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Slow-release controllable polycarboxylate superplasticizer mother liquor and preparation method thereof

A technology of polycarboxylic acid and water reducer, which is applied in the field of admixtures for cement-based building materials, and can solve the problems of cement slurry bleeding, hardening, and the inability to accurately control the initial fluidity of cement slurry.

Active Publication Date: 2021-03-19
CNBM ZHONGYAN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned admixtures often have defects in the initial water-reducing rate, and most of them need to be compounded with a water-reducing admixture to ensure that the cement-based material has both initial and later fluidity. The fluidity cannot be precisely controlled, and the fluidity of the cement slurry after the slow release in the later stage also has poor fluidity, or the slow release effect is too strong, resulting in bleeding and hardening of the cement slurry in the later stage

Method used

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  • Slow-release controllable polycarboxylate superplasticizer mother liquor and preparation method thereof
  • Slow-release controllable polycarboxylate superplasticizer mother liquor and preparation method thereof
  • Slow-release controllable polycarboxylate superplasticizer mother liquor and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Experimental study on the synthesis of mother liquor of slow-release and controllable polycarboxylate superplasticizer, using large monomer TPEG, small diester monomer, small monoester monomer, functional monomer, oxidizing agent, reducing agent, and chain transfer agent for synthesis Research, in which the small diester monomers use polyethylene glycol bismaleic acid monoester DD1 or polyethylene glycol diacrylate DD2, the monoester small monomers use hydroxyethyl acrylate XD1, and the functional monomers use acrylic acid GN , the oxidizing agent selects hydrogen peroxide for use, the reducing agent selects VC for use, and the chain transfer agent selects mercaptopropionic acid for use, and the preparation method comprises the following steps:

[0032] 1) Weighing synthetic raw materials in proportion,

[0033] 2) Put the macromonomer TPEG, small diester monomers, and small monoester monomers into the reactor, stir and mix evenly, and control the reaction temperature t...

Embodiment 2

[0044] Select the mix ratio of number 4 in Example 1, adjust the hydrolysis pH value, hydrolysis time and hydrolysis temperature, and study the influence of hydrolysis parameters in step 6) of the preparation method on the performance of the polycarboxylate superplasticizer mother liquor, referring to GB / T 8077-2012 " Test method for homogeneity of concrete admixtures" to test the fluidity of cement paste, the mother liquor content is 0.7%. The obtained results are shown in Table 2.

[0045] Table 2 influence of hydrolysis parameters

[0046]

[0047]

[0048] The hydrolysis process of branched-chain ester groups of polycarboxylate superplasticizers is an endothermic process. The higher the pH value, the higher the temperature, and the longer the time, the more ester groups are hydrolyzed. The mother liquor promotes the initial fluidity of the cement slurry, and the ester group remaining in the polycarboxylate superplasticizer polymer continues to hydrolyze during the c...

Embodiment 3

[0050] The polycarboxylate superplasticizer mother liquor with the ratio of No. 4 and No. 9 in Example 1 was subjected to a self-compacting concrete test, and a sodium gluconate retarder and a cellulose ether water-retaining agent were prepared to form a water-retaining slow-release product with a solid content of 20%. PC-type polycarboxylate superplasticizer PC, using 42.5 grade ordinary Portland cement, machine-made sand (powder content ≤ 6%), washed river sand (fineness modulus 2.6), continuous gradation of stones from 5 to 20mm, powder The coal ash is grade II, and the mineral powder is grade S95. The mix ratio of self-compacting concrete is shown in Table 3.

[0051] Table 3 Self-compacting concrete mix ratio (kg / m3)

[0052]

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Abstract

The invention relates to slow release controllable polycarboxylic acid water reducer mother liquor and a preparation method thereof. The polycarboxylic acid water reducer mother liquor is controlled in a slow release manner by taking a large monomer TPEG, a single ester small monomer, a double ester small monomer and a functional monomer as a polymerizing monomer and adjusting the pH of the polycarboxylic acid water reducer polymer to be strongly alkaline for partial hydrolysis.

Description

technical field [0001] The invention relates to an admixture for cement-based building materials, in particular to a slow-release and controllable polycarboxylate water reducer mother liquor. Background technique [0002] Cement concrete is the most bulky and widely used raw material in modern engineering. Compared with other engineering materials such as steel and wood, concrete has a wide source of raw materials and a simple production process. In the 21st century, with the continuous acceleration of national infrastructure construction and the continuous improvement of engineering difficulty, traditional concrete can no longer meet the construction and durability needs of century engineering. High-performance concrete is easy to pour, vibrated and compacted, has good strength and durability, and has good adaptability in harsh environments. The core of high-performance concrete, and even ultra-high-performance concrete, is the production and use technology level of concre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/20C08F220/06C08F222/20C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F222/1063
Inventor 李晓宁李婷朱玉雪赵海洋王健宋作宝马强瞿海洋陈家继闫超强
Owner CNBM ZHONGYAN TECH
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