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Composite polycarboxylate superplasticizer mother liquor and preparation method and application thereof

A composite polycarboxylic acid and water reducing agent technology, which is applied in the field of polycarboxylic acid water reducing agent, can solve the problems of double bond breakage of macromonomers, cumbersome operation procedures, and reduced conversion of raw materials, etc., and achieves good slow release and collapse protection. The effect of single performance, single solution performance, and improved water reduction rate

Pending Publication Date: 2020-05-08
SHAANXI YOUBANG NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The properties of these two kinds of mother liquors are relatively single, and the two kinds of mother liquors need to be mixed together when used, and the operation process is cumbersome, time-consuming and laborious; especially in the process of high-temperature production, it is easy to cause the double bond of the macromonomer to break, and then make some macromonomers Loss of activity, unable to participate in the reaction, ultimately leading to a decrease in the conversion of the same raw material, and a subsequent increase in product cost

Method used

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  • Composite polycarboxylate superplasticizer mother liquor and preparation method and application thereof
  • Composite polycarboxylate superplasticizer mother liquor and preparation method and application thereof

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preparation example Construction

[0027] The preparation method of composite polycarboxylate superplasticizer mother liquor specifically comprises the following steps:

[0028] Dissolving component a, hydroxyethyl acrylate and hydroxypropyl acrylate in water to prepare solution A for use; wherein component a is acrylic acid and / or methacrylic acid;

[0029] Dissolve component b and component c in water to prepare solution B for use; wherein, component b is one or more of mercaptopropionic acid, thioglycolic acid or mercaptoethanol, and component c is vitamin C and / or sodium formaldehyde sulfoxylate;

[0030] After adding water to the reaction vessel, put in the macromonomer, and control the temperature of the reaction vessel within the range of 25-31°C, add the oxidant after the macromonomer is completely dissolved, and mix evenly;

[0031] Add the solution A and solution B dropwise into the reaction container respectively, and the dropwise addition time is 2.0-3.5h. After the dropwise addition is completed, ...

Embodiment 1

[0039] 18g of acrylic acid, 20g of hydroxyethyl acrylate and 15g of hydroxypropyl acrylate were dissolved in 30g of water to prepare solution A; 1.5g of mercaptopropionic acid and 0.6g of vitamin C were dissolved in 30g of water to prepare Solution B. Stir solution A and solution B evenly and pour them into the dropping tank.

[0040] Put 280g of water into the reactor and turn on the stirring mode, then put in 310g of methyl butenyl polyoxyethylene ether, heat the reactor in a water bath, and control the temperature of the reactor within the range of 25-31°C; After the butenyl polyoxyethylene ether is completely dissolved, add 4 g of ammonium persulfate and stir for 3 minutes.

[0041] Add solution A and solution B dropwise to the reactor at the same time, the duration of solution A is 2.0h, and the duration of solution B is 3.5h; after the addition is completed, continue to stir and keep warm for 0.5h, and then add After diluting with 290.9 g of the remaining water, contin...

Embodiment 2

[0043] 24g of methacrylic acid, 23g of hydroxyethyl acrylate and 18g of hydroxypropyl acrylate were dissolved in 50g of water to prepare solution A; 1.8g of thioglycolic acid and 0.8g of vitamin C were dissolved in 50g of water to prepare Solution B is obtained. Stir solution A and solution B evenly and pour them into the dropping tank.

[0044] Put 330g of water into the reactor and turn on the stirring mode, then put in 340g of methyl butenyl polyoxyethylene ether, conduct electric heating operation on the reactor, and control the temperature of the reactor within the range of 25-31°C; After the butenyl polyoxyethylene ether is completely dissolved, add 5g of hydrogen peroxide and stir for 5 minutes.

[0045] Add solution A and solution B dropwise to the reaction kettle at the same time, the duration of solution A is 2.5h, and the duration of solution B is 3.0h; after the addition is completed, continue to stir and keep warm for 2.0h, and then add to the reaction kettle Af...

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Abstract

The invention provides a composite polycarboxylate superplasticizer mother liquor as well as a preparation method and application thereof. The composite polycarboxylate superplasticizer mother liquoris prepared from the following materials in parts by mass: 31 to 36 parts of macromonomer, 0.4 to 0.6 part of oxidant, 1.8 to 2.8 parts of component a, 2.0 to 2.5 parts of hydroxyethyl acrylate, 1.5 to 2.0 parts of hydroxypropyl acrylate, 0.15 to 0.20 part of component b, 0.06 to 0.10 part of component c and 55.8 to 63.09 parts of water; wherein the component a is acrylic acid and / or methacrylic acid, the component b is one or more of mercaptopropionic acid, mercaptoacetic acid or mercaptoethanol, and the component c is vitamin C and / or sodium formaldehyde sulfoxylate. The composite polycarboxylate superplasticizer mother liquor with high water-reducing rate and low fluidity time loss is prepared according to the formula at normal temperature, so that the product is convenient to use, widein applicability and low in cost.

Description

technical field [0001] The invention relates to the technical field of polycarboxylate water reducer, in particular to a composite polycarboxylate water reducer mother liquor and its preparation method and application. Background technique [0002] Water reducer is an admixture added before or during concrete mixing to improve the performance of fresh concrete and / or hardened concrete. From the first generation of lignin water reducer, to the second generation of naphthalene-based water reducer, to the current third generation of mainstream polycarboxylate water reducer, through technological innovation, not only widely used in concrete construction, It also plays an increasingly important role in engineering construction. [0003] With the continuous development of the market, higher and higher requirements are put forward for the performance of polycarboxylate superplasticizers, which not only require a high water-reducing rate but also a small loss of fluidity over time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F220/20
Inventor 侯庆伟钱强侯景明徐一伦
Owner SHAANXI YOUBANG NEW MATERIAL TECH
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