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Polycarboxylate-type water reducing agent suitable for mud-containing aggregates and preparation method therefor

A technology of polycarboxylate-based water reducer, which is applied in the field of preparation of polycarboxylate-based water-reducer and polycarboxylate-based water-reducer. To achieve the effect of enhancing steric hindrance, improving water reducing rate and simple process

Active Publication Date: 2014-03-19
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this polycarboxylate water reducer when the aggregate mud content is high can avoid the adverse effect of the aggregate mud content on the polycarboxylate water reducer in ready-mixed concrete, without increasing the polycarboxylate water reducer. Solve the problems of insufficient water reduction, large slump loss, and low strength of concrete under the premise of the amount of water reducing agent

Method used

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  • Polycarboxylate-type water reducing agent suitable for mud-containing aggregates and preparation method therefor
  • Polycarboxylate-type water reducing agent suitable for mud-containing aggregates and preparation method therefor
  • Polycarboxylate-type water reducing agent suitable for mud-containing aggregates and preparation method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Step 1, the preparation of phosphonocarboxylic acid copolymer: 206 kilograms of acrylic acid and 95 kilograms of AMPS and 150 kilograms of water are made into dripping solution A, and 25 kilograms of sodium persulfate and 150 kilograms of water are made into dropping solution B for stand-by; Put 112 kg of maleic anhydride, 62 kg of sodium hypophosphite and 200 kg of water into a reaction kettle with a stirring paddle and a condensing reflux device, raise the temperature to 70°C, and add dropwise solution A and dropwise solution B at the same time, and finish dropping within 2 hours After dripping, the temperature was raised to 90°C and kept for 3 hours to obtain a phosphonocarboxylic acid copolymer PPC-1 with a solid content of 50%;

[0029] Step 2. Preparation of polycarboxylate water reducer suitable for mud-containing aggregates: 27.8 kg of phosphonocarboxylic acid copolymer PPC-1, 425.7 kg of isopentenol polyoxyethylene ether (average addition of ethylene oxide The ...

Embodiment 2

[0031] Step 1, the preparation of phosphonocarboxylic acid copolymer: 156 kilograms of acrylic acid, 113 kilograms of hydroxypropyl acrylate and 63 kilograms of AMPS and 150 kilograms of water are made into drop solution A, and 33 kilograms of sodium persulfate and 150 kilograms of water are made into drops Add liquid B for use; put 85 kg of fumaric anhydride, 50 kg of phosphorous acid and 200 kg of water into a reaction kettle with a stirring paddle and a condensing reflux device, raise the temperature to 70°C, and simultaneously add dropwise liquid A and dropwise liquid B, after 2 hours of dripping, the temperature was raised to 90° C. and kept for 3 hours after the dripping, to obtain a phosphonocarboxylic acid copolymer PPC-2, with a solid content of 50%;

[0032] Step 2. Preparation of polycarboxylate water reducer suitable for mud-containing aggregates: 32.1 kg of phosphonocarboxylic acid copolymer PPC-2, 416.6 kg of isopentenol polyoxyethylene ether (average addition of ...

Embodiment 3

[0034] Step 1, the preparation of phosphonocarboxylic acid copolymer: 190 kilograms of hydroxyethyl acrylate and 51 kilograms of AMPS and 150 kilograms of water are made into dripping solution A, 19 kilograms of ammonium persulfate and 150 kilograms of water are made into dropping solution B to be prepared Use; put 160 kg of fumaric anhydride, 80 kg of sodium hypophosphite and 200 kg of water into a reactor with a stirring paddle and a condensing reflux device, raise the temperature to 70°C, and simultaneously add dropwise liquid A and dropwise liquid B, 2 After hours of dripping, the temperature was raised to 90° C. and incubated for 3 hours to obtain a phosphonocarboxylic acid copolymer PPC-3 with a solid content of 50%;

[0035] Step 2. Preparation of polycarboxylate water reducer suitable for mud-containing aggregates: 36 kg of phosphonocarboxylic acid copolymer PPC-3, 402.5 kg of isopentenol polyoxyethylene ether (average addition of ethylene oxide The number of moles is ...

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Abstract

The invention discloses a preparation method for a polycarboxylate-type water reducing agent suitable for mud-containing aggregates and belongs to the water reducing agent field. First, nonsaturated monocarboxylic acid and derivatives thereof, and / or nonsaturated dicarboxylic acid and derivatives thereof, phosphorus-containing monomers, and 2-acrylamide-2-methyl propanesulfonic acid (AMPS) are subjected to copolymerization under action of initiators and a kind of phosphono carboxylic acid copolymers are obtained; then the obtained phosphono carboxylic acid copolymers, isoamyl enol polyethenoxy ether, tetrabutyl ammonium fluoride, nonsaturated monocarboxylic acid and derivatives thereof are subjected to free radical copolymerization under action of initiators and chain transferring agents and the polycarboxylate-type water reducing agent is obtained. The adsorption of high valent metal ions to the polycarboxylate-type water reducing agent can be reduced, the adverse influences of the mud content of aggregates in concrete to the polycarboxylate-type water reducing agent can be avoided, and the problems of insufficient water reducing of concrete, low intensity and the like can be solved without raising mixing amount of the polycarboxylate-type water reducing agent.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular relates to a polycarboxylate water reducer suitable for mud-containing aggregates, and in particular to a preparation method of the polycarboxylate water reducer. Background technique [0002] Polycarboxylate water reducer is more and more widely used in concrete engineering because of its excellent properties such as high water reducing rate, high slump retention, high reinforcement and high durability. However, a large number of engineering examples and studies have shown that compared with naphthalene-based, melamine-based and sulfamic acid-based water-reducers, polycarboxylate-based water-reducers are more sensitive to the clay content of aggregates, mainly manifested as polycarbonate-based water-reducers. The water-reducing and dispersing ability of the carboxylic acid-based water-reducing agent is severely reduced, and the slump-preserving eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/06C08F220/06C08F222/06C08F220/58C08F220/28C08F222/04C08F222/02C08F220/56C08F220/14C08F8/40C04B24/26C04B103/30
Inventor 陈国新祝烨然王冬刘兴荣蔡明杜志芹付丹华黄国泓沈燕平徐唯唯杨日
Owner NANJING RUIDI HIGH TECH
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