103results about How to "Good anti-mud effect" patented technology

The invention provides a super-early-strength PCE (polycarboxylate ether) superplasticizer. The super-early-strength PCE superplasticizer is a compound shown in formula (I) and is synthesized with active macro-monomers used as raw materials, the space hindrance effect of the superplasticizer is further improved, and meanwhile, positive ions with good cement resistance are introduced in molecules, so that the superplasticizing rate, the cement resistance and the cement adaptability of the superplasticizer are increased. The superplasticizer has better tolerance and cannot have a continuous intercalation reaction with the cement. The positive ions of the super-early-strength PCE superplasticizer can inhibit expansion of the cement so as to reduce adsorption of the cement to an additive. The super-early-strength PCE superplasticizer can accelerate the hydration function of the cement and has the super-early-strength function. The super-early-strength PCE superplasticizer has super-early-strength and cement-resistant functions in common concrete.

The invention provides a preparation method and application of an anti-soil polymer. The prepared polymer is used as a dispersant for a hydraulic cementing agent and/or an aqueous dispersion for potential hydraulic cementing agent and has good anti-soil performance. The preparation method the anti-soil polymer comprises a step of subjecting polyether macromonomer A with a special structure, monomer B containing a phosphoric acid or phosphorous acid group, optional monomer D and aldehyde C to condensation polymerization so as to prepare the anti-soil polymer, wherein the monomer D is selected from the group consisting of phenol, aniline, p-/o-aminobezene solfonic acid, p-/o-hydroxybenzoic acid, p-/o-aminobenzoic acid, p-/o-hydroxyezene solfonic acid, p-/o-toluidine and p-/o-methylphenol, a mol ratio of the polyether macromonomer A to the monomer B to the monomer D is 1: (0.5-12): (0-8.0), and a mol ratio of the polyether macromonomer A to the monomer B and the monomer D is 1: (0.5-12.0).

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 preparation method of polycarboxylic acid nanoparticles. The polycarboxylic acid nanoparticles are formed through copolymerizing a hydrophilic monomer unsaturated acid, a hydrophilic monomer polyethylene glycol monomethyl ether methacrylate, a hydrophilic monomer unsaturated sulfonate and a hydrophobic monomer styrene or (meth)acrylate, and have a linear microstructure in water. The water reducer applied to concrete has the advantages of low proportion, high water reduction, long slump retaining time and excellent mud resistance; and the polycarboxylic acids particles solves the water reducing and slump retaining problems of concrete without a super water reducer or an extra sacrificing agent when the mud content of aggregates is high, so the water reducer has good economic benefit.

The invention provides a polycarboxylate superplasticizer with super high early strength. The polycarboxylate superplasticizer with super high early strength is a compound shown in the formula (I) and is synthesized with an active macromonomer as the raw material, cations are introduced into molecules while the steric hindrance effect of the superplasticizer is further improved, the cations have good soil resistance, so that the water-reducing rate of the superplasticizer is increased, and the soil resistance and the cement adaptability of the superplasticizer are improved. The polycarboxylate superplasticizer has better tolerance for soil and does not have an intercalation reaction with the soil. The cations of the polycarboxylate superplasticizer with super high early strength can inhibit soil expansion, so that admixture adsorption by the soil is reduced. The polycarboxylate superplasticizer with super high early strength can accelerate hydration of cement and has the super high early strength function. The polycarboxylate superplasticizer with super high early strength has super high early strength and soil resistance functions when applied to common concrete.

The invention discloses a mud resistant slow release type slump retaining agent containing a cyclodextrin side group and a preparation method thereof. The method synthesizes a mud resisting ester monomer by introducing a beta-cyclodextrin structural unit with appropriate steric hindrance and better water solubility to be subjected to an esterification reaction with fumaric acid. In alkaline environment of cement hydration, with the slow release of the mud resisting ester monomer, the beta-cyclodextrin introduced into the molecular structure of a water reducer can effectively weaken interpenetration between water reducer molecules and a clay layer because particles of the beta-cyclodextrin distribute in a range of 0.53-1.78 nm which is close to 1.44-1.86 nm that is the interlayer spacing ofbentonite, and so the polycarboxylic acid water reducer is good in mud resistance and slump retaining effect. Meanwhile, a phosphoric acid monomer is introduced into the molecular structure of the water reducer to further improve the mud resisting effect. The mud resistant slump retaining type polycarboxylic acid water reducer containing a cyclodextrin side group prepared by the method of the invention has the advantages of low dosage, long slump retaining time, strong mud resistance and the like, and is easy in synthesis process, safe, environmentally friendly and low in production cost.

The invention discloses a preparation method for a cationic side chain esterified-grafted highly-mud-resistant cement dispersing agent, and belongs to the field of dispersing agents. The preparation method comprises the following steps: performing free radical polymerization on an unsaturated carboxylic acid monomer serving as a reactant to obtain a polycarboxylic acid main chain under the action of an initiator and a chain transfer agent, performing free radical polymerization on an unsaturated cationic quaternary ammonium salt monomer serving as a reactant to obtain a hydroxyl-terminated cationic side chain under an oxidization-reduction initiation system formed by high-valence ceric salt and alcohol, and performing esterification-grafting reaction on the polycarboxylic acid main chain, the hydroxyl-terminated cationic side chain and a polyethylene glycol compound in the presence of a catalyst. According to the preparation method, a process is simple and easy to control, and the preparation method is low in cost, energy-saving, efficient, environment-friendly and free of pollution; a composite side chain structure is modified and synthesized by a molecular structure design, so that side chain steric hindrance effects are successfully achieved, cationic charge arrangement is successfully implemented, water reduction and slump retaining characteristics and clay side effect suppression capabilities higher than those of an ordinary polycarboxylic acid water reducing agent are achieved, and the dispersing agent has broad market prospect and great popularization and application potential.

The invention discloses an anti-mud type polycarboxylate water reducing agent and a preparation method thereof. The polycarboxylate water reducing agent is a copolymer formed by polymerizing unsaturated polyether macromonomers, unsaturated cationic functional monomers containing glucosyl groups and acrylic acid as raw materials in the presence of an initiator and a chain transfer agent through a free radical copolymerization reaction; the unsaturated polyether macromonomer is selected from any one or two of APEG, HPEG or TPEG; the initiator is selected from at least one of hydrogen peroxide, ammonium persulfate or potassium persulfate; the chain transfer agent is selected from at least one of mercaptopropionic acid, mercaptoacetic acid, sodium methallyl sulfonate or sodium allylsulfonate.The molecular side chain of the polycarboxylate water reducing agent designed and synthesized by the method not only contains a glucose group, but also contains a quaternary ammonium salt group; compared with an existing polycarboxylate water reducing agent, the polycarboxylate water reducing agent has higher adsorption capacity, a glucose structure can form a stable solvated water film on the surfaces of cement particles when being dissolved with cement, direct contact between the cement particles is prevented, hydration is hindered, and the slump loss resistance is improved.

Belonging to the field of dispersants, the invention provides a method for preparation of high mud resistant polycarboxylic acid dispersant by unsaturated halogenated hydrocarbon copolymerization and grafting with a cationic side chain. The method consists of: employing an unsaturated carboxylic acid monomer, an unsaturated halogenated hydrocarbon monomer, an unsaturated cationic quaternary ammonium salt monomer, a polyethylene glycol compound and the like as the raw materials, firstly conducting main chain copolymerization, then polymerizing the cationic side chain, performing functionalization, and finally carrying out etherification grafting so as to synthesize the excellent performance high mud resistant polycarboxylic acid dispersant material with unsaturated halogenated hydrocarbon copolymerized and grafted with cationic side chain, i.e. taking unsaturated carboxylic acid and unsaturated halogenated hydrocarbon as the reactants, conducting free radical polymerization to obtain a carboxylic acid-halogenated hydrocarbon copolymer main chain, using high valence cerium salt-alcohol to initiate polymerization of an unsaturated cationic quaternary ammonium salt monomer so as to obtain a hydroxyl terminated cationic side chain, then modifying the hydroxyl terminated cationic side chain and the polyethylene glycol compound to obtain a functionalized side chain, and carrying out etherification grafting of the functionalized side chain on the carboxylic acid-halogenated hydrocarbon copolymer main chain. The method provided by the invention realizes high water reduction, slump loss resistance, high clay resistance and other multiple effects.

The invention provides a mud resistant type water reducing agent and a preparation method therefor. The water reducing agent is prepared by copolymerizing a monomer A, a monomer B and a monomer C. The monomer B is unsaturated carboxylic acid monomers; the monomer C is unsaturated ester monomers. The structure of the monomer A is shown in the description: R1 is hydrogen or methyl; R2 is alkylidene with 1 to 5 carbon atoms; R3 is phenylene or benzylene; m and n are integers greater than zero, m is greater than or equal to 1 and less than or equal to 180, and n is greater than or equal to 1 and less than or equal to 3.

The invention relates to the field of concrete admixtures, and particularly discloses a mud-resistant polycarboxylate superplasticizer and a preparation method thereof. The mud-resistant polycarboxylate superplasticizer is prepared from the following raw materials in parts by weight through polymerization: 5 to 15 parts of acrylic acid, 10 to 25 parts of hydroxyethyl methylacrylate, 25 to 35 parts of 2-methyl-2-butenoic acid, 6 to 10 parts of sodium ethyl methacrylate sulfonate, 30 to 40 parts of allyl polyoxyethylene ether, 1 to 3 parts of an initiator, 1 to 2 parts of a chain transfer agent and 1 to 2 parts of a sacrificial agent. The preparation method of the mud-resistant polycarboxylate superplasticizer comprises the steps of solution preparation, heating reaction and acidity neutralization, and the prepared mud-resistant polycarboxylate superplasticizer has a good anti-mud effect and also has good dispersity and fluidity.

The invention discloses a solid anti-mud ultra-slow release polycarboxylate slump retention agent and a preparation method of the slump retention agent. The preparation method comprises the followingsteps of: (1) esterification: allowing methacrylic acid, saturated acid and 3-di(2-ethoxyl) amino-2-hydroxyl propanesulfonate to react to prepare an unsaturated esterification micromonomer by the action of a catalyst, (2) melt polymerization: adding unsaturated polyether and 4-hydroxybutyl vinyl polyoxyethylene ether into a reaction kettle for polymerization reaction in a molten state, and (3) solidification and slicing: after the reaction, performing vacuumizing through a mechanical pump to remove an organic solvent, and then performing slicing through a condensation slicer to form the whiteflaky solid polycarboxylate slump retention agent. The prepared slump retention agent has a good anti-mud effect and good slump retention ability for a long time.

The invention discloses a preparation method of a polymeric cement concrete additive. The method comprises the following steps of (1) preparation of furan ether polycondensate, (2) preparation of naphthalene sulfonate-modification furan ether polycondensate and (3) ion exchange between the naphthalene sulfonate-modification furan ether polycondensate and polyquaternium-10. The invention further discloses the polymeric cement concrete additive prepared through the preparation method of the polymeric cement concrete additive. The polymeric cement concrete additive has the advantages that functions are diverse, the strength, the flowability and the durability of a concrete material are improved and perfected, the impermeability effect is more significant, the doping amount is less, and the plastification performance is more excellent, and the performance of a reinforced concrete body is not affected negatively.

The invention discloses a preparation method of a mud-resistant viscosity-reduction type polycarboxylic acidplasticizer. The method comprises the following steps of (1) carrying out esterification reaction;(2) carrying out copolymerization reaction;(3) carrying out neutralization reaction. According to the preparation method provided by the invention, an unsaturated hydroxy ester and a compound Aare esterified, an unsaturated monomer with a phosphate group, an ester group and an amino group simultaneously is prepared and is then copolymerized and synthesized with excessive unsaturated hydroxyester in esterification, unsaturated carboxylic acid or unsaturated carboxylic acid anhydride and unsaturated silicon-containing small monomer, and a carboxy group, the phosphate group, the amino group, a silicon oxygen group, the ester group and a hydroxyl group are introduced into a molecular structure of the product, so that under a synergistic effect of various groups, the polycarboxylic acidplasticizer provided by the invention has higher water-reducing rate and a high slump loss resistant property.

The invention discloses a super early strength polycarboxylate water-reducer, and a preparation method thereof. The molecular structure of the super early strength polycarboxylate water-reducer contains cationic charges which are capable of promoting cement hydration reaction, and accelerating strength development of concrete, so that super early strength effect is achieved; and the super early strength polycarboxylate water-reducer possesses excellent cement particle dispersing capacity, high water-reducing rate, and excellent soil resistance because of an unique amphipathic structure and steric-hinerance effects.

The invention discloses a castor oil-based quaternary ammonium salt anti-mud agent and a preparation method thereof. The anti-mud agent is prepared from ricinoleic acid, N, N-dimethyl-1, 3-propane diamine and epoxy chloropropane; and the specific preparation method comprises the following steps: putting castor oil and a catalyst into a reaction container, introducing nitrogen, dropwise adding N, N-dimethyl-1, 3-propane diamine while stirring at room temperature, heating for reaction after dropwise adding is finished, and treating to obtain ricinoleic acid amide; and putting ricinoleic acid amide into a reaction container, introducing nitrogen, slowly dropwise adding epoxy chloropropane while stirring, controlling the temperature at 48 DEG C, heating to 50 DEG C after dropwise adding is finished, carrying out heat preservation reaction for 1 hour, removing excessive epoxy chloropropane with n-hexane, and carrying out vacuum drying to obtain a finished product. The anti-mud agent can quickly adsorb mud, reduce the mixing amount of polycarboxylate superplasticizers and ensure the performance of concrete, and the preparation method has the advantages of easily available synthesis raw materials, mild reaction conditions, biodegradable product, no influence on the environment, and low synthesis cost and post-treatment cost.