24 results about "Meth-" patented technology

The present invention concerns a process for separation of a monomer including at least one double bond, hereafter referred to as “monomer,” in particular (meth)acrylic acid, from a composition Z including this monomer and at least one impurity different to the monomer, including the steps of bringing into contact of the composition Z with an additive by forming a separation phase. The additive has a melting point of at most about 150° C. and a vapour pressure at a temperature of 20° C. of at most about 1 mbar. The monomer is then separated from the separation phase. A device for producing a monomer, the use of additives in the separation of a monomer from a monomer-comprising composition, the monomer obtainable by the process according to the invention, chemical products comprising the monomer as well as the use of the monomer in or for production of chemical products.

A curable resin composition which contains a curable resin (A) having two or more polymerizable unsaturated bonds in a molecule, and polymer microparticles (B), and which optionally further contains an epoxy resin (C) and a low-molecular-weight compound (D) having a molecular weight less than 300 and having at least one polymerizable unsaturated bond in a molecule,

• • wherein the content of component (B) is 1 to 100 parts by mass per 100 parts by mass of the sum of component (A) and component (D),
  • the content of the epoxy resin (C) is less than 0.5 parts by mass per 100 parts by mass of the sum of component (A) and component (D),
  • component (A) has an epoxy (meth)acrylate content less than 99 parts by mass per 100 parts by mass of the whole component (A), and
  • component (B) has been dispersed in the state of primary particles in the curable resin composition.

A transparent polyimide film, prepared from a copolymerized polyamide acid according to a chemical cyclization method, is provided. The copolymerized polyamide acid requires at least a semi-aromatic polyamide acid, and the semi-aromatic polyamide acid is formed by reacting cyclobutane-1,2,3,4-tetracarboxylic dianhydride (CBDA) and 2,2′-bis(trifluoromethyl)diaminodiphenyl (TFMB). The molar number of dianhydrides of the semi-aromatic polyamide acid is more than 20% of the total molar number of anhydrides of the copolymerized polyamide acid, so that the transparent polyimide film has a light transmittance greater than 80%, a chroma b* less than 5, and a CTE less than 35 ppm/° C.

The present invention is a method of producing a (meth)acrylic acid based water-soluble polymer having a content of groups in neutralized state of not more than 90 mole percent, where the sum total of acid groups and groups in neutralized state contained in the (meth)acrylic acid based water-soluble polymer is taken as 100 mole percent, which comprises a photopolymerization step of polymerizing a monomer component by irradiating near-ultraviolet rays to a reaction mixture, the said reaction mixture comprising the monomer component, a photopolymerization initiator, a chain transfer agent and a polymerization solvent, the said monomer component containing not less than 50 mole percent of a (meth)acrylic acid monomer, with the whole monomer component subjected to polymerization being taken as 100 mole percent, and a concentration of the said monomer component in the reaction mixture at the time of polymerization being 40 to 97% by mass.

The invention relates to a phosphorus-free corrosion and scale inhibitor applicable to high-chlorine high-concentration-multiple circulating cooling water and a preparation method of the phosphorus-free corrosion and scale inhibitor, belonging to the technical field of water treatment. The technical problem to be solved by the invention is to provide the phosphorus-free corrosion and scale inhibitor with low toxicity, chloride resistance and low cost for high-concentration-multiple circulating cooling water containing high-concentration chloride ions. The phosphorus-free corrosion and scale inhibitor is prepared from the following raw materials in parts by weight: 3 to 5 parts of zinc sulfate, 4 to 7 parts of sodium gluconate, 2 to 4 parts of sodium molybdate, 0.5 to 2 parts of benzotriazole, 5 to 9 parts of and acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 7 to 12 parts of polyepoxysuccinic acid and 3 to 5 parts of hydrolyzed polymaleic anhydride. Compared with similar corrosion and scale inhibitors, the phosphorus-free corrosion and scale inhibitor for high-concentration-multiple circulating cooling water provided by the invention has the advantages of strongtargeting performance, low toxicity, chloride resistance, low cost, simple operation, convenience, rapidness, environmental friendliness, safety, high efficiency and the like.

The invention discloses wear-resistant and high-temperature resistant capacitor aluminum case film coating paint and a preparation method thereof. The wear-resistant and high-temperature resistant capacitor aluminum case film coating paint is mainly obtained through mixing and stirring compounds A and compounds B in raw materials according to certain weight parts, wherein the compounds A consist of polyurethane polyatomic alcohol, ethyl ketone, paraffin, isopropanol, polymethyl-benzene gadoleic acid methyl ester and attapulgite, and the compounds B consist of phenolic resin, dimethyl silicone polymer, acrylic ester copolymer modifying agents, straw ashes, silane coupling agents, 6-tertiary butyl-3-methylphenol, stearic acid and tetramethylsilane. The wear-resistant and high-temperature resistant capacitor aluminum case film coating paint has the advantages that the recipe is reasonable, the preparation method is simple, the curing effect on a capacitor aluminum case is good, a capacitor is effectively protected, the prepared film coating paint has the heat resistance performance and the wear resistance performance, and the service life of the capacitor is prolonged.

The invention discloses nitrogen-containing multi-degree-of-functionality acrylate resin. The structure of the nitrogen-containing multi-degree-of-functionality acrylate resin is shown in the following general formula namely FORMULA (I) (shown in the description), wherein R1, R2 and R3 are independently hydrogen or methyl, but R1 and R2 are not methyl at the same time; R4 is linear or branched k-valued alkyl with 2-18 carbon atoms, and the chain segment can contain a benzene ring or naphthenic group structure; m is equal to 0 or 1, n is an integer from 0 to 16, and k is equal to 2 or 3. The resin has the advantages of nitrogen-containing resin and multi-degree-of-functionality resin in photocuring application and is more excellent in application performance than an existing product; moreover, the invention provides a preparation method for the nitrogen-containing multi-degree-of-functionality acrylate resin, which is nonirritant, has no toxic or side effects, and is simple to operate and less in side reaction; the resin can be used in various photocuring fields of photocuring coatings, ink, adhesives and the like.

The invention discloses concrete for a prefabricated part and a preparation method thereof, which relate to the technical field of concrete, and solve the problems that harmful substances such as acidand alkali ions are easy to permeate inwards through tiny gaps and cracks of the concrete, so that the volume of a steel bar is expanded, and the prefabricated part is damaged. The concrete for a prefabricated part comprises the following components in parts by weight: 180-200 parts of Portland cement, 170 to 180 parts of water, 720 to 760 parts of medium sand, 1020 to 1050 parts of broken stone,70 to 80 parts of fly ash, 170 to 190 parts of mineral powder, 3 to 5 parts of a water reducing agent, 2 to 3 parts of a retarder, 4 to 8 parts of an anti-permeability agent, 6 to 10 parts of methylsodium silicate, 5 to 9 parts of triethoxysilane, and 15 to 35 parts of organic silicon water-soluble resin. The concrete for the prefabricated part has excellent chemical corrosion resistance, has agood protection effect on steel bars in the prefabricated part, and is good in overall application effect.

The invention relates to a preparation method of a self-supporting porous carbon electrode material, belonging to the technical field of electrode material preparation. The method specifically comprises the following steps: adding acrylamide, N,N'-methylene bisacrylamide, sodium carboxymethyl cellulose, potassium tetraborate and a chemical activator into water to obtain a mixed solution; then adding an initiator, and carrying out a free radical polymerization reaction at 65-75 DEG C to obtain hydrogel; freeze-drying the hydrogel to prepare xerogel; and carbonizing, washing and drying the xerogel to obtain the self-supporting porous carbon electrode material. The self-supporting porous carbon material is prepared from an acrylamide micromolecule raw material through the steps of free radical polymerization, freeze drying, carbonization and the like, the structure and performance of the prepared porous carbon can be conveniently regulated and controlled through reaction conditions, preparation process is simple, convenient and easy to control, and the obtained porous carbon electrode material is large in specific surface area and has excellent capacitance performance.

The invention provides a divided type dental polymeric core build-up material including a first paste (A) and a second paste (B), in which each of the pastes is a paste obtained by mixing at least a (meth)acrylate monomer, a filler having a particle size distribution within a range of 0.1 through 40 μm and an average particle diameter of 0.7 through 10 μm, and a fine particle filler having an average particle diameter of primary particles of 0.001 through 0.050 μm, and having a viscosity at 25° C. of 280 through 470 P, and in which one of the pastes includes an oxidant and the other includes a reductant and at least one of the pastes includes a photopolymerization catalyst. The divided type dental polymeric core build-up material of this invention has high operability in core build-up and forms a polymerically cured substance with a good mechanical property.

The invention discloses environment-friendly impermeable composite bentonite, and belongs to the field of green chemistry and environmental protection. The composite bentonite is prepared from the following components in parts by mass: 1000-1200 parts of bentonite, 90-120 parts of sodium carbonate, 300-500 parts of a biodegradable polyester material, 50-100 parts of a cross-linking agent, 30-50 parts of a drying agent and 30-50 parts of a preservative; wherein the bentonite is granular bentonite; the biodegradable polyester material is one of poly (trimethylene carbonate), polycaprolactone andpolyvalerolactone; the cross-linking agent is N-hydroxymethyl acrylamide; the drying agent is at least one of bamboo charcoal and quartz sand; and the preservative is copper sulfate. By adding the biodegradable material and the cross-linking agent, the composite bentonite has good anti-seepage performance, can be biologically degraded, and has a wind indicator effect on the development of green chemistry.

The invention discloses a wear-resistant sealing gasket and a preparation method thereof. The wear-resistant sealing gasket is prepared from the following components in parts by mass: 100 to 120 parts of vinyl polydimethylsiloxane, 10 to 15 parts of nano silicon dioxide, 40 to 60 parts of thiol modified chloroprene rubber, 1 to 15 parts of acrylonitrile butadiene rubber and 50 to 70 parts of hexamethyldisilylimide. The ratio of the nano silicon dioxide to the thiol modified chloroprene rubber to the hexamethyldisilylimine is (1-2): (4-6): (5-7). The wear-resistant sealing gasket is good in wear resistance, long in service life and capable of effectively prolonging the running time of whole equipment.

The invention provides a weak gelling agent, a preparation method of the weak gelling agent, a cement paste suspension stabilizer and application of the cement paste suspension stabilizer. The weak gelling agent is obtained by initiating reaction of raw materials through an initiator, and the raw materials comprise sodium p-styrenesulfonate, itaconic acid, acrylic acid, N, N '-dimethylacrylamide, N-isopropylacrylamide or N-hydroxymethyl acrylamide and N-vinyl pyrrolidone. The weak gelling agent can relieve the phenomena of dilution and viscosity reduction generated in well cementation construction. The invention further provides a cement paste suspension stabilizer which comprises a tackifying and shear strength improving agent and the weak gelling agent. The invention further provides application of the cement paste suspension stabilizer in well cementation construction at the temperature of 200 DEG C or above. The cement paste suspension stabilizer can ensure the safety of cementing and well cementation construction under high-temperature and ultrahigh-temperature working conditions, and can improve the packing effect and well cementation quality of a deep stratum.

The invention belongs to the field of organic synthesis, and discloses a method for synthesizing a naphthopyran-2-ketone compound. The method comprises the following step: in the presence of benzoquinone, palladium acetate, 3-(4-methoxyphenyl) thiopropane-1-sodium sulfonate and a solvent, a phenolic compound and butyl acrylate react to obtain the naphthopyran-2-ketone compound carrying out a reaction. The phenolic compound is selected from one of the following structures as shown in the specification, wherein R1 is selected from hydrogen, halogen, alkoxy and ester group, R3 is selected from hydrogen, alkyl, alkoxy, trifluoromethyl, acyl and naphthyl, and R2 is selected from hydrogen or halogen. The reaction conditions are simple and mild, only one catalyst is needed, the use amount of thecatalyst is small and only needs 10 mol%, the reaction starts from olefin carboxylic ester, and therefore the reaction has higher economical efficiency. The reaction has good universality, is suitablefor substrates with different substituents, and has high yield.

The invention discloses a metal spray cleaning agent which is composed of the following components including, by weight, 8% of sodium metabisulfite, 2% of ferrous sulfate, 3% of sodium tripolyphosphate, 2% of 3-methoxyl-3-methyl-butanol, 15% of an aluminum corrosion inhibitor, 10% of polyethylene glycol, 2% of cold-drawn polypropylene fiber, 2% of a silane coupling agent, 10% of polypropylene, 2%of a defoamer, 5% of diisocyanate, 4% of phosphorus-containing polyol, 5% of aluminum chloride, 2% of sodium nitrate, 1% of anhydrous borax, 1% of 2-hydroxyl-2-methyl-1-acetone, 5% of hexamethyl disilazane, 1% of polytetrafluoroethylene and the balance water. The cleaning agent can still maintain a low-foam or even non-foaming state when deburring is carried out at a spray pressure of 20 MPa to 15MPa at 20-40 DEG C, and the residual degree after cleaning is low.

The invention relates to the technical field of biomedical materials, in particular to a block copolymer, organic nano-particles and a preparation method and application of the block copolymer and the organic nano-particles. Preparation monomers of the block copolymer comprise a dopamine methacrylamide monomer and a sulfobetaine methacrylate monomer in a molar ratio of 1: (0.25-4). The organic nanoparticles formed by the block copolymer have low cytotoxicity, excellent biocompatibility, lubricating ability, anti-inflammatory efficacy and anti-aging effect.

A composition for removing mercaptan from a gas stream containing at least one acid gas in addition to a mercaptan, the composition comprising a physical and/or chemical solvent for H₂S and an inclusion compound for the mercaptan. A process of treating gas stream using the composition. The inclusion compound is selected from the group consisting of, cyclodextrin, cryptand, calixarene, cucurbituril. The chemical solvent may be monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA, diisopropylamine (DIPA), diglycolamine (DGA) and methyldiethanolamine (MDEA). Examples of useful physical solvents include cyclotetramethylene sulfone (sulfolane) and its derivatives, aliphatic acid amides, NMP (n-methylpyrrolidone), N-alkylated pyrrolidones and corresponding piperidone, methanol and mixtures of dialkethers of polyethylene glycols. The method copirses scrubbing preferably the natural gas with an aqueous solution comprising the above compounds followed by a stripping regeneration step.

The invention belongs to the technical field of optical adhesives, and particularly relates to a hot-melt optical adhesive with an ultraviolet blocking function and a preparation method thereof, and the hot-melt optical adhesive comprises the following components in parts by weight: 100 parts of a mixed copolymer; 1-5 parts of a coupling agent; 0.2-0.6 part of an antioxidant; 0.1-0.6 part of a light stabilizer; 5-10 parts of a water blocking agent; the mixed copolymer is obtained by reacting an ethylene-vinyl acetate copolymer, a cross-linking agent, an anti-ultraviolet agent, an initiator and a polymerization initiator in a weight part ratio of 100: (5-10): (0.5-1): (1-3): (0.5-1); the anti-ultraviolet agent is composed of 4-methacrylamido salicylic acid and thiazolyl-2 (1H)-pyridone-4-methallyl formate, and the thiazolyl-2 (1H)-pyridone-4-methallyl formate is obtained in the mode that citric acid and 2-aminoethanethiol are subjected to a reaction to obtain an intermediate product, and then the intermediate product is subjected to methallyl alcohol esterification to obtain the thiazolyl-2 (1H)-pyridone-4-methallyl formate. According to the optical adhesive, the optical adhesive has a shielding effect on ultraviolet rays with the wavelength of 320-400 nm in sunlight, so that the damage of most ultraviolet rays to the optical cement is reduced, and the service life of the optical cement is prolonged.

A polymer mixture includes 10 to 90 wt. % of polymer 1 and 10 to 90 wt. % of polymer 2, the total being 100 wt. %. Polymer 1 is polymerized from (a1) 70-95 wt. % of C₁-C₁₂ alkylester of (meth)acrylic acid, and (b1) 5-30% wt. % of C₂-C₈ alkyl ester of (meth)acrylic acid with a quaternary cationic group in the alkyl group. Polymer 2 is polymerized from (a2) 70-95 wt. % of C₁-C₁₂ alkylester of (meth)acrylic acid, and (c2) 5-30 wt. % of C₂-C₆ hydroxy-alkylester of (meth)acrylic acid. Monomers (a1) and (b1) add up to 98-100 wt. %, and most preferred to 100 wt. %. Monomers (a2) and (c2) add up to 98-100 wt. %, most preferred to 100 wt %.