16 results about "Precipitated silica" patented technology

The utility model discloses a kind of synthesis device for continuously preparing precipitated silica, including control pipe and synthetic pipeline, the control pipe one end is equipped with synthetic water import, the control pipe other end is connected with synthetic pipeline one end, the synthetic pipeline other end is equipped with silica suspension outlet, the synthetic pipeline is formed by the combination of several synthesis tubes in series or parallel, the synthesis tube includes charging pipe, reaction tube and sampling tube, the reaction tube is between charging pipe and sampling tube, particle size filter plate is equipped between charging pipe and reaction tube and between reaction tube and sampling tube;The synthesis device for continuously preparing precipitated silica of the utility model can continuously synthesize precipitated silica, the device structure is simple, and can be set outdoors;And by the selection of the number of synthesis tube and particle size filter plate, different pore volume, particle size requirement of silica can be synthesized, and particle size distribution is controlled in relatively narrow distribution range.

The application relates to the field of silica preparation, and particularly discloses a preparation method of precipitated silica with low hydroxyl content, wherein solid sodium silicate with a modulus of 3.0-3.5 is selected, a water glass solution with a concentration of 15-20 wt% is prepared, and sulfuric acid with a concentration of 18-25 wt% is prepared as an acidifying agent; SO2, calcium hydroxide is added into the prepared sodium silicate solution, impurity removal and purification treatment are carried out, and after standing and filtering, the purified sodium silicate solution which can be used for reaction is obtained. Through precise control of the reaction conditions, the parameters such as acid-base flow rate, reaction temperature and pH in different reaction stages are controlled, the surface hydroxyl content of the target product is significantly reduced, and before preparation, the impurity-removed water glass solution is obtained by taking calcium hydroxide as a sodium silicate purifying agent, so that the purity of the reaction product is higher, and when the reaction product is used for rubber mixing, the reaction product is not prone to agglomeration and thickening.

This utility model discloses a silica production system, comprising an ultrasonic vibrating screen; the material oversizes the ultrasonic vibrating screen is fed into a pulverizer via a chute, and an iron remover is installed above the chute; the material undersizes the ultrasonic vibrating screen falls into a deacidification furnace via a pipe, and the discharge port of the deacidification furnace is connected to a drying furnace; the discharge port of the pulverizer is connected to the inlet of the deacidification furnace via a pipe. Advantages: Under the action of the ultrasonic vibrating screen, small particles fall under the screen, while large agglomerated particles and metallic iron impurities are intercepted on the screen. During the process of being conveyed along the chute, the metallic iron impurities are adsorbed and removed by the iron remover. Large particles fall into the pulverizer, are pulverized, and then enter the deacidification furnace for deacidification treatment before entering the drying furnace for drying. This utility model can effectively remove metallic iron impurities and large agglomerated particles from the product, ensuring the quality of the produced silica.

The present disclosure relates to precipitated silicas having a mean primary particle size of greater than 80 nm, a BET surface area of less than 40 m2 / g, and an oil absorption of above 160 cc / 100 g. The silica is produced by a process that includes (a) dispersing colloidal seed particles ranging in primary particle size from 40-100 nm, preferably 50-80 nm, in water, (b) adding an electrolyte in a concentration of 2.5-4.0 wt.-% based on the total mass added in (a), (c) heating the suspension to 65-100° C., preferably 85-95° C., (d) adding an acid and silicate while maintaining a pH of between 7.5-10, preferably 8-9, for 60-180 minutes, (e) stopping the addition of silicate, (f) adding an acid until a pH of 3-6 is reached, (g) filtering, drying, and optionally milling. The precipitated silica is used in cosmetics, anti-caking free / flow, food, carrier applications, dentifrice, and mouthwash.

The utility model discloses a cooling device for production of precipitated silica rubber, including cooling water tank, the left side fixedly connected with the adjusting frame in cooling water tank, the below rotationally connected with the fixed roll in the inside of adjusting frame, the front and back of fixed roll surface all are fixedly connected with several even distribution's spoiler, the top of adjusting frame is equipped with the round tank, and the inside fixedly connected with the rustproof nut seat of round tank, the inside screw thread connection of rustproof nut seat has the rustproof bolt, the bottom rotationally connected with the moving plate of adjusting frame inside of rustproof bolt. The utility model discloses the setting can guide the silicon rubber after cooling of the conveyer frame, and first wiper strip and second wiper strip can scrape the silicon rubber surface most cooling water, make it return to the cooling water tank, reduce the cooling water loss and splash problem, the air drying fan in the cover shell can further dry the silicon rubber surface residual moisture, and the subsequent production operation is convenient.

Spherical, low surface area precipitated silicas are useful as matting agents in powder coatings. Corresponding matte powder coating compositions and methods of preparing matte powder coatings containing the silicas are provided.

This invention relates to the field of silica preparation technology, specifically to a method for preparing precipitated silica. The method involves using the mother liquor from the filtration process during precipitated silica production as both a dispersant solution and a reactant diluent, adding it simultaneously to the reaction system along with other reactants. During the reaction, sodium sulfate is continuously compensated at a gradient to adjust its concentration within a predetermined range, thereby controlling the ratio of product concentration to dispersant solution concentration during the reaction process. This results in a high-performance precipitated silica product with better dispersibility and transparency in rubber systems. The silica produced by this invention achieves a balanced control of the ratio of dispersant sodium sulfate (Na2SO4) concentration to product concentration at different time points in the reaction process, while the concentration of the synthesis reaction product continuously increases with reaction time. Comparative analysis of materials at different time points during the reaction process reveals that the particle size distribution of the precipitated silica product obtained from the secondary polymerization of primary silica particles is significantly improved compared to existing technologies, with a greatly enhanced uniformity in particle size distribution.

The present invention relates to a process for the preparation of silicates, preferably alkali silicates, from spent foundry sand using a hydrothermal route, comprising the step of reacting said spent foundry sand with a base, preferably an alkali hydroxide, in an aqueous reaction medium, wherein the process does not comprise any thermal pre-treatment step as applied in prior art processes. The present invention also relates to a process for the preparation of precipitated silica using said silicates.

This invention belongs to the field of silicone rubber technology and relates to a flame-retardant compounded silicone rubber and its preparation method. The invention involves first adding methyl vinyl silicone rubber raw material, precipitated silica, hydroxyl silicone oil, zinc stearate, silane coupling agent, and composite flame-retardant filler to a kneader for kneading. After kneading, heat treatment, and cooling, compound A is obtained. Then, compound A is mixed evenly with a platinum-containing flame-retardant additive in a specific ratio on a two-roll mill to obtain the flame-retardant compounded silicone rubber. The platinum-containing flame-retardant additive is a compound of platinum compound and vinyl amino silicone oil at a mass ratio of 1:0.5~1. This method is simple, and the prepared compounded silicone rubber has high flame-retardant properties. It utilizes a combination of platinum compound, nitrogen-containing organic compound, and composite flame-retardant filler, resulting in a strong synergistic flame-retardant effect. It also offers advantages such as good roller workability, high processing efficiency, and minimal yellowing of vulcanized samples, making it easy to promote and apply.

This invention discloses a fingerprint development reagent based on natural AIE compounds and precipitated silica, its preparation method, and its application, belonging to the field of forensic identification technology. The reagent is a particulate suspension comprising precipitated silica, natural AIE compounds, a surfactant, and a solvent. During preparation, the surfactant is dissolved in the solvent, the natural AIE compound is added and dissolved, and then precipitated silica is added in batches with stirring to obtain a uniform and stable suspension. This invention uses naturally derived AIE active substances, which are non-toxic, environmentally friendly, and low-cost, avoiding the biotoxicity and complex preparation process of traditional synthetic dyes. It also effectively solves the problems of dust pollution and poor compatibility with moist objects in powder development methods. It achieves high-contrast, high-definition fluorescence development of latent fingerprints on both dry and moist, non-permeable surfaces. The preparation process is simple and controllable, easy to scale up, and has good application prospects in rapid on-site detection fields such as criminal investigation and forensic identification.

The invention relates to a process for producing a precipitated silica from a plant ash, wherein said precipitated silica contains SiO2 in particulate form and manganese. The plant ash is directly employed in the process, preferably without being subjected to any pre- treatment such as washing and / or incinerating. The invention further concerns a precipitated silica (obtainable by the above process) containing SiO2 in particulate form and manganese and its use for the manufacture of a filled elastomeric composition, a tire part and / or a tire.

It is provided a process for producing sodium silicate comprising the steps of pretreating residual SiO2 silica; homogenizing the pretreated residual SiO2 silica with a mixture of H2O-NaOH producing a mixture of NaOH / SiO2; heating the mixture of NaOH / SiO2; obtaining a sodium silicate (Na2O)x(SiO2)y; diluting the sodium silicate (Na2O)x(SiO2)y in water producing a sodium silicate diluted solution (Na2O)x(SiO2)y; filtering the diluted solution (Na2O)x(SiO2)y to remove impurities.

Precipitated silicas having, a N-cetyl-N,N,N-trimethylammonium bromide (CTAB) surface area ≤115 m2 / g, a dioctyl adipate (DOA) absorption ≥130 ml / (100 g), a RoTap for >300 μm of ≥86%, and a pore volume distribution of V (d5−d50) / V (d5−d100)<0.66. A method of producing the precipitated silicas.

This disclosure relates to a microporous membrane in sheet form, comprising a polyolefin substrate and precipitated silica distributed throughout the substrate. The membrane contains 55 to 80% by weight of precipitated silica, the precipitated silica having a density greater than 9000 μm. 2 / 100g membrane surface area. The membrane exhibits a Gurley porosity of 350 to 6000 seconds, and when wetted by a liquid with a refractive index of 1.400 to 1.550, the membrane exhibits greater translucency than when it is not wetted. An apparatus is also provided comprising: a reservoir configured to contain a liquid and including a vertical surface visible to a user; and the aforementioned microporous membrane, which constitutes at least a portion of the vertical surface visible to the user. One side of the membrane is in contact with the liquid, and thus provides an indication of the liquid level within the reservoir.

This invention relates to a method for preparing precipitated silica and calcium carbonate from yellow phosphorus slag. The method includes: pulverizing the yellow phosphorus slag and adding it to a mixture of water, ammonium chloride, an extractant, and a polar organic solvent; heating the mixture to boiling point while collecting the released ammonia gas; separating the solid and liquid phases of the reaction liquid to obtain a calcium chloride solution and a silicon-containing solid residue; washing, drying, calcining, and pulverizing the silicon-containing solid residue to obtain precipitated silica; contacting the calcium chloride solution with the collected ammonia gas and added carbon dioxide to undergo carbonation and amination reactions, generating calcium carbonate precipitate and regenerating ammonium chloride; and recycling the ammonium chloride solution. This invention uses yellow phosphorus slag as raw material and achieves efficient separation of silicon and calcium through the synergistic effect of the extractant and the polar organic solvent, simultaneously preparing high-purity precipitated silica and high-yield calcium carbonate. Furthermore, the ammonium chloride can be recycled, resulting in low production costs and no secondary pollution, providing a new approach for the high-value utilization of yellow phosphorus slag.