35results about How to "Play the role of "bridge"" patented technology

The invention provides a high-content water-based resistance reducing agent and a preparation method thereof, and solves the technical problems in the prior art that a powder resistance reducing agentis low in hydration speed, oily residues exist after gel breaking of an oily suspension resistance reducing system, environmental friendliness is not achieved and the powder content of a water-basedresistance reducing suspension system is low. The preparation comprises the following raw materials in parts by weight: 20-50 parts of polyacrylamide; 20-40 parts of polymethacrylamide; 22-66 parts ofa solvent A; 4-12 parts of a solvent B; 6-18 parts of a solvent C; 1-3 parts of a suspending agent; and 3-6 parts of a surfactant, wherein the solvent A is alkyl amides; the solvent B is polyethyleneglycol; and the solvent C is polyhydric alcohol or polyhydric alcohol esters. The high-content water-based resistance reducing agent not only has the characteristics of high hydration speed, high powder content and good storage stability, but also can realize integrated operation and online blending.

The present invention belongs to the technical field of material modification, and particularly relates to a modification method for surface treatment of nanoparticles in a supercritical ethanol state. The modification method specifically comprises: 1, uniformly mixing ethanol and a nanometer oxide (particle size of 20-100 nm), placing in a reaction kettle with a pressure gauge, and strictly sealing; 2, placed the sealed reaction kettle in a heating furnace with a temperature control device, and heating at a temperature of 240+ / -1 DEG C; 3, observing the value of the pressure gauge on the reaction kettle, starting timing when the value of the pressure gauge achieves 6+ / -0.5 MPa, and carrying out a thermal insulation and pressure maintaining reaction for 5-10 min; 4, immediately placing thereaction kettle into a cooling pool, and cooling for 30-60 min, wherein cooling water is an ice water bath, and the temperature is 0 DEG C; and 5, taking out the treated nanoparticles, placing in a 130 DEG C vacuum oven, drying for more than 6 h, and grinding in a mortar after completely drying to obtain the surface-treated nanoparticles.

The invention discloses a sodium humate binder solution for iron ore pellets and its preparation method and application. The solute of the sodium humate binder solution is composed of sodium humate, sodium hydroxide and a viscosity regulator, and the solvent It is water, and the viscosity modifier is one or more of the soluble salts of Al3+, Fe3+, Ca2+, Mg2+. The preparation method is to dissolve sodium humate in NaOH solution, then add the viscosity modifier and stir evenly, Promptly obtained; the preparation method of this sodium humate binder solution is simple to operate and low in cost, and the prepared sodium humate binder solution is added in the iron ore concentrate during the pelletizing process of the iron ore pelletizing process, which can effectively It improves the strength of green pellets and the total iron grade of finished pellets, and has the characteristics of less consumption and is suitable for pelletizing various iron concentrates.

The invention relates to a high-dielectric composite material, as well as a preparation method and an application thereof. The composite material utilizes polyvinylidene fluoride as a basal body and a multi-walled carbon nanotube as a packing, a copper phthalocyanine oligomer is adopted to wrap the surface of the multi-walled carbon nanotube, and polyvinylidene fluoride is grafted, wherein the copper phthalocyanine oligomer plays a role of a flexible interface layer between the multi-walled carbon nanotube and the polyvinylidene fluoride so as to improve the compatibility of an interphase interface. Compared with an unmodified carbon nanotubes (CNTs) packing polymer composite material, the high-dielectric composite material adopts the copper phthalocyanine oligomer for the interphase interface, the dispersibility of the CNTs can be improved, the interface compatibility of organic / inorganic phases is also improved, and the interface polarization formation and transmission are benefited, so that the dielectric constant is increased, the breakdown field strength of the material is reduced, and the high-dielectric composite material is suitable for producing high-dielectric devices for electronic circuit boards.

The invention belongs to the technical field of walking mechanisms, and provides a smooth obstacle crossing walking mechanism which can maintain small friction loss and high efficiency while providing high smooth obstacle crossing capacity and is suitable for most daily use situations. The smooth obstacle crossing walking mechanism comprises a driving wheel and a contact wheel. The driving wheel is small in diameter, the contact wheel is large in diameter, the driving wheel can autonomously rotate around the axis of the driving wheel under the action of driving force, the driving wheel is compressed with the inner edge of the contact wheel under the action of gravity, the contact wheel makes contact with the ground, and when the driving wheel actively rotates, the driving wheel walks along the inner edge of the contact wheel under the action of friction force between the driving wheel and the contact wheel. The contact wheel rolls forwards under the action of gravity and friction force of the driving wheel, and walking of the smooth obstacle crossing walking mechanism is achieved.

The invention discloses an antibacterial plastic based on microwave synthesis of quaternary ammonium salt. The antibacterial plastic comprises the following components in parts by weight: 60-100 parts of main resin, 1-15 parts of modified tetraacicular zinc oxide whiskers , 2-20 parts of octadecylmethyl dihydroxyethyl ammonium bromide, 0.1-0.5 parts of ester coupling agent, 2-3 parts of dispersant, 0-2 parts of compatibilizer, 1-20 parts of nano-active calcium carbonate. The invention utilizes the modified four-needle zinc oxide whisker to carry out auxiliary antibacterial and utilizes its surface modification to improve the compatibility of nano particles and the main plastic, increase its dispersibility with nano active calcium carbonate, and make them form nano particles in the main resin. The intersecting network of particles jointly increases the strength of the antibacterial plastic and improves its mechanical properties; the preparation method is low in cost and suitable for industrial production, and the produced antibacterial plastic has good antibacterial performance and processing performance.

The present invention relates to the technical field of orthopedic materials, in particular to a composite polylactic acid biological material and a preparation method thereof. The composite polylactic acid biological material comprises the following raw materials in parts by weight: 10-15 parts of chitosan complex, 5-parts of silk fibroin 8 parts, 10-16 parts of hydroxyapatite, 0.2-5 parts of compatibilizer, 50-65 parts of lactide and 0.5-0.8 parts of silane coupling agent. Among them, the chitosan complex is prepared by electrospraying chitosan and hyaluronic acid / carbon nanotubes, and the hyaluronic acid / carbon nanotubes are mainly composed of aminated hyaluronic acid and carboxylated multi-walled carbon nanotubes. Tube reaction, obtained by dialysis. The composite polylactic acid biomaterial prepared by the invention not only has good biocompatibility, but also meets the requirements of bone mechanical properties, and its service life can fully meet the needs of patients, which solves the problem that the service life of existing orthopedic materials cannot fully meet the needs of patients.

The invention relates to a papermaking retention aid and its preparation method and application, belonging to the technical field of preparation of modified polyacrylamide. The method is as follows: uniformly mix acrylamide, cationic monomer, structure regulator, hydrophobic monomer, N-vinyl formamide and cationic surfactant with water to obtain a mixed solution; nitrogen and deoxygenate the mixed solution, and then add The polymerization aid initiates the polymerization reaction to obtain a colloidal substance, and then the colloidal substance is granulated, dried and crushed in sequence to obtain a copolymerized powder; the copolymerized powder is prepared into an aqueous solution of the copolymerized powder with water, and then liquid bromine and The sodium hydroxide aqueous solution is modified to obtain a modified treatment solution; the pH of the modified treatment solution is adjusted to 8-9, and then filtered through a filter membrane to obtain a paper-making retention aid. The papermaking retention aid prepared by the invention improves the retention rate of fine fibers, and when used in a papermaking process, can improve papermaking production efficiency, avoid blocking of water filtration channels, and effectively reduce white water turbidity.

The invention provides a preparation method of inorganic light-colored conductive titanium dioxide powder. The preparation method includes the steps of firstly, dispersing gel ATO into water to obtaingel ATO aqueous dispersion, and adding a peptizing agent into the gel ATO aqueous dispersion until pH is 8-12 to obtain clear and transparent ATO hydrosol; secondly, adding titanium dioxide slurry into the ATO hydrosol prepared in the first step to form a mixed solution a, wherein the titanium dioxide slurry is prepared by dispersing titanium dioxide into water; thirdly, dropwise adding acid intothe mixed solution a obtained in the second step to regulate pH to 2-6 to form a mixed solution b; fourthly, drying the mixed solution b, crushing, and performing high-temperature sintering to obtainthe inorganic light-colored conductive titanium dioxide powder. The preparation method has the advantages that the method is simple to operate, and the prepared inorganic conductive titanium dioxidepowder is low in resistivity and light in color.