14results about How to "Good retarding effect" patented technology

The invention relates to low-cost retarded concrete and a preparation method thereof. The low-cost retarded concrete comprises the following components in parts by weight: 24-27 parts of cement, 6-8 parts of blast furnace slag powder, 5-8 parts of fly ash, 70-90 parts of fine aggregate, 2-7 parts of sludge incineration ash, 93-100 parts of coarse aggregate, 0.4-0.6 part of a water reducing agent, 0-0.25 part of a retarder and 12-21 parts of water. When the temperature of the production environment is lower than 30 DEG C, the retarder comprises sodium gluconate; when the temperature of the production environment is higher than or equal to 30 DEG C, the retarder further comprises white sugar. According to the invention, the sludge incineration ash is recycled, phosphate radicals dissolved in the sludge incineration ash are combined with calcium ions generated by cement hydration, and the calcium ions coat the surfaces of cement particles to hinder further hydration of cement, so that the purpose of retarding is achieved, and the cement can be retarded by increasing the mixing amount of the sludge incineration ash and the retarder. The retarded concrete meeting different setting time requirements can be prepared; other components in the sludge incineration ash can be subjected to secondary hydration reaction with calcium hydroxide generated by cement hydration, so that the durability of the concrete can be improved.

The invention discloses self-compacting concrete and a preparation method thereof, and relates to the technical field of concrete, and the concrete comprises cement, fly ash, mineral powder, water, sand, stone and a modified water reducer. The modified water reducing agent is a polymer prepared from a hydroxyl-containing monomer I, a double-bond-containing acyl chloride monomer II, an unsaturated polyether monomer III and a double-bond-containing monomer IV in a mass ratio of (0.5-1.5): 1: (9-12): 1 through esterification reaction and double-bond addition polymerization, and hydroxyl, carboxyl and a polyether side chain are introduced into a molecular chain of the polymer at the same time. According to the water reducer, through the synergistic effect of hydrogen bond stable adsorption, steric hindrance and electrostatic repulsion, the compressive strength of concrete is improved, the slump is reduced, the balance of super-long retarding and high-strength development is achieved, and the comprehensive performance is excellent.

The preparation method comprises the following steps: S1, accurately weighing a protein raw material, dissolving the protein raw material in deionized water, carrying out high-temperature denaturation under a constant-temperature water bath condition, then adjusting to an enzymolysis temperature, adding protease for enzymolysis, then adding an alkaline substance to adjust the pH value to be neutral, heating in a boiling water bath for enzyme deactivation, and filtering to obtain a filtrate; cooling the enzymatic hydrolysate to room temperature to obtain hydrolyzed protein; s2, deionized water, acid anhydride and hydrolyzed protein are stirred in a constant-temperature water bath; then adding organic alkali or inorganic alkali to adjust the solution to be neutral, and performing powder spraying, drying and sieving to obtain intermediate powder; and S3, adding the sieved gypsum reinforcing agent into the intermediate powder, and uniformly mixing to obtain the retarder powder. The gypsum retarder can exert an excellent retarding effect at an extremely low mixing amount, has better adaptability to industrial byproduct gypsum, is wide in applicability, maintains corresponding setting time under a strong alkali condition, does not significantly increase the mixing amount, and has less influence on absolute dry strength.

This invention belongs to the field of high-efficiency concrete water-reducing agents, specifically relating to a composite polycarboxylate anti-mud water-reducing agent, its preparation method, and its application. The composite polycarboxylate anti-mud water-reducing agent comprises the following raw materials: 30-40 parts by weight of anti-mud polycarboxylate water-reducing agent and 1-3 parts by weight of anti-mud sacrificial agent. The anti-mud polycarboxylate water-reducing agent is polymerized from methyl allyl polyoxyethylene ether and unsaturated carboxylic acid under the initiator and chain transfer agent. The anti-mud sacrificial agent is obtained by adding 4-5 parts by weight of hydrogen peroxide to 20-30 parts by weight of papermaking black liquor. The anti-mud sacrificial agent effectively resists the interference of soil on the polycarboxylate water-reducing agent and is simple to prepare, environmentally friendly, and pollution-free. The composite polycarboxylate anti-mud water-reducing agent prepared by this invention has good anti-mud properties, exhibits good dispersibility in mud-containing concrete, and also has good slump retention properties.

The invention relates to the technical field of oil wells, in particular to a sulfonate retarder as well as a preparation method and application thereof. The sulfonate retarder has the following structural formula: # imgabs0 #, wherein X is 16-23, Y is 6-11, and Z is 2-6. The preparation method comprises the following steps: A, dissolving sodium hydrogen sulfite and sodium sulfite in deionized water, adding epoxy chloropropane for reaction, and then adding sodium hydroxide for reaction; carrying out suction filtration, washing and drying to obtain a sulfonate intermediate; b, dissolving the sulfonate intermediate and vinyl imidazole in deionized water for reaction, then adding anhydrous sodium carbonate for continuous reaction, removing the solvent after reaction, and purifying to obtain a sulfonate monomer; c, a sulfonate monomer and itaconic acid are dissolved in deionized water, then 1-allyl-3-methyl imidazole chloride and an initiator are dropwise added into the system, a reaction is conducted, and a sulfonate retarder is obtained; the sulfonate retarder provided by the invention ensures the original retarding performance, is suitable for the ultra-deep well cementing process, meets the extreme cementing construction requirements, and has a good application prospect.

The invention discloses a preparation method of a retarder for compounding a multi-component cementing material, which comprises the following steps: by taking a polyalcohol acid organic matter as a raw material, introducing an active alkenyl monomer, grafting a protein component containing multi-amino carboxyl, and introducing a main functional group for adjusting the coagulation time of gypsum and a composite material, thereby obtaining the retarder. Through the mode, the retarder for the composite multi-element cementing material and the preparation method have the advantages that the retarding effect of a gypsum composite cementing material can be improved, the yield of condensation and polymerization reaction can be improved, the retarding degree difference can be effectively reduced, the adaptability and the sensitivity are better, and the application field is wider.

The invention relates to the technical field of 3D printing concrete, in particular to low-carbon 3D printing alkali-activated composite cement mortar and a preparation method thereof.The mortar is prepared from, by weight, 400-500 parts of low-calcium fly ash, 300-400 parts of granulated blast furnace slag, 180-220 parts of ordinary Portland cement, 1400-1600 parts of quartz sand, 47.5 parts of solid sodium carbonate, 10 parts of solid citrate and 359-370 parts of water. The preparation method comprises the following steps: preparing an alkali activator by using sodium carbonate, citrate and water as raw materials, and standing at normal temperature; preparing the low-calcium fly ash, the granulated blast-furnace slag, the Portland cement and the quartz sand according to a preset proportion, and stirring and mixing; and adding the standing alkali activator, continuously stirring, slowly stirring, preliminarily dispersing and mixing, and quickly stirring and mixing to obtain the low-carbon 3D printing alkali-activated composite cement mortar. The carbon emission can be reduced, and the safety can be improved.

The invention relates to the technical field of retarders for well cementation, in particular to a retarder for high-temperature-resistant and high-strength cement paste and a preparation method of the retarder for the high-temperature-resistant and high-strength cement paste. The quinary copolymer retarder is prepared from 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid sodium p-styrenesulfonate, vinyl pyrrolidone and acrylic acid phosphate. The quinary copolymer retarder is prepared by the following steps: adding the quinary copolymer retarder, sodium borate and sodium tripolyphosphate into water, uniformly mixing, and carrying out chelation reaction. The retarder for the high-temperature-resistant and high-strength cement paste can obviously prolong the thickening time of the cement paste under high-temperature and high-pressure conditions, can also enable the cement paste to keep good sedimentation stability, and solves the problem that the existing retarder easily causes poor high-temperature sedimentation stability of the cement paste.

The invention relates to a high-temperature-resistant oil well cement retarder and a preparation method thereof. The problems of poor high temperature resistance and poor adaptability of the existing retarder are mainly solved. The invention is characterized in that the composition comprises the following components in parts by mass: 1-3 parts of a compound molecular emulsifier, 95-99 parts of a hydrophilic monomer, 1-5 parts of a hydrophobic monomer, 1-5 parts of an initiator, 390-470 parts of deionized water, and 45-85 parts of a 30% W / W NaOH solution. The preparation method comprises the following steps: adding a hydrophilic monomer into a first part of deionized water in proportion, after the hydrophilic monomer is completely dissolved, adding a compound molecular emulsifier, dropwise adding a NaOH solution at the temperature of 15-30 DEG C, stirring, adding a hydrophobic monomer, introducing nitrogen, and heating for 30 minutes to obtain a to-be-reacted solution; dissolving the initiator with a second part of deionized water, adding into the to-be-reacted liquid, introducing nitrogen, heating to 60 DEG C, and reacting for 5 hours; the oil well cement retarder can be suitable for well cementation of ultrahigh-temperature wells at 240 DEG C, and has good adaptability to quality fluctuation of oil well cement.

The application discloses a preparation method and application of manganese gypsum, and the method is characterized by the following steps: uniformly mixing manganese sulfate residue, red mud, desulfurization ash and water, stirring into slurry, and aging for a period of time to obtain the product manganese gypsum which can be used as a cement retarder. In the application, the alkaline solid waste red mud and desulfurization ash are added to the manganese residue, and the calcium sulfite in the desulfurization ash is oxidized in the mixing process, thereby modifying the manganese residue and improving the sulfur content in the manganese gypsum and the retarding effect. The preparation method is simple, the manganese residue disposal amount is large, the manganese residue is innovatively prepared into the retarder required by cement production, and the preparation method does not need high-temperature treatment and does not consume electric energy, so that the energy consumption is reduced. Finally, the difficult-to-handle manganese residue, red mud and desulfurization ash are solidified and treated to prepare the retarder required by cement production, the manganese residue is converted into a resource which can be directly used in the building material industry, the resource utilization of the waste is realized, the application is simple and practical, and the purpose of reducing cost and increasing efficiency is achieved.

The application discloses a kind of quick repair mortar and preparation method thereof, according to weight fraction, quick repair mortar raw materials include coating modified magnesium oxide 300-500 parts, phosphate 100-150 parts, setting regulator 0-50 parts, quartz sand 300-600 parts, finely ground admixture 60-100 parts, rheological agent 5-20 parts.Each powder is mixed uniformly, and a proper amount of mixing water is added to stir uniformly and can be used.The application can reduce the reactivity of magnesium oxide at a lower calcination temperature by surface coating modification of magnesium oxide particles, thereby prolonging the operable time of magnesium phosphate cement-based repair material, and forming an in-situ polymer modified layer on the surface of magnesium oxide particles, enhancing the bonding performance of magnesium phosphate gel with other powders and aggregates.In addition, the application can utilize red mud, nickel slag and other harmful solid waste as resources, and the aluminum phase and iron phase can react with phosphate to form new mineral phases, improving the mechanical and durability properties of magnesium phosphate materials.

The present invention discloses a phosphorylated protein-based gypsum retarder and a preparation method thereof, and belongs to the technical field of building material retarders. The present invention reacts a phosphate group with a hydroxyl group on a protein product to prepare a phosphorylated protein-based gypsum retarder. Phosphorylation increases the calcium chelating ability of the protein product. In view of the key role of the chelation of calcium ions in the gypsum system by the protein polypeptide in the gypsum system in the retardation of gypsum, the phosphorylated protein-based gypsum retarder prepared by the present invention can more effectively inhibit the hydration of hemihydrate gypsum and the production of dihydrate gypsum by chelating more free calcium ions in the gypsum system, thereby producing a longer-lasting retarding effect on the gypsum, while avoiding the loss of mechanical strength of the gypsum. In addition, the phosphorylated protein-based gypsum retarder prepared by the present invention can effectively improve the fluidity of the gypsum slurry, which is beneficial to the self-leveling construction of the gypsum slurry.

The present invention relates to the technical field of geopolymer-based building materials, and in particular to a waste gypsum-based geopolymer and a preparation method thereof. Desulfurized gypsum is used as waste gypsum for research and development, and steel slag powder and mineral powder are added as active raw materials after calcination. A dedicated setting agent is prepared to regulate the setting time of the geopolymer, so as to prepare a waste gypsum-based geopolymer with good construction performance, mechanical properties and crack resistance, thereby greatly improving the value of industrial by-products.

The invention belongs to the technical field of decorative concrete material surfaces, and provides a negative retarding latex paint, which comprises 60-90 parts of latex paint, 10-40 parts of a liquid retarder, 10-30 parts of water, 0.5-1.0 part of an anti-settling agent, and 1.0-2.0 parts of a surfactant. The emulsion paint and the retarder are arranged, the retarder can be evenly attached to the surface of the mold through the film forming matter in the emulsion paint, the phenomenon that due to the surface tension of the mold and the external effect, the retarder distribution thickness is uneven is avoided, and the technical effects that the washing depth is uniform, and the aggregate exposure effect is uniform are achieved.