11 results about "Lead tetraoxide" patented technology

The invention discloses a sintering aid coated lead barium titanate-based thermal sensitive ceramic and a preparation method thereof, and relates to the technical field of material science, the raw materials of the core layer comprise barium carbonate, lead tetraoxide, calcium carbonate, strontium carbonate, zirconium oxide, tin oxide, titanium dioxide, manganese oxide and niobium pentoxide; the raw materials of the shell layer comprise silica sol, an aluminum compound, a calcium compound, a sodium compound, a potassium compound, a magnesium compound and boric acid; the preparation method comprises the following steps: mixing the raw materials of the core layer, calcining at 950-1050 DEG C, adding a deionized water solution of the raw materials of the shell layer, mixing, calcining at 1000-1100 DEG C, adding a polyvinyl alcohol water solution, granulating, forming, degumming and sintering to obtain the sintering aid coated lead barium titanate based thermal sensitive ceramic. According to the invention, the sintering aid is used for coating the lead barium titanate-based thermal sensitive ceramic, so that the densification of the ceramic is promoted while grains are refined, and the ceramic has high voltage resistance and excellent PTC (Positive Temperature Coefficient) effect.

The invention discloses a PTC ceramic material and a preparation method thereof, and relates to the technical field of PTC, and the PTC ceramic material is prepared from the following components: 50-65 parts of barium titanate, 12-16 parts of lead tetraoxide, 0.1-0.3 part of yttrium oxide, 0.1-0.3 part of lanthanum oxide, 6-15 parts of modified silicon boride, 4-10 parts of aluminum oxide, 1-3 parts of ammonium polyacrylate, and 3-6 parts of polyvinyl alcohol. Through synergistic cooperation of a barium titanate main body and functional fillers such as modified silicon boride, leap-type improvement of the comprehensive performance of the PTC ceramic material is realized, on the basis of maintaining excellent PTC characteristics, the heat conductivity coefficient and the breaking strength of the material are effectively improved, the thermal shock resistance and the mechanical reliability are remarkably enhanced, and the PTC ceramic material has good application prospects. The method is especially suitable for the high-end application fields of automotive electronics, industrial control, high-power LED driving and the like.

The invention discloses a high-pressure-resistant lead barium titanate-based thermal sensitive ceramic and a preparation method thereof, and belongs to the technical field of material science, a core layer of the high-pressure-resistant lead barium titanate-based thermal sensitive ceramic comprises the following raw materials in parts by mole: 2-5 parts of lead tetraoxide, 25-39 parts of barium carbonate, 30-45 parts of titanium dioxide, 0.03-0.3 part of manganese oxide and 0.2-0.4 part of niobium oxide; the shell layer comprises the following raw materials in parts by mole: 1-15 parts of a barium compound, 5-20 parts of a titanium compound, 0-3 parts of a strontium compound, 0-5 parts of a calcium compound, 0.5-5 parts of zirconium oxychloride and 1-8 parts of a tin compound; the preparation method comprises the following steps: mixing the raw materials of the core layer, calcining at 1000-1100 DEG C, adding a deionized water solution of the raw materials of the shell layer, mixing, spray-drying, calcining at 950-1050 DEG C, adding a polyvinyl alcohol water solution, granulating, forming, degumming and sintering. The ceramic prepared by the preparation method disclosed by the invention has high voltage-resistant characteristic and excellent PTC (Positive Temperature Coefficient) effect.

The invention belongs to the technical field of chemical engineering, and relates to a composition for a detonation sound agent, the detonation sound agent and a preparation method and application of the detonation sound agent. The technical problems that in the prior art, pyrotechnic composition and aluminum magnesium alloy powder serve as raw materials, potential safety hazards exist in the preparation and storage process, sulfur dioxide generated after combustion easily forms acid rain, and the detonation sound value does not reach the standard are solved. The invention provides a composition for a detonation sound agent, which comprises the following raw materials: 75-85 wt% of lead tetraoxide, 10-15 wt% of aluminum-silicon alloy powder and 5-10 wt% of nitrocellulose gum solution, and has the effects of high detonation sound value, high stability and safety, and suitability for large-scale industrial production and use. The invention further provides a detonation sound agent and a preparation method of the detonation sound agent. Meanwhile, the invention further provides application of the detonation sound agent in preparation of the bird repelling bomb, when the explosive quantity is 300 mg, the set-off sound level value at the position 2 m away from the acting position can reach 120 dB or above, and the good high-altitude bird repelling effect is achieved.

The present invention belongs to the technical field of fine chemical industry, and discloses a dispersant for dispersing heavy element single substance and compound powder and a preparation method thereof, wherein the main function is to be used as a powder dispersant, especially suitable for dispersing heavy element powder that is easy to settle; bismuth powder, lead powder, tungsten powder, lead oxide, lead tetraoxide, bismuth oxide, tungsten oxide, lead tungstate, lead borate and other functional particles with shielding ability. The anionic dispersant containing multiple hydrophilic groups such as sulfonic acid group, ester group and hydroxyl group in the structural formula is used to disperse heavy element powder, which can neutralize the excess charge on the oxide surface and wrap the powder particles, and finally form a uniform and stable high-content heavy element powder latex system, creating conditions for preparing radiation-proof latex products.

The invention provides a smoke agent for a starting cartridge. The smoke agent comprises 40 wt% of lead tetraoxide; 10 wt%-30 wt% of a strong oxidant; 25 wt%-35 wt% of silicon carbon powder; 8 wt%-10 wt% of a combustion agent; 0.5 wt% to 1.5 wt% of an adhesive; the strong oxidant is ammonium nitrate or barium nitrate. Compared with the prior art, the smoke agent for the starting cartridge has the advantages that specific components with specific contents are adopted, overall good interaction is achieved, on the basis that the obtained smoke agent for the starting cartridge meets various use requirements, potassium chlorate which is prone to being affected with damp is prevented from being used, the free-running property is good, and meanwhile the situation that the explosive loading amount of the smoke agent is not uniform is avoided.

The invention discloses a method for recovering lead tetraoxide from waste lead plaster, which comprises the following steps: (1) obtaining a waste lead plaster material, and drying to obtain a lead plaster sample; (2) carrying out acid leaching pretreatment on the waste lead plaster: carrying out acid leaching on the lead plaster sample obtained in the step (1) by using dilute sulphuric acid, wherein the lead plaster sample subjected to acid leaching comprises the main components of PbSO4 and PbO2; (3) desulfurization reaction: leaching the lead plaster sample in the step (2) by using an ammonium oxalate solution to obtain a solid mixture of lead oxalate and lead dioxide; and (4) roasting: roasting the solid mixture in the step (3) to obtain lead tetraoxide. According to the method, the ammonium oxalate solution serves as a desulfurizing agent to directly desulfurize the lead plaster, the obtained solid mixture is directly roasted to obtain a lead tetroxide product, lead dioxide in the waste lead plaster is fully utilized, and the defects that in the process of recovering lead from the waste lead-acid storage battery, the usage amount of chemical reagents is too large, the technological process is long, and secondary pollution is caused are overcome; the method is suitable for industrial production.

The invention discloses lead paste for a lead-acid battery and a preparation process of the lead paste, and belongs to the technical field of lead-acid batteries, the lead paste comprises the following raw materials in parts by weight: 90-100 parts of lead powder, 0.1-0.2 part of high-strength short fiber, 15-20 parts of lead tetraoxide, 1-1.5 parts of tetrabasic lead sulfate, 5-12 parts of modified graphene, 0.2-0.3 part of bismuth oxide, 0.1-0.15 part of stannous mono-sulphate, 10-15 parts of sulfuric acid solution and 8-16 parts of deionized water; the modified graphene is prepared by the following steps: uniformly mixing concentrated sulfuric acid and sodium nitrate in a reaction flask, and slowly adding graphite powder under an ice-water bath condition. By optimizing the formula and the preparation process of the lead paste for the lead-acid battery, and particularly introducing the modified graphene, the conductivity and the thermal stability of the lead paste are remarkably improved, the binding force between the lead paste and a grid is enhanced, and the falling of active substances is reduced, so that the cycle life of the battery is remarkably prolonged, and the capacity of the battery is remarkably improved.

The invention discloses lead-barium titanate-based thermal sensitive ceramic powder and a preparation method thereof. The lead-barium titanate-based thermal sensitive ceramic powder has a core-shell structure, the core layer comprises the following raw materials in parts by mole: 2-7 parts of lead tetraoxide and 6-21 parts of titanium dioxide; the shell layer is prepared from the following raw materials in parts by mole: 22 to 42 parts of barium compound, 1 to 10 parts of tin compound, 0.5 to 6 parts of zirconium oxychloride, 0.5 to 8 parts of calcium compound, 0.1 to 4 parts of strontium compound, 29 to 44 parts of titanium compound, 0.02 to 0.3 part of manganese compound and 0.1 to 0.5 part of niobium oxalate. The preparation method comprises the following steps: preparing PbTiO3 powder and a deionized water solution, calcining, and finally carrying out spray granulation to obtain the barium lead titanate-based thermal sensitive ceramic powder. According to the invention, the ceramic obtained by sintering has low room temperature resistivity, high Curie point, excellent PTC effect and high voltage withstanding characteristic.

The utility model discloses an X-ray emitter. The X-ray emitter is characterized in that an open window is formed in the peripheral wall of an X-ray shielding barrel in a penetrating manner; the X-ray tube is mounted in the X-ray shielding barrel; the separator is provided with a first window in a penetrating manner, a mounting table is arranged at the bottom of the separator, and the separator is made of a lead tetraoxide material; the beryllium window is mounted on the mounting table; wherein the isolation piece is installed on the open window, the beryllium window penetrates through the open window to be embedded into the X-ray shielding barrel, and a ray emitting port of the X-ray tube, the beryllium window and the first window are in one-to-one correspondence in position to form a ray emitting window. The isolation piece made of the lead tetraoxide material is designed, the X-ray emission window is manufactured in a rubber sealing gasket mode, the ray shielding requirement is met, the oil sealing function is achieved, insulativity is good, and installation is easy. And meanwhile, the end cover mounting structure made of the lead tetraoxide material is adopted, so that the X-ray tube is convenient to assemble, and an insulation design is also adopted.

This application relates to the field of ceramic materials technology, specifically disclosing a ceramic material for PTC thermistors and its preparation method. The ceramic material for PTC thermistors includes the following raw materials: barium titanate, silane-modified alumina-coated lead tetroxide-silicon boride in-situ composite powder, rare earth oxides, alumina, ammonium polyacrylate, and polyvinyl alcohol. This application adds the silane-modified alumina-coated lead tetroxide-silicon boride in-situ composite powder to the ceramic material. The alumina directionally coats the lead tetroxide, effectively suppressing the volatilization of lead vapor during high-temperature sintering and improving the environmental friendliness of the ceramic material. Simultaneously, the in-situ composite bonding of lead tetroxide and silicon boride, combined with silane modification, improves the interfacial bonding ability between the composite powder and the barium titanate matrix, reducing internal stress during ceramic sintering and improving the mechanical properties of the ceramic material.