35 results about "N,N-Methylenebisacrylamide" patented technology

The invention discloses a polyacrylamide microgel as well as a preparation method and application thereof. The particle size of the polyacrylamide microgel is 30-150 micrometers, acrylamide, sodium acrylate, N,N'-bisacrylamide, 2-acrylamide-2-methylpropanesulfonic acid sodium, styrenesulfonate and the like serve as polymerized monomers, white oil and the like serve as disperse phases, and the polymerized monomers and the disperse phases are subjected to thermal initiation suspension polymerization to obtain the polyacrylamide microgel. The polyacrylamide microgel synthetized by the method can be directly injected into an oil layer without being processed and has a good plugging effect.

The invention discloses a method for producing a high-density and low-cost zinc oxide aluminum sputtering target. The method comprises the following steps of: selecting ZnO powder and Al2O3 powder as main raw materials; fully dissolving methyl acrylamide monomer and N-N' methylenebisacrylamide in pure water to form premixed solution, adding dispersants such as tetramethyl ammonium hydroxide and the like, adding the powder raw materials, stirring, pulping, regulating the pH value, and performing ball milling for over 6 hours to obtain pulp; adding organic degassing agent and ammonium persulfate initiator into the pulp, vacuumizing, stirring, degassing, and pouring the pulp into a die; heating the die to the temperature of between 50 and 70 DEG C, and initiating cross-linking curing reaction of gel monomer; releasing the cured wet blank from the die, and drying the wet blank to obtain a target biscuit; and performing un-sticking, high-temperature sintering and machining on the biscuit in a circulated air furnace to manufacture the zinc oxide aluminum sputtering target with relative density of over 98 percent and uniform chemical composition and microstructure.

The invention relates to a self-reinforced hybrid hydrogel used for artificial muscles and a preparation method thereof. According to the invention, sodium alginate is used as a high-molecular skeleton, acrylamide and derivative thereof are used as polymerizable monomers, divinyl benzene, N,N'-methylene bis acrylamide or ethylene glycol dimethacrylate is used as a chemical cross-linking agent, an aqueous metal salt solution is used as an ion cross-linking agent, and then the hydrogel with high elasticity and high toughness is prepared. During a process of preparing the hydrogel, an organic matter emulsion containing metal ion aqueous solution is added. When the prepared hydrogel is stretched by external forces to a certain extent, the gel deforms to extrude the organic matter emulsion, and metal ions are released and then crosslinked with the sodium alginate in the hybrid gel, thereby substantially improving gel intensity and preventing gel fracture. The preparation method has advantages of good controllability, simple technology and low cost, the obtained hydrogel material can be self-reinforced, and is expected to be applied in fields of artificial cartilage, artificial muscle, flexible robot manufacture, etc.

The invention discloses a method for preparing double-crosslinking amphoteric tapioca starch. The method includes: using tapioca starch as main materials, water as solvent, hydroxide 1-butyl-3-methyl imidazole and sodium hydroxide as catalysts for etherification reaction, and N, N'-methylene bisacrylamide as inner-crosslinking agent to enable the starch to be in a meshed form, and preparing double-crosslinking amphoteric tapioca starch by means of outer crosslinking of epichlorohydrin and modification of amphoteric agent such as dimethyl diallyl ammonium chloride cation monomers, monochloro acetic acid and the like to enable the tapioca starch to integrate advantages of crosslinking starch and amphoteric starch. The double-crosslinking amphoteric tapioca starch has high application value in papermaking auxiliaries, cosmetics and the like. Further, since the double-crosslinking amphoteric tapioca starch is swellable in water but insoluble, application of the double-crosslinking amphoteric tapioca starch in sewage treatment is more effective.

The invention discloses a method for preparing super absorbent resin with a cross-linked structure from potato starch phosphate graft co-polymeric acrylic acid and a sodium salt thereof. The method comprises the following main technological processes of: under ice water bath cooling, performing neutralization reaction between a sodium hydroxide solution and acrylic acid used for removing a polymerization inhibitor so as to prepare the acrylic acid and a sodium salt solution of the acrylic acid; mixing the prepared acrylic acid and the sodium salt solution of the acrylic acid with potato starch phosphate; adding an initiator of persulfate, a crosslinking agent of N,N'-methylene bi-acrylamide so that the mixture is mixed evenly under stirring; then under the protection of nitrogen gas, heating the mixture in a water bath and stirring the mixture so that the potato starch phosphate performs graft copolymerization with the acrylic acid and the sodium salt solution of the acrylic acid; stopping stirring after reaching a certain temperature, performing heat preservation reactions, and then stopping introducing the nitrogen gas; and taking out a product, cutting the product into small pieces, drying the small pieces in a drying oven to have constant weights, and crushing the small pieces to obtain the super absorbent resin.

The invention relates to a method for preparing a bleaching bamboo pulp cellulose water absorbing material. The method is characterized by comprising the following preparation steps of: stewing bleaching bamboo pulp by a sulfate process; carrying out subsequent four-section bleaching with oxygen delignification, chlorine dioxide, peroxide and chlorine dioxide to prepare the bleaching bamboo pulp fiber; defibrinating and pretreating the bleaching bamboo pulp fiber by a PFI beater; carrying out graft copolymerization synthesis on the defibrinated bleaching bamboo pulp fiber with an aqueous solution polymerization method, i.e. taking ammonium persulfate as initiator, and taking N-N'-bisacrylamide as a crosslinker; meanwhile, and finishing the graft copolymerization synthesis by taking crylicacid and acrylamide as the monomers; and precipitating and washing the copolymerization composite with absolute ethyl alcohol, freezing, drying, grinding, then freezing, drying, and sealing to obtainthe finished product. The water absorbing material prepared with the method has high water absorbing efficiency and can effectively develop and utilize the bleaching bamboo pulp cellulose.

The invention relates to a preparation method for a nafcillin molecular imprinting adsorbent. The preparation method for the the nafcillin molecular imprinting adsorbent takes functionalized illite as a substrate, takes nafcillin as a template molecule, takes methylacrylic acid (MAA) as a functional monomer, takes N, N'-methylene bisacrylamide (MBAA) as a cross-linking agent, takes a catalyst copper chloride (CuCl2) and a ligand N, N, N', N", N"-pentamethyldiethylenetriamine (PMDETA) as a catalytic system, and takes ascorbic acid (AsAc) as a reducing agent through an atom transfer radical polymerization (AGET ATRP) process which adopts electron activation transfer to generate a catalyst; and the preparation method is used for selectively recognizing and separating nafcillin. The method is low in cost and simple in preparation, and a product has high recognition, high selectivity and high separation and enrichment capacity on a target molecule.

The invention discloses a pectin/acrylamide semi-interpenetrating hydrogel material. The material is composed of pectin, acrylamide and the chemical cross-linking agent N,N'-methylene bisacrylamide, wherein a mass ratio of pectin to acrylamide is 17-50: 83-50, and the mass of N,N'-methylene bisacrylamide is 1.7 to 6.7% of the total mass of monomers. A preparation method for the material comprises the following steps: mixing and dissolving pectin, acrylamide and N,N'-methylene bisacrylamide; and allowing acrylamide to undergo crosslinking and copolymerization under the action of N,N,N',N'-tetramethyl diethylamine and potassium persulfate so as to form a pectin/acrylamide semi-interpenetrating hydrogel. The method has the advantages of simple process, low cost, convenience in industrial popularization and application, etc. The pectin/acrylamide semi-interpenetrating hydrogel has the advantages of good biosecurity, degradability, good mechanical strength, a high swelling rate, pH-sensitivity and capacity of adsorbing harmful chemical substances like dye and metal ions, so the pectin/acrylamide semi-interpenetrating hydrogel can be used for adsorption separation of chemical substances and sewage treatment.

The invention provides a technique for producing alumina foamed ceramic by gelcasting, relating to a production method of alumina foamed ceramic for refining and filtering aluminum alloy, copper alloy and high-temperature molten steel. The technique comprises the following steps: heating a polyurethane foam sodium hydroxide water solution, washing with water until no alkaline liquor is residual, and drying; mixing powder alumina, monomer acrylamide, initiator ammonium persulfate, cross-linking agent N,N'-methylene-bis-acrylamide and toughener zirconium dioxide with water; immersing the dried polyurethane foam in the slurry, and carrying out slurry dipping and extrusion repeatedly, thereby obtaining the biscuit; putting the biscuit in a drying oven, and carrying out polymerization reaction on the monomer to obtain a gelcasting body; and putting the gelcasting body in a high-temperature furnace, and naturally cooling to obtain the product. The invention has the advantages of no need of any dispersant for preparing the slurry, simple formation equipment, low cost and the like, and can form complicated shapes; and in particular, the net dimension stability of the product is high, thereby greatly reducing the probability of biscuit cracking due to dimension shrinkage in the normal-temperature drying period and the early sintering period.

The invention relates to a method for synthesizing a selective adsorption film material of ofloxacin, which is mainly and technically characterized in that the ofloxacin is used as a template molecule, acrylamide and methyl methacrylate are used as functional monomers, N,N'-methylene bisacrylamide is used as a crosslinking agent, and an ammonium persulphate solution and tetramethyl ethylene diamine are used as initiating agents so as to synthesize an adsorption film material with high selectivity to the ofloxacin. According to the method for synthesizing the selective adsorption film material of the ofloxacin, the process is scientific, the cost is low, the operation is simple and quick, and the reaction condition is easy to control. The polymer film material used as an adsorbent can be selectively used for enriching a trace ofloxacin medicine in animal foods.

The invention discloses a method for preparing high viscosity polyanionic cellulose, comprising the following steps with refined cotton as the cellulose raw material of alkalizing cellulose, mixing cellulose by adding an etherifying agent, etherifying cellulose, neutralizing and washing, and performing post treatment of the product; and the preparation method further comprises the step of crosslinking reaction which is performed between the step of etherifying cellulose and the step of neutralizing and washing by adding a crosslinking agent N,N'-methylene-bis-acrylamide into polyanionic cellulose to perform crosslinking reaction. The invention is a solution to the problem that the polyanionic cellulose obtained by the traditional method for preparing high viscosity polyanionic cellulose has low viscosity, poor salt tolerance and high filtration loss.

The invention belongs to a method for improving oil-water adsorption selectivity of an oil adsorbing separating purifying dewatering material sodium polyacrylat. The method mainly consists of the following steps: (1) taking N, N'-Methylenebisacrylamide as a cross-linking agent, potassium persulphate as an initiator and cyclohexane as a continuous phase, adjusting the amount of the cross-linking agent, and employing inverse suspension polymerization to prepare a series of sodium polyacrylat dewatering resin materials; (2) respectively determining dewatering performance and oil-water adsorption selectivity of a series of the sodium polyacrylat dewatering resin materials; and (3) according to the performance data of a series of the sodium polyacrylat dewatering resin materials, drafting a curve map to determine optimum balance control amount of the cross-linking agent, and adopting the optimum balance control amount of the cross-linking agent to prepare an adsorptive resin material with high dewatering performance and high adsorption selectivity.

The present invention relates to a polyacrylamide microgranular flocculent containing polyoxyethylene branched chain crosslinked cation. It is a transparent or semitransparent microlatex whose average grain size is 40-90 nm, dispersion coefficient is 0.50-0.70 and 0.1% aqueous solution viscosity is 1.2-2.0 mPa.s, and is obtained by using acrylamide, (methyl) acryloyloxyethyltrimethyl ammonium chloride, acryloyl terminal polyoxyethylene macromonomer and N,N'-methylene diacrylamide through reversed phase microemulsion four-component copolymerization preparation process. Said invention utilizes the addition of EDTA chelating agent and water-soluble azo after accelerating agent to raise monomer conversion rate and obviously raise flocculeting effect.

The invention discloses a method for preparing a temperature stimuli responsive intelligent chromatographic column, which comprises the following steps of: A, uniformly mixing N-Isopropyl acrylamide, N,N'-methylene-bis-acrylamide, polyethylene glycol-20,000, 10 percent w/v ammonium persulfate and deionized water by using ultrasonic waves; B, deoxidizing reaction products in the step A, adding 10 percent v/v N,N,N',N'-tetramethyl ethylene diamine, and uniformly mixing fully; and C, pouring reaction products in the step B into a stainless steel chromatographic column tube, performing reaction at the temperature of between -18 and 60 DEG C for 10 to 100 hours, arranging chromatographic column heads at two ends of the column tube, connecting the column tube to a high pressure pump, and washing the chromatographic column body by using ultrapure water as a mobile phase. The method has the advantage of simple process; the prepared monolithic column has good pore structure, high mechanical strength and high column efficiency; during use, the water is taken as the mobile phase, so the waste and pollution caused by using a large quantity of organic solvent can be avoided; and in the separation process, the action force between reagents and the monolithic column can be controlled only by changing temperature, so the separation is simple and feasible, and the separation effect is good.

The invention discloses a method for a double-parent potassium-containing super absorbent resin. The method mainly comprises the following process steps of: under the cooling action of an ice-water bath, performing a neutralization reaction on solution of potassium hydroxide and acrylic acid from which a polymerization inhibitor is removed; mixing carboxymethyl starch, starch phosphate and deionized water; adding the acrylic acid and sylvite solution thereof, potassium persulfate serving as an initiator and solution of N,N'-methylene bisacrylamide serving as a cross-linking agent; stirring under the protection of nitrogen gas and heating in a water bath so as to perform graft polymerization on the carboxymethyl starch, the starch phosphate, the acrylic acid and sylvite thereof; and reacting while preserving heat, drying and grinding so as to obtain the double-parent potassium-containing super absorbent resin taking the carboxymethyl starch and the starch phosphate as raw materials. The super absorbent resin prepared by the method has high water absorption, contains nutrient elements such as potassium and phosphorus and has wide application prospect in the aspects of water conservation of soil, desertification control, promotion of plant growth and the like.

The invention belongs to the technical field of a composite material used for a communication product, and especially relates to a high-strength insulating material for communication cables. The high-strength insulating material comprises the following component in parts by weight: 60-70 parts of chlorinated polyethylene rubber; 4-7 parts of sodium stearate; 20-28 parts of cellulose fiber; 9-12 parts of sodium bicarbonate; 15-18 parts of polyethylene terephthalate; 6-9 parts of sodium dodecylbenzene sulfonate; 4-6 parts of N-N'-methylenebisacrylamide; and 10-14 parts of benzoate. The modifiedcellulose fiber with low cost is used as a reinforcing material, which greatly reduces the production cost, and the material has high mechanical strength, and can be widely used.

Disclosed are polyamidoamines having a number average molecular weight ranging between 1,000 Da and 200,000 Da, obtained by copolymerisation of N,N-methylenebisacrylamide, glycine and 4-aminobutylguanidine (agmatine), and having the following formula (I) wherein n and m are two numbers such that the value of (n+m) can range from 5 to 1,000, preferably from 20 to 200, and even more preferably from 45 to 55. The compounds according to the invention are useful as active ingredients of pharmaceutical compositions for the treatment and/or prevention of microbial infections, or as plant protection products to counteract bacterial and fungal pathogens in organic farming.