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Preparation method and application of molasses retarding and water-reducing agent

A technology of retarded water reducer and molasses, which is applied in the field of preparation of molasses retarded water reducer, which can solve the problems of low water reduction rate and fast loss of molasses, and achieve improved dispersion performance, short reaction time, and improved water reduction low rate effect

Active Publication Date: 2012-08-29
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The above method is to change the performance of molasses by chelating sugar and calcium ions into sugar calcium, or hydrolyzing molasses at high temperature, but the water reduction rate of molasses modified by these methods is not large, about 6-8%, and the loss faster

Method used

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  • Preparation method and application of molasses retarding and water-reducing agent
  • Preparation method and application of molasses retarding and water-reducing agent
  • Preparation method and application of molasses retarding and water-reducing agent

Examples

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Effect test

Embodiment 1

[0048] Place a flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube in a water bath, add molasses 200g, water 50g, B 2 -830g, stir 0.2g of ferrous sulfate heptahydrate evenly, heat up to 30°C, and simultaneously add A-14g monomer solution dissolved in 30g water dropwise, hydrogen peroxide 0.07g (concentration 30%) oxidant solution dissolved in 30g water, mercapto Propionic acid 0.37g is dissolved in 20g water chain transfer agent solution, add dropwise for 1h, continue to keep warm for 2h, add 25.4g 30% NaOH solution to neutralize the polymer to pH=8.0, and obtain the polymer solution, the weight average of the polymer The molecular weight is 21000, which is recorded as P-1.

Embodiment 2

[0050] Place a flask equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet tube in a water bath, add molasses 200g, water 50g, B 2 -712.2g Stir evenly, heat up to 45°C, add 0.29g of hydrogen peroxide (concentration 30%) in the reaction bottle before starting to drop the solution, and drop A-22.5g monomer solution dissolved in 20g of water at the same time, 0.25g of ascorbic acid A reducing agent solution dissolved in 25g of water, 0.15g of thioglycolic acid dissolved in 20g of water as a chain transfer agent was added dropwise for 3 hours, continued to keep warm for 4 hours, and 5.0g of 30% NaOH solution was added to neutralize the polymer pH=6.0 to obtain a polymer solution , the weight average molecular weight of the polymer is 31200, denoted as P-2.

Embodiment 3

[0052] Place the flask equipped with a thermometer, stirrer, dropping funnel and nitrogen inlet tube in a water bath, add 300g of molasses, 75g of water, B 1 -427.5g, 0.25g ammonium persulfate, stir evenly, heat up to 55°C, and dropwise add reducing agent solution of 0.09g sodium bisulfite dissolved in 40g water, 11.5g B 1 -1 and 3.7gA-3 dissolved in 60g water monomer solution, dodecanethiol 0.01g dissolved in 40g water chain transfer agent solution, add dropwise for 1.5h, keep warm for 5h, add 13.7g 30% NaOH solution to neutralize The pH of the polymer is 7.5, and the weight average molecular weight of the polymer is 35100, denoted as P-3.

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Abstract

The invention discloses a preparation method and application of a molasses retarding and water-reducing agent. The preparation method is performed by carrying out free radical polymerization reaction on molasses, a monomer A for providing an adsorption group and a monomer B for providing steric hindrance in an aqueous medium until the molecular weight of the polymer is 20000-50000, wherein the molar ratio of the monomer A to the monomer B is 1:10-10:1, and the total mass of the monomer A and the monomer B is 1-25% of that of molasses solid. The invention has the advantages of simple method, convenient production operation process and short reaction time, enhances the dispersion properties of molasses, improves the performance of molasses with low a water-reducing rate and a high loss speed, and can not cause the generation of insoluble substances, and has no precipitate generated while compounding with naphthalenes.

Description

technical field [0001] The invention relates to a preparation method and application of a molasses retarding water reducer, belonging to the field of concrete admixtures. technical background [0002] Molasses is an important by-product of a sugar factory, with a solid concentration as high as 70-90%, containing hydrophilic colloids, inorganic salts, sucrose, reducing sugar and some colored substances, of which sucrose accounts for about 30%, and reducing sugar accounts for 15-20% %. Molasses can be used as a raw material for alcohol, yeast, soy sauce, monosodium glutamate, etc., and can also be used as an admixture in the construction industry, so it is of great significance to rationally utilize waste molasses. [0003] Molasses is basically used in the form of sugar calcium as a retarding water reducer in the construction industry. For the synthesis of sugar calcium, detailed reports have been made in many patents. In the patent CN1067231, dilute the molasses to 1.22-1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F2/44C08F4/40C04B24/26
Inventor 刘金芝缪昌文刘加平冉千平张建纲
Owner JIANGSU SOBUTE NEW MATERIALS
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