340 results about "Propionate" patented technology

The invention discloses piggy creep feed containing composite flavone. The piggy creep feed is prepared from the following raw materials in parts by weight: 13 to 20 parts of expanded corn, 10 to 25 parts of corn, 6 to 13 parts of broken rice, 8 to 12 parts of flour, 8 to 15 parts of whey mist, 3 to 8 parts of soy protein concentrate, 5 to 10 parts of extruded soybean, 0.7 to 3 parts of soya-bean oil, 7 to 12 parts of 46.5-percent bean pulp, 2 to 5 parts of fish meal, 2 to 5 parts of plasma protein powder, 0.3 to 0.7 part of mountain flour, 0.5 to 1.0 part of calcium hydrophosphate, 0.05 to 0.5 part of lysine, 0.05 to 0.3 part of threonine, 0.1 to 0.3 part of sodium chloride, 0.1 to 0.8 part of compound flavone premix compounds, 0.15 to 0.3 part of zinc oxide, 0.03 to 0.06 part of calcium propionate, 0.02 to 0.04 part of ethoxyquin and 1.0 part of suckling pig premix compounds. The invention also discloses a preparation method. The intestinal tract health and the production performance of weaned pigs can be improved.

The invention provides a secondary battery and an electronic device. The secondary battery comprises a positive pole piece, a negative pole piece, electrolyte and an isolating membrane arranged between the positive pole piece and the negative pole piece. The separator film includes a base film and an inorganic coating layer on opposite surfaces of the base film. The inorganic coating includes a plurality of inorganic particles. Dv99 of the inorganic particles is A, and the unit is [mu] m. And the porosity of the base membrane is B%. Wherein the ratio B / A of B to A is greater than or equal to 1.25 and less than or equal to 40. And the electrolyte comprises propyl propionate. Based on the total mass of the electrolyte, the mass percentage content of propyl propionate is C%, and C is more than or equal to 20 and less than or equal to 45. Through the special design of the isolating membrane and the matching of the content control of the propyl propionate in the electrolyte, the secondary battery has low impedance and high safety performance under high-temperature and high-rate charge and discharge, and can effectively prevent overcharge and improve the cycle performance of the secondary battery.

The present invention relates to the technical field of pharmaceutical preparations, and specifically discloses a beclomethasone dipropionate suspension for inhalation and a preparation method thereof. The present invention uses polyethylene glycol hyaluronic acid as a surfactant, polysorbate 80 (II) as a wetting agent, and colloidal microcrystalline cellulose as a suspending agent, first prepares an auxiliary material solution containing part of the surfactant, the wetting agent and the suspending agent, and a drug solution of beclomethasone dipropionate and the surfactant, and then mixes the drug solution with the auxiliary material solution and homogenizes under high pressure to prepare the beclomethasone dipropionate suspension for inhalation. The prepared beclomethasone dipropionate suspension has excellent storage stability and effective lung deposition rate, effectively solves the potential harm to respiratory tissue caused by the use of a large amount of Tween 20 and Span-type surfactants in the original research, can achieve a good replacement for the original research product, and has a simple preparation process, good repeatability, and is easy to achieve industrialized large-scale production, and has a high value of promotion and application.

The invention belongs to the field of detection and analysis, and relates to a method for separating and detecting enantiomers in (S)-2-amino-3-[2-(tert-butoxy)-2-oxoacetamido] tert-butyl propionate hydrochloride. According to the method, HPLC is adopted for separation and detection, a polysaccharide derivative chiral chromatographic column is selected as a chromatographic column, a mobile phase A is a weak base aqueous solution, and a mobile phase B is acetonitrile and / or methanol. The method is strong in specificity, high in separation degree, high in accuracy, stable, reliable and high in sensitivity, and a simple, accurate, rapid and reliable detection method is provided for control of impurities in a starting material of (S)-2-amino-3-[2-(tert-butoxy)-2-oxoacetamido] tert-butyl propionate hydrochloride.

The invention relates to an electrode adhesive as well as a preparation method and application thereof. The electrode adhesive comprises a water-soluble high-molecular polymer and an amino-containing polymer, the water-soluble high-molecular polymer is obtained by sequentially carrying out polymerization reaction and alcoholysis reaction on monomers; the monomers comprise a type I monomer, a type II monomer and a type III monomer; the monomer I comprises vinyl acetate and / or vinyl propionate; the monomer II comprises methacrylate containing short-chain alkane and / or acrylate containing short-chain alkane; and the III type monomer contains cyano groups. The electrode adhesive provided by the invention has good adhesive property, flexibility and temperature stability, is resistant to electrolyte swelling, and is suitable for an electrode material of a lithium ion battery.

The invention belongs to the technical field of crosslinked polyethylene, and particularly relates to crosslinked polyethylene for a high-voltage cable and a preparation method of the crosslinked polyethylene. The cross-linked polyethylene for the high-voltage cable is prepared from the following raw materials in parts by weight: 100 parts of low-density polyethylene, 3.5 to 4.5 parts of nano filler master batch, 0.30 to 0.35 part of tetra [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester, 0.7 to 0.8 part of 2, 2, 6, 6-tetramethylpiperidine oxide, 0.7 to 0.8 part of 4-allyloxy-2-hydroxybenzophenone, 0.7 to 0.8 part of 2, 5-dimethyl-2, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 5-trimethyl-1, 3, 1.0 to 1.2 parts of 2, 5-di-tert-butylperoxy-3-hexyne; and 0.8 to 1.0 part of tert-butyl peroxyisononanoate. The crosslinked polyethylene for the high-voltage cable has excellent tensile strength and breakdown strength.

The present invention relates to the topical pharmaceutical composition comprising about 0.001% w / w to about 1% w / w latanoprost and about 1% w / w to about 15% w / w cortexolone-17α-propionate and a pharmaceutically acceptable vehicle comprising one or more solvent and process of its preparation. The invention further relates to the method wherein the composition is suitable for preventing and / or treating hair loss and / or stimulating hair growth. in patients suffering from alopecia, in particular androgenic alopecia (AGA).

The invention relates to an electrolyte, a secondary battery and an electronic device. Specifically, the invention provides the electrolyte, the electrolyte comprises propylene carbonate, propyl propionate, butanedinitrile and 1, 3, 6-hexane trinitrile, relative to 100 parts by mass of the electrolyte, the propylene carbonate accounts for 14 to 20 parts by mass, the propyl propionate accounts for 10 to 55 parts by mass, the butanedinitrile accounts for 0.3 to 4 parts by mass, and the 1, 3, 6-hexane trinitrile accounts for 1 to 6 parts by mass; the electrolyte further comprises adiponitrile, and the adiponitrile is 0.05-0.5 part by mass relative to 100 parts by mass of the electrolyte. According to the invention, the low-temperature discharge performance and the over-temperature safety performance of the secondary battery can be improved.

The invention belongs to the technical field of rubber sealing rings, and particularly discloses a wading rubber sealing ring and a preparation method thereof, the wading rubber sealing ring comprises the following components by weight: 60-70 parts of modified ethylene propylene diene monomer, 35-50 parts of modified white carbon black, 20-30 parts of hydrogenated nitrile rubber, 0-10 parts of fluororubber, 2-5 parts of polyester fiber, 0.5-3 parts of an anti-hydrolysis agent, and 1-3 parts of a hydrophobic agent. 2-4 parts of an antimicrobial agent, 3-5 parts of an anti-aging agent and 1-7 parts of sulfur; the anti-hydrolysis agent is a mixture of tetrakis [beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester and a carbodiimide anti-hydrolysis agent; the hydrophobic agent is a mixture of polydimethylsiloxane and perfluorooctyltriethoxysilane, and the hydrophobic agent is a mixture of polydimethylsiloxane and perfluorooctyltriethoxysilane. The wading rubber sealing rubber ring and the preparation method thereof are suitable for fresh water and warm water scenes, and have wide application prospects in ship sealing and sewage treatment equipment in seawater and industrial wastewater scenes.

The present invention relates to a crosslinkable polyethylene composition comprising an additive composition consisting of a mixture of polyethylene glycol and a mixture of 4, 4 '-thiobis (2-tert-butyl-5-methylphenol) plus thio-diethylene bis [3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionate], and a method for producing the crosslinkable polyethylene composition.

The invention discloses a method for preparing 2-(R)-fluoromethyl propionate with optical activity, and relates to the technical field of organic synthesis.The method comprises the steps that 1, an organic solvent and amines are added into a sealing system under nitrogen protection, hexafluoropropylene is added, a heat preservation reaction is conducted, then aftertreatment is conducted, and a fluorinating agent is obtained; and step 2, adding the fluorinating agent obtained in the step 1 and L-methyl lactate into a closed system under the protection of nitrogen, and carrying out heat preservation reaction to obtain the 2-(R)-fluoromethyl propionate. The method disclosed by the invention has the advantages of simple preparation process, low raw material cost, high yield, low safety risk, less generated three wastes and low treatment cost of the three wastes.

The invention relates to a high-toughness polycarbonate composite material and a preparation method thereof, and belongs to the technical field of polymer materials. The composite material comprises, by weight, 100 parts of modified PC resin, 10-15 parts of ABS resin, 4.5-6.5 parts of oleophilic silica and 0.8-1.1 parts of a processing aid. The modified PC resin is prepared by amine ester exchange of 3-(3,5-di-tert-butyl-4-hydroxyphenyl) methyl propionate and diethanolamine to prepare an intermediate, and then the tertiary amine structure in the intermediate molecule is used to in-situ promote the ring opening of the grafted hydroxyl group and the terminal epoxy silicone oil, and introduce an organic silicon chain, and then the active amino group of p-aminophenol and the residual epoxy are opened, and the phenol structure is introduced for end-capping to prepare a modifier, and finally, the modifier is ester exchanged with bisphenol A and diphenyl carbonate to prepare the modified PC resin, and the composite material with the modified PC resin as a matrix has higher comprehensive strength and toughness performance than the existing PC / ABS material.

The invention relates to the field of polyester resin materials, in particular to low-temperature curing polyester resin and powder paint.The low-temperature curing polyester resin is prepared from, by weight, 30-40 parts of neopentyl glycol, 50-60 parts of terephthalic acid, 5-10 parts of adipic acid, 0-0.1 part of organic tin catalyst, 5-10 parts of hyperbranched polyisocyanate, 5-10 parts of end-capping reagent and 0.1-1 part of auxiliaries; the hyperbranched polyisocyanate is prepared from trimethylolpropane, N, N-dihydroxyethyl-3-amino methyl propionate and alicyclic diisocyanate, the prepared powder coating can be cured at a low temperature, the coating has excellent performance, and the powder coating has wide application prospects in the fields of building material aluminum materials and engineering machinery.

The invention belongs to the field of gene engineering, and particularly relates to an N-acetylneuraminic acid aldolase mutant and application of the N-acetylneuraminic acid aldolase mutant in catalytic preparation of N-acetylneuraminic acid. According to the invention, the amino acid of wild type N-acetylneuraminic acid aldolase sourced from Corynebacterium propionate is modified, the 149th valine of the wild type N-acetylneuraminic acid aldolase is mutated into lysine, the 233rd arginine of the wild type N-acetylneuraminic acid aldolase is mutated into glutamine, the 235th lysine of the wild type N-acetylneuraminic acid aldolase is mutated into aspartic acid, and the 241st valine of the wild type N-acetylneuraminic acid aldolase is mutated into arginine; and the N-acetylneuraminic acid aldolase mutant with higher activity is obtained. When the high-activity N-acetylneuraminic acid aldolase mutant is used for catalyzing and producing N-acetylneuraminic acid, the conversion efficiency is effectively improved, and the mutant has important industrial application prospects.

The invention relates to the technical field of tackifiers, and discloses a preparation method and application of an organic silicon tackifier. Vinyl isophthalic acid and epoxy chloropropane are subjected to an esterification reaction under catalysis of tetraethylammonium bromide to obtain vinyl epoxypropyl isophthalate; and carrying out polymerization reaction on the modified rosin, allyl propionate modified rosin and alkenyl silicone oil under the initiation of azodiisobutyronitrile to obtain the organic silicon tackifier. And adding the organic silicon tackifier into the base material, and uniformly mixing to obtain the silicone rubber adhesive. The organic silicon tackifier prepared by the invention contains ester groups, carboxyl groups and epoxy groups with relatively strong polarity, and is easy to chemically react with a base material or form secondary valence bonds, so that the adhesion of a silicon rubber adhesive is enhanced, and the organic silicon tackifier is easy to tangle with each other after being added into silicon rubber to form a network structure, so that the mechanical property of the silicon rubber is enhanced. The tackifier prepared by the invention has excellent mechanical property and adhesive property when being applied to silicone rubber.

The invention discloses a method for synthesizing loxoprofen sodium by using a resin catalyst, and belongs to the field of medical chemical synthesis. The preparation method comprises the following steps: synthesizing 2-methylene cyclopentanone through methylenation reaction of cyclopentanone, paraformaldehyde and amine; the preparation method comprises the following steps: reacting 4-halogenated phenylacetate with methyl iodide to synthesize 2-(4-halogenated phenyl) propionate; a target intermediate 2-(4-((5-oxocyclopentyl-1-alkenyl) methyl) phenyl) propionate is generated through a Heck coupling reaction; further reducing to 2-(4-((2-oxygen cyclopentyl) methyl) phenyl) propionate through a catalytic hydrogenation reaction; and finally, carrying out a salt forming reaction to obtain loxoprofen sodium. The method adopts the self-made resin catalyst, is efficient and environment-friendly, has good yield and purity, and is suitable for industrial production.

The invention discloses microencapsulated perfluorohexanone as well as a preparation method and application thereof. Perfluorohexanone serving as a core material is embedded in a core part of a microcapsule; the shell layer I is formed by carrying out polymerization reaction on isophorone diisocyanate, trimethylolpropane and 1, 4-butanediol; the shell layer II is formed by interface bonding of the shell layer I subjected to surface modification through a silane coupling agent and polyurethane propionate, chemical bonding of the microcapsule and a secondary embedding layer is enhanced through modification of the silane coupling agent, PUA and nano-silica form double barriers, leakage is reduced, thermal degradation is delayed, and the microcapsule has the advantages of being good in stability, good in stability, good in stability and the like. The heat stability of the nano silicon dioxide and the mechanical strength of the PUA jointly improve the control capacity of release of the fire extinguishing agent, the steps or components are omitted, and the core functions (embedding, heat stability and fire extinguishing) of the microcapsule are remarkably reduced due to structural defects and insufficient interface bonding.

The invention provides a high-foaming self-thickening amino acid cleaning composition and a preparation method thereof, and relates to the technical field of cosmetics. The high-foaming self-thickening type amino acid cleaning composition is prepared from the following raw materials in percentage by mass: main surfactants: 15%-20% of potassium cocoyl glycinate, 0.5%-2.0% of sodium cocoyl amino propionate and 0.05%-2% of sodium lauroyl glutamate; the auxiliary surfactant comprises the following components in percentage by weight: 1.2%-1.8% of sodium lauroamphoacetate, 1.8%-3.6% of lauryl hydroxyl sulfobetaine, 0.5%-1.5% of sodium methyl cocoyl taurate and 0.5%-1.5% of lauryl glucoside; and 0.5%-1.8% of an acrylic ester copolymer. The cleaning composition is free of fatty acid components, small in irritation, rich and dense in foam, good in foam performance, high in cleaning power, good in flushing performance, free of false slip after flushing and good in stability.

The invention discloses a preparation method of (R)-2-(4-chloro-2-methylphenoxy) propionate compounds, which comprises the following steps: providing compounds with structures shown in formulas I and II: R-OH formula I, in the formula I, R is selected from C1-C18 alkyl substituted or unsubstituted by hydroxyl,-(R1-O) m-R1-OH,-(R4-O-CO-O) n-R4-OH,-(R4-O-CO-R10) w-OH,-R7-O (-CO-O-(R6-O-) p) q-R7-OH, R1 is alkylene of C2-C4, m is an integer of 4-28, and R2 is an integer of 4-28; r4 is a C3-C15 alkylene group or # imgabs0 # n is an integer from 1 to 20; r10 is # imgabs1 # w which is an integer from 1 to 15; r < 6 > is isopropylidene, R < 7 > is C2-C5 alkylene, p is an integer of 1-5, and q is an integer of 5-30; in the formula II, R2 and R3 are independently selected from H, C1, Br and I, and at least one of R2 and R3 is C1 or Br or I; compounds shown in the formula I and the formula II react under the catalytic condition to generate a compound shown in the formula III, wherein R, R2 and R3 are defined as above; the compound shown in the formula III and 4-chloro-o-cresol are catalyzed by an etherification catalyst to generate a compound shown in a formula IV, and in the formula IV, R is defined as above; # imgabs2 #

The invention discloses an ethylene-vinyl acetate copolymer, an ethylene-vinyl alcohol copolymer and a preparation method thereof, and belongs to the field of polymers. Comprising the following steps: putting a mixture containing an initiator, a chain transfer agent, a solvent and vinyl acetate into a closed container, introducing ethylene gas, and carrying out pressurized polymerization to obtain the ethylene-vinyl acetate copolymer, the initiator is selected from at least one of lauroyl peroxide, benzoyl peroxide, azodiisobutyronitrile and azobisisoheptonitrile; the chain transfer agent is selected from the group consisting of 2-dimethylaminoethyl acetate and / or 2-dimethylaminoethyl propionate. The preparation method of the low-branching-degree EVA has the characteristics of mild conditions, strong controllability, simplicity in operation and large-scale application prospect. The invention also provides an ethylene-vinyl alcohol copolymer prepared from the prepared EVA through alcoholysis reaction, and the ethylene-vinyl alcohol copolymer has the characteristics of high molecular weight, narrow distribution, good appearance and the like, and meets the application requirements of commercial EVOH.

The invention relates to a synthesis method of 3-methoxy-N, N-dimethyl propionamide, and belongs to the technical field of organic synthesis. Methyl 3-methoxy propionate, N, N-dimethyl formamide and water are used as raw materials, Lewis acid is used as a catalyst, mixing heating, heat preservation stirring reaction and rectification are performed, and the 3-methoxy-N, N-dimethyl propionamide is obtained. According to the method, the methyl 3-methoxypropionate is used as a raw material, the N, N-dimethylformamide is used as a function substitute reagent of dimethylamine gas, the lewis acid is used as a catalyst, the raw material is wide in source and easy to transport and store, and high yield can be obtained through simple combination of several types of lewis acid catalysts. The method is simple and efficient in technological process, low in cost, high in reaction yield and few in by-product, and has a high industrial application prospect.

The present invention relates to a precise lactation feed for lactating sows, and 100 kg of the feed product comprises the following raw materials by weight: 20 to 28 kg of soybean meal, 2 to 5 kg of fish meal, 2 to 5 kg of MCT microcapsules, 0.2 to 0.4 kg of rumen protected methionine, 0.1 to 0.2 kg of rumen protected tryptophan, 1.5 to 2.5 kg of inulin, 1 to 2 kg of sodium lignin sulfonate, 0.01 to 0.03 kg of a fenugreek seed extract, 1.2 to 1.8 kg of sn-2 palmitate, 0.4 to 0.6 kg of alpha-ketoglutaric acid, 0.08 to 0.12 kg of glycine iron, and the balance of water. The feed is prepared from the following raw materials by weight: 0.15-0.25 kg of zinc methionine, 4-8 kg of wheat bran, 1.2-1.8 kg of a calcium propionate solution, 2-3 kg of lactic acid bacteria fermentation liquor, 0.2-0.4 kg of a rosemary extract and the balance of corn, wherein the total weight of the raw materials is 100 kg. The feed is a precise nutrition regulation feed formula for the sows in the lactation period, and milk yield increase, piglet weaning performance optimization and sow body condition protection are achieved through multi-dimensional nutrition intervention.

The invention relates to the technical field of medical biology, and discloses a composition for promoting interaction of collagen and hyaluronic acid, which comprises collagen, hyaluronic acid and a chemical cross-linking agent. According to the preparation method of the composition for promoting interaction of the collagen and the hyaluronic acid and the application of the chemical cross-linking agent N (beta maleimido) propionate, a stable chemical bond is formed between the collagen and the hyaluronic acid, and the molecular structure is optimized, so that the composition is easier to penetrate through the cuticle of the skin, and the interaction of the collagen and the hyaluronic acid is promoted. Physical treatment of ultrasonic waves and a high-voltage pulse electric field accelerates formation of a compound, the skin barrier is reduced through mechanical and electroporation effects, conditions are provided for deep penetration of the compound, particles are refined through the cavitation effect of the ultrasonic waves, and uniformity and fluidity are improved; the electroporation effect of the high-voltage pulsed electric field increases the permeability of cell membranes, an additional permeation path is provided for the compound, and the comprehensive measures effectively improve the transdermal absorption efficiency and the biological activity of the compound.

The invention discloses a two-component polyurethane heat-conducting structural adhesive and a preparation method thereof, and relates to the technical field of polyurethane heat-conducting structural adhesives. The coating comprises a component A and a component B, the component A is prepared from the following components in parts by mass: 40 to 50 parts of modified polycarbonate polyol, 30 to 40 parts of modified polyether polyol, 15 to 25 parts of modified aluminum oxide filler and 1 to 3 parts of silane coupling agent; the modified polycarbonate polyol is obtained by adding 2-sulfonic terephthalic acid and a first catalyst into polycarbonate polyol; the modified polyether polyol is obtained by adding 3-phenylpropionic acid p-nitrophenyl ester and a second catalyst into polyether polyol; the modified aluminum oxide filler is obtained by adding an aluminum oxide filler into potassium perfluorooctane sulfonate; the component B is prepared from the following components in parts by mass: 20 to 30 parts of diphenylmethane diisocyanate, 40 to 50 parts of modified polycarbonate polyol, 1 to 3 parts of a dewatering agent and 20 to 30 parts of modified aluminum oxide filler. The two-component polyurethane heat-conducting structural adhesive prepared by the invention has better flexibility and impact resistance, and the stability of the two-component polyurethane heat-conducting structural adhesive is improved.

The present invention refers to a new enzymatic process for obtaining 17α-monoesters of cortexolone and / or its 9,11-dehydroderivatives starting from the corresponding 17α,21-diesters which comprises an enzymatic alcoholysis reaction. Furthermore, the present invention refers to new crystalline forms of cortexolone-17α-propionate and 9,11-dehydro-cortexolone 17α-butanoate.

The invention belongs to the technical field of building materials, and provides an early-strength cement-based grouting material and a preparation method thereof.The early-strength cement-based grouting material is prepared from, by weight, 500-600 parts of sulphoaluminate cement, 200-300 parts of Portland cement, 40-100 parts of lithium slag, 1-3 parts of a coagulant, 0.5-1 part of an early strength agent, 5-8 parts of a water reducing agent, 0.5-2.5 parts of a thickening agent, 0.3-0.9 part of a defoaming agent and 260-310 parts of water; the coagulant is sodium metaaluminate and / or potassium metaaluminate; the early strength agent is selected from one or more than two of lithium carbonate, lithium sulfate, calcium formate, calcium acetate, calcium propionate, calcium butyrate and nano silicon dioxide. According to the technical scheme, the problems of poor dispersion resistance and low early strength of a cement-based grouting material in a flowing water environment in the prior art are solved.

The invention relates to a method for controlling wheat septospora which is resistant to a C14-demethylase inhibitor fungicide. The present invention relates to a method for controlling wheat septospora on a cereal plant, which wheat septospora comprises at least one mutation in the CYP51 gene and is resistant to a C14-demethylase (in sterol biosynthesis) inhibitor fungicide (DMI fungicide), the method comprises applying to these plants, seeds or soil of the plants a fungicidally effective amount of (I) methyl 2-[2-chloro-4-(4-chlorophenoxy) phenyl]-2-hydroxy-3-(1, 2, 4-triazol-1-yl) propionate or (II) 2-[2-chloro-4-(4-chlorophenoxy) phenyl]-2-hydroxy-3-(1, 2, 4-triazol-1-yl) propionic acid.

The invention relates to the technical field of water purification, in particular to an integrated iron and manganese removal water treatment process which comprises the following steps: raw water aeration and coagulation treatment, iron removal, ammonia nitrogen removal and manganese removal, and the raw water aeration and coagulation treatment step is as follows: raw water is subjected to aeration treatment after being pre-oxidized by ozone; the raw water subjected to aeration treatment is input into a reaction tank, a coagulant is added into the reaction tank, the dosage of the coagulant is 8-20 mg / L, the contact time of the raw water subjected to aeration treatment and the coagulant is 20-300 s, and primary treatment water is prepared; the coagulant is prepared from the following raw materials in parts by weight: 8 to 12 parts of polyacrylamide, 2 to 4 parts of organic soluble sol and 0.4 to 0.8 part of trimethylolpropane tri [beta-(aziridinyl) propionate]. The device has the advantage of improving the precipitation rate of insoluble impurities in underground water.

A polyelectrolyte hydrogel coating with strong substrate binding performance and a method of manufacturing the same are provided. The method includes: 1) activating a substrate by applying oxygen plasma; and 2) dissolving a polycationic polymer, a polymeric monomer, a silane coupling agent and an initiator to obtain a precursor solution, vacuumizing the precursor solution to remove air bubbles, applying the vacuumized precursor solution to a surface of the substrate activated by the oxygen plasma, and performing an in-situ polymerization and curing process under nitrogen or rare gas atmosphere. The polymeric monomer includes at least one of: acrylamide, acrylic acid, hydroxyethyl methacrylamide, 2-acrylamido-2-methyl-1-propanesulfonic acid, polyethylene glycol (diol) diacrylate, 2-methacryloxyethylphosphocholine, 3-[[2-(Methacryloyloxy)ethyl]dimethylammonio]propane-1-sulfonate, and 3-[[2-(methacryloyloxy)ethyl]dimethylammonium] propionate. The silane coupling agent has a carbon-carbon double bond functional group.

The disclosure provides leather articles and a method for making leather articles comprising a substrate and a coating comprising a cellulose derivative having improved colorfastness to rubbing. The cellulose derivative may be methyl cellulose, ethyl cellulose, ethyl methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl methyl cellulose, ethyl hydroxyethyl cellulose, cellulose acetate, cellulose triacetate, cellulose propionate, cellulose acetate propionate, cellulose acetate butyrate, microcrystalline cellulose, cellulose nitrate, or cellulose sulfate.