975results about How to "Solving Dispersion Problems" patented technology

The invention discloses a parallel structure and a control method for a photovoltaic power generation grid-connected inverter and belongs to the technical field of renewable energy sources. A topological circuit structure of the photovoltaic power generation grid-connected inverter is divided into a parallel structure of single-phase voltage type pulse-width modulation (PWM) inverters and a parallel structure of three-phase voltage type PWM inverters; and in the control method, an outer ring regulator of a control circuit of the parallel voltage type PWM inverters is independent based on a power grid voltage-oriented vector control technology in a control mode of voltage outer ring and current inner ring so as to form a common unified outer ring regulator; control strategies of various inverters are simplified into single closed loop current control so as to achieve the consistency of energy flow directions of the parallel voltage type PWM inverters and avoid ring current; and the parallel current sharing of the voltage type PWM inverters is realized. Therefore, multiple modules of the voltage type PWM inverters are connected in parallel to realize high-power modularized large-scale application.

The invention discloses a polymer/graphene anti-static coating, a preparation method and application thereof. The coating comprises the following constituents by weight percent: 0.01 portions to 0.5 portions of graphene; 0 portion to 10 portions of conductive additive; 90 portions to 100 portions of polymer; and solvent; the preparation method thereof comprises the following steps: completely and uniformly mixing graphene and conductive additive in advance by various manners; preparing a graphene-conductive additive compound system; using the compound system as a base, adding in conductive additive and polymer along with the solvent, completely and uniformly mixing to obtain the coating. Additionally, an anti-static film can be prepared by using different film forming technologies. The polymer/graphene anti-static coating, the preparation method and application thereof effectively solve the problems that graphene in polymer is easy to agglomerate and difficult to be uniformly dispersed in the preparation process of anti-static coating and film; the anti-static performance and mechanical performance of the coating and the film are greatly increased; meanwhile, the preparation technology is easy to be operated; the production is continuous, and the coating and film are suitable for industrial production.

The invention discloses a graphene/carbon black thermoplastic resin master batch with high dispersibility and a preparation method thereof. The graphene/carbon black compound in the master batch is formed in an electrostatic self-assembly manner, and comprises 10-50% of graphene, 5-20% of carbon black, 0.5-10% of surfactant, 10-65% of carrier resin and 2-10% of assistant. The preparation method comprises the following steps: (1) compounding and dispersing graphene by adopting the surfactant to control the positive electricity of the graphene surface; (2) forming a stable graphene/carbon black compound from the modified graphene and carbon black with positive electricity through electrostatic incorporation in a self-assembly manner; (3) preparing the graphene/carbon black thermoplastic resin master batch with high dispersibility by matching with a solution blended process, a melt-blending method and an in-situ polymerization method; (4) adding the assistant to extrude and pelletize, so as to prepare the graphene/carbon black/thermoplastic resin master batch particles after processing the master batch. By adopting the obtained master batch, the problems of difficult charging of graphene powder, uneven dispersion, dust pollution, unstable product performance and the like are solved.

A preparation method of a grapheme and ferriferrous oxide composite nanometer material belongs to the technical field of functional materials. The preparation method comprises the following steps: at first, oxidized grapheme is prepared by an improved chemical method; and then oxidized grapheme and ferric ions are adopted as raw materials, and are compounded through adopting a solvothermal technology to carry out one-step in-situ reduction to obtain the grapheme and ferriferrous oxide composite nanometer material. The preparation method solves the problems in the prior art that the interface binding force of grapheme and a magnetic material is insufficient, the appearances, the sizes and the magnetism of magnetic material particles are uncontrollable, and the magnetic material particles cannot be dispersed in water; the prepared composite nanometer material shows a microspheric appearance, has a loose surface and is high in specific surface area; through the change of the ratio of grapheme to the ferric ions, final magnetic property and electrical property of the composite material can be adjusted; and the controllable growth of the grapheme and ferriferrous oxide composite material is realized. The prepared grapheme and ferriferrous oxide nanometer microsheric material with magnetic and electric properties can be used in fields such as biological medicine, energy, invisibility and electronic materials.

The invention discloses a vehicle loss determination method based on mobile communication terminal or network terminal, comprising the steps that: after a traffic accident, a party transmits an image of the damaged part and related information of a vehicle to a loss determination service center by wireless communication network; the loss determination center analyzes the image of the damaged part and related information of the vehicle, determinates the loss by a loss determination system; and the loss determination service center submits the loss determination result to the party by wireless commutation network. The party transmits the image of the damaged part and related information of the vehicle to the loss determination service center by wireless communication network, the loss determination service center determinates the loss by the loss determination system, and submits the result to the party by wireless communication network, therefore the invention is capable of assuring instantaneity, reasonability and precision of loss determination.

A composite fibre based on carbon nanotubes is prepared through modifying the surface of carbon nanotube, polymerizing them with polymer monomer, trigger and assistant to obtain dope, and spinning. It has 3-20 CN/dtex break strength and 10 to the power (2-8) ohm.cm resistivity.

The invention relates to a controllable oxidative-biological degradation plastic master batch, comprising an inorganic filling material, a carrier, an oxidative degradation promoter, a biodegradation promoter and a degradation control agent, wherein the degradation control agent is an anti-oxidant. According to the plastic master batch provided by the invention, a bivariate control system of oxidative degradation and biodegradation can be optimized and linked according to an actual environment so as to allow the plastic master batch to have environment targeting performance and degradation controllability. A preparation method for the plastic master batch is simple, is easy and convenient to operate, improves mixing and dispersing capability of the plastic master batch and provides an effective solution to overcome the problems of organic-inorganic interfacial compatibility and uniform dispersibility.

The invention discloses a flame-retardant monomer containing DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) groups, and a preparation method and an application of the flame-retardant monomer, and relates to a compound. The method comprises the steps of sequentially adding an organic solvent, carbon tetrachloride and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide into a reaction flask, putting in an ice water bath, adding hydroxyethyl methylacrylate and an acid-binding agent while stirring, after temperature rise reaction, decompressing, and performing suction filtration to remove acid-binding agent salt, purifying a crude product through spin steaming, washing and dryness, and obtaining a product, namely the flame-retardant monomer containing the DOPO groups. The flame-retardant monomer containing the DOPO groups can be applied in preparing a flame-retardant high molecular material. A reaction condition is mild, the productivity is high, the product purification and separation are simple, and the extended production is easy. The monomer is introduced into a polymer matrix such as polystyrene and polymethyl methacrylate by a free radical copolymerization manner, an intrinsic flame-retardant polymer material is prepared, and the defects of poor compatibility of an additive flame retardant and the matrix, high loss possibility during use, poor water resistance and the like are overcome.

The invention discloses a process and equipment for preparing a nanoparticle-reinforced metal matrix composite material. The process comprises the following steps of: mixing reinforcing nanoparticles with matrix metals and a grain growth inhibitor in a stirring ball mill together, and then loading the mixture into a steel pipe; casting the mixture together with the matrix metals in a water cooling crystallizer or casting and forming the mixture together with a molten metal in a casting mould; and performing quick solidification and crystallization after electromagnetic stirring and ultrasonic vibration to ensure that the two phase materials achieve complete metallurgical bonding, wherein because of the electromagnetic stirring and the ultrasonic vibration, the two phase materials are mixed more uniformly, and all properties of the composite material can be further improved. by using the process and the equipment, a production process is simple, the cost is low, the efficiency is high, the product performance is high, the process is easy to control, the external dimensions of products are not limited by the process, and large-sized nanoparticle-reinforced metal matrix composite materials can be manufactured.

The present invention involves the field of anticorrosive coatings, which provides a graphene -based high -solid high -solid -based epoxy anticorrosive coating and its production method to solve the poor anticorrosive coating performance of existing technologies, not environmental protection, and graphene difficult to stabilize the stability in the coatings.The problem is composed of the main paint and curing agent mixed. The main paint consists of the following weights of the following weights: epoxy resin 18‑25 weight, dilute agent 10‑15 weight, auxiliary 0.2‑3 weight portion, Graphene 0.1量2 weight, pigment 10‑15 weight, filler 35‑45 weight, tactile 0.5‑5 weight; the curing agent consists of the following weights of each raw material: amine resin 75‑‑‑85 weights, dilute agents 5‑15 weights, and additives 3‑8 weights.

The invention relates to a preparation method for a polyimide/oxidized graphene nanocomposite film, and belongs to the technical field of preparation of functional polymer materials. The preparation method comprises the following steps: performing ultrasonic even dispersion on the oxidized graphene in an organic solvent to obtain an oxidized graphene sheet suspension, wherein per ml of the oxidized graphene sheet suspension contains 1.3*10<-5>-1.3*10<-4>g oxidized graphene sheets; introducing nitrogen for carrying out deoxidization protection, adding diamine monomers into the suspension, mechanically stirring until full dissolution is achieved, adding dianhydride monomers, the moles of which are equal to that of the diamine monomers, in batches, and mixing for one to six hours under the ice bath conditions, so as to obtain polyamide acid/oxidized graphene composite solution; pouring the polyamide acid/oxidized graphene composite solution onto a die, removing the organic solvent, performing gradient temperature rise within 100-300DEG C, and carrying out thermal imidization to obtain the polyimide/oxidized graphene nanocomposite film.

The invention discloses a method to produce nanometer graphite sol. It supplies a system which includes highly pure graphite as anode, inert materials as cathode and electrolytical aqueous solution. There is an impulsing power source to connect the anode and cathode. The pulse period of the power source is 0.05-0.5 second, effective voltage 2-10V (3-5V is prelatered) and effective amphere density 15-75A (25-35 is prelatered). The efficiency of this invention is higher than common direct-current electrode method. The produced nanometer graphite sol is stable and disperses so it can produce nanometer graphite powder whose diameter is under 15nm.

The invention provides a graphene anticorrosive coating and a preparation method thereof. The graphene anticorrosive coating is prepared from a component A and a component B, wherein in percentage by weight, the component A comprises 20%-30% of epoxy resin, 1%-3% of graphene, 0.5%-2% of a dispersing agent, 15%-25% of talcum powder, 10%-20% of zinc powder and 1%-5% of aluminum paste, and the component B comprises 30%-50% of cashew nut shell oil phenolic amide and 10%-30% of polyamide. The graphene anticorrosive coating provided by the invention is safe and environment-friendly, is moderate in cost, simple and convenient in process, stable in storage, excellent in adhesive force on base materials such as steel, iron and the like, excellent in mechanical performance such as flexibility, wear resistance performance and the like, and prominent in protective effects in chemical media such as an acid, an alkali, a salt and the like, shows excellent protective performance such as high and low temperature resistance, high salinity resistance and the like in a condition of a simulation marine environment experiment, and can be applied as primer for an anticorrosive coating in ocean engineering with various steel and iron materials.

The invention discloses a nm titanium dioxide inorganic surface treating method. The inorganic surface treating is performed when the nm titanium dioxide is in good dispersed state and the inorganic surface treatment effect is increased using the said method. The invention solves the flocculation and dispersion problem of nm titanium dioxide using ultrasonic field, mechanical agitation and film separation and phase integrating. During the process of treating the inorganic surface, on the one hand the nm titanium dioxide dispersion liquid is always under the action of mechanical agitation and ultrasonic, on the other hand, the impurity ions are continuously removed using membrane separation device, so as to make sure the inorganic surface coating reaction under the full dispersed state of the nm titanium dioxide.

The invention discloses a preparation method for a polyimide/graphene nanocomposite material. The method is characterized by: adopting graphite as a raw material; adopting a modified Hummers method for synthesis of a graphene oxide; adopting an organic molecule containing isocyanic acid radical to modify the graphene oxide; uniformly dispersing the surface modified graphene oxide in an organic solvent system, adding equivalent dianhydride monomer and equivalent diamine monomer at a temperature of 0-25 DEG C after uniformly dispersing; continuously carrying out the reaction for 6-24 hours, followed by carrying out heat treatment for the resulting solution to prepare the high-performance polyimide/graphene nanocomposite material. With the prepared polyimide/graphene nanocomposite material through an in situ polymerization method, dispersing problems and compatibility problems of the graphene in the polyimide matrix are solved, the polyimide nanocomposite material with good dispersity isobtained. In addition, the prepared material provided by the present invention has potential application values in the fields of heat resistant materials, structural materials, conductive materials, adhesives, and the like.

The invention relates to a manufactured sand underwater dispersion resistant concrete, which comprises the following components in parts by weight: 100 parts of cement, 1-5 parts of underwater dispersion resistant additive, 2-20 parts of silica fume, 1-20 parts of coal ash, 1-10 parts of an enhancer, 140-200 parts of manufactured sand, 140-200 parts of macadam, and 30-50 parts of water. The preparation method comprises the following steps of firstly putting the manufactured sand, the macadam aggregate, the cement, the enhancer, the coal ash and the silica fume into an agitator, blending through dry mixing, then adding the underwater dispersion resistant additive to further blend through dry mixing, adding water into the material blended through dry mixing previously, stirring for 5-8 minutes, then preparing the manufactured sand underwater dispersion resistant concrete. The manufactured sand underwater dispersion resistant concrete has strong construction mobility, so that the problem of contradiction of mobility and dispersion resistance of the underwater dispersion resistant concrete is better solved, and therefore, the manufactured sand underwater dispersion resistant concrete not only has good dispersion resistance, but also has self-leveling and self-compaction construction mobility.

The invention relates to a low-compressive-deformation and high-conductivity rubber composite material and a preparation method thereof. The low-compressive-deformation and high-conductivity rubber composite material is prepared by the following steps of: taking silicon rubber as a base body and utilizing modified grain-shaped and fiber-shaped metal-plating conductive fillers containing a reactive double-bond silane coupling agent under a CO2 supercritical state to prepare low-compressive-deformation and high-conductivity rubber composite material. Under the condition of guaranteeing the high conductivity, the use amount of the conductive fillers is reduced and the composite material has low compressive deformation and high conductive property.

The invention provides pitch modified from waste tire rubber powder and a preparation method thereof. The preparation method comprises the following steps of: heating 2-14 parts by weight of heavy fraction oil to 90-130 DEG C; adding 84-97.8 parts by weight of waste tire rubber powder and 0.2-2 parts by weight of additives to evenly mix; radiating the mixture by a microwave for 3-10 min; adding 60-85 parts by weight of pitch to 15-40 parts by weight of modified waste tire rubber powder at 160-200 DEG C to mix evenly; and shearing the mixture at a high speed to obtain a mixture, i.e. the modified pitch of the invention. By selecting waste tires as raw materials, the invention has simple and easily obtained raw material, cost saving, environmental protection and pitch performance improvement. The waste tire rubber powder is decarbolized under the microwave radiation to improve the storage stability of the modified pitch. Meanwhile, the waste tires are utilized. The invention has simple modified pitch preparation process and strong practicability.

The invention provides polyamide6-graphene quantum dot/carbon nanotube anti-static fiber and preparation. According to the method, the molecular template effect of graphene quantum dots is utilized for being compounded with a carbon nanotube to form a self-assembled three-dimensional network structure first and then combined with a PA6 knitting state structure to form a dislocation effect to construct a conductive path, conductivity is improved on the condition of not losing a mechanical property of PA6 fiber, and meanwhile conductivity and the mechanical property of the PA fiber are promoted. Moreover, by means of compounding of the graphene quantum dots and the carbon nano tube and the self-assembled three-dimensional network structure, electronic transmission efficiency in the carbon nano tube is improved, a small quantity of GQD/CNT is added, conductivity of the fiber can be improved, and transparency is improved at the same time, which is beneficial for treatment technologies like dyeing in the fiber preparing process. By means of the traditional mature PA6 melt spinning technology, the high-strength and high-conductivity PA6-GQD/CNT composite fiber with tensile strength being 0.52-0.81 GPa and line resistance being magnitude 106 is prepared and can be applied to anti-static clothes, needle-punched carpet, filter felt, industrial non-woven fabric, medical supplies and the like.

The invention relates to the technical field of medicine, which is a preparation of a taxane drug for intravenous drug delivery, consisting of two parts of drug solution and an emulsion. The drug solution is composed of paclitaxel or docetaxel, a pH regulator and a solvent for injection, wherein, the solvent for injection is an organic solvent; the emulsion comprises a fat emulsion and is composed of oil for injection, an emulsifier, an antioxidant, an isotonic regulator, a stabilizer, a pH regulator and water for injection. When in use, the drug solution can be added and evenly mixed in the emulsion for direct intravenous drip according to the clinical drug dosage and can also be firstly added in the emulsion with the volume that is not less than 5 times of the volume of the drug solution according to the clinical drug dosage and then added with a certain amount of physiological saline or glucose injection for intravenous drip. The preparation of the invention does not contain solubilizer and has the advantages of little toxicity, safety, effectivity, stability and economy. The fat emulsion can also be taken as a nutrition replenisher for a patient, thus achieving better treatment effects. The physiological saline or the glucose injection can also replace a certain amount of the emulsion, so the storage and the transportation are convenient, and the preparation is more economical.

The invention discloses an amylum category complete biodegradable material and a preparation method thereof. The amylum category complete biodegradable material comprises, by weight, the long-chain branch aliphatic polyester or long-chain branch aliphatic series- aromatic copolyesters 50-70%, the starch 20-30%, the chain extender 0.1-3% and the balance chain extender 9-17%. The preparation method comprises the steps of enabling all components to be mixed in a high speed mixer, feeding in a twin-screw extruder after accurate measurement by means of a measurement scale, and extruding and prilling by adjusting a built-up sequence of a screw and designing different exhaust ports. The amylum category complete biodegradable material and the preparation method of the amylum category complete biodegradable material solve the problems of dispersing, plasticizing and exhausting of starch filler in the twin-screw extruder, and obtained amylum complete biodegradation material not only has complete biodegradation performance, but also has excellent mechanical property and good extrusion molding working quality.

The invention discloses a cost index analysis method, comprising the following steps: S1, establishing an index analysis rule base; S2: obtaining basic information and the general characteristics of a case project by a project management module and introducing an XML document of the case project; S3: with an index analysis module, matching a newly-built index project with the index analysis rule base, carrying out calculation to obtain a cost index analysis result of the a newly-built index project, and displaying an index analysis result file; and S4, outputting the cost index analysis result by an output module. In addition, the invention also discloses a cost index analysis system. With the system and the method, the efficiency of analyzing an index by the cost staff can be improved and index data sharing can be realized.