49results about How to "Avoid chemical corrosion" patented technology

The invention discloses an environment-friendly water-based fire extinguishant for a forest fire fighting airplane and a preparation method of the environment-friendly water-based fire extinguishant. The preparation method comprises the following steps of firstly, mixing and stirring macromolecular water absorbing resin and a flow promoter and keeping the temperature rise of powder to be not higher than 10 DEG C; then adding a colorant to mix and stir to prepare composition powder with good flowability; and injecting the composition powder driven by compressed nitrogen into water by means of pipeline conveyance, wherein jet flows entering the water generate a lot of micro nitrogen bubbles which promote powder particles to be quickly dispersed in water, the single particles are in full contact with water in a suspended form, and the particles absorb a lot of water molecules to quickly generate a hydrogel fire extinguishant which has a very good adhesive force to forest vegetation, so that the fire extinguishing efficiency of the water is greatly enhanced. The hydrogel fire extinguishant does not corrode metal parts of the airplane and is bio-environment-friendly to the forest.

The invention relates to a production process of a high-quality high-finish titanium and titanium alloy sheet or belt, which is carried out according to the following flow: heating after coating glass powder, hot rolling, polishing by a polishing machine, rolling in cold and reserving 5-15% machining allowance, vacuum annealing, polishing, rolling in cold and polishing to a mirror surface. In the invention, a general atmosphere furnace or electric furnace in the annealing process of the rolling process of the original technology is changed into a vacuum furnace or cover-type furnace and certain coating protection is carried out on the surface, after 5-10% of machining allowance is reserved, preannealing is carried out in advance, and then mill machining and leveling of the final one pass are carried out. The accuracy of the obtained machined sheet is increased by 5%-20% and the degree of finish is improved by 5%-50%.

The invention discloses a pipeline cleaning device. The pipeline cleaning device comprises a flow collecting cavity body provided with an installation connector, a gas working medium source for providing a gas-state cleaning working medium, a liquid working medium source for providing a liquid-state cleaning working medium and a particulate matter detection unit for detecting cleanliness, whereina cleaned pipeline can be connected with the flow collecting cavity body in a sealed mode through the installation connector; and the gas working medium source communicates with the flow collecting cavity body through a gas pipeline, the liquid working medium source is connected with the flow collecting cavity body through a liquid flow channel provided with a liquid pump, and the liquid working medium source can provide the liquid-state cleaning working medium for the cleaned pipeline through the flow collecting cavity body. The invention further discloses a cleaning method applying the pipeline cleaning device. The cleaning device and the cleaning method have the advantages of being high in cleaning efficiency, high in intelligent degree, scientific in cleaning strategy, and capable of meeting the need of cleaning for various types of pipelines and the like; and the fluid pipeline cleaning device further has the advantages of being good in responsiveness, long in service life, safe and reliable in system and the like.

The invention discloses a method for manufacturing a paint for temporary protection on the metal surface, which comprises the following steps: dissolving 30%-40% chloroacetic resin powder with alcohol solvent; dissolving 20% cellulose acetate butyrate with butyl acetate and dimethylbenzene mixed solvent; mixing dissolved chloroacetic resin and cellulose acetate butyrate according to 2:1-3:1; adding 0.5% dimethyl silicon oil; mixing homogeneously; adding deflocculating agent (butyl alcohol:butyl acetate=1:1). The invention is provided with adhesive force and striping property, which avoids the chemical corrosion of the metal.

The invention relates to a round comb, which comprises comb teeth, a comb frame and a handle, wherein the comb frame is made of metal materials and adopts a hollow design, a plurality of small three-dimensional ventilation air holes are arranged on the comb frame, the comb teeth are ranged on the comb frame in a spiral shape, the comb teeth are made of ceramic materials, pig horsehair is arranged on the comb teeth, the ceramic comb teeth are adopted, the hot air diffusion is fast, the instantaneous heat conduction can be realized, the cleaning is easy, the metal comb frame is adopted, the heat energy can be uniform, in addition, the chemical corrosion can be avoided, the pig horsehair is used as the comb hair, the hair can be bright, in addition, the scalp cannot be injured, the comb teeth are ranged in the spiral type, the grasping force is strong, and the round comb is suitable for being used for modeling. The handle adopts a carbon element antistatic handle, softness and comfort are realized, in addition, projected anti-slip veins are arranged on the handle, in addition, the comb frame is in a hollow type, users can easily hold the comb, the labor is saved, the three-dimensional ventilation air holes are arranged on the comb frame, and the nonuniform heating is avoided.

The invention discloses an obstructive explosionproof composite and a preparation method thereof. Honeycomb aluminum foil or honeycomb paper foil is used as a structural base material, and after the surface of the structural base material is coated with a coating having corrosion prevention and electric conduction function, the problems that existing metal obstructive explosionproof materials areeasy to corrode and short in use life, and cannot be used in dynamic fuel storage vessels are solved. When the honeycomb paper foil is used as the structural base material, production cost of an existing obstructive explosionproof material system can be substantially reduced, and the obtained obstructive explosionproof composite is suitably applied to large oil material storage vessels, and simultaneously the preparation method of the obstructive explosionproof composite facilitates large area popularization and usage of the obstructive explosionproof composite.

The invention belongs to the field of draining pumps and particularly relates to a draining pump with an impeller of a small hub ratio. The draining pump comprises the impeller and a drive part for driving the impeller to rotate, wherein the impeller has a small hub ratio. The draining pump further comprises a shell. The drive part comprises a stator component fixed on the shell, and a rotor component matched with the stator component. The rim of the impeller of the small hub ratio is fixedly connected with the inner wall of the rotor component, and rotates along with the rotor component. Themiddle of the impeller of the small hub ratio is hollow. The draining pump has the beneficial effects that the impeller of the small hub ratio has reasonable structure and good impeller of the small hub ratio; while the flow and lift meet the requirements of design conditions, the draining pump has the advantages that compared with a traditional structure, the hub size is reduced by about 64%, theexternal diameter of the impeller is reduced by about 13%, the discharge capacity of the impeller is remarkably improved, the sectional area of a runner is enlarged under the condition of the same inlet diameter, and thus the hydraulic efficiency of the draining pump is improved.

The invention brings forward an IGBT structure and a preparation method thereof. The IGBT structure comprises a main chip and a protection layer. The protection layer further comprises a silicon nitride film formed on the main chip and a polyimide film formed on the silicon nitride film. The IGBT structure is provided with the silicon nitride and polyimide film composite protection layer, and the composite layer employs a secondary photoetching process so that good film quality of each film is ensured, quite good mechanical property, corrosion resistance property, moisture resistance property and external ion resistance property are provided, and manufactured devices are stable and reliable.

A cadmium telluride solar cell with a Te-Ti-Cu pre-set layer utilizes the pre-set Te-Ti-Cu layer of a periodic structure, and the pre-set Te-Ti-Cu layer is arranged on the back surface of an absorption layer of the cadmium telluride solar cell to be used as a back contact layer and a back electrode material of the cadmium telluride solar cell. The cadmium telluride solar cell with the Te-Ti-Cu pre-set layer can restrain copper diffusion on the material configuration and material property, eliminate the negative impact brought by copper diffusion, realize ohmic contact, avoid chemical corrosion and alone deposition of other metals as electrodes, reduce device production processes, enhance the photoelectric conversion efficiency of the solar cell and improve the long-term stability of devices.

The invention discloses a method for preparing a composite magnet from a surface tinned magnetic powder through hot embossing. The method includes the steps of covering the magnetic powder unoiled and activated previously with a low-melting-point metal tin coating by an electroplating technique or chemical plating technique method in a plating tank in which an alkaline plating solution containing tin ions is held, and then obtaining the magnetic powder covered with the tin coating through separating, washing and purifying, and preparing the tinned magnetic power into the composite magnet by the way of hot embossing. Due to the adoption of the method, the problems of easy aging, easy shrinking, easy water absorption and poor organic solvent resisting capability of the composite magnetic with a thermosetting resin as an adhesive are effectively improved; the tin coating is enabled to cover the particles of the magnetic powder in advance; the distribution uniformity of the magnetic powder and the metal tin is effectively promoted; when the composite magnet is prepared, the proportion of the adhesive in the magnetic is effectively reduced while the same mechanical strength in the prior art is achieved; and therefore, the magnetic performance of the composite magnet is improved.

The invention relates to a protection device for an ocean platform vertical pipe. The protection device for the ocean platform vertical pipe comprises a float bowl with a through hole, wherein the vertical pipe is located in the through hole of the float bowl; and the protection device further comprises an inner layer protection assembly, an outer layer protection assembly and a protection layer,wherein the inner layer protection assembly comprises a buffer ring surrounding the periphery of the vertical pipe and fenders arranged between the vertical pipe and the buffer ring; the outer-layer protection assembly comprises a protection cylinder and a buffer structure arranged between the buffer ring and the protection cylinder; and the protective layer wraps the outer wall of the vertical pipe. The protection device has the beneficial effects that the anti-collision capacity of the vertical pipe is improved, damage to the vertical pipe is avoided, and the service life of the vertical pipe is prolonged.

The invention discloses a gas pipe network high-pressure magnetic repair device. The device comprises a magnetic portion, a lever portion and a diffusion drainage portion, wherein the magnetic portionis a driving force source of the whole repair device, the diffusion drainage portion can diffuse leaked natural gas to a safety area so as to avoid damage to repair persons due to large concentrationof natural gas, meanwhile, the pipeline plugging operation can be carried out, the action of the lever portion is to connect the magnetic portion and the diffusion drainage portion, so that the diffusion drainage portion is provided with strong magnet attraction force. The device has the beneficial effects that during gas leakage repair of a paramagnetic pipeline, the super-strong suction force of a magnet is used for resisting the impact force generated by the high-pressure air flow, so that leakage of a high-pressure pipe network is realized.

The invention provides a production method of an InP-based heterojunction bipolar transistor. The method comprises the steps of: carrying out photoetching on an emitter epitaxial layer on the surface of the InP-based heterojunction bipolar transistor by using a deep ultraviolet light source so as to form an emitter electrode; corroding the emitter epitaxial layer with the emitter electrode, and exposing a base epitaxial layer of the InP-based heterojunction bipolar transistor; carrying out photoetching on the exposed base epitaxial layer by using the deep ultraviolet light source so as to form a base electrode; corroding the base epitaxial layer with the base electrode, and exposing a collector epitaxial layer of the InP-based heterojunction bipolar transistor; and carrying out photoetching on the exposed collector epitaxial layer by using the deep ultraviolet light source so as to form a collector electrode. According to the production method provided by the invention, PMMA (polymethyl methacrylate) photoresist is used for being matched with deep ultraviolet light to carry out photoetching, and use of an alkaline reagent is avoided, so that chemical corrosion of an alkali substance to GaAsSb is effectively avoided, electric properties of a conducting channel and two-dimensional electron gas are ensured to the greatest extent, and device performance of the InP-based GaAsSb HBT (Heterojunction Bipolar Transistor) is promoted.

The invention relates to a laying method of a copper bar streamline for preventing electromagnetic interference of a secondary cable of a transformer substation, and the laying method comprises the following steps: (1) laying a copper bar streamline in a cable trench; (2) L-shaped corner copper bars used for connecting the copper bar streamline and the grounding grid flat steel being arranged between the copper bar streamline and the grounding grid flat steel at intervals; and (3) the secondary cable being electrically connected with the copper bar streamline. According to the laying method, the operation safety of the secondary cable and the relay protection equipment can be effectively guaranteed.

The invention provides an integrated heat pipe heat dissipation device. The integrated heat pipe heat dissipation device comprises an evaporator (1), a heat conduction pipe (2), cooling fins (3), fixing end plates (4) and an outer cover (5). The integrated heat pipe heat dissipation device is characterized in that the heat conduction pipe (2) is formed by bending a whole continuous pipe in a loopmanner, and a certain included angle exists between the axis of the heat conduction pipe and the horizontal direction. The integrated heat pipe heat dissipation device is good in anti-corrosion performance, high in heat dissipation efficiency, large in safety margin and long in service life and has the beneficial effects of being small in weight, low in cost, capable of saving water, materials andenergy, environmentally friendly and the like.