperature by utilizing the cloud point effect of the block copolymer, and is subjected to phase change and preferential deposition on a high-temperature heat exchange surface, so that targeted and efficient delivery of various active components is realized. According to the invention, the problems of incompatibility of components and poor stability of a traditional compound agent are solved, the product has excellent storage stability, and efficient and synergistic corrosion and scaling control can be realized under high-temperature and high-salinity working conditions.

The invention discloses a preparation method of a lignite resin drilling fluid filtrate reducer, and relates to the technical field of petroleum and natural gas drilling engineering. The method comprises the following steps: carrying out superfine grinding on lignite, carrying out alkaline hydrolysis pretreatment on waste nylon PA66, alkalizing lignite powder, carrying out sulfonation reaction on the alkalized lignite powder and phosphorous acid to introduce phosphonic acid groups, carrying out cross-linking with tetrabutyl titanate to form a three-dimensional network structure, and adding a nano-montmorillonite suspension to realize physical enhancement. A reaction product is subjected to freeze-drying, a porous structure is reserved, and then the product and polyethylene glycol 400 are mixed and granulated. By utilizing humic acid functional group grafting, inorganic-organic composite cross-linking and waste raw material recycling technologies, the product still keeps excellent filtration loss control capability at the high temperature of 200 DEG C and in a saturated salt solution, the high-temperature and high-pressure filtration loss is less than or equal to 6.50 mL, the viscosity retention rate is greater than or equal to 92.8%, the lubricating coefficient reduction rate is greater than or equal to 48.5%, and the product has the advantages of temperature resistance, salt resistance, environmental protection and low cost, and is suitable for industrial production. And the method is suitable for deep oil-gas drilling engineering.

This proton conductive electrolyte material has a chemical structure which comprises an acidic polymer (2) that contains an oxo acid group represented by -POx(OH)y (wherein x and y are each 1 or more), having a phosphorus atom, and at least one saturated hydrocarbon group in the main chain, and a basic polymer (3) that contains a basic functional group, while having at least one aromatic ring in the main chain, wherein an attractive interaction occurs between the oxo acid group and the basic functional group. This fuel cell is provided with the proton conductive electrolyte material. This method for producing a proton conductive electrolyte material includes: preparing a first solution by means of an acidic polymer and a mixed solvent; preparing a second solution in which a basic polymer is dissolved in a solvent; and preparing a mixed solution in which the first solution and the second solution are mixed. With respect to the preparation of the first or second solution, a mixed solvent which contains an inhibitor that is capable of inhibiting rapid aggregation of the oxo acid group and the basic functional group is prepared.

The present invention relates to an anti-fouling, semi-permeable membrane comprising a porous support layer, a thin film composite (TFC) layer formed on a surface of the support layer, and a cross-linked polyvinyl alcohol (PVA) layer formed on top of the TFC layer, wherein the cross-linked PVA layer is the reaction product of PVA and a cross-linking agent, said cross-linking agent being a polybasic acid comprising three or more acid groups or precursors thereof. The obtained membrane shows a high water flux and a low roughness suitable for an effective membrane notable for feed solution having a tendency of fouling the membrane.

Processing aids and lubricants with free acid groups and relatively high molecular weights are used as process aids in the formation of extrudates and other molded materials. The compositions of this invention can be used as defined, or can be used with prior art processing aids, depending on the end use application. The novel materials and process provide a useful alternative to the sole use of fluorine-based polymer processing aids.

A pigment dispersion liquid containing a copolymer (A) having a first segment (a1) derived from a nitrogen-containing polymerizable unsaturated monomer having a tertiary amino group and / or a nitrogen-containing heterocyclic group, and a second segment (a2) derived from a polymerizable unsaturated monomer having a polyoxyalkylene chain, a hydrocarbon group-containing acidic compound (B), a pigment (C), and an aqueous solvent (D), and a hydrocarbon group-containing acidic compound (B) having a C5-23 saturated or unsaturated hydrocarbon group (b1) and at least one acid group (b2) selected from the group consisting of a carboxyl group, a phosphate group, a sulfonic acid group, and a phenol group.

The invention belongs to the technical field of fluorescent probes, and particularly discloses a high-sensitivity visual Fe < 3 + > / Al < 3 + > fluorescent probe Rh and a preparation method and application thereof.The high-sensitivity visual Fe < 3 + > / Al < 3 + > fluorescent probe Rh is characterized in that cyanuric chloride and sulfanilic acid are used as raw materials, and an intermediate L1 is synthesized through an alkylation reaction; synthesizing an intermediate L2 by using the intermediate L1 and p-hydroxybenzaldehyde as raw materials through alkylation reaction; the intermediate L2 and rhodamine B hydrazide are subjected to a Schiff base reaction, and the triazine-rhodamine B hydrazide derivative fluorescent probe Rh is obtained. According to the fluorescent probe Rh prepared by the invention, the water solubility is increased due to the introduction of a sulfanilic acid group; the fluorescence spectrum test of the probe Rh and 17 common metal ions shows that the probe Rh has a remarkable fluorescence enhancement effect on Fe < 3 + > and Al < 3 + >; an ultraviolet-visible absorption curve test shows that a new peak appears at 560 nm, the absorbance is remarkably increased, and at 350 nm, Fe < 3 + > has an obvious absorption peak but Al < 3 + > does not exist, and Fe < 3 + > and Al < 3 + > can be distinguished.

The invention belongs to the technical field of batteries, particularly relates to the technical field of lithium ion batteries, and particularly relates to a non-aqueous electrolyte which comprises a compound shown in a formula I and a compound shown in a formula II, in the formula I, R1, R2, R3 and R4 are independently selected from any one of a fluorine atom, a difluorophosphoryloxy group, a methanesulfonic acid group and a trifluoromethanesulfonic acid group respectively, and R1, R2, R3 and R4 are independently selected from any one of a fluorine atom, a difluorophosphoryloxy group, a methanesulfonic acid group and a trifluoromethanesulfonic acid group; in the formula II, R5, R6, R7 and R8 are respectively and independently selected from any one of fluorine atoms, trifluoromethyl, and C1-C3 alkyl sulfonic acid groups which are substituted by fluorine atoms or not substituted by fluorine atoms; based on the total mass of the non-aqueous electrolyte, the mass percentage of the compound in the formula I is A, the mass percentage of the compound in the formula II is B, A is more than or equal to 0.01% and less than or equal to 10%, B is more than or equal to 0.05% and less than or equal to 5%, and A / B is more than or equal to 0.01 and less than or equal to 50. According to the present invention, the compound represented by the formula I and the compound represented by the formula II are matched for use in the electrolyte, such that the cycle performance and the high-temperature storage performance of the electrochemical device can be simultaneously improved.

The invention relates to the technical field of all-vanadium redox flow batteries, and discloses a supported electrolyte of all-vanadium redox flow battery positive and negative electrolyte and a preparation method thereof, and the supported electrolyte comprises an aqueous solution containing vanadium ions, sulfonate ions, sulfate ions and phosphonic acid groups. The sulfonic acid group (-SO3H) has strong polarity and high ionization degree, after the sulfonic acid group (-SO3H) is mixed with the phosphonic acid group (-PO3H2) and sulfuric acid, the ionic environment of the electrolyte can be optimized, the activation energy of V (II) / V (III) and V (IV) / V (V) electricity on electron transfer is reduced, and compared with an existing sulfuric acid supported electrolyte, the reversibility of electrochemical reaction is remarkably improved, and the electrochemical activity of the electrolyte is enhanced; meanwhile, phosphonic acid groups have high complexing ability, can form stable chelates with vanadium ions and can form complexing-dispersing synergy with sulfonic acid groups, the solubility of the vanadium ions is improved, and agglomeration and crystallization of the vanadium ions are inhibited.

One embodiment of the present invention relates to: a composition containing particles having a refractive index of 1.8 or more, a polymer compound represented by formula (1), and a solvent; a liquid crystal film, a film or a display device using the composition; and a dispersant containing a polymer compound represented by formula (1). In formula (1), the whole has one or more mesogenic structures, and m + n satisfies 2-10. A1 represents at least one group selected from the group consisting of an acid group, a urea group, a urethane group, a group having a coordinating oxygen atom, a group having a basic nitrogen atom, a phenol group, an alkyl group, an aryl group, a group having an alkyleneoxy chain, an imide group, an alkoxycarbonyl group, an alkylaminocarbonyl group, a carboxylate group, a sulfonamide group, a heterocyclic group, an alkoxysilyl group, and an epoxy group; and P1 represents a polymer chain, a monovalent group of a group selected from the group consisting of an isocyanate group and a hydroxyl group. # imgabs0 #

The purpose of the present invention is to provide a method for forming a multilayer coating film which makes it possible to form a multilayer coating film having excellent metallic mottling resistance. The method for forming a multilayer coating film comprises: (1) a step for applying a first aqueous coating material (P1) on an object to be coated to form a first coating film; (2) a step for applying a second aqueous colored coating material (P2) on the first coating film to form a second colored coating film that contains a binder component (AP2) and lustrous pigment (BP2); (3) a step for applying a clear-coat coating material (P3) on the second colored coating film to form a clear-coat coating film; and (4) a step for heating a multilayer coating film that includes the first coating film, the second colored coating film, and the clear-coat coating film so as to cure the multilayer coating film all at once. The first aqueous coating material (P1) contains a compound (A) containing a hydroxyl group and an acid group and that has an acid value of from 50 to 150 mg KOH / g, a hydroxyl value of from 100 to 300 mg KOH / g, and a weight-average molecular weight of from 500 to 8000, a film-forming resin (B), and a crosslinking agent (C).

The invention relates to the technical field of admixtures for cement concrete, in particular to a polycarboxylic acid admixture for enhancing low-activity admixtures and a preparation method thereof, the polycarboxylic acid admixture is formed by polymerizing the following components: polyether macromonomer, unsaturated carboxylic acid I, exciting functional monomer A, slump retaining functional monomer B, rheological functional monomer C, oxidizing agent, reducing agent, chain transfer agent and water; the exciting functional monomer A, the slump retaining functional monomer B and the rheological functional monomer C are sequentially added, and the exciting functional monomer A is formed by polymerizing polyhydric alcohol, unsaturated carboxylic acid II, an initiator, phosphonic acid and an alcohol amine small monomer. Through molecular design, key functional groups such as phosphonic acid groups, amino groups and sulfonic acid groups are innovatively introduced into a polycarboxylic acid main chain, so that the polycarboxylic acid admixture has multiple synergistic functions of reducing the cement consumption, effectively activating a low-activity cementing material, stably improving the working performance of concrete and the like.

The invention provides a viscosity reduction type water reducer as well as a preparation method and application thereof. The water reducer is prepared by the following steps: firstly, alternately polymerizing styrene and maleic anhydride to obtain a low-molecular-weight styrene-maleic anhydride polymer, and then respectively grafting a phosphonic acid monomer and a polyether monomer into a main chain of the styrene-maleic anhydride polymer through reaction, the number average molecular weight of the styrene-maleic anhydride polymer is 1000 to 2000. Through an esterification reaction, a phosphonic acid monomer and a polyether monomer are grafted to a main chain formed by a styrene-maleic anhydride alternating polymer, and a phosphonic acid group and a hydrophobic epoxypropane structural unit are introduced into a water reducing agent structure, so that the surface tension of the water reducing agent is further reduced; the wetting effect and a certain air entraining effect of the water reducing agent on cement particles are improved, the sliding resistance among the cement particles is reduced, and the viscosity of concrete is reduced to a certain extent.

The invention discloses a low molecular weight composite anti-pollution agent for well cementation, and relates to the technical field of oilfield chemistry, the low molecular weight composite anti-pollution agent is prepared by mixing the following components by mass: 60-85 parts of a low molecular weight phosphonic acid polymer solution, 15-40 parts of a silicate solution, the silicate solution is a low modulus silicate solution with a mass fraction of 25%-45%, and the balance of water. The low-molecular-weight phosphonic acid polymer solution is a polymer solution with the mass fraction of 35%-60% prepared from a phosphonic acid group-containing monomer, a rigid group-containing monomer and a carboxylic acid group-containing monomer; according to the present invention, the stable slurry can be formed after the drilling fluid is added, the anti-pollution requirement can be met under the low addition amount condition, the use amount of the spacer fluid can be significantly reduced, and compared with the traditional retarder type anti-pollution agent for prolonging the thickening time by using the retarding effect, the anti-pollution agent has the good anti-pollution effect; the method also has very obvious effects on inhibiting the phenomena of swelling and core wrapping and reducing the consistency of polluted mixed slurry.

The invention relates to the technical field of blood purification materials, in particular to a zirconium-titanium bimetal MOF hollow microsphere adsorbent and a preparation method and application thereof. The adsorbent is based on a Zr / Ti bimetallic node and a phosphonic acid-carboxylic acid mixed ligand, a composite MOF hollow microsphere structure with high stability and high specific surface area is constructed through a solvothermal and polymerization synergistic reaction in a water-in-oil suspension system, a phosphonic acid group and Zr are strongly coordinated to improve the stability of a framework, and the composite MOF hollow microsphere structure has a high specific surface area. The carboxylic acid group keeps the hydrophilicity of the pore channel; meanwhile, a cross-linked network of acrylamide and N, N '-methylene bisacrylamide penetrates through crystal gaps in the balling process, so that the material has excellent mechanical strength and fluid stability; and a sulphobetaine amphoteric polymer brush layer is constructed on the surface of the MOF through endogenous initiation point modification and surface in-situ controllable free radical polymerization technologies, so that protein adsorption and platelet adhesion are effectively inhibited, the blood compatibility is remarkably improved, and meanwhile, the channel accessibility is maintained to promote rapid diffusion and adsorption of bilirubin.

The problem to be solved by the present invention is to provide an aqueous pigment dispersion that can maintain superior dispersibility and long-term storage stability, and that can be used for producing printed matter superior in color development in printing on plain paper. The present invention relates to an aqueous pigment dispersion that contains a pigment including C.I. pigment red 150, a water soluble organic solvent, and a radical polymer having an aromatic ring structure or a heterocyclic structure and having an acid value of 50 to 120 mgKOH / g, acid groups in the radical polymer being partially or entirely neutralized with a basic compound, the radical polymer being contained at a mass ratio to the pigment in the range of 0.001 to 0.1.

The invention relates to the technical field of polyamide nanofiltration membranes, in particular to an acid and alkali resistant high-strength nanofiltration membrane and a preparation method thereof. The problem that the strength and the acid and alkali resistance of a polyamide nanofiltration membrane in the prior art cannot be considered at the same time is solved. The base membrane material of the polyamide nanofiltration membrane is modified polyethersulfone and is obtained by chemically bonding a carbon nanotube subjected to double surface modification by titanium dioxide sol-gel and a KH550 coupling agent in a polyester non-woven fabric, and the modulus of the material is improved by utilizing an inorganic-organic hybrid network; the functional layer of the polyamide nanofiltration membrane is made of modified polyamide, and the modified polyamide functional layer is formed by forming a polyamide matrix through polymerization reaction of 2, 2 '-disulfonic acid-4, 4'-diaminobiphenyl, piperazine and trimesoyl chloride and introducing 4-amino-2, 2, 6, 7-tetramethyl-1, 3-pentanediol at the same time. And the chemical resistance is improved by a free radical capturing group generated by 2, 2, 6, 6-tetramethylpiperidine and octa-isobutyl cage type silsesquioxane.

The invention relates to the technical field of adsorbents, and provides an efficient molecular sieve adsorbent for adsorbing carbon dioxide and a preparation method of the efficient molecular sieve adsorbent aiming at the problem that a traditional Na-type 13X molecular sieve is poor in CO2 adsorption performance under low partial pressure. The adsorbent is prepared by using a template agent, aluminum hydroxide, nano aluminum oxide and silica sol as raw materials through the steps of crystallization, calcination and the like. The template agent is a functional molecule integrating a phosphonic acid group, long-chain alkyl and polyethylene glycol dicarboxylic acid, the phosphonic acid group stabilizes a skeleton, the long-chain alkyl provides a graphene-like layer to inhibit water molecule adsorption, and the polyethylene glycol dicarboxylic acid guides micropores to grow orderly and cooperate with each other to form the efficient molecular sieve adsorbent for carbon dioxide adsorption. The CO2 adsorption capacity, the dynamic adsorption rate and the moisture resistance of the adsorbent under low partial pressure are improved.

To provide an aqueous polyurethane resin dispersion which is excellent in both strength and flexibility, when being formed on a base material.SOLUTION: An aqueous polyurethane resin dispersion is formed by dispersing a polyurethane resin containing a structure derived from acidic group-free polyol (a), a structure derived from polyisocyanate (b), a structure derived from acidic group-containing polyol (c), and a structure derived from a chain extender (d) in an aqueous medium, wherein the acidic group-free polyol (a) contains polyether polyol, the chain extender (d) contains polyether polyamine, the total of a content ratio of an urethane bond and a content ratio of an urea bond in the polyurethane resin is 7.6 to 15.0 mass% based on a solid content, and the total of a content ratio of polyether polyol and a content ratio of polyether polyamine in the polyurethane resin is 75.0 to 85.0 mass% based on the solid content. The aqueous polyurethane resin dispersion can reduce a used amount of an organic solvent used in film formation, and accordingly can contribute to achievement of Goal 7 of SDGs (Sustainable Development Goals).SELECTED DRAWING: None

The embodiment of the invention provides a perovskite cell and a preparation method thereof, a laminated cell and a photovoltaic module. The perovskite cell comprises a substrate, a first hole transport layer, a second hole transport layer, a tunneling layer, a perovskite functional layer, an electron transport layer and an electrode layer which are sequentially arranged in a preset direction, and the first hole transport layer comprises a carbazole derivative with a carboxyl anchoring group. The second hole transport layer comprises a compound of foldable molecules containing phosphonic acid groups, and the tunneling layer is of a network structure. The technical scheme provided by the embodiment of the invention at least has the following advantages: 1, foldable molecules containing phosphonic acid groups cover the gaps of the first hole transport layer after being folded to serve as the second hole transport layer, so that the wettability (contact angle lt: 10 degrees) of the perovskite precursor is improved;

The present invention relates to a highly dispersible organic-inorganic hybrid nanoparticle radical scavenger having excellent low elution characteristics and reversible regenerability and to an electrode composition comprising same, the highly dispersible organic-inorganic hybrid nanoparticle radical scavenger comprising nanoparticles in which an oxide of cerium (Ce) and silicon (Si) and an oxide of at least one metal (M) selected from transition metals and lanthanides are combined, wherein the nanoparticles have at least one functional group selected from an alkylsulfonic acid group and a fluoroalkylsulfonic acid group.

Provided is a water-based inkjet ink that is excellent in continuous ejection stability and straight ejection, and that provides excellent print density and print quality for prints on various printing substrates, particularly paper substrates, and further has good resolubility. [Solution] The aqueous inkjet ink comprises pigment particles including a pigment and a pigment dispersing resin that covers at least a portion of the surface of the pigment, an acetylene diol surfactant (B-1) having a measured HLB value of 6 to 9, a siloxane surfactant (B-2), an alkanediol having 3 to 4 carbon atoms, an alkanediol having 5 to 8 carbon atoms, and a glycol ether having 4 to 10 carbon atoms, wherein the pigment dispersing resin comprises a crosslinked reaction product of a polymer (A-1) that has an aromatic ring and an acid group and an acid value of 50 to 160 mg KOH / g, and a compound (A-2) that has multiple glycidyl ether groups in one molecule, and the compound (A-2) is blended in an amount that results in a glycidyl group content of 50 to 200 mol %.

Provided is a fluoroelastomer composition comprising a fluoroelastomer (a), a cross-linking agent (b), and an organic acid (c), wherein the organic acid (c) is at least one selected from the group consisting of an organic acid having 3 to 10 carbon atoms and having one acid group in a molecule, and an organic acid having 2 to 10 carbon atoms and having two or more acid groups in a molecule.

An organic phosphonate retarder, its preparation method and application relate to the technical field of concrete admixtures. The specific preparation method is as follows: Add a hydroxylamine monomer, water, phosphorous acid, and a catalyst into a reaction vessel, dropwise add formaldehyde for reaction, cool the reaction to room temperature, and add liquid alkali to neutralize to a pH of 5 to obtain the organic phosphonate retarder. The hydroxylamine monomer is an organic compound containing both an amino group and a hydroxyl group in its molecular structure. The molar ratio of the active hydrogen in the amino group of the hydroxylamine monomer to phosphorous acid is 1:0.5 - 1, the molar ratio of phosphorous acid to formaldehyde is 1:1 - 1.2, the catalyst accounts for 3 - 10% of the total mass, and the mass of water accounts for 30 - 50% of the total mass. The organic phosphonate retarder prepared by the present invention has both phosphonic acid groups and hydroxyl groups, can simultaneously complex calcium ions in the cement solution to delay the formation of hydration products, and can form a solvation film on the cement particles to hinder the hydration of cement, with a stronger retardation effect.

The present invention relates to a composition in the form of a water-in-oil emulsion, comprising: a) at least one oily continuous phase comprising at least one volatile oil chosen from volatile hydrocarbon oils, volatile silicone oils and their mixtures, and b) at least one aqueous phase dispersed in said oily phase, the amount of water being greater than or equal to 20% by weight, with respect to the total weight of the composition, and c) at least one hydrophobic film-forming polymer, and d) at least one emulsifying surfactant chosen from polyoxyalkylenated linear polydimethylmethylsiloxanes with an HLB ≤ 8.0, and e) at least 3.0% by weight of a vitamin B3 and / or one of its derivatives, with respect to the total weight of the composition, said composition not containing a water-soluble organic UV screening agent comprising at least one benzylidenecamphorsulfonic acid group nor a water-soluble organic UV screening agent comprising at least one benzoxazolesulfonic acid group.