6results about How to "Prevent reaggregation" patented technology

This invention relates to the field of carbon nanotube technology, specifically disclosing a high-viscosity carbon nanotube conductive paste and its preparation method. The raw materials for this high-viscosity carbon nanotube conductive paste include ultra-long single-walled carbon nanotubes, short-cut multi-walled carbon nanotubes, conductive carbon black, carboxyl-terminated hyperbranched polyester-polyethylene glycol block copolymer, polyacrylic acid, fluorinated silane coupling agent, γ-butyrolactone, and N-methylpyrrolidone. The high-viscosity carbon nanotube conductive paste provided by this invention achieves uniform dispersion, low volume resistivity, excellent anti-settling properties, and good coating processability of the carbon nanotube conductive paste under high solids content through the synergistic effect of the carboxyl-terminated hyperbranched polyester-polyethylene glycol block copolymer, the fluorinated silane coupling agent, and polyacrylic acid, combined with multi-stage grinding and high-pressure homogenization processes.

The invention discloses a polycarbonate composite material as well as a preparation method and application thereof, and belongs to the technical field of polymer composite materials. The polycarbonate composite material is prepared from the following raw materials: graphite, a thermoplastic elastomer, polycarbonate resin and boron nitride. Carrying out dry ball milling on the graphite and the thermoplastic elastomer to obtain a mixture containing the graphite nanosheet and the thermoplastic elastomer; according to the invention, the insulating heat-conducting filler boron nitride and the conductive heat-conducting filler graphite nanosheet are mixed with the polycarbonate matrix, so that the boron nitride can isolate a conductive path of the graphite nanosheet, and the insulating heat-conducting filler boron nitride forms a heat-conducting network and maintains the electrical insulation property; and the advantage that the conductive and heat-conducting filler graphite nanosheet contributes to efficient heat conduction of the polycarbonate composite material can be fully exerted.

The invention discloses a polyacrylate compound for acid dye printing replacing urea and a synthesis method, belonging to the technical field of polymer material synthesis. The polyacrylate compound for acid dye printing replacing urea comprises a polymerization monomer, a cross-linking monomer, a composite emulsifier and an initiator, the polymerization monomer comprises at least an acrylic acid monomer, an acrylic ester and sodium styrene sulfonate, and also comprises itaconic acid or maleic anhydride, the cross-linking monomer comprises diallyl phthalate, the composite emulsifier comprises a reactive emulsifier, a nonionic emulsifier and / or an anionic emulsifier, the above raw materials are subjected to emulsion polymerization in a redox system to obtain the polyacrylate compound for acid dye printing replacing urea, the polyacrylate compound forms a network structure in an extended state, and the ability to bind water molecules and the network coating and holding water can be greatly improved in combination with the multiple anionic groups possessed by the polyacrylate compound, the polyacrylate compound has excellent moisture absorption, moisture retention, osmotic solubilization, dispersion and other properties, and has excellent environmental protection.

The present application relates to a kind of refractory dispersant and its preparation method in the technical field of refractory additive, it is the comb structure copolymer, the copolymer includes styrene-maleic anhydride copolymer main chain, polyethylene glycol side chain grafted on the styrene-maleic anhydride copolymer main chain by ester bond, and phosphate radical;The polyethylene glycol side chain includes short-chain polyethylene glycol with molecular weight of 400-600 and long-chain polyethylene glycol with molecular weight of 800-1200.The present application realizes the precise division of function by using asymmetric compound polyethylene glycol side chain of specific molecular weight range, and controls esterification grafting degree is 50%-85%, not only can provide excellent initial wetting and dispersion force, ensure that slurry has excellent construction fluidity, but also can effectively prevent particle re-aggregation and sedimentation under static or shear, so as to fundamentally solve the technical problem that traditional dispersant is difficult to consider high initial fluidity and long-term anti-settling property, plasticity.

The invention relates to a C-CNTF / HfC-SiC ceramic matrix composite material and a preparation method thereof. The preparation method comprises the following steps: carrying out shearing dispersion treatment on HfC powder and optional graphene in a solvent to prepare a slurry dispersion liquid; impregnating fiber cloth by using the slurry dispersion liquid, drying and curing; laminating the fiber cloth, and sewing the fiber cloth in the Z direction by using continuous carbon nanotube fibers; dipping with HfC slurry, drying and curing; and dipping by using a polycarbosilane precursor, and then curing and cracking to obtain the ceramic-based composite material. The invention also relates to the composite material prepared by the method. According to the method, solid slurry with stable dispersibility is obtained by graphene-assisted shearing dispersion; uniform impregnation of the slurry is realized by adopting a multi-stage vacuum-pressure impregnation mode; directional regulation and control of the heat conductivity are realized through Z-direction sewing of the carbon nanotube fibers; finally, the composite material with excellent mechanical property and thermal protection property is obtained.

The invention relates to an antibacterial polyamide fiber and a preparation method thereof, and belongs to the technical field of fiber preparation, and the preparation method specifically comprises the following steps: firstly, carrying out acid oxidation treatment on a multi-walled carbon nanotube to increase oxygen-containing functional groups such as carboxyl on the surface of the multi-walled carbon nanotube and improve the dispersity of the multi-walled carbon nanotube in an aqueous solution; then, a surfactant is used for further modifying the multi-walled carbon nanotubes subjected to acid oxidation treatment, the compatibility between the multi-walled carbon nanotubes and polyamide master batches is enhanced, and therefore uniform distribution of the multi-walled carbon nanotubes in the polyamide fibers is achieved. And mixing the dopamine modified carbon nanotubes, metal salt ions, a flexibilizer and polyamide master batches to prepare the polyamide fiber with excellent antibacterial and bacteriostatic properties. According to the method, not only are the dispersity and compatibility of the multi-walled carbon nanotubes in the polyamide fiber improved, but also chelation of metal ions is realized through metal-ion coordination bonds and an adsorption effect, and the antibacterial effect of the polyamide fiber is further enhanced.