35results about How to "Strong slump retention" patented technology

The invention provides water-plastic retaining polycarboxylic acid water reducer and a method for preparing same, belonging to the technical field of the cement dispersant. The water-plastic retaining polycarboxylic acid water reducer is characterized by being prepared in nature through copolymerizing a big water-plastic retaining monomer and a small water-plastic retaining monomer, wherein the big water-plastic retaining monomer is prepared by mixing a big ester monomer with a small ester monomer. Prepared from the big water-plastic retaining monomer, the water-plastic retaining polycarboxylic acid water reducer can well retain the water and the plastic of concrete which is prepared through stirring different cement and different aggregate, and the ubiquitous problems of the segregation due to water bleeding and the quick slump loss are effectively solved. The water is used as solvent for the polymerization reaction, which is good for the industrial production and ensures the safe and environmental-friendly production process.

The invention discloses a polycarboxylate-type high-performance cement water-reducing agent, which is prepared by copolymerizing vinyl polyoxyethylene ether which is taken as a big monomer, a mixture of derivatives of binary anhydride and micro-molecular monohydric alcohol or dihydric alcohol as well as derivatives of maleic anhydride and amino acid taken as an unsaturated monomer, and an acrylic monomer which is comparatively high in activity. The water-reducing agent disclosed by the invention is low in cost, good in dispersion, excellent in slump loss resistant property, high in strength of the concrete, and high in cost performance.

The invention provides a foam control agent and an air-entraining water reducing compounding agent and concrete prepared thereof. The foam control agent is mainly formed by compounding the following components by weight: 5-40% of an alkynol wetting agent E20, 40-70% of an alkynol wetting agent E40, 20-50% of an alkynol wetting agent E65, and the balance other accessories. The foam control agent has double technical effects of air entraining and foam control, can control the foam density and the foam size of a system, makes foams more uniform, eliminates big harmful foams, and makes the cement strength, stability and other properties improved.

The invention discloses a preparation method of polycarboxylic acid water reducer, which is suitable in Gale Area of Xinjiang. The water reducer is prepared by polymerizing 20-60 percent of methyl and alkenyl polyoxyethylene polyoxypropylene ether (OXAB-501), 10-30 percent of acrylic acid (AA) and 20-60 percent of three monomers of fumaric acid as the raw materials under the action of H2O2-rongalite redox initiator. The concrete made out of the above water reducer has the advantages of favorable collapse performance, no environmental pollution, more effective ingredients and higher water reducing rate. Preparation method of the water reducer has the characteristics of simple operation and low cost, thereby providing the technical support for concrete construction in Gale Area of Xinjiang.

The invention relates to a method for synthesizing a modified aminosulfonate superplasticizer from wastewater produced in the K acid production process. According to the method, the modified aminosulfonate superplasticizer is prepared from wastewater produced in the K acid production process, sodium sulfanilate and a compound of phenolic hydroxyl. The synthesized modified sulfamic acid has higher concrete water-reducing rate and excellent slump maintaining performance, and more importantly, a new way for comprehensive utilization of wastewater of a dye intermediate is developed. The cost of raw materials of the superplasticizer is reduced, the environment pressure in the production process of the dye intermediate is also reduced, and the method has good economic and environmental benefits.

The invention discloses a method for preparing a phosphate functional monomer by a P2O5 dispersion method and application. The invention relates to a method for synthesizing a phosphate functional monomer by feeding a polymerizable unsaturated organic compound dispersed P2O5, wherein a polymerizable unsaturated organic compound dispersing agent used in a synthesis process can participate in a subsequent polymerization reaction, thereby solving the problems of difficult separation and recovery of a low-boiling-point and toxic organic solvent adopted in a preparation process of an existing phosphate functional monomer and environmental pollution, and simultaneously simplifying the synthesis route of the phosphate functional monomer. The invention also discloses a method for preparing a high-performance polycarboxylate superplasticizer by taking a phosphate functional monomer solution with a polymerizable unsaturated organic compound as a solvent as a third monomer of a polycarboxylate superplasticizer, so that the problem of contradiction between dispersion capacity and slump retention capacity of an existing polycarboxylate superplasticizer is solved, and a method for preparing a high-performance polycarboxylate superplasticizer with high dispersion and slump retention capacity and strong cement adaptability is provided.

The invention discloses a slow-release grouting material for steel shell immersed tube grouting and a construction method of the slow-release grouting material, and the slow-release grouting materialfor steel shell immersed tube grouting is composed of quick-hardening Portland cement, microbeads, superfine slag powder, quartz sand, a composite functional component and water. The composite functional components comprise an expanding agent, a slow-release water reducing agent, an early strength agent, a quick-acting defoaming agent, a rheological agent, a plastic expanding agent and a slump retaining agent, all the components (except water) are fully premixed into uniform dry powder in a professional factory, the grouting material dry powder and water are stirred in a container by a handheld stirrer according to a specified proportion, wherein the stirring time is not shorter than 3 min, uniform slurry is obtained by stirring, and after standing for not less than 5 minutes, and theuniform slurry can be pumped and grouted. The slow-release grouting material for steel shell immersed tube grouting has the characteristics of good fluidity, long fluidity retention time (more than or equal to 5 hours), accurate vertical expansion rate control, early strength, high strength and the like, and can be compactly filled in a gap between self-compacting concrete and a steel shell in a steelshell immersed tube.

The invention relates to a preparation method of a benzene ring-containing sulfonic block modified polycarboxylic acid slump retaining agent. The polycarboxylic acid slump retaining agent is preparedby adopting a block polymerization method. The preparation method comprises the following steps: copolymerizing a benzene ring-containing monomer and a sulfonic acid monomer under certain conditions to obtain a benzene ring sulfonic block polymer i; the preparation method comprises the following steps: copolymerizing a polyether macromonomer and acrylic acid at normal temperature to obtain a blockpolymer ii, adjusting the ratio of the block polymer i to the block polymer ii, and opening double bonds to prepare the polycarboxylic acid slump retaining agent with the block copolymer by taking hydroxyethyl acrylate as a linking monomer. The polycarboxylic acid slump retaining agent prepared by the invention is prepared by adopting a block method for modification, strong anion groups such as steric hindrance and sulfo groups in a short side chain region are increased by benzene rings to provide anchoring groups, and unsaturated alkyl ester and acrylic acid are connected with a block polymer, so that the water reducing agent has relatively strong slump retaining performance and lasting slurry fluidity.

The invention discloses a concrete composite type superplasticizer, wherein the formula component comprises the following components in parts by mass: 20-35 parts of beta-naphthalene sulfonated formaldehyde condensate, 10-30 parts of polyacrylic acid ether polymer, 3-4 parts of sodium tripolyphosphate, 1-5 parts of potassium sodium tartrate, 1-2 parts of sucrose, 0.5-5 parts of cellulose ether, 2-4 parts of lignin sulfonate, 3-4 parts of acrylic acid, 30-75 parts of hydrogen peroxide and 2-4 parts of mirabilite. The beta-naphthalene sulfonated formaldehyde condensate and the polyacrylic acid ether polymer are set, and under the action of sodium tripolyphosphate, the two kinds of different water reducers are effectively mixed, the slump of concrete is improved and the setting time can be prolonged, and the cellulose ether is added, so that the polycarboxylic acid water reducer can be modified by introducing the cellulose ether-containing monomer and the stereo-hindrance effect of the water reducer can be improved. Meanwhile, the water retention property of cellulose ether can also help disperse cement particles to improve the fluidity of slurry.

The invention provides a solid flaky polycarboxylate superplasticizer and a method for preparing the same by a core-shell emulsion method. The superplasticizer comprises the following components in parts by weight: 18-32 parts of a special methacrylate hydrophobic monomer for emulsification, 7-13 parts of a carboxylic hydrophilic monomer for emulsification, 0.33-0.68 parts of an emulsion initiator, 0.56-0.84 parts of a chain transfer agent for emulsification, 37-62 parts of a carboxyl small monomer, 53-76 parts of an unsaturated sulfonic small monomer, 790-830 parts of a polyether macromonomer, 4-9 parts of a weak chain transfer agent, 3.6-6.8 parts of an azo initiator, 4.2-7.6 parts of an initiator, 2.3-4.2 parts of a strong chain transfer agent, and 3.4-5.6 parts of a pH regulator. The method comprises the following steps: (1) preparing an emulsifier; (2) preparing a nuclear monomer emulsion; (3) preparing a shell monomer pre-emulsion; and (4) preparing the solid flaky polycarboxylate superplasticizer. The polycarboxylate superplasticizer prepared by the core-shell emulsion method has the advantages of single molecular weight, excellent performance, strong adaptability and easiness in storage, is prepared into solid sheets, and is lower in transportation cost and suitable for long-distance transportation.