30results about How to "Improve collapse retention" patented technology

The invention discloses a concrete viscosity regulating agent and a preparation method thereof. The concrete viscosity regulating agent is a ternary polymer prepared through free radical polymerization of monomer GMA-IDA prepared from glycidyl methacrylate and iminodiacetic acid, acrylic acid (AA) or methacrylic acid, and cationic monomer. The concrete viscosity regulating agent is novel in structure, reasonable in design, and simple and safe in production process; conditions are easily controllable; organic solvents polluting the environment are not used in production; and the concrete viscosity regulating agent is a green environment-friendly water-soluble polymer and is easy for industrial production. The concrete viscosity regulating agent has good compatibility with concrete additives like a polycarboxylate superplasticizer, can substantially improve workability of concrete, inhibits the phenomenon of water segregation and separation of concrete in an early stage, improves slump loss resistance of the concrete and has certain anti-mud effect.

The invention discloses a preparation method of a lignosulfonate-modified aminosulfonic acid series high-efficiency water reducer, which uses sodium aminobenzenesulfonate, phenol, and formaldehyde as reactants, sodium hydroxide as an adduct, and formaldehyde as polycondensation Lignosulfonate and acrylic acid are copolymers, and through the stages of dissolution, addition, polycondensation and copolymerization, a lignosulfonate-modified sulfamic acid-based high-efficiency water reducer is obtained. The invention overcomes the shortcoming that the sulfamic acid-based superplasticizer is too sensitive to the dosage, improves the water retention and adaptability, reduces the production cost of the sulfamic acid-based high-efficiency water-reducer, and broadens the range of lignosulfonate. application range.

The invention discloses a concrete synergist and a preparation method thereof. The raw materials are composed of the following components by weight: 20-40 parts by weight of alcohol amine, 6-12 parts by weight of alcohol, 5-10 parts by weight of inorganic salt, phosphine 4-12 parts by weight of acid, 0.05-0.3 parts by weight of air-entraining agent, 0.01-0.05 parts by weight of silicone defoamer, 0.01-0.05 parts by weight of foam stabilizer and 35-60 parts by weight of water, wherein the alcohol amine is monoethanol One or both of diisopropanolamine, aminoethylethanolamine or N,N‑diethylpropanolamine, the alcohol is at least one of diethylene glycol and 1,5‑pentanediol, inorganic salt Potassium pyrophosphate or sodium pyrophosphate. The concrete synergist of the invention has the advantages of non-toxic finished products, uniform dispersion, simple process, no pollution, low energy consumption, easy industrial production, and can effectively improve the workability and slump retention of concrete and increase the strength of concrete. By reducing the amount of cement, the hydration reaction efficiency of cement in concrete can be effectively improved.

The invention discloses a phosphate containing high-adaptability polycarboxylate superplasticizer and a preparation method thereof.The phosphate containing high-adaptability polycarboxylate superplasticizer is prepared through the steps that unsaturated polyether macromonomers, micromonomers, unsaturated phosphate monomers, 2-methacrylic acid-3(N,N-oxalic acid amine)-2 hydroxy propyl ester, an initiator and a chain transfer agent react with water at the temperature of 50-80 DEG C for 3-6 hours, a copolymer is obtained, then the pH value is adjusted to range from 6.0 to 7.0 with alkaline matter, and a settled solution is obtained.Compared with a polycarboxylate superplasticizer, the phosphate containing high-adaptability polycarboxylate superplasticizer has higher adsorption capacity, sulfate in cement can be effectively resisted, the dispersing power of polycarboxylate is greatly improved, the phosphate structure can change the crystal morphology formed at the initial stage of ettringite, and then collapse protecting performance is improved.

The invention discloses a low-cost modified naphthalene-based superplasticizer with high slump-keeping property and a preparation method thereof. The superplasticizer is prepared from the following components in parts by weight: 120-130 parts of industrial naphthalene oil, 50-60 parts of 80% petroleum waste phenol residue, 100-120 parts of concentrated sulphuric acid, 40-80 parts of formaldehyde, 80-100 parts of 30% alkaline solution, 20-40 parts of 35% papermaking black liquor, 12-20 parts of sulphur dioxide and a right amount of water. The prepared superplasticizer is low in production cost, the preparation method is simple and short in period, the problem that cost of naphthalene-based chemical modification is always high is solved, mixed concrete is relatively soft, does not adhere to bottom and has better workability and slump-keeping property, and bleeding ratio is low, so that concrete reinforcement effect is obvious.

The invention belongs to the technical field of concrete admixture preparation, and in particular relates to a polycarboxylate water reducer and a preparation method thereof. The method comprises (1) preparing hydroxyethyl-terminated vinyl polyoxypropylene polyoxyethylene ether; (2) preparing polycarboxylate water reducer; the double-ended vinyl ether small monomers contain alkoxy groups and Contains double bonds; preferably, the vinyl ether monomer is ethylene glycol divinyl ether and / or diethylene glycol divinyl ether. The content of ultra-high molecular weight copolymer in the polycarboxylate water reducer prepared by the method is reduced, the relative molecular weight distribution is normal distribution, the molecular weight distribution is narrow, and there are almost no strong polar ultra-high molecular weight by-products; The reaction rate is controllable, the heat release is mild and stable, avoiding the local detonation phenomenon caused by high temperature during the polymerization reaction, and the monomer conversion rate can be increased to more than 95%.

The invention provides a synergist-containing concrete, which is made of the following raw materials in weight percentage: 10-20% of cement, 25-30% of fly ash, 6-9% of silica fume, and 0.1-0.2% of synergist , the first part of water 4‑6%, coarse aggregate 10‑25%, fine aggregate 10‑25%, water reducing agent 1‑2.5%; synergist is made of the following raw materials by weight: triethanolamine 20‑ 35 parts, 1‑5 parts of sodium tripolyphosphate, 2‑4 parts of tetraethylenepentamine, 2‑3 parts of sodium tungstate, 5‑10 parts of sodium pyrophosphate, 5‑15 parts of allylamine, the second part of water 20‑25 servings. The raw materials of the present invention cooperate with each other to obtain a synergist-containing concrete that reduces the amount of cement, reduces the cost, and ensures that the concrete has better working performance and mechanical performance.

The invention discloses a waste petroleum phenolic residue modified sulfamate high-efficiency water reducing agent and a preparation method thereof. The waste petroleum phenolic residue modified sulfamate high-efficiency water reducing agent is prepared from the following components in parts by weight: 130-140 parts of sodium sulfanilate, 100-200 parts of 80% waste petroleum phenolic residues, 30-60 parts of concentrated sulfuric acid, 50-60 parts of phenol, 150-180 parts of formaldehyde, 15-30 parts of 30% liquid caustic soda, 1-10 parts of dodecyl diphenyl ether sodium disulfonate and 180-260 parts of water. The waste petroleum phenolic residue modified sulfamate high-efficiency water reducing agent disclosed by the invention is low in production cost, the slump loss and the bleeding phenomenon of concrete can be remarkably reduced, the slump resistance can be improved, the peaceability can be improved, a remarkable concrete reinforcing effect can be achieved, and the social and economic benefits are remarkable.