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Preparation method and application of powdery polycarboxylic acid water-reducing agent

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixture and dry powder mortar

Active Publication Date: 2018-06-22
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that the powdered polycarboxylic acid prepared by spray drying needs to add an inorganic release agent, the present invention provides a spray-dried powdered polycarboxylate water reducer without release agent and a preparation method thereof, which not only increases the powdery polycarboxylate The active ingredient of carboxylic acid superplasticizer reduces the production cost of powdered polycarboxylic acid, and the prepared powder has good fluidity, no agglomeration, good storage stability, and can be packed in bags, with low long-distance transportation cost and reduced Excellent water performance, suitable for all kinds of dry powder mortar

Method used

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  • Preparation method and application of powdery polycarboxylic acid water-reducing agent

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preparation example Construction

[0061] (1) Preparation of monomer C:

[0062] Put the substance of general formula (5) or (6) in a 2L dry stainless steel autoclave, add an appropriate amount of catalyst and polymerization inhibitor, stir and dissolve, close the reactor, replace the air in the reactor with nitrogen three times, and then react Vacuumize the kettle to below -0.09MPa, turn on the heating, raise the temperature to 120°C, keep the reactor continuously vacuumed for 30 minutes and then stop, then continue to slowly feed an appropriate amount of propylene oxide into the reactor to maintain the internal pressure of 0.15 ~ 0.2MPa, The reaction temperature is 110-150°C. After the feeding of propylene oxide is completed, continue the constant temperature reaction until the pressure no longer drops. After maintaining for 30 minutes, continue to feed an appropriate amount of ethylene oxide into the kettle to maintain the pressure in the kettle. 0.15 ~ 0.2MPa, the reaction The temperature is 110-150°C. Afte...

preparation Embodiment 1

[0072]In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 60 g of deionized water to make a base, purging the reaction vessel with nitrogen while stirring, and raising the temperature to 40 ° C, 34.56 g (0.48 mol )a-1, 320g (0.16mol) C-1, 0.74g thioglycolic acid and 350g water are configured into solution I, 16.48g (0.08mol) b-1 and 70g water are configured into solution II, 0.74gL-ascorbic acid and 80g water Configure solution III, add 3.71g of hydrogen peroxide into the bottoming water, add solution I and II dropwise at a constant speed for 2 hours, and add solution III dropwise at a constant speed for 2.25 hours, after the dropwise addition, keep it warm for 2 hours, then cool down and neutralize the material to obtain a concentration of 40 % polymer solution, the weight-average molecular weight of the obtained polymer is 21800, which is used for spray drying.

[0073] Dry the above polymer solution directly with a ce...

preparation Embodiment 2

[0075] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 130 g of deionized water to make a base, purging the reaction vessel with nitrogen while stirring, and raising the temperature to 60 ° C, 51.6 g (0.6 mol )a-2, 300g (0.1mol) C-2, 1.88g mercaptoethanol, 2.25g sodium bisulfite and 300g water are configured into solution I, 23.6g (0.1mol) b-1 is configured into solution II, 6.75g over Ammonium sulfate and 150g of water are prepared as solution III, solutions I and II are added dropwise at a variable speed for 3 hours, and solution III is added dropwise at a variable speed for 3.5 hours. After the addition is completed, keep warm for 3 hours, then cool down and neutralize the material to obtain a polymer with a concentration of 40%. solution, the weight-average molecular weight of the obtained polymer is 35,000, which is used for spray drying.

[0076] Dry the above polymer solution directly with a centrifugal spray ...

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Abstract

The invention discloses a preparation method and application of a powdery polycarboxylic acid water-reducing agent. The preparation method comprises the following steps: preparing from a carboxylic acid monomer a, a benzene ring-containing small monomer b and a benzene ring-containing polyether monomer c in an aqueous medium through free radical copolymerization to obtain polycarboxylic acid water-reducing agent mother liquor; and directly forming the polycarboxylic acid water-reducing agent mother liquor into fog drops through a centrifugal atomizer for a sprayer without adding an isolation agent, controlling the average particle size of powder to be 50-150 [mu]m, drying into powder after the fog drops enter a drying room, leading a material to a discharge port through an induced draft fan, and packaging and discharging by adopting a bagged packaging machine to obtain the powdery polycarboxylic acid water-reducing agent. The preparation method disclosed by the invention has the benefits that not only is the effective content of polymers in the powder improved, but also the production technical process is reduced, and the production cost is reduced; and the prepared powdery polycarboxylic acid water-reducing agent is optimal in fluidity, incapable of caking, high in storage stability, low in long-distance transportation cost, excellent in water-reducing property and suitable for various dry mortar.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a powdery polycarboxylate water reducer and a preparation method thereof. The water reducer can be applied to the field of dry powder mortar. technical background [0002] Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, low concrete shrinkage rate, strong molecular structure adjustability, clean production process, and does not affect the later strength. With the application of polycarboxylate superplasticizer With the maturity of technology, polycarboxylate superplasticizers are widely used in high-speed railways, highways, hydropower, nuclear power, large bridges and other projects, and have produced huge economic and social benefits. These water-reducing agents are mainly in the form of water agents, and the long-distance transportation costs are high, and they are not suitable for special mortars such as dry...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F212/14C08F212/12C08F222/02C04B24/26C04B24/16C04B103/30
CPCC04B24/165C04B24/2694C04B2103/302C08F283/065
Inventor 刘金芝李申桐杨勇张建纲周栋梁冉千平
Owner JIANGSU SOBUTE NEW MATERIALS
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