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A kind of preparation method of anti-mud type sodium alginate side chain comb polycarboxylate superplasticizer

A comb-shaped polycarboxylic acid and sodium alginate technology, which is applied in the field of concrete admixtures, can solve the problems of poor clay adaptability, cumbersome synthesis process, poor initial flow performance of clay-resistant polycarboxylate water-reducing agent, etc., so as to reduce the use of Quantity, cost reduction, strong steric hindrance effect

Active Publication Date: 2021-06-15
HAINAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the deficiencies in the anti-mud effect of the modified side chain and side chain end group in the polycarboxylate water reducer in mud-containing concrete, the present invention provides a preparation method of a mud-resistant sodium alginate side chain comb-shaped polycarboxylate water reducer , to solve the shortcomings of mud-resistant polycarboxylate superplasticizers such as poor initial fluidity, cumbersome synthesis process, and poor clay adaptability

Method used

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  • A kind of preparation method of anti-mud type sodium alginate side chain comb polycarboxylate superplasticizer

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Experimental program
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Effect test

Embodiment 1

[0025] Preparation of anti-mud amides monomer:

[0026] (1) Add 150 parts of sodium alginate sequentially by weight into the reactor and stir overnight for 24 hours until the sodium alginate is completely dissolved. Then the pH value of the sodium alginate solution was adjusted to 3.6 with 5 parts of hydrochloric acid solution. Add 0.1 part of formaldehyde, 0.2 part of acrylamide and 0.4 part of cyclohexylisonitrile to the reaction kettle in sequence, and stir rapidly at room temperature to make the mixed solution undergo Uji reaction for 24 hours. After the reaction is completed, purification and drying are carried out to obtain an anti-sludge amide monomer containing a sodium alginate side chain;

[0027] Preparation of mud-resistant sodium alginate side chain comb-shaped polycarboxylate superplasticizer:

[0028] (2) successively by weight 200 parts of isopentenyl polyoxyethylene ethers namely TPEG2400, 0.1 part of anti-mud amide monomer of the sodium alginate side chain ...

Embodiment 2

[0034] Preparation of anti-mud amides monomer:

[0035] (1) Add 150 parts of sodium alginate sequentially by weight into the reactor and stir overnight for 24 hours until the sodium alginate is completely dissolved. Then the pH value of the sodium alginate solution was adjusted to 3.6 with 5 parts of hydrochloric acid solution. Add 0.1 part of formaldehyde, 0.2 part of acrylamide and 0.4 part of cyclohexylisonitrile to the reaction kettle in sequence, and stir rapidly at room temperature to make the mixed solution undergo Uji reaction for 24 hours. After the reaction is completed, purification and drying are carried out to obtain an anti-sludge amide monomer containing a sodium alginate side chain;

[0036] Preparation of mud-resistant sodium alginate side chain comb-shaped polycarboxylate superplasticizer:

[0037] (2) By weight, 175 parts of TPEG2400, 0.1 part of anti-mud amide monomer of sodium alginate side chain synthesized in step (1), 15 parts of small monomer acrylic...

Embodiment 3

[0043] Preparation of anti-mud amides monomer:

[0044] (1) Add 150 parts of sodium alginate sequentially by weight into the reactor and stir overnight for 24 hours until the sodium alginate is completely dissolved. Then the pH value of the sodium alginate solution was adjusted to 3.6 with 5 parts of hydrochloric acid solution. Add 0.1 part of formaldehyde, 0.2 part of acrylamide and 0.4 part of cyclohexylisonitrile to the reaction kettle in sequence, and stir rapidly at room temperature to make the mixed solution undergo Uji reaction for 24 hours. After the reaction is completed, purification and drying are carried out to obtain an anti-sludge amide monomer containing a sodium alginate side chain;

[0045] Preparation of mud-resistant sodium alginate side chain comb-shaped polycarboxylate superplasticizer:

[0046] (2) By weight, 150 parts of TPEG2400, 0.1 part of anti-mud amide monomer of sodium alginate side chain synthesized in step (1), 15 parts of small monomer acrylic...

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Abstract

The invention discloses a mud-resistant sodium alginate side chain comb-shaped polycarboxylate water reducer and a preparation method thereof. The raw materials for preparing the water reducer include: side chain macromonomer isopentenyl polyoxyethylene ether (TPEG2400) , main chain small monomer acrylic acid, chain transfer agent sodium methacrylate, chain initiator ammonium persulfate, sodium alginate and various parts of water. Acrylamide with a double bond was introduced on sodium alginate in advance by using the Uggi reaction. Secondly, use the aqueous solution free radical polymerization method to polymerize with each monomer, use the water retention effect of the hydrophilic group on the molecular structure of sodium alginate, and the spatial conformation of the long chain molecule of sodium alginate to synthesize the anti-mud comb modified by sodium alginate Shaped polycarboxylate superplasticizer. In cement slurry and concrete mixed with clay, it has excellent dispersibility and working performance, and reduces the sensitivity of polycarboxylate superplasticizer to clay. Promoting the application of natural polysaccharides in concrete additives is of great significance for the synthesis of green and environmentally friendly concrete admixtures.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, and relates to a preparation method of a water reducer, in particular to a mud-resistant sodium alginate side chain comb-shaped polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete is the largest and most widely used building material in the world, and is widely used in various railways, bridges, roads and civil engineering. The wide application of low-quality sand and gravel in construction materials has increased the clay content in concrete. The resulting problem is that the high content of clay greatly reduces the initial fluidity and slump of concrete, and more seriously, increases the viscosity of high-strength concrete, making it difficult to meet pumping requirements. Clay mainly includes three categories of montmorillonite, kaolin and bentonite. Among them, due to its own 2:1 silica tetrahedron and alumina octahedron sheet c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F290/10C08F220/06C08F228/02C04B24/16C04B103/30
CPCC04B24/165C04B24/168C04B2103/302C08F283/065C08F290/10C08F220/06C08F228/02
Inventor 潘莉莎李明益李嘉诚冯慧徐鼐庞素娟
Owner HAINAN UNIV
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