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 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 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 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.

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.