170results about How to "Raw materials are non-toxic" patented technology

The invention provides a microsphere embolic agent, which is an elastic microsphere formed by the crosslink polymer of the functionalized macromolecules with the biocompatibility, and the particle size of the microsphere ranges from 1 Mum to 1500 Mum. The preparing technology includes the steps as follows: in a covalent link, linking a crosslinkable micromolecules with an acrylic acid structure on the polyvinyl alcohol, polyethylene glycol or polysaccharide macromolecules, forming the functionalized macromolecules; after that, the functionalized macromolecules and the monomer of the 2- acrylamide-2-methyl propanesulfonic acid undertakes opposite suspension polymerization, obtaining the crosslink polymeric microsphere embolic agent. The embolic agent has comparatively large retractility and elasticity, whose particle size is controllable and has perfect dispersiveness; moreover, the raw material is non-toxic and at the same time has good biocompatibility and stability. The preparing technology is a real chemosynthesis technology, whose material and preparing process does not produce any virus pollution, according with various requirements of the international embolic agent, which can replace various import and domestic expensive embolic agent products and is extensively applicable to various surgeries in the interventional radiology field.

The invention discloses a preparation method of a graphene-carbon nanotube-nano tin dioxide three-dimensional composite material, which comprises the following steps: (a) by using deionized water as a solvent, sequentially adding graphene oxide, stannous dichloride and multiwall carbon nanotubes as solutes, and mixing; (b) performing ultrasonic reaction on the mixed solution at 25-40 DEG C under the ultrasonic power of 100-300W for 1-2 hours; and (c) transferring the solution subjected to ultrasonic reaction into a hydrothermal kettle, performing hydrothermal treatment at 120-300 DEG C for 6-72 hours, and slowly cooling to room temperature, thereby obtaining the three-dimensional-structure graphene-carbon nanotube-nano tin dioxide composite material product. The invention also discloses a corresponding product and application thereof. The method disclosed by the invention can be used for preparing the three-dimensional-structure graphene composite material in an economic environment-friendly and convenient-operation mode; and the graphene-carbon nanotube-nano tin dioxide three-dimensional composite material has the characteristics of high specific surface area, porousness, light weight, long cycle life and the like.

The invention relates to a preparation technology for a microspheric embolization agent. The preparation technology is used for preparing elastic microspheres cross-linked and polymerized by functionalized macromolecules with biocompatibility, wherein the grain range of the microspheres is 1-1500mu m. The preparation technology comprises the following steps that: a cross-linkable micromolecule with a crylic acid structure is connected on a polyvinyl alcohol, polyethylene glycol or polyose macromolecule in form of a covalent bond to form a functionalized macromolecule; and reversed phase suspension polymerization is conducted to the functionalized macromolecule and a 2-acrylamide-2-methylpropanesulfonic acid monomer to prepare cross-linked and polymerized microspheric embolization agent. The embolization agent has the advantages that the flexibility and the elasticity are high, the grain is even and is controllable, the dispersity is good, the raw materials are nontoxic and the biocompatibility and the stability are good. The preparation technology is a pure chemical synthesis technology, no virus pollution is caused to the raw materials and the preparation process, the requirements on international embolization agents are satisfied, and the embolization agent can substitute for all kinds of imported or domestic expensive embolization agent products and can be widely used in surgeries in the field of interventional therapy.

The invention relates to a method for synthetizing carbamate. The method comprises the following steps: adding sulfonyl hydrazones, amine and solvents in a high-pressure kettle, adding alkali as an accelerant, introducing carbon dioxide, performing a stirring reaction for 6-72 hours at the temperature of 40-150 DEG C, cooling the high-pressure kettle to the room temperature after the reaction is completed, slowly releasing carbon dioxide which is not reacted to constant pressure, filtering a reaction liquid, decompressing and stewing the solvents to obtain crude products, and obtaining a series of carbamate chemical compounds through refining in a column chromatography. The method for synthetizing carbamate is safe and simple to operate, the prices of raw materials are low, the raw materials are easy to obtain, the adaptability for functional groups is high, the adaptability for substrates is wide, the method is environmental-friendly, industrial production is facilitated, and the method is widely applied to the synthesis of agricultural chemicals, medicines and natural products.

The invention relates to a carbon-nitrogen-oxygen combined treatment process and device. The process comprises previous cleaning, preheating, nitrocarburizing, oxidizing, waste gas treatment and later cleaning, wherein the waste gas treatment comprises the following steps: 1, introducing poisonous gas in a nitriding furnace into an oxidizing furnace for performing detoxifying treatment; 2, introducing gas in the oxidizing furnace into an absorption tower for performing spraying treatment, and achieving emission on standard. The invention also relates to a carbon-nitrogen-oxygen combined treatment device which comprises a preheating furnace, the nitriding furnace, the oxidizing furnace and a waste gas purification treatment device, wherein the nitriding furnace is communicated with the oxidizing furnace through a first fan and a first pipeline; the oxidizing furnace is communicated with the waste gas purification treatment device through a second fan and a second pipeline; gases in the nitriding furnace enter the oxidizing furnace and are purified through the waste gas purification treatment device for emission. The process and the device have the advantages of high waste gas treatment efficiency, stable process, short aging and high yield, the equipment is simple and practical, and reduction, harmlessness and reclamation in the whole technical process are realized.

The invention relates to a preparation method for super fine perovskite LaFeO3, LaMnO3 and LaNiO3 with a stearic acid gel burning method. The invention has technical proposal that (1) lanthanum nitrate and ferric nitrate and stearic acid are weighted with mol rate of 1:1:(7 to 10); lanthanum nitrate and ferric nitrate solid are smelted into the meltdown stearic acid; and the temperature is controlled by ranging from 114 DEG C to 125 DEG C for reacting for higher than 5 hours for gelling; and then the gel is arranged inside a muffle furnace having temperature range from 300 DEG C to 500 DEGC for burning so as to obtain LaFeO3 powder; (2) lanthanum nitrate, manganese chloride and stearic acid are weighted with a mol rate of 1:1:(7 to 10); lanthanum nitrate and manganese chloride solid are smelted into the meltdown stearic acid; and the temperature is controlled by ranging from 104 DEG C to 118 DEG C for reacting for higher than 6 hours for gelling; and then the gel is arranged inside a muffle furnace having temperature ranging from 300 DEG C to 500 DEGC for burning, so as to obtain LaMnO3 powder; (3) lanthanum nitrate, nickel nitrate and stearic acid are weighted with a mol rate of 1:1:(7 to 10); lanthanum nitrate and nickel nitrate solid are smelted into the meltdown stearic acid; and the temperature is controlled by ranging from 102 DEG C to 109 DEG C for reacting for higher than 6 hours for gelling; and then the gel is arranged inside a muffle furnace having temperature ranging from 300 DEG C to 500 DEGC; and the burned powder is calcined for one hour in different temperatures higher than 758 DEG C, so as to obtain LaNiO3 with different granularity sizes.

The invention relates to a titanium alloy artificial knee joint magnetorheological polishing device. The device has the characteristics that the device is high in magnetic current liquid utilization ratio, and uniform and consistent in polishing quality, and can polish a complicated curved surface, so that the device can meet the existing clinic requirement completely. A workbench is arranged at the lower part of a rack; a corresponding six-freedom-degree parallel machine tool is arranged above the workbench; a closed circulating magnetic current liquid loop is connected with a magnetic current liquid channel; the magnetic current liquid channel is placed on a support of the workbench; mounting holes of a titanium alloy prosthesis are formed below the magnetic current liquid channel; a sealing washer is mounted between the magnetic current liquid channel and the titanium alloy prosthesis; the titanium alloy prosthesis is fixed in a pressure rod; the six-freedom-degree parallel machine tool is connected with an electromagnet; the magnitude of the magnetic field intensity of a magnetic current liquid is controlled by adjusting a gap between the end face of the electromagnet and the surface of the magnetic current liquid channel, so that the magnitude of a cutting force of abrasive particles in the magnetic current liquid on the surface of a titanium alloy is controlled; and the six-freedom-degree parallel machine tool, the electromagnet and the magnetic current liquid loop are connected with a control device.

The invention provides a method for synthesizing magnesium metasilicate swinefordite by directly using salt lake saline water, which comprises: adding the soluble metasilicate into the salt lake condensed saline water, adjusting the mixing solution to make it not less than 11 with queous alkali, and adjusting the stoichiometric ratio of the magnesium, lithium and metasilicate in the mixing solution by using primary magnesium product and lithium product, then putting the mixing solution in the pressure reacting pan to react under high pressuer and high water temperature, rotary scrubbing or sucting after cooling, drying and getting the magnesium metasilicate lithium powder. The invention employs the abundant lithium, magnesium resource in the salt lake to synthesize magnesium metasilicate lithium, without the separation of magnesium and lithium, which passes the technological problem of separating magnesium and lithium, and the invention is characterized by simple process, short producing period, low cost, high product added value and suitable for industrialization; the raw material is nontoxic and harmless, there is no pollution during the whole process and no side product; the invention provides a new idea and way for comprehensive development and use of the salt lake resource.

This invention relates to a material for decorating surface of the positive of Li ionic battery and its preparation method, first of all, putting a positive powder material Li-M1M2-O(M1M2=Co Mn Ni Cr into a solution with organic substance in the concentration of 0.05-2.00mol / 1 then to put the mixed substance into a heat water reactor with mixing for 0.1-4h under 150-200deg. to spray and dry the reacted solution, then a positive material is got covered uniform carbon microspheres having the advantage of high specific capacity, fine circulation performance, uniform porosity and no impurities.

The invention discloses a mosquito repellent liquid. The mosquito repellent liquid comprises, by weight, 10 to 20 parts of bruceine, 5 to 10 parts of lightyellow sophora root, 2 to 5 parts of wild chrysanthemum, 3 to 7 parts of sesame, 4 to 9 parts of pilose asiabell root, 2 to 5 parts of poria cocos, 2 to 6 parts of cassia seed, 3 to 8 parts of smoked plum, 10 to 13 parts of areca seed, 4 to 12 parts of argy wormwood leaf, 5 to 8 parts of Chinese angelica, 1 to 5 parts of clove, 1 to 5 parts of ageratum, 2 to 7 parts of arnebia root, 10 to 20 parts of fleece-flower root, 10 to 20 parts of black sesame, 10 to 20 parts of milkvetch root, 10 to 20 parts of red sage root, 10 to 20 parts of pricklyash peel, 5 to 10 parts of tuber of stemona, 5 to 10 parts of peppermint oil, 5 to 10 parts of tea seed cake, 5 to 10 parts of lime, 5 to 10 parts of oxhide gelatin, 5 to 10 parts of black ant, 5 to 10 parts of ganoderma lucidum, 5 to 10 parts of musk, 5 to 10 parts of crocus sativus, 5 to 10 parts of sichuan lovage rhizome, 5 to 10 parts of fig leaf and 10 to 20 parts of licorice root. The mosquito repellent liquid is a pure traditional Chinese medicine external preparation, does not contain a hormone, and has a unique formula and innovativeness. The mosquito repellent liquid is prepared from the nontoxic raw materials, and has a low price, a low cost, a wide market prospect, and good economic and social benefits.

The invention discloses a magnesium-modified globular calcium-based thermochemical energy storage material and a preparation method thereof. The preparation method comprises the following steps: weighing a calcium source precursor and a stabilizer magnesium source precursor according to a certain ratio, grinding for uniform mixing, and calcining the mixture in an air atmosphere to obtain a calciumoxide and magnesium oxide mixed powder; adding an organic carbon source, performing mixing for uniformity, and carbonizing the obtained material at a constant temperature in an inert atmosphere to obtain a fluffy black solid with a carbon template; cooling the carbonized black solid to room temperature, adding a proper amount of deionized water, placing the solid and the water in an extruder, extruding out a strip-shaped solid, and processing the strip-shaped solid in a ball rolling machine to prepare spherical particles; and calcining the spherical particles in the air atmosphere to obtain the magnesium-modified globular calcium-based thermochemical energy storage material. The thermochemical energy storage material prepared in the invention has the advantages of long-term stability andefficient energy storage capacity, and the preparation method has the advantages of simplicity, easiness in operation, nontoxicity and easy large-scale obtaining of the raw materials, and strong practicability.

The invention relates to polyurethane elastic fibers with multielement functionality and a preparation method thereof. The preparation method comprises the steps of preparing a synthesized glycyrrhetic acid chitosan quaternary ammonium salt into nanoparticles; uniformly dispersing the nanoparticles into a polyurethane stock solution by adopting a slurry technology and mechanical stirring; then performing dry spinning on a spinning stock solution to obtain the polyurethane elastic fibers with multielement functionality. The polyurethane elastic fibers has the beneficial effects as follows: 1, the prepared nanoparticles are added into the polyurethane stock solution, so that the problem of poor compatibility between the glycyrrhetic acid chitosan quaternary ammonium salt and the stock solution and the negative effect on the fiber performance, caused by the problem, are solved, and the breaking strength of the fibers can be improved; 2, the nanoparticles have amphipathy, and a charge passage can be established in a fiber interface to ensure that the fibers have an effect of inhibiting generation of static electricity; 3, due to the introduction of glycyrrhetic acid, the obtained polyurethane fibers have an obvious effect of eliminating oxygen free radicals; 4, due to the introduction of quaternary ammonium groups, the antibacterial properties of the fibers are improved.

The invention provides a pure traditional Chinese medicine compound preparation for external use (such as ointment, film agent, gel and tincture), which is used for treating pruritus caused by eczema-dermatitis and mosquito biting and does not contain hormonal. The compound is prepared from resveratrol, glycyrrhizic acid or physiologically acceptable salts of glycyrrhizic acid or glycyrrhetinic acid or physiologically acceptable salts of glycyrrhetinic acid, ginghaosu and derivates thereof, menthol or borneol composition. Proved by experiments and clinical tests, the compound resveratrol anti-inflammatory and itching relieving medicament combination has the functions of resisting inflammation, restraining bacteria and relieving itching aiming at the characteristics of pruritus caused by eczema-dermatitis and mosquito biting and has specific curative effect for pruritus caused by eczema-dermatitis and mosquito biting. The invention has the advantages of nontoxic raw materials, low price and cost, wide market prospect and considerable expectant economic benefit and social benefit.

The invention relates to the in-situ compaction and antibacteria preservative treatment technology of a low mass-speed green wood, belonging to the field of wood sciences. The technology comprises the following steps of: preparing an SiO2 / wood composite material doped with nanometer Ag by using a sol-gel method; preparing nano-silver with the size of 10-100nm by using a liquid-phase chemical method; dispersing and dissolving the nano-silver into the sol prepared by mixing tetraethoxysilane, ethanol and glacial acetic acid; adding PVP and a binding agent FWT to obtain the sol with different particle diameters and concentrations of the nano-silver subjected to in-situ compaction treatment; soaking the gel for 2h through a finishing process and drying the gel to form an antibacteria preservative in-situ compact material. The wood prepared by the treatment maintains better size temperature property, greatly improves the mechanical property, and has favorable antibacteria preservative property at the same time.

A process for preparing superfine chain-shaped calcium carbonate features use of the composite form controlling agent composed of 3 assistants, and one-step carbonization reaction by intermittent bubbling. The resultant calcium carbonate has 20 nm for axial size and 11:1 for length to diameter ratio.

The invention relates to a preparation method of two-dimensional ultrathin tin sulfide nanosheets and a material prepared from the same. Sn2Cl4(Tu)5.2H2O is used as a precursor and subjected to thermal decomposition at 230 DEG C by a novel solid-liquid reaction route to synthesize the graphene-like ultrathin SnS2 nanosheets in a controllable way. The reaction temperature is controlled to obtain the pure hexagonal-phase SnS2 nanosheets, mixed-phase SnS2-SnS and pure orthorhombic-phase SnS nanosheets. The obtained hexagonal-phase SnS2 nanosheets have high mass specific capacitance (the specific capacitance is 614.6F g<-1> when the current density is 1A g<-1> and excellent stability), and are much better and the mixed-phase SnS2-SnS and pure orthorhombic-phase SnS nanosheets. The hexagonal-phase SnS2 nanosheets can be used as an active material for constructing high-performance supercapacitors.

The invention discloses dendrobium officinale flower beauty-nourishing tea which comprises the following raw materials in percent by weight: 20-40 percent of dendrobium officinale flower, 10-24 percent of chamomile, 8-14 percent of apple blossom, 6-10 percent of lemon and 30-50 percent of green tea. The dendrobium officinale flower beauty-nourishing tea is prepared by the following steps: selecting dried or fresh products, mixing the treated raw materials, directly packaging in separate bags or grinding and packaging in separate bags, sterilizing and boxing. The inherent effects of detoxifying, beautifying and nourishing skin of the raw materials are fully exerted, the effect is outstanding, the raw materials are non-toxic, safe, convenient to carry and obvious in curative effect and do not have side effects, and selection of vast women in the love of beauty and attention on daily health care can be met.

The invention relates to a synthetic method for an ethylene sulfite derivative, and belongs to the field of fine chemical synthesis. The synthetic method comprises the following steps: with titanate as a catalyst, carrying out ester exchange on dimethyl sulfite and corresponding glycol to synthesize the target compound, wherein the using amount of the catalyst is 0.01% to 2% of total weight of reactants, and the mole ratio of the used glycol to the used dimethyl sulfite is 1 to 1.2; reacting at the temperature of 80 to 150 DEG C, gradually carrying out fractionation to remove generated methylalcohol, and stopping the reaction when the methyl alcohol is not fractionated any longer; and carrying out vacuum distillation on the reaction product, and collecting the target substance. The methodhas the advantages of no corrosion, high raw material conversion rate, high yield and the like.

The invention discloses a mosquito-repellent composition and a mosquito-repellent liquid preparation method and belongs to the technical field of daily chemicals. The mosquito-repellent composition comprises the following components in parts by weight: 0.01-0.1 part of vitamin B1, 2-11 parts of mozzie buster, 1-7 parts of wormwood, 2-7 parts of night willow herb, 1-3 parts of lavender, 1-7 parts of root of lindley butterflybush, 2-5 parts of plectranthus hadiensis var. tomentosus, 1-5 parts of flores aurantii, 3-14 parts of geranium and 2-7 parts of marigold. The invention also provides the mosquito-repellent liquid preparation method which comprises the following steps: cleaning up and then drying all the plants; crushing the plants; performing extraction and concentration; mixing with vitamin B1; finally, adding ethanol, distilled water and auxiliary materials; and after that, sterilizing and packaging to obtain a mosquito-repellent liquid. The mosquito-repellent composition and the prepared mosquito-repellent liquid are safe and nontoxic, has a remarkable mosquito-repellent effect, and also has obvious economic benefits and environmental benefits.

The invention discloses a catalyzing and synthesizing method of ethyl propyl carbonate and methyl amyl carbonate, which is characterized by the following: selecting alkaline metal or alkaline metal salt or hydroxide as catalyst as well as zeolite molecular sieve or active charcoal immersed by alkaline metal or alkaline metal salt or hydroxide; adopting DEC and normal propyl alcohol as raw material; improving the transmitting rate of DMC to 100% and selectivity of ethyl propyl ester carbonate to 96.1%.

The invention discloses a foaming material for preparing a functional insole; the foaming material contains 10-98% by mass of an organosiloxane chain segment structure -(Si-O)n-, wherein 1<=n<=5000; the foaming material has an absorption peak near an infrared spectrum of 1080 cm<-1>; the interior of the foam material is a foamed pore structure; the density of the foaming material is 0.05 g / cm<3>-0.90 g / cm<3>. The functional insole is prepared by the foaming material, and all or some parts of the functional insole are prepared by the foaming material. The functional insole has an organosilicone bioinert, can be made into a high opening pore type with the opening rate of 90%, easily absorbs and discharges sweat, allows bacteria not to easily grow and reproduce, and has a good antibacterial effect by self.

The invention discloses a preparation method of polycrystalline nano cuprous oxide particles, which comprises the following steps: adding a copper source into a 98% polyol solution, and completely dissolving the copper source to obtain a precursor solution; dissolving sodium citrate or glucose in deionized water to prepare a solution, slowly adding the prepared solution into the prepared precursorsolution, and fully stirring until the solutions are uniformly mixed; transferring the prepared mixed solution into a polytetrafluoroethylene reaction liner tube, and putting the polytetrafluoroethylene reaction liner tube into a variable-frequency microwave oven; and centrifugally filtering the reaction product, washing with absolute ethyl alcohol and deionized water, and finally putting the washed sample into a vacuum drying oven to obtain the nano cuprous oxide polycrystalline powder. The method is simple in process, easy and convenient to operate, short in reaction time, low in cost consumption and environmentally friendly in raw materials, and the prepared cuprous oxide nanoparticles are of a polycrystalline structure, narrow in particle size distribution and good in stability.

The invention discloses a preparation method for fluorescent wavelength adjustable nitrogen and sulphur-co-doped carbon quantum dots, and belongs to the technical field of carbon quantum dots. The preparation method comprises the following steps: grinding and uniformly mixing L-glutamic acid and methionine in an agateware in a certain proportion; tilling the mixture at the bottom of a beaker, thenheating to 200 to 300 DEG C at a constant speed, and heating and reacting for 5 to 20 minutes in the temperature range to obtain a reaction product A; cooling the reaction product A to a room temperature; adding a passivating agent into the reaction product A, and uniformly mixing to obtain a mixed solution B; heating to enable the mixed solution B to react for 2 to 10 minutes at 200 to 300 DEG Cto obtain a mixed solution C; cooling the mixed solution C to a room temperature; performing centrifugal treatment; and standing, and dialysing through a dialysis bag to remove unreacted raw materials and impurities to obtain the nitrogen and sulphur-co-doped carbon quantum dots. The preparation process disclosed by the invention is simple and controllable; the fluorescent wavelength of the carbon quantum dots can be regulated and controlled by changing preparation conditions or the passivating agent so as to cover the wavebands of green light, yellow light and red light to meet actual application requirements.

The invention relates to a preparation method of a wavelength adjustable fluorescent carbon dot and an application of the fluorescent carbon dot in mercury ion detection and belongs to the technical field of nanomaterials. The method takes valine as a raw material and obtains a carbon dot aqueous solution with long wavelength and an adjustable fluorescence color by a hydrothermal synthesis method. The method only requires phosphoric acid for adjustment, raw materials are easy to obtain and nontoxic; special protection is not required in a production process; reaction conditions are easy to control; and the obtained carbon dot has the advantages of high productivity, high quantum efficiency, good result repeatability and the like. The method has the characteristics that the method has high productivity and low cost and facilitates mass production, and a preparation technology is simple and the like. The carbon dot prepared by the method can be used for high selectivity and high sensitivity detection of mercury ions, and a limit of detection reaches 1.5*10<-9>Mol / L.

The invention discloses a compound oxygen-increasing water purifying agent for aquaculture. The compound oxygen-increasing water purifying agent is prepared from the following raw materials in parts by weight: 13-17 parts of an oxygen-increasing agent, 2-6 parts of a pH value regulator, 3-5 parts of activated carbon, 10-18 parts of attapulgite, 20-30 parts of an ore additive, 7-9 parts of sodium carboxymethyl cellulose, 6-8 parts of chitosan, 2-4 parts of L-ascorbic acid, 2-5 parts of a curing agent and 0.5-1.5 parts of a stabilizer. The compound oxygen-increasing water purifying agent for aquaculture has the advantages of small dosage and flocculation and adsorption capability, and is capable of effectively eliminating rancidity of a remnant feed in a pond and regulating the pH value of a culture pond. In addition, dissolved oxygen in water can be effectively increased, the water quality can be improved and organic matters in the water can be absorbed and reduced. Meanwhile, the oxygen-increasing water purifying agent is nontoxic in raw materials, available in material, relatively low in production cost and simple in process, and has relatively high practical value and a good application prospect as the oxygen-increasing water purifying agent for aquaculture.

The invention discloses a photoelectric chemical battery electrode and a preparation method and application thereof. The photoelectric chemical battery electrode comprises a conductive substrate and a semiconductor thin film, and is characterized in that the semiconductor thin film is a nano-cuprous oxide thin film which contains metal copper micro particles. The electrode is prepared by directly growing the cuprous oxide thin film with the metal copper micro particles on the conductive substrate by an electrochemical deposition method. The conductive metal Cu micro particles are introduced into the Cu2O thin film, so that the conductivity of the electrode is improved; the transmission rate of electrons to the conductive substrate is increased; composition of current carriers is reduced; a short circuit current is increased; and the energy conversion efficiency of a battery is improved. Compared with the prior art, the photoelectric chemical battery electrode has the advantages that the performance of a photoelectric chemical battery assembled by the electrode is greatly improved, and the photoelectric conversion efficiency can be up to 3.13 percent at most.

The invention discloses a process for preparing an ultra-low-temperature glaze and a formula and belongs to the field of the development and application of glazes. The annealing temperature of the glaze is reduced by regulating the formula of the glaze. The process is characterized by preparing a novel low-temperature glaze by taking borax, weathered potassium-feldspar, calcium oxide and zinc oxide as raw materials. The glaze comprises the following components in percentage by mass: borax (0.3 to 0.9), weathered potassium-feldspar (0.05 to 0.35), calcium oxide (0.03 to 0.18) and zinc oxide (0.03 to 0.18). The sintering temperature can be adjusted between 700 and 1,050 DEG C by changing the content of the borax and keeping the content proportion of other components invariable. The preparation process comprises the following steps of: pre-treating a blank at first and then applying the glaze on the blank body to form a coating with the thickness of 0.3 to 0.8mm. The process and the formula have the advantages of no toxic or side effect of raw materials, low cost of raw materials, simple and practical preparation method, low sintering temperature, short temperature preservation time, great energy source conservation, high surface glossiness of the glaze and good decoration effect.

The invention discloses a mullite-based coating material for a rocket launching pad. The mullite-based coating material is prepared from mullite, cordierite, high-alumina cement and silica powder. The high-temperature combustion gas stream resistant mullite-based coating material for the rocket launching pad can protect a rocket launching pad metal structure against scouring and high-temperature ablation of high-temperature combustion gas streams, ensure reliability of working of the launching pad and prolong the service life of the launching pad. The mullite-based coating material for the rocket launching pad is applicable to high-humidity, high-salt-mist and high-ultraviolet-irradiation environments, is good in anti-corrosion performance and meets requirements for protecting the base body protection material of the rocket launching pad when the rocket launching pad is developed in coastal regions where transportation and launching are more convenient. The mullite-based coating material construction is easy and convenient. Raw materials for the mullite-based coating material are free of poison and corrosion, have the advantages of saving energy and being environmentally friendly and play an important role in improvement and protection of the environment.

The invention discloses an absorbable dura mater and a preparation method thereof. The absorbable dura mater comprises a hydrophilic layer and a hydrophobic layer, wherein a three-dimensional structure formed by crosslinking and curing acrylic acid esterification gelatin and acrylate-polyethylene glycol-N-hydroxysuccinimide ester is used as the hydrophilic layer, and a compact film formed by absorbable polyester is used as the hydrophobic layer. The absorbable dura mater can achieve tissue regeneration of a dura mater defect part, can be quickly sealed with a defect edge, has high strength, can be effectively utilize the compact hydrophobic layer to prevent cerebrospinal fluid from leaking, and can effectively utilize the hydrophilic layer to accelerate regeneration of the dura mater defect area.

The invention relates to a spray type lubricating antirust agent and a preparation method thereof, and belongs to the technical field of adjuvants for medical apparatus and instruments. The spray type lubricating antirust agent is prepared from the following raw materials in percentage by weight: 10 to 50 percent of basic oil, 10 to 60 percent of an emulsifier, 1 to 10 percent of a co-emulsifier, 2 to 60 percent of a solvent and 10 to 50 percent of a propellant. According to the spray type lubricating antirust agent, the raw materials are environmentally-friendly and readily available; the spray type lubricating antirust agent is high in drying speed, good in lubricating effect and high in water solubility and can be completely punctured by sterilization factors. The invention further provides a simple and feasible preparation method.