58results about How to "Improve pulp fluidity" patented technology

The invention discloses an efficient polycarboxylic acid water reducing agent with modified celluloses. The efficient polycarboxylic acid water reducing agent comprises, by weight, 240-250 parts of methyl-2-buten polyoxyethylene ether, 25.2-26.0 parts of acrylic acid, 1.6-1.65 parts of ammonium persulfate, 0.53-0.55 part of thioglycolic acid, 13-14 parts of lignin, an appropriate quantity of sodium hydroxide solution with the concentration of 10 wt%, an appropriate quantity of deionized water, 26-28 parts of graphene oxide, 5-7 parts of waste liquid from sugar factories, 7-8 parts of hydroxypropyl methyl celluloses, 2-3 parts of polyacrylamide, 3-4 parts of calcium chloride, 2-3 parts of triethanolamine, 5-6 parts of carbon black, 19-22 parts of building brick residues and 1-1.2 parts of silane coupling agents kh550. The efficient polycarboxylic acid water reducing agent has the advantages that components such as the hydroxypropyl methyl celluloses, the polyacrylamide and the carbon black are added into the efficient polycarboxylic acid water reducing agent in preparation procedures by the aid of a series of treatment processes, accordingly, the flowability and the frost resistance of concrete can be improved, and the dispersion resistance of products in water further can be improved.

The invention relates to a preparation method for modified cyclodextrin water reducer. Beta-CD (cyclodextrin) originated from natural starch is utilized as raw materials, carboxylic groups are introduced onto beta-CD molecules modified by chloroacetic acid, and the beta-CD has fine dispersity, fluidity and slow setting by the aid of a cavity structure of the beta-CD and hydroxy and carboxylic radicals on the surface of the beta-CD, so that the beta-CD can be independently utilized and also utilized with polycarboxylate water reducer. The beta-CD independently utilized as the water reducer is stable in performance, high in adaptability to cement and good in compatibility with other additives, the cement paste fluidity can reach more than 240mm [W/C (water/cement)=0.35], the concrete water reducing rate can be up to 18-25%, and the slump retention time ranges from 5 hours to 7 hours. When the beta-CD is utilized with the polycarboxylate water reducer, the cement paste fluidity of the polycarboxylate water reducer can be increased by about 30mm, the slow setting and slump retention time can be prolonged by 3-5 hours, overflow, separation and the like of the polycarboxylate water reducer can be effectively prevented, and adaptability of the polycarboxylate water reducer to aggregate containing mud is enhanced.

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 a preparation method of a fluorine-containing shrink-reduced polycarboxylate water reducing agent. The method particularly includes: 1) preparation of a polycarboxylate water reducing agent prepolymer: under effects of an initiator, a reducing agent and a chain transfer agent, performing a redox radical polymerization reaction to a carbonyl-containing monomer, an unsaturated acid monomer and an unsaturated macro-monomer to obtain a carbonyl-containing polycarboxylate water reducing agent prepolymer; 2) preparation of the fluorine-containing shrink-reduced polycarboxylate water reducing agent: performing a nucleophilic substitution reaction to the carbonyl-containing polycarboxylate water reducing agent prepolymer with a Prakash reagent (TMSCF3) to obtain the water reducing agent. The water reducing agent can significantly reduce surface tension and improve cement dispersibility, is high in shrinkage reducing performance on the basis of high water reduction, is good in compatibility with cement, is low in gas content when being applied to concrete, can effectively improve size stability of concrete and reduce shrinkage cracking and can improve the durabilityand service life of a concrete structure.

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 lignin-graphene oxide composite modified polycarboxylic acid efficient water reducing agent. The water reducing agent is prepared by, by weight, 240-250 parts of TPEG, 25.2-26.0 parts of acrylic acid, 1.6-1.65 parts of ammonium persulfate, 0.53-0.55 part of thioglycolic acid, 13-14 parts of lignin, an appropriate amount of sodium hydroxide solution with the concentration being 10wt%, an appropriate amount of deionized water, 26-28 parts of graphene oxide, 20-23 parts of boiler slag, 5-7 parts of sorbitol, 2-3 parts of sodium nitrite, 2-3 parts of dodecyl dimethyl benzyl ammonium chloride, 4-5 parts of carbon black and 3-4 parts of microcrystalline wax. The lignin-graphene oxide composite modified polycarboxylic acid efficient water reducing agent has the advantages that components such as the carbon black and the dodecyl dimethyl benzyl ammonium chloride are added into the preparation of the water reducing agent, so that the dispersity of the water reducing agent in concrete can be increased; the industrial waste boiler slag is added into the water reducing agent, so that production cost is lowered; the sodium nitrite is added into the water reducing agent, and accordingly the early strength and later strength of the concrete are further increased.

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 relates to a high-flowing micro-expansion anti-dilution grouting agent used for cement concrete pavement slab suspending, which consists of 0-85% of fine sand, 14-85% of fly ash, 0.5-1.5% of water reducing agent, 0-1% of early strength agent, 0-25% of expansion agent and 0-5% of air-entraining agent. In the cement concrete pavement slab suspending, cement and water also need to be added in the high-flowing micro-expansion anti-dilution grouting agent, and evenly stirred for use, so that the grouting agent does not have bleeding lamination or shrinking, can compensate the shrinking of slurry or has certain expansion property, and serum is even, not easy to be diluted by moisture below a slab, and good in quality, and has the function of preventing water immersion, so as to enable 24-hour strength of a grouting material to reach above 3.5 MPa which is matched with the compressive strength of a base layer to be grouted, ensure a concrete face to obtain uniform support of a bottom plate again, and prolong the service life of the concrete face.

The invention discloses a grinding aid for improving the adaptability of a high-alumina clinker cement admixture, and solves the technical problems that a grinding aid in the prior art causes lowadaptability of high-alumina clinker cement to the admixture and reduces the early strength of the high-alumina clinker cement. The grinding aid comprises: 3%-20% of dimer glycerol; 10%-27% of monoethanol diisopropanolamine; 2%-7% of hydroxyethylidene diphosphonic acid; 0.1%-0.25% of polyacrylamide; and the balance of water. Compared with a traditional grinding aid, the grinding aid for improving the adaptability of the high-aluminum clinker cement admixture has higher admixture adaptability, the fluidity of neat paste is improved by 20 mm or above, the slump of C30 and C25 concrete is improved by 15 mm or above, and the expansion degree is improved by 15 mm or above; and the formula of the grinding aid is optimized to improve the 28-day strength of the high-alumina clinker cement concrete.

The invention discloses a concrete water-reducing agent and the application of the concrete water-reducing agent. The concrete water-reducing agent comprises the components by weight ratio: 58-80 parts of polycarboxylate high-performance water-reducing agent and 20-42 parts of compound containing hydroxyl and carboxyl. According to the concrete water-reducing agent, the advantages of the polycarboxylate high-performance water-reducing agent can be developed and the adaptability of the polycarboxylate high-performance water-reducing agent can be improved, in addition, the dosage is reduced, resources are saved, energy consumption is reduced and the comprehensive application cost of the polycarboxylate high-performance water-reducing agent can be lowered.

The invention discloses a water reducing agent for shrinkage-compensating concrete. The water reducing agent comprises the following components in percentage by weight: 70%-80% of naphthalene or homologue, 5%-7% of aliphatic compound, 1%-6% of sodium gluconate, 1%-3% of lauryl sodium sulfate, 0.1%-0.5% of cellulose formaldehyde, 0.1%-0.5% of hydroxypropyl methyl cellulose and the balance of water. The water reducing agent disclosed by the invention has no waste and dust, has no damage to a human body, has no pollution to the environment, and belongs to a green product in the construction industry; simultaneously, the early cracking can be reduced, and harmful cracks of the concrete can be reduced into harmless cracks.

The invention relates to a method for preparing a delayed coagulation type super plasticizer through atom transfer radical polymerization. The method comprises the steps of with a delayed coagulationtype monomer and a carboxylic acid small monomer as main reaction raw materials, sequentially carrying out atom transfer radical polymerization (ATRP), alcoholysis and copolymerization so as to prepare the delayed coagulation type super plasticizer, namely that carrying out atom transfer radical polymerization (ATRP) on the delayed coagulation type monomer as a reactant under the system formed byan unsaturated initiator, transition metal halide and a ligand so as to obtain an unsaturated macromonomer, carrying out alcoholysis so as to obtain a delayed coagulation type macromonomer, and copolymerizing with the carboxylic acid small monomer, so as to obtain the delayed coagulation type super plasticizer. According to the method, a functional side chain consisting of delayed coagulation typestructural monomers is innovatively designed and synthesized by virtue of a controllable polymerization technical measure, a traditional polymer side chain structure is replaced, the super plasticizer presents excellent capacities of dispersing element purified slurry, and the coagulation time of the element purified slurry can be remarkably delayed, so that the later-period strength of concreteis improved, and multiple effects of high water reduction, slump resistance and delayed coagulation are achieved.

The invention relates to a preparation method of a modified silica fume material, which belongs to the technical field of building materials, and comprises the following steps: adding silica fume into absolute ethyl alcohol, and uniformly dispersing to obtain silica fume dispersion liquid; and adding a silane coupling agent into deionized water, adding the prepared silane coupling agent hydrolysate into the silica fume dispersion liquid, placing in a water bath at 60-80 DEG C, magnetically stirring, filtering after completion, cleaning filter residues with deionized water, and finally performing vacuum drying and grinding to obtain the modified silica fume material. The silane coupling agent is adopted to modify the silica fume, amino silane reacts with silicon hydroxyl on the silica fume, the Zeta potential on the surface of the silica fume changes, negative charges are changed into positive charges, the steric hindrance among silica fume particles is increased, the number of large particles of the modified silica fume is reduced, and particle size distribution is more concentrated; and after the modified silica fume is doped into the fly ash cement, the fluidity of fly ash cement neat paste is improved, the dispersity of the modified silica fume is improved, and the early strength of the fly ash cement is improved.

The invention discloses a rear earth tailing added polycarboxylate superplasticizer. The polycarboxylate superplasticizer is prepared from, by weight, 240-250 parts of TPEG, 25.2-26.0 parts of acrylic acid, 1.6-1.65 parts of ammonium persulfate, 0.53-0.55 part of mercaptoacetic acid, 13-14 parts of lignin, appropriate amount of sodium hydroxide solution with concentration being 10wt%, appropriate amount of deionized water, 26-28 parts of graphene oxide, 2-3 parts of sodium dodecyl benzene sulfonate, 11-13 parts of rare earth tailings, 0.6-0.7 part of sodium hexametaphosphate, 0.3-0.4 part of sodium tripolyphosphate, 2-3 parts of cerous nitrate and 4-5 parts of EVA (ethylene-vinyl acetate) latex. The superplasticizer is capable of effectively improving grain boundary energy of cement products to improve compactness of an internal structure of concrete, and accordingly concrete strength is improved, durability is further improved, and defects caused by low strength in industrial production can be reduced.

The invention relates to an adsorbent and a preparation method and application thereof and belongs to the technical field of organic polymer compounds. The adsorbent is a mixture and is made mainly from a polymer chelating agent, modified chitosan, polyacrylamide, sodium metaaluminate and the like. The adsorbent synthesized in the application is used in the field of synthesis of water-reducing agents and can decrease the total content of Ca2+ and Mg2+ in water to 0.3 mg/L and below and the total content of Zn2+ and Fe2+ to 0.05 mg/L and below.

The invention provides a method for improving the fluidity and concentration of ore pulp. The method comprises the following steps that a micron-sized component A is added into the ore pulp, and/or high-frequency vibration is performed, wherein the particle size dA of the component A is 20 microns or below. According to the method for improving the fluidity and the concentration of the ore pulp, the mineral substance component A with the quite high lubricity is added into the ore pulp of existing ore pulp preparation equipment so as to improve the fluidity of the ore pulp; meanwhile, high-frequency vibration is performed on the prepared ore pulp so as to increase the stacking density and then improve the concentration.

The invention relates to lignosulfonate prepared from ground wood pulp waste liquor and a preparation process thereof. The lignosulfonate has molecular weight of 15,000 to 80,000 and is a brownish black or brown liquid product; the pH (potential of hydrogen) value of the lignosulfonate is in the range of 7 to 9; or the product is subjected to spray drying to obtain yellowish-brown or nigger-brownpowder solid; and the preparation process of the lignosulfonate comprises the following step that the concentrate ground wood pulp waste liquor is subjected to etherification, sulfonation reaction and condensation reaction sequentially to obtain the lignosulfonate. The product is widely used for a concrete admixture, a dye dispersant, a coal water slurry additive and other industries. All the performances of the product can meet the requirements of related quality standards. The lignosulfonate product has high dispersion liquidity. The preparation process is simple. The condition is mild. Conventional equipment is adopted. The production cost is low. The aim of changing waste materials into things of value is fulfilled. No three wastes are discharged in the production process. The lignosulfonate has popularization and application value.

The invention discloses modified mixed silicate cement and a preparation method thereof and relates to the field of cement and concrete production technologies and comprehensive utilization of solid wastes. Besides Portland cement clinker, gypsum, limestone and an activating agent, the composition of the cement also comprises one or more of granulated blast furnace slag, fly ash, a pozzolanic mixed material and the like, and the cement also includes other waste residues and modified components. The modified mixed silicate cement aims to solve the problems that since there are too many limits to existing production process conditions and existing cement temperature is high, it is difficult to add an admixture for concrete in cement production. According to the modified mixed silicate cement, a combined cooling device is adopted, the temperature of the cement can be controlled to be not higher than 60 DEG C, and the structure and effect of the modified components are prevented from beingdamaged; a secondary batching system, a uniformizing system and an automatic control system are added and optimized to satisfy the technical conditions for preparation of different varieties, products with modified components and the like. The modified mixed silicate cement can improve the uniformity, workability, durability, color and other properties of concrete and mortar, simplify construction operation and have a broad application prospect.