41results about How to "Prolonged initial setting" patented technology

An implantable therapy system including implantable stimulation and control components. The implantable components operate under a set of variable parameters that can be adjusted for improved performance for an individual patient. The implantable components are adapted to self-evaluate the patients physiologic performance and autonomously adjust an existing set of parameters to improve performance throughout an implantation period without requiring intervention of a clinician, for example with a physicians programmer. The implantable components can compare a patient's exhibited activity to a desired template of that activity to determine when adjustments are indicated. The template can be based on observations of one or more third parties exhibiting normal activity. The implantable components can adjust the operating parameters to improve synchrony of multiple heart chambers and/or to increase a peak contractility.

The invention discloses a 32.5 modified mixed Portland cement and a preparation method thereof. The cement comprises, by mass, 45.0-68.0% of Portland cement clinker and gypsum, 5.0-25.0% of limestone,0-0.5% of a grinding aid and 0.02-5.5% of a modifying component, and also includes 5.0-45.0% of one or more of granulated blast furnace slag, granulated blast furnace slag powder, a vulcanic ash mixture and a fly ash-containing active or non-active mixture, and 8.0% or below of other incorporation-allowed waste slag. The raw materials have wide sources, and the preparation method is not complicated, relates to the fields of comprehensive utilization of cement, concrete, mortar and solid wastes, and meets the conditions of the process for preparing the cement product containing the modifyingcomponent. The cement improves the homogeneity, the workability, the durability and other performances of concrete and mortar prepared from the cement, increases the construction efficiency, and facilitates of comprehensive utilization of resources, energy saving and emission reduction.

The invention discloses retarder applicable to sulphate aluminum cement. The retarder is composed of, by weight, 7-60 parts of carbamide, 3-11 parts of sodium lignin sulfonate, 2-7 parts of dinaphthyl methane disulfonic acid sodium, 2-5 parts of water reducing agent and 30-70 parts of vermiculite. By means of the retarder, the coagulation speed of the sulphate aluminum cement can be effectively reduced, the flowability of sulphate aluminum cement slurry can be remarkably improved, and the water demand in the sulphate aluminum cement mixing process can be reduced. The carbamide is added into the retarder, the coagulation time of the sulphate aluminum cement can be prolonged, nitrogen nutrient elements required by the plant growth can be further released slowly after the cement slurry is hardened, and the nitrogen nutrient elements are supplied to plants in porous plant-growing concrete for meeting the plant growth requirements.

The invention relates to a compound admixture for bare concrete and the bare concrete, belonging to the technical field of concrete materials. The compound admixture for the bare concrete is preparedfrom a polycarboxylate copolymer, an anionic surfactant, a nonionic surfactant, an activator, a buffer solution, sodium gluconate, polyoxyethylene polyoxypropylene ether, tetramethylurea, polyethyleneglycol and water. The bare concrete is prepared by mixing the compound admixture for the bare concrete, cement, fly ash, sand, stones and water. After being mixed with the concrete, the compound admixture for the bare concrete can improve the fluidity without increasing the bleeding rate of the concrete, and prolongs the time interval between initial setting and final setting, thus enabling the concrete to have the advantages of being low in bleeding rate, high in fluidity and long in time interval between initial setting and final setting.

The invention discloses super-sulfate cement and a preparation method thereof, in particular to phosphorus slag super-sulfate cement and a preparation method thereof. The phosphorus slag super-sulfate cement comprises the following components by weight portions: 30-50 portions of electric furnace phosphorus slag, 25-50 portions of slag, 10-20 portions of plaster, 1-10 portions of auxiliary materials and 1-10 portions of alkaline composition, wherein the auxiliary materials are admixtures of active CaO, active Al2O3 and active SiO2, and the alkaline composition is at least one of cement clinker and calcium hydroxide. The preparation cost of the super-sulfate cement can be effectively reduced, and the phosphorus slag super-sulfate cement fully utilizes the phosphorus slag resource with rich sources. Meanwhile, the setting and hardening speed of the phosphorus slag super-sulfate cement is high, and the initial setting and final setting time and the mechanical property conform to the requirement of GB175-2007 on P.O42.5 ordinary portland cement.

A special cement for masonry mortar comprises the following raw materials in proportion: clinker, gypsum, limestone, grinding aid and modifying component, and also comprises one or more of active or inactive mixtures including granulated blast furnace slag, granulated blast furnace slag powder, pozzolanic mixture and fly ash and other waste slag is allowed to replace the active mixture. The invention also discloses a preparation method of a special cement for masonry mortar, and a secondary batching mixing and homogenizing system is adopted in the design. The method has a wide source of raw materials and relates to the field of cement mortar. The homogeneity of cementitious material system in mortar is improved and the properties and construction efficiency of mortar are improved without adding admixtures and additives when the special cement for masonry mortar is used to prepare masonry mortar.

The invention discloses a retarder for sulphate aluminum cement and a use method thereof. The retarder is prepared from the following raw materials in parts by weight: 30-70 parts of polymer emulsion, 10-25 parts of metylchloro isothiazolinone, 2-10 parts of film-forming agent, 1-15 parts of water reducer and 5-15 parts of polyethylene glycol. The invention also discloses the use method for the retarder. The retarder disclosed by the invention can effectively reduce the coagulation speed of the sulphate aluminum cement; the initial setting time and the final setting time both can be prolonged for above 30min; the fluidity of the cement slurry can be obviously promoted; the fluidity of cement paste can be increased by above 15%. The retarder disclosed by the invention has no any adverse effect to the development of the cement strength, is low in cost, is high in performance stability and is easily stored and transported.

The invention discloses a preparation method of a delayed coagulation type ether polycarboxylate water reducing agent. The preparation method comprises the following steps: (1) preparing an esterification monomer; (2) performing a copolymerization reaction; and (3) performing a neutralization reaction. The preparation method uses a saccharide compound and crotonic acid to prepare the esterification monomer, and has the advantages of low costs and simple and convenient operation; the prepared saccharide esterification product participates in the next step of the copolymerization reaction, so that the main chain of the polycarboxylate water reducing agent has a polyhydroxy structure, the prepared polycarboxylate water reducing agent has a better delayed coagulation effect, the initial setting and final setting time of cement is effectively prolonged, and negative effects caused by using a retarder can be reduced; and the polyhydroxy structure of the saccharide compound enables the polycarboxylate water reducing agent to have better slump loss resistance, so that the pumping construction of concrete in summer is facilitated.

The invention discloses a manufacturing process of a high-efficiency retarder, which comprises the following steps: 1) weighing an organosilicon modified acrylic emulsion, a film-forming agent, a water reducing agent and polyethylene glycol in parts by weight, and mixing them uniformly; 2) placing them in water Add amantadine ethylamine, phosphorous acid, sodium glucoheptonate, stir and heat to 60-80 ℃, and add formaldehyde solution dropwise; 3) after dissolving white sugar, add citric acid, tartaric acid, borax, maltodextrin, stir and mix. 4) Mix the slurry prepared in steps 1), 2), and 3) together, stir, and mix to obtain a retarder. The retarder of the invention has good retardation effect, stable chemical properties when applied to cement slurry, easy adjustment of thickening time, can avoid premature coagulation of cement, reduce the loss rate of cement strength, and has good Regularity and operability, low cost and simple operation.

The invention relates to the field of concrete auxiliary agents, in particular to a special anti-sloughing liquid coagulant for foam concrete cast-in-place wall. The special anti-sloughing liquid coagulant is prepared from the following components in parts by weight: 30-55 parts of polyaluminum sulfate, 5-10 parts of magnesium sulfate, 0.1-5 parts of tertiary amine, 1-5 parts of magnesium fluosilicate, 0.1-0.5 part of an amide modified polycarboxylate superplasticizer, 1-4 parts of mixed acid, 0.1-0.5 part of sodium bicarbonate, 0.1-0.5 part of hydroxypropyl methyl cellulose, 0.1-0.5 part of carboxymethyl starch ether, 1-3 parts of sodium tripolyphosphate and 400-500 parts of water. The early setting agent can shorten the initial setting time and the final setting time of the foam concrete, prevents a foam concrete wall from collapsing, avoids the bleeding phenomenon, and improves the mechanical property of the foam concrete to a certain extent.

The invention relates to the technical field of building materials, in particular to a setting time regulator, a preparation method thereof and a ceramic tile glue. The setting time regulator is a core-shell type material and comprises an inner core and a shell layer coating the inner core, wherein the shell layer is made of a composite material of a water-soluble organic gel material and a retarder; and the inner core is made of a setting accelerator, wherein the melting point of the setting accelerator is Taccelerator, the melting point of the retarder is Tslow, and the melting point of thewater-soluble organic gel material is Tgel, the Taccelerator being greater than the Tslow, and the Taccelerator being greater than the Tgel. The setting time regulator solves the problem that the material property is not matched with the robot construction process in the construction process of paving ceramic tiles by the building robot at present, and is suitable for the robot construction rhythm.

The invention belongs to the field of cement, and particularly relates to a retarding clinker and a preparation method thereof. The retarding clinker comprises the following raw materials in percentage by mass: 81.0-93.0% of limestone, 3.0-15% of clay, 1.0-5.0% of non-ferrous metal ash residues, and 1.5-3.5% of fluorite tailings, wherein the content of calcium fluoride in the fluorite tailings is15-30%. By adding a certain amount of fluorite tailings, the initial setting time and the final setting time of the clinker are prolonged, and the production of the delayed coagulation clinker is realized, so the requirements of special engineering on the performance of retarding cement can be met; in addition, the mechanical property of the clinker is still maintained, so concrete quality can beensured while the requirements on cement retarding characteristics are met; and meanwhile, the fluorite tailings are effectively utilized, the utilization way of the fluorite tailings is broadened, stacking and external emission of waste production enterprises are reduced, and the demands of environmental protection are met.

The invention relates to cement slurry for concrete repair. The cement slurry for concrete repair comprises the following components in parts by mass: 30-60 parts of cement, 20-50 parts of a carboxyl material, 12-16 parts of coal ash, 5-10 parts of a butylbenzene emulsion, 0.5-5.5 parts of an early strength agent and 0.2-0.8 parts of a defoamer. The cement slurry for concrete repair provided by the invention has the advantages that according to the cement slurry for concrete repair provided by the invention, the carboxyl material is added into the formula, so that initial set of cement slurry can be accelerated, the water reducing rate of mortar can be improved, and the volume-weight of newly mixed mortar is reduced; the ratio of bending strength to compressive strength and the adhesive strength of the mortar are obviously improved, so that the quickly repaired concrete is better in durability.

The invention provides an alkali-free liquid accelerator. A preparation method for the alkali-free liquid accelerator comprises the following steps: dissolving 1-5 parts of iminodisuccinic acid or salt thereof in 100 parts of water, adding 15-30 parts of aluminum sulfate and 5-15 parts of pseudo-boehmite, conducting stirring for at least 30 minutes, adding 0.5-1 part of triisopropanolamine and 1-3 parts of a dispersion stabilizer after stirring, performing continuous stirring, dropwise adding 1-2 parts of latex, and after dropwise addition, adjusting the pH value of the whole system to 6-8. The alkali-free liquid accelerator is simple in preparation method, high in initial setting speed and final setting speed and high in later strength.