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Method for preparing nanoparticle water reducing agent

A nano-particle and water-reducing agent technology is applied in the field of preparation of nano-particle-type water-reducing agent, which can solve the problems that the mechanical properties and durability of cement concrete can be improved very little, and achieve the improvement of impermeability and resistance to ion penetration. performance, improved durability, improved flow properties

Inactive Publication Date: 2012-02-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the role of water reducing agent is only reflected in the improvement of the flow properties of cement concrete in the early stage, and the improvement of other later performances of cement concrete such as mechanical properties and durability is very small.

Method used

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  • Method for preparing nanoparticle water reducing agent
  • Method for preparing nanoparticle water reducing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 20 g of sodium propyl sulfate was dissolved in 250 ml of deionized water, and the temperature was raised to 60° C. to obtain a clear emulsifier solution. After mixing 30g of acrylic acid, 200g of styrene, 100g of butoxy-terminated polyethylene glycol allyl ether, and 2g of sodium methacrylate sulfonate, add dropwise to the emulsifier solution, and add 20g of dibenzoyl peroxide at the same time. , polymerized for 3 hours, after the end, the reaction was continued for 5 hours, the temperature was cooled, the residue was filtered off, and the pH value of the stock solution was adjusted to alkaline with NaOH to obtain a nanoparticle water reducer.

[0034] The particle size of the tested nanoparticle water reducing agent is 180nm, and the dispersion index is 0.134.

Embodiment 2

[0036] 25 g of sodium fatty alcohol sulfate and 25 g of sodium fatty alcohol polyoxyethylene ether sulfate were dissolved in 50 ml of deionized water, and the temperature was raised to 80° C. to obtain a clear emulsifier solution. After mixing 10g methacrylic acid, 50g styrene, 20g methoxy-terminated polyethylene glycol allyl ether, and 30g sodium methacrylate sulfonate, add dropwise to the emulsifier solution, and simultaneously add 40g potassium persulfate, The polymerization was carried out for 2 hours, after the end, the reaction was continued for 7 hours, the temperature was cooled, the residue was filtered off, and the pH value of the stock solution was adjusted to alkaline with NaOH to obtain a nanoparticle water-reducing agent.

[0037]The particle size of the tested nanoparticle water reducing agent is 80 nm, and the dispersion index is 0.04.

Embodiment 3

[0039] 90 g of lauramidopropyl betaine was dissolved in 600 ml of deionized water, and the temperature was raised to 55° C. to obtain a clear emulsifier solution. 2 g of sodium ammonium acrylate, 600 g of styrene, 300 g of butoxy-terminated polyethylene glycol methallyl ether, 300 g of propoxy-terminated polyethylene glycol allyl ether, 50 g of methacrylic acid sulfonic acid, 0.05 g After mixing g 3-mercaptoethanesulfonic acid, add dropwise to the emulsifier solution, add 80g azobisisobutyronitrile simultaneously, polymerize for 4 hours, after the end, continue the reaction for 12 hours, cool down and cool, filter out the residue and adjust with NaOH The pH value of the original solution is alkaline to obtain a nano-particle type water reducing agent.

[0040] The particle size of the tested nanoparticle water reducing agent is 210nm, and the dispersion index is 0.092.

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Abstract

The invention discloses a method for preparing a nanoparticle water reducing agent, which belongs to the technical field of the preparation of building material admixtures. The water reducing agent at a certain doping amount can achieve the dispersing and water reduction effects at the early stage of cement paste; meanwhile, the water reducing agent has the functions of room-temperature film formation and emulsion modification, so the comprehensive performance of cement concrete such as late-stage waterproofness, compactness, chloride ion permeation resistance, mechanical properties, durability and the like can be greatly improved. The nanoparticle water reducing agent can be widely applied to the fields of railways, bridges, tunnels, dams, offshore engineering, remedial works and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of building material admixtures, and particularly relates to a preparation method of a nano-particle type water-reducing agent. Background technique [0002] Concrete is the most widely used building material at present. Concrete admixture is the sixth component in concrete besides cement, sand, stone, water and mineral admixtures. It plays a very important role in the application of high performance concrete. , In the development process of concrete technology, the invention and application of superplasticizer is recognized as the third technological leap in the field of concrete technology after reinforced concrete and prestressed reinforced concrete technology. As a variety of admixtures, high-efficiency water-reducing agent has the largest amount in it, and its mixing amount is not more than 5% of the cement quality. It mainly plays three different roles: (1) Improve the pourability of con...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F212/08C08F220/06C08F220/38C08F2/38C08F2/24C04B24/16C04B103/30
Inventor 孔祥明吴纯超张珍林
Owner TSINGHUA UNIV
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