33results about How to "Uniform network structure" patented technology

The invention relates to a hydrophobic silica aerogel heat-insulation composite material. The composite material consists of silica aerogel and an inorganic fiber product, wherein the silica aerogel is doped with a flame retardant and an infrared blocking agent; the inorganic fiber product comprises one or more of glass fibers, quartz glass fibers, aluminium silicate fibers, ceramic fibers, alumina fibers, zirconia fibers, rock wool fibers and basalt fibers, and the porosity of the inorganic fiber product is higher than 50%. The composite material has the overall waterproof performance, the extremely low heat conductivity coefficient and the excellent high-temperature heat-insulation performance, can pass an incombustibility test under the condition that the material is ensured to be hydrophobic as a whole, and reaches level A1 according to the incombustibility test; the preparation process is simple, the production cycle is short, the cost is lower, the equipment requirement is low, and reaction conditions are controllable.

The invention discloses a preparation method of a CuW70 contact material, comprising the steps of: adding inducing copper powder into tungsten powder in certain proportion and mixing them well, putting the mixed powder into a rubber sheath which is then placed in the high pressure cylinder of a cold isostatic pressing machine so as to be pressed into a skeleton green body, and then preparing the CuW70 contact material through copper infiltration of the sintered skeleton. Due to disappeared copper-rich area and uniform two-phase distribution of the prepared CuW70 contact material by the methodof the invention, the material has rapidly moving cathode spot on the surface, effectively dispersed electric arc, less copper phase splashing, and improved ablation resistance.

The invention discloses a preparation method of a cellulose based conductive hydrogel. The preparation method comprises the following steps: (1) dissolving microcrystalline cellulose (MCC) with 1-Butyl-3-methylimidazolium chloride, reacting in a N2 protective atmosphere, and adding N,N-methylenebisacrylamide and benzoyl peroxide to prepare a pure microcrystalline cellulose hydrogel; and (2) soaking the pure microcrystalline cellulose hydrogel obtained in the step (1) in a mixed solution of FeCl3 and sodium p-benzenesulfonate, and immersing in a pyrrole water solution to prepare the cellulose based conductive hydrogel. The cellulose based conductive hydrogel prepared by the method has the advantages of uniform stable network structure, excellent conductivity, swelling property and heat stability, favorable electric conductivity and favorable swelling property; and the equilibrium swelling rate can be up to about 500%.

The invention relates to a hyperbranched polyether functionalized graphene/epoxy resin nano composite coating as well as a preparation method and application thereof. The nano composite coating is composed of a component A and a component B, wherein the component A comprises a mixed resin, an antirust pigment, an inorganic pigment, mineral substance powder and an organic solvent; the component B is an epoxy resin curing agent; the mixed resin is composed of an epoxy resin and hyperbranched polyether functionalized graphene; and the hyperbranched polyether functionalized graphene is 2-10% of the mass of the epoxy resin. A coating prepared from the hyperbranched polyether functionalized graphene/epoxy resin nano composite coating can effectively shield corrosive substances, and shows excellent corrosion resistance, and especially the acid resistance of the nano composite coating is obviously improved and is improved by 50% compared with that of a pure epoxy resin coating.

The invention discloses a Ce,V and Er co-doped dental microcrystalline glass, and a preparation method and application thereof. The raw materials of the microcrystalline glass consist of SiO2, Li2O, K2O, P2O5, Al2O3, ZrO2, Na2O, CeO2, V2O52 and Er2O3. A glass block is obtained through a melt casting method, and microcrystalline glass easy for machining is obtained after crystallization treatment,and then secondary crystallization is carried out to obtain the finished product of the microcrystalline glass which takes Li2Si2O5 as a main crystalline phase. The microcrystalline glass has excellent bending strength, good semi-permeability, fluorescent property, uniform and full coloring and excellent stability. The color and the aesthetic effect of the microcrystalline glass reach the color and the aesthetic effect of A2 in a VITA-Classical colourimetric card and are consistent with the fluorescent characteristic and the semi-permeability of natural teeth, and the microcrystalline glass can be applied to dental whole-porcelain repair materials.

The invention discloses a preparation method of a CNT-GO/Cu composite material with a hierarchical structure and belongs to the field of metal-based composite material preparation. According to the preparation method, CNTs, GO, sodium hydroxide and copper acetate serve as raw materials, and the CNT-GO/Cu composite material with the hierarchical structure is prepared by adopting a molecule level blending method. The method has the beneficial effects that the process is simple, time is short, and energy consumption is low. Besides, due to the large specific surface area of GO and a high length-diameter ratio of CNTs, after the two are mixed, a mixed reinforced body with a net-shaped structure can be obtained, and the dispersion uniformity of a single reinforced body is improved. In addition,by continuously adjusting a pH value of a solution, the CNT-GO/Cu composite material with the hierarchical structure can be made. The composite material is composed of an enriched area (carbon-rich area) and a depleted area (carbon-poor area) of a carbon nanometer reinforced body, the carbon-rich area can effectively improve the strength of the composite material, and the carbon-poor area can effectively improve the toughness of the composite material, so that the composite material obtains good comprehensive performance.

The invention relates to a high-permeability and high-selectivity PVA/GA/CS-M<+> pervaporation film for dewatering an organic solution and a preparation method of the high-permeability and high-selectivity PVA/GA/CS-M<+> pervaporation film. The preparation method includes: heavy metal ions (M<+>) such as Ag<+>, Cu<2+> and Fe<3+> are used to chelate with CS (chitosan) to serve as the precursor, mixing the precursor with PVA (polyvinyl alcohol), and adding GA (glutaraldehyde) to serve as the crosslinking agent to obtain the high-permeability and high-selectivity PVA/GA/CS-M<+> pervaporation filmwhich is high in mechanical strength and heat stability and excellent in permeability and selectivity to the organic solution.

The invention belongs to the field of active pharmaceutical ingredient screening, and particularly relates to a lipid raft@organic-inorganic hybrid monolithic column as well as a preparation method and application thereof. According to the invention, an organic-inorganic hybrid monolithic column is used as a matrix, and the permeability and the specific surface area of the organic-inorganic hybrid monolithic column are superior to the permeability and the specific surface area of a traditional silica gel packed column; a lipid raft well modifies the surface of the organic-inorganic hybrid monolithic column; the prepared lipid raft@organic-inorganic hybrid monolithic column has a uniform net structure; and different screening requirements can be met by adjustment of the aperture and permeability of the organic-inorganic hybrid monolithic column and modification with lipid rafts from different sources. The lipid raft@organic-inorganic hybrid monolithic column can be applied as an affinity screening model to lipid raft chromatography stationary phase research and online drug screening research.

The invention relates to the technical field of polyamide material modification, in particular to an electromagnetic shielding polyamide material and a preparation method thereof. The electromagneticshielding polyamide material is prepared from the following raw materials in parts by weight: 75-85 parts of polyamide resin, 3-5 parts of PEDOT-g-MAH:PSS conductive powder, 10-15 parts of carbon fiber, 0.5-2 parts of a silane coupling agent, 0.1-0.5 part of an antioxidant and 2-3 parts of other auxiliary agents; the PEDOT-g-MAH:PSS conductive powder is prepared from 3,4-dioxyethylene thiophene, 3-thiophene acetic acid and sodium polystyrene sulfonate. The electromagnetic shielding polyamide material provided by the invention has excellent electromagnetic shielding performance and can effectively reduce the percolation threshold of carbon fiber in a composite material, and meanwhile, the material has excellent mechanical properties; a preparation process of the material is simple and easyto operate, and has an important practical application value.

The invention provides a carbon fiber reinforced plastic-thermoplastic laser thermal fusion welding technology. Laser surface pretreatment is conducted on carbon fiber reinforced plastic firstly, and a uniform net-shaped structure is obtained; then the laser welding work procedure is conducted, the carbon fiber reinforced plastic and thermoplastic are overlaid and positioned through pressure; and positioning laser welding is conducted on the thermoplastic and pretreated thermoplastic. According to the carbon fiber reinforced plastic-thermoplastic laser thermal fusion welding technology, the technical defect that an existing carbon fiber reinforced plastic-thermoplastic connecting technology is poor in manufacturability is overcome, the technical effects that after the carbon fiber reinforced plastic is pretreated, an extra adhesive does not need to be used, and subsequent clearing is not needed are achieved, the mechanical performance of obtained weld joints is excellent, the welding efficiency is high, and manufacturing cost is reduced.

The invention relates to a preparation method and application of a composite aerogel filter disc, and the preparation method comprises the following steps: S1, preparing a CNF/PVA/BAC mixed suspension: adding BAC nanoparticles into the CNF suspension at room temperature, then adding a PVA aqueous solution to prepare the CNF/PVA/BAC mixed suspension according to the mass ratio of CNF: PVA: BAC being equal to 1: (0.1-1.0): (0.5-2.0), and adding deionized water to prepare 0.05-2.5 wt% of CNF; and S2, preparing a CNF/PVA/BAC composite aerogel filter disc: performing ultrasonic treatment on the CNF/PVA/BAC mixed suspension liquid treated in the S1 in an ice bath for 10 minutes by using an ultrasonic processor, then transferring the mixed suspension into a culture dish, and performing pre-freezing by using liquid nitrogen or an ultralow-temperature refrigerator; a freeze drying process is adopted, the temperature ranges from minus 80 DEG C to minus 40 DEG C, the vacuum degree ranges from 0.5 Pa to 3 Pa, the drying time ranges from 48h to 80h, and the CNF/PVA/BAC composite aerogel filter disc is obtained. The invention aims to provide the novel filter disc with the filtering efficiency of 95-98%.

The invention discloses hydrogel synergistically constructed by macromolecular self-assembly and metal coordination, and relates to the field of biomedical high polymer materials, and the hydrogel is prepared by the following steps: firstly, preparing nano-scale spherical casein micelles with negative charges on the surface by utilizing the characteristic that casein can be self-assembled into micelles in an aqueous solution; secondly, metal ions are added and reassembled with the casein micelles to form a spherical aggregate with the metal ions on the surface; and then adding an organic small molecule compound containing disulfide bonds to generate dynamic coordination bonds with metal ions, thereby preparing the nanoscale micelle cross-linking agent. And finally, introducing the nano-micelle cross-linking agent into a monomer solution, and constructing the high-strength multifunctional hydrogel with a uniform internal structure under the induction of ultraviolet light. The hydrogel obtained in the invention has excellent biocompatibility and relatively high adaptability, and is a multifunctional hydrogel with great medical potential.

The invention provides high-toughness hydrogel based on PHEMA as well as a preparation method and application of the high-toughness hydrogel, and belongs to the technical field of high polymer materials. The structure of the hydrogel is shown as a formula I, and x is 100-200; y is from 50 to 100; and z is in a range of 200 to 300. The hydrogel with a uniform cross-linked network structure and hydrogen-bond interaction is obtained by copolymerization of hydroxyethyl methylacrylate and maleic anhydride. The hydrogel has relatively high fracture toughness and can meet the requirements of being used as a substitute material for breasts and the like; meanwhile, thehydrogel has low elastic modulus, and stem cell adipogenic differentiation can be induced easily; in addition, the hydrogel is good in biocompatibility and has the effect of promoting growth of breast related cells. The hydrogel has excellent mechanical properties and biocompatibility, and can promote growth of breast related cells, so that the hydrogel can overcome the defects of existing breast substitute materials and the like, a breast substitute material with more excellent performance is prepared, and the hydrogel has a good application prospect.