85 results about "Hydroxylapatite" patented technology

Disclosed is a method for preparing a heterogeneous metal composite structure for medical implantation, including the steps of: step 1, preparing titanium alloy powder into a porous skeleton according to different printing strategies; step 2, filling magnesium after being melted into pores of the porous skeleton; and step 3, cooling a titanium-magnesium interpenetrating phase composite structure prepared in step 2 to room temperature, and covering a surface of the titanium-magnesium interpenetrating phase composite structure with a hydroxyapatite coating. In the present disclosure, a porous lattice dot-array structure of titanium alloy is used as a skeleton, and the skeleton pore is filled by pressureless infiltration of magnesium or hot isostatic pressure.

The invention discloses a crosslinked polyethylene insulated flame-retardant power cable, which sequentially comprises a cable core, a shielding layer, an inner sheath layer, an armor layer and an outer sheath layer from inside to outside, and is characterized in that the inner sheath layer or the outer sheath layer is obtained by respectively extruding a sheath material on the outer side of the shielding layer or the armor layer; the sheath material is prepared from the following raw materials: low-density polyethylene, high-density polyethylene, phosphate modified yttrium-graphene nano porous particles, hydroxyapatite porous nanorods, a cross-linking agent, an assistant cross-linking agent, an antioxidant and the like. The obtained power cable has excellent insulativity and flame retardance and has a good application prospect in the field of high-voltage power transmission.

The invention provides a microporous cathode electrochemical induced crystallization precipitation system and application thereof.The system comprises an anode chamber and a cathode chamber, an anode plate is a Ru / Ir mesh electrode, and a cathode plate is a stainless steel mesh cathode with the high mesh number of 100-300 meshs.According to the microporous cathode electrochemical induced crystallization precipitation system, the mesh cathode with the high mesh number is used for replacing a traditional anion exchange membrane; the high-mesh-number net-shaped cathode prevents hydrogen ions generated by the anode from migrating to the cathode chamber, the high-pH environment of the cathode chamber is guaranteed, the pH of the cathode chamber reaches up to 10.90, the phosphorus recovery efficiency reaches 93.14%, meanwhile, the cost is greatly reduced and is only 1.25% of that of an ion exchange membrane, needle-shaped nano-hydroxyapatite serves as an additional seed crystal, the needle-shaped nano-hydroxyapatite (ANHD) is put into the cathode chamber, and the yield of phosphorus is greatly increased. The seed crystal effect of ANHD is fully exerted, and the recovery efficiency of orthophosphorus is improved by 24.40%.

The invention provides a method for solidifying heavy metal ions in lithium slag, and belongs to the technical field of solidified lithium slag treatment. The method for solidifying the heavy metal ions in the lithium slag comprises the steps that lithium slag powder is taken as a base material, sodium fluoride, silicon carbide, sodium tetraborate and hydroxyapatite are added into the base material for dry mixing, and mixed powder is obtained; adding deionized water into the mixed powder to prepare a spherical green body; drying the spherical green body to obtain a dried green body; and sintering the dried green body, and cooling to room temperature to obtain the cured lithium slag ceramsite. According to the method, pollution-free treatment of the lithium slag is achieved, meanwhile, the treatment process is simplified, environmental damage is reduced, and resource utilization of the lithium slag is improved.

The invention discloses an antibacterial bioactive glass composite material for skull defect repair and a preparation method thereof, and relates to the technical field of bioactive glass materials. The antibacterial bioactive glass composite material for skull defect repair is prepared from the following raw materials in parts by weight: 8 to 15 parts of collagen, 45 to 55 parts of bioactive glass, 20 to 30 parts of hydroxyapatite, 5 to 8 parts of a toughening agent, 1 to 2 parts of an antibacterial agent and 150 to 250 parts of deionized water. The antibacterial bioactive glass composite material for skull defect repair prepared by the invention has excellent bending strength and antibacterial property.

The invention relates to a silicon-doped hydroxyapatite (at) MnO2 composite material and a preparation method and application thereof.The preparation method comprises the following steps that a permanganate solution is added into a silicon-doped hydroxyapatite suspension for a reaction, and the mass ratio of silicon-doped hydroxyapatite to permanganate is (5-8.75): (0.01-0.024); and after the reaction is finished, carrying out post-treatment to obtain the silicon-doped hydroxyapatite (at) MnO2 composite material. According to the preparation method, the permanganate solution is doped into the silicon-doped hydroxyapatite suspension for reaction, the permanganate solution can be decomposed and grow on the silicon-doped hydroxyapatite, a core-shell structure with the silicon-doped hydroxyapatite as a core and MnO2 as a shell is formed, and the obtained silicon-doped hydroxyapatite and MnO2 composite material is uniform in morphology, high in specific surface area and high in specific surface area. And a uniform shell layer is formed by controlling the dosage ratio of the permanganate to the silicon-doped hydroxyapatite, so that low cytotoxicity or even no cytotoxicity is ensured, and remarkable thermal response performance is achieved.

The invention belongs to the field of nano materials, and discloses a hydroxyapatite whisker / chitin whisker co-assembled liquid crystal as well as a preparation method and application thereof. The co-assembled liquid crystal is obtained by mixing hydroxyapatite whisker liquid crystal and chitin whisker liquid crystal which have the same electrical property, performing ultrasonic homogenization treatment and further stabilizing at room temperature. In a co-assembled liquid crystal system, the preparation and long-term stability of the co-assembled liquid crystal system are realized by two whiskers with the same electrical property based on a dual-drive principle of electrostatic repulsion and spatial orientation entropy; and the co-assembled liquid crystal simulates the liquid crystal phase and the ordered organic / inorganic phase composition in the living body in the nature in the organic / inorganic phase composition and the liquid crystal state. In addition, the adopted raw materials are wide in source and low in cost, the preparation process is simple, efficient and easy to implement, and no surfactant or dispersing agent is needed to stabilize the co-assembled liquid crystal system.

The present disclosure provides a method for solidifying heavy metal ions in lithium slag, belonging to the technical field of lithium slag treatment. The method for solidifying heavy metal ions in lithium slag comprises: taking lithium slag powder as a base material, adding sodium fluoride, silicon carbide, sodium tetraborate and hydroxyapatite to the base material for dry mixing to obtain a mixed powder; adding deionized water to the mixed powder to prepare a spherical green body; drying the spherical green body to obtain a dry green body; and performing sintering treatment on the dry green body, and cooling to room temperature to obtain solidified lithium slag ceramsite. The method realizes nuisance-free treatment of lithium slag, simplifies the treatment process, reduces environmental damage, and improves the resource utilization of lithium slag.

This invention discloses a method for depositing hydroxyapatite in a three-dimensional porous sample, comprising: S1, pretreatment of the three-dimensional porous sample; S2, placing the three-dimensional porous sample in an O... 2 In a plasma spraying apparatus; S3, prepare SBF1, immerse the sample treated in step S2 into SBF1, seal the container tightly, and place it in an incubator. After immersion in SBF1, remove the sample, wash and dry it. SBF1 contains the following components: CaCl2, MgCl2·6H2O, NaHCO3, K2HPO4·3H2O, Na2SO4, KCl, and NaCl; S4, prepare SBF2, immerse the sample treated in step S3 into SBF2, seal the container tightly, and place it in an incubator at 37°C. SBF2 contains the following components: NaCl, CaCl2, and K2HPO4·3H2O; S5, remove the sample, wash and dry it to obtain a three-dimensional porous sample with deposited hydroxyapatite. The method provided by this invention uniformly deposits HA in the porous three-dimensional void surface, and the composite interface can accelerate early bone healing, increase the integration of the bone implant surface with the bone, and promote the early stability of the implant.

Provided herein are chromatography media comprising a porous solid substrate (such as a membrane, a metal, or a metal alloy) coated with hydroxyapatite (HA). Also provided are chromatography media comprising the HA coated substrate, and uses thereof. Thus, the present disclosure provides chromatographic media comprising a porous solid substrate coated with HA, such as a membrane, metal, or metal alloy. Also provided are chromatography media comprising the HA coated substrate, and uses thereof. A method of preparing the HA coated substrate is also provided.

A chewable tablet a first probiotic strain of bacteria that inhibits Streptococcus mutans; a second probiotic strain of bacteria that inhibits one or more of Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia (i.e., the red complex); a remineralizing agent such as hydroxyapatite with a micron-level particle size; and a sugar alcohol such as xylitol.

The invention discloses a modified current collector and a preparation method thereof, a negative pole piece and a battery, a fluorinated hydroxyapatite nano modified layer is constructed on the surface of a current collector conducting layer to form the modified current collector, and the modified layer is located on the surface of the current collector conducting layer, so that an electrolyte-negative electrode interface can be stabilized, and the cycle performance of the battery is improved; and the protective layer can be used as an anti-oxidation protective layer on the surface of the current collector conductive layer to prevent the current collector conductive layer from being oxidized. The invention can improve the cycle performance of the battery and prolong the cycle life of the battery.

The invention aims to provide a fully degradable full polylactic acid-based optical fiber pressure sensor, which comprises a base, a pressure-sensitive diaphragm and an optical fiber, and is characterized in that the base is a blend of polylactic acid and nano cellulose; the pressure-sensitive membrane is a blend of polylactic acid, nano cellulose and hydroxyapatite; the optical fiber core layer is made of high-purity polylactic acid, the cladding layer is made of a polylactic acid and polyhydroxyalkanoate blend, all components are made of polylactic acid degradable materials, secondary operation is avoided, performance and degradation balance is achieved through blending modification, the components are good in degradation synchronism, and therefore the stability of the sensor is guaranteed.

The application discloses an integrated hydroxyapatite photodisruption device based on vortex vector light field regulation technology, which utilizes vortex vector light field regulation technology and vector diffraction theory principles to realize efficient decomposition of hydroxyapatite in emergency, meets high requirements for speed and precision in surgery, avoids sample heating, and reduces operation complexity and danger. Compared with the prior art, the device is small in size, convenient to flexibly use in medical and cosmetic surgery, fills the blank in the key field, and adopts integrated optical technology to ensure the precision and stability of the system, and is suitable for large-scale application.

The invention provides a preparation method of high-purity hydroxyapatite dry powder. The preparation method comprises the following steps: mixing a hydroxyapatite precursor containing an impurity crystal phase with water to form a precursor solution; putting the precursor solution into a ball mill, grinding and dispersing to form slurry, putting the ground and dispersed slurry into a spray dryer, and crushing the slurry into hydroxyapatite particles and impurity crystal phase particles under the action of high-pressure airflow of the spray dryer; the hydroxyapatite particles and the impurity crystal phase particles are agglomerated in the falling process to form hydroxyapatite agglomerates and impurity crystal phase agglomerates with different particle sizes, and due to different particle sizes, the hydroxyapatite agglomerates and the impurity crystal phase agglomerates are separated, so that the high-purity hydroxyapatite dry powder is prepared; according to the method, impurity crystal phases can be removed, the product can be dried, and the high-purity hydroxyapatite dry powder is obtained and is convenient to store and apply.

The invention provides sunscreen composite powder with an antibacterial function, the powder is characterized in that g-C3N4 and iron-silver co-doped hydroxyapatite are compounded, the chemical composition expression of the powder is g-C3N4 / (Ca10-x-yFexAgy) (PO4) 6 (OH) 2, x is more than or equal to 0.1 and less than or equal to 1, y is more than or equal to 0.1 and less than or equal to 1, and the mass ratio of g-C3N4 in the composite powder is 20%-40% of the total mass. Part of Ca < 2 + > in crystal lattices of the iron-silver co-doped hydroxyapatite is respectively substituted by Fe < 3 + > and Ag < + >. The composite powder has a strong absorption effect on light in the wavelength range of 220-430 nm, and particularly after the g-C3N4 is compounded, the light absorption of the modified hydroxyapatite in the wavelength range of 310-430 nm is reinforced. The composite material has a good antibacterial effect on staphylococcus aureus and escherichia coli, and the color of the composite powder is close to the natural skin color of Asian people.

The invention relates to the technical field of ultraviolet shielding materials, in particular to a preparation method of a dealkalized lignin / cerium-doped hydroxyapatite two-dimensional nanosheet composite material and ultraviolet shielding application of the dealkalized lignin / cerium-doped hydroxyapatite two-dimensional nanosheet composite material. The method comprises the following steps: firstly, preparing a dealkalized lignin nanosheet through ultrasonic treatment and freeze drying, then mixing cerous nitrate, calcium chloride and disodium hydrogen phosphate powder with water to prepare a solution, and then uniformly mixing the dealkalized lignin powder with the mixed solution for microwave hydrothermal reaction; the dealkalized lignin / cerium-doped hydroxyapatite two-dimensional nanosheet composite material is obtained through centrifugation and freeze drying, a band gap with good ultraviolet absorption is obtained, the dealkalized lignin / cerium-doped hydroxyapatite two-dimensional nanosheet composite material is applied to ultraviolet shielding, the good biocompatibility of hydroxyapatite is considered, and the ultraviolet shielding effect is also provided. The large flaky hydroxyapatite nanosheets are prepared by virtue of the template effect of the dealkalized lignin, so that the agglomeration of the dealkalized lignin nanosheets is effectively inhibited, and the anti-ultraviolet effect of the dealkalized lignin / cerium-doped hydroxyapatite two-dimensional composite material is synergistically improved.

The invention discloses self-cleaning titanium dioxide and a preparation method, the titanium dioxide sequentially comprises a titanium dioxide substrate, an inorganic coating layer and an organic coating layer from inside to outside; the inorganic film coating layer comprises an Al-doped hydroxyapatite film layer; the organic coating layer is obtained by performing organic modification by adopting organic acid. According to the preparation method, the Al-doped hydroxyapatite inorganic coating and the organic acid organic coating are comprehensively adopted for modification, so that the surface energy of the titanium dioxide is remarkably reduced, the contact angle is increased, and the self-cleaning capability of the titanium dioxide is improved. Meanwhile, the titanium dioxide provided by the invention also has excellent weather resistance, dispersibility and other pigment properties, and can meet the needs of self-cleaning products.

The present invention provides a treatment process for the synergistic sterilization and disinfection of industrial wastewater using chlorine dioxide, ozone and ultraviolet rays, which belongs to the field of water treatment technology and comprises the following steps: 1. filtering the industrial wastewater and performing preliminary precipitation; 2. transporting it to a biological contact oxidation tank, and transporting it to an inclined tube sedimentation tank after treatment for precipitation; 3. transporting it to a disinfection tank, injecting ozone, and irradiating it with an ultraviolet lamp at the same time; 4. transporting it to a purification tank, adding chlorine dioxide, and performing desalination treatment by a reverse osmosis composite membrane to finally obtain purified water. The present invention provides a treatment process for the synergistic sterilization and disinfection of industrial wastewater using chlorine dioxide, ozone and ultraviolet rays, which can effectively reduce the adverse effects of chlorine on the reverse osmosis composite membrane, and the reverse osmosis composite membrane is obtained by coating a hydroxyapatite-doped support layer with a carbon nanotube-modified polyaryl sulfide sulfone solution, and has good permeability and long-term stability.

The invention relates to the technical field of agricultural fertilizers, and discloses a compound fertilizer based on bioactive hydroxyapatite superfine powder and a preparation method thereof. According to the fertilizer, animal bone-derived hydroxyapatite superfine powder is taken as a core and is subjected to compound activation through zeolite, organic silicon and titanium dioxide, and multifunctional activated powder with a core-shell structure is formed. Then compounding the activated powder with algal polysaccharides, polyglutamic acid and trace elements containing zinc, boron and molybdenum under the action of a dispersing agent, and preparing a stable concentrated suspension through a high-pressure homogenization process; or further mixing with a bentonite carrier, and preparing into a granular fertilizer through a granulation process. Through an innovative composite activation process, efficient slow release and utilization of nutrients are realized, the fertilizer is endowed with multiple functions of degrading pesticide residues, passivating heavy metals and inhibiting pathogenic bacteria, and the fertilizer is cooperated with biostimulant, so that the yield and stress resistance of crops are remarkably improved.

The invention discloses a preparation method of high-purity superfine high-whiteness calcium carbonate, which belongs to the field of calcium carbonate preparation, and comprises the following steps: pretreating multiple raw materials such as dolomite, steel slag and the like, adding a composite sintering aid, calcining at 700-900 DEG C, and recovering and purifying carbon dioxide; carrying out ultrasonic-assisted leaching on the calcined product, reacting with magnesium chloride, and separating to obtain a high-purity calcium chloride solution; carrying out deep impurity removal on the impurity-containing magnesium hydroxide by using a composite chelating agent, introducing carbon dioxide to obtain a magnesium ion leaching solution, and regulating and crystallizing by using a biological template to obtain magnesium carbonate trihydrate; reacting with a calcium chloride solution under the action of a reducing agent, treating a product with a composite surface modifier, and spray-drying to obtain a product; according to the method, a composite chelating agent (EDTA disodium + nano-hydroxyapatite) + reduction synergistic purification (sodium sulfite + ascorbic acid) system is adopted, colored impurity ions such as Fe < 3 + > and Mn < 2 + > are removed in a targeted mode, the problem that traditional magnesium hydroxide is not thoroughly adsorbed is solved, and the whiteness of the product is improved.

The invention relates to the technical field of odorless environment-friendly asphalt materials, and discloses bionic odorless environment-friendly asphalt and a preparation method thereof. The asphalt material comprises matrix asphalt, an SBS modifier, bionic smoke control particles, thermal response microspheres containing a stabilizer and polyvinylidene fluoride. The bionic smoke control particle is of a shell-middle layer-inner core three-layer structure, the shell is formed by compounding chitosan and hydroxyapatite, the middle layer is a thermoplastic polymer, and the inner core is sulfydryl functional silica gel and foam silicate. The total volatile organic compound release amount is reduced by 51% compared with that of a pure 70 # matrix asphalt sample, and the total release reduction rate reaches 53.6%. Under irradiation for 30 minutes, the surface temperature is increased to 38.0 DEG C and is reduced by 20.2 DEG C compared with a pure 70 # matrix asphalt sample, and the heating rate is reduced by more than 60%. The asphalt is suitable for asphalt material application scenes needing smoke control and heat regulation such as roads and roofs.

The invention discloses a selenium-iron co-doped hydroxyapatite reinforced polylactic acid scaffold and a preparation method thereof, and the preparation method comprises the following steps: co-doping SeO3 < 2-> and Fe < 3 + > into HAP through a co-precipitation method to obtain SF-HAP powder; sF-HAP and PLLA are dispersed in ethyl alcohol, and PLLA / SF-HAP composite powder is obtained through stirring, centrifuging, drying and the like; the PLLA / SF-HAP biological scaffold is prepared through an additive manufacturing technology, in order to endow the PLLA / HAP bone scaffold with an anti-tumor function, Fe is doped into HAP, a Fenton reaction can be promoted in an osteosarcoma environment so that ROS can be generated to kill tumor cells, but overexpressed GSH existing in the tumor cells can consume the ROS to weaken the anti-tumor effect, and doping of Se and Fe can reduce the crystallinity of HAP crystals, so that the anti-tumor effect is improved. The SeO3 < 2-> and the Fe < 3 + > are added into the tumor cells, so that the sustained release of functional ions is facilitated, meanwhile, the consumption of the SeO3 < 2-> and the Fe < 3 + > on the over-expressed GSH and H2O2 in the tumor cells can effectively destroy the redox balance in the tumor cells, and the death of the tumor cells is promoted.

The invention relates to the technical field of concrete preparation, in particular to an environment-friendly recycled concrete preparation process which comprises the following components: recycled concrete aggregate, a hydroxyapatite-graphene composite material, rice hull ash, recycled plastic particles, fly ash, slag powder, Portland cement, medium sand, a water reducing agent and water. By selecting the recycled aggregate, introducing the high-performance additive and the novel composite material and optimizing the preparation process, the invention aims to prepare the recycled concrete with excellent mechanical properties, good durability and environmental protection performance, and the novel recycled concrete not only has wide market application prospects, but also has wide application prospects. And powerful technical support can be provided for green transformation of the building industry.

The invention relates to a method in which xylitol is heated until liquified, to be added to hydroxyapatite and zinc citrate, the mixture subsequently being subjected to a process of controlled crystallisation. This produces crystals for dental care with active agents that maximise the bioactive effect of same in the mouth, the crystals also providing slow and controlled release of the active agents, thereby increasing effectiveness in comparison with conventional forms of application. In summary, the invention represents a significant advance in dental care technology. It not only improves the therapeutic efficacy of the hydroxyapatite and zinc citrate through innovative release technology, but also increases patient acceptance and environmental sustainability.

The invention provides a g-C3N5 modified nano-hydroxyapatite material as well as a preparation method and application thereof, and relates to the technical field of photocatalytic materials as well as preparation and application thereof. The material is composed of nano-hydroxyapatite and g-C3N5, the nano-hydroxyapatite is a photocatalytic material matrix, and the g-C3N5 is a modifier. The preparation process can be completed by only adopting one-step calcination, the preparation steps are extremely simple, and the cost is low. The efficient visible light response performance of the g-C3N5 overcomes the defect that the nano-hydroxyapatite only responds to ultraviolet light, electron-hole pairs can be excited under visible light, meanwhile, the positions of a conduction band and a valence band of the g-C3N5 and the positions of a conduction band and a valence band of the nano-hydroxyapatite can be staggered, transmission of excited electrons is facilitated, the recombination probability is reduced, and the photoelectric conversion efficiency is improved. Therefore, the photocatalytic activity is improved. The g-C3N5 modified nano hydroxyapatite material has a relatively good photodegradation property on various colored dyes.

The application discloses a kind of alpha type high-strength gypsum and preparation method thereof, belong to alpha type high-strength gypsum preparation technical field, the preparation method of alpha type high-strength gypsum includes the following steps: after hydrothermal reaction treatment, gypsum raw material and crystal modifier are obtained;According to the percentage of the dry basis mass of gypsum raw material, the crystal modifier includes the following preparation raw materials: 0.03%~0.40% maleic acid-acrylic acid copolymer sodium salt, 0.05%~1.2% complexing agent, 0.01%~0.5% polycarboxylate superplasticizer, 0.01%~0.25% potassium chloride and 0.02%~0.8% hydroxyapatite micro powder.The crystal modifier of the application can accurately control the whole process of crystal growth and adapt to low-purity mixed gypsum raw material, so that the product crystal is short columnar and the aspect ratio is stable, and finally the alpha gypsum with high strength is obtained.

The present invention is directed to a cosmetic sunscreen composition comprising (a) at least one organic UV filter; (b) at least one polymer; (c) at least one surfactant; and (d) hydroxyapatite. The invention is also related to the use of hydroxyapatite for improving the SPF on cosmetic sunscreen compositions and the use of said cosmetic sunscreen composition.

The invention discloses an XPS flame-retardant master batch and a preparation method thereof, and belongs to the technical field of XPS flame-retardant master batches, the preparation method comprises the following steps: preparing a composite flame retardant, preparing a composite adsorbent, and granulating; the preparation of the composite flame retardant comprises the following steps: coating hydroxyapatite, cross-linking, and carrying out primary hydrophobization; the preparation of the composite adsorbent comprises the following steps: intercalation and secondary hydrophobization; the XPS flame-retardant master batch prepared by the invention has excellent flame retardance, generates less hydrogen bromide gas during processing and combustion, is low in fuming amount, and also has excellent moisture resistance, ageing resistance and mechanical properties, and an XPS material prepared from the XPS flame-retardant master batch also has excellent heat preservation and heat insulation properties.