6results about How to "Good anti-mud effect" patented technology

The invention relates to the technical field of cement, and discloses a cement material containing barium slag and a preparation method thereof.The cement material containing the barium slag is obtained by adding the barium slag, fly ash, a polycarboxylate superplasticizer, Portland cement, a boron modified quaternary ammonium salt polymer, modified ferrocene and water into a stirrer and stirring the materials evenly. Iron ions in ferrocene in the boron-modified quaternary ammonium salt polymer can be combined with hydroxyl ions in water to form a ferric hydroxide hydrate, the compound can catalyze the hydration reaction of cement, so that concrete can be hardened more quickly, the mechanical property of the concrete is enhanced, polyurethane contained in the compound can also improve the impermeability of a cement material, and the water resistance of the cement material is improved. The boron element contained in the cement can improve the durability of the cement, the sulfonic group can improve the fluidity of the cement, and the quaternary ammonium salt structure contained in the cement has a good anti-mud effect. Silicone rubber contained in the modified ferrocene can also improve the fluidity and impermeability of the cement.

The present invention discloses a method for repairing concrete cracks at low temperature, its application and a concrete crack repairing agent, which belongs to the technical field of on-site processing of building materials and repair of existing buildings. In the method for repairing concrete cracks at low temperature of this scheme, a repairing agent with a low-temperature early strength agent of a string-stool-type structure component is used. The low-temperature early strength agent of the string-stool-type structure component is obtained by first subjecting the string-stool-type structure main chain obtained by ring-opening polymerization to an alkali-catalyzed reaction to obtain an incompletely condensed string-stool-type structure, and then reacting with the monomers to substitution-catalysis-copolymerization and substitution-ATRP reaction. This scheme can reduce the viscosity of the repair material by adding a low-temperature early strength agent of a string-stool-type structure component to the repair material, improve its early strength, fast hardening and adaptability, and is particularly suitable for repairing concrete cracks in a low-temperature environment. The repair material has simple components and good compatibility with concrete at the crack, and can effectively solve the problems of poor adaptability, high viscosity and low strength of the repair material, and has broad prospects for promotion and application.

The invention discloses a phosphating monomer as well as a preparation method and application thereof. The phosphating monomer is prepared from acrylic acid hydroxyl ester, a dispersing solvent, phosphorus pentoxide and a polymerization inhibitor. The phosphating monomer has the following structure: # imgabs0 # R1 and R2 are independently selected from any one of the following groups: # imgabs1 # imgabs2 # imgabs3 #. The preparation process of the phosphating monomer provided by the invention is simple, the phosphating monomer can be prepared by using conventional water reducing agent generation equipment, other equipment does not need to be purchased, the equipment consumption is greatly reduced, the energy consumption is low, and the phosphating monomer has good economical efficiency; the prepared polycarboxylate-type water reducer has good dispersion and mud resistance, and besides, the polycarboxylate-type water reducer has a phosphate group with strong adsorption capacity and a carboxylic acid group, so that a better water reducing effect is provided; the novel monomer is synthesized to directly replace an acrylic monomer in the synthetic raw materials of the polycarboxylate superplasticizer, so that the polycarboxylate superplasticizer has better dispersing performance and mud resistance.

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 provides a nano-composite super-early-strength polycarboxylate superplasticizer and a preparation method and application thereof.The preparation method comprises the following steps that 1, a polyether macromonomer, a reducing agent, a functional monomer, an oxidizing agent and deionized water are added into a reaction container and stirred at the temperature of 25-45 DEG C till all the components are dissolved, and a reaction solution A is obtained; step 2, simultaneously dropwise adding an acrylic acid solution and a vitamin C aqueous solution into the reaction solution A in a stirring state at 25-45 DEG C, heating to 45-65 DEG C after dropwise adding is completed, carrying out a heat preservation reaction for a period of time, and adjusting a reaction system to be alkaline by using an alkaline compound and / or an aqueous solution of the alkaline compound to obtain a reaction solution B; and step 3, adding a calcium nitrate aqueous solution and a sodium silicate aqueous solution into the reaction solution B at 0-10 DEG C, and stirring to react for 30-60 minutes to obtain a finished product. The concrete early strength improver has the beneficial effects that the early strength of concrete is remarkably improved, the mixing amount is low, the water-reducing rate is high, the slump loss resistance is strong, the mud resistance is good, the preparation method is simple in process, the energy consumption is low, the production period is short, and industrial production is easy.

The present invention relates to a polycarboxylate water-reducing agent prepared from a cationic monomer and a preparation method thereof. The raw materials for preparing the polycarboxylate water-reducing agent prepared from the cationic monomer include, by weight: 100 parts of an ester-terminated polyether monomer; 100 parts of a high molecular weight polyether monomer; 2-10 parts of a cationic monomer; 4-10 parts of a functional monomer; 5-12 parts of an unsaturated acid; 0.2-3 parts of a molecular weight regulator; 0.1-2 parts of a reducing agent; 0.5-5 parts of an oxidant; and 150-300 parts of water. The present invention introduces an ester-containing unsaturated polyether monomer into the polycarboxylate water-reducing agent, which has a diverse molecular structure, adjustable hydrophilicity and lipophilicity, and controllable molecular weight. Compared with a traditional water-reducing polycarboxylate water-reducing agent, the polycarboxylate water-reducing agent prepared by the present application has better workability and dispersion retention performance; the cationic monomer is introduced, and the cations contained in the polycarboxylate water-reducing agent reduce the adsorption of soil to an admixture, so that the water-reducing agent molecule has good mud resistance and improves the adaptability of the water-reducing agent.