371results about How to "Achieve modification" patented technology

The invention provides an amino-functionalization magnetic silicon dioxide-ferroferric oxide composite nanomaterial. The material is characterized in that a microsphere structure is formed as magnetic ferroferric oxide is used as an inner core, silicon dioxide is used as an outer-layer coating material, amino groups with positive charges are used as functionalization modifying groups. The invention also provides a preparation method of the material, and an application of the material in water environment pollutant trace chemistry detection. The material is simple in preparation method, low in cost, high in extraction efficiency and high in adsorptive property, has selectivity on complex organic pollutants, is a reproducible environment-friendly novel material, and can be applied in trace chemistry analysis of a plurality of kinds of complex organic pollutants (particularly pollutants with negative charges) in a water environment.

The invention discloses a surface modification method of aramid, a reinforced natural rubber material and a preparation method thereof. The surface modification method of aramid comprises the following steps of: dipping aramid fibre for 0.5-3h by using phosphoric acid solution at 20-50 DEG C, after cleaning and drying, dipping aramid fibre for 1-2h by using acetone solution of epoxy resin with the mass percentage concentration of 5-20% at normal temperature, and then modifying the surface of aramid after drying. According to the invention, active groups of surface modified aramid and terminated hydroxyl of epoxy resin and liquid rubber are chemically reacted simultaneously at mixing temperature, so that the interfacial bonding strength is improved; liquid rubber and matrix rubber are vulcanized together in the subsequent vulcanizing process of mixing rubber, so that a cross-linked network tightly combined with aramid fibre is formed; the problem that the matrix rubber in an original physical manner forms a self cross-linked network while being vulcanized is overcome, and therefore, negative phenomena of a rubber and aramid fibre interface can be reduced; and the aramid reinforced rubber composite material having good interfacial bonding and fibre dispersion can be formed.

The invention discloses a bobbin type device for degrading triclocarban (TCC) in water by virtue of dielectric barrier discharge coordinated with activated carbon fiber and a method of the device. The device comprises a cylindrical reactor, a water distributing groove communicated on the upper part of the cylindrical reactor, a circulating buffer container and a rod-like high voltage electrode and a grounding electrode which are respectively connected with the positive and negative electrodes of an alternating current high voltage power supply, wherein the rod-like high voltage electrode is arranged in the cylindrical reactor while the grounding electrode covers the outer wall of the cylindrical reactor; activated carbon fiber layers are fixedly arranged on the inner walls of the cylindrical reactor; porous baffle plates are arranged on the surfaces of the activated carbon fiber layers; the circulating buffer container is respectively communicated with a waste water inlet formed on the side wall of the water distributing groove and a waste water outlet formed in the bottom of the cylindrical reactor to form a waste water circulating pipeline. The device is simple in design and low in equipment investment, the degrading efficiency can be improved by fully utilizing ozone generated by catalysis of the activated carbon fiber, and moreover, regeneration of the activated carbon fiber is realized, so that the device can be applied to treating organic waste water which is difficult to be biochemically degraded.

The invention discloses a lithium-sulfur battery positive electrode material and a preparation method thereof. An electrostatic spinning solution with solutes of a carbon-containing polymer and a carbon-containing polymer and transnational metal salt is prepared firstly, and electrostatic spinning and carbonization processing are performed to obtain a dual-layer flexible transitional metal-in-situ-doped carbon nanofiber base material; then, liquid phase sulfur loading is performed through a sublimed sulfur / carbon disulfide solution to obtain a sulfur-loaded dual-layer carbon nanofiber base material; next, a four-layer carbon nanofiber base material with carbon nanofiber layers with in-situ doped transitional metal and uniformly loaded with sulfur in the middle two layers is constructed; then the temperature is heated to 150 DEG C and maintained for 15min; furnace cooling is performed to obtain the lithium-sulfur battery positive electrode material; the sulfur content is 40-60%; when the lithium-sulfur battery positive electrode material is directly used as the positive electrode of the flexible binder-free and self-supported lithium-sulfur battery, very high discharge specific capacity and stable cycle performance are achieved; and the high-rate charging-discharging performance is obviously improved compared with that of the lithium-sulfur battery positive electrode material inthe prior art.

The invention discloses an oil-resistant raw material for preparing fluorinated silicone rubber-modified silicone rubber. The raw material is characterized by comprising the following components in parts by mass: 50-90 parts of methyl vinyl silicone rubber, 10-50 parts of methyl vinyl trifluoro-propyl silicone rubber, 30-40 parts of fumed silica, 1-3 parts of high-activity magnesia, 0.5-2.5 parts of AN (Acrylic Nitrile)-3, 2-5 parts of dimethyldimethoxysilane, 50-90 parts of kieselguhr, 40-80 parts of titanium pigment and 0.5-1.2 parts of 2,5-dimethyl-2,5-ditert-butyl hexane peroxide. By adopting the raw material, the oil resistance of the silicone rubber is effectively improved, the volume change of ASTM resistant 3# oil (150 DEG C*70h) is not greater than 15 percent, and a formula can be applied to oil resistant occasions by partially substituting the fluorinated silicone rubber.

The invention relates to a modified carbon black particle and a preparation method and application thereof. A carbon nanomaterial is added in the carbon black pelletizing process, and the modified carbon black particle is obtained after pelletizing; the carbon nanomaterial comprises a graphene material and / or carbon nanotubes; the particle diameter of the modified carbon black particle is 1-5 mm;and the modified carbon black particle is adopted as a reinforcing agent of a conductive filler or heat conduction or tire rubber. According to the preparation method, the carbon nanomaterial can be evenly dispersed in carbon black, electric conductivity of the carbon black is improved to the greatest extent, and subsequent dispersity during mixing with a polymer material is also facilitated.

The invention discloses a preparation method for a practical ferric oxide-modified titanium dioxide high-efficiency visible photocatalyst, which belongs to the field of treatment of environmental wastewater. The objective of the invention is mainly to overcome the disadvantages of low visible light absorption properties of titanium dioxide, a great number of steps for preparation of ferric oxide-modified titanium dioxide (Fe2O3 / TiO2) and the like. The preparation method provided by the invention only employs commercial P25 and ferriferrous oxide (Fe3O4) nanoparticles as raw materials and carries out calcination by using a gradient heating program so as to allow Fe3O4 powder to be directly converted into ferric oxide (Fe2O3) and to be fully fused with P25, and thus, the high-efficiency Fe2O3 / TiO2 visible photocatalyst is prepared. The method provided by the invention is extension and further expansion of preparation technology for metal oxide doped titanium dioxide and is provided to overcome the disadvantages of poor solar energy utilization capability, difficulty in mass production and the like of photocatalysts. The prepared Fe2O3 / TiO2 visible photocatalyst can be extensively applied to the fields of purification of atmospheric pollution and waste water, etc.

The invention discloses special rubber powder for a non-cured rubber asphalt waterproof coating and a preparation method thereof. The special rubber powder is prepared from, by weight parts, 50-65% of tire rubber powder, 20-40% of butyl rubber powder, 0.1-1.5% of activator, 0.1-1.0% of viscosity reducer and 5-15% of separant. The preparation method comprises the following steps: 1) stirring the tire rubber powder and the butyl rubber powder; 2) heating the activator and spraying the activator to the rubber powder obtained in the step 1), and then performing stirring and pre-activation; 3) mixing the pre-activated rough rubber powder obtained in the step 2) with the viscosity reducer and the separant, forming fine rubber powder through grinding, sieving the fine rubber powder, and performing packaging to obtain the finished product. Through the compounding of the waste tire rubber powder and the butyl rubber powder, the performance can meet the creep property, cohesiveness, self-healing property and ageing resistance requirements of the non-cured rubber asphalt waterproof coating. The added amount of plasticizer and polymerization modifiers is reduced effectively, and the cost can be reduced by over 10%.

The invention relates to a straw base composite material and a preparation method thereof. Straws which are sliced serve as the main raw material of the composite material, and a thermoplastic macromolecule binding agent which is similar to the straws in structure and high in compatibility and has a certain polymerization degree and polar groups is adopted. The straw base composite material comprises the following raw materials in percentage by mass: 50 to 80 percent of straws and 50 to 20 percent of binding agent. The straws and the binding agent are uniformly mixed under a medium of water and aqueous emulsion, simultaneously micro-adjustment and modification of the composite material are realized, and the mixture is thermally molded in an iron die or a stainless steel die. The straw raw material is specially treated, the thermoplastic macromolecule binding agent is selected, and a method for mixing the raw materials in the special medium is adopted, so that the prepared composite material is extremely high in compatibility and relatively high in strength and comprehensive performance, can be machined into products for daily use, articles and toys and has wide application prospect.