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Water reducing agent as well as preparation method and application thereof

A water-reducing agent and polymerization reaction technology, applied in the field of water-reducing agents, can solve the problems of long time and complicated reaction process, and achieve the effect of increasing added value and reducing environmental pollution

Active Publication Date: 2013-03-13
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction process of the process is complicated, the time is too long, and inert gas protection is also required

Method used

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  • Water reducing agent as well as preparation method and application thereof
  • Water reducing agent as well as preparation method and application thereof
  • Water reducing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Place the flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen gas inlet tube in a water bath, add 800 g of straw ethanol waste liquid (50% concentration), 380 g of water, B-1-101 g (0.05 mol), seven 0.24 g of ferrous sulfate in water was stirred evenly, and the temperature was raised to 40° C., while A-19.0 g (0.125 mol) was dissolved in 100 g of monomer solution in 100 g of water, and 0.35 g of hydrogen peroxide (concentration 27%) was dissolved in 100 g of water. Oxidant solution, Dodecanethiol 0.35g dissolved in 100g of water chain transfer agent solution, add dropwise for 1.0h, continue to keep warm for 4.0h, add alkaline substances to neutralize the solution to pH=6.8, to obtain a polymer solution, the solution concentration is 30%, The number average molecular weight of this polymer is 22100, which is denoted as P-1.

Embodiment 2

[0055] Place the flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet pipe in a water bath, add straw ethanol waste liquid 630g (concentration is 50%), water 60g, B-350.4g (0.01mol), B- 424.1g (0.05mol) was stirred evenly, and the temperature was raised to 45°C. Before the dropwise addition of the solution, 0.30g (concentration: 27%) of hydrogen peroxide was added to the reaction bottle, and A-14.32g (0.06mol) dissolved in 70g of water was added dropwise Monomer solution, 0.21g of ascorbic acid dissolved in 70g of water as a reducing agent solution, 0.37g of dodecanethiol dissolved in 70g of water as a chain transfer agent, added dropwise for 2.0h, after the dropwise addition, continue to keep warm for 3.0h, and add alkaline substances to neutralize The pH of the solution was 7.5 to obtain a polymer solution with a solution concentration of 40%. The number average molecular weight of the polymer was 42500, which was denoted as P-2.

Embodiment 3

[0057] Place the flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube in a water bath, add 790 g of straw ethanol waste liquid (50% concentration), 50 g of water, B-226.1 g (0.10 mol), persulfuric acid Potassium 3.24g was stirred evenly, and the temperature was raised to 60°C. At the same time, 0.83g of sodium bisulfite was dissolved in 150g of water as a reducing agent solution, 25.8g of A-2 (0.30mol) was dissolved in 150g of water as a monomer solution, and 0.14g of mercaptoacetic acid was added dropwise. Dissolve the chain transfer agent solution in 150g water, add dropwise for 3.0h, keep warm for 1.0h after the dropwise addition, add alkaline substance to neutralize the polymer solution to pH=8.0, the concentration of the polymer solution is 35%, the polymer The number average molecular weight is 34600, recorded as P-3.

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Abstract

The invention relates to a water reducing agent as well as a preparation method and an application thereof. The preparation method of the water reducing agent comprises: carrying out a free radical polymerization reaction on a straw ethanol waste liquid, a monomer A and a monomer B in an aqueous medium, wherein the straw ethanol waste liquid is generated in a process for manufacturing ethanol from straw, the viscosity of the straw ethanol waste liquid is 15.6-24.5 mPa.s when the mass percentage concentration is 30%, and the solid in the straw ethanol waste liquid comprises 18-25% by mass of cellulose, 1-10% by mass of hemicellulose, 45-60% by mass of lignin and the balance of ash; the molar ratio of the monomer A to the monomer B is (1:5)-(10:1); and the mass sum of the monomer A and the monomer B is 1-50% of the mass of the solid in the straw ethanol waste liquid. Applied in cement-based materials, the water reducing agent prepared by the preparation method provided by the invention has good dispersivity and dispersion retaining property.

Description

technical field [0001] The invention relates to a water reducer, its preparation method and application. Background technique [0002] Water reducer is an admixture that can reduce the amount of mixing water while maintaining the fluidity of concrete basically the same. It is the most widely researched and used concrete admixture at present. Adding water reducing agent during use can improve the workability and fluidity of freshly mixed concrete, increase the strength of concrete, and prolong the service life of concrete components. Therefore, water reducing agent is an indispensable admixture in concrete . [0003] In the mid-to-late 1990s, oil resources were in short supply, food was relatively surplus, and under the pressure of environmental protection caused by automobile exhaust, my country began to study fuel ethanol, but it would consume a lot of food and bring danger to human survival. Therefore, the development of straw fiber ethanol has important strategic signif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F291/08C08F290/06C04B24/26C04B103/30
Inventor 刘加平刘金芝乔敏冉千平缪昌文
Owner JIANGSU SOBUTE NEW MATERIALS