36results about How to "No blackening" patented technology

The invention relates to an electric heating barbecue oven which comprises an oven tank. A plurality of electric heating bars are arranged in the oven tank and are electrically connected with an external power source by the same power switch; an oven opening for leading heat radiation energy of the electric heating bars out of the oven tank from the inside of the oven tank is formed in the top ofthe oven tank, a skewer frame in the shape of a rectangular frame is arranged at the oven opening, a frame opening of the skewer frame is butted to the oven opening, the bottom of the skewer frame isfixed to the outer top surface of the oven tank, skewer grooves for laying skewers are symmetrically formed in the tops of two corresponding sides of the skewer frame, and kebabs on the skewers can bealigned with the oven opening by the aid of the skewer grooves; an oil collecting tray is arranged at the bottom of the oven tank, is opposite to the oven opening in the up-down directions, is used for collecting oil stain which drips from the kebabs, and is movably inserted in the oven tank from a tray opening formed in a side wall of the bottom of the oven tank. The electric heating barbecue oven has the advantages that the kebabs can be barbecued by the electric heating bars in a heat radiation manner, and accordingly the kebabs barbecued by the electric heating barbecue oven are healthfuland hygienic; soot can be prevented from being exhausted to the external, oil and juice which are generated when the kebabs are roasted can be prevented from dripping on the electric heating bars tobe combusted to generate smoke, and accordingly the electric heating barbecue oven is favorable for environmental protection.

The invention discloses an imitation golden decoration film capable of replacing gold foil and a preparation method of the imitation gold decoration film. The imitation golden decoration film comprises a base film, and a mold release agent layer, a first coating layer, an aluminum coating layer, a second coating layer and a gelatinous layer which are sequentially arranged on the base film, whereinthe first coating layer and the second layer are formed by mixing and coating of golden paints and an antioxidant. The imitation golden decoration film disclosed by the invention can replace gold foils, the color and luster are the same as those of the gold foils, and are golden bright, so that the same effect can be achieved; graphene oxide is added to the paint, so that the antioxidant abilityof the imitation golden decoration film is improved, and blackening phenomenon cannot generate after the imitation golden decoration film is used for a long time, and the imitation golden decoration film has favourable anticorrosion performance and waterproof performance; paraffine emulsion is adopted as a material of the mold release layer, the wax capacity coated onto the base film is uniform, the film forming is uniform, and the stripping effect is good; the preparation method is simple and convenient, environmentally-friendly and economic; the material costs are greatly reduced; the usingmethod is convenient; and the imitation golden decoration film is applied to decoration construction of all kinds of occasions.

The invention discloses a novel feed horn high frequency induction brazing method and a high frequency inductor. The novel feed horn high frequency induction brazing method comprises the following steps: firstly designing a horn structure, and enabling the assembling clearance of the connector between each of horns and the corresponding flange to be smaller than 0.1 mm; after processing horns and flanges, performing preassembling; cleaning qualified horns and flanges, and removing surface impurities; fixing the horns and the flanges on a working table, pre-coating with a brazing flux, and setting the distance between the high frequency inductor and the connectors; limiting the distance as 1-4 mm, re-calibrating the welding gap between each of the horns and the corresponding flange; arranging high frequency induction heating equipment, adjusting the output power and the welding technological parameters; adopting a high frequency induction brazing method, heating the connectors, and adding brazing filler metal after the brazing flux is molten; welding the connectors in sequence in a symmetric manner, performing post-welding cleaning after the workpieces are cooled so as to remove the residual brazing flux; one end of the connecting frame of the high frequency inductor is connected with one end part of an induction coil, and the other end is connected with an electrode; the induction coil is M-shaped, or a magnetizer is embedded in the lower part of the induction coil.

The invention provides a preparation method of dried zanthoxylum bungeanum maxim. The preparation method of the dried zanthoxylum bungeanum maxim comprises the following steps of naturally air-dryingpicked fresh zanthoxylum bungeanum maxim; dehumidifying with hot air: sequentially drying the naturally air-dried zanthoxylum bungeanum maxim in a drying chamber at 32 + / -0.5 DEG C for 2 + / -1 hours, in a drying chamber at 35 + / -0.5 DEG C for 3 + / -1 hours, and in a drying chamber at 37 + / -0.5 DEG C for 3 + / -1 hours; drying in a drying chamber at 39 + / -0.5 DEG C for 8 + / -1 hours to enable zanthoxylum oil to overflow out of the surface; drying in a drying chamber at 41 + / -0.5 DEG C for 9 + / -1 hours; drying the zanthoxylum bungeanum maxim subjected to the previous step in a drying chamber at 43 + / -0.5 DEG C for 5 + / -1 hours, and then drying the zanthoxylum bungeanum maxim in a drying chamber at 45 + / -0.5 DEG C for 3 + / -1 hours; and in the drying process, heating cold air by a heater and introducing into the drying chamber, and introducing generated damp-hot air into a heat exchanger as a heat source for preheating cold air. According to the preparation method of the dried zanthoxylum bungeanum maxim provided by the invention, waste heat recovery is achieved, power consumption is greatly reduced, emission of air containing pollutants is fundamentally eradicated, and energy conservationand emission reduction of pepper drying are achieved.

The invention belongs to the field of materials, and discloses a thermotropic liquid crystal polyester obtained by reacting monomers, aliphatic acid anhydrides and catalysts. The monomers include: HO-Ar-COOH (I), HO-Ar-OH ( II), at least one of HOOC-Ar-COOH (III), wherein, Ar is wherein, Ar is at least one of phenyl, biphenyl, naphthyl, anthracenyl or phenanthrenyl; the aliphatic The amount of substance of acid anhydride is 1.3-3 times of the amount of substance of hydroxyl group in the monomer. The present invention eliminates the by-product fatty acids and strictly controls the amount of aliphatic acid anhydrides during the acetylation reaction process, so that the acetylation reaction is more complete, and the clogging caused by monomer volatilization is reduced, and the thermotropic liquid crystal polyester prepared is not There will be blackening, no blistering during reflow, and excellent mechanical properties.

The invention discloses an aluminum-based circuit board laser cutting process and equipment thereof. An aluminum-based circuit board comprises an aluminum substrate, an insulating layer is arranged on the aluminum substrate, a copper foil circuit formed by etching a copper foil and a sunken position are arranged on the insulating layer, a paint layer is arranged on the copper foil circuit and the sunken position, and a groove is formed in the sunken position by the paint layer; a joint cutting mode of carbon dioxide laser and optical fiber laser is adopted, the energy density of the carbon dioxide laser is relatively low, the cutting effect on a paint layer and an insulating layer in the aluminum-based circuit board is good, after the paint layer and the insulating layer are cut, the edges are free of dust, burrs and deformation, and a copper foil circuit is free of damage, blackening and oxidation; and the energy density of the optical fiber laser is relatively high, the cutting effect on the aluminum substrate is relatively high, and the edge of the cut aluminum substrate is smooth and neat.

The invention discloses an alkali cleaning fluxless or vacuum brazing sheet preparing method. The method comprises following steps that an alloy casting device is adopted, a casting ingot is casted, acore layer and a brazing layer are each subject to annealing, and then are hot rolled into thin sheets, all layers are welded together, hot rolling and cold rolling are carried out, finally, annealing is carried out, before welding, and a surface treatment method is executed. The surface treatment method comprises following steps that firstly, an organic solvent is used for cleaning the surface of an alkali cleaning fluxless or vacuum brazing sheet; secondly, alkali liquor is used for cleaning a product in the first step, and the product comprises one or multiple of 0 to 5wt% of sodium gluconate, 0 to 5wt% of sodium pyrophosphate, 0 to 10wt% of sodium carbonate, 0 to 3% of sodium phosphate and 1 to 10wt% of sodium bicarbonate, 0 to 1wt% of NaOH and 0 to 5wt% of sodium silicate; thirdly, asaturated EDTA solution or saturated isopropanol solution is used for cleaning the product in the second step; fourthly, a salpeter solution is adopted to carry out acid pickling on the product obtained in the third step; fifthly, washing is carried out. The corrosion to silicon particles is small, the pollution is small, good brazing gaps are ensured, and the good effect is obtained.

The invention provides an aluminum mobile phone battery cover whitening agent and a preparation method thereof, which is prepared as follows: at room temperature, the above-mentioned solid raw materials: sodium silicate, sodium gluconate, sodium citrate monohydrate, sodium benzoate The raw materials of sodium hydroxyethylidene diphosphonate are stirred and dissolved in ion-free water, and then the liquid raw materials triethanolamine and non-foaming amphoteric surfactant are added and stirred evenly to obtain a transparent liquid. It can clean the die-casting aluminum mobile phone battery cover and has a good cleaning effect. The raw materials used in the product formula are all environmentally friendly raw materials, and there are no environmentally controlled substances. The product performance is mild, environmentally friendly and non-toxic, and the production process is simple. Low cost, no smell, good effect, no pollution to the environment.

The invention discloses a method for improving the surface quality of a low-oxygen light copper rod with the diameter of 8mm. The method is improved on the basis of a traditional production process of the low-oxygen light copper rod with the diameter of 8mm. The method comprises the following procedures of preparing materials, smelting, casting, rolling, washing, drying by blowing, coating wax and packaging, and is characterized in that the procedures of rolling, washing, drying by blowing, coating the wax are improved; a primary edge milling and emulsion circulating system is additionally arranged in the rolling procedure, and formulas of emulsion, washing liquid and wax liquid are optimized. The surface quality of finished products is improved, the effect is remarkable, energy and consumption are saved and the production cost is reduced. The method relates to the field of machining of metal copper.

The present invention discloses a breeding matrix for coprinus comatus cultivation, wherein the breeding matrix comprises straw, wheat bran, gypsum, corn powder, palm fiber, baking soda and zeolite. According to the present invention, the whole fungus stem of the bred coprinus comatus is white, the lower end of the fungus stem does not produce the darkening phenomenon, the growth period is shortened by more than 50% compared to the general coprinus comatus growth period, plant diseases and insect pests are not generated during the growth process, and at least two batches of the coprinus comatus can be bred with the same breeding matrix.

The lamp has an anode (31) and a cathode, which are arranged opposite to each other in a fluorescent tube. The anode comprises a middle region at a pointed end, and an edge region, which radially surrounds the middle region. The pointed end lies opposite to the cathode. A buffer material (36) made of metal with reduced yield stress than anode material is arranged between the middle region and the edge region. The buffer material consists of an insert body (35), which is separated from the anode. The insert body is inserted into an opening by the buffer material.

The invention relates to a preparation method of white peppers. The method comprises the following steps: 1) raw material preparation; 2) raw material pretreatment; 3) spreading and drying in the sun;4) mixing; and 5) pickling. The method strictly controls the addition amount of salt so as to control the generation of harmful substances and to reserve nutrient components of the raw materials to amaximum extent. Meanwhile, a proper amount of vinegar is added, so that the prepared peppers do not appear to be black. The method carries out pickling by using a mud jar replacing ceramic or glass jars in the prior art, so that the prepared peppers have a white, light and transparent color, are free from water and free from melting no matter how long the peppers stay in the jar, and have a delicious, crisp and refreshing mouth feel.