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Early-strength polycarboxylic acid composite water reducer and preparation method thereof

A composite superplasticizer and polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of polycarboxylate superplasticizers such as low molecular weight, obvious chain transfer effect, and insufficient slump performance, and achieve long-term storage uniformity and stability, early Excellent performance and good slump protection effect

Pending Publication Date: 2019-06-07
JIANGMEN POLYTECHNIC
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0010] (3) The polymerization activity of sodium tripropylene sulfonate in the prior art is low, the chain transfer effect is obvious, and the molecular weight of the polycarboxylate superplasticizer obtained is on the low side, and problems such as insufficient slump retention performance and unbalanced comprehensive performance are prone to occur in the actual application process

Method used

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  • Early-strength polycarboxylic acid composite water reducer and preparation method thereof
  • Early-strength polycarboxylic acid composite water reducer and preparation method thereof
  • Early-strength polycarboxylic acid composite water reducer and preparation method thereof

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preparation example Construction

[0034] Such as figure 1 As shown, the preparation method of the early-strength polycarboxylate composite water reducer provided by the embodiment of the present invention includes the following steps:

[0035] S101: Based on polycarboxylate water reducers, polycarboxylate water reducers include modified enol polyoxyethylene ethers containing unsaturated double bonds, sulfonates of aliphatic unsaturated double bonds and unsaturated Three monomers of saturated carboxylic acid;

[0036] S102: Compounded with organic early-strength components and inorganic early-strength catalysts, in parts by mass, 30-60 parts of polycarboxylic acid-based water reducer, 3-10 parts of organic early-strength components, and 20 parts of inorganic early-strength catalysts ~ 50 parts, water 50-80 parts; stirring and mixing for 10-30 minutes to obtain an early-strength polycarboxylic acid composite water reducer.

Embodiment 1

[0039] The first step: prepare material A: dissolve 2.64 parts of sodium methacrylate with deionized water, stir and dissolve, add 9.60 parts of acrylic acid, stir well and set aside;

[0040] Step 2: Prepare material B: dissolve 0.54 parts of mercaptopropionic acid with deionized water;

[0041] Step 3: Dissolve 95 parts of isopentenol polyoxyethylene ether with a molecular weight of 3800 in deionized water, then add 1.07 parts of ammonium persulfate, raise the temperature to 60±2°C, and add A and B materials dropwise at a uniform speed. The dropping time is 1.5h, and the dropping time of material B is 2h;

[0042] Step 4: Keep the temperature constant for 2.5 hours to obtain a polycarboxylate water reducer.

[0043]Step 5: Take 42 parts of the polycarboxylate water-reducer (40% concentration) prepared above, and then add 60 parts of water, 4 parts of triethanolamine, 21 parts of magnesium thiocyanate, and 10 parts of formic acid in a stirring state. Calcium, fully dissolve...

Embodiment 2

[0045] Step 1: Prepare material A: Dissolve 2.15 parts of sodium methacrylate in deionized water, stir to dissolve, add 9.82 parts of acrylic acid, stir well and set aside;

[0046] Step 2: Prepare material B: dissolve 0.54 parts of mercaptopropionic acid with deionized water;

[0047] Step 3: Dissolve 95 parts of isopentenol polyoxyethylene ether with a molecular weight of 3800 in deionized water, then add 1.07 parts of ammonium persulfate, raise the temperature to 60±2°C, add material A, B, and material A at a uniform speed The dropping time is 1.5h, and the dropping time of material B is 2h;

[0048] The fourth step: keep the temperature for 2.5 hours to obtain a polycarboxylate water reducer.

[0049] Step 5: Take 40 parts of the polycarboxylate water-reducer (concentration: 40%) prepared above, and then add 63 parts of water, 3.5 parts of triethanolamine, 18 parts of magnesium thiocyanate, and 11 parts of formic acid in a stirring state. Calcium, fully dissolved and lef...

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Abstract

The invention belongs to the technical field of concrete admixture and discloses an early-strength polycarboxylic acid composite water reducer and a preparation method thereof. As the early-strength composite water reducer is prepared by compounding a polycarboxylic acid-based polymer as the base and the optimized early-strength components, wherein the polycarboxylic acid-based polymer uses threemonomers of modified enol-based polyoxyethylene ether containing unsaturated double bond, aliphatic unsaturated double-bond sulfonate and unsaturated carboxylic acid as main raw materials under the action of initiator and chain transfer agent; the polycarboxylic acid water reducer is prepared by aqueous solution copolymerization initiated by free radicals. The early-strength polycarboxylic acid composite water reducer prepared by the invention has the advantages of small dosage, low alkali content, high water reduction rate, remarkable improvement of early strength, good product stability, simple preparation process and no environmental pollution. It can be widely used in various concrete engineering construction with early strength requirements under lower temperature conditions, especially in the low energy consumption production process of precast concrete members, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to an early-strength polycarboxylate composite water reducer and a preparation method thereof. Background technique [0002] At present, the closest existing technology: With the vigorous development of concrete preparation and construction technology, water reducing agent, as one of the most important members of concrete chemical admixtures, has attracted more and more attention from researchers at home and abroad. The demand for early-strength polycarboxylate superplasticizers with water-reducing and high-early-strength properties is becoming more and more urgent. [0003] Early-strength polycarboxylate superplasticizer can accelerate the hydration of cement, improve the working performance of concrete, effectively shorten the setting time of concrete, and obviously improve the early strength of concrete, thus playing an irreplaceable role in the development of modern ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B28/00C08F283/06C08F228/02C08F220/06C04B103/30
Inventor 孙宁曹禹徐朝华李珩陈锦光
Owner JIANGMEN POLYTECHNIC
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