36 results about "N-vinylimidazole" patented technology

The invention relates to the use of a composition containing, preferably in a physiologically acceptable medium comprising an aqueous phase, at least one oxidation-sensitive hydrophilic active principle selected from the group consisting of ascorbic acid and its derivatives and at least one non-crosslinked N-vinylimidazole polymer or copolymer, the active principle and the polymer or copolymer both being present in the aqueous phase, for promoting the synthesis of epidermal ceramides and/or for improving the barrier function of the skin, among other uses.

The invention discloses a functional polymer. The functional polymer is a random copolymer consisting of N-vinylimidazole structural unit and 2-mercaptobenzothiazole derivative structural unit, and the weight-average molecular weight of the random copolymer is 6,000 to 15,000; and the molar percentage content of the N-vinylimidazole structural unit in the random copolymer is 20 to 45 percent, and the molar percentage content of the 2-mercaptobenzothiazole derivative structural unit is 55 to 80 percent. The invention also discloses a preparation method for the functional polymer and application. The polymer structure contains bonding points of an imidazole ring and S and N heteroatom groups easily coordinated with heavy metal ions, so the polymer prepared by the method and a film thereof can selectively adsorb and detect the heavy metal ions in the water.

The invention relates to polymer hydrogel and a preparation method thereof. The polymer hydrogel comprises polymerized N-vinyl imidazole and hydroxyethyl acrylate, wherein the molar ratio of the N-vinyl imidazole to the hydroxyethyl acrylate is 1:1 to 1:9. The preparation method comprises the following steps of: uniformly mixing the N-vinyl imidazole, the hydroxyethyl acrylate and water; then charging nitrogen, and polymerizing by adopting high-energy ray irradiation at the temperature of minus 63 DEG C to minus 95 DEG C to obtain the polymer hydrogel. The polymer hydrogel provided by the invention has a good pore structure, contains multiple functional groups capable of adsorbing heavy metals, has high capacity of adsorbing ions including Pb<2+>, Cr<3+>, Cd<2+> and Cu<2+>, can effectively adsorb and chelate heavy metal ions, has certain mechanical strength and long service life, and can be used for sewage treatment. In the preparation method, an initator does not need to be added so that the pureness of the polymer is ensured; and the preparation method is simple and easy to operate.

Use of polymers of 30-65% by weight of N-vinylcaprolactam, 35-65% by weight of a monomer mixture of N-vinylimidazole and vinylpyrrolidone, where the weight ratio of N-vinylimidazole to vinylpyrrolidone is between 0.085 and 0.30, 0-15% by weight of a nitrogen-containing quaternizable monomer (A), which is different from N-vinylimidazole, where the sum of monomer (A) and N-vinylimidazole is less than 18% by weight, in cosmetic preparations.

The invention relates to a polyimidazole ionic liquid based copolymer, and a preparation method and an application thereof, belonging to the field of adsorbent synthesis. The preparation method comprises the following steps: weighing N-vinylimidazole and dichloroalkane, then adding the N-vinylimidazole and the dichloroalkane into a reactor, adding acetonitrile, carrying out uniform mixing, carrying out a reaction at 70 to 80 DEG C for 8 to 12 h, carrying out reduced pressure distillation to remove the acetonitrile, and carrying out washing and purifying so as to obtain an imidazole ionic liquid with a formula of [CxVmir][Cl]; and subjecting the imidazole ionic liquid with the formula of [CxVmir][Cl], N,N-methylene bisacrylamide MBA, divinyl benzene DVB and the acetonitrile to ultrasonic and uniform stirring, adding potassium persulfate, carrying out a reaction at 70 to 80 DEG C for 18 to 24 hours, and carrying out cooling, vacuum filtering, washing, purifying and vacuum drying so as toobtain a target product namely the polyimidazole ionic liquid based copolymer with a formula of DVB-p[CxVmir][Cl]. The preparation method provided by the invention is simple and safe, has high adsorption efficiency to rhenium, is energy-saving and environmentally-friendly, and has large adsorbing capacity and application practicality.

The invention relates to a composition containing, preferably in a physiologically acceptable medium comprising an aqueous phase, at least one oxidation-sensitive hydrophilic active principle selected from the group consisting of ascorbic acid and its derivatives and at least one non-crosslinked N-vinylimidazole polymer or copolymer, the active principle and the polymer or copolymer both being in the aqueous phase, useful for preventing and/or treating cutaneous signs of intrinsic ageing.

The invention relates to the use of a composition contains at least one oxidation-sensitive hydrophilic active principle selected from the group consisting of ascorbic acid and its derivatives and at least one non-crosslinked N-vinylimidazole polymer or copolymer, the active principle and the said polymer or copolymer both being in the aqueous phase, for lightening and/or depigmenting the skin and/or hair, including body hair.

The invention relates to a method for preparing heat insulating polyurethane automotive trim leather. The method includes the following steps that a, the surface of release paper is coated with waterborne polyurethane dispersion, the release paper is placed at the temperature of 110-120 DEG C, and a surface layer is obtained after drying; b, the surface of the surface layer is coated with polyurethane and an expanding agent through mechanical foaming, then the surface layer is placed at the temperature of 110-120 DEG C to be dried for 20-40 min, and a porous foaming layer is formed; c, base cloth is attached to the foaming layer, the foaming layer is placed at the temperature of 100-120 DEG C to be cured for 10-15 hours, then, separation and winding are conducted, and the heat insulating polyurethane automotive trim leather is obtained. The waterborne polyurethane dispersion comprises, by mass, 75-80% of polyurethane resin, 10-15% of N-vinyl imidazole onium salt polymers, 3-5% of swelling powder, 1-2% of defoaming agent, 1-2% of flatting agent, 1-5% of nano graphene and 1-3% of feeling agent. The number-average molecular weight of the polyurethane resin is 1,000-5,000. The molecular structure general formula of the N-vinyl imidazole onium salt polymers is shown in the specification, and the number-average molecular weight of the N-vinyl imidazole onium salt polymers is 1,000-5,000. A vacuum environment can be formed, and no molecule exists in the vacuum environment so that heat cannot be conducted, and the good heat insulating effect is achieved.

The invention relates to an aerosol device containing a hair composition for hair styling which comprises, in a cosmetically acceptable aqueous medium, at least one copolymer based on N-vinylpyrrolidone and N-vinylimidazole units having a molecular weight greater than 100 KDaltons, and dimethyl ether as propelling agent. The invention also relates to the use of this device and to a method of hair treatment.

The invention relates to a polymer hydrogel-based nano iron oxide which comprises polymer hydrogel formed by hydroxyethyl acrylate and N-vinyl imidazole in a polymerization form, and nano iron oxide is loaded on the polymer hydrogel, wherein the molar ratio between the hydroxyethyl acrylate and the N-vinyl imidazole is (1-9):1. A preparation method of the polymer hydrogel comprises the following steps of: (1) evenly mixing the hydroxyethyl acrylate, the N-vinyl imidazole and distilled water in a certain proportion, wherein the volume ratio of the mixture of the hydroxyethyl acrylate and the N-vinyl imidazole to the water is (1-2):5, and the molar ratio of the hydroxyethyl acrylate to the N-vinyl imidazole is (1-9):1; (2) after mixing, carrying out ultrasonic treatment for 7-13 minutes; (3) filling inert gas into the mixture obtained in the step (1) for guaranteeing an anaerobic state; and (4) adopting high-energy ray with the radiation dosage of 1*10<4>-1*10<8>Gy to irradiate the polymer hydrogel formed by polymerization within the temperature range of minus 63 DEG C to minus 95 DEG C.

The invention provides a reagent for reducing the condensation point of diesel, and a preparation method and an application thereof. The reagent for reducing the condensation point of diesel comprisesa tetradecyl methacrylate-N-vinylpyrrolidone copolymer, or comprises the tetradecyl methacrylate-N-vinylpyrrolidone copolymer and a tetradecyl methacrylat-N-vinylimidazole copolymer. The above polymer diesel pour point depressant can further improve the low-temperature fluidity of the diesel, and has the advantages of simple synthesis method, small dosage, and small use amount of raw materials. The condensation point of diesel containing the reagent is 24-26 DEG C less than that of diesel free from the pour point depressant, and the cold filter plugging point of the diesel containing the reagent is 9-11 DEG C less than that of the diesel free from the pour point depressant, so that the diesel has a good fluidity at a low temperature.

The invention relates to a method for preparing N-vinyl imidazole, comprising the steps of: carrying out substitution reaction on imidazole and first alkali metal hydroxide at a temperature of 50-90 DEG C in deionized water under the existence of an acid binding agent so as to generate imidazole alkali metal salt; adding the generated alkali metal salt into solution of dichloroethane and alcohol; carrying out the substitution reaction at a temperature of 60-100 DEG C so as to generate chloroethane imidazole; finally adding second alkali metal hydroxide into the chloroethane imidazole and carrying out elimination reaction at a temperature of 65-95 DEG C; after the reaction is finished, filtering and removing the alkali metal salt; reducing pressure and distilling out water, unreacted dichloroethane and alcohol at a temperature of 80-90 DEG C; and continuing raising the temperature to 100-110 DEG C and carrying out reduced pressure distillation so as to obtain the N-vinyl imidazole. The method provided by the invention has the advantages of little environmental pollution, low production cost, good product quality and high yield.

The invention relates to a self-emulsifying aqueous low-temperature epoxy resin curing agent based on a heterocyclic compound, and a formula comprises: 6-10 parts of N-vinylimidazole, 3-5 parts of aminoalkyl acrylate, 1-2 parts of N-vinylpyrrolidone, 1-2 parts of a reactive emulsifier, 15-30 parts of water, 0.05-0.1 part of an initiator, 0.02-0.05 part of a chain transfer agent, and 3-5 parts of ethanol. The curing agent of the invention can perform at a low temperature, has a high drying speed at normal temperature, overcomes the shortcoming of slow curing speed of a conventional aqueous curing agent/epoxy resin system; and the cured epoxy resin has high hardness.

The invention relates to a compounded diesel pour point depressant, and a preparation method and an application thereof. The compounded diesel pour point depressant comprises, by weight, 20-80 parts of a polar nitrogen-containing compound and 20-80 parts of a tetradecyl methacrylate-N-vinylimidazole pour point depressant. The compounded diesel pour point depressant is prepared by uniformly mixingthe polar nitrogen-containing compound with the tetramethyl methacrylate-N-vinylimidazole pour point depressant. The compounded diesel pour point depressant is added to diesel when applied, and the mass percentage content of the compounded diesel pour point depressant in the diesel is 0.1-0.5%. Compared with diesel pour point depressants in the prior art, the compounded diesel pour point depressant of the present invention contains the polar nitrogen-containing compound, can reduce the condensation point of the diesel by 14-18 DEG C and reduce the cold filter plugging point by 6-8 DEG C in test after being added to the diesel, solves the problem of poor effect of the diesel pour point depressants at a low temperature, and can further improve the low temperature fluidity of the diesel and improve the low temperature flowing performance.

This invention belongs to the technical field of chemical production and provides a method for environmentally-friendly and efficient production of electrolytic metal manganese and an electrolytic additive. A poly N-vinyl imidazole and N-vinyl imidazole-acrylic copolymer is used as an electrolysis additive and is added to the electrolyte containing manganese sulfate and ammonium sulfate for electrolytic manganese production when being used, and the content of the electrolysis additive in the electrolyte is controlled to be 1 to 40 mg/L. The electrolysis additive is an environmentally-friendly non-toxic polymer, can be used for replacing currently and widely used toxic or pollution-carrying selenium dioxide and sulfur dioxide, is very small in solubility, does not accumulate in the electrolyte and is simple to operate in the production process, the metal manganese electrolysis efficiency is high, the product purity is high, the electrolytic process is stable, the purity requirement for the electrolyte is lower, the difficulty and the cost of electrolytic metal manganese production are reduced, and the electrolytic metal manganese has higher promotion and application value.

The invention provides a synthesis method of imidazole ionic liquid 1-allyl-3-vinylimidazole acetate. The synthesis method comprises the following steps: carrying out one-step reaction on N-vinylimidazole and allyl chloride to obtain an ionic liquid intermediate 1-allyl-3-vinylimidazole chloride salt at first, and then carrying out anion exchange on the intermediate and potassium acetate to obtain1-allyl-3-vinylimidazole acetate ([AVIM] [OAc]). The ionic liquid 1-allyl-3-vinyl imidazole acetate can be used as a solvent and can be used for dissolving biological macromolecules such as starch and cellulose.

The invention relates to mixtures comprising A) at least one copolymer obtainable by (i) free-radically initiated solution polymerization of a monomer mixture of (a) 0.01 to 99.99% by weight of at least one monomer chosen from the group consisting of N-vinylimidazoles and diallylamines, optionally in partially or completely quaternized form; (b) 0.01 to 99.99% by weight of at least one neutral or basic water-soluble monomer which is different from (a); (c) 0 to 50% by weight of at least one unsaturated acid or an unsaturated anhydride; (d) 0 to 50% by weight of at least one free-radically copolymerizable monomer which is different from (a), (b) and (c); and (e) 0 to 10% by weight of at least one monomer having at least two ethylenically unsaturated nonconjugated double bonds which acts as crosslinker, and (ii) subsequent partial or complete quaternization or protonation of the polymer where the monomer (a) is not quaternized or only partially quaternized and B) at least one inorganic UV filter and to the use thereof for the preparation of cosmetic or dermatological light protection agent preparations.

The invention relates to a method for preparing a pressure retarded osmosis membrane modified by a zwitterionic random copolymer. The method comprises the steps that methyl-2-[methyl-(4-pyridine)dithiocarbonate]propionate is used as a chain transfer agent, azobisisobutyronitrile is used as an initiator, N-vinylimidazole and an N-vinylphthalimide monomer containing an amino protecting group are subjected to random copolymerization; a poly N-vinylimidazole chain segment is subjected to quaternization under the action of propane sultone and 4-bromobutyric acid separately; under the action of hydrazine hydrate, a poly(N-vinylphthalimide)chain segment is subjected to amino deprotection to obtain a zwitterionic polymer; and the zwitterionic polymer is prepared into an aqueous solution to be grafted and modified on a porous support layer of an osmosis composite membrane. A comonomer used in the method is simple and easy to obtain, the random copolymer is convenient to synthesize, the condition is mild, and realization is easy; the chemical stability and water solubility of a graft polymer are improved, and the cost is greatly reduced; and excellent anti-protein and microbial adhesion areachieved.