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 belongs to the technical field of concrete additives in building materials. The high water reduction high collapse protection type polycarboxylate high-performance water reducer mainly comprises the following monomer components: unsaturated methyl vinyl polyoxyethylene ether (A), a chain transfer agent (B), a mixture (C) of one or more of unsaturated acid and unsaturated acid derivatives, an oxidant (D) and a reducing agent (E), wherein the molar ratio A: B: C: D: E of the monomers is 1:0.01-0.5:2-8:0.08-0.5:0.02-0.3. The high water reduction high collapse protection type polycarboxylate high-performance water reducer is prepared by regulating the polymer mass concentration to between 20 and 40 percent by using water, and polymerizing a redox initiator system at normal temperature. The water reducer has the advantages of low doping amount, high water reducing ratio, excellent slump retaining capacity, and high cement adaptability, and the technology has the advantages of no need of extra heat source, implementation at normal temperature, low equipment investment, low cost and suitability for large area popularization and application.

The invention discloses an amphiplilic high-performance polycarboxylate water reducer which has a structure as shown in the formula, wherein n is a natural number between 10-60, and x, y and z are positive integers; the invention further discloses a preparation method of the amphiplilic high-performance polycarboxylate water reducer, and the preparation method comprises the steps of preparing a cationic active organic monomer and preparing the amphiplilic high-performance polycarboxylate water reducer. The amphiplilic high-performance polycarboxylate water reducer provided by the invention is domestic in synthetic raw materials, safe in synthetic process, mild in reaction condition and free of environmental pollution; besides, when used in concrete, the obtained product has the characteristics of low dosage, high dispersion, high slump loss resistance, high water reduction, high early compressive strength and the like.

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 relates to a preparation method of a concrete slushing agent, in particular to a preparation method of a phenolic ether polycarboxylate concrete slushing agent. The preparation method comprises the following steps of: polymerizing a raw material A with high copolymerization activity and ethylene oxide and / or epoxypropane under base catalysis ro obtain polyether macromonomer, and introducing the synthesized polyether macromonomer into the main chain of polycarboxylic acid in the manner of free radical polymerization to finally obtain the phenolic ether polycarboxylate concrete slushing agent of which the main chain is provided with the benzene ring. The slushing agent has the advantages of high slushing, high collapse perversion and good concrete adaptability.

The invention discloses a novel polycarboxylate water reducer and a preparation method thereof. The novel polycarboxylate water reducer disclosed by the invention is prepared by carrying out a free radical copolymerization reaction on an unsaturated acid monomer and a comb polyether monomer according to a molar ratio of 1:(3-8). The comb polyether monomer is prepared by fully mixing an unsaturatedhalogen compound, a catalyst, a ligand and an OEGMA monomer according to a molar ratio of 1:1:(1-2):(5-25). The preparation method comprises the following steps: adding an oxidizing agent and water into the comb polyether monomer, uniformly mixing tof form a base liquid; dropwise adding a drop liquid comprising an unsaturated acid monomer, a reducing agent, a chain transfer agent and water to carry out a polymerization reaction, thereby obtaining the novel polycarboxylate water reducer. The novel polycarboxylate water reducer disclosed by the invention has the advantages of being high in water reduction performance, high in slump loss resistance, resistant to clay and capable of reducing concrete viscosity. The novel polycarboxylate water reducer is produced by a one-pot process, the process is simple, no waste is produced, and the production process is green and environmentally friendly.

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 discloses a cross-linking type low-sensitivity polycarboxylate water reducing agent and a preparation method thereof. The structural formula of the polycarboxylate water reducing agent is as shown in the specification. The polycarboxylate water reducing agent is synthesized by copolymerization of 4-hydroxybutyl vinyl polyethenoxy ether, unsaturated acid, unsaturated phosphomonoester and unsaturated phosphodiester, and has high water-reducing rate, high slump loss resistance, mud resistance and low dosage sensibility under the synergetic effect of various groups.

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.