15results about How to "Good slump performance" patented technology

The invention belongs to the technical field of preparation of water reducing agents, and particularly relates to a slump-loss-free super-slow-release type water reducing agent mother solution and a preparation process thereof. The method comprises the following steps: copolymerizing a phosphoric acid functional monomer, an amide functional monomer, a polyether monomer and unsaturated carboxylic acid to obtain a mother solution of the super-slow-release water reducing agent; functional groups such as acylamino and ester groups introduced on a molecular chain of the water reducer can be slowly hydrolyzed into anion anchoring groups such as carboxyl in an alkaline environment, so that secondary adsorption of the water reducer and cement particles is promoted, and the water reducer has relatively long slump retaining performance and relatively high compressive strength.

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 relates to the technical field of building materials, and discloses an alumino-ferroate cement water reducer and a preparation method thereof. The prepared unsaturated zwitterionic cyclodextrin is polymerized with maleic anhydride and acrylic acid to obtain the alumino-ferroate cement water reducer. The cyclodextrin has a hollow cylindrical stereoscopic structure, which brings a significant steric hindrance effect to the polymer. The sulfonic acid groups on the main chain of the water reducer are anchored on positively charged cement particles to generate strong adsorption. The quaternary ammonium salt cations can be adsorbed on the surface of the negatively charged cement particles, so that the cement particles can achieve a better dispersion effect and the fluidity of the cement paste is improved. The presence of the cyclodextrin side chain and the polyethylene glycol long chain affects the cement hydration process, can effectively weaken the interpenetration between the water reducer molecules and the clay layer, enriches the preparation method of the synthetic alumino-ferroate cement water reducer, and is easy to realize industrial production.

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 invention relates to the technical field of building materials, and discloses an aluminoferrite cement water reducing agent and a preparation method thereof.The prepared unsaturated zwitterionic cyclodextrin, maleic anhydride and acrylic acid are subjected to a polymerization reaction, and the aluminoferrite cement water reducing agent is obtained; cyclodextrin has a hollow cylindrical three-dimensional structure and brings a remarkable steric hindrance effect to the polymer; a sulfonic acid group on a main chain of the water reducing agent is anchored on positively charged cement particles to generate strong adsorption; quaternary ammonium salt cations can be adsorbed on the surfaces of cement particles with negative charges, so that the cement particles achieve a better dispersion effect, and the fluidity of cement paste is improved; the existence of a cyclodextrin branched chain and a polyethylene glycol long chain affects the hydration process of the cement, so that the interpenetration effect between water reducing agent molecules and clay layers can be effectively weakened, the preparation method for synthesizing the iron aluminate cement water reducing agent is enriched, and industrial production is easy to realize.

The invention discloses a terrazzo for a combined layer. The terrazzo is prepared from the following components in parts by weight: 750 to 850 parts of white cement, 100 to 160 parts of silica powder, 150 to 220 parts of calcium-silicon mineral admixture, 900 to 1100 parts of white quartz sand, 100 to 120 parts of coarse aggregate, 5 to 10 parts of alkali-resistant glass fiber, 10 to 100 parts of toner, 170 to 200 parts of water, 4 to 6 parts of modified cellulose ether, 1 to 1.5 parts of defoaming agent and 25 to 35 parts of polycarboxylate superplasticizer. The modified cellulose ether is borate crosslinking modified cellulose ether. The terrazzo decorative layer material has excellent anti-sagging performance, mechanical performance and durability, has certain thixotropy, is suitable for structural design of various special-shaped combined layers with various facades and curved surfaces, and can effectively widen the application range of terrazzo in the field of decoration-structure integrated design.

The invention discloses a slump-retaining water reducer mother liquor and a preparation method thereof, and the slump-retaining water reducer comprises the following raw materials: alkylene alkenyl polyoxyethylene ether, hydrogen peroxide, an acrylate polymerization initiator mixture, an acrylate copolymerization initiation solution, a lipid-containing gel substance, a sodium hydroxide solution and deionized water. The lipid-containing gel substance can enhance the water-retaining property of the water reducer and reduce the water loss of concrete in the stirring and transportation processes, so that the stability of the concrete is improved, sedimentation and layering are prevented, the lipid-containing gel can react with free chloride ions in water to generate a water-insoluble gel substance, the permeability of the concrete is reduced, and the water-retaining property of the concrete is improved. The water reducing agent is favorable for improving the durability of concrete and reducing permeation of moisture and harmful chemical substances, so that the service life of the concrete is prolonged, the water reducing efficiency of the water reducing agent is improved, good workability of the concrete is allowed to be kept under the condition of lower dosage, meanwhile, the flowability and plasticity of the concrete are improved, and pouring and forming are facilitated.

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 a collapse-preserving polycarboxylic acid water-reducing agent prepared from an ester-terminated unsaturated polyether monomer and a preparation method thereof. The structural formula of the ester-terminated unsaturated polyether monomer is as follows: wherein R1 and R2 are (CH2) n , n is an integer of 2-8; R3 is C1-C 12 The ester-terminated unsaturated polyether monomer prepared by the present invention has various molecular structures, adjustable hydrophilicity and lipophilicity, and controllable molecular weight. Compared with the traditional collapse-retaining polycarboxylic acid water-reducing agent, the ester-terminated polyether is gradually hydrolyzed in concrete, so that the prepared water-reducing agent has a higher retention capacity.

The application discloses a super-long-time slump-retaining concrete, which comprises a cementitious material system, a light aggregate system, a composite admixture system and water; the components and their dosages in each cubic meter of the concrete include: the cementitious material system 400-450 kg, the light aggregate system 1200-1400 kg, the water 200-220 kg, and the composite admixture system 2.0-3.0% of the mass of the cementitious material system; wherein the cementitious material system takes phosphogypsum, cement, mineral powder, glass microbeads and microsilica powder as main raw materials; and the composite admixture system takes a phosphoric acid group modified retarding type polycarboxylate water reducer, a water-retention and thickening component, an alkali-activated component, an air entraining agent and water as main raw materials. The setting time of the concrete can reach 100-120 h, and the mix can still maintain good workability after 72 h, so that the realization of synchronous cutting and pouring concrete continuous wall process and the like can be effectively ensured, and the application is suitable for popularization and application.

The invention provides an anhydride low-sensitive polycarboxylate superplasticizer as well as a preparation method and application thereof, maleic monoester subjected to alcoholysis of maleic anhydride and ethylene oxide are subjected to ring opening polymerization to prepare an intermediate, carboxyl in maleic ester is esterified by ethylene oxide, part of carboxylic acid is protected, main chain cross-linking is prevented, and the anhydride low-sensitive polycarboxylate superplasticizer is prepared. The quality of the polymer is improved; later-stage precipitation is prevented; the slump retaining performance of the slump retaining agent is further improved by protecting carboxyl through esterification, so that the doping amount of the slump retaining agent in the application process of the water reducing agent is lower, and the effect is more obvious. Compared with the prior art, the high-conversion-rate low-sensitivity viscosity reduction type mother liquor is synthesized through copolymerization of the isopentenol polyoxyethylene ether, the maleic anhydride and the functional monomer of the maleic anhydride, the solid content of a base solution and the use amount of a catalyst are adjusted, so that the high-conversion-rate low-sensitivity viscosity reduction type mother liquor can be subjected to a polymerization reaction at the normal temperature, and the reaction energy consumption at the normal temperature is low. The maleic anhydride functionalized intermediate participates in the free radical polymerization reaction, and the monomer conversion rate of the reaction product is generally higher than 80%.

The invention discloses a concrete water reducing agent and a preparation method thereof, and belongs to the technical field of water reducing agents, firstly, the concrete water reducing agent provided by the invention is prepared from the following raw materials in parts by mass: 72-78 parts of an aliphatic water reducing agent, 12-14 parts of a slump retaining aid, 2-3 parts of hydroxypropyl methyl cellulose ether and 4-5 parts of a retarder. The concrete water reducing agent finally prepared by adding the self-made slump retaining auxiliary agent into the aliphatic water reducing agent shows excellent slump retaining performance, and the principle is as follows: the prepared slump retaining auxiliary agent has rich phosphate groups, ester groups and nitrogen atoms, and meanwhile, the slump retaining auxiliary agent is of a macromolecular chain segment structure, so that the slump retaining effect is good, and the slump retaining effect is good. All the components play a key role in improving the slump retaining performance of the finally prepared aliphatic water reducer.

The invention provides a molasses fermentation concentrated solution copolymerization modified polycarboxylic acid water reducing agent, a preparation method and application. The preparation method comprises the following steps: under the action of a chain transfer agent for inhibiting miscellaneous sugar and an initiator, carrying out polymerization reaction on a molasses fermentation concentrated solution, an unsaturated polyoxyethylene ether monomer, an unsaturated carboxylic acid polymeric monomer and a reducing agent to obtain the molasses fermentation concentrated solution copolymerized and modified polycarboxylate superplasticizer, the chain transfer agent for inhibiting miscellaneous sugar is C16-C20 straight-chain or branched-chain mercaptan, and the density of the molasses fermentation concentrated solution is greater than or equal to 1.25 g / cm < 3 >. The synthesis method is simple and easy to implement, mild in reaction condition and short in reaction time. The molasses fermentation concentrated solution copolymerized and modified polycarboxylic acid high-performance water reducing agent prepared by the invention can effectively improve the workability and the flowability of concrete and improve the strength of the concrete.

The present invention relates to a modified mineral admixture concrete and a preparation method thereof, and belongs to the technical field of building materials; the present invention uses fly ash admixture, silicate cement, sand, acrylic acid, sodium hypophosphite, sodium formaldehyde sulfoxylate, ammonium persulfate, and modified water reducer as raw materials to prepare a modified mineral admixture concrete; the present invention also discloses a preparation method of the modified mineral admixture concrete, including first preparing a water reducer mother liquor, then mixing the fly ash admixture with cement and sand to obtain a mixture, and finally adding the water reducer mother liquor to the mixture to obtain the modified mineral admixture concrete. The preparation method of the modified mineral admixture concrete of the present invention is simple, the raw materials are easy to obtain, the strength after curing is high, the compressive strength after curing for 28 days can reach up to 51.6MPa, the initial fluidity is good, the collapse retention is excellent, and it can be widely used in the construction field.