797 results about "Phosphonate" patented technology

The application provides a process method for preparing (2-(3,6-dimethoxy-9H-carbazol-9-yl)ethyl) phosphonic acid, and particularly relates to the technical field of organic synthesis. The process method is that, under alkaline conditions, a halogenated phosphonate compound is added into a 3,6-dimethoxy-9H-carbazole solution to perform a reaction, hydrochloric acid aqueous solution is added after the reaction to perform acidolysis degreasing, and finally (2-(3,6-dimethoxy-9H-carbazol-9-yl)ethyl) phosphonic acid is obtained through extraction, reflux adsorption and beating purification. The process method uses 3,6-dimethoxy-9H-carbazole as a starting material, realizes the synthesis of the target product through one-pot reaction, has mild reaction conditions, uses non-toxic raw materials which are easy to obtain, has simple synthesis process, is convenient to operate, and has high separation yield.

The invention provides a method for immobilizing phosphonic acid betaine and phosphonic acid on polystyrene, which comprises the following steps: taking quaternary ammonium cation containing glycidyl ether as a spacer arm, carrying out ring-opening reaction on phosphite ester and glycidyl ether connected with the side chain of polystyrene in the presence of an alkali reagent catalyst, grafting phosphonate on polystyrene, and then carrying out acid catalytic hydrolysis on phosphonate to obtain the phosphonic acid betaine and phosphonic acid immobilized on polystyrene. The phosphonic acid and the phosphonic acid group betaine are immobilized on the surface of the polystyrene. The effect of introducing phosphonic acid and phosphonic acid betaine on polystyrene is generated; the adsorbent can be used for adsorption, enrichment and separation of rare earth ions and heavy metal ions, and also has an anion exchange function.

The invention discloses a preparation method of antibacterial fibers and a fabric, and relates to the technical field of textile fabrics. When the antibacterial fiber is prepared, 1, 6-hexanediol, 2-(bromomethyl) diethyl succinate and diethyl 2, 2 ': 6', 2 '-terpyridine-4'-yl phosphonate are polymerized to prepare polyester; the preparation method comprises the following steps: reacting polyester with 7-(dimethylamino) coumarin to prepare modified polyester; the preparation method comprises the following steps: polymerizing maleic anhydride and methyl-vinyl polysiloxane and coating the surface of a phase change microcapsule with the maleic anhydride and the methyl-vinyl polysiloxane to prepare a pre-modified phase change microcapsule; the pre-modified phase change microcapsule and 1-hydroxymethyl-5, 5-dimethyl hydantoin are subjected to a reaction, and a modified phase change microcapsule is prepared; preparing a spinning solution from the modified polyester, the modified phase change microcapsules and copper chloride, performing electrostatic spinning, and performing chlorination finishing to obtain the antibacterial fiber. The antibacterial fiber prepared by the invention has excellent antibacterial, anti-aging, flame-retardant and mechanical properties.

The invention relates to an antistatic functional plastic and a preparation method thereof, and belongs to the technical field of high polymer materials. The plastic with the antistatic function comprises the following components in parts by weight: 80-100 parts of polystyrene resin, 10-20 parts of glass fibers, 1-5 parts of an antioxidant, 2-8 parts of a light stabilizer, 5-10 parts of a modified antistatic agent and 0.3-0.6 part of a modified flame retardant, anhydride groups in the modified antistatic agent are dehydrated at a high temperature to form a conductive layer, static accumulation is effectively reduced, the anhydride groups and quaternary ammonium salt have a synergistic effect on static elimination characteristics and strong adsorption capacity, and meanwhile, the combustion speed is remarkably slowed down through heat absorption and catalysis of maleic anhydride; in the modified flame retardant, an alpha-amino alkyl phosphonate compound is decomposed to generate phosphorus-containing free radicals, a combustion chain is interrupted, nitrogen is released to inhibit combustion, the alpha-amino alkyl phosphonate compound and DOPO cooperate for flame retardance, the flame retardant efficiency is improved, and the prepared antistatic functional plastic has a good antistatic function and also has excellent flame retardant and tensile properties.

The invention belongs to the technical field of polyether polyol, and particularly relates to flame-retardant polyether polyol with a low heat conductivity coefficient as well as a preparation method and application of the flame-retardant polyether polyol. The flame-retardant polyether polyol with the low heat conductivity coefficient is obtained by polymerizing bis (2-hydroxyethyl) aminomethyl diethyl phosphonate, halogen-containing aniline and small molecular alcohol / alcohol amine as a ternary mixed initiator with alkylene oxide under the action of a catalyst, the ternary mixed initiator comprises the following components in percentage by mass: 12.15 to 22.78 percent of bis (2-hydroxyethyl) amino methyl diethyl phosphonate, 43.21 to 63.89 percent of halogen-containing aniline, and 23.96 to 34.01 percent of small molecular alcohol / alcohol amine. The polyether polyol realizes comprehensive properties of lasting flame retardance, high strength and low heat conductivity. The invention also provides a preparation method of the polyether polyol and application of the polyether polyol in rigid polyurethane foam.

The present disclosure refers to a method for building a SERS substrate from metal nanoparticles for determining the content of phosphonate-based scale inhibitors present at low concentrations in water using surface-enhanced Raman spectroscopy (SERS). The substrates also are used in detergent and dispersant products, in corrosion inhibitors and in water treatment systems in general, such as cooling water and boiler water, in addition to being applied in other fields such as the textile, concrete and paper industries.

The disclosed subject matter relates compounds of structure (I), and polymers of structure (II) having a polydispersity ranging from 1 to about 1.1, compositions comprising said polymers and a spin casting solvent, the process of forming a pinning layer selectively on metal with said composition and the process of using said pinning layers to affect chemoepitaxy directed self-assembly of an overlying block copolymer, and the subsequent process of pattern transfer of this self-assembled layer into a substrate by etching.

The invention provides a process method for preparing (2-(3, 6-dimethoxy-9H-carbazole-9-yl) ethyl) phosphonic acid, and particularly relates to the technical field of organic synthesis. The process method comprises the following steps: under an alkaline condition, adding a halogenated phosphonate compound into a 3, 6-dimethoxy-9H-carbazole solution for reaction, after the reaction is finished, adding a hydrochloric acid aqueous solution for acidolysis degreasing, and finally extracting, refluxing, adsorbing, pulping and purifying to obtain the (2-(3, 6-dimethoxy-9H-carbazole-9-yl) ethyl) phosphonic acid. According to the process method, 3, 6-dimethoxy-9H-carbazole is adopted as a starting material, synthesis of a target product is achieved through a one-pot reaction, reaction conditions are mild, used raw materials are non-toxic and easy to obtain, the synthesis process is simple, operation is convenient and fast, and the separation yield is high.

The invention discloses novel environment-friendly flame-retardant corrugated paper and a preparation method thereof, and belongs to the technical field of paperboard products. The corrugated paper is formed by bonding upper surface paper, a V-shaped flame-retardant core base layer and lower surface paper through a flame-retardant adhesive; the flame-retardant adhesive is prepared from the following components in parts by weight: 50 to 65 parts of oxidized cassava starch, 12 to 23 parts of phosphate esterified urea-formaldehyde resin, 5 to 15 parts of nitrogen-phosphorus modified isocyanate-based polyurethane and 2 to 8 parts of nano aluminum hydroxide; wherein the nitrogen and phosphorus modified isocyanate-based polyurethane is prepared by carrying out a reaction on isophorone isocyanate, bisphenol A type monophenyl phosphonate and modified montmorillonite, and the modified montmorillonite is prepared by carrying out a reaction on montmorillonite and polysiloxane. The corrugated paper provided by the invention has excellent flame retardant property, and also has good chemical stability and mechanical properties.

The invention relates to a synchronous grouting material based on muddy silt shield muck and a preparation method thereof, and the synchronous grouting material comprises the following raw materials in parts by weight: 13 to 16 parts of cement, 16 to 20 parts of slag, 142 to 147 parts of fine sand containing silt powder, 0.03 to 0.1 part of trimethylsilyl ethyl acetate, 0.07 to 0.17 part of disodium hydroxyethylphosphonate, 0.03 to 0.1 part of pentasodium amino trimethylene phosphonate and 63 to 67 parts of water. According to the invention, the fine sand containing mud powder is used as a main raw material to replace bentonite and fine sand in synchronous grouting in the prior art, and is combined with a specific cement additive, so that the compressive strength and the impermeability of the synchronous grouting material are effectively improved through the synergistic effect of the components, local materials can be used, and the outward transportation and disposal cost of a large amount of muck can be greatly reduced.

The invention relates to the field of fire-resistant oil, in particular to phosphate-based fire-resistant oil with synergistically optimized flame resistance and stability and a preparation method of the phosphate-based fire-resistant oil. The fire-resistant oil comprises base oil and an additive, the base oil is a mixture obtained by esterification of mixed alkylphenol and phosphorus oxychloride; the molar percentage of the mixed alkylphenol is as follows: 4-6% of phenol; 11 to 14 percent of p-methylphenol; 22 to 26 percent of 2, 5-position dimethyl phenol; 0.8 to 1.5 percent of 2, 4-position dimethyl phenol; 2.5 to 4 percent of 2, 3-position dimethyl phenol; 0.4 to 0.6 percent of 4-ethyl phenol; 40 to 48 percent of 3, 5-position dimethyl phenol; 8 to 11% of 3-ethyl phenol; 3 to 5 percent of 3, 4-position dimethyl phenol; the additives comprise an antioxidant, a corrosion inhibitor, an anti-foaming agent and an anti-hydrolysis agent; the addition amount of the antioxidant is 0.05-5% of the total mass of the base oil; the addition amount of the corrosion inhibitor is 0.001%-0.08% of the total mass of the base oil; the addition amount of the anti-foaming agent is 0.001%-0.009% of the total mass of the base oil; the addition amount of the anti-hydrolysis agent is 0.001%-0.005% of the total mass of the base oil. The fire-resistant oil provided by the invention can be safely used under the working conditions of high temperature and extreme pressure.

The invention relates to the technical field of coatings, in particular to a high-performance corrosion-resistant environment-friendly coating and a preparation process thereof. The preparation method comprises the following steps: firstly, preparing flame-retardant polysiloxane and formylated phosphonate, and then reacting the formylated phosphonate with the flame-retardant polysiloxane in an alkaline environment to obtain the composite organic silicon. And finally mixing the epoxy resin, the composite organic silicon, the aluminum hydroxide filler and the like to obtain the finished coating. The finished coating prepared by the invention has good flame retardance, weather resistance and corrosion resistance, so that the coating has a wide application prospect in the technical field of coatings.

The invention discloses a chiral alpha alkyl beta hydroxyl phosphate compound as well as a preparation method and application thereof, and belongs to the technical field of chemical synthesis. In the presence of a catalyst, carbonyl of a substrate is reduced into hydroxyl to obtain a chiral alcohol compound, alpha-alkyl beta-ketophosphonate is reduced by an asymmetric catalytic hydrogen transfer method, and a reduced product can be used as a core skeleton of various drug molecules, so that the chiral alcohol compound is prepared. The compound has an obvious promotion effect on migration and repair of keratinocytes, and has great application potential in the aspects of wound healing, skin tissue soothing, repair, aging resistance and the like.

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 discloses a corrosion and scale inhibitor suitable for high-salinity water quality and a preparation method and application thereof.The corrosion and scale inhibitor comprises nano SiO2 at NH2, organic phosphonate, zinc salt, polycarboxylic acid and nano SiO2, a corrosion inhibition component is composed of the nano SiO2 at NH2, the organic phosphonate and the zinc salt according to the mass ratio of (0.8-1.2): 0.5: (0.3-0.4), a scale inhibition component is composed of the polycarboxylic acid and the nano SiO2 according to the total solid content mass ratio of 3: 1, and the scale inhibition component is composed of the nano SiO2 at NH2, the organic phosphonate and the zinc salt. The polycarboxylic acid grafting rate in the scale inhibition component is greater than or equal to 80%, and the corrosion inhibition component and the scale inhibition component are compounded according to the ratio of 1: 1 to prepare a finished product agent; the preparation method comprises the following steps: preparing the corrosion inhibition component, adjusting the pH value to 3-4, preparing the scale inhibition component, and compounding the corrosion inhibition component and the scale inhibition component to prepare the finished product agent. According to the invention, nano SiO2 and NH2 are added to prepare a corrosion inhibition component, nano SiO2 is added to prepare a scale inhibition component, and the components are strictly mixed step by step, so that the components form a chemical and physical multi-synergistic corrosion and scale inhibition effect, and the finished agent has the characteristics of corrosion inhibition rate, CaCO3 resistance rate higher than 95%, MgSiO3 resistance rate higher than 80%, high-salt environment tolerance, high high-temperature stability, low biotoxicity and the like.

The invention discloses a heterogeneous photo-Fenton method for high-selectivity oxidation treatment of organic phosphonate in a water body, and belongs to the technical field of water treatment. According to the invention, in a heterogeneous photo-Fenton reaction system composed of a photocatalyst, copper and H2O2, high-efficiency and high-selectivity oxidation of p-hydroxyethylidene-1, 1-diphosphonic acid (HEDP) into orthophosphate is realized. According to the heterogeneous photo-Fenton reaction system disclosed by the invention, the degradation rate of HEDP can reach 97% within 6 minutes, and excellent reaction activity is shown. According to the method disclosed by the invention, the selective oxidation capacity on HEDP can still be kept in the presence of a coexisting competitive substrate. The catalyst provided by the invention has excellent recoverability and stability, and still keeps good activity after being recycled for multiple times, so that the environmental influence and the treatment cost are remarkably reduced, and the economic feasibility is enhanced. The method disclosed by the invention also shows certain universality, is suitable for various types of photocatalysts and different forms of copper, and shows higher orthophosphate yield.

The invention discloses a modified phenolic resin and a preparation method thereof, and belongs to the technical field of phenolic resins, the modified phenolic resin comprises the following raw materials by mass: 100 parts of phenol, 140-145 parts of a formaldehyde aqueous solution, 25-30 parts of gradient topology phosphonate, 15-17 parts of hyperbranched siloxane, 12-14 parts of a dynamic borate cross-linking agent, and 3-4 parts of hexamethylenetetramine. Through the synergistic effect of the gradient topology phosphonate, the hyperbranched siloxane and the dynamic boric acid ester cross-linking agent, the flame retardance, the thermal stability, the mechanical property and the dynamic function of the phenolic resin are comprehensively improved, and the environmental protection property of the phenolic resin is remarkably superior to that of a traditional technology. The experimental data fully verifies the inseparability and synergistic interaction among innovation points, and the technical combination and effect are non-obvious and accord with the creativity requirement of the patent. In addition, the application potential of the resin in the fields of aerospace, electronic packaging and the like further highlights the industrial value of the resin.

The invention discloses a carbazole phosphonate-thiophene copolymer as well as a preparation method and application thereof. The structural formula of the carbazole phosphonate-thiophene copolymer is shown as a formula (I), according to the invention, the carbazole phosphonate compound and the thiophene compound are copolymerized, and the obtained copolymer is used for preparing the hole transport layer of the perovskite solar cell, so that the perovskite solar cell has relatively high photoelectric conversion efficiency, and the relatively high photoelectric conversion efficiency can be kept in a humid and hot environment.

The invention discloses a rare earth doped humic acid-based retarder, a preparation method and application thereof in grouting materials, and belongs to the technical field of inorganic non-metal building materials. The invention discloses a rare earth doped humic acid-based retarder, which is prepared from the following raw materials in parts by weight: 35 to 50 parts of rare earth modified humic acid, 10 to 15 parts of amphiphilic phosphonate dispersing agent, 5 to 8 parts of magnesium phosphate corrosion inhibition reinforcing agent, 8 to 12 parts of nano silicon dioxide and 3 to 5 parts of function regulator. The loading capacity of rare earth oxide in the rare earth modified humic acid is 8-12wt%. The retarder provided by the invention realizes effective retarding through an innovative hydration inhibition mechanism, and has significant advantages in temperature response characteristics, hydrolysis resistance and diversified regulation performance. The effects are synergistic, so that the grouting agent is particularly suitable for grouting construction under severe conditions such as high temperature and the like, and a more stable, reliable and flexible solution is provided for engineering.

The invention comprises a process for the production of a linear P-linked oligonucleotide bearing an alkyl phosphonate group at 5′-terminus of the formula Iwherein R1 is a C1-4-alkyl group, R2 is fluoro, hydroxyl or C1-4-alkoxy, X is sulfur or oxygen, the term Nucleobase stands for an optionally modified adenine, cytosine, guanine or uracil and the term oligo strand stands for the remaining P-linked oligo nucleotide strand, and wherein the oligo strand comprises at least one uracil nucleobase.The process is performed under conditions that the level of alkyl transfer impurities and the level of cyanoethyl (CNET) impurities in the linear P-linked oligonucleotide of formula I, is substantially reduced.

The invention relates to the field of polyurethane, and discloses a preparation method of a linear reaction type phosphorus-nitrogen-silicon synergistic flame-retardant solvent-free polyurethane coating, which comprises the following steps: S1, carrying out exchange reaction on phosphonate and alcohol amine ester to obtain a phosphorus-nitrogen polyol intermediate; s2, carrying out condensation polymerization on the phosphorus-nitrogen polyol intermediate and chlorosilane to obtain phosphorus-nitrogen-silicon polyol; s3, mixing polyester / polyether polyol, a chain extender and an amine / metal catalyst to obtain a component A; mixing and reacting isocyanate, part of polyester / polyether polyol and phosphorus-nitrogen-silicon polyol to obtain a component B; mixing the component A and the component B, spraying the mixture on release paper, and curing. Through a synergistic flame-retardant mechanism of phosphorus, nitrogen and silicon, the balance of efficient flame retardance, mechanical properties and excellent coating properties is realized. The solvent-free system realizes zero emission of volatile organic compounds, and the linear reaction type design ensures that the mechanical properties and durability of the coating are not influenced.

The invention discloses a synthesis method of allyl phosphonic acid diester. According to the method, phosphorous acid diester and an allyl chloride compound are used as raw materials and react in the presence of a specific transition metal catalyst and alkali under the conditions of normal pressure and 45-60 DEG C to obtain the allyl phosphonic acid diester. The method has the advantages of mild reaction conditions, simple operation, high product yield (90-99%), no by-product, no generation of halogenated alkane gas and easy industrial production, and is suitable for the fields of polymer flame retardants, electronic materials, pesticide and medicine intermediates and the like.

The present disclosure relates to a deblocking agent and compositions thereof for cleaving an NO bond in an amineoxy group at the 3' position of a non-extendable polynucleotide, the deblocking agent being a carbonyl phosphonate and / or sulfonate, or salt thereof. The present disclosure further relates to methods of activating and / or extending a non-extendable polynucleotide using the deblocking agent of the present disclosure. The present disclosure also relates to methods of sequencing a target nucleic acid comprising the methods of activating a non-extendable polynucleotide of the present disclosure.

The invention relates to a process for preparing a phosphor copper rod by using a phosphonate-amide composite purifying agent as a quenching aid, and belongs to the technical field of non-ferrous metallurgy. Phosphorus pentoxide and sodium carbonate are mixed and decocted into fused salt, the fused salt is cooled and ground and then added into a corundum crucible together with scrap copper to be rapidly heated, compressed air is blown in, and slagging-off is conducted after heat preservation and standing; blowing mixed gas into the melt for reduction refining; adding calcium boride into the melt for refining; the refined copper liquid is subjected to continuous casting and continuous rolling; rapidly immersing the phosphorus copper rod subjected to continuous casting and rolling into a quenching aid solution, and carrying out quenching treatment; and the quenched phosphor copper rod is blow-dried and dried, and the high-conductivity phosphor copper rod is obtained. The high-purity phosphorus copper rod prepared by the method is excellent in key indexes of copper content, phosphorus content and conductivity, and meets the expected requirements of high purity and high conductivity.

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 invention discloses a graphene-based high-strength heat-conducting film and a preparation method thereof, belongs to the technical field of heat-conducting film preparation, and aims to solve the technical problem that the strength and corrosion resistance of a heat-conducting film in the prior art need to be further improved. Graphene-aromatic phosphonate heat-conducting resin, maleic anhydride grafted fluorinated polyether-ether-ketone and fluorinated siloxane elastomer are jointly applied to membrane material preparation, so that the material forms a system with a continuous structure in the aspects of heat-conducting framework construction, interface connection and deformation slow release, the graphene-aromatic phosphonate heat-conducting resin provides a high-efficiency heat-conducting path, the maleic anhydride grafted fluorinated polyether-ether-ketone realizes stable interface bonding, and the fluorinated siloxane elastomer endows the membrane material with a structure retention capability under an external force and a medium environment. The obtained high-strength heat-conducting film has relatively high heat conductivity coefficient, strength and quality stability in an acid-base environment, and shows excellent comprehensive performance.

Fluorine and siloxane-free compositions for manufacturing molded pipette tips that exhibit improved expulsion of liquid samples from the tips. A non-fluorinated composition may include an organo-modified siloxane, a triglyceride ester, an organo phosphinite, and a carrier resin. A non-fluorinated, siloxane-free composition may include a triglyceride, an organo phosphinite, an aluminum oxide, and a carrier resin. The disclosed compositions may increase the hydrophobicity of a resulting product including but not limited to fiber, nonwoven fabric, and / or products produced by injection molding.

The invention discloses a modified polyester fiber as well as a preparation method and application thereof, and relates to the field of fibers. When the modified polyester fiber is prepared, nano shell powder sequentially reacts with 3-aminopropyltrimethoxysilane, 4-fluoro-2-hydroxybenzaldehyde and 1-(4-hydroxyphenyl) biguanide hydrochloride, and functionalized shell powder is prepared; the preparation method comprises the following steps: reacting diethyl (aminomethyl) phosphonate, formaldehyde and glyoxal to prepare imidazolium salt phosphoric acid; and mixing the functionalized shell powder and polyester, spinning, carrying out surface alkali treatment, and finally carrying out surface finishing by using imidazolium salt phosphoric acid to obtain the modified polyester fiber. The modified polyester fiber prepared by the invention has excellent flame retardance, antibacterial property and light aging resistance.

The invention relates to the technical field of drag reducer preparation, and in particular to a method for producing a salt-resistant drag reducer for oil well fracturing. S1.1, weighing the following raw materials in parts by weight: 27-32 parts by weight of a modified polymer, 0.6-1.1 parts by weight of a cross-linking agent, 0.1-0.3 parts by weight of an antioxidant, 2-6 parts by weight of an acetate buffer, 0.6-0.8 parts by weight of a surfactant, 0.02-0.04 parts by weight of a benzalkonium chloride biocide, and 0.2-0.4 parts by weight of a bentonite suspending agent; wherein, the modified The polymer is prepared by copolymerization of acrylamide, crotonic acid and acrylic acid phosphonate in a mass ratio of 7:2 to 4:10 to 13; S1.2, adding the above raw materials and continuously stirring to obtain a salt-resistant drag reducer; crotonic acid, acrylic acid phosphonate and acrylamide are used to prepare a modified polymer, and carboxyl and phosphonic acid groups are introduced into the polyacrylamide, thereby enhancing the water solubility of the polymer and, at the same time, improving the coordination ability of the modified polymer with the zirconium ions in the cross-linking agent, thereby improving the salt resistance and drag reduction effect of the modified polymer.

The present invention relates to a composition comprising components (A) and (B) as active ingredients, wherein component (A) comprises a Streptomyces and component (B) is a compound selected from the group consisting of sulphur, phosphonate, copper hydroxide, copper oxychloride, bicarbonate, Bacillus sp, Trichoderma sp, aureobasidin A, jawsamycin, kasugamycin, natamycin, a polysaccharide elicitor, a plant biostimulant (PBS) comprising an algal extract, a plant extract and / or vinasse, orange oil, and / or tea tree oil. The invention further relates to a method of controlling or preventing phytopathogenic diseases, preferably phytopathogenic fungi, on a plant or on plant propagation material and / or on harvested food crops, which comprises applying to the plant, on plant propagation material, the locus thereof, and / or on harvested food crops the composition according to the present invention.