127results about How to "Good non-toxic" patented technology

The invention discloses a graphene oxide/polymer composite antibacterial material and a preparation method thereof. The composite antibacterial material is characterized in that a polymer is subjected to surface modification and then is combined with graphene oxide dispersed in water, thus obtaining a graphene oxide antibacterial coating bonded on a polymer matrix, wherein the thickness of the antibacterial coating is 1 to 50nm. The preparation method of the graphene oxide/polymer composite antibacterial material comprises the following steps: firstly, performing ultrasonic cleaning on the polymer; secondly, performing surface modification on the polymer subjected to ultrasonic cleaning; thirdly, immersing an activated polymer matrix into a coupling agent solution and soaking; fourthly, taking out the soaked polymer, leaching with deionized water, then putting into a graphene oxide suspension liquid for 0.2 to 24 hours, taking out, leaching and naturally drying in air to obtain the graphene oxide/polymer composite antibacterial material. The invention designs and prepares the composite antibacterial material by taking graphene oxide as an antibacterial ingredient; the composite antibacterial material has a transparent antibacterial layer, is excellent in antibacterial property and is firmly bonded with the matrix.

The invention discloses self-setting calcium phosphate micro spheres, a method for preparing the same and application thereof. The preparation method comprises the following steps of: mixing glutin and deionized water to obtain solution of glutin; mixing polysaccharide gum and deionized water to obtain solution of polysaccharide gum; mixing completely dissolved solution of glutin and solution of polysaccharide gum to obtain solution of glutin/polysaccharide gum; fully mixing the solution of glutin/polysaccharide gum and calcium phosphate cement by stirring to obtain pasty self-setting calciumphosphate slurry, fully dispersing the self-setting calcium phosphate slurry into soybean oil by stirring, removing the soybean oil by filtration, and repeatedly washing the micro spheres by acetone and alcohol to obtain the wet micro spheres; and performing curing hydration and drying of the wet micro spheres to obtain the self-setting calcium phosphate micro spheres. The method has the advantages that: the sintering treatment of the micro spheres is unnecessary, medicaments, growth factors or other active (functional) components can be synchronously loaded in the preparation process, the grain size of the obtained self-setting calcium phosphate micro spheres is 0.12 to 2.61mm, and the obtained self-setting calcium phosphate micro spheres are not disintegrated in 6 to 32 hours.

The invention relates to a nuclear power 1E-grade K3-class heat-shrinkable tubing material and preparation thereof. The nuclear power 1E-grade K3-class heat-shrinkable tubing material of the invention comprises the following components by weight: 20-50 parts of polyolefin resin; 40-50 parts of a halogen-free flame retardant; 2-3 parts of an antiager; 15-20 parts of a flexibilizer; 1.5-2 parts of an anti-oxidant; 1-5 parts of a modifier; and 3-10 parts of a plastic processing additive. The material of the invention is prepared by selecting raw materials of the substrate resin, the halogen-free flame retardant, the antiager, the flexibilizer, the anti-oxidant, the modifier, and a crosslinking sensitizing agent according to certain ratios and through a series of process steps; the obtained nuclear power 1E-grade K3-class heat-shrinkable tubing material has relatively balanced and excellent mechanical properties, low-smoke performance, non-toxic performance, flame retardation, heat resistance, irradiation resistance, and the like, and especially has excellent heat resistance and irradiation resistance. The nuclear power 1E-grade K3-class heat-shrinkable tubing material is widely applicable to the nuclear power station field.

The invention relates to an extracorporal building method of a tumor microenvironment and an application of the method. By using the method, a three-dimensional stent similar with a cell internal microenvironment is built and total cells of tumor tissues are inoculated to promote recovery of physiological activity of all cells, so that a tumor microenvironment is built for drug screening for individual-based tumor treatment.

A related soft high-specific-gravity rubber-plastic foam material for insulating sound and reducing noise consists of the following components in percent by weight: 15%-45% of rubber, 5%-20% of plastic, 10%-30% of a heavy metal powder, 3%-10% of a plasticizer, 1%-5% of a stabilizer, 1%-10% of a foaming agent, 1%-5% of a sulfurizing agent, 1%-2% of an accelerator and 1%-7% of a coupling agent. Compared with the prior art, the soft high-specific-gravity rubber-plastic foam material possesses good elasticity of rubber and good glutinousness of plastic, also possesses relatively high surface density demanded by sound-proof mass action law and additional action of "foam damping", avoids the sound-proof low ebb of a conventional sound-proof material under the effect of resonant frequency and a coincident effect, and is extremely suitable for quality improvement of all kinds of sound environments and noise-controlling places.

The invention discloses a high-strength wear-proof composite material which is prepared from a metal base body, a copper powder layer and a plastic layer. The metal base body and the copper powder layer are sintered at the high temperature to form a copper powder plate. The plastic layer is embedded into the copper powder layer, so that the metal base body and the plastic layer are tightly combined together. The plastic layer is prepared from, by mass, 55-70% of polyether-ether-ketone (PEEK), 10-15% of polytetrafluoroethylene (PTFE), 15-30% of polyimide (PI) and 1-2% of graphite. The invention further discloses a preparation method of the composite material. The high-strength wear-proof composite material has the advantages of being high in strength, resistant to impact and wear, free of pollution, environmentally friendly and nontoxic.

The invention relates to a preparation method of an organic pigment, in particular to a preparation method of a low-arsenicred iron oxide pigment. the method produces a low-arsenicred iron oxide pigment by a two-step oxidation liquid-phase production method and does not use sheet iron in two-step oxidation, thereby reducing the consumption of sheet iron resources and obtaining iron red with better fineness and dispersion than those of iron red produced by a sheet iron mixed acid method. Because the sheet iron is not used in the two-step oxidation, the contents of heavy metals, such as arsenic, lead, and the like can be effectively controlled. The low-arsenicred iron oxide pigment prepared by the method contains As not more than 5 mg/kg and Pb not more than 10 mg/kg. The invention can be widely applied to industries, such as pencils, toys, cosmetics, medicine, tipping paper, and the like.

The invention discloses a chitosan-based self-assembled nano micelle solution loaded with beta-carotene and a preparation method thereof. An imidazoles ionic liquid is used as an effective solvent of chitosan, and under the action of a catalyst, lactide is subjected to ring opening polymerization and is grafted to a chitosan macromolecular chain to obtain a chitosan-grafted polylactic acid; then a self assembly action of the chitosan-grafted polylactic acid in an aqueous solution is utilized to achieve effective embedding of hydrophobic beta-carotene. The water solubility and the oxidation resistance of beta-carotene can be effectively improved, moreover, the preparation process is simple, and conditions are mild; and the prepared nano micelle solution has good stability, and is expected to provide a natural and effective stable carrier and a water-phase dispersant for the cosmetic field or the functional food field.

A heat-resistant shielded power cable for nuclear power stations comprises a combined cable core, three power cable cores are stranded to form the combined cable core, filler is arranged on the combined cable core, the periphery of the filler is sequentially wrapped by an isolating layer, a composite shielding layer, a flame-retardant tape, an oxygen barrier and an outer sheath, the filler is a low-smoke halogen-free flame-retardant polyolefin material, a polyester film is lapped to form the isolating layer, tinned copper wires are woven and lapped to form the inner layer of the composite shielding layer, an aluminium-plastic composite tape is overlapped to form the outer layer of the composite shielding layer, a glass fiber tape is lapped to form the flame-retardant tape, irradiation cross-linked low-smoke halogen-free flame-retardant polyethylene is extruded to form the wrapping oxygen barrier, and the outer sheath is made of ceramic fire-resistant silicon rubber; the three power cable cores respectively consist of a cable core conductor, an liner layer and an insulating layer which are arranged sequentially from the inside to the outside, wherein a synthetic mica tape is lappedto form the liner layer, and heat-resistant silicon rubber is extruded to form the insulating layer, and is then vulcanized. The heat-resistant shielded power cable has excellent heat resistance, shielding property and electric insulativity.

The invention discloses an enamel wok with patterns on the outer surface. The enamel wok comprises a lid and a cast iron enamel wok body. The cast iron enamel wok body is composed of a cast iron blank and a high-temperature glaze material acting on the outer surface of the cast iron blank. The cast iron blank contains carbon, silicon, manganese, phosphorus, sulfur, chromium, molybdenum, vanadium, boron and the balance iron. The glaze material contains cordierite, zircon, kaolin, potassium feldspar, quartz stone, mullite, calcined talc, zinc fluoride, nanometer titania and cerium dioxide. The formula of the glaze material of the produced wok is unique, the patterns rich in beauty can be produced on the outer surface of the wok, and the ornamental value of the wok is increased.

The invention provides novel pH-response composite hydrogel containing rare earth complex and a preparation method and application of the novel pH-response composite hydrogel. The novel pH-response composite hydrogel containing the rare earth complex is in a shape similar to a sphere, and the particle diameter is 3-5mm. The novel pH-response composite hydrogel containing the rare earth complex is prepared from the rare earth complex and composite hydrogel coated with the rare earth complex. The novel pH-response composite hydrogel containing the rare earth complex can improve luminescent performance, light stability, thermal stability and chemical stability of the rare earth complex, has the characteristic of being good in biological compatibility and degradability, and the like, and also has the advantages of being high in flexibility, short in time and reusable.

A biotic degradation polyester graft polyphosphazene interpolymer and its preparation method are disclosed. The biotic degradation polyester graft polyphosphazene interpolymer can be prepared by open loop polymerizing of lactonic monomer initiated by linear polyphosphazene containing side group that replaced the hydroxy. The adjustment of the hydrophilia, degradation, biotic compatible and the cellular affinity can be done to satisfy the different medical purpose through choosing different kinds of the second or the third replacing group and controlling their substituted ratio. Its advantages include: excellent biotic degradation, biotic compatible and non-toxicity.

The invention relates to the field of daub materials, in particular to PU (polyurethane) daub and a preparation method thereof. The PU daub mainly comprises a component A and a component B, wherein the component A is mainly prepared from polyether polyols, MDI and a flame retardant; the component B is mainly prepared from polyether polyols, a curing agent, a flame retardant, an antifoaming agent, a dispersing agent, a leveling agent and a surfactant. During usage of the PU daub, the component A and the component B are mixed, the obtained PU daub has the characteristics that the PU daub has better mechanical properties and better waterproofness, and is capable of being cured at the normal temperature, flame-retardant, non-toxic and the like, and is applicable to insides and outsides of sea ships. The technology of the preparation method of the PU daub is simple and easy to implement.

The invention relates to a heat-resistant control cable utilized by a nuclear power station. The heat-resistant control cable comprises a combined cable core and a coating. The combined cable core is formed by cable core wires according to a normal intertwisting mode; and the cable core wire comprises a core wire conductor and a double insulating layer, wherein the double insulating layer is wrapped at a peripheral portion of the core wire conductor. The coating is successively formed by a polyolefin filler, a polyester film separating layer, a shielding layer, a glass fiber flame retardant belt, a crosslinking polyethylene blanket, and a ceramic fireproof silicone rubber oversheath from inside to outside, wherein the shielding layer is woven by tin-coated copper wires. The filler is arranged on an intertwisting structure of the combined cable core. The core wire conductor is formed by tin-coated copper filaments or bunched wires formed by the tin-coated copper filaments according to a normal left-hand intertwisting mode. According to the invention, a high insulating property of the cable is ensured and a flame retardation requirement of the cable is also met; besides, a working temperature grade is substantially improved; a cable current-carrying capacity is increased; and a cable operation power is enhanced; meanwhile, the heat-resistant control cable has good performances of radiation resistance, low smoke, and halogen free performance.

The invention relates to amphipathic chitosan-bile acid derivatives and a preparation method thereof. The amphipathic chitosan-bile acid derivatives have the structure shown as a general formula I; and in the formula, R1 refers to H or COCH3, R2 and R3 respectively refer to -H or -OH, and R4 refers to -CH2CHOHCH3. The preparation method comprises the following steps of: reacting chitosan with bile acid in the presence of activating reagents of EDC and NHS to obtain hydrophobic chitosan-bile acid; and reacting the hydrophobic chitosan-bile acid with epoxypropane under the alkaline condition toobtain the chitosan-bile acid derivatives with good water solubility. By the method, the amphipathic chitosan-bile acid derivatives with high surface activity, emulsifying property and hydrotropy canbe obtained, and can serve as medicine solubilizing and sustained-release carriers.

The invention discloses rare-earth nucleoside fluorescent hydrogel as well as a preparation method and application thereof in fluorescent encoding. The preparation method of the rare-earth nucleosidefluorescent hydrogel comprises the following steps: (1) preparing a soluble rare-earth nitrate water solution and a nucleoside water solution; (2) uniformly mixing the soluble rare-earth nitrate watersolution and the nucleoside water solution and regulating the pH (Potential of Hydrogen) value to 7 to 9; raising the temperature to 55 to 95 DEG C and standing and reacting for 10 to 20min; coolingto room temperature and standing for 1 to 4h to obtain the rare-earth nucleoside fluorescent hydrogel with different fluorescent colors. The rare-earth nucleoside fluorescent hydrogel disclosed by theinvention has the advantages of environment-friendly and safe raw materials, simplicity in operation, low cost and good repeatability; the rare-earth nucleoside fluorescent hydrogel disclosed by theinvention keeps characteristic of emission fluorescent light of rare-earth ions and also has characteristics of good biocompatibility of biological small molecular nucleoside, biodegradability, no toxicity and the like. The obtained fluorescent hydrogel is regulated and controlled to obtain various fluorescent colors and can be used as a fluorescent encoding material; the fluorescent hydrogel canbe used for fluorescent biological detection, cell culture and tissue engineering.

The present invention relates to a method of soldering a semiconductor chip to a substrate, such as to a capsule in an RF-power transistor, for instance. The semiconductor chip is provided with an adhesion layer consisting of a first material composition. A solderable layer consisting of a second material composition is disposed on this adhesion layer. An antioxidation layer consisting of a third material composition is disposed on said solderable layer. The antioxidation layer is coated with a layer of gold-tin solder. The chip is placed on a solderable capsule surface, via said gold-tin solder. The capsule and chip are exposed to an inert environment to which a reducing gas is delivered and the capsule and chip are subjected to a pressure substantially beneath atmospheric pressure whilst the gold-tin solder is heated to a temperature above its melting point. The gas pressure is increased whilst the gold-tin solder is molten and the temperature is lowered when a predetermined gas pressure is exceeded, so that the gold-tin solder will solidify.

The invention discloses cellulose base - silicon hybridization microsphere and a preparation method thereof. The particle diameter of the cellulose base - silicon hybridization microsphere is 1mum to 10mum, the specific surface area is 100m2/g to 800m2/g, and the hole diameter is 200nm to 1000nm. The hybridization cellulose microsphere uses cellulose as a base material, sodium silicate as a hybrid material and a water solution of base/urea or thiourea as a solvent to prepare a cellulose - sodium silicate homogeneous phase solution, and then utilizes a method combining acid cure and heat cure to achieve phase conversion of sol gel to prepare the cellulose base - silicon hybridization microsphere. An organic solvent used by the cellulose base - silicon hybridization microsphere can be recycled. The preparation method is simple in whole preparation process, short in time, low in requirements on equipment and convenient in industrialization production. The cellulose base - silicon hybridization microsphere is good in flow property and mechanical property and wide in application.

The invention discloses a preparation method of an amino-terminated hyperbranched polymer grafted chitosan microsphere heavy metal ion adsorbent, and belongs to the field of water environment protection. The preparation method comprises the steps: firstly, preparing chitosan microspheres by a spray drying method; then grafting the surface of the chitosan microspheres with methacrylate through Michael addition to prepare methacrylate-grafted chitosan microspheres; and finally, grafting the surface of the methacrylate-grafted chitosan microspheres with diethylenetriamine by a substitution reaction, separating, washing and drying to obtain the heavy metal ion adsorbent. The amino-terminated hyperbranched polymer grafting method, the surface of the adsorbent is grafted with a large number of amide and amino functional groups, at the same time, the strategy of firstly preparing the microspheres and then grafting with the functional groups makes the functional groups exposed on the adsorbent surface to the greatest extent, and the adsorption effect of the heavy metal ion adsorbent is enhanced.

A preparing method of a fluorescence hollow silicon dioxide microsphere is disclosed. The method is characterized by comprising following steps of: (1) preparing a hollow silicon dioxide microsphere; (2) preparing an amino-modified hollow silicon dioxide microsphere; (3) preparing an intermediate 1; (4) preparing a fluorescence probe compound 1; and (5) preparing the fluorescence hollow silicon dioxide microsphere. The method is simple in preparation process and good in repeatability. Detection of hypochlorite by utilization of the prepared fluorescence hollow silicon dioxide microsphere is high in sensitivity, short in analysis time and simple in detection method.

The invention discloses a compression and heat resistant practical wire cable, which comprises a fireproof lapped covering, a plurality of main wire cores and a reinforcing core tube are arranged in the fireproof lapped covering, the reinforcing core tube is arranged among the plurality of main wire cores, and a plurality of compression-resistant support frames are arranged among the plurality ofmain wire cores at equal intervals. The reinforcing core tube penetrates through the plurality of compression-resistant support frames to make contact with the inner wall of the fireproof lapped covering, the interior of the fireproof lapped covering is filled with heat-insulating and flame-retardant particles, and the exterior of the fireproof lapped covering is coated with a compression-resistant and flame-retardant layer. The plurality of compression-resistant support frames are arranged on the main wire cores and the reinforcing core tube, so that a good compression-resistant protection effect can be achieved on the wire cable, when the cable is extruded, a polyurethane elastomer material can achieve a protection effect on the main wire cores and the reinforcing core tube, and the problems of short circuit and the like caused by damage of an insulating layer can be avoided; and when the cable is subjected to external impact, an elastic connecting piece can play a role in buffering,so that the stress of the cable can be dispersed, and the flame-retardant outer sheath is prevented from being damaged.