34results about How to "Slow down aggregation" patented technology

The present disclosure provides a silicon based composite material, and a preparation method and a use thereof. The silicon based composite material comprises silicon nano-particles and polyaniline coating layers on surfaces of the silicon nano-particles, and Si—C covalent bonds are formed between the silicon nano-particles and the polyaniline coating layers. The silicon based composite material provided by the present disclosure is advantageous in improving the coating effect of polyaniline on silicon particles.

The invention relates to a single-sheet non-skinning oil ink which aims at realizing slow drying on a machine and fast drying on paper. The oil ink comprises the following components by weight percent: 10-25% of pigments, 0.1-5% of extender pigment, 20-30% of vegetable oil, 15-30% of mineral oil, 25-35% of resin, 0.5-3% of assistants, 0.5-2% of wax powder and 0.3-1% of gelatinizing agent, whereinthe pigments are the pigments with various colors which are red, yellow, blue and black generally; the extender pigment is any one of bentonite and calcium carbonate or the mixture of the two with anyproportion; the vegetable oil is bleaching sesame oil; the mineral oil is high-boiling point kerosene; the resin is the mixture of rosin modified phenolic resin and alkyd resin; the assistants are antioxidant and drying oil; the wax powder is polyethylene micro-powder wax; and the gelatinizing agent is liquid aluminum AO-3. The oil ink is prepared by adopting the production technology of the conventional offset printing oil ink.

The invention discloses an organic solar cell with vertical separation between a donor and a receptor and a preparation method thereof. The organic solar cell comprises a substrate, an anode, a hole transport layer, a photoactive layer, an electron transport layer and a cathode from bottom to top in sequence. The donor or the receptor in the photoactive layer of the organic solar cell is made of an organic material with polymerizable groups, when ultraviolet light triggers the photopolymerization of the polymerizable groups, the concentration of donor gradually decreases from one side of the cathode to the anode, in addition, the concentration of the donor gradually decreases from one side of the anode to the cathode, so that the vertical separation between the donor and the receptor is realized, not only is the formation of double continuous channels facilitated to guarantee the transmission of carriers, but also a built-in electric field with direction can be produced to facilitate the exertion of the electron hole pair, short-circuit current is increased, and thus, the photoelectric conversion efficiency of battery is improved.

The invention discloses a preparation method of the poly-dicyclopentadiene/montmorillonite nanocomposites. The support catalysts is prepared through the complex compound compounded by the compound with hydroxide radical and the tungsten hexachloride attaching to the organic montmorillonite, and the complex compound comprises the paratert-butyl phenol, quadruple ((Beta-(3, 5-tert-butyl -4- hydroxy phenyl) monoprop) pentaerythritol ester or 2-hydroxy-4-n-octyloxybenzophenone, etc. The polymerization of the dicyclopentadiene is catalysed through the in situ polymerization model by the catalyst, the interlayer spacing is increased when the dicyclopentadiene monomer polymerizing in the interlayer of the montmorillonite, the interlayer of the montmorillonite is peeled by the heat produced in the reaction, the peeled interlayer of the montmorillonite is scattered in the poly-dicyclopentadiene, and the poly-dicyclopentadiene/montmorillonite Nanocomposites is produced, and then a model is prepared by the reaction injection molding method. The composites are showed with nanocomposites structure through the X-ray diffractogram.

The main goal of the present invention is the development of a polymerizable material for isolation and protection of the gums and generally the soft tissues of the oral cavity. For better protection during various procedures of the dental surfaces. The composition of the material can contain many other substances that strengthen its qualities and protective action. Such substances can be various substances that have antioxidative, sedative, anti-inflammatory, analgesic, anti-irritant action etc.

The invention discloses color toner which comprises the following components in parts by weight: 60-80 parts of styrene, 15-25 parts of butyl acrylate, 3-7 parts of composite wax, 3-6 parts of pigment, 0.2-1.5 parts of charge regulator, 1-2 parts of ammonium persulfate, 0.1-2 parts of molecular weight regulator, 1.0-3.0 parts of surfactant and 1-4 parts of silicon dioxide, wherein the composite wax comprises two or more of carnauba wax, polypropylene wax or C80 paraffin. According to the invention, the composite wax is added in the emulsion preparation stage, so that the polymerization speed can be properly reduced in comparison with the use of single wax, thus improving the toughness and printing durability; the use of the composite wax can lower the cost and ensure that the prepared color toner has better emulsibility, better gloss, better hardness and better stability; and the color toner is narrow in particle size distribution and has an average particle size D50 of 5-8 mu m, so that the particle size is easy to control.

The invention provides a butyl rubber production process, which comprises: S1) mixing monoolefine, diene, a nitrogen-containing organic compound and a reaction solvent to obtain a reactant solution; wherein a nitrogen-containing organic compound is selected from alkylamine and/or aromatic amine; mixing a main catalyst, a cocatalyst and a reaction solvent to obtain a catalytic system; wherein the main catalyst is Lewis acid; S2) aging the catalytic system at a low temperature, then mixing the aged catalytic system with a reactant solution, and carrying out a reaction to obtain product slurry; and S3) adding an alcohol compound into the product slurry to terminate the reaction, thereby obtaining the butyl rubber. Compared with the prior art, according to the invention, the nitrogen-containing organic compound is introduced as a slurry stabilizer in the polymerization process; due to the existence of a substance, the cationic active polymerization speed can be effectively reduced, the dispersion state of a product in a polymerization system is improved, the product is uniformly dispersed, the mass transfer and heat transfer of the polymerization system are effectively enhanced, the product quality is stable, the molecular weight distribution is widened, and the processability is excellent.

The invention discloses a preparation method of high-solid-content cationic polyacrylamide emulsion. The preparation method disclosed by the invention adopts a segmented initiation process, a 1 to 5 percent low-concentration reducing agent solution is slowly dropwise added in a redox stage to reduce the polymerization rate in the redox stage, the polymerization time is prolonged, and the problemsthat the synthesis of low-molecular-weight polyacrylamide emulsion cannot be initiated at a low temperature and requirements on the heat dissipation capability of equipment are high are solved. According to the preparation, the maximum temperature of the polymerization is controlled within a safe range by slowly dropwise adding the low-concentration reducing agent solution, so that a plenty of time is provided for dissipating the polymerization heat; furthermore, the conversion rate in the redox stage is increased, and the potential safety hazard in an azo initiation stage is eliminated. The low-molecular-weight high-solid-content cationic polyacrylamide emulsion product prepared by the preparation method can be widely applied to various sewage and sludge treatment fields.

The invention discloses a method for extracting butadiene from dimethylfomamide and a mixture thereof. The dimethylfomamide and the mixture thereof consist of dimethylfomamide and a low-boiling-point solvent, wherein the content of the dimethylfomamide is 50-99 percent by weight; the low-boiling-point solvent is a solvent of which the boiling point is lower than that of the dimethylfomamide and is 50-153 DEG C, and is preferably one or more of acetonitrile, butanone and acetone; and the dimethylfomamide and the mixture thereof are taken as extracting agents of butadiene in the method. The method comprises a first extractive distillation step, a second extractive distillation step, a refining step and the like. Due to the adoption of the method disclosed by the invention, the selectivity of the solvent can be increased, the tower plate number and the solvent ratio of an extractive distillation tower can be greatly lowered, and the equipment investment and the operating cost are lowered.

The invention discloses a casting method and device for super characters. The casting method for the super characters comprises the following steps: placing a character die onto a casting flat plate,injecting resin used for character casting into the character die, spraying cold water or hot water towards the casting flat plate from the below, and performing temperature control on a polymerizingand curing process of the resin through the casting flat plate. Casting time for super characters can be shorted to 20 minutes, and all processes of casting, ageing and de-moulding are accomplished inthe casting device, so that the problems in existing two processes are solved very well. The casting process can perform heating and cooling with highest speed, so that the whole casting process is guaranteed to stably and efficiently accomplish, a qualification rate of products can be remarkably increased, and stable product quality is guaranteed.

According to a preparation method of graphene modified phenolic resin for precoated sand, graphene, a composite modifier, and modified coupling agent are used for modifying the phenolic resin, so thatthe strength and the toughness of the phenolic resin can be obviously improved, and the graphene modified phenolic resin is suitable for manufacturing the precoated sand with high strength and high toughness; meanwhile, dialdehyde is added in the production process of the phenolic resin, the bifunctional aldehyde compound can react with phenol to form a macromolecular grid structure, phenolic resin molecules with high molecular weight are obtained, the content of phenol can be effectively reduced, and environmental pollution is reduced. By adding the composite modifier, the fluidity is improved, the polymerization speed is greatly reduced, the curing time of the phenolic resin is prolonged, the heat-resisting time can be greatly prolonged, and the collapsibility and the normal-temperaturetensile strength are improved; and the silane coupling agent can be better dispersed in the phenolic resin through the modified coupling agent, and the crosslinking condition of the silane coupling agent is effectively improved.