Organic phosphonate concrete plastic retaining agent and preparation method thereof

A phosphonate and concrete technology, which is applied in the field of concrete admixture, can solve the problems of high cost and complicated preparation method of phosphobutane tricarboxylic acid, and achieve the effects of low equipment requirements, favorable industrial production, and convenient operation

Active Publication Date: 2015-05-06
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compounding these two components has good plasticity retention for concrete, but the pr

Method used

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  • Organic phosphonate concrete plastic retaining agent and preparation method thereof
  • Organic phosphonate concrete plastic retaining agent and preparation method thereof
  • Organic phosphonate concrete plastic retaining agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 83.2 parts of maleic anhydride, 27.5 parts of styrene, 176.3 parts of AMPS, 64.8 parts of sodium hypophosphite and 332.9 parts of water in a four-necked flask equipped with a stirrer, dropping funnel, condenser tube and thermometer, and heat while stirring to 60°C~70°C; add 36.8 parts of sodium hydroxide to adjust the pH of the reaction system to 5~7; add 107.6 parts of hydroxypropyl acrylate and 3.8 parts of ammonium persulfate to 167.1 parts of water to form a mixed solution, and in 3 hours ~5h to finish dripping; after the dropwise addition, keep the constant temperature reaction for 2h~4h; stop heating, cool to about 40°C and discharge the material to obtain a yellow and transparent plastic-preserving agent solution LJH-1.

Embodiment 2

[0023] Add 76.3 parts of fumaric acid, 18.8 parts of styrene, 193.5 parts of AMPS, 77.6 parts of sodium hypophosphite and 344.7 parts of water into a four-necked flask equipped with a stirrer, dropping funnel, condenser tube and thermometer, and heat while stirring to 60°C-70°C; add 30.3 parts of sodium hydroxide to adjust the pH of the reaction system to 5-7; add 98.6 parts of hydroxyethyl acrylate and 4.9 parts of ammonium persulfate to 155.3 parts of water to form a mixed solution, and in 3 hours After ~5 hours of dripping; after the completion of the dropping, keep the constant temperature for 2 hours ~ 4 hours; stop heating, cool to about 40°C and discharge, and the yellow transparent plastic preservation agent solution LJH-2 is obtained.

Embodiment 3

[0025] Add 67.8 parts of citraconic acid, 19.6 parts of styrene, 152.9 parts of AMPS, 92.5 parts of sodium hypophosphite and 308.3 parts of water into a four-neck flask equipped with a stirrer, dropping funnel, condenser tube and thermometer, and heat while stirring to 60°C-70°C; add 39.4 parts of triethanolamine to adjust the pH of the reaction system to 5-7; add 121.5 parts of hydroxyethyl methacrylate and 6.3 parts of potassium persulfate to 191.7 parts of water to form a mixed solution, and 3h~5h to finish the drop; after the dropwise addition, keep the constant temperature for 2h~4h; stop heating, cool to about 40°C and discharge the material, that is, the yellow transparent plastic-preserving agent solution LJH-3 is obtained.

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Abstract

The invention relates to an organic phosphonate concrete plastic retaining agent and a preparation method thereof. The preparation method comprises the following steps: by taking the following components as synthetic monomers: 12-20 percent of sodium hypophosphite, 3-8 percent of styrene, 12-18 percent of unsaturated dicarboxylic acid, 18-26 percent of (methyl) hydroxyalkyl acrylate and 28-45 percent of 2-acrylamide-2-methyl propane sulfonic acid (AMPS), performing aqueous solution polymerization under the action of an initiator, thereby synthesizing an organic phosphonate copolymer. The hydroxyalkyl ester, carboxyl, acylamino, sulfo group and the like introduced into the molecular structure have a certain delayed coagulation effects and good plastic retaining effects. According to the invention, the aqueous solution normal-pressure production is adopted, the equipment requirement is low, the operation is convenient, the method is environmentally friendly, the industrial production is promoted, and the product does not contain chloride ions and does not have corrosion damage to steel bars in the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular to an organic phosphonate concrete plastic retainer, and in particular to a preparation method of the plastic retainer. Background technique [0002] At present, with the development of my country's economy and the construction of large-scale projects, more and more large-volume, high-pump concrete projects appear, and the requirements for the construction performance and durability of concrete are getting higher and higher. At present, long-distance transportation and construction of concrete under high temperature inevitably lead to slump loss of fresh concrete. Traditionally, the method of maintaining the slump of concrete is to apply plasticizers, mainly hydroxycarboxylic acid, phosphate and wood calcium, etc. to delay the hydration time of cementitious materials to reduce the slump loss of concrete. Plastic retaining agent plays an extremely i...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F222/08C08F220/28C08F212/08C04B24/16
Inventor 陈国新祝烨然王冬刘兴荣杜志芹蔡明唐修生温金保付丹华黄国泓
Owner NANJING HYDRAULIC RES INST
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