34results about How to "Good dispersion retention" patented technology

The invention discloses a plastic retaining type polyether assemblage carboxylic acid high-performance water reducing agent and a preparation method thereof, mainly being applicable to the field of building materials. The water reducing agent is obtained in the following method: with the action of initiating agent, copolymerizing unsaturated polyalkyl ether monomer (A), unsaturated monocarboxylic acid and derivative monomer thereof (B), unsaturated dicarboxylic acid and derivative monomer thereof (C) and unsaturated sulfonic acid or salt monomer (D) in water solution for 2-8h at 50-80 DEG C and then reducing temperature to 35-45 DEG C, using alkaline solution to neutralize the mixture to a pH value of 5-7, thus obtaining the water reducing agent. The synthesized water reducing agent of the invention features changeable molecular structure, high water reducing ratio, high dispersion property under low dosage and fine slumps-retaining property, good adaptability to concrete raw material; in addition concrete with the water reducing agent added enjoys good peaceability; with the one-step method synthesis technology employed, the preparation method has the advantages of simple operation, low energy consumption in production and freedom from pollution.

The object of the present invention is to provide a powder cerium-based abrasive which enables the preparation of a cerium-based abrasive slurry, in which the dispersed state of the abrasive particles is maintained for a long period of time, simply by blending it with a dispersion medium such as water and which makes easier the after-treatment of the abrasive slurry having been used. The cerium-based abrasive of this invention is a cerium-based abrasive including chlorine-containing compounds in which chlorine (element) is contained in amounts, in terms of total mass, equivalent to 0.05% to 5.0% of the mass of the total rare earth oxide contained therein. An abrasive slurry including the abrasive of this invention as a solid content is superior in dispersion maintaining properties of its abrasive particles. Accordingly, an abrasive slurry having a stable concentration of the solid content can be supplied continuously. Further, the abrasive requires no dispersant for maintaining its dispersed state, and hence separation treatment for a dispersant is unnecessary after the abrasive has been used. Thus, the abrasive according to the present invention makes simpler the after-treatment of the abrasive slurry after use.

The invention discloses a synthetic method for maleic polycarboxylic water reducer. The method is characterized in that: maleic anhydride (MA) and polyethylene glycol (PEG) / methoxy polyethylene glycol (MPEG) are used as the raw materials to synthesize polyethylene glycol maleate monoester (PEG-MA) / methoxy polyethylene glycol maleate monoester (MPEG-MA); and PEG-MA / MPEG-MA, AA / AANa and methoxy polyethylene glycol metacrylic acid ester (MPEG-MAA) are used as the raw materials to synthesize a maleic polycarboxylic water reducer containing carboxyl and a polyoxyethylene (PEO) side chain structure. According to the invention, the molecular structure of the polycarboxylic water reducer introduces carboxyl and PEO with a long side chain, which enables electrostatic repulsion among cement particles to be increased, dispersibility, i.e. retentivity of dispersion of cement to be improved, and steric hindrance among cement particles is realized, thereby realizing low slump loss. Simultaneously, the preparation method provided in the invention has the advantages of a simple process, mild reaction and wide sources of cheap raw materials.

The invention relates to a preparation method of graphene bonding modified silica fume. The method comprises steps as follows: 1) carboxylated graphene and a silane coupling agent KH550 solution have a reaction under the action of a catalyst, so that coupling modified graphene is obtained; 2) then the coupling modified graphene reacts with the silane coupling agent KH550 solution, and KH550 sol containing the coupling modified graphene is obtained; 3) the KH550 sol reacts with surface hydroxylation modified silica fume, and the graphene bonding modified silica fume can be prepared. The method has the benefits as follows: (1) the strength of cement based composite materials can be significantly enhanced, so that the silica fume has the higher dispersity as well as excellent electrical properties; (2) concrete can have the higher flowing property; (3) the strength (especially the bending strength) of cement concrete can be enhanced, and the toughness of the cement concrete is improved; (4) the application range of the concrete is wider.

The invention discloses a mixed alcohol polyoxyethylene ether water reducing agent macromonomer, and a preparation method and application thereof. The preparation process of the mixed alcohol polyoxyethylene ether water reducing agent macromonomer comprises the following steps of in the nitrogen gas atmosphere, performing mixing and stirring reaction on potassium hydroxide, sodium series catalysts, methallyl alcohol, allylic alcohol and ethylene oxide; performing synthesis to obtain mixed alcohol polyoxyethylene ether intermediates; performing reaction on the mixed alcohol polyoxyethylene ether intermediates and ethylene oxide in the nitrogen gas atmosphere; performing synthesis to obtain a final product mixed alcohol polyoxyethylene ether which is a macromonomer used for preparing a polycarboxylic acid water reducing agent. The mixed alcohol polyoxyethylene ether synthesized and obtained by the method simultaneously have the basic molecular framework structure of allylic alcohol and methallyl alcohol; when the mixed alcohol polyoxyethylene ether product is used for preparing the polycarboxylic acid water reducing agent, and the polycarboxylic acid water reducing agent is applied to cement, the water reducing performance can be maintained; meanwhile, good dispersion maintaining performance can be realized.

The invention discloses an anti-crack high slump loss resistance concrete polycarboxylate superplasticizer, being prepared from the following components in parts by weight: 25-35 parts of isopentenol polyethylene glycol monomethyl ether macromonomer, 40-50 parts of isopentenol polyethylene glycol monomethyl ether macromonomer, 3.5-4.5 parts of 2-propylene acyl amino-2-methyl-1-propane sulfonic acid, 4-5 parts of allyl polyoxyethylene ether, 3-5 parts of maleic anhydride, 2.5-3.5 parts of dimethyl fumarate, 3-5 parts of hydroxyalkyl acrylate, 4-8 parts of sodium hypophosphite, 0.5-1.5 parts of tartaric acid, 80-83 parts of water and 15-21 parts of sodium hydroxide. The anti-crack high slump loss resistance concrete polycarboxylate superplasticizer has good adaptability to cement, is less in amount of admixture and high in water-reducing rate, is capable of reducing water cement ratio and improving fluidity, is low in slump loss and remarkable in early strengthening effect, and is capable of improving the compactness of concrete, saving cement, improving the working performances of the concrete and improving the durability of the concrete.

The invention provides a polycarboxylic concrete water reducer which is a copolymer formed by copolymerizing monosomic A, B, C, D and E, wherein the weight-average molecular weight of the copolymer is 20000 to 50000; A is allyl polyglycol ether or methyl-allyl-polyglycol ether, of which the weight-average molecular weight is 800 to 4000; B is maleic anhydride; C is acrylic acid or methacrylic acid; D is 2-acrylamide; and E is N, N'-methylene-bis-acrylamide. Taken by molarity part, when A is 1.0, B is 0.4 to 2.0, C is 1.0 to 3.0, D is 0.1 to 1.0, and the ratio between A+B+C+D and E is 100 to (0.5 to 1.8). Compared with the prior art, the invention has the advantages that under the condition of low dosage of the polycarboxylic concrete water reducer, the dispersivity and the retentivity of concrete are also kept favorable, and the gradual loss control of cement paste fluidity of the polycarboxylic concrete water reducer is obviously superior to a general polycarboxylic water reducer.

The invention discloses an anti-cracking shrinkage-reducing polycarboxylic acid water reducer and a preparation method thereof. The weight-average molecular weight (Mw) of the anti-cracking shrinkage-reducing polycarboxylic acid water reducer is 10,000-100,000, and the structural formula of the anti-cracking shrinkage-reducing polycarboxylic acid water reducer is shown in the specification. The preparation method comprises the following steps: (1) introducing an unsaturated double-bond structure on the structure by taking gallic acid as a raw material to prepare a gallic acid derivative unsaturated small monomer, carrying out free radical copolymerization reaction on the water reducing agent prepolymer and carbonyl-containing unsaturated acid and derivative monomers thereof to obtain a water reducing agent prepolymer; (2) introducing a hydrophilic polyether side chain on the gallic acid derivative of the prepolymerization product to prepare the shrinkage-reducing polycarboxylic acid water reducer with excellent performance. The anti-cracking shrinkage-reducing type polycarboxylate superplasticizer prepared by the preparation method disclosed by the invention is good in stability and suitable for being stored under various extreme weather conditions; the dispersing effect in concrete is good, the shrinkage reducing effect is excellent, and cracking conditions caused by various types of shrinkage can be obviously controlled and retarded.

The invention discloses a high-performance reinforcing agent for a pile and a preparation method thereof. The reinforcing agent takes unsaturated acid, urea, TPEG (alkylene polyoxyethylene polyoxypropylene ether) and the like as major chemical synthesis raw materials. Amidation and copolymerization processes are performed under certain condition under the actions of a catalyst, an initiator, a chain transfer agent and the like, so that a high polymer with an amphiphathic structure is obtained. Hydrophilic hydroxyl, carboxyl, amide groups and sulfonic groups, a hydrophobic carbon chain and a polyoxyethylene polyoxypropylene ether long chain structure with a certain steric hindrance effect exist in the molecular structure of the reinforcing agent. The reinforcing agent is suitable for preparing concrete for prestressed high-performance concrete (PHC) pipe piles.

The invention provides a viscosity-reduction type polycarboxylate water reducer and a preparation method thereof, and relates to the technical field of concrete admixtures. Through the technical scheme, the water reducer is essentially formed by copolymerizing unsaturated polyoxyethylene glycol ether macromonomers, unsaturated acid monomers and modified monomers containing ester groups under the effect of a redox system and a chain transfer agent, wherein the modified monomers containing ester groups comprise esters of salicylic acid and maleic anhydride. The viscosity-reduction type polycarboxylate water reducer synthesized in the invention is simple in technology, low in cost and easy to operate, and has good dispersibility and dispersion retainability, so that the requirement of long-distance transportation is met; when the water reducer is applied to high-performance concrete, the viscosity reduction effect is obvious, the viscosity of high grade concrete can be reduced effectively, the slump retainability of concrete is improved, the rheological property and working performance of concrete are improved, and the water reducer is particularly applicable for preparing high-strength, superhigh-strength and self-compact concrete. Moreover, the water reducer has broad adaptability for different cements and aggregates.

The invention relates to a method for preparing a slump loss-resistant type polycarboxylic acid water reducer by silanizing a terminal group of amino polyether. The method provided by the invention takes an amino polyether type compound, a silane coupling agent, an unsaturated carboxylic acid type monomer and the like as main reaction raw materials and a polycarboxylic acid water reducer is prepared through firstly hydrolyzing, substituting, then carrying out condensation, and finally copolymerizing; the method comprises the following steps: firstly hydrolyzing by a halogenated silane coupling agent; then taking the silane coupling agent and the amino polyether type compound to be subjected to substitution reaction; carrying out the condensation on a substituted product and a vinyl silane coupling agent hydrolyzed product; taking a condensed product and unsaturated polyoxyethylene ether, a molecular weight regulator and the unsaturated carboxylic acid type monomer to be subjected to free-radical copolymerization reaction under the action of an initiator to prepare the polycarboxylic acid water reducer with a plurality of branched silane modified polyether side chains. The method provided by the invention has the advantages of simple and easy-to-control process, low cost, energy saving and high efficiency, environmental protection and no pollution; dual modification of the side chains of a main chain of a polycarboxylic acid molecule is successfully realized and more excellent water reduction and slump loss resistance performance, which is better than that of a common polycarboxylic acid water reducer, is represented.

The invention provides a retarder used in a refractory material, which is prepared by the following steps: weighing polyester polyol, silsesquioxane and diisocyanate according to the ratio, adding thepolyester polyol, the silsesquioxane and solvent N-methylpyrrolidone into a reaction container, fully stirring, heating, adding the diisocyanate, adding a catalyst, keeping the temperature and continuously stirring after the catalyst is added, and then keeping the temperature after heating to prepare a prepolymer of which the end group is -NCO; cooling, adding sodium hydrogen sulfite into the reaction container, continuously stirring, keeping the temperature, finally adding water into the reaction container, and continuously stirring, so as to obtain the retarder for the refractory material.The retarder can adjust the setting time of the refractory castable, avoids premature setting of the castable, has good operability, and can greatly reduce the construction energy consumption. Meanwhile, the retarder for the refractory material can also be used as a dispersing agent to improve the flowability of the refractory castable and reduce the consistency.

The invention discloses a preparation method for a polyphosphate water-reducing agent. The preparation method is characterized by comprising the following steps: subjecting isoamylenol polyoxyethylene ether and pyrophosphoric acid to a phosphate esterification reaction so as to obtain isoamylenol polyoxyethylene ether phosphate monomer; and then with ammonium persulfate as an initiator and mercaptopropionic acid as a conditioning agent, carrying out free radical homopolymerization in an aqueous solution so as to obtain the polyphosphate water-reducing agent. The preparation method is simple; a single, cheap and low-cost raw material is used in the method; and the obtained polyphosphate water-reducing agent is nonvolatile and basically nontoxic, and has good biodegradability, a water-reducing rate and slump loss resistance.

The invention discloses a plastic retaining type polyether assemblage carboxylic acid high-performance water reducing agent and a preparation method thereof, mainly being applicable to the field of building materials. The water reducing agent is obtained in the following method: with the action of initiating agent, copolymerizing unsaturated polyalkyl ether monomer (A), unsaturated monocarboxylicacid and derivative monomer thereof (B), unsaturated dicarboxylic acid and derivative monomer thereof (C) and unsaturated sulfonic acid or salt monomer (D) in water solution for 2-8h at 50-80 DEG C and then reducing temperature to 35-45 DEG C, using alkaline solution to neutralize the mixture to a pH value of 5-7, thus obtaining the water reducing agent. The synthesized water reducing agent of the invention features changeable molecular structure, high water reducing ratio, high dispersion property under low dosage and fine slumps-retaining property, good adaptability to concrete raw material; in addition concrete with the water reducing agent added enjoys good peaceability; with the one-step method synthesis technology employed, the preparation method has the advantages of simple operation, low energy consumption in production and freedom from pollution.

The invention discloses an enhanced polycarboxylate superplasticizer and a preparation method thereof. The enhanced polycarboxylate superplasticizer disclosed by the invention is prepared by copolymerizing an unsaturated reactive polyether and an unsaturated comonomer with a carboxylic acid group or anhydride under the condition of no water or no solvent and then carrying out acylation reaction onamino groups contained in a silane monomer with carboxyl or anhydride. According to the invention, the silicon element with the same components as cement is introduced into molecules of the polycarboxylate superplasticizer; replacing an anionic group with a silane group to serve as an adsorption group of the polymer is adopted, therefore, the electrical property of the molecules of the polycarboxylate superplasticizer is changed, the sensitivity of the polycarboxylate superplasticizer due to the electrical property of the surface of the material is reduced, the dispersion and dispersion retention properties of the polycarboxylate superplasticizer and the adaptability to the material are improved, and an obvious reinforcing effect is achieved on concrete.

The invention provides anti-collapse mud-resistant polycarboxylic acid and a preparation method thereof. The anti-collapse mud-resistant polycarboxylic acid is prepared from the following raw materialingredients in parts by weight: 250.0 to 300.0 parts of macromonomers, 5.0 to 10.0 parts of acrylic acid, 10.0 to 20.0 parts of hydroxypropyl acrylate, 7.5 to 15.0 parts of dimethyl diallyl ammoniumchloride, 1.0 to 1.5 parts of sodium hydrogen sulfite, 3.0 to 4.0 parts of mercaptopropionic acid, 4.0 to 7.0 parts of initiators, 400.0 to 500.0 parts of pure water, 10.0 to 20.0 parts of 30 percentsodium hydroxide, 10.0 to 20.0 parts of flue gas desulfurization gypsum, 5.0 to 10.0 parts of air entraining agents and 10.0 to 15.0 parts of water reducing agents. The anti-collapse mud-resistant polycarboxylic acid and the preparation method thereof have the beneficial effects that heating is not needed in a whole process; energy is saved; environment is protected; higher primary stage water reducing rate and better anti-collapse capability are realized; relatively strong cement particle dispersion maintaining capability is realized, so that concrete has the advantages of low doping quantity, high water reducing rate, good enhancing effect, strong durability and relatively good cement dispersibility; the setting time and gas content of the concrete are not influenced; the flowability andthe plasticity of the concrete can be improved; and the bleeding and separation of the concrete are reduced.

An amphiphilic comb-shaped superplasticizer is disclosed. In order to study the effect of hydrophobic long side chains on the dispersibility of comb superplasticizers, an amphiphilic comb-shaped poly(dodecyl methacrylate)-isoprenol polyoxyethylene ether-maleic anhydride terpolymer (APC) is prepared by an aqueous solution free radical copolymerization by use of ammonium persulfate as an initiator.Comb type. Three monomers are well copolymerized. The weight average relative molecular mass and the number average relative molecular mass of a sample are 50625 and 10173, respectively. The relativemolecular mass distribution index is 4.97. Through introduction of a hydrophobic alkyl ester long side chain, the comb copolymer is self-assembled in a cement pore solution to form micelles with a diameter of more than 100 nm. A TEM (transmission electron microscope) observes the micelles to find that the micelles are spherical and cemented together to form agglomerates, the hydrodynamic radius and the solvation layer thickness of the copolymer can be increased, and the dispersion properties of a water reducer can be reduced.

The invention provides a polycarboxylic concrete water reducer which is a copolymer formed by copolymerizing monosomic A, B, C, D and E, wherein the weight-average molecular weight of the copolymer is 20000 to 50000; A is allyl polyglycol ether or methyl-allyl-polyglycol ether, of which the weight-average molecular weight is 800 to 4000; B is maleic anhydride; C is acrylic acid or methacrylic acid; D is 2-acrylamide; and E is N, N'-methylene-bis-acrylamide. Taken by molarity part, when A is 1.0, B is 0.4 to 2.0, C is 1.0 to 3.0, D is 0.1 to 1.0, and the ratio between A+B+C+D and E is 100 to (0.5 to 1.8). Compared with the prior art, the invention has the advantages that under the condition of low dosage of the polycarboxylic concrete water reducer, the dispersivity and the retentivity of concrete are also kept favorable, and the gradual loss control of cement paste fluidity of the polycarboxylic concrete water reducer is obviously superior to a general polycarboxylic water reducer.

The invention discloses a method for preparing polycarboxylate water-reducer by optimizing microwave radiation by response surface method. It uses allyl alcohol polyoxyethylene ether and sodium methacrylene sulfonate as raw materials and mixes them uniformly with water. Heat to the reaction temperature, then add acrylic acid and ammonium persulfate at constant temperature to react for a period of time, use the response surface method to set the variable parameters of the reaction, cool down after the reaction, adjust the pH, and obtain the polycarboxylate superplasticizer. On the basis of single factor analysis, the present invention uses the response surface method to optimize the synthesis process of polycarboxylate water reducer, and obtains the process conditions that are more suitable for preparing polycarboxylate water reducer, aiming at the development and promotion of high-efficiency water reducer Provide a basis for scientific experiments.

The invention discloses a microcrystalline waterproofing agent for concrete and an application thereof, belonging to the field of concrete additives. In terms of parts by mass, it includes the following components: 1-5 parts of defoaming agent; 2-4 parts of modified silicon dioxide powder; 7-10 parts of waterproofing agent; 0.5-1.5 parts of water reducing agent. In the present invention, by adding a certain amount of defoamer to the microcrystalline waterproofing agent, microcapillary pores with relatively short length and small diameter are formed in the concrete, and at the same time, the surface of the modified silica powder particles has more hydrophobic Sexual groups further strengthen the defoaming and foam stabilizing effects, and reduce the volume of capillary pores that will be formed during the gas discharge process. The tension of the liquid on the surface of these micro pores can effectively prevent the liquid from entering the micro pores, thereby greatly enhancing the waterproof ability of concrete.

The invention discloses a method for preparing a maleic anhydride high-efficiency water reducer by optimizing microwave radiation by response surface method. It uses allyl polyoxyethylene ether and sodium methacrylate sodium sulfonate as raw materials, stirs and mixes them evenly with water. Heating to the reaction temperature under certain conditions, then adding maleic anhydride and ammonium persulfate at a constant temperature to react for a period of time, using the response surface method to set the variable parameters of the reaction, cooling after the reaction, and adjusting the pH to obtain a maleic anhydride-based high-efficiency water reducer . On the basis of single factor analysis, the present invention uses response surface method to optimize the synthesis process of maleic anhydride superplasticizers, and draws the process conditions that are more suitable for preparing maleic anhydride superplasticizers. The development and popularization provide scientific test basis.

The application relates to the field of concrete admixtures, and specifically discloses a slump-preserving concrete admixture, a preparation method thereof, and a super-slump-preserving concrete. A super-slump concrete admixture, comprising the following raw materials in parts by weight: 10-30 parts of amino-terminated methoxy polyethylene glycol, 15-10 parts of methoxy polyethylene glycol, and 50-80 parts of polymethacrylic acid , 20-40 parts of aliphatic hydroxy acid, its preparation method is: take amino-terminated methoxy polyethylene glycol, methoxy polyethylene glycol, polymethacrylic acid and aliphatic hydroxy acid by weighing formula quantity, stir together mixed, heated to 100-110°C for 2-3 hours, and dried to obtain the ultra-slump concrete admixture, adding the super-slump concrete admixture of the present application to the concrete to obtain commercial concrete, which is transported in a high-temperature environment It still has good slump retention performance.

The invention relates to the technical field of concrete admixtures, particularly to a cross-linked air-entraining type water reducing agent and a preparation method thereof. The water reducing agent comprises a cross-linked air-entraining type polymer, which comprises a polymer or a copolymer obtained from monomers, wherein the monomers comprise air-entraining type monomers and vinyl ether macromonomers. By adopting the cross-linked air-entraining type water reducing agent provided by the invention, bubbles can be introduced into concrete, the bubbles are stabilized, the dispersion retentivity of the concrete is improved, and a micro-cross-linked structure is introduced, so that a polymer structure is more stretched, a hydration film is thicker, greater steric hindrance effect, better dispersibility, dispersion retentivity and better intercalation resistance can be achieved, and a wide market application prospect is achieved.

The invention discloses an anti-cracking and shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. Its weight-average molecular weight (M w ) is 10000~100000, and the structural formula is that the preparation method of the present invention is: (1) use gallic acid as raw material to introduce unsaturated double bond structure on the structure to prepare gallic acid derivative unsaturated small monomer, and then combine it with carbonyl-containing unsaturated monomer Saturated acid and its derivative monomers are subjected to free radical copolymerization to obtain a water reducer prepolymerization product; (2) Introduce a hydrophilic polyether side chain on the gallic acid derivative of the prepolymerization product to prepare a shrinkage reduction type with excellent performance Polycarboxylate superplasticizer. The anti-cracking and shrinkage-reducing polycarboxylate water-reducer prepared by the present invention has good stability and is suitable for storage under various extreme weather conditions; it has good dispersion effect in concrete, excellent shrinkage reduction effect, and is effective against cracking caused by various types of shrinkage. Very noticeable control and mitigation.

The invention relates to the technical field of concrete admixtures, in particular to a cross-linked air-entraining water-reducing agent and a preparation method thereof, wherein the water-reducing agent comprises: a cross-linked air-entraining polymer, the air-entraining polymer Contains polymers or copolymers derived from monomers including air-entraining monomers, vinyl ether macromonomers. By using the cross-linked air-entraining water reducing agent provided by the present invention, air bubbles can be introduced into the concrete and the air bubbles can be stabilized and the dispersion retention of the concrete can be improved. Not only that, the introduction of the micro-cross-linked structure makes the polymer structure more stretched and the hydration film thicker. , has greater steric hindrance and better dispersibility, dispersion retention and better anti-intercalation effect, and has broad market application prospects.

The invention discloses a ternary block macromonomer graft copolymerization high-property polycarboxylic acid water-reducing agent and a preparation method thereof. The preparation method comprises the following steps: dissolving a ternary block polyether macromonomer, a non-block polyether macromonomer and maleic anhydride into deionized water; then continuously stirring at a certain temperature, and respectively adding an initiating agent, a reducing agent and a chain transfer agent; and after the reaction is completed, regulating pH to neutrality to obtain the ternary copolymerization high-property polycarboxylic acid water-reducing agent. The water-reducing agent disclosed by the invention can enable the concrete to achieve higher flowing property under the condition of lower water cement ratio; because epoxy propane contained in the ternary block polyether macromonomer has an agglomeration effect and has high space steric effect, the synthesized polycarboxylic acid system water-reducing agent has more excellent dispersing retentivity, the water-reducing agent has lower air content when being used for the concrete, and the water-reducing agent is a multifunctional and high-adaptability high-property water-reducing agent which integrates water reduction, slump loss resistance and low air entrainment into a whole.