24results about How to "Good water reduction effect" patented technology

The invention relates to a flame-retardant inorganic quick-setting material and a preparation method thereof, and the flame-retardant inorganic quick-setting material is prepared from the following raw materials: sulphoaluminate cement, aluminum-magnesium hydrotalcite, phosphorus slag powder, waste PBO fiber, an accelerator, a water reducer, a functional auxiliary agent, and 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone. The functional auxiliary agent comprises structural units introduced by the following monomers: 3-[N, N-dimethyl-[2-(2-methylpropyl-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt, diphenyl (4-vinyl phenyl) phosphine oxide, 1, 3-bis (oxirane methyl)-5-(2-allyl)-1, 3, 5-triazine-2, 4, 6 (1H, 3H, 5H)-triketone, 10-(4-vinyl phenyl)-10H-phenoxazine and itaconic acid. The material is high in strength, remarkable in rapid hardening and flame-retardant effect, and safe and environment-friendly to use.

The invention discloses a viscosity-reducing fast-dispersing polycarboxylate superplasticizer for high-strength concrete and a preparation method thereof, and relates to the technical field of polycarboxylate superplasticizers. The viscosity-reducing fast-dispersing polycarboxylic acid water reducer for the high-strength concrete comprises the following components in parts by weight: 400 parts of unsaturated polyether macromonomer, 20-40 parts of unsaturated acid monomer and 10-20 parts of unsaturated functional monomer. The invention also provides a preparation method of the polycarboxylate superplasticizer. The water reducer can reduce the viscosity of high-strength concrete, improve the dispersing performance of the concrete and shorten the mixing time, so that the problems of high plastic viscosity and the like of the concrete are solved under the condition of not reducing other performances such as the strength of the concrete.

The invention provides a concrete water reducing agent and a preparation method thereof, and belongs to the technical field of water reducing agents. Adding the modified chitin, 1-vinyl-3-butylimidazolium trifluoromethanesulfonate, a silane coupling agent with double bonds, methacrylic acid, trans-butenedioic acid and an initiator into dimethylformamide, heating and stirring for reaction, removing methylbenzene under reduced pressure, and performing alkali washing and alcohol washing to obtain the concrete water reducing agent. The modified chitin is prepared by modifying chitin modified by sodium sulfonate and acrylic acid with tannic acid. Modified chitin, 1-vinyl-3-butylimidazolium trifluoromethanesulfonate, a silane coupling agent with double bonds, methacrylic acid and trans-butenedioic acid are copolymerized to prepare the polycarboxylate superplasticizer, molecules of the polycarboxylate superplasticizer are of a comb-shaped structure, a main chain of the polycarboxylate superplasticizer is provided with a plurality of active groups with high polarity, and a side chain of the polycarboxylate superplasticizer is provided with hydrophilic active groups. The water-reducing agent has the characteristics of low doping amount, high water-reducing rate, high reinforcing effect, high plasticity retaining property and volume stability, and has wide application prospects.

The invention belongs to the technical field of underwater construction materials, and particularly relates to a self-leveling anti-dispersion underwater bottom sealing material and a preparation method thereof. The self-leveling anti-dispersion underwater bottom sealing material disclosed by the invention is prepared from the following components in parts by weight: 530 to 730 parts of sulphoaluminate cement, 77 to 277 parts of ordinary Portland cement, 84 to 126 parts of fly ash, 870 to 950 parts of fine aggregate, 250 to 278 parts of water, 18 to 23 parts of a water reducing agent, 6 to 10 parts of a flocculating agent, 8 to 12 parts of a retarder, 0.9 to 1.4 parts of a de-foaming agent and 0.1 to 0.4 part of an early strength agent. The self-leveling dispersion-resistant underwater bottom sealing material disclosed by the invention has good fluidity and dispersion resistance.

The invention relates to the technical field of cement additives, in particular to a powder composition for cement addition and a preparation process of the powder composition, modified sodium lignin sulfonate serves as an important component of the powder composition, dispersity and stability of sodium lignin sulfonate are effectively improved through sulfomethylation and condensation reaction, and in cement concrete, the powder composition has the advantages that the dispersity and stability of sodium lignin sulfonate are improved; the modified sodium lignin sulfonate can be adsorbed on the surfaces of cement particles to form a protective film, friction force and resistance among the cement particles can be reduced, so that the fluidity of the concrete is improved, meanwhile, a sulfomethylation structure of the modified sodium lignin sulfonate can chemically react with calcium ions in the cement to form stable calcium salt, the stability of the concrete is further enhanced, and the service life of the concrete is prolonged. According to the powder composition for cement addition and the preparation method of the powder composition, the performance of cement concrete can be remarkably improved through well-designed components, and the composition has excellent flowability, anti-permeability, anti-freezing property, water resistance, mildew resistance and rust resistance.

The invention relates to the technical field of concrete, and in particular to concrete containing a polycarboxylate water-reducing agent and a preparation process thereof. In order to improve the performance of concrete, the invention prepares a polycarboxylate water-reducing agent with a carboxyl protection function. The invention introduces a large number of amide groups into the water-reducing agent, so that in the process of preparing concrete, the polycarboxylate water-reducing agent can be gradually hydrolyzed to generate carboxyl groups in an alkaline environment, and then the cement particles in the concrete are subjected to secondary adsorption, thereby prolonging the working time of the water-reducing agent on the cement particles. In addition, the invention further increases the length of the side chains in the water-reducing agent, provides steric hindrance, further prevents the aggregation between cement particles, improves the water-reducing property, thereby avoiding the solidification between cement particles, maintains the fluidity for a long time, and prolongs the construction time of the concrete.

This invention relates to the field of concrete admixtures, specifically to an anti-mud polycarboxylate superplasticizer, its preparation method, and its application. The anti-mud polycarboxylate superplasticizer provided by this invention comprises, by weight, the following raw materials: 100-180 parts of unsaturated polyether monomer, 5-10 parts of unsaturated carboxylic acid monomer, 2-5 parts of air-entraining monomer, 5-10 parts of anti-mud monomer, 10-20 parts of oxidant, 0.4-0.6 parts of reducing agent, 5-7 parts of chain transfer agent, and 150-300 parts of water; the air-entraining monomer and the anti-mud monomer have specific structures. The simultaneous introduction of specific anti-mud monomers and air-entraining monomers into the anti-mud polycarboxylate superplasticizer of this invention not only reduces clay adsorption but also provides better dispersibility and anti-mud effect at lower dosages, increasing the overall workability of concrete and improving concrete performance.

The present invention discloses an anti-cracking water-reducing agent suitable for alkali-activated cement, and its preparation process and application. The raw materials for preparing the anti-cracking water-reducing agent include the following components: 500 parts of refined naphthalene, 200 parts of formaldehyde solution, 80 parts of dihydroxy-terminated dimethyl silicone oil, 100 parts of alkali solution, 15-20 parts of sodium dodecylbenzene sulfonate, 80-100 parts of sulfate solution, and 400 parts of water. The above-mentioned anti-cracking water-reducing agent of the present invention not only effectively solves the problems of instability and performance failure of existing water-reducing agents in high-alkali environments, thereby reducing the water consumption of alkali-activated cement while ensuring its good fluidity, but also can significantly reduce the shrinkage cracking of alkali-activated cement after hardening, and reduce the risk of cracking and damage.

The invention relates to the technical field of oil well operation admixtures, in particular to a compound oil well cement fluid loss agent and a preparation method thereof. The sulfonated styrene copolymer prepared by taking styrene, maleic anhydride and benzoyl peroxide as raw materials and the high-temperature-resistant liquid fluid loss agent prepared by taking itaconic acid, acrylamide and 2-acrylamido-2-methylpropanesulfonic acid as raw materials are blended, so that the effects of improving the comprehensive performance and expanding the application range are achieved; the sulfonated styrene copolymer has excellent dispersion, scale inhibition and water reduction performance, the high-temperature-resistant liquid fluid loss agent has excellent high-temperature resistance and water loss reduction performance, after the sulfonated styrene copolymer and the high-temperature-resistant liquid fluid loss agent are blended, the advantages of the sulfonated styrene copolymer and the high-temperature-resistant liquid fluid loss agent can be integrated, and the composite fluid loss agent with more comprehensive and excellent performance is formed. The fluid loss agent prepared by blending is matched with the temperature-resistant and salt-resistant polymer, so that the respective advantages of the three raw materials can be fully utilized, the waste of the raw materials is reduced, and the saving and efficient utilization of resources are realized.

The invention discloses a preparation method of a polycarboxylate superplasticizer and the polycarboxylate superplasticizer, belongs to the technical field of concrete admixtures, and solves the problems of insufficient applicability and low performance of the existing polycarboxylate superplasticizer. The method comprises the following steps: stirring and dissolving a polyether monomer, sequentially adding a dispersing agent and a pH regulator, and stirring and dissolving to obtain a main solution; the polyether monomer comprises ethylene glycol monovinyl polyoxyethylene ether. Adding the main solution into a reaction kettle, adding the catalytic solution into the main solution, and stirring for a certain time to obtain a base solution; and simultaneously dropwise adding the first reaction solution and the second reaction solution into the base solution. And after the first reaction solution and the second reaction solution are dropwise added, stirring for a certain time, adding aging water, and stirring to obtain the polycarboxylate superplasticizer mother liquor. The water reducing performance and adaptability of the polycarboxylate superplasticizer can be improved, the slump retaining capacity can also be improved, and the gradual loss of slump is reduced. And meanwhile, the energy consumption can be reduced.

The present invention relates to the technical field of concrete early strength agent, and specifically discloses an antifreeze type ultra-high performance concrete early strength agent, wherein the raw materials include by mass: 10-15 parts of polypropylene, 1-2 parts of maleic anhydride grafted polypropylene, 1-4 parts of sodium chloride, 5-10 parts of polyethylene, 1-2 parts of sodium polyacrylate, 1-2 parts of aluminum chloride, 4-10 parts of diethanolamine, 1-6 parts of triisopropanolamine, 1-2 parts of sodium sulfate, 1-2 parts of silica sol, 1-2 parts of methyl orthosilicate, 1-2 parts of calcium formate, 1-2 parts of aluminum sulfate, 10-20 parts of composite water reducer, and 0.1-1 parts of defoamer. The present invention also discloses a preparation method of the above-mentioned antifreeze type ultra-high performance concrete early strength agent. The present invention also discloses the application of the above-mentioned antifreeze type ultra-high performance concrete early strength agent.

The present invention discloses a special admixture for solid waste-based cementitious materials, and belongs to the technical field of concrete water reducing agents. The special admixture for solid waste-based cementitious materials comprises, by weight, 35 to 55 parts of component A of a specific molecular formula, 20 to 30 parts of component B of a specific molecular formula, and 10 to 40 parts of component C of a specific molecular formula. The long chain introduced into component A and component B of the present invention can enhance their dispersibility to powders, which is beneficial to improving the water reducing effect on solid waste-based cementitious materials; the phosphoric acid group contained in component C has a stronger adsorption capacity in several phases than carboxylic acid and sulfonic acid groups, and therefore can be preferentially adsorbed on the surface of tailings micropowder, thereby effectively avoiding the adsorption of tailings micropowder on water reducing agent and reducing the water reducing effect of water reducing agent. In addition, the lone pair of electrons of the N element contained in component C can chelate the CaO formed by the hydration of CaO in the steel slag. 2+ , slowing down the hydration rate.

The invention relates to the field of mortar, in particular to a high-strength fireproof mortar and a preparation process thereof. Aluminum hydroxide is used as a flame retardant, and the aluminum hydroxide is modified. First, (3-mercaptopropyl) trimethoxysilane is used to thiolize the surface of the aluminum hydroxide, and then a flame retardant monomer containing double bonds and a vinyl branched polysiloxane are introduced on the surface of the aluminum hydroxide by photo-clicking of the mercapto-double bonds. The flame retardant monomer containing double bonds is a flame retardant monomer prepared by modifying a small molecule flame retardant adenosine monophosphate with glycidyl methacrylate. The vinyl branched polysiloxane is a hyperbranched polysiloxane containing a large number of Si-O bonds and double bonds synthesized from dipropylene glycol and vinyl triethoxysilane. Allyl polyoxyethylene ether, a raw material of a high-efficiency polycarboxylic acid water reducer, is used as the main chain, and vinyl branched polysiloxane with strong reaction activity and acrylic acid with strong hydrophilicity are grafted to prepare an organosilicon-modified polycarboxylic acid water reducer with strong hydrophilicity, high reaction activity and high water reduction effect.

This invention belongs to the field of building materials technology, and relates to a smart responsive concrete admixture, its preparation method, and its application. The smart responsive concrete admixture includes a main chain and at least one smart responsive side chain and at least one nano-reinforcing side chain bonded to the main chain. The main chain includes polyether structural units and unsaturated carboxylic acid structural units. The smart responsive side chain includes block copolymer temperature-sensitive structural units and calcium ion strongly chelating structural units. Composite nanoparticles are bonded to the nano-reinforcing side chains. From the inside out, the composite nanoparticles consist of a silica core, a soluble calcium source layer, and a silane coupling agent layer. The smart responsive concrete admixture provided by this invention, by introducing smart responsive side chains and nano-reinforcing side chains onto the main chain, can decouple setting time from temperature control, thereby reducing the adiabatic temperature and maximum heat release rate while ensuring early strength.

The present application relates to the field of refractory technology, and in particular to a heat-insulating and energy-saving refractory castable and a preparation method thereof. A heat-insulating and energy-saving refractory castable, by mass, includes the following raw materials: 35-40 parts of porous alumina aggregate, 3-5 parts of modified short-cut zirconium-containing refractory fiber, 8-10 parts of coke gemstone fine powder, 3-5 parts of kyanite powder, 5-6 parts of alumina micropowder, 2-3 parts of spodumene powder, 1-3 parts of binder, 0.2-0.3 parts of water reducer, and 0.2-0.3 parts of dispersant. The heat-insulating and energy-saving refractory castable and its preparation method of the present application not only improve the material performance, but also take into account environmental protection, cost and construction convenience. The prepared castable not only has light bulk density and good thermal insulation performance, but also performs well in flexural strength, compressive strength and thermal shock resistance stability, meeting the complex requirements of high-temperature industrial environments.

This invention discloses a method for preparing a water-retaining and retarding polycarboxylate superplasticizer, belonging to the field of concrete admixture technology. The method includes: using pentenol polyoxyethylene ether and / or methyl allyl polyoxyethylene ether, hydroxyethyl acrylate, hydrogen peroxide, vitamin C, mercaptopropionic acid, acrylic acid, and phosphorus-containing compounds as raw materials, a polycarboxylate superplasticizer is prepared via free radical polymerization; then, hydroxyl and carboxyl compounds are added sequentially for slow modification; after adjusting the system to a strongly alkaline state, refined cotton powder, chloromethane, and propylene oxide are added, and an etherification and crosslinking reaction is carried out under pressure and heating conditions; finally, the product is obtained by pressure filtration, pulverization, and drying. The polycarboxylate superplasticizer prepared by this invention possesses excellent water retention and retarding effects, effectively reducing concrete bleeding and segregation, extending setting time, improving concrete workability and durability, and exhibiting good compatibility with cement, making it suitable for high-temperature construction, large-volume concrete, and manufactured sand concrete projects.

The invention discloses a secondary fluidization first-aid agent for concrete and a preparation method of the secondary fluidization first-aid agent, and relates to the field of constructional engineering materials. The secondary fluidization emergency agent is prepared from the following components in parts by weight: 180 to 220 parts of water reducing type polycarboxylic acid water reducing agent mother liquor, 90 to 110 parts of slow release type polycarboxylic acid water reducing agent mother liquor, 27 to 33 parts of amino water reducing agent, 9 to 11 parts of hydration heat inhibitor, 9 to 11 parts of water-based penetrating agent, 27 to 33 parts of viscosity reducer, 0.018 to 0.022 part of defoaming agent, 0.18 to 0.22 part of air entraining agent and 600 to 640 parts of water. The secondary fluidization emergency agent for the concrete can effectively reduce hydration heat, and has the advantages of being small in dosage, good in water reducing effect, full in slurry, low in viscosity, small in secondary slump loss, high in expansion degree, appropriate in initial setting time, low in strength loss after secondary fluidization of the concrete and the like.

The present invention relates to a novel polycarboxylate water-reducer and a preparation method thereof, wherein the novel polycarboxylate water-reducer is generated by polymerization reaction of compound A, compound B, unsaturated macromonomer, unsaturated carboxylic acid and / or unsaturated carboxylic acid anhydride under the action of an initiator and a molecular weight regulator; the mass ratio of the unsaturated macromonomer, compound A, compound B, unsaturated carboxylic acid and / or unsaturated carboxylic acid anhydride is 180:(1-5):(1-10):(5-30). The present invention introduces compound A into the molecular structure of the polycarboxylate water-reducer through copolymerization reaction, so that the main chain side group has a benzene ring and a carboxyl group or a sulfonic acid group, and the carboxyl group or the sulfonic acid group provides electrostatic repulsion, thereby enhancing the water-reducing effect; the benzene ring makes the obtained polycarboxylate water-reducer molecule more stretched after being adsorbed on the surface of cement particles, and the steric hindrance effect is more obvious, and finally the water-reducing rate of the product is also higher.

The invention discloses a polypropylene imitation steel fiber permeable concrete and a preparation method thereof, and belongs to the technical field of concrete. The preparation method is as follows: comprising the following steps: washing all melon seeds used in the test to remove surface sand and impurities, drying and sieving through a drying box; stirring and mixing melon seeds, cement, silica fume, reinforcing components, and water reducers to obtain a premix; adding water, continuing stirring, and obtaining a mixture; dispersing smooth polypropylene imitation steel fibers into uniform multiple portions, adding them to the mixture one by one, and obtaining a fiber mixed slurry; injecting the fiber mixed slurry into a mold to complete the pouring; covering with a plastic film after pouring, and demolding after filming at room temperature. For concrete materials, as a pavement material for urban road paving, it has the characteristics of high strength and good water permeability, and the materials selected for preparation have the characteristics of low carbon and environmental protection.

The present invention belongs to the technical field of concrete admixtures, and specifically relates to a water reducing agent for concrete and a preparation method thereof. The preparation method comprises the following steps: adding montmorillonite to a stearyl trimethyl ammonium chloride solution, adding zinc chloride, adjusting the pH, stirring the reaction, calcining the obtained product, obtaining pretreated montmorillonite, adding the montmorillonite, aluminum nitrate and magnesium nitrate to water, adding sodium hydroxide and sodium carbonate, stirring the reaction to obtain a first modified montmorillonite, adding the montmorillonite to water and dispersing it uniformly, adding a surfactant, adjusting the pH, stirring the reaction to obtain a second modified montmorillonite, adding the montmorillonite and allyl polyoxyethylene ether to concentrated sulfuric acid, stirring the reaction, adding the product, sodium methacrylic acid, methacrylic acid, and hydroquinone to water to obtain a solution A, taking an initiator and adding it to water to obtain a solution B, respectively dropping the solution A and the solution B into water, and then keeping warm, adjusting the pH, collecting the product, and adding nano-hydroxyapatite to the product to obtain the product.

The invention relates to the technical field of cement additives, specifically to a cement grinding aid with a water-reducing function and a processing technology thereof; in order to enhance the cement grinding efficiency, the invention prepares a cement grinding aid with a branched structure, introduces a polyether segment with a water-reducing function by limiting the reaction conditions and selecting the reaction raw materials, and retains the phosphoric acid group and the carboxylic acid group structure, thereby ensuring that the grinding aid prepared by the invention has a large number of active sites on its surface, can be combined with cement particles, coated on its surface, reduce the friction between cement particles, adjust the electrical properties of the cement particle surface, reduce the agglomeration phenomenon between cement particles, and promote the improvement of grinding efficiency.

The invention relates to the technical field of concrete, and particularly discloses concrete for a C50 prestressed fabricated box girder and a preparation method of the concrete. The concrete for the C50 prestressed fabricated box girder is prepared from the following raw materials in parts by weight: 400 parts of cement; 150 to 160 parts of water; 100 parts of mineral powder; 30 parts of fly ash; 600 to 700 parts of natural sand; 100 to 150 parts of stone chips; 500 to 600 parts of limestone; 400 to 500 parts of natural river stone; 3-4 parts of a composite water reducing agent; 7-8 parts of other additives; the composite water reducing agent is an esterification product of graphene oxide and PCE, and the other additives comprise a water-retaining agent and an air entraining agent; the preparation method comprises the following steps: mixing the raw materials, and uniformly stirring to obtain the concrete for the C50 prestressed fabricated box girder. The concrete provided by the invention has the advantages of excellent anti-pressure ability and good fluidity.

The invention relates to the technical field of water reducers, and in particular to a method for preparing a biomass-based water reducer. The raw materials include 20-40 parts of cassava starch, 40-60 parts of bagasse, 8-12 parts of ammonium acrylate, 5-10 parts of methyl allyl alcohol polyoxyethylene ether, 1-2 parts of ammonium persulfate, 6-9 parts of an oxidant, 3-5 parts of a sulfonating agent, and 3-5 parts of a preservative. The cassava starch and bagasse are thermally decomposed with anhydrous ethanol, separated and washed to obtain an organic phase and a solid mixture, the organic phase is sulfonated, hydrogen atoms in the solid mixture are electrophilically substituted by sulfonic acid groups, and active OH in a benzene ring is easily grafted under an initiator to form a water reducer. The method reduces the consumption of organic matter in the water reducer by bacterial rate, ensures the long-term use of the water reducer, and has a good water reducing effect. The water reducer adsorbs more cement particle surfaces, the steric hindrance effect is enhanced, the amount of water reducer entering concrete or cement particle gaps is reduced, invalid adsorption is reduced, the dispersed flow between particles is promoted, and the cement fluidity is increased.

The application discloses an early-strength heat-insulation type light plastering gypsum mortar and a preparation method thereof. The early-strength heat-insulation type light plastering gypsum mortar comprises the following raw materials in parts by weight: 550-800 parts of gypsum powder, 100-300 parts of heavy calcium, 100-300 parts of light aggregate, 50-100 parts of inorganic retarder, 1-5 parts of early-strength water reducing agent, 1-5 parts of reinforcing agent, 1-4 parts of cellulose ether, 5-15 parts of redispersible latex powder and 400-450 parts of water. The early-strength water reducing agent is prepared by reacting high-purity gypsum and polycarboxylic acid water reducing agent solution, and high-activity functional groups in the polycarboxylic acid water reducing agent are inlaid on the surface of fibrous calcium sulfate whiskers. The light aggregate is prepared from autoclaved aerated concrete. The inorganic expanding agent is used to adjust the setting time, the early-strength water reducing agent and the reinforcing agent are used to improve the compressive strength and bonding strength of the gypsum mortar, and the autoclaved aerated concrete is used to replace traditional light aggregates such as vitrified small balls and expanded vermiculite, so that the heat preservation performance of the gypsum mortar is improved.