98 results about "Precipitated silica" patented technology

The invention belongs to the technical field of silicon dioxide delustering agents for coatings, and particularly relates to a preparation method of silicon dioxide for delustering paint with elastic hand feeling, which comprises the following steps: S1, preparing water glass and a sulfuric acid solution; s2, adding cationic and nonionic aqueous dispersants and a silane coupling agent into water glass, and then adding sulfuric acid to form silicon dioxide silica sol; s3, carrying out acid-base regulation, heating and boosting aging, aging generation and other steps to generate precipitated silicon dioxide; and S4, washing the precipitated silicon dioxide with pure water, an ammonium salt aqueous solution and pure water in sequence, drying, and carrying out wax powder treatment and crushing through a high-temperature jet mill to obtain the product. The silicon dioxide for delustering of the elastic paint has the advantages of large pore volume, small bulk density, small particle size, uniform distribution and easiness in dispersion, has the advantages of good delustering property and good hand feeling when being used in the elastic paint, and is easy to industrialize.

The present invention relates to a modified precipitated silica (MPS) comprising precipitated silica particles, polyethylene glycol and an antioxidant selected from certain hydroxyfuranones or phenolic derivatives. The invention also relates to a process for the manufacture of the MPS, to elastomer compositions comprising the MPS and to their use for the manufacture of semi-finished or finished articles, such as tire parts.

The invention discloses a method for preparing precipitated silicon dioxide for a heavy truck, and belongs to the technical field of silicon dioxide preparation, the method comprises the following steps: S1, selecting solid sodium silicate with modulus of 3.3-3.5, preparing a sodium silicate solution with concentration of 30-35 wt%, in the preparation process, firstly putting the solid sodium silicate into a crusher for crushing, and then putting the crushed solid sodium silicate into a stirrer for stirring; then adding the crushed solid sodium silicate into deionized water, stirring, and heating in the stirring process; the specific surface area of the target product is high and reaches 200-240 m < 2 > / g, the dispersion grade reaches 9.8 or above, meanwhile, the mechanical strength is remarkably improved, the tensile strength reaches 25 MPa or above, the 300% stress at definite elongation reaches 7.0 MPa or above, a two-step seed crystal method preparation process is adopted, the regularity of the microstructure of the product is higher, and the product has the higher surface area and higher mechanical performance.

The present disclosure provides methods and compositions of building materials for carbon sequestration. The compositions include magnesium oxide or magnesium hydroxide, a lime material comprising a calcium oxide and / or a calcium hydroxide; and a pozzolan comprising at least one material selected from the group consisting of ash (e.g., rice husk, coconut, ceramic), fly ash, vitrified calcium aluminio-silicate, blast furnace slag, ground granulated blast-furnace slag (GGBFS), zeolites, diatomaceous earth, silica fume, amorphous aluminosilicate, glass phase pozzolan, fume silica, metakaolin, calcinated diatomaceous earth, biochar, geopolymers, kaolinitic clays, volcanic ash, silica fume, pozzolanic lime, precipitated silica, carbon nanotubes, calcinated silicate pozzolan, synthetic pozzolan, pozzolan powders (e.g., glass, brick). The disclosure also provides methods for absorbing carbon dioxide using the disclosed building material.

The invention relates to a method for producing precipitated silica from plant ash, wherein the precipitated silica contains SiO2 and manganese in particulate form. The plant ash is used directly in the process, preferably without subjecting it to any pretreatment such as washing and / or incineration. The invention further relates to a precipitated silica containing SiO2 in particulate form and manganese, obtainable by the above process, and to the use thereof for producing filled elastomer compositions, tyre parts and / or tyres.

The invention belongs to the technical field of flame-retardant sponges, and discloses a carbonized flame-retardant chloroprene rubber sponge rubber plate with an open pore structure. Comprising 100 parts of chloroprene rubber, 4 parts of high-activity magnesium oxide, 5 parts of zinc oxide, 1 part of stearic acid, 0.5-1.5 parts of an accelerant DBTU, 1-1.5 parts of an accelerant ETU, 2 parts of an anti-aging agent, 3-5 parts of a foaming agent, 3-6 parts of a foaming promoter, 2-3 parts of PEG4000, 5-8 parts of a flame retardant TPP, 20-30 parts of zinc borate, 20-30 parts of antimony trioxide, 20-30 parts of a flame retardant, 10-15 parts of precipitated white carbon black and 15-20 parts of dibutyl phthalate. The foaming agent and the foaming aid are composed of a foaming agent H, urea ester and diethylene glycol. The advantages of chloroprene rubber are fused, flame-retardant auxiliaries including triphenyl phosphate, antimony trioxide, zinc borate, tris (2, 3-dibromopropyl) isocyanuric acid ester and triallyl isocyanuric acid ester are added, and the multiple auxiliaries have a synergistic effect to form a main flame-retardant action mechanism including heat absorption, dehydration, air isolation and rapid charring.

A precipitated silica having a low BET specific surface area according to the present invention has a total pore volume of 2.50 cm3 / g or more as measured by mercury porosimetry, a BET specific surface area of 15-35 m2 / g, a volume average particle diameter D500min of 2.0-25 μm in a particle size distribution of a slurry having 4 mass% of the precipitated silica, and a particle diameter change rate A of 0.50-0.90 as calculated by the following formula. Particle diameter change rate A = (D500min - D505min) / D500min. In the formula, the volume average particle diameter D505min is the volume average particle diameter in a particle size distribution when a ultrasonic treatment has been performed on the slurry having 4 mass% of the precipitated silica for 5 minutes. The precipitated silica according to the present invention exhibits excellent polishing properties in terms of polishing speed and smoothness of the polishing surface. The present invention further relates to a composition including the precipitated silica and a method for producing the precipitated silica.

Precipitated silica and method thereof The present disclosure provides a granular material having an average primary particle size of 80 nm to 140 nm and a BET surface area of ​​40 m 2 / g and an oil absorption of 160 to 250 cc / 100 g. The silica of the present invention can be prepared by the steps of: (a) dispersing colloidal seed particles having a primary particle size in the range of 40 to 100 nm, preferably 50 to 80 nm, in water; (b) adding an electrolyte at a concentration of 2.5 to 4.0 wt. % based on the total mass of the colloidal seed particles added in step (a); (c) heating the suspension to 65 to 100°C, preferably 85 to 95°C; (d) adding acid and silicate over a period of 60 to 180 minutes while maintaining the pH between 7.5 and 10, preferably between 8 and 9; and (d) adding 1.8 to 5.0% electrolyte based on the starting water amount during the acid and silicate addition (c). (e) stopping the addition of silicate; (f) adding acid until a pH of 3 to 6 is reached; (g) filtering, drying, and optionally grinding; It is produced by a method comprising: The precipitated silica of the present invention is used in cosmetics, anti-caking free / flow, food, carrier applications, dentifrices and mouthwashes.

The invention provides a damp-heat aging resistant three-layer waterproof adhesive tape as well as a preparation method and application thereof, and belongs to the technical field of waterproof adhesive tapes. The waterproof screen cloth comprises a screen cloth layer and a waterproof layer which are bonded through a bonding adhesive, the waterproof layer is coated with the TPU hot melt adhesive layer; the laminating glue comprises the following components in parts by weight: 95-105 parts of PU glue, 4-6 parts of precipitated silica, 8-12 parts of an isocyanate curing agent and 60-70 parts of butanone; the TPU hot melt adhesive layer is prepared from the following components in parts by weight: 45 to 60 parts of polyester polyol, 10 to 20 parts of polyether polyol, 20 to 25 parts of diphenylmethane diisocyanate (MDI), 5 to 10 parts of chain extender and the like. The adhesive tape solves the problems that the existing adhesive tape is poor in damp-heat aging resistance and the adhesive strength is easy to decrease by improving the formula of the laminating adhesive of the mesh cloth layer and the waterproof layer and the formula of the TPU hot melt adhesive layer, and has excellent damp-heat aging resistance, stable waterproofness and lasting adhesive strength.

The invention discloses precipitated silica with a large median particle size, which is used as a reinforcing filler in elastomer compositions, and a method for its manufacture.

The application discloses a kind of preparation of thermally stable hydrophobic modified fly ash and its application in high-temperature-resistant conveying belt, belong to solid waste high-value utilization and polymer composite cross field, the present application adopts medium resistance barrier discharge plasma to activate fly ash and then introduces phenyl trimethoxysilane to carry out in-situ graft modification, and constructs stable Si-O-Si and benzene ring π-π stacking covalent network coating layer, to obtain reinforcing agent with excellent thermal stability and superhydrophobicity.The modified fly ash can partially replace traditional precipitated silica, and improve the mechanical properties and anti-aging performance of high-temperature-resistant conveying belt.

A process for preparing a macroporous material comprising an active phase comprising a potassium phosphate salt and / or a cesium phosphate salt and a support comprising α-SiC silicon carbide and silica comprising the following steps: a) contacting a colloidal silica sol with a powder of a potassium and / or cesium phosphate salt to obtain a suspension; b) adding a powder of precipitated silica, a powder of α-SiC silicon carbide and a solvent to obtain a paste; c) shaping the paste to obtain a material precursor; d) drying the material precursor at a temperature between 15°C and 250°C; e) calcining the dried material precursor obtained at the end of step d) at a temperature above 250°C and below or equal to 1200°C.

A rubber composition contains at least one elastomer including at least one conjugated diene elastomer, a pre-silanized precipitated silica, a high surface area (e.g., CTAB surface area of at least 200 m2 / g) silica, a tear strength agent, a sulfur-based curing agent, and an accelerator for the curing agent. The rubber composition may be used to form tires.

The invention belongs to the technical field of titanium dioxide production waste resource utilization, and particularly relates to a method for synergistically preparing ammonium sulfate and white carbon black from sulfuric acid method titanium dioxide waste acid. According to the method, iron is pre-removed through precision filtration and low-temperature crystallization, most impurities and ferrous sulfate in the waste acid are removed, then the waste acid serves as a cheap acid source, white carbon black and ammonium sulfate are prepared, all-component utilization of the waste acid is achieved, sulfuric acid in the waste acid is used for preparing white carbon black and ammonium sulfate, iron ions are recycled into ferrous sulfate heptahydrate, the resource utilization rate is larger than or equal to 98%, and the cost is low. And the problem of waste acid discharge is thoroughly solved, and the fundamental transformation from tail end treatment to source recycling is realized. Moreover, the steps of pre-treatment and iron pre-removal ensure high whiteness and low impurity content of the white carbon black, and meet high-end application requirements. Meanwhile, the purity and color of the ammonium sulfate product are also ensured. And 800-1000 yuan benefits can be additionally created for each ton of waste acid, so that direct and considerable benefits are brought to titanium dioxide production enterprises.

The invention relates to a method for producing precipitated silica from plant ash. The plant ash is used directly in the process, preferably without subjecting it to any pretreatment such as washing and / or incineration. The invention further relates to precipitated silica obtainable by said method and to the use thereof for producing filled elastomeric compositions or tyre parts and / or tyres.

The subject of the present invention is a compound having the following physicochemical parameters: CTAB surface area ≦115 m 2 / g, DOA≧130ml / (100g), Ro-Tap>300μm≧86%, V(d5-d50) / V(d5-d100)<0.66. The precipitated silica is produced by a) charging an aqueous solution of organic and / or inorganic salts and / or alkali metal or alkaline earth metal silicates and / or organic and / or inorganic bases having a pH of ≥ 9, b) simultaneously adding water glass and an acidifying agent to this charge with stirring at 80-98°C for 60-120 minutes, c) then stopping the addition of water glass and adding only the acid in smaller amounts than before so that the pH of the mixture (measured at 60°C) is 9.0-10.0, d) then stirring the mixture at an elevated temperature of > 85°C for 45-200 minutes, but without adding any further starting materials, e) acidifying with sulfuric acid to a pH of about 3.5-4.5 (measured at 60°C), f) filtering, drying to loss on drying < 8%, and then granulating. The silica according to the invention can be used in the production of rubber compounds, in particular for the production of tires, cable sheaths, hoses, drive belts, conveyor belts, roller covers, shoe soles, sealing elements and cushioning elements.

The application provides high-reinforcing and high-dispersing silicon dioxide as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a water glass solution and sulfuric acid to obtain a first reaction solution; adding sulfuric acid to the first reaction solution at a first dropping speed, and adding the water glass solution at the same time to obtain a second reaction solution; adding sulfuric acid to the second reaction solution at a second dropping speed, and adding the water glass solution at the same time to obtain a third reaction solution; adding sulfuric acid to the third reaction solution at a third dropping speed, and adding the water glass solution at the same time to obtain a fourth reaction solution; and adjusting the pH of the fourth reaction solution to obtain a precipitated silicon dioxide suspension. The application realizes high-reinforcing performance of the precipitated silicon dioxide, and also has excellent dispersing performance by optimizing the preparation process and regulating the material structure, so as to meet the demand of the market for high-performance materials.

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 invention discloses a composition for cleaning an open mill roller and a production process thereof, and belongs to the technical field of rubber, the composition comprises the following raw materials by weight: 95-100 parts of ethylene propylene diene monomer, 30-40 parts of fumed silica, 15-20 parts of precipitated silica, 10-15 parts of alumina, 5-8 parts of zinc oxide, 4-6 parts of composite coating functional powder, and 1-3 parts of stearic acid. According to the mode, in the preparation process of the composite coating functional powder, the carboxymethyl chitosan is subjected to chlorogenic acid modification, meanwhile, the coarse carbon dots are subjected to functional N-isopropylacrylamide modification, and a synergistic gain effect is achieved for improving the wear resistance, the working stability and the pollutant removal rate of the prepared composition.

The invention relates to peroxide compatible heat-treated precipitated silica and a method of making the same. The invention also relates to the use of peroxide compatible silica in oral care formulations, in particular to improve the whitening performance of the toothpaste by controlling the time of peroxide decomposition in the toothpaste formulation.

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.

A rubber composition which comprises a diene elastomer, a first silica which is a precipitated or pyrogenic silica and which has a BET specific surface of greater than 100 m2 / g as reinforcing filler, a second silica which is a microsilica with a BET specific surface of less than 50 m2 / g, a silane coupling agent and a crosslinking system is provided. The contents of the first silica and of the second silica are expressed as part by weight per hundred parts of elastomer, phr, and respectively denoted T1 and T2. T1 is greater than 15 phr and less than T2, and the sum of T1 and of T2 are greater than 75 phr. The rubber composition exhibits an increased hysteresis potential, which makes it possible to improve the wet grip performance qualities of a tread of a tire containing such a rubber composition.

Provided herein is a process for producing a precipitated silica from a plant ash, wherein said precipitated silica contains SiO2 in particulate form and manganese. Also provided herein is a precipitated silica obtainable by the above process and 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.

This invention discloses a method for the integrated recycling and utilization of lithium phosphate aluminum ore extraction waste residue coupled with phosphate chemical industry. The method includes: reacting fluorosilicic acid, a byproduct of phosphate chemical industry, with ammonia water for ammoniation; refining the filter residue from solid-liquid separation into precipitated silica for recovery; and preparing the filtrate for recycling. The lithium phosphate aluminum ore extraction waste residue is reacted with dilute sulfuric acid, and solid-liquid separation is performed to remove acid-insoluble substances, yielding an acidified solution. The filtrate and acidified solution are mixed and reacted to obtain AlF3 precipitate. After solid-liquid separation, the AlF3 precipitate is further refined to remove impurities such as iron and phosphorus, yielding AlF3. The sulfuric acid phosphoric acid filtrate is added to ammonia water for ammoniation and neutralization to obtain sulfuric acid ammonium slurry. After concentration and drying, fertilizer containing NH4H2PO4+(NH4)2SO4 is produced. This invention features a simple process flow, achieving the industrial-scale integrated utilization of fluorine, silicon, phosphorus, and aluminum elements in the waste residue and byproducts in one step. It provides a new and efficient approach for the comprehensive recycling and utilization of lithium phosphate aluminum ore extraction waste residue for lithium phosphate aluminum ore extraction enterprises and wet-process purified phosphoric acid production enterprises, resulting in significant economic and social benefits.

The invention relates to a precipitated silica, characterized in that it has the following physico-chemical parameters: The precipitated silica according to the invention is produced by the following method: a) initial charge of an aqueous solution of organic and / or inorganic salts and / or alkali and / or alkaline earth silicates and / or organic and / or inorganic bases with pH > 9, b) simultaneous metering of water glass and acidifying agent to this initial charge while stirring at 80 to 98°C for 60 to 120 minutes, c) then stopping the addition of water glass and metering the acid only in smaller amounts than before in order to bring the pH of the mixture (measured at 60°C) to 9.0 to 10.0, d) then stirring the mixture at high temperature > 85°C for 45 minutes to 200 minutes without further addition of reactants, e) acidification using sulfuric acid to a pH of about 3.5 to 4.5 (measured at 60°C) and f) filtration, drying to < 8% loss on drying and then granulation of the mixture. The silica according to the invention can be used for the production of rubber mixtures, in particular for the production of tyres, cable sheaths, hoses, drive belts, conveyor belts, roller coverings, shoe soles, gasket elements and damping elements.

A modified silica comprising organic molecules absorbed on the surface of a precipitated silica is provided. The modified silica is particularly suitable for use as filler in elastomeric mixtures as it provides improvement in the processing of the silica / elastomer mixtures. A process for preparing the precipitated silica is also provided.

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.

A rubber composition contains at least one elastomer including at least one conjugated diene elastomer, a pre-silanized precipitated silica, a high surface area (e.g., CTAB surface area of at least 200 m2 / g) silica, a tear strength agent, a sulfur-based curing agent, and an accelerator for the curing agent. The rubber composition may be used to form tires.

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 use of porous colloidal or precipitated silica particles in the treatment of wort is described, wherein the porous silica particles have a water content of 30% by weight or less and a pore volume of 0.4 ml / g or greater. Methods of treating wort and methods of making a beverage are also described.