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Powdery early-strength type polycarboxylate water reducing agent and preparation method thereof

An early-strength type and water-reducing agent technology, applied in the field of concrete admixtures, can solve the problems of low cost of long-distance transportation and difficulty in powdering early-strength polycarboxylic acid

Active Publication Date: 2019-03-29
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention is aimed at the problems existing in the preparation of powders, and provides a powdery early-strength polycarboxylate water reducer and its preparation method, which not only solves the problem of early-strength polycarboxylate powder formation, but also meets the requirements of low temperature in winter. According to the strength requirements of dry powder mortar and concrete, the prepared powder has good fluidity and good storage stability. It can be compounded with other powdered polycarboxylate superplasticizers in any proportion, and the cost of long-distance transportation is low. It is suitable for early Special mortars such as self-leveling mortar, grouting material, grouting agent, waterproof mortar and external wall insulation for strength requirements, and various concrete prefabricated products such as beams, plates, columns, pipe piles, segments, and prestressed components

Method used

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  • Powdery early-strength type polycarboxylate water reducing agent and preparation method thereof
  • Powdery early-strength type polycarboxylate water reducing agent and preparation method thereof
  • Powdery early-strength type polycarboxylate water reducing agent and preparation method thereof

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preparation example Construction

[0070] Preparation of monomer a:

[0071] Put the substance of general formula (4) in a 2L dry stainless steel autoclave, add an appropriate amount of catalyst (such as metal sodium), stir and dissolve, seal the autoclave, replace the air in the autoclave with nitrogen for three times, and then evacuate the autoclave When it is below -0.09MPa, turn on the heating, raise the temperature to 120°C, and keep the reactor continuously vacuumed for 30 minutes, then stop, and then continue to slowly feed an appropriate amount of propylene oxide into the reactor to maintain the internal pressure of 0.15-0.2MPa, and the reaction temperature is 110 -150°C, when the propylene oxide feeding is completed, continue the constant temperature reaction until the pressure no longer drops, and after maintaining for 30 minutes, continue to feed an appropriate amount of ethylene oxide into the kettle to maintain the pressure in the kettle at 0.15-0.2MPa, and the reaction temperature is 110- 150°C, w...

preparation Embodiment 1

[0080] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 60 g of water to make a base, and raise the temperature to 15° C., adjust the pH value of the system to 8.5, and then contain 531 g (a-1, 0.09mol), 32.4g (b-1, 0.45mol), 12.96g (c-1, 0.096mol), 6.39g (d-1, 0.09mol), 2.92g mercaptopropionic acid, 1.16g ascorbic acid and 200g aqueous phase Mix and stir to make uniform monomer aqueous solution I, fully dissolve 49.1g of water-soluble calcium salt e-1 in 50g of water as drop solution II, fully dissolve 29.4g of water-soluble silicate f-1 in 80g of water as Add solution III dropwise, and start the reaction. After adding 2.91g of hydrogen peroxide to the bottoming water, start adding solutions I, II and III dropwise for about 2.0 hours at the same time. The concentration is 60%, the weight average molecular weight is 31500, and it is used for spray drying.

[0081] Dilute the above polymer solution to 38%, and then us...

preparation Embodiment 2

[0083] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, add 100 g of water to make a base, and raise the temperature to 35° C., adjust the pH value of the system to 9.5, and then add 390 g of (a-2, 0.06mol), 36.12g (b-2, 0.42mol), 12.42g (c-2, 0.06mol), 20.4g (d-2, 0.24mol), 7.34g mercaptopropionic acid, 2.29g ascorbic acid and 200g aqueous phase Mix and stir to make uniform monomer aqueous solution I, fully dissolve 28.52g of water-soluble calcium salt e-2 in 80g of water as drop solution II, fully dissolve 57.05g of water-soluble silicate f-2 in 80g of water as Add solution III dropwise, and start the reaction. After adding 6.88g of hydrogen peroxide in the bottoming water, start adding solutions I, II and III dropwise for about 6.0 hours at the same time. The concentration is 50%, the weight average molecular weight is 49500, and it is used for spray drying.

[0084] Dilute the above polymer solution to 35%, and then ...

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Abstract

A powdery early-strength type polycarboxylate water reducing agent and a preparation method thereof are disclosed. Rigid groups and a polyether chain having a high molecular weight are introduced intoa polymerization system, and are hybridized with a calcium-silicon composite oxide to obtain a polymer; then a nanometer separating agent is introduced in a spray drying process to finally prepare the water reducing agent. The prepared water reducing agent has good fluidity, no agglomeration, good storage stability and low long-distance transportation cost, and is suitable for special mortar withan early-strength requirement, such as self-leveling mortar, grouting materials, grouting agents, waterproof mortar and external wall insulation mortar, and concrete prefabricated products such as beams, boards, pillars, tubular piles, duct pieces, and prestressed components.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a powdery early-strength polycarboxylate water-reducer and its preparation method. The water-reducer can be applied to dry powder mortar, various beams, boards, Concrete prefabricated products such as columns, pipe piles, segments, prestressed components, etc. 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, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F228/02C08F220/58C08F212/14C08F220/56C04B24/26C04B103/30
CPCC04B24/2694C08F212/14C08F220/56C08F220/58C08F283/065C04B2103/302C08F220/585C08F220/06C08F222/02C08F228/02
Inventor 冉千平刘金芝杨勇李申桐张建纲黄振
Owner JIANGSU SOBUTE NEW MATERIALS
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