33results about How to "Nano size effect" patented technology

The invention relates to an electromagnetic shielding composite fabric as well as preparation and application thereof. The electromagnetic shielding composite fabric comprises: a carbon nanotube / graphene composite film (1), a polyaniline thin film (2), a binding agent (3) and a base fabric (4), wherein graphene in the carbon nanotube / graphene composite film is compounded on the upper surface of a carbon nanotube film; the polyaniline thin film is adhered to the lower surface of the carbon nanotube film through the binding agent. The preparation comprises: depositing a graphene suspension solution on one layer of a carbon nanotube thin film and naturally airing at room temprature to obtain a graphene / carbon nanotube composite film; adhering the polyaniline thin film on the lower surface of the carbon nanotube thin film through the binding agent to obtain a carbon nanotube / graphene / polyaniline composite film; the base fabric is adhered to the surface of the carbon nanotube / graphene / polyaniline composite film through the binding agent and then is cured to obtain the product. The electromagnetic shielding composite fabric prepared by the invention has a good electromagnetic shielding performance and can also keep the characteristics of air permeability, flexibility, foldability, binding property and the like of a fabric material.

The invention discloses a paste-like water-based rubber release agent and its preparation method and application method. Its components include 3-15 parts of inorganic powder additives, 0.1-1.0 parts of anionic surfactant, and 0.5-1.0 parts of anionic surfactant in parts by mass. 5.5 parts of nonionic surfactant, 5-10 parts of thixotropic agent, 0.2-2.0 parts of thickener, 0.1-0.5 parts of defoamer, 60-100 parts of deionized water. Mix water and surfactant, stir to dissolve, add inorganic powder additives, add defoamer dropwise, add thixotropic agent and thickener in batches, stir well and grind until homogeneous to obtain the release agent. When in use, make an aqueous solution at a mass ratio of 1:3 to 15, add it to the water cooling tank of the film, the film is cooled by water while the release agent is applied, and it can be stacked after air drying on the hanging rod. The invention is easily soluble in water, non-toxic, tasteless, simple in process and low in cost, and basically has no influence on the subsequent processing performance of rubber.

The invention discloses a preparation method of a lignin nanoparticle and belongs to the chemical field of nanometer materials. The preparation method comprises the following steps of: dissolving a lignin raw material through an organic solvent; removing impurities; dropwise adding a proper amount of inorganic acid into filtrate to form lignin colloid; adding a cross-linking agent to perform cross-linking reaction with the lignin colloid; and adding water and stirring to dialyze to form lots of lignin nanoparticles of which the particle size is between 20nm to 200nm. The prepared lignin nanoparticle is excellent in dispersing performance and absorbing performance, and is expected to be applied to dispersing agents for wastewater treatment, dye, pesticide, water-coal-slurry systems and the like. The preparation method, disclosed by the invention, is simple and feasible; all the adopted solutions can be recovered, no adverse impacts are brought to the environment, and good application prospect is provided.

The invention relates to an electromagnetic shielding composite membrane material and preparation and application thereof. The electromagnetic shielding composite membrane material comprises a graphene / carbon nanotube composite membrane (1), a polyaniline membrane (2) and protective layer resin (4). The polyaniline membrane (2) adheres to the surface of a carbon nanotube thin film in the graphene / carbon nanotube composite membrane through an adhesive (3). The preparation includes the steps that graphene suspension liquid is deposited on the carbon nanotube thin film, and the mixture is naturally aired at room temperature to obtain the graphene / carbon nanotube composite membrane; the polyaniline membrane adheres to the surface of the carbon nanotube thin film in the graphene / carbon nanotube composite membrane through the adhesive to form a graphene / carbon nanotube / polyaniline composite membrane; then the upper surface and the lower surface of the composite membrane are coated with the resin, curing is carried out, and the electromagnetic shielding composite membrane material is obtained. The electromagnetic shielding performance of the electromagnetic shielding composite membrane material is excellent, and meanwhile the electromagnetic shielding composite membrane material can bear certain bending and compression deformation; the flexible electromagnetic shielding membrane can be widely applied to the fields such as intelligent wearable garments and multifunctional electromagnetic protection fabric.

The invention provides a printing and dyeing wastewater treatment agent and a treatment method. The printing and dyeing wastewater treatment agent comprises a modified nano-starch adsorbent and a modified nano-starch flocculant. According to the treatment agent, nano-starch is adopted to serve as an adsorbent matrix, and citric acid is added for esterification crosslinking with nano-starch particles; and then acrylamide is grafted to the nano-starch particles through a potassium persulfate initiator to obtain the modified nano-starch adsorbent. Besides, the nano-starch is further adopted to serve as a flocculant matrix, 3-chloro-2-hydroxypropyl trimethylammonium chloride is used as a cationic etherifying agent, sodium hydroxide is used as a catalyst, and the modified nano-starch flocculantis prepared. The invention further provides the treatment method of the printing and dyeing wastewater. According to the treatment method, firstly, the pH value of the to-be-treated printing and dyeing wastewater is regulated; and the modified nano-starch adsorbent and the modified nano-starch flocculant are sequentially added in two steps and are stirred for a full reaction. Through the treatment method, the dye and heavy metal pollutant adsorption and flocculation properties are excellent without secondary pollution.

The invention relates to the field of polyethylene composite materials, in particular to a preparation technology for a carbon nanotube / nickel / aluminum in-situ enhanced polyethylene based composite material, and aims to provide a method for keeping controllable contents and uniform dispersion and distribution of the carbon nanotubes and metal composite powder in a polymer based composite materialand keeping good interface infiltration of carbon tubes and a base and high binding strength. The method comprises the following steps of: synthesizing CNTs (Carbon Nanotubes)-Ni-Al composite powder with uniformly dispersed CNTs, excellently kept structure and controllable content by using a chemical vapor deposition method; and doping the in-situ composite powder into a polyethylene base by using a melt blending method so as to prepare the CNTs / Ni / Al / polyethylene based composite material with high strength and modulus and excellent conductivity and heat-conducting property. By adopting the composite powder, the proportion of the carbon nanotubes, nickel and aluminum can be controlled excellently; meanwhile, the problem of dispersion of the metal and the carbon nanotubes in the composite material can be solved well; the carbon nanotubes do not agglomerate in the composite powder and are widely dispersed to achieve a nano-size effect; and the carbon nanotubes have high binding strengthwith the base, so that the polyethylene based composite material can be effectively enhanced by the carbon nanotubes and the aluminum, and the comprehensive performances such as strength, conductivity, heat conduction and the like of the composite material are greatly improved.

The invention discloses a tubular titanium dioxide nano composite Sb adsorbent loaded with zirconium dioxide and ferroferric oxide and a preparation method and application thereof. the preparation method comprises the following steps of: (1) preparing a nano titanium dioxide pipe from TiO2 nano particles by using an alkaline hydrothermal method; (2) preparing zirconium chloride stock solution andstock solution containing ferric chloride and ferrous chloride respectively; (3) loading ZrO2 and Fe3O4 on the nano titanium dioxide tube to prepare the ZrO2 and Fe3O4 loaded tubular TiO2 nano composite Sb adsorbent, which is marked as ZrO2@Fe3O4@TiO2NTs. The adsorbent can adsorb Sb (III) and Sb (V) in a water body at the same time, the adsorbent with unit mass has high Sb adsorption efficiency, the separation of the adsorbent and the water body can be simply achieved under the action of a magnetic field, and the recovery efficiency of the adsorbent is high.

The invention discloses a method for quickly synchronously preparing lignin nano-particles and carbon quantum dots. The method includes particular steps of adding abandoned biomass into acid solution,carrying out microwave treatment, and then separating solid from liquid to obtain treating fluid; centrifugally separating the treating fluid to obtain lower-layer precipitates and supernatant liquor. The lower-layer precipitates are the lignin nano-particles, the supernatant liquor is nitrogen-doped carbon quantum dot solution, and solvents in the acid solution are mixed solvents with ethyl alcohol. The method has the advantages that biomass nano-materials with different sizes can be quickly synchronously prepared from the abandoned biomass by the aid of the method and include the lignin nano-particles (with the sizes of 100 nm) and the fluorescent nitrogen-doped carbon quantum dots (with the sizes of 2-3 nm), and accordingly the universality of the traditional method for preparing the nano-materials can be greatly improved; the method is quick, green and simple and is low in cost, and industrial production can be facilitated.

The invention belongs to the technical field of anticorrosive coatings, and specifically relates to a metal base waterborne graphene modified long-acting anticorrosive paint and a preparation method thereof. The metal base waterborne long-lasting anticorrosive paint comprises the following raw materials in parts by weight: 40-50 parts of composite modified styrene-acrylic emulsion, 10-20 parts ofmodified graphene, 15-25 parts of pigment, 0.5-1 part of an antifoaming agent, 0.3-0.8 part of a leveling agent, 0.5-1 part of a waterborne drier, 0.5-1 part of a wetting agent, 0.8-1.2 parts of an anti-settling agent, 0.1-0.5 part of a dispersant, and 20-35 parts of deionized water. The preparation method comprises: (1) preparation of modified graphene; (2) pigment surface modification; and (3) preparation of the waterborne paint. The metal base waterborne graphene modified long-acting anticorrosive paint has the advantages of long-lasting excellent anticorrosive performance, strong base adhesion, high mechanical strength, excellent friction resistance, excellent solvent resistance and weather resistance, strong construction adaptability and the like; the preparation method is simple, easy to operate, low in raw material and energy consumption costs, environmentally-friendly and pollution-free; the coating is quickly dried, and the construction period is short.

The invention discloses a dynamic solvent-responsive nanofiber-based flexible transparent composite membrane and a preparation method thereof, belonging to the technical field of composite membranes. The composite film is a three-dimensional network structure formed by the cross-linking reaction of nanofibers and monomers with a refractive index between 1.48 and 1.6 in the nanofiber gap. The transparency of the composite film is regulated by controlling the ratio of nanofibers to monomers. And for the transparent composite film, it can undergo a reversible change from transparent to opaque under the stimulation of a solvent or water vapor with a refractive index distribution between 1.3 and 1.4. The composite film can be widely used in the fields of architecture, interior decoration design, culture and education, meeting rooms and the like.

The invention provides a flexible stretchable electromagnetic shielding film and a preparation method thereof. The preparation method of the flexible stretchable electromagnetic shielding film comprises the following steps: selecting an elastic membrane as an elastic adhesion matrix, stretching the elastic membrane to a certain elongation, then fixing the elastic membrane, and coating a liquid elastic adhesive layer on the surface of the elastic membrane; crushing a flexible nano electromagnetic shielding complex film on the liquid elastic adhesive layer, coating resin with protective effect at the upper side of the flexible nano electromagnetic shielding complex film to form a resin layer, and curing the liquid elastic adhesive and the resin under certain conditions; and releasing a tensile force applied onto the elastic adhesion matrix, so as to drive the flexible nano electromagnetic shielding complex film to retract, namely the flexible stretchable electromagnetic shielding film is obtained. The prepared flexible stretchable electromagnetic shielding film has good elasticity, high elongation (20-50%) and excellent electromagnetic shielding property (electromagnetic wave absorptivity is more than or equal to 99% at the frequency of 1-5GHz) and can bear certain bending and compression deformation.

The invention discloses a tungsten carbide / porous carbon composite material and a preparation method thereof and application of the tungsten carbide / porous carbon composite material in electrochemicalhydrogen production. The tungsten carbide / porous carbon composite material has a nanometer size effect and high porosity, tungsten carbide and foreign-atom-doped porous carbon materials are tightly bound and can be synergistically catalyzed, stability is improved, and therefore, the composite material exhibits good catalytic properties in the electrochemical hydrogen production process and good stability of which the precious metal does not have, and efficient utilization of energy is realized. The preparation method has a simple preparation process, and adopts abundant tungsten in the natureas a raw material, thereby realizing effective utilization of tungsten resources.