365 results about "Calcium silicate hydrate" patented technology

A hydraulic cement for biomedical applications. The cement sets in-situ, hardening when exposed to water to produce nano-dispersed composite of calcium-silicate-hydrate gel mixed with hydroxyapatite. In comparison with prior cements, the composition provides high biocompatibility, high bioactivity and high biomechanical strength, due to the composite structure of the calcium silicate hydrate reinforced with co-precipitated particles of hydroxyapatite. Biocompatibility is also increased due to an absence of aluminum and magnesium in the composition. The cement is suitable for variety of applications, including dental implants, bone fixation, and bone repair.

A method and apparatus for the production of calcium carbonate and calcium silicate in common superatmospheric reactors. Multiple reactors can be provided for switching production between reactors, and advantageously utilizing process waste heat. On site production of both PCC and Calcium Silicate Hydrates is thus achieved in a paper mill.

The invention provides a curing agent and a curing method for heavy metals in fly ash from mswi (municipal solid waste incineration). The curing agent comprises an aluminum-rich high-silicon material and an alkaline exciting agent, wherein the mass of the aluminum-rich high-silicon material is 15% to 25% of the mass of the fly ash from mswi; the mass of the alkaline exciting agent is 3% to 5% of the mass of the fly ash from mswi. The curing agent adopts industrial waste residues, and raw materials are cheap and easy to obtain; according to the curing method, lots of calcium oxide, chloride and sulfide existing in the fly ash from mswi have a hydration reaction with the aluminum-rich high-silicon material to generate a C-S-H (calcium silicate hydrate), Friedel (calcium chloroaluminate) phase and Aft (ettringite) phase system; during the formation process of the mineral system, a solid solution is formed through ion exchange, a new phase is formed through coprecipitation, and a relatively strong stable constraint effect can be played on heavy metals through physical adsorption and coating, so that wastes can be treated by using wastes, and harmless treatment of the fly ash from mswi and resource utilization of the industrial waste residues are realized.

The invention discloses a calcium silicate hydrate gel solution early strength agent and a preparation method thereof, and relates to the technical field of construction material production. The early strength agent and the method are used for solving problems of complicated preparation process, high cost, storage difficulty, and poor early strength effect of traditional calcium silicate hydrate powder. The calcium silicate hydrate gel solution early strength agent comprises a calcareous material, a siliceous material, a gel dispersant, and water. A weight ratio of the calcareous material to the siliceous material is 0.3-3:1. A weight ratio of water to the total of the calcareous material and the siliceous material is 5-30:1. The mass percentage of the gel dispersant is 0.1-2.0%. The preparation method of the early strength agent comprises the following steps: reaction materials are weighed; a sodium silicate water solution and a calcium nitrate water solution are respectively prepared; the two are mixed and are subjected to a reaction, such that a gel mixture solution is obtained; suction filtration is carried out; and water and the dispersant are added for re-dispersion. The early strength agent is uniform and stable, and is convenient to store. The early strength agent is highly convenient to use, and has a good early strength effect. With the early strength agent, an alkali-aggregate reaction risk can be effectively reduced.

The invention discloses a calcium silicate hydrate gel solution early strength agent and a preparation method thereof, and relates to the technical field of construction material production. The early strength agent and the method are used for solving problems of complicated preparation process, high cost, storage difficulty, weighing difficulty, and poor early strength effect of traditional calcium silicate hydrate powder. The calcium silicate hydrate gel solution early strength agent comprises a calcareous material, a siliceous material, a gel dispersant, and water. A weight ratio of the calcareous material to the siliceous material is 0.3-3:1. A weight ratio of water to the total of the calcareous material and the siliceous material is 5-30:1. The mass percentage of the gel dispersant is 0.01-0.50%. The preparation method of the early strength agent comprises the following steps: reaction materials are weighed; a sodium silicate water solution and a calcium nitrate water solution are respectively prepared; the gel dispersant is respectively added into the solutions; and the two solutions are mixed and allowed to react for a certain period of time. The early strength agent is convenient to store, transport and weigh, and have good product stability. With the early strength agent, cement-based material early strength can be effectively improved.

A hydraulic cement comprising a calcium silicate and at least one phosphate compound. The phosphate compound is included in an amount sufficient to react a major portion of the calcium hydroxide that is produced during hydration of the cement to hydroxyapatite or other calcium phosphates. The phosphate compound is preferably a mono-calcium phosphate. The cement is useful in both bio-medical/dental and engineering applications. The calcium hydroxide is reacted by the phosphate to form hydroxiapatite or other calcium phosphate that is co-precipitated with the calcium silicate hydrate to form a composite-like structure on a nano-scale level. The reduced calcium hydroxide content in the set cement increases its strength and reduces its pH. The hydroxiapatite content and the reduced pH render the cement bio-active and suitable for use in medical and dental implants, for example, for replacement bone and tooth material. Due to its high strength, the cement may also be used for structural/engineering applications.

A premixed cement paste for use in medical or dental applications. The premixed cement paste remains fluid when stored in a hermetically sealed condition, but hydrates and hardens to set when placed in a physiological environment. The cement paste includes at least one calcium silicate compound and at least one substantially water-free liquid carrier mixed with the at least one calcium silicate compound; the substantially water-free liquid carrier avoids hydration of the mixture during storage, but undergoes exchange with aqueous physiological solutions so that the cement past hydrates and hardens to set when placed in a physiological environment. The paste may be placed in the physiological environment by injection, for example. The at least one calcium silicate compound may be, for example, calcium silicate, dicalcium silicate, tricalcium silicate, or mixtures thereof. The substantially water-free liquid may be, for example, ethylene glycol, polyethylene glycol, liquid glycerol, glycerin, ethyl alcohol, vegetable oil, animal oil, silicon oil, hydroxypropyl methylcellulose, or mixtures thereof. The substantially water-free liquid carrier preferably includes water in an amount less than about 20% by weight percent of the paste. The paste may include a secondary phase for enhanced properties, such as, for example, a fibrous or particulate material for enhanced mechanical properties, biodegradable or soluble materials that provide room for bone in-growth, bioactive materials such as antibiotics that elute into the physiological environment from the set cement, and radio-opaque materials that enhance X-ray imaging of the cement.

The invention relates to the field of building construction materials, in particular to a concrete crack grouting repairing material prepared from calcium silicate hydrate crystal seed powder and a use method of the material.The concrete crack grouting repairing material is prepared from ordinary Portland cement, the calcium silicate hydrate crystal seed powder, hydroxymethyl cellulose ether, dispersible adhesive powder, gypsum, a naphthalene sulfonated formaldehyde condensate water reducing agent, limestone powder and alunite.The concrete crack grouting repairing material can be used for rapidly repairing concrete cracks of a building structure, and therefore the mechanical property and durability of the concrete structure are improved, and the service life of the building is prolonged.The concrete crack grouting repairing material is suitable for repairing of cracks of concrete structures such as reinforced concrete structures, concrete pavements, bridges and water conservancy projects.

The invention relates to a halogen-free environmentally-friendly non-combustible magnesium oxide-magnesium sulfate inorganic composite material. The halogen-free environmentally-friendly non-combustible magnesium oxide-magnesium sulfate inorganic composite material comprises 20 to 60 parts of magnesium oxide, 30 to 80 parts of a magnesium sulfate solution having mass concentration of 20 to 70%, 0 to 20 parts of heat insulation material powder and 0.5 to 3 parts of an additive F802, wherein the heat insulation material powder comprises alumina silicate powder, calcium silicate powder, glass powder, quartz powder, bead powder, cenosphere powder, mica powder, gypsum powder, meerschaum powder, attapulgite powder, pearlite powder and one or more of other powdery refractory materials. The halogen-free environmentally-friendly non-combustible magnesium oxide-magnesium sulfate inorganic composite material can be prepared into a halogen-free environmentally-friendly non-combustible magnesium oxide-magnesium sulfate inorganic composite plate or a fireproof, heat insulation and sound insulation foamed plate. The halogen-free environmentally-friendly non-combustible magnesium oxide-magnesium sulfate inorganic composite material does not get damp and produce a helogenation phenomenon in a wet weather, and has stable fire-resistance and high strength. A plate prepared from the halogen-free environmentally-friendly non-combustible magnesium oxide-magnesium sulfate inorganic composite material does not get damp and produce a helogenation phenomenon in a wet weather, has stable fire-resistance, high strength, a long service life, a simple structure and good secondary processing performances, is convenient for decoration, and can be utilized as a safe and environmentally-friendly building plate having wide use prospects.

The invention provides a concrete seal curing agent which comprises the following components in percentage by weight: 50%-70% of silicate, 10%-30% of a silane coupling agent, 1%-3% of nano titanium dioxide and the balance of water. After the concrete seal curing agent provided by the invention is applied to the surface of a concrete structure, silicate in the concrete seal curing agent can quickly permeate into concrete and reacts with free calcium to generate insoluble amorphous calcium silicate hydrate so as to block the fine pores of the concrete structure and improve the hardness of the concrete structure; meanwhile, the silane coupling agent and nano titanium dioxide in the curing agent interact to form a hydrophobic membrane layer on the surface of the concrete structure and improve the surface hydrophobicity of the concrete structure; the experimental result shows that the surface Mohs hardness is higher than 7, the water absorption rate is lower than 0.6%, and the liquid drop contact angle is less than 95 degrees after the surface of the concrete structure is coated with the concrete seal curing agent provided by the invention.

The invention relates to light offset paper filled with synthetic calcium silicate and a manufacturing method thereof. The manufacturing method of the light offset paper includes the process of taking chemical softwood pulp and poplar PRC-APMP pulp as paper pulp raw materials, taking synthetic calcium silicate as filling material and then manufacturing the light offset paper with pulp. The produced light offset paper provided by the invention has high bulk, high opacity, no luster on the surface, excellent finishing and simple manufacturing technique, and filling material can be effectively added; and meanwhile, the calcium silicate filling material used in the invention comes from waste material of power plants, so that the manufacturing cost is reduced, and an output way with high added value is provided for the plenty of discharged fly ash in power plants.

The invention provides a premixed calcium silicate based root canal filling material with suspension stability as well as a preparation method and an application thereof. At least one calcium silicate compound is used as a main phase, and at least a second phase for improving solidification performance, at least one nonaqueous phase solvent which can be mixed with water, at least one suspension stabilizing agent and at least one radiopaque material are added in order to prepare the root canal filling material with excellent injectable performance. An inorganic dispersant with suspension stabilizing effect is added into the premixed type calcium silicate based root canal filling material system, based on reservation of excellent biological compatibility, biological activity, marginal sealability, and the like of the calcium silicate material, layering, deposition or flocculation of the premixed system are effectively prevented, long-term dispersion stability of the premixed paste is improved, and the material can be used as a filling material for dental pulp capping, root canal therapy, and other dental restoration fields.

The invention relates to a calcium silicate material prepared from waste ceramic powder. The material comprises the following raw materials in part by weight: 35 to 70 parts of waste ceramic powder, 0 to 35 parts of other siliceous raw materials, 35 to 55 parts of calcareous raw material, 0 to 15 parts of reinforcing fiber and 0 to 10 parts of Portland cement, wherein the other siliceous raw materials are one or more of quartz powder, diatomite and mica. The calcium silicate material has the following advantages that: the waste ceramic powder is used for gradually replacing the primary siliceous raw material in the raw materials for producing the calcium silicate material; the cost is saved and environmental protection and quality stability are ensured; and the produced calcium silicate material can be used as gas filling blocks, calcium silicate boards or exterior wall bricks or as a porous carrier material.

The invention provides a novel, steam-assisted production methodology and associated compositions and methods of use in the manufacture of carbonatable or non-carbonatable metal silicate or metal silicate hydrate (e.g., calcium silicate or calcium silicate hydrate) compositions. These metal silicate compositions and related phases are suitable for use hydraulic, partially hydraulic or non-hydraulic cement that sets and hardens by a hydration process, a carbonation process or a combination thereof, and may be applied in a variety of concrete components in the infrastructure, construction, pavement and landscaping industries.

The invention discloses an environment-friendly high-strength water-resisting and mildew-resisting adhesive for a plywood and a preparation method of the environment-friendly high-strength water-resisting and mildew-resisting adhesive. The environment-friendly high-strength water-resisting and mildew-resisting adhesive is prepared from the following raw materials including polyvinyl alcohol, cassava starch, dibutyl phthalate, sodium pyrosulfite, tannic acid, jade powder, calcium silicate hydrate, asbestos powder, p-hydroxybenzoic acid hydrazide, diammonium hydrogen phosphate, hydroquinone, sodium diethylhexyl sulfosuccinate, triethyltin chloride, phenyl mercury oleate, borax and the like. The polyvinyl alcohol and the cassava starch are subjected to a cross-linking reaction so that crystallization degrees of the polyvinyl alcohol and the cassava starch are reduced and a new cross-linking structure is formed, and furthermore, the thermal stability of the adhesive is improved; the borax is added and the polyvinyl alcohol and the starch can be subjected to further cross linking, so that the cross-linking degree and the initial viscosity of the adhesive are improved, and furthermore, the water resistance and the bonding force of the adhesive can be improved; the triethyltin chloride, the phenyl mercury oleate, the p-hydroxybenzoic acid hydrazide and the like are added so that the mildew-resisting capability of the plywood can be improved.

The invention relates to an ardealite-based self-leveling material. he ardealite-based self-leveling material consists of the following materials in parts by weight: 40-80 parts of modified ardealite, 6-15 parts of semi-hydrated gypsum, 20-30 parts of admixture, 1-4 parts of re-dispersible latex powder, 0.10-0.30 part of a retarder, 0.20-1.0 part of a water reducer, 0.10-0.25 part of a water-retaining agent, 0.06-0.15 part of an antifoaming agent and 0.10-0.40 part of an air entraining agent. The ardealite-based self-leveling material has the beneficial effects that firstly, the waste utilization rate is high; secondly, the modifying process of the ardealite is high and the energy consumption is low; and thirdly, the performances of the self-leveling gypsum are improved by virtue of a reasonable proportion of various wastes, for example, CSH (Calcium Silicate Hydrate) phase can be generated by ardealite, carbide slag and coal ashes, so that the water resistance is effectively improved. Therefore, the ardealite-based self-leveling material had dual characteristics of circulation economy and low-carbon economy, and can be extensively applied to an industrial building and a civil building.

The invention discloses a bioactive multilayer multiphase ceramic microsphere material and its preparation method and use. The bioactive multilayer multiphase ceramic microsphere material comprises multilayer microspheres obtained by alternate wrapping of beta-tricalcium phosphate and calcium silicate respectively doped with foreign ions. The preparation method comprises the following steps of respectively dispersing the beta-tricalcium phosphate and calcium silicate powder respectively doped with the foreign ions into alginate hydrosol to obtain two types of paste, putting the two types of paste respectively into liquid storage tanks connected to two layers of coaxial tubular nozzles, synchronously injecting the paste in the liquid storage tanks to outlets of the two layers of coaxial tubular nozzles to obtain concentric multilayer paste liquid drops, and receiving the concentric multilayer paste liquid drops by an inorganic calcium salt aqueous solution, and carrying out drying and calcination. The bioactive multilayer multiphase ceramic microsphere material has the fast-slow alternative degradation rate characteristic in the normal liquid, and can release an inorganic ion composition with layer-by-layer degradation. Granularity, each-layer thickness and an inorganic ion release rate of the bioactive multilayer multiphase ceramic microsphere material can be controlled easily. The bioactive multilayer multiphase ceramic microsphere material can be used for bone defect repair and bone regeneration medical science.

The invention provides an ultrathin calcium silicate nanosheet with an ultrahigh specific surface area and a preparation method thereof. According to the ultrathin calcium silicate nanosheet with the ultrahigh specific surface area, the mole ratio of calcium to silicon is 0.4-1.5, the BET specific surface area is 200-550m<2>/g, and the thickness of the nanosheet is 1-10nm. The ultrathin calcium silicate hydrate nanosheet and an ultrathin non-crystal water calcium silicate nanosheet prepared by the method are uniform in shape and size and ultrathin in thickness, and the specific surface areas of the ultrathin calcium silicate hydrate nanosheet and the ultrathin non-crystal water calcium silicate nanosheet are larger than those of other calcium silicate nanosheets. Compared with the other methods in the prior art, the method provided by the invention has the advantages that the prepared ultrathin calcium silicate hydrate nanosheet and the prepared ultrathin non-crystal water calcium silicate nanosheet are very large in specific surface area, can be used as drug carriers, have extremely high drug loading capacity and good drug slow release performance on drugs difficult to dissolve in water, have the extremely strong capability of absorbing protein and heavy metal ions, and have a good application prospect in the fields of biological medicine and water treatment.

An aqueous permeable concrete sealing and curing agent is composed of the following components in percentage by weight: 75 to 95 wt% of silicate, 0.1 to 1.5 wt% of penetrating agent, 0.1 to 1.0 wt% of promoter, 0.1 to 2.5 wt% of waterproof agent, and the balance being water. The aqueous permeable concrete sealing and curing agent can be diluted by water according to the situation of concrete base material; diluted agent can be sprayed or painted on the surface of concrete structure, the active components can penetrate to a depth of 2 to 8 millimeters in concrete under the effect of promoter; the active components can react with calcium hydroxide crystals in concrete to generate calcium hydroxide hydrate gel, which can fill and enclose the pores in concrete, thus the strength and wear resistant performance of concrete pavement are largely improved, the phenomenon of ash generation and sand generation is avoided, and the anti-permeability and stain resistant properties of pavement are prominently improved.

Process for the preparation of a sprayable hydraulic binder composition containing as main components water, aggregates, hydraulic binder, set accelerator, characterized in, that a calcium silicate hydrate (C—S—H) containing component is added before and/or at the spray nozzle.

The invention discloses a preparation method of a composite nano-fiber support material of silk fibroin and calcium silicate. The method comprises the following steps: preparing the silk fibroin; preparing calcium silicate nanometer whiskers; mixing a solvent, the silk fibroin and the calcium silicate nanometer whiskers to obtain spinning solution; and finally carrying out electrostatic spinning and postprocessing to obtain the composite nano-fiber support material. In the invention, composite fiber with a nanometer number grade is prepared based on the electrostatic spinning method so that a nano-fiber complex has good biocompatibility of the silk fibroin and excellent bioactivity of the calcium silicate, is more applicable to the biomedical field, and is expected to become an ideal fiber material for a bone tissue engineering support; and the composite nano-fiber support prepared by the method has higher porosity, good mechanical properties, good air permeability and moisture-penetrability, great liquid absorption quantity and simple preparation method and process, and can be degraded in vivio and promote bone injury tissue repair.