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Ultra-long slump-retaining cement-based polycarboxylate superplasticizer mother liquor and its application

A technology based on polycarboxylic acid and water-reducing agent, which is applied in the field of cement-based building material admixtures. It can solve the problems that the slump performance of cement-based materials cannot be guaranteed, cannot meet the construction requirements at the same time, and the cost of raw materials is high, so as to achieve a high water-reducing rate. , reduce storage equipment, and reduce energy consumption

Active Publication Date: 2022-03-15
CNBM ZHONGYAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the slump-preserving and slow-release superplasticizers in the prior art have high raw material costs and complex processes, and cannot meet the construction requirements of high water reduction and ultra-long-term slump-preserving at the same time. The slump performance cannot be guaranteed, and other types of water reducers need to be compounded during use, and a large number of experiments are required to study the compatibility of other types of water reducers

Method used

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  • Ultra-long slump-retaining cement-based polycarboxylate superplasticizer mother liquor and its application
  • Ultra-long slump-retaining cement-based polycarboxylate superplasticizer mother liquor and its application
  • Ultra-long slump-retaining cement-based polycarboxylate superplasticizer mother liquor and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Experimental study on the synthesis of three kinds of polycarboxylate superplasticizer mother liquors, using isopentenol polyoxyethylene ether TPEG, polyethylene glycol monomethyl ether methacrylate MPEGMAA, acrylic acid, hydroxyethyl acrylate, oxidizing agent hydrogen peroxide, reducing agent VC , chain transfer agent mercaptopropionic acid as raw material, adjust the proportion of each raw material, and carry out the fluidity test of cement slurry with reference to GB / T 8077-2012 "Concrete Admixture Homogeneity Test Method", the mother liquor dosage is 0.8%, the obtained results are as follows As shown in Table 1, "-" means that the pulp has poor fluidity and cannot be tested.

[0034] Table 1 Fluidity test of cement slurry

[0035]

[0036]

[0037] It can be seen from Table 1 that No. 3 water-reducing agent has a low initial water-reducing rate, but it releases after 3 hours and maintains high fluidity. 13-15 have a higher water-reducing rate in the early sta...

Embodiment 2

[0039] The preparation process of three kinds of water reducer mother liquor is as follows:

[0040] 1) Weigh the raw materials in proportion,

[0041] 2) Put isopentenol polyoxyethylene ether and polyethylene glycol monomethyl ether methacrylate into the reactor, and control the reaction temperature to be 30-34°C.

[0042] 3) Add acrylic acid, hydroxyethyl acrylate and oxidant to deionized water, mix to prepare A solution,

[0043] 4) Add chain transfer agent and reducing agent to deionized water, mix and prepare B solution,

[0044] 5) A, B solutions are added dropwise to the reactor to start the polymerization reaction, wherein the time for adding solution A is 2-3h, and the time for adding solution B is 3.5-4h,

[0045] 6) After the dropwise addition of solution B, keep warm for 1.5-2 hours, adjust the pH and discharge.

[0046] Among them, step 6) in the synthesis process of ultra-slow-release polycarboxylate superplasticizer mother liquor SR-1, slow-release polycarbox...

Embodiment 3

[0048] The super slow-release polycarboxylate superplasticizer mother liquor SR-1, the slow-release polycarboxylate superplasticizer mother liquor SR-2 and the water-reducing polycarboxylate superplasticizer mother liquor SR-3 were compounded in different proportions. Refer to GB / T 8077-2012 "Concrete Admixture Homogeneity Experimental Method" to test the fluidity of cement slurry, the amount of compound mother liquor is 0.8%, so as to adjust the initial and later performance of the compound mother liquor, the results are shown in the table 2.

[0049] Table 2 Three kinds of mother liquor compounding properties

[0050]

[0051]

[0052] It can be seen from Table 2 that insufficient SR-1 content will easily lead to insufficient 4-hour fluidity retention performance of cement paste, too high content will easily lead to late bleeding of cement paste, and insufficient SR-3 content will easily lead to initial cement slurry bleeding. Insufficient fluidity and too high dosage...

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Abstract

The invention relates to an ultra-long slump-preserving cement-based polycarboxylate water-reducing agent mother liquor and an application thereof. It is composed of water-reducing polycarboxylate water-reducing agent mother liquor, and the raw materials of the three mother liquors are composed of: prenol polyoxyethylene ether, polyethylene glycol monomethyl ether methacrylate, acrylic acid, hydroxyethyl acrylate, oxidizing agent , reducing agent and chain transfer agent, which can realize the application of high-fluidity cement-based materials in high-temperature working environments, meet the needs of long-distance transportation and high-distance pumping of concrete, have no adverse effect on setting time and strength, and the raw materials are simple and easy to obtain. , the production process is simple, and there is no need to use it in combination with other types of superplasticizers in the later stage.

Description

technical field [0001] The invention relates to a cement-based building material admixture, in particular to a super-long slump-preserving cement-based polycarboxylate superplasticizer mother liquor. Background technique [0002] Since the beginning of the 21st century, with the continuous development of economic construction, the country has invested a lot of manpower and financial resources in the construction of national infrastructure, such as super high-rise buildings, residential buildings, high-speed rail, and highways. As the largest building material, concrete has also ushered in a production peak , while promoting the rapid development of high-performance concrete technology. Recently, the engineering and materials industries have not only required high strength for concrete, but also higher requirements for the durability and constructability of concrete. It can be said that the current gap in concrete technology among countries has changed from the original Ceme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F2/38C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/20
Inventor 李晓宁李婷朱玉雪赵海洋王健宋作宝马强陈家继郝利国
Owner CNBM ZHONGYAN TECH
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