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Polycarboxylate water reducer with modified sugar side chain structure and preparation method thereof

A technology of polycarboxylic acid and water-reducing agent, applied in the field of concrete admixtures, can solve the problems of difficulty in guaranteeing concrete quality, low water retention and tackifying effect, influence on concrete strength, etc., and achieves excellent stability performance, small change in fluidity, early high intensity effect

Active Publication Date: 2019-10-15
CCCC SHEC WUHAN PORT NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] These patents have successfully prepared polycarboxylate superplasticizers with side chains containing monosaccharide or polysaccharide structures. The sugar side chain structures in the molecule are all connected to the main chain through ester groups, and the ester groups are in the alkaline environment of concrete. It is easy to hydrolyze and release monosaccharide or polysaccharide molecules. Sugar molecules have retarding effect, and the rate of releasing sugar molecules by hydrolysis is related to the pH and temperature of concrete. With the difference of pH and temperature, the hydrolysis rate is inconsistent so that the released sugar molecules The amount of polycarboxylate is more or less, which makes the setting time of concrete longer or shorter, which affects the strength of concrete formation, and the quality of concrete is difficult to guarantee; in addition, the hydrogen bond between polycarboxylic acid molecules is weakened, and the effect of water retention and viscosity increase is reduced.

Method used

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  • Polycarboxylate water reducer with modified sugar side chain structure and preparation method thereof
  • Polycarboxylate water reducer with modified sugar side chain structure and preparation method thereof
  • Polycarboxylate water reducer with modified sugar side chain structure and preparation method thereof

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preparation example Construction

[0026] The preparation method of a polycarboxylic acid water reducing agent with modified sugar side chain structure of the present invention includes the following steps:

[0027] 1) Add allyl polyethylene glycol, polyethylene glycol monomethyl ether methacrylate and deionized water into the reaction kettle, and heat and dissolve at a temperature of 20 to 80°C to obtain a solution A;

[0028] 2) Add the deionized aqueous solution of ammonium persulfate and the deionized water mixed solution of methacrylic acid and glucose allyl amide monomers to the A solution at the same time, and carry out the heat preservation reaction at the temperature of 60~80℃ 1.0~2.0 h and cool to room temperature to obtain B solution;

[0029] 3) Add 30% mass fraction of liquid caustic soda to the B solution, adjust the pH to 6-8, and obtain 40% mass fraction of polycarboxylic acid water reducing agent with modified sugar side chain structure; allyl polyethylene glycol , The molar ratio of methacrylic acid...

Embodiment 1

[0031] (1) Synthesis of glucose allyl amide monomer: use DMF as solvent, add allyl amine into the reaction kettle, heat to completely dissolve, and then add D-gluconate-δ-lactone to the reaction kettle. React at ℃ for 2h, remove DMF solvent in vacuum, wash with epoxy hexane, filter, recrystallize twice in isopropanol, and dry in vacuum to obtain white powdery glucose allyl amide monomer, D-gluconic acid -The molar ratio of δ-lactone to allylamine is 1:1;

[0032] (2) Polymerization reaction: add allyl polyethylene glycol with a molecular weight of 2000, polyethylene glycol monomethyl ether methacrylate with a molecular weight of 400, and deionized water into the reaction kettle, at a temperature of 20 to 80 ℃ After heating and dissolving, a solution A is obtained; in solution A, the deionized water solution of ammonium persulfate and the deionized water mixed solution of methacrylic acid and glucose allyl amide monomer are added dropwise at the same time, and the mixture is added...

Embodiment 2

[0034] (1) Synthesis of glucose allyl amide monomer: same as Example 1;

[0035] (2) Polymerization reaction: Add allyl polyethylene glycol with a molecular weight of 2400, polyethylene glycol monomethyl ether methacrylate with a molecular weight of 550 and deionized water into the reaction kettle at a temperature of 20 to 80°C After heating and dissolving, A solution is obtained; In solution A, the deionized aqueous solution of ammonium persulfate and the deionized water mixed solution of methacrylic acid and glucose allyl amide monomer are added dropwise at the same time, and the mixture is added dropwise at 80℃ for 3.0h After the dripping is completed, the reaction is kept at 70℃ for 1.5h. After the reaction, it is cooled to room temperature to obtain B solution; then 30% mass fraction of liquid caustic soda is added to B solution, and the pH value is adjusted to 6-8 to obtain the product. It is a polycarboxylic acid water reducing agent with a modified sugar side chain struct...

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Abstract

The invention discloses a polycarboxylic acid water reducer with a modified sugar side chain structure. The general structural formula of the polycarboxylic acid water reducer is shown in the description, wherein a, b, c, d, m and n are polymerization degrees, and are positive integers; a is equal to 8 to 0; b is equal to 1 to 12; c is equal to 50 to 140; d is equal to 1 to 20; m is equal to 45 to 76; n is equal to 9 to 27. The invention further discloses a preparation method of the polycarboxylic acid water reducer. The synthesized polycarboxylic acid water reducer molecularly has an amidated sugar side chain structure, which is more stable in the alkaline environment of concrete compared with an esterified sugar side chain structure, and does not undergo any hydrolysis reaction; after the polycarboxylic acid water reducer is added into concrete, high thickening stability is achieved, excellent water retention and slump resistance are achieved, and the fluidity of net slurry changes slightly after 120 minutes.

Description

Technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polycarboxylic acid water reducer with modified sugar side chain structure and a preparation method thereof. Background technique [0002] As the third-generation high-performance water-reducing agent, polycarboxylic acid water-reducing agent has strong designability of molecular structure and great potential for high-performance. It can be copolymerized by selecting monomers with different functions to prepare multifunctional products . The polycarboxylic acid water-reducing agent modified by monosaccharide functionalization has the advantages of high slump retention, high water retention and viscosity increase. It has good adaptability to different cements, mineral admixtures, low-quality sand and gravel materials, and has a broad market application prospect. A variety of products have come out. [0003] The patent of CN 104961373 B discloses a preparation method of a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F226/02C04B24/26
Inventor 高玉军李顺凯王文荣韦鹏亮陈雍雍明阳
Owner CCCC SHEC WUHAN PORT NEW MATERIALS
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