30results about How to "Gao Baotan" patented technology

The invention belongs to the technical field of methods for preparing polycarboxylic acid water reducers. A method for preparing a polycarboxylic acid water reducer comprises the following: a step 1 of esterification, in which a poly(ethylene glycol methyl ether)acrylate macromonomer is synthesized by using methoxy polyethylene glycol and acrylic acid in a molar ratio of 1:1.1 to 1:1.5 at 100 to 120 DEG C, water is separated out in a reaction process, and the molecular weight of the macromonomer is 1,250 to 3,000; and a step 2 of polymerization, in which aqueous solution of the macromonomer is prepared, an unsaturated monomer and a catalyst A are added in turn at 40 to 50 DEG C, the temperature is kept constant at 28 to 40 DEG C, aqueous solution of anhydrous sodium hydrogensulfite or vitamin c is dripped, the concentration of a solid content is kept between 35 to 45 percent by adjusting water content, stirring is stopped, and the solution is allowed to stand for 1 to 1.5 hours, the pH value is kept between 6 and 8 by alkaline reagent after the reaction is finished, and the catalyst A is peroxyacetic acid or potassium peroxydisulfate. The invention has the advantages of low cost, simple process and high product performance.

The invention relates to an anticorrosive composite polycarboxylate superplasticizer with high slump loss resistance, and a preparation method and application thereof. The composite polycarboxylate superplasticizer comprises, by mass, 40 to 55% of mother liquor of a polycarboxylate superplasticizer, 4 to 7% of sodium gluconate, 0.15 to 0.3% of an air entraining agent, 0.1 to 0.25% of an antifoaming agent, 0.05 to 0.2% of an emulsifying agent and 0.1 to 0.3% of an anticorrosive bactericide, with the balance being water, wherein the mass percents of every component sum to 100%. The composite polycarboxylate superplasticizer is prepared by placing the mother liquor of the polycarboxylate superplasticizer, sodium gluconate, the air entraining agent, the antifoaming agent, the anticorrosive bactericide and the water in a container together according to the above-mentioned mass percents under the conditions of normal temperature and normal pressure and carrying out uniform mixing under stirring. In use, the composite polycarboxylate superplasticizer is added into a concrete cementing material according to a mass ratio of the composite polycarboxylate superplasticizer to the concrete cementing material of 0.1-0.15: 100. Compared with the prior art, the composite polycarboxylate superplasticizer provided by the invention has the advantages of convenience in usage, stable performance, no phenomena of mildew, smelliness and layering due to long-term storage, capacity of introducing small bubbles when used in fresh mixed concrete, and excellent water-reducing and slump-retaining performances.

The invention provides a preparation method and application of a mud-resistant polycarboxylate superplasticizer. The mud-resistant polycarboxylate superplasticizer has the advantages of being low in mixing amount, high in water-reducing rate, long in slump resisting time and high in mud resistance when serving as a cement dispersing agent. The synthesis process is simple, the raw material utilization rate is high, a solvent is convenient to recycle, and production cost is low. According to the preparation method of the mud-resistant polycarboxylate superplasticizer, the mud-resistant polycarboxylate superplasticizer is obtained through the free radical polymerization reaction of specific unsaturated acid monomers, specific unsaturated polyether macromonomers and poly(N-vinyl pyrrolidone) chain containing PVP macromonomers, and the molar weight of the unsaturated polyether macromonomers is 50% to 100% that of the PVP macromonomers.

The invention discloses a crosslinking-type low-sensitivity ester-ether copolymerized polycarboxylate superplasticizer and a preparation method thereof. The crosslinking-type low-sensitivity ester-ether copolymerized polycarboxylate superplasticizer has the number-average molecular weight of 10000-100000 and has a structural formula as shown in the specification. Under the synergistic effect of various groups, the polycarboxylate superplasticizer formed by copolymerization of 4-hydroxybutyl-vinyl polyoxyethylene ether, unsaturated acid, unsaturated phosphomonoester and unsaturated phosphodiester has the advantages of high water-reducing rate, high slump loss resistance, high peaceability, mud-resistant property and low dosage sensibility.

The invention provides a high-slump-resistance polycarboxylate water reducer. The high-slump-resistance polycarboxylate water reducer is composed of, by weight percentage, 10-25% of polycarboxylate slump-resistant mother liquor, 28-35% of polycarboxylate water reducing mother liquor, 4% of setting retarding components and water as balance. By adding in hydrophobic slow release ester groups, the high-slump-resistance polycarboxylate water reducer can avoid being adsorbed by cement particles during the early stage of cement hydration and meanwhile can be slowly released inside alkaline solutioninto water reducer molecules with water reducing effects to achieve water-reduced dispersion; the release speed can be adjusted according to requirements on environment, alkalinity and construction and by changing the number of slow release groups and the molar mass ratio of acid esters. By compounding the polycarboxylate slump-resistant mother liquor and the polycarboxylate water reducing motherliquor, the high-slump-resistance polycarboxylate water reducer is low in mixing amount and high in water-reducing and slump-resistant performance; the slump-resistant time can be flexibly adjusted according to the requirements on construction concrete transportation distance and time, the concrete slump-resistant time can be prolonged by 1-4 hours, so that high cement adaptability can be achieved.

The amino sulfonic acid water reducing agent with very low alkali content is produced through: 1. mixing amino aryl sulfonating agent, phenol monomer and water, regulating the pH value of the reaction system to 7-9.5, dropping condensing agent and heating to 50-100 deg.c to react for 0.5-2 hr; 2. regulating the pH value of the reaction system to 8-11, adding compound containing amino radical and reaction at 70-100 deg.c for 2-10 hr; and 3. regulating the pH value of the reaction system to 8.5-13, reaction at 85-100 deg.c for 0.5-3 hr, lowering the temperature, discharging and spray drying. The material consists of amino aryl sulfonating agent 10.5-32 wt%, phenol monomer 3.2-16 wt%, compound containing amino radical 0-10.5 wt% and water 17.5-65 wt%. The present invention has the feature of low total alkali amount of 0-1.0 wt%.

The invention discloses a ternary random copolymer and its preparation method. The ternary random copolymer is composed of the structural units of three monomers, i.e. X, Y and Z respectively shown in formula (1)-(3). The mole ratio of the three structural units, i.e. X:Y:Z is 1:2-5:0.4-1, and the copolymer has a weight average molecular weight of 10000-30000, with the meaning of each symbol in the formulas being shown in the specification. The copolymer is prepared from the three monomers through aqueous solution copolymerization in the presence of an initiator. The copolymer can be used as an early strength type concrete polycarboxylic water reducer. Because of the introduction of an amide structural unit, the water reducer can reduce the coagulation retarding effect of concrete and improve the early strength of concrete. In addition, as the copolymer has reasonable main and side chain density distribution, the water reducer also has the characteristics of high water reduction, high slump retaining and strong adaptability to cement.

The invention discloses a method for preparing an ether ester copolymer high-efficiency water reducer; methyl polyethenoxy ether, methyl methacrylate, polyethylene glycol and the like are taken as raw materials and go through ester condensation reaction, addition reaction and neutralization reaction to prepare the ether ester copolymer high-efficiency water reducer; and the preparation method is simple and the reaction conditions are easy to control. The weight percentages of the raw materials are as follows: 9 percent to 19 percent of methyl polyethenoxy ether, 45 percent to 60 percent of methyl methacrylate, 30 percent to 40 percent of polyethylene glycol; the technology of the preparation method is simple, the reaction is stable, the reaction condition is mild and the technological process is easy to control. The obtained ether ester copolymer high-efficiency water reducer has the advantages of high water reduction rate, good fluidity, high slump retaining ability, good plasticizing effect, low retardation, low shrinkage, high reinforcement and the like, thus meeting the technical requirements and construction requirements of modern high-performance concrete.

The invention discloses cracking resisting concrete. The cracking resisting concrete comprises the following components in parts by mass: 230-420 parts of cement, 60-120 parts of mineral powder, 40-70 parts of pulverized fuel ash, 175-190 parts of water, 580-765 parts of sand, 1,080-1,090 parts of gravel and 3.6-6.96 parts of a high-performance polycarboxylate admixture. The cracking resisting concrete disclosed by the invention has high ultimate strain capacity and high cracking resistance and is low in production cost, less cement is used, and less energy is consumed.

The invention provides a water reduction agent, belonging to the field of building material additives. The building water reduction agent comprises the following components in parts by weight: 4-20 parts of acetone, 10-15 parts of calcium lignosulphonate, 10-14 parts of urea, 4-7 parts of formaldehyde, 1-2 parts of sodium hydroxide, 2-5 parts of melaminen and 1-5 parts of phenol. According to the technical scheme, a preparation method of the water reduction agent comprises the following steps: mixing calcium lignosulphonate, urea and acetone, heating to be 55-65 DEG C, further feeding acetone, formaldehyde, sodium hydroxide, melaminen and phenol, and continuously stirring uniformly, thereby obtaining a product, wherein the products with different solid content can be prepared according to practical demands. The water reduction agent provided by the invention is wide in resource, simple in preparation method, free of toxicity or pollution and low in energy consumption.

The invention provides a making method for a low-cost concrete water-reducing agent. The making method comprises the following concrete contents: (1) cement mortar is allowed to form a flocculation structure under the action of molecular gravitation of cement particles, 10 to 30% of mixing water is allowed to be wrapped in the cement particles instead of participating in free flowing and exerting lubrication effect, so the fluidity of a concrete mixture is influenced, and raw material quality is stabilized at a constant level by using a waste material homogenizing and purifying apparatus developed under self-dependent innovation; (2) molecules of cement mortar aqua can directionally adhere on the surfaces of the cement particles, and the surfaces of the cement particles are allowed to carry same charges (usually negative charges) so as to form electrostatic repulsion effect, so the cement particles are dispersed, the flocculation structure is destroyed, and water wrapped in the cement particles is released and participated in flowing; and (3) the doping amount of the water-reducing agent is 0.4 to 2.0% of the gross weight of cementing materials, and a frequently-used doping amount is 0.4 to 1.2%. Concrete trial mix test should be carried out before usage of the water-reducing agent so as to determine an optimal doping amount.

The invention relates to a synthetic method of a side-chain adsorption type concrete super-plasticizer. By using an unsaturated monomer, an unsaturated initiator, a transition metal complex, a carboxylic small monomer and the like as main raw materials and through the method of auto-polymerization, hydrolysis and graft copolymerization, the side-chain adsorption type concrete super-plasticizer issynthesized. The synthetic method specifically comprises the following steps: the unsaturated monomer, which is used as a reactant, is subjected to atom transfer radical polymerization (ATRP) in an initiating system composed of the unsaturated initiator, transition metal halide and a ligand so as to obtain an unsaturated macromonomer; then, the macromonomer is subjected to hydrolysis to obtain ananionic macromonomer; and the anionic macromonomer and the carboxylic small monomer are subjected to radical graft copolymerization under the action of an initiator and a chain transfer agent to prepare the side-chain adsorption type concrete super-plasticizer. The synthetic method of the invention has controllable process and simple step, is convenient and efficient, and is energy-saving and environmentally-friendly. Through innovative design of the molecular structure, the side-chain adsorption type concrete super-plasticizer is synthesized, multiple excellent effects of water reduction andslump retaining and the effect of inhibiting side effect of clay are realized, and the types of the concrete super-plasticizer are enriched.

The invention discloses a low-temperature synthesis method of a multi-branched polycarboxylate superplasticizer. 1) Put a base material composed of unsaturated polyoxyethylene ether and water into a reaction kettle under a set temperature and stirring conditions; 2) After the base material is completely dissolved, put in the initiator, and add the pre-configured A and B materials dropwise at the same time; 3) The dropping time of A and B materials is controlled at 0.5‑1.5h, and the reaction is continued for 0.5 hours after the dropping ‑1.5h, dilute with water and neutralize with liquid caustic soda to pH 6‑8, and obtain that; wherein, the A material includes unsaturated carboxylic acid, unsaturated quaternary ammonium salt monomer and water; the B material includes a reducing agent , chain transfer agent and water. The synthesis method of polycarboxylate water-reducer provided by the present invention can synthesize multi-branched polycarboxylate water-reducer in one step within the range of 5-30°C, the selected initiator and reducing agent are low-temperature polymerization initiation system, and water As a solvent, the reaction process does not require external heat energy, the preparation process is simple, the reaction time is short, and it is environmentally friendly and economical.