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Powdery shrinkage-reducing polycarboxylic acid water reducing agent and preparation method thereof

A technology of water reducer and polycarboxylate, which is applied in the field of powder shrinkage reducing polycarboxylate water reducer and its preparation, and can solve the problems of powder affecting concrete strength, no dispersion performance, large dosage, etc.

Active Publication Date: 2020-07-03
JIANGSU SOBUTE NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems that the traditional low-molecular shrinkage reducing agent has a large dosage, almost no dispersion performance, affects the strength of concrete and is difficult to make powder by traditional technology, the present invention provides a powder shrinkage reducing polycarboxylate water reducer and its preparation method, The powder sample has low dosage, good dispersion performance, excellent shrinkage reduction effect, and realizes the unity of water reduction and shrinkage reduction. The powder has good fluidity, no agglomeration, and good storage stability. It is suitable for various dry powder mortars

Method used

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  • Powdery shrinkage-reducing polycarboxylic acid water reducing agent and preparation method thereof
  • Powdery shrinkage-reducing polycarboxylic acid water reducing agent and preparation method thereof
  • Powdery shrinkage-reducing polycarboxylic acid water reducing agent and preparation method thereof

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preparation Embodiment 1

[0069] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, the reaction vessel was purged with nitrogen while stirring, and the temperature was raised to 60°C, and 413.7g (0.7mol) of a-4 and 120g of water were dissolved At the end, 50.4g (0.7mol) b-1, 75.6g (0.35mol) d-1, 2.78g mercaptoethanol and 100g water are configured as drop solution I, and 16.8g (0.14mol) c-1 and 100g water are configured as Solution II, 16.68g L-ascorbic acid and 80g water were prepared as solution III, 27.82g hydrogen peroxide was added to the bottoming water, solutions I and II were added dropwise at a constant speed for 5.5 hours, solution III was added dropwise at a constant speed for 5.75 hours, after the addition was completed, keep warm for 4 hours, Then lower the temperature and neutralize the discharged material to obtain a polymer solution with a concentration of 60%. The weight average molecular weight of the obtained polymer is 11800, whic...

preparation Embodiment 2

[0072]In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel, and a nitrogen inlet tube, the reaction vessel was purged with nitrogen while stirring, and the temperature was raised to 40°C, and 307.4g (0.2mol) of a-3 and 150g of water were dissolved At the end, 46.4g (0.4mol) b-3, 77g (0.14mol) d-3, 9.03g mercaptopropionic acid and 150g water are configured as drop solution I, and 20.6g (0.1mol) c-1 and 60g water are configured as Solution II, 16.68g of Diaobai powder and 120g of water were prepared as solution III, 13.54g of hydrogen peroxide was added to the base water, solutions I and II were added dropwise at a constant speed for 3 hours, solution III was added dropwise at a constant speed for 3.5 hours, after the addition was completed, keep warm for 3 hours, and then Lower the temperature and neutralize the discharged material to obtain a polymer solution with a concentration of 50%. The weight average molecular weight of the obtained polymer is 2360...

preparation Embodiment 3

[0075] In a glass reactor equipped with a thermometer, a stirrer, a dropping funnel and a nitrogen gas inlet tube, the reaction vessel was purged with nitrogen gas while stirring, and the temperature was raised to 25°C, and 307.4g (0.2mol) a-2 and 250g water At the bottom, 21.6g (0.3mol) b-1, 16.5g (0.06mol) d-3, 11.17g thioglycolic acid and 200g water are configured as drop solution I, and 16.52g (0.07mol) c-3 is drop solution II , 2.23g of Diaobai powder and 130g of water were prepared as solution III, 5.59g of hydrogen peroxide was added to the base water, and solutions I and II were added dropwise for 4 hours at variable speeds (40% for the first 1h, and 60% for the next 3h), and solution III was dropped at a constant speed Add for 4.5 hours, after the dropwise addition, keep warm for 2 hours, then cool down and neutralize the material to obtain a polymer solution with a concentration of 40%, and the weight average molecular weight of the obtained polymer is 37500, which is...

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Abstract

The invention discloses a powdery shrinkage-reducing type polycarboxylic acid water reducing agent and a preparation method thereof. The powdery shrinkage-reducing type polycarboxylic acid water reducing agent is prepared by introducing a hydrophobically modified polyether chain, a rigid group and ester bond bridged small molecular alcohol into a grafted copolymer to prepare a shrinkage-reducing type polycarboxylic acid water reducing agent mother solution, and then introducing a calcium-magnesium expanding agent as a separant to spray-dry the mother solution. The prepared powder is low in mixing amount, good in dispersing performance and excellent in shrinkage reducing effect, unification of water reducing and shrinkage reducing is achieved, and the powder is good in flowability, free ofcaking, good in storage stability and suitable for various dry-mixed mortars.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a powdery shrinkage-reducing polycarboxylate water reducer and a preparation method thereof. [0002] technical background [0003] 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. With the development of admixture technology and the change of sand and gravel aggregate materials, high-performance concrete has changed from the original high water-binder ratio and high cement content to low water-binder ratio a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C08F283/06C08F216/14C08F222/02C08F220/06C04B103/30
CPCC04B40/0039C04B24/32C08F283/065C04B2103/302C08F216/1416C08F216/14C04B22/064C04B22/066C08F220/06C08F222/02
Inventor 刘金芝冉千平杨勇黄振李申桐毛永琳
Owner JIANGSU SOBUTE NEW MATERIALS
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