246results about How to "Low alkali content" patented technology

The invention discloses an early-strength antifreezing polycarboxylate high-performance water reducing agent and a method for preparing the same. The early-strength antifreezing water reducing agent is prepared from a polycarboxylate water reducing agent, an early-strength antifreezing agent, an air entraining agent and water. The method comprises the following steps: A, the synthesis of the polycarboxylate high-performance water reducing agent: (1) esterification reaction; adding methacrylic acid, and the like to a reaction kettle, and (2) polymerization reaction; heating big monomer methoxy polyethyleneglycol methacrylic ester; B, the preparation for the solution of an early-strength antifreezing agent: a, weighing water and adding the same to the reaction kettle, and adding calcium formate to the reaction kettle, and b, adding triethanolamine, and the like to the reaction kettle to prepare the early-strength antifreezing agent solution; C, the preparation of the air entraining agent: weighing water and adding the same to the reaction kettle, and adding powdered three-level colophony to the reaction kettle to obtain the air entraining agent; and D, the preparation of the finished product: weighing the polycarboxylate water reducing agent and adding the same to the reaction kettle, and adding the air entraining agent and the early-strength antifreezing agent solution to the reaction kettle. The early-strength antifreezing polycarboxylate high-performance water reducing agent has higher water reducing rate and remarkable enhancing effect, and is suitable to prepare various common concrete and high-performance concrete at a negative temperature range of between 20 DEG C below zero and 0 DEG C.

The invention discloses a polymeric aluminum sulfate synthesis method and discloses a preparation method of a novel alkali-free liquid accelerator based on synthesis of polymeric aluminum sulfate. According to the alkali-free accelerator, an aluminum sulfate solution is neutralized by ammonia water, active aluminum hydroxide gel is prepared, active aluminum hydroxide is filtered, dried and ground into powder, then the aluminum sulfate solution is added, and the polymeric aluminum sulfate is prepared. The alkali-free accelerator comprises, in percentage, 45%-55% of the polymeric aluminum sulfate, 0%-5% of inorganic acid, 0%-2% of a stabilizer, 0%-2% of an organic early strength agent, 0%-2% of an organic tackifier and the balance of water. The cement setting time and the colloidal mortar strength of the accelerator can meet the requirement of first-class accelerators for JC477-2005 sprayed concrete under the condition of the lower mixing amount, and meanwhile, the accelerator is an alkali-free liquid accelerator and can effectively avoid adverse effects caused by excessively high alkali content. The cement types of the accelerator have good adaptability.

In all of an in-plane magnetic recording system and a perpendicular magnetic recording system, there is provided a crystallized glass for a disk substrate for information recording medium, etc., which has satisfactory surface properties capable of sufficiently adapting with a lamp loading system for high-density recording, has high strength such that it is able to withstand high-speed rotation and impact, has heat expansion properties and heat resistance in agreement with respective drive members, has a low melting temperature, has excellent productivity and is reduced in the elution amount of an alkali from the raw material, namely excellent in chemical durability. The crystallized glass of the invention is a crystallized glass containing an SiO₂ component and an Li₂O component; further containing at least one member selected from an SrO component and a BaO component in a total content of more than 3.5% and not more than 15% in terms of % by mass; and containing at least one member selected among lithium disilicate, lithium monosilicate, α-quartz, an α-quartz solid solution and a β-quartz solid solution as a main crystal phase on the oxide basis.

To provide a glass fiber which can improve the refractive index of the glass fiber to the same level as a polycarbonate and maintain the transmittance of a molded product after the fiber is reinforced, and a glass fiber-reinforced polycarbonate resin molded product using the glass fiber.

A glass fiber to be used as a glass fiber for reinforcing a polycarbonate resin comprising, as inorganic components in whole glass fiber, from 50 to 60 mass % of SiO₂, from 10 to 15 mass % of Al₂O₃, from 15 to 25 mass % of CaO, from 2 to 10 mass % of TiO₂, from 2 to 8 mass % of B₂O₃, from 0 to 5 mass % of MgO, from 0 to 5 mass % of ZnO, from 0 to 5 mass % of BaO, from 0 to 5 mass % of ZrO₂, from 0 to 2 mass % of Li₂O, from 0 to 2 mass % of Na₂O and from 0 to 2 mass % of K₂0, wherein the total content of the above Li₂O, Na₂O and K₂O is from 0 to 2 mass % based on the above whole glass fiber, and the refractive index of the above glass fiber is from 1.580 to 1.590.

The invention relates to an early-strength polycarboxylic acid water reducing agent and a preparation method thereof. The early-strength polycarboxylic acid water reducing agent is in a liquid state, and the solid content is 40%. The preparation method comprises the following steps: polymerizing modified polyoxyethylene ether or polyoxypropylene ether, (methyl)acrylic acid or itaconic acid, acrylamide, sodium methyl propenyl sulfonate and other monomers under the actions of a molecular weight chain initiator and a chain transfer agent; and neutralizing to obtain the water reducing agent containing carboxy, amino, sulfonic and polyethenoxy side chains. The early-strength polycarboxylic acid water reducing agent provided by the invention has the advantages of low alkali content and high water reducing rate; and when the early-strength polycarboxylic acid water reducing agent, which accounts for 0.6-1.4 wt of the cementing material, is added to the cementing material, the concrete is labor-saving for operation, and the cement mixture has high flowability and good workability. The early-strength polycarboxylic acid water reducing agent can effectively shorten the setting time and enhance the early strength. The invention has the advantages of simple production technique, easily controlled reaction conditions and no environmental pollution.

The invention discloses a low-alkalinity tile glue, which comprises the following components in parts by weight: 30 to 45 parts of cement, 40 to 60 parts of fine aggregate, 8 to 15 parts of filling material, 0.2 to 0.5 part of water-retaining and thickening agent, 0 to 0.1 part of starch ether, 1 to 3 parts of redispersable latex powder, 0.1 to 0.3 part of water reducer, 0.1 to 0.3 part of retarder, 0.1 to 0.4 part of salt-petering resisting agent, 0.1 to 1.0 part of fiber, and 15 to 22 parts of water. The tile glue has the advantages of low alkalinity, salt-petering resistance, good construction performance, high adhesive strength, cavity and cracking resistance, and slippage resistance.

The invention discloses a multifunctional composite carpet comprising three-dimensional warp knitting fabric composed of a top layer, a bottom layer and a connecting layer connecting the top layer and the bottom layer. The top layer, the bottom layer and the connecting layer enclose to form a cavity. The multifunctional composite carpet is characterized in that composite which can be solidified is filled in the cavity, the top layer is made of mesh fiber fabric, the bore diameter of each mesh of the mesh fiber fabric ranges from 0.02mm to 60mm, and the meshes in the top layer are in regular or irregular shapes. The multifunctional composite carpet and the ditch construction technology thereof have the advantages of good overall performance, environment friendliness, flexibility in application, convenience in using, mounting, demounting and transporting; the solidified composite can form special materials of mesh composite concrete layer with serialized functions and having certain thickness and hardness; the ditch construction technology is simple in technology, convenient to construct, high in efficiency, good in overall performance and attractive in appearance.

A method using an alkaline process to extract alumina in coal ash relates to a method using coal ash to produce alumina and is characterized by comprising the steps of (1) manufacturing coal ash, limestone or lime into raw slurry with alkali liquid; (2) firing the raw slurry into clinker; (3) performing alkaline leaching on the clinker; (4) desiliconizing leaching liquid to perform liquid-solid separation; (5) carbonating and resolving desiliconized liquid after liquid-solid separation to obtain aluminium hydroxide; (6) roasting the aluminium hydroxide to achieve alumina; (7) performing alkaline leaching on solid phase residues obtained from the step (3); (8) using leaching liquid obtained from the step (7) to adjust molecular ratio of a system in desiliconization treatment; or adding lime in the leaching liquid obtained from the step (7), filtering after reaction, and obtaining filter residues which are used for desiliconization of the step (4). The method can be used for treating coal ash raw materials from different sources to produce alumina.

The invention provides a dissolving method with Bayer process, relating to a preparation method used in the dissolving process, in which diasporic bauxite is used as a raw material and aluminum oxide is produced with Bayer process. The invention is characterized in that: in the dissolving process, sodium ferrate, lime and the lye is added into bauxite, the amount of sodium ferrate and lime is calculated according to silicon content in bauxite which can be completely changed into molten iron garnet(3CaO.Fe2O3.nSiO2.(6-2n)H2O); the lye concentration NK is 100g/L to 450g/L, aluminium oxide concentration is less than 5g/L, the solid content of the dissolved preparation ore pulp is 50g/L to 300g/L, the temperature is 80 DEG C to 180 DEG C the dissolving time is 0.5 hour to 12 hours., and then the solid and the liquid are separated, the solid is dissolved in the condition of the conventional Bayer process. Through the invention, the existing form of silicate mineral of the dissolved red mud is mainly molten iron garnet instead of the usual sodium-silicon residue. The invention reduces the alumina-silicon ratio A/S and the sodium-silicon ratio N/S of the dissolved red mud. The invention is adapted to process diasporic bauxite source of Chinese high alumina-silicon.

The invention relates to a polyether early- strength super-plasticizing agent. The preparation method comprises following steps: (1) copolymerization of water- borne free radical: 5%- 15% monomer a, 82%- 92% monomer b, 2%- 8% monomer c, and 1%- 3% monomer d copolymerizes in water- borne medium, the total amount of said monomers is 100%; (2) neutralizing reaction: adding alkoxy organic amine e showed in general formula (6) and (7) into copolymer after polymerizing reaction for neutralization, moderating the copolymer pH to be between 6.0- 7.5. The invention is characterized in that: (1) the dispersing performance and strengthening effect are outstanding at very low amount, and the strengthening effect at normal temperature or lower temperature at early stage is excellent, and the effect at middle and later stage grows stably; (2) it can reduce the concrete contract, and the contract rate is less than 90% of that of standard concrete; (3) it barely contains no chloride ion and is helpful for concrete durability increase.

The invention relates to a cellulose carbamate dissolved combined solvent. The solvent is an aqueous solution comprising 6 to 10 weight percent of sodium hydroxide and 0.1 to 3 weight percent of zinc oxide. A dissolving method comprises the following steps of: dispersing a certain amount of cellulose carbamate in a solvent composite, freezing at the temperature of between -20 and -10 DEG C for 3 to 5 hours or freezing in liquid nitrogen for 3 to 5 minutes, unfreezing at the temperature of less than or equal to 50 DEG C, and dissolving to obtain the cellulose carbamate solution at high concentration of 4 to 15 weigh percent. The obtained cellulose carbamate solution is low in sodium hydroxide content, high in solution stability, and has high mobility after standing at normal temperature for several days, and a gel phenomenon is avoided. The cellulose carbamate solution can be used for preparing fibers and films.

The invention relates to a production method of modified red mud complexed polyvinyl chloride colorized rigid plastic. The method is characterized in that: graded red mud with a specification of -800 meshes is modified by using a titanate coupling agent; 35-45 parts of the modified red mud, 100 parts of polyvinyl chloride, 5-10 parts of an impact modifier, 3-5 parts of a stabilizing agent, and 0.2-0.8 parts of a lubricating agent are subject to high-speed mixing, melt extrusion and filming, such that the colorized rigid plastic is obtained. According to the invention, red mud is subject to a modification treatment, such that the compatibility of the red mud and polyvinyl chloride is substantially improved. When the plastic is subject to the filming treatment, a monotonic brownish red color of the red mud complexed polyvinyl chloride substrate plastic is changed, a woody pattern is provided, the color is diversified, and the plastic is provided with a good appearance.

The invention relates to a method for preparing an air entrainment-controllable polycarboxylate water-reducing agent. The method comprises the following steps: an aqueous solution of polyethylene glycol methyl ether methacrylate and methylacrylic acid is added dropwise into 75-80 DEG C water and an aqueous initiator solution is added dropwise in water at the same time, the temperature is maintained at 75-80 DEG C and the addition of reactants is completed within 6-7 hours, the temperature is maintained at 78-80 DEG C for 2-3 hours, the reaction product is naturally cooled down to room temperature and neutralized with a diluted alkali solution until the pH value is in the range from 6.5 to 7.5, and the air entrainment-controllable polycarboxylate water-reducing agent is obtained. The method has the advantages of simple synthetic processing equipment, controllable reaction conditions, no pollution, low cost and suitability for industrialized production. Under the condition of low mixing amount, the synthesized air entrainment-controllable polycarboxylate water-reducing agent exhibits high water-reducing rate, good fluidity and fluidity retention, and controllability in air content; and can efficiently increase concrete workability, prevent the bleeding and segregation of concrete and improve the frost resistance and water impermeability of hydraulic concrete.

The invention discloses a slow hardening pump deliver type three expansion source concrete expansion agent, which is characterized by comprising preparation of raw materials such as anhydrite, high alumina chamotte, high-calcium sulphoaluminate chamotte, calcined magnesite and so on by weight portion and externally doped slushing agent, water retention agent, air entraining agent and retardant. The preparation method of the expansion agent comprises steps of crushing, common mixture, mixing and grinding and external doping mixture and finish product forming. The product has low alkali content, excellent expansion performance, strong suitability with concrete, balanced mechanical property after hardening, and small gradual slump loss of concrete shrinkage compensation, contributes to improving safety and durability of reinforced concrete, obviously improves the cracking resistance, volume stability, impermeability and frost resistance, and is simple and convenient to use and easy to control quality in construction. The slow hardening pump deliver type three expansion source concrete expansion agent can meet construction use requirements of commercial concrete, long distance pump-delivering concrete and mass concrete.