84results about How to "Strong pollution resistance" patented technology

The invention relates to a method for preparing a polyether modified HMDI waterborne polyurethane curing agent. The curing agent is mainly prepared from hydrogenated diphenyl-methane-diisocyanate H6MDI or H12MDI, polyether polyol, inert solvent and polymerization inhibitor. The polyether modified HMDI waterborne polyurethane curing agent does not contain aromatic hydrocarbon, glycol ether or alkylphenol, has the characteristics of environmental friendliness, good scratch resistance, good transparence, excellent chemical resistance, strong pollution resistance, good yellowing resistance and the like; and polyurethane paint prepared from a waterborne hydroxyl component has the characteristics of high hardness, high transparence, good film scratch resistance, good leveling property, high fullness, good solubility and the like, can be widely applied to waterborne wood lacquer, waterborne industrial paint, waterborne plastic paint and other various dual-component waterborne polyester paint, waterborne polyurethane paint, waterborne epoxy paint, waterborne alkyd paint, waterborne polyurethane glue and other specific curing agents.

The invention relates to a charged membrane device for water processing. The device comprises a power supply, a membrane group device and a membrane assembly, wherein the membrane group device is groove-shaped, the upper portion and the lower portion of the membrane group device are open and the periphery of the membrane group device is sealed, the membrane assembly is arranged inside the membrane group device, and the outer surface of a hollow fiber membrane wire is coated with a layer of outer tubular supporting layer having a mesh multi-hole structure to form a hollow fiber membrane. When the device is applied in an immersion type membrane separation technology, under the action of current of the power supply, the hollow fiber membrane wire is shielded by the negative electrode of the outer tubular supporting layer, and pollutants with negative electricity can hardly pollute the hollow fiber membrane under the action of electrostatic repulsive force and the flocculation of an electrode dissolution flocculating agent, so that membrane pollution is controlled. The charged membrane device having an anti-pollution function and capable of generating the flocculating agent can control membrane pollution effectively and has the advantages of being high in stain resistance, high in strength of the membrane wire, free of addition of the flocculating agent, capable of purifying waterquality, practical and the like.

The invention discloses a preparation method of modified composite ultrafine talcum powder, which comprises the following steps: (1) breaking raw material, and grinding the broken material to fine powder; (2) adding water and grinding-assistant medicine into the ground material to be configured into pulp with the concentration of 50 to 70 percent and to be uniformly mixed; (3) configuring composite modifier, silane coupling agent and sodium stearate to surface modification solution to be poured into the pulped material so as to modify the material; (4) carrying out the wet-method ultra-fine grinding on the modified material, and requiring the particles with the granularity being less than 2 micrometers for the mineral pulp ultra-fine grinding to be more than 95 percent; (5) forcibly drying and collecting the material after being ultra-fine ground. By utilizing the wet-method ultra-fine grinding and mightiness drying process, the prepared modified composite ultra-fine talcum powder has smaller granularity than that of ordinary talcum powder and wider distribution, resists the insolation and high temperature, has good water resistance, resists pollution, and has strong anti-aging performance.

The invention discloses a membrane refining process for medicinal sodium chloride. The membrane refining process comprises the following steps: leading brine or crude salt water saturated by melting salt into a front reaction tank, adding barium chloride into the front reaction tank, filtering through a large-mesh filter after reaction, and removing sulfate radical through a first membrane filter; leading the sulfate radical-removed clear liquid into a rear reaction tank, adding sodium hydroxide and sodium carbonate into the rear reaction tank, and leading the solution into a second membrane filter after complete reaction so as to remove calcium and magnesium; leading the calcium and magnesium-removed clear liquid to an acid regulating tank, and adding hydrochloric acid to adjust the pH, so as to obtain refined salt water; producing the medicinal sodium chloride by an evaporation method, wherein the obtained medicinal sodium chloride has the advantages that the concentration of SS is less than or equal to 1mg/ L, the total concentration of Ca<2+> and Mg<2+> is less than or equal to 1 mg/L, and the concentration of SO4<2-> is less than or equal to 20 mg/L. According to the membrane refining process, a two-stage membrane filtration method is adopted, no flocculant is added, the process is continuous, the operation is simple, the treatment capacity is large, the pollution resistance is high, and the quality of the medicinal salt is obviously improved after evaporation and crystallization.

Disclosed is a preparation method of silicon separation membrane, having specific selectivity to natural products, which belongs to a membrane preparation technique. The method comprises: dissolving a template agent into an alcohol solution to produce template agent solution, then, adding functional monomers into said produced solution, adding in stabilizer, condensing and refluxing to remove the solvent and produce a silane precursor, dissolving tetraethoxysilane into the alcohol solution, adding in the silane precursor followed by condensing and refluxing to prepare a sol, next, aging at room temperature and dipping treated Al2O3 plate into the sol, finally, sintering in a muffle, eluting the template agent and drying to produce silicon separation membrane. The present invention is characterized in simple preparation, the produced separation membrane realizing selectively separation of a certain substance in molecular scale, water-phase molecule recognition, particularly fit for natural products separation and extensive general uses.

The invention provides an internal pressure type composite hollow fiber nanofiltration membrane filament, which comprises an inner layer of a hollow fiber membrane taking polyether sulfone as the mainbody. An amino functional group reacts with a catalyst to form an aromatic polyamide compact selection layer. The membrane filament has the advantages of stable performance, strong pollution resistance, chlorine resistance, and high flux and bivalent salt interception. And a hollow fiber membrane module composed by the hollow fiber nanofiltration membrane filament can realize a large filling area, which can be 2-3 times that of a roll type membrane module, so that the treatment capacity can be greatly improved.

The invention provides a sewage treatment method using A/O biological contact oxidation process belonging to environmental engineering technology field, which solves the problems that in the prior art the adaptability of water quality is not strong, the impact resistance perfermance is weak, the effluent water quality is unstable and sludge bulks or the like. The sewage treatment method using A/O biological contact oxidation process comprises the following steps: A. pretreatment; B. hydrolytic treatment; C. aeration treatment; D. deposition and disinfection, and has advantages of high volume loading, rapid rate of biodegradation and low cost.

The invention relates to the technical field of separation membrane preparation, in particular to a hollow fiber composite nanofiltration membrane and a preparation method thereof. The method comprises the following steps: preparing a hollow fiber ultrafiltration membrane by adopting a composite thermally induced phase separation method, and finally preparing the hollow fiber composite nanofiltration membrane by taking the prepared hollow fiber ultrafiltration membrane as a base membrane and adopting a chelating auxiliary surface coating method. The chelating auxiliary surface coating method used in the invention has the advantages of mild reaction, environmental friendliness and easiness in operation. According to the prepared hollow fiber composite nanofiltration membrane, the permeation flux of the membrane is close to 6 times that of a polyamide hollow fiber composite nanofiltration membrane formed by a traditional interfacial polymerization method on the premise that the retention rate of dye is basically unchanged, the application is expected to be applied to the field of printing and dyeing wastewater treatment, and a new generation of high-flux composite nanofiltration membranes is provided.

The invention relates to a cold rolling and rough rolling lubricating agent for a copper and copper alloy sheet strip. 32# oil for a total-loss system is used as base oil and is matched with various composite additives including an anti-wear agent, an oiliness agent, an anti-oxidant and anti-corrosive additive, a metal deactivator, an anti-foaming agent, a dispersing agent and the like. The lubricating agent has the characteristics of relatively high viscosity, thick and firm oil film, high allowable pressure, good cooling performance and flowability and strong pollution, emulsion and foam resistance so as to be suitable for being used under the working conditions of hard rolled pieces and high rolling pressure.

The invention relates to a modified nanofiltration membrane suitable for recycling industrial wastewater, and a production method and an application thereof. The method comprises the following steps: grafting polyethersulfone (PES) with polyethylene glycol methyl ether methacrylate (PEGMA) to obtain hydrophilic PES-g-PEGMA, blending the hydrophilic PES-g-PEGMA with polyvinyl butyral (PVB), and carrying out an immersion precipitation phase inversion technology to produce the PES-g-PEGMA/PVB blend nanofiltration membrane. The nanofiltration membrane produced in the invention has the advantages of simplicity in production, low cost, mild reaction process, strong hydrophilic property, large water flux, high retention rate and strong anti-pollution capability, and is suitable for reusing industrial wastewater reclaimed water in the printing and dyeing industry and the pharmaceutical industry.

The present invention belongs to the field of external wall coating technology, in the concrete, it relates to a semi-toughness fluorosilicone acrylic resin and its preparation method. It is made up by using (by wt%) 10%-45% of fluororesin, 15%-50% of elastic acrylic resin, 1%-8% of organic silicone. 2%-6% of diisocyanate and 20%-37% of solvent, through cross-linking reaction process.

The invention provides a forced overflow type graphene oil-containing sewage treatment device. A tank is a horizontal cylindrical sealed container, and a nitrogen inlet is arranged at the top of the tank; an oil-containing sewage inlet is connected with an oil-water separation chamber, and a water distribution tube A is arranged in the periphery of the upper part of the oil-water separation chamber; the left side of the oil-water separation chamber is an oil receiving chamber, and the right side of the oil-water separation chamber is a sewage chamber; a water permeation hole is arranged between the oil-water separation chamber and the sewage chamber; the right side of the sewage chamber is a water production chamber, and a water distribution tube B is arranged between the sewage chamber and the water production chamber; a graphene-based screen membrane is distributed below a water spray tube at the upper part of the water production chamber, and an oil receiving tank is arranged at the tail part of the graphene-based screen membrane; an oil receiving tube is arranged at the bottom of the oil receiving tank; and a water tube is arranged at the bottom of the water production chamber. The device has the advantages of high oil removal efficiency, small occupied area, high resistance to pollution, wide inlet water quality requirements, satisfactory adaption to the oilfield sewage conditions, and simple matched treatment process flow.

The invention provides a piezoelectric electro-hydraulic servo valve and a control method thereof. The pre-stage pressure of the servo valve is controlled through a piezoelectric driving scheme, so that the displacement and the output flow of a main valve element of the servo valve are controlled. The piezoelectric electro-hydraulic servo valve comprises a piezoelectric driving device, a controller, an LVDT displacement detection device, a fixed baffle, a throttler and a valve element; the LVDT displacement detection device acquires a valve element displacement signal and sends the valve element displacement signal to the controller; the controller receives an input signal of the servo valve and the valve element displacement signal and outputs a control signal; the piezoelectric driving device receives the control signal, controls the electro-hydraulic servo valve to generate a controllable pre-stage pressure, and generates an acting force for driving the valve element; and the fixedbaffle and the piezoelectric driving device form a variable throttling hole. According to the invention, by the piezoelectric driving scheme, a brand-new electro-hydraulic servo valve variable throttling scheme is formed; a complete control strategy of the servo valve is completed through an electric closed loop; and the piezoelectric electro-hydraulic servo valve has the advantages of pollution resistance, convenience in mounting and adjustment and reliable performance.

The invention relates to the technical field of antifogging of resin spectacle lenses, in particular to a wear-resistant antifogging easy-to-clean resin spectacle lens and a manufacturing method thereof. The two surfaces of the resin lens comprise five layers of structures from inside to outside, namely a first silicification hardening film layer, a second nanometer aluminum oxide film layer, a third composite antireflection film layer, a fourth nanometer silicon dioxide film layer and a fifth nanometer super-hydrophilic anti-fog film layer. The manufacturing method of the wear-resistant anti-fog easy-to-clean resin spectacle lens comprises the following steps: plating a silicification hardening film layer on the resin lens; sequentially plating a nano aluminum oxide film layer, a composite anti-reflection film layer and a nano silicon dioxide film layer on the resin lens in vacuum; enhancing and activating the film layers of the resin lens; plating a nano super-hydrophilic anti-fog film layer on the resin lens and the like. Through the steps, the problems of surface fogging, blurred sight and the like under the scenes of alternate cooling and heating, hot food and hot soup during dining in winter, wearing of masks and the like of the spectacle lenses are fundamentally solved, and great convenience is brought to vast spectacle wearers.