30results about How to "Inhibition of self-aggregation" patented technology

The invention belongs to the technical field of transition metal chalcogenide-carbon materials, and particularly discloses a molybdenum selenide/graphene/carbon nanotube composite material and a preparation method thereof. The method comprises the preparation processes of: quenching a graphene oxide-acidified carbon nanotube aqueous dispersion by liquid nitrogen and carrying out freeze drying to prepare graphene oxide/acidified carbon nanotube aerogel; preparing graphene/carbon nanotube aerogel through a high-temperature carbonization method; and then carrying out in-situ growth of a vertically oriented molybdenum selenide nanosheet on the graphene/carbon nanotube aerogel through a one-step solvothermal method. The prepared graphene/carbon nanotube aerogel has the advantages of stable chemical property, high specific surface area, good conductivity, excellent mechanical property and the like; the molybdenum selenide nanosheet evenly grows on the graphene/carbon nanotube aerogel; a unique three-dimensional porous structure and high specific surface area of the graphene/carbon nanotube aerogel are fully utilized; and the composite material disclosed by the invention can be taken as an ideal high-performance electrocatalytic material and an electrode material for new energy devices of a lithium-ion battery, a solar battery and the like.

The invention discloses a terpolymer containing polyester chain links and polycarbonate chain links and a synthetic method thereof. The synthetic method comprises the following steps: mixing zinc-cobalt double metal cyanide complex catalyst, cyclohexene oxide and dicarboxylic anhydride in a solvent, introducing CO2 under the temperature of 30 to 150 DEG C till the pressure of CO2 is 0.5 to 10.0MPa, carrying out copolyreaction for 0.5 to 48 hours so as to obtain a crude product, and preparing the terpolymer which contains polyester chain links and polycarbonate chain links and has excellent thermal property and easy decomposition after purification. The molar percentage content of the polyester chain links, the polycarbonate chain links and polyether chain links of the terpolymer containing polyester chain links and polycarbonate chain links in the main chain are respectively 5 to 70 percent, 23 to 90 percent and 0.5 to 7 percent.

The invention aims at providing a preparation method of a graphene/polystyrene conductive composite material. The preparation method of the graphene/polystyrene conductive composite material comprises the following steps: (1) preparing graphene oxide (GO) powder; 2 dispersing and polymerizing to prepare cationic polystyrene (PS<+>) microspheres; and 3 preparing a GNS/PS composite material. The preparation method is capable of inhibiting auto-agglutination and induction of GNs and graphene is selectively distributed on a polymer particle surface to form a complete graphene three-dimensional network skeleton. A channel of free electron conduction is formed by a three-dimensional structure of which GNs is relatively ordered. The GNs/PS composite material shows relatively low conductivity thresholds and relatively high electric conductivity; the thermal stability of PS is improved by addition of the graphene; and the PS decomposition temperature is improved by 13.5 DEG C. A new idea is provided for construction of an ordered inorganic filler micro-structure employing a high-viscosity polymer system by a simple and convenient method; and further expansion of the application field of a graphene-based conductive composite material is facilitated.

The invention discloses a triphenylamine-based branch ligand substituted silicon phthalocyanine, a preparation method and an application thereof. 4-bromotriphenylamine and 4-hydroxy phenylboronic acidare catalytically coupled through tetrakis (triphenylphosphine) palladium, so as to acquire a branch precursor 4'-(diphenyl amino)-[1,1'-biphenyl]-4-alcohol; the 4'-(diphenyl amino)-[1,1'-biphenyl]-4-alcohol (TPA-OH) reacts with SiPcCl2 in the presence of methylbenzene and K2CO3, so as to acquire bi-(4-(diphenyl amino)-1-biphenylyloxy) axially substituted silicon phthalocyanine; steric hindranceof a triphenylamine substituted branch structure is capable of restraining the gathering of phthalocyanine to some extent; the triphenylamine with an aggregation-induced emission characteristic is introduced into the branch structure, so that the 'aggregation-induced quenching' effect of phthalocyanine is improved, the optical physical property of phthalocyanine is regulated and the simultaneous execution of fluorescence imaging and photodynamic therapy is realized; the triphenylamine-based branch ligand substituted silicon phthalocyanine can be used as a fluorescence imaging agent and a photodynamic therapy photosensitizer.

The invention discloses a purification rectifying tower and purification method for 3-methyl-3-butene-1-alcohol. The purification rectifying tower comprises a rectifying tower body, wherein a raw material inlet is formed in the middle part of the rectifying tower body; a solvent inlet is formed in a position, near the tower top, on the rectifying tower body; a solvent heater is connected onto thesolvent inlet through a pipeline; a tower bottom pipeline is arranged at the tower bottom of the rectifying tower body; a kettle liquid pump is connected onto the tower bottom pipeline; a gas phase inlet is formed in the bottom of the rectifying tower body; a tower bottom heater is also connected onto the tower bottom pipeline of the rectifying tower body; one end of the tower bottom heater is connected with the tower bottom pipeline; the other end of the tower bottom heater is connected with the gas phase inlet. The purification tower adopting the scheme is simple in structure. The purification method has the advantages that the inhibition on the self aggregation of the 3-methyl-3-butene-1-alcohol is facilitated; the decomposition loss of solvent is favorably reduced during the long-period production; the mutual solubility of a separation system and the solvent is favorably enhanced; the separation efficiency of gradual operation is improved; the yield of the 3-methyl-3-butene-1-alcohol can reach 99.99 percent.

The invention provides a system, method and reaction device for a process for preparing trifluoroethane through continuous reaction. The reaction device comprises an immersed pump and a deflector which are combined for use, the deflector comprises two baffle plate groups, and each baffle plate group comprises a plurality of baffle plates; the two baffle plate groups are respectively fixed on two opposite side walls, and two adjacent baffle plates are staggered, so that on one hand, the immersed pump is arranged in the reaction cavity, a liquid inlet pipeline can be directly connected into the immersed pump, additional pipeline arrangement is not needed, and the problem that an external pump cannot maintain the sufficient pressureduring high-pressure reaction is solved. The reaction safety coefficient is improved, the baffle plates are arranged at a gas leading-out channel of the reactor so as to integrate the gas-liquid separation, the equipment integration can be suitable for the high pressure reaction, and the reaction device of the present invention is especially suitable for the preparation of 1,1,1-trifluoroethane (HFC-143a).

The invention discloses a toughening agent composition, which comprises, by weight, 0.2%-10.0% of a styrene monomer, 0.5%-10.0% of a glycidyl methacrylate monomer and/or glycidyl methacrylate derivative monomer, 49.5%-94.0% of an ethylene-octene copolymer, 5.0%-49.5% of polyethylene and/or polypropylene and 0.2%-10.0% of talcum powder. By adding the talcum powder, the grafting rate of the epoxidized ethylene-octene copolymer, the epoxidized polyethylene and/or the epoxidized polypropylene in the toughening agent composition is guaranteed while the cross-linking degree is reduced; and the melting point of the initiator is further optimized, so that the cross-linking degree is further reduced.

The invention provides a preparation method of a vitamin A intermediate pseudoionone. The method relates to a reaction for preparing pseudoionone by catalyzing condensation of acetone and citral by using a novel catalyst, the use amount of reaction acetone can be effectively reduced by using the novel catalyst, self-polymerization and copolymerization of citral and pseudoionone in the reaction arereduced, and the reaction selectivity and yield are improved.

The invention relates to a method for preparing a highly grafted silanization modified clay/rubber nanocomposite material. According to the method, a silane coupling agent is treated with an acid to make a surface have more active silicon hydroxyl groups, and then is added to a clay slurry, the acid in the system can simultaneously activate the surface of clay to produce reactive hydroxyl groups,and a grafting reaction is completed in an aqueous phase; and a aqueous suspension of silane coupling agent-grafted clay is stirred and mixed with rubber latex, and the clay/rubber nanocomposite material is obtained by flocculation, washing, drying, mixing and a vulcanization process. By increasing hydrolysis of the silane coupling agent and increasing the amount of reactive hydroxyl groups on thesurface of the clay, the method enables the grafting amount of the silane coupling agent to be increased, thereby enhancing interaction between the clay and rubber, and mechanical properties of the rubber is increased.

The invention discloses a waterproof material used for a traffic signs housing. The waterproof material comprises the following components in parts by weight: 20-30 parts of a nitrile silicone rubber, 40-60 parts of composite alkene, 20-30 parts of a styrene butadiene rubber, 1-2 parts of vinyltrimethoxy silane, 85-95 parts of a filling strengthening agent, 0.1-0.4 parts of sodium dichromate, 4-8 parts of dicumyl peroxide, 3-5 parts of a plasticizer, 2-4 parts of tricresyl phosphate(hexadecenol)ester, 2-4 parts of liquid coumarone resin, 1-2 parts of tridecyl phosphate, 1.5-2.5 parts of an ultraviolet light absorbent UV-531, and 2-4 parts of acetylacetone titanium. The material has the advantages of good toughness and hardness, good sealing performance, excellent cold resistance and water resistance, and good aging resistance under extreme environment.

The invention provides application of an alpha-pyrone derivative namely 6-(3-hydroxypentyl-1-alkenyl)-2H-pyran-2-ketone to treatment of psoriasis and a pharmaceutical composition comprising the same compound and further provides a chemical preparation method of 6-(3-hydroxypentyl-1-alkenyl)-2H-pyran-2-ketone. The preparation method is simple in operation, high in product yield and low in cost, large-scale production can be realized, and problems of step complexity, low product yield and difficulty in mass preparation in application of an existing biological preparation method are solved.