34results about How to "Reduce chemical toxicity" patented technology

The present invention discloses a graphene fiber and a method of manufacturing the same. The graphene fiber is manufactured by oxidizing graphite, dispersing, spinning, drying and heat treatment, and has a diameter less than 100 μm, a ratio of length to diameter greater than 10, and a ratio of carbon to oxygen greater than 5. The graphene fiber is formed of a plurality of graphene sheets, which envelop an axis and are coaxially stacked one by one from the axis. The thickness of the graphene sheet is less than 3 nm, and chemical bonds are formed to tightly bond the graphene sheets to exhibit excellent mechanical and thermally/electrically conductive properties. The method of the present invention is implemented by simple steps so as to greatly reduce poisonous chemicals possibly generated in the manufacturing environment, thereby improving the safety of manufacturing and reducing the whole processing time and cost.

The invention discloses a high-strength soluble nanoscale particle temporary plugging agent. The high-strength soluble nanoscale particle temporary plugging agent comprises, by weight, 18-30 parts of sodium chloride, 0.05-1.5 parts of dispersing agent, 0.2-0.6 part of tackifier, 10-25g of solid calcium chloride and 80-120 parts of solvent water. The high-strength soluble nanoscale particle temporary plugging agent is prepared by adding the solid calcium chloride into a mixed solution dissolved with the dispersing agent, the sodium chloride and the tackifier and performing high-speed stirring. The high-strength soluble nanoscale particle temporary plugging agent has the advantages that the temporary plugging agent uses nanoscale NaCl crystals in normal distribution in the particle size range of 0.25-22.81 micrometers as the main constraint to form an organic whole in a spatial network structure formed in natural polymer and an aqueous solution, and the temporary plugging agent is good in dispersity, good in plugging effect, suitable for making cracks and micro-seams, and the like.

The invention provides an environment-friendly non-chlorine-salt snow melting and deicing agent and a preparation method thereof, and belongs to the field of snow melting and deicing. The environment-friendly non-chlorine-salt snow melting and deicing agent is characterized by comprising the following raw materials in percentage by weight: 60-90 percent of main solvent, 2-20 percent of wetting cosolvent and 2-20 percent of corrosion inhibitor, wherein the main solvent is prepared from 60-90 percent by weight of formate and 10-40 percent by weight of sodium metasilicate; the wetting cosolvent is prepared from 40 percent by weight of sodium borate or calcium nitrate and 60 percent by weight of urea or ammonium carbonate; the corrosion inhibitor is prepared from 60 percent by weight of sodium gluconate and 40 percent by weight of zinc sulfate. According to the environment-friendly non-chlorine-salt snow melting and deicing agent, the common problems of high corrosivity, serious impact on soil structures and the like of common inorganic chlorine salt snow melting agents can be effectively solved; after being used, the environment-friendly non-chlorine-salt snow melting and deicing agent can be naturally decomposed under the natural environment, and the cost of the non-chlorine-salt snow melting and deicing agent is lower than that of other organic salt (like acetates including potassium acetate, calcium magnesium acetate and the like) snow melting and deicing agents; therefore, the environment-friendly non-chlorine-salt snow melting and deicing agent is suitable for being used in places like domestic and overseas roads, airport pavements and streets, and has wide popularization and application prospects.

The invention belongs to the field of freezing and provides a cell vitrification freezing liquid and a freezing method. The freezing liquid comprises a washing liquid, an equilibrium liquid and a vitrifying liquid. With the freezing fluid, the action time in the equilibrium liquid and the vitrifying liquid is shortened, and chemical toxicity of an osmosis protective agent is reduced. In addition,the operation is simple, and the cell survival rate is high.

The invention relates to a silsesquioxane-modified hybrid phenolic resin, and a preparation method and an application thereof, and belongs to the field of high-performance resin matrix composite materials. The silsesquioxane-modified hybrid phenolic resin provided by the embodiment of the invention is a hybrid phenolic resin cured product with a POSS molecule as a chemical crosslinking point, formed through reacting the POSS molecule represented by formula (1) with phenolic resin, and the addition of a POSS hybrid molecule strengthens nanoparticles, so the initial maximum decomposition temperature of the resin is improved to about 580 DEG C from 450 DEG C of pure resin, the residual weight is increased to about 65% from 58%, and the ablation resistance of the material is remarkably improved; and the POSS-modified hybrid phenolic resin provided by the invention has potential application prospects in the field of aerospacecraft resin-based advanced thermal protection materials.

The invention belongs to the biomedicine technical field, relating to a cell pairing and fusion chip. The cell pairing and fusion chip comprises a chip body provided with a hollow and closed cell fusion chamber, wherein a cell trap consisting of two symmetrical semilunar banks is arranged at the bottom plate of the cell fusion chamber. Each bank comprises a short end and a long end; the projecting arc surfaces of the two semilunar banks face to each other, of which the short ends form a first opening, while the long ends form a second opening; the bottom part of the semilunar bank is fixed on the bottom plate; a definite interval exists between the top part of the semilunar bank and the top plate of cell fusion chamber; and the first sampling hole corresponding to the first opening direction of the cell trap and the second sampling hole corresponding to the second opening direction of the cell trap are arranged along the diagonal direction of the cell fusion chamber. The chip with simple and ingenious structure can extremely improve cell paring rate and fusion rate, reduce the chemical poisoning effect of inducer to cell, and be operated easily.

The present invention relates to blood vessel storing liquid for fast vitrifying and cryogenically storing body blood vessel, artificial blood vessel and tissue engineering blood vessel and the corresponding storage method. The blood vessel vitrifying and storing liquid is compounded through diluting polysaccharose and mycose with M199 diluent to obtain mixed solution of 20-35 % and 15-25 % concentration separately; diluting vinyl glycol and vinyl alcohol with the mixed solution to mixed liquid of 20 % concentration; and adding azone as high penetrant in 0.5-1 % to form the blood vessel vitrifying and storing liquid, into which, 0.001-0.005 % of cationic surfactant may be also added. Blood vessel is thrown into the vitrifying and storing liquid inside some plastic bag at room temperature, and the sealed bag is thrown into liquid nitrogen for cryogenical storing. The cryogenically stored blood vessel may be defrosted via taking out the bag from liquid nitrogen and soaking in water bath at 22-25 deg.c for 15 sec.

The invention discloses a preparation method of a high-strength soluble nano-scale particle temporary plugging agent for fracturing, wherein the preparation method comprises the concrete steps of adding a calcium chloride solid into a mixed solution dissolved with a dispersant, sodium chloride and a tackifier and carrying out high-speed stirring for 0.1-1.0 h, wherein sodium chloride in the mixed solution is close to saturation, and the speed of the high-speed stirring is 200-1000 rpm. The preparation method of the temporary plugging agent is simple and easy to operate; the dispersant and xanthan gum are added to a sodium chloride solution close to the saturation and are compounded with finally added calcium chloride to prepare the temporary plugging agent; nanoscale NaCl crystals showing normal distribution in a certain range of particle size and used as a main body are bound in a space network structure formed by natural macromolecules in an aqueous solution to form an organic whole, so that the temporary plugging agent has the advantages of good dispersion and good plugging effect, and is suitable for small seams, micro seams and the like.

The invention discloses a molten salt deoxidizing method using nitrogen trifluoride as a fluorinating agent. The molten salt deoxidizing method comprises the following steps: (1) removing air and water in a reactor, wherein the reactor is filled with a molten salt; (2) heating the reactor until the molten salt is completely melted, introducing a mixed gas of nitrogen trifluoride and an inert gas,and performing a reaction for 12-72 h, wherein the volume fraction of the nitrogen trifluoride in the mixed gas of nitrogen trifluoride and the inert gas is 5-50%. The method using the nitrogen trifluoride instead of hydrogen fluoride as the fluorinating agent overcomes the defects of poor safety, severe corrosion and short service life of a the reactor, complexity in operation and high cost in the prior art; and the nitrogen trifluoride has a low chemical toxicity, and has stable properties at room temperature.

The invention relates to the technical field of poultry feed and in particular relates to fattening feed for fattening adult sheep of a high-density livestock farm. The feed is prepared from coarse feed, concentrated feed and an additive; specifically, the coarse feed is prepared from sweet potato leaves, sorghum sudanense, alfalfa, trifolium repens and festuca arundinacea; the concentrated feed is prepared from millet, wheat bran, konjac flour and potato powder; the feed additive is prepared from an adaptive-period additive, a transitional-period additive and a fattening-period additive. The fattening feed provided by the invention is specially designed according to growth habits and various functions of the adult sheep; the fattening feed has a balanced nutrient proportion and a good fattening effect; the reward of the feed is high and the fattening time of the adult sheep can be remarkably shortened.

The invention relates to a high silica fiber reinforced reactive silsesquioxane modified hybrid phenolic composite material and a preparation method thereof. Hybrid phenolic resin is prepared from POSS modified phenolic resin with a silicon hydroxyl structure, high silica fiber is impregnated with the hybrid phenolic resin to prepare a prepreg, and the fiber reinforced composite material is prepared through hot press molding. POSS and phenolic resin are subjected to a cross-linking reaction, and introduction of POSS hybrid molecules plays a role in nanoparticle reinforcement. The mass loss ofthe hybrid resin is 5%, the temperature is increased to 385.5 DEG C from 306.6 DEG C, and the heat resistance of the material is improved. The linear ablation rate of the fiber reinforced composite material is reduced from 0.191 mm/s to 0.163 mm/s, the mass ablation rate is reduced from 0.0703 g/s to 0.0643 g/s, and the ablation resistance of the material is remarkably improved. The high silica fiber reinforced POSS modified phenolic resin-based composite material provided by the invention has a wide application prospect in the fields of aerospace craft resin-based advanced thermal protectionmaterials and engine exhaust nozzle thermal insulation materials.

The invention provides a method for separating uranium and neptunium through a fluorinated volatilization technology. The method comprises the following steps that (1), air and water in a reactor are removed, the reactor is filled with a mixture A or a mixture B, the mixture A comprises a substance containing uranium elements and neptunium elements, the mixture B comprises a substance containing uranium elements, a substance containing neptunium elements and fused salt, the substance containing uranium elements comprises uranium elementary substance and/or uranium compound; and the substance containing neptunium elements is neptunium elementary substance and/or neptunium compound; (2), reaction products containing uranium elements are recycled; and (3) the residual product after the uranium elements are recycled is cooled to 350-600 DEG C, mixed gas of fluorine gas and inert gas is introduced, a reaction product containing neptunium elements is recycled; and the reaction temperature in the step 2 is higher than that in the step 3. The method has the advantages that the reaction speed is high, the conversion rate of uranium and neptunium is large, the separation efficiency of uranium and neptunium is high, side reactions are few, the separation selectivity is good, and serialization is easy.