45results about How to "Impurities are simple" patented technology

The invention provides a metallized-film capacitor sealing agent composed of components of, by weight: 40 to 60 parts of petroleum wax, 10 to 15 parts of polyisobutylene, 20 to 30 parts of vaseline, 10 to 15 parts of mica powder, 10 to 15 parts of vermiculite powder, 10 to 15 parts of sulfur, 3 to 5 parts of straw ash, and 10 to 15 parts of attapulgite. The metallized-film capacitor sealing agentprovided by the invention has good toughness and plasticity, excellent electrical properties, and appropriate kinematical viscosity. With the sealing agent, gaps between metallized-film capacitors can be conveniently filled.

The invention provides a sealing paste of a metallized film capacitor, which includes the following components, by weight, 40 to 60 parts of petroleum wax, 10 to 15 parts of polyisobutene, 20 to 30 parts of vaseline, 10 to 15 parts of mica powder, 10 to 15 parts of vermiculite powder, 10 to 15 parts of sulphur and 10 to 15 parts of attapulgite. The sealing paste of the metallized film capacitor has good toughness and plasticity, excellent electrical property and appropriate kinematic viscosity, and easily fills gaps of the metallized film capacitor.

A solution casting method comprises the following steps of: dissolving a solute in a solvent to prepare a casting solution; preparing a casting plate by float glass; arranging a heating device on an insulation base plate; arranging a rack on the periphery of the heating device and putting the casting plate on the rack; arranging a cooling water jacket on the insulation base plate, and letting the cooling water jacket encircle the heating device, the rack and the casting plate; arranging a condensed solvent collecting tank at the bottom of the cooling water jacket; pouring the casting solution into the casting plate; arranging an insulation top cover over the cooling water jacket, and sealing the internal space encircled by the cooling water jacket and the insulation base plate; starting the heating device to heat the casting solution so as to completely evaporate the solvent in the casting solution; continuously heating to further raise crystallization degree of a film; stopping heating, and peeling the film off from the casting plate; detecting the film thickness, adjusting the heating field, and raising thickness uniformity of the finished product film. The method provided by the invention has advantages of simple technology, cheap equipment and low film preparation cost. the finished product film has advantages of high degree of crystallization, isotropy, uniform thickness, few impurities, good appearance, high yield and the like.

The invention belongs to the technical field of optical fiber manufacturing, and discloses a method for manufacturing a polarization-maintaining optical fiber, comprising the following steps: on the wall of the first layer of casing, cutting a notch symmetrically with respect to the center line of the inner cavity of the first layer of casing; Stress rods are filled in the incision, and an optical fiber preform core rod is embedded in the first layer of casing; a second layer of casing is nested outside the first layer of casing to form a polarization-maintaining optical fiber preform; The polarized optical fiber preform is drawn into a polarization-maintaining optical fiber; wherein, the structure of the gap is filled by a stress rod. During the high-temperature drawing process, the circular stress rod will greatly fill the gap in the cut after softening, forming a polarization-maintaining optical fiber. required stress zone. The invention proposes a polarization-maintaining optical fiber manufacturing method with double sleeves and stress rods, which has a simple structure, greatly simplifies the processing technology and reduces the requirements for labor and equipment; it can greatly improve the impact of impurities on product quality; at the same time, it avoids Various high-precision operation requirements in the prior art.

The invention relates to a long-service-life lining material for a whole pipeline for a large and medium sized blast furnace hot blast stove. The lining material comprises a permanent lining and a work lining, wherein the permanent lining and the work lining are respectively formed by casting and baking a substrate-purified high-intensity micro-pore light material and a substrate-purified high-intensity mullite material. The lining material provided by the invention can solve the technical problem that the lining material of the large and medium-sized blast furnace hot blast stove in the prior art is easy to crack, collapse and deform due to being subjected to high temperature of 1200-1300 DEG C, frequent temperature fluctuation and high-speed alkali-containing and carbon medium-containing hot air erosion for a long term. After a hot air stove pipeline having the safety lining and the work lining is used, the service life of the hot air stove pipeline can be observably prolonged, the stop time for repairing can be reduced, and the production efficiency can be greatly improved, so that the lining material is huge in economic benefit and social benefit.

The invention relates to a preparation method of acyloin compounds, and belongs to the field of fine chemical industry. A new catalyst 1-n butyl benzimidazole hydrochloride is provided for synthesis of the acyloin compounds, and the products have the advantages of good quality and less side reactions; deficiencies existed in the prior art are overcome.

The invention belongs to the technical field of a paint spray gun, and relates to a material tank fast mounting structure of a paint spray gun. The material tank fast mounting structure is characterized in that two sides, relative to an axial line, on the inner wall of the upper side of a first joint are respectively provided with short shafts or convex blocks transversely pointing at the axial line, two sections of arc-shaped grooves or bulges are axisymmetrically arranged on the outer wall of the lower side of a second joint, notches through which the short shafts or the convex blocks arranged on the first joint can pass via axial moving are formed in the end parts of the two sections of arc-shaped grooves or bulges, the short shafts or the convex blocks arranged on the first joint pass through the notches through axial moving, then rotate and can be clamped and connected onto the grooves or the bulges for realizing the fast connection of the first joint and the second joint, and a sealing ring is arranged between the first joint and the second joint. The material tank fast mounting structure has the advantages that the fast dismounting and mounting of the paint spray gun and the material tank can be realized by the first joint and the second joint, the production process is simple, the service life is long, the product maintenance is good, and the material tank fast mounting structure is applicable to the fast dismounting and mounting structure of various types of paint spray guns and material tanks.

The invention relates to a preparation method for a nano-crystallization low-alloy heat-resistant high-strength steel mould. The preparation method comprises the following steps: (1) preparing low-alloy steel from the following components in percentage by weight: 0.09-0.15% of C, 1.35-1.55% of Cr, 0.22-0.28% of Si, 0.33-0.38% of Mn, 0.17-0.24% of Mo, 0.05-0.15% of Ni, 0.05-0.08% of Nb, 0.15-0.35% of V, less than or equal to 0.010% of P, less than or equal to 0.010% of S and the balance of Fe and inevitable impurities; (2) processing the low-alloy steel obtained in the step (1) into a required dimension and a required shape, thereby obtaining a low-alloy steel mould; and (3) carrying out surface nanocrystallization treatment on the low-alloy steel mould prepared in the step (2). The nano-crystallization low-alloy heat-resistant high-strength steel mould prepared by the preparation method disclosed by the invention is improved in heat resistance and corrosion resistance; and meanwhile, the varieties of the alloys are reduced, the impurity components are simpler and easy to control, and a nitride effective penetrating layer is remarkably increased in thickness.

The invention discloses an oxiracetam freeze-dried powder injection and a preparation method thereof. The oxiracetam freeze-dried powder injection is prepared by dissolving oxiracetam in water for injection, and then adding 1.2% to 2.0% (V / V) ethanol of the total volume to prepare 200 to 500 mg / ml of oxiracetam Racetam solution, obtained by lyophilization. The oxiracetam freeze-dried powder injection is prepared by adding an appropriate amount of ethanol and combined with a special freeze-drying process, especially a special pre-freezing method, and formulates the pre-freezing process parameters so that the surface of the solution crystallizes first, avoiding the surface Solute accumulation. The oxiracetam freeze-dried powder injection prepared by the invention basically does not contain auxiliary materials, has rapid reconstitution, good quality and stable storage.

The invention discloses a preparation method of a low temperature concentrated burdock gastric ulcer protection beverage. The method improves on the existing technology and the prepared beverage has the functions of inhibiting gastric ulcer and protecting the intestines and stomach and is particularly suitable to be eaten by people with gastric ulcer, chronic gastritis or other diseases. The invention adopts the root of fresh burdock as the production raw material to perform special processing so that rich nutritional components contained by the raw material can be absorbed by human body and the good taste of the product can be ensured. Therefore, the prepared beverage is really a purely natural and green nutritional product, has the functions of nourishing yin, maintaining beauty, detoxifying, protecting the stomach and promoting gastrointestinal motility, has strong pertinence and obvious effects, and is especially suitable to be eaten by people with gastric ulcer, chronic gastritisor other diseases. The invention belongs to the health food technology. The beverage has good health-care effect on the stomach and can promote the improvement and self-healing of gastric ulcer and chronic gastritis; and the beverage contains various vitamins and has natural preservation and not any side effect, thus being a dietetic competitive product.