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Preparation method and application of powdery polycarboxylate slump retaining agent

A technology of slump-retaining agent and polycarboxylic acid, which is used in the field of dry mortar and concrete admixtures, and can solve the problems of difficulty in powdering polycarboxylic acid slump-retaining agent and sticking to walls and caking.

Active Publication Date: 2018-05-29
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention is aimed at the problems existing in the preparation of the above-mentioned powder, and provides a powdery polycarboxylate slump-retaining agent applicable to the field of dry powder mortar and a preparation method thereof, which not only solves the problem that the polycarboxylate slump-retaining agent is difficult to powder, It also solves the problem of wall sticking and agglomeration during the spraying process. The prepared powder has good fluidity, no agglomeration, and good storage stability. Low, excellent slump performance, suitable for special mortars such as self-leveling mortar, grouting material, grouting agent, waterproof mortar and external wall insulation

Method used

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  • Preparation method and application of powdery polycarboxylate slump retaining agent
  • Preparation method and application of powdery polycarboxylate slump retaining agent
  • Preparation method and application of powdery polycarboxylate slump retaining agent

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preparation example Construction

[0064] (1) Preparation of monomer C:

[0065] 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

[0074] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 150 g of deionized water to make a base, purging the reaction vessel with nitrogen while stirring, and raising the temperature to 40 ° C, 20.88 g (0.18 mol )a-3, 31.32g (0.27mol) b-1, 0.36g mercaptoacetic acid and 250g water are configured into solution I, 135g (0.09mol) C-1 and 250g water are configured into solution II, 3.68g diaobai powder and 140g water Configure solution III, add 7.36g 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. % polymer solution, the weight-average molecular weight of the obtained polymer is 11800, which is used for spray drying.

[0075] The above polymer solution is directly dried with a pressure spray dryer, and the specific surface area is 120m2 2 Al2O3 / g, the content is controlled at 10%, the air inlet ...

preparation Embodiment 2

[0077] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 150 g of deionized water to make a base, purging the reaction vessel with nitrogen while stirring, and raising the temperature to 40 ° C, 46.44 g (0.54 mol )a-2, 83.52g (0.72mol) b-1, 2.95g mercaptoacetic acid and 150g water are configured into solution I, 240g (0.12mol) C-2 and 150g water are configured into solution II, 5.55g ascorbic acid and 140g water are configured To form solution III, add 11.1g 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. The polymer solution obtained has a weight-average molecular weight of 26400 and is used for spray drying.

[0078] The above polymer solution is directly dried with a pressure spray dryer, and the specific surface area is 200m2 2 Silica per gram, the content is controlled at 8%, the air in...

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Abstract

The invention discloses a preparation method and application of a powdery polycarboxylate slump retaining agent. The preparation method comprises the following steps: performing free radical polymerization reaction on a carboxylate monomer a, a small monomer b capable of releasing adsorption groups, and a polyether monomer c containing a benzene ring in a water-based medium, so as to obtain a polycarboxylate slump retaining agent mother solution; performing atomization on the polycarboxylate slump retaining agent mother solution through a pressure atomizer, adding a release agent in a spray tower during atomization, then drying the polycarboxylate slump retaining agent mother solution into a powder polycarboxylate slump retaining agent, controlling the average grain diameter of powder, leading a material to a material outlet through an induced draft fan, and packaging through a bagging packaging machine and discharging, so as to obtain the powdery polycarboxylate slump retaining agent.The preparation method not only solves the problem that a polycarboxylate slump retaining agent is difficult to become powder, but also solves the problem the polycarboxylate slump retaining agent adheres to a wall and is agglomerated during atomization; the formed powder is high in flowability, not agglomerated, high in storage stability, low in long distance transportation cost, excellent in slump retaining performance, and applicable to special mortar, such as self-leveling mortar, grouting materials, grouting agents, waterproof mortar and external wall insulation mortar.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a powdery polycarboxylate slump retaining agent 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 suc...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F220/20C08F220/14C08F220/28C04B24/26C08G65/28
CPCC04B24/2694C04B2103/308C08F283/065C08G65/2612C08F220/286
Inventor 刘金芝李申桐杨勇毛永琳周栋梁冉千平
Owner JIANGSU SOBUTE NEW MATERIALS
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