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A kind of anti-mud type polycarboxylate water reducer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of mud-resistant polycarboxylate water reducing agent and its preparation, and can solve the problems of limited water reducing rate and increased cost

Active Publication Date: 2018-02-27
LIAONING OXIRANCHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, CN103787608A prepared a small molecule regulator, but its own water reducing rate is limited, and it needs to be compounded with water reducing agent in application
However, when the compound method solves the problem of aggregate mud content, it will not only bring about a substantial increase in cost, but also cause problems such as compatibility of organic and inorganic components, storage stability, etc.

Method used

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  • A kind of anti-mud type polycarboxylate water reducer and preparation method thereof
  • A kind of anti-mud type polycarboxylate water reducer and preparation method thereof
  • A kind of anti-mud type polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of Unsaturated Polyhydroxy Quaternary Ammonium Salt Initiator

[0053] Add 217g of 3-chloro-2-methylpropene, 80g of NaOH and 60g of water into a four-neck flask, heat to 70°C under nitrogen atmosphere and stir evenly, then add dropwise a mixture of 290g of triethanolamine and 10g of water, and reflux after the dropwise addition React under the conditions for 6 hours, remove the NaOH solid by filtration, and distill the reaction solution under reduced pressure at 60kPa vacuum and 90°C to obtain the unsaturated polyhydroxy quaternary ammonium salt initiator A1.

[0054] The NMR spectrum of A1 as figure 1 As shown, according to the measurement results of NMR spectrum, it can be concluded that A1 has a structural formula as shown in formula (1).

[0055]

[0056] Preparation of Unsaturated Quaternary Ammonium Polyether

[0057] Place 55.6g of initiator A1 and 1g of sodium hydride in a high-pressure reactor, replace with nitrogen, raise the temperature to 80...

Embodiment 2

[0062] Preparation of Unsaturated Polyhydroxy Quaternary Ammonium Salt Initiator

[0063] Add 267g of 3-bromo-2-methylpropene, 80g of NaOH and 60g of water into a four-neck flask, heat to 70°C under nitrogen atmosphere and stir evenly, then add dropwise a mixture of 420g of triisopropanolamine and 10g of water, dropwise After the addition, the reaction was carried out under reflux for 6 hours, the NaOH solid was removed by filtration, and the reaction solution was distilled under reduced pressure at 60KPa vacuum and 90°C to obtain the unsaturated polyhydroxy quaternary ammonium salt initiator A2.

[0064] The NMR spectrum of A2 as figure 2 As shown, according to the measurement results of NMR spectrum, it can be concluded that A2 has a structural formula as shown in formula (2).

[0065]

[0066] Preparation of Unsaturated Quaternary Ammonium Polyether

[0067] Place 111.6g of initiator A2 and 1g of potassium hydride in a high-pressure reactor, replace with nitrogen, rai...

Embodiment 3

[0072] Preparation of Unsaturated Polyhydroxy Quaternary Ammonium Salt Initiator

[0073] Add 217g 1-chloro-3-methyl-2-butene, 80g NaOH and 60g water into a four-neck flask, heat to 70°C under nitrogen atmosphere and stir evenly, then add 400g triisopropanolamine and 10g water dropwise The mixture was reacted under reflux for 6 hours after the dropwise addition, and the NaOH solid was removed by filtration. The reaction solution was distilled under reduced pressure at 60KPa vacuum and 90°C to obtain the unsaturated polyhydroxy quaternary ammonium salt initiator A2.

[0074] The NMR spectrum of A3 as image 3 As shown, according to the measurement results of NMR spectrum, it can be concluded that A3 has a structural formula as shown in formula (3).

[0075]

[0076] Preparation of Unsaturated Quaternary Ammonium Polyether

[0077] 73.6g of initiator A3 and 1g of KOH were placed in a high-pressure reactor, replaced with nitrogen, and the temperature was raised to 80°C, and et...

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Abstract

The invention provides an anti-mud-type polycarboxylic-acid water-reducing agent. The agent comprises a structural unit as shown in the specification, wherein A and B are independently selected from a structural unit of ethylene oxide or propylene oxide; R1, R2 and R3 are respectively selected from hydrogen or C1-C20 alkyl groups; R4, R5, R6 and R7 are respectively selected from C1-C20 alkylidene groups; m, n, p, x, y and z are integers larger than or equal to zero, wherein m and x are not 0 at the same time, n and y are not 0 at the same time, and p and z are not 0 at the same time; and X is selected from Cl, Br or I. The invention also provides a preparation method for the anti-mud-type polycarboxylic-acid water-reducing agent. According to the invention, when the mud content of aggregate is high, the polycarboxylic-acid water-reducing agent provided by the invention can be used to avoid adverse effects of the mud content of the aggregate in premixed concrete on the polycarboxylic-acid water-reducing agent; and on the premise that the mixing amount of the polycarboxylic-acid water-reducing agent is not improved, the problems like insufficient water reduction, large slump loss and low strength of concrete are solved.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a mud-resistant polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate water reducer is more and more widely used in concrete engineering because of its excellent properties such as high water reducing rate, high slump retention, high reinforcement and high durability. However, with the serious deterioration trend of sand and gravel aggregate, the content of clay minerals is getting higher and higher. A large number of engineering examples and studies have shown that clay minerals will lead to a decrease in the strength and durability of concrete, and significantly reduce the dispersion performance of water reducers, especially polycarboxylate water reducers. The adaptability between polycarboxylate superplasticizer and concrete raw materials has always been an important reason restricting the wide application of polycarbox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C04B24/32
Inventor 朱建民刘兆滨董振鹏周立明范立
Owner LIAONING OXIRANCHEM INC
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