8 results about "Chemical bond" patented technology

The invention discloses a composite phosphate type anode material for a lithium ion battery, and a preparation method thereof. The composite phosphate type anode material can cause the raw material containing metals, lithium and phosphorus source and/or superfine LiMPO4 and/or superfine Li5-yM'2(PO4)3 to react under inert or reducing atmosphere and high temperature to synthesize LiMPO4 and Li5-yM'2(PO4)3 composite phosphate with combined chemical bonds, and by adding a conductive agent ball grinder, the composite anode material with excellent electrochemical performance can be obtained. The composite anode material prepared by the method has the advantages of low cost, unique process method and good electrochemical performance; the industrialization is easy to achieve.

The invention discloses a polymethyl methacrylate-zinc hydroxide nanocomposite and a preparation method thereof. The nanocomposite is powder of which the grain size is 5-40mum. The nanocomposite is formed by connecting zinc hydroxide nanosheets and polymethyl methacrylate in mass percent of (1-40):(60-99) by Zn-O chemical bonds. The zinc hydroxide nanosheets are 5-50mum long, 5-50mum wide and 50-500nm thick, and the polymethyl methacrylate is 50-500nm in grain size. The preparation method comprises the following steps of mixing soluble ammonium salt, soluble zinc salt and water firstly and evenly stirring to obtain mixed solution, adding the polymethyl methacrylate to the mixed solution and stirring to obtain complex solution, subsequently, adding an emulsifying agent to the complex solution and severely stirring to obtain emulsion, then, adding an initiating agent to the emulsion to obtain composite emulsion, and then, putting the composite emulsion in vacuum for drying to obtain a target product. The polymethyl methacrylate-zinc hydroxide nanocomposite is excellent in heat stability, and can be widely used in the field of aviation, automobiles, electronic instruments, consumer goods and the like.

The present invention relates to a surface-modified ultraviolet blocking powder obtained by reacting an ultraviolet blocking powder including a chloroacetyl group, a phospholipid monomer including an unsaturated bonding, and a catalyst inducing the reaction of the chloroacetyl group and the unsaturated bonding. According to the surface-modified ultraviolet blocking powder of the present invention, the surface may be modified using an effective method, and through chemical bonding (covalent bonding) and as a result of surface modification, the stability of the powder is high. In addition, since the surface modification is performed by using a biocompatible component, the ultraviolet blocking composition including the surface-modified ultraviolet blocking powder may provide ultraviolet blocking properties and biocompatibility at the same time.

The invention provides a preparation method of a temperature-resistant and salt-tolerant nano oil displacement agent. The preparation method comprises the following steps: modifying polyacrylamide to surfaces of silica nanoparticles through chemical bonds to obtain nano-composite particles with stable performance, and then using the nano-composite particles together with alkali and a surfactant to prepare the nano oil displacement agent. The nano oil displacement agent can solve the problem about high possibility of falling off of a polymer on the surface of a traditional nano oil displacement agent in the formation moving process, so as to achieve an excellent oil displacement effect. Especially in the high-temperature and high-salt formation, the nano oil displacement agent can overcome harsh formation conditions and cannot reduce the oil displacement effect.

The invention belongs to the technical field of biomedical materials and particularly relates to a silicon-phosphorus-based composite stent as well as a preparation method and application thereof. The preparation method disclosed by the invention comprises the following steps: (1) dispersing silicon-phosphorus nanosheets, and then, adding an organic matter for reaction to obtain organic matter modified silicon-phosphorus nanosheets; (2) ultrasonically dispersing the organic matter modified silicon-phosphorus nanosheets, adding a biopolymer material, and carrying out uniform mixing to obtain a precursor; and (3) adding a cross-linking agent into the precursor, injecting the mixture into a mold, and performing ultraviolet irradiation to form a three-dimensional cross-linked network, thereby obtaining the silicon-phosphorus-based composite stent. According to the silicon-phosphorus-based composite stent as well as the preparation method and application thereof, silicon-phosphorus nanosheets are modified by the organic matter, the organic matter forms an organic coating layer on the surface of each silicon-phosphorus nanosheet, and the silicon-phosphorus nanosheets and the organic coating layers are combined through chemical bonds or Van der Waals force, so that the stability of the silicon-phosphorus nanosheets can be improved, and the dispersity of the silicon-phosphorus nanosheets in the composite stent can be improved.

The invention discloses a preparation method of a Schiff base sensitized graphene composite titanium dioxide photocatalyst. Nano TiO2 and nano graphene oxide are modified through a silane coupling agent, then a Schiff base is formed through terephthalaldehyde and amino, and TiO2 and graphene oxide are linked through the Schiff base group to realize chemical bond linking of the graphene, a dye and the TiO2 to obtain the Schiff base sensitized graphene composite titanium dioxide photocatalyst. The photocatalyst synthesized by the invention is sprayed into a closed space of a glass box with a certain volume, a certain amount of formaldehyde aqueous solution is added to volatilize the photocatalyst, then the photocatalyst is irradiated under a fluorescent lamp for 48 hours, and then the concentration of formaldehyde is tested. Experiments prove that the removal effect of the synthesized photocatalyst on gaseous formaldehyde is obviously improved, and the removal efficiency on formaldehyde within 48 hours is 89%.

The invention discloses a nitrogen-phosphorus flame-retardant polystyrene block copolymer and a preparation method thereof. By blocking flame retardant macromolecules on a polystyrene molecular chain,the problems that due to the fact that flame retardant molecules and a polystyrene base material are only physically mixed, the chemical bonding effect does not exist, the bonding acting force between the flame retardant molecules and the polystyrene base material is weak, and flame-retardant components are lost are solved; and the problem that the long-term flame-retardant performance of the product is influenced is solved, and the polystyrene material with good flame retardant property and excellent mechanical property is obtained.