58results about How to "Good effect of entraining air" patented technology

The invention provides a composite concrete air-entraining agent, its preparation method and its application, characterized in that: the composite concrete air-entraining agent consists of sulfonate type gemini surfactant, betaine type amphoteric surfactant, alkane Alcohol amide type non-ionic surfactant and water; the solid content of the composite concrete air-entraining agent is 20±1%. The composite concrete air-entraining agent of the present invention has an excellent air-entraining effect in concrete, introduces a sufficient amount of 20-150 μm stable micro-bubbles, improves the workability of concrete (mortar), reduces bleeding rate and settlement, and While increasing the air content, it does not reduce the later strength of concrete.

The invention provides a preparation method of a polycarboxylic acid water reducing agent containing a phosphate group. The preparation method comprises the following steps: firstly, preparing a terminal alkenyl unsaturated phosphonic acid monomer; secondly, mixing acrylic acid, the unsaturated phosphonic acid monomer, a chain transferring agent and de-ionized water to prepare a mixed monomer solution; by taking an alkenyl polyoxyethylene ether macro-monomer solution as a base material, dropwise adding an initiator water solution and the mixed monomer solution respectively under a room-temperature polymerization condition; uniformly stirring, dropwise adding and reacting; and finally neutralizing with a sodium hydroxide solution to obtain the polycarboxylic acid water reducing agent. According to the water reducing agent, the terminal alkenyl unsaturated phosphonic acid monomer is introduced into a structure and primary adsorption is facilitated; the initial dispersity is improved, and hydration and agglomeration of cement are delayed; the slump retaining property is effectively improved and the sensitivity to concrete is reduced; and the stress resistance and adaptability on different aggregate are enhanced.

The invention provides a foam control agent and an air-entraining water reducing compounding agent and concrete prepared thereof. The foam control agent is mainly formed by compounding the following components by weight: 5-40% of an alkynol wetting agent E20, 40-70% of an alkynol wetting agent E40, 20-50% of an alkynol wetting agent E65, and the balance other accessories. The foam control agent has double technical effects of air entraining and foam control, can control the foam density and the foam size of a system, makes foams more uniform, eliminates big harmful foams, and makes the cement strength, stability and other properties improved.

The invention belongs to the field of concrete additives, and concretely relates to an air entrainment-controllable polycarboxylic water reducer used for purely machine-made sand concrete, and a preparation method thereof. The preparation method comprises the following steps: carrying out an esterification reaction on an alkylphenol polyoxyethylene monomer and an unsaturated carboxylic acid to generate an unsaturated carboxylic acid-alkylphenol polyoxyethylene esterification product monomer, carrying out an aqueous solution copolymerization reaction on the unsaturated carboxylic acid-alkylphenol polyoxyethylene esterification product monomer, an unsaturated polyether monomer and an unsaturated sulfonic acid monomer through an oxidation-reduction initiation system, and adding a proper amount of a molecular weight control agent to control the molecular weight in order to obtain the air entrainment-controllable polycarboxylic water reducer. The water reducer prepared in the invention has the advantages of high water reduction rate, good adaptability, small bubble diameters, stable sealing property and controllable air entrainment when applied to the purely machine-made sand concrete, and well solves the problems of difficult air entrainment, poor bubble stability and large concrete pumping loss of the purely machine-made sand concrete.