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Organic-inorganic hybrid polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylic acid and water-reducing agent, applied in the field of concrete, can solve the problems of difficulty in further perfecting the compatibility of concrete, lack of inorganic particle characteristics, and difficulty in achieving breakthrough improvement in adaptability, and achieves excellent water-reduction and enhancement effects, Conducive to the effect of small changes in early strength and fluidity

Active Publication Date: 2020-07-03
CCCC SHEC WUHAN PORT NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, even if the organic polycarboxylate superplasticizer is designed with more molecular structures, it still lacks the characteristics of some inorganic particles, and it is difficult to further improve the compatibility with inorganic concrete, and it is difficult to achieve a breakthrough improvement in adaptability.

Method used

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  • Organic-inorganic hybrid polycarboxylate water reducer and preparation method thereof
  • Organic-inorganic hybrid polycarboxylate water reducer and preparation method thereof
  • Organic-inorganic hybrid polycarboxylate water reducer and preparation method thereof

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preparation example Construction

[0028] A method for preparing an organic-inorganic hybrid polycarboxylate water reducer of the present invention comprises the following steps:

[0029] 1) Add methallyl polyoxyethylene ether, polyethylene glycol monomethyl ether methacrylate and deionized water into the reaction kettle, heat and dissolve at a temperature of 20-80°C to obtain a solution;

[0030] 2) Add the deionized aqueous solution of ammonium persulfate and the deionized water mixed solution of acrylic acid and unsaturated nano-silica monomer dropwise at the same time respectively, and carry out the heat preservation reaction at a temperature of 60-80°C for 1.0-2.0h And be cooled to room temperature to obtain B solution;

[0031]3) Add liquid caustic soda with a mass fraction of 30-32% in solution B, adjust the pH value to 6-8, and obtain an organic-inorganic hybrid polycarboxylate water-reducer with a mass fraction of 40%; methallyl polyoxygen The molar ratio of vinyl ether, polyethylene glycol monomethyl...

Embodiment 1

[0035] (1) Synthesis of unsaturated nano-silica monomer: use toluene dewatered by 3A molecular sieves as a dispersant, add allyltrimethoxysilane and nano-silica to the reaction kettle, and ultrasonically disperse for 10 minutes. Reflux at 80°C for 4 hours, cool to room temperature after the reaction, centrifuge at 13,000 rpm, wash the precipitate several times with absolute ethanol, and vacuum-dry to obtain white powdery unsaturated nano-silica monomer. Among them, the molar ratio of allyltrimethoxysilane and nano silicon dioxide is 1:1; (2) Polymerization reaction: methallyl polyoxyethylene ether with a molecular weight of 6026, methyl polyoxyethylene ether with a molecular weight of 1816 Add polyethylene glycol monomethyl ether acrylate and deionized water into the reaction kettle, heat and dissolve completely at 20-80°C to obtain solution A; add deionized aqueous solution of ammonium persulfate and acrylic acid dropwise to solution A at the same time 1. A mixed solution of ...

Embodiment 2

[0037] (1) Synthesis of unsaturated nano-silica monomer: use toluene dewatered by 3A molecular sieve as dispersant, add allyltriethoxysilane and nano-silica into the reaction kettle, and ultrasonically disperse for 10 minutes. Reflux at 80°C for 4 hours, cool to room temperature after the reaction, centrifuge at 13,000 rpm, wash the precipitate several times with absolute ethanol, and vacuum dry to obtain white powdery unsaturated nano-silica monomer. Wherein, the mol ratio of allyltriethoxysilane and nano silicon dioxide is 1:1;

[0038] (2) Polymerization reaction: Add methallyl polyoxyethylene ether with a molecular weight of 6026, polyethylene glycol monomethyl ether methacrylate with a molecular weight of 2036 and deionized water into the reactor. After heating and dissolving at ℃ temperature, A solution is obtained; in solution A, add the deionized aqueous solution of ammonium persulfate and the deionized water mixed solution of acrylic acid and unsaturated nano-silica m...

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Abstract

The invention discloses an organic-inorganic hybrid polycarboxylic water reducer. The structural formula of the organic-inorganic hybrid polycarboxylic water reducer is shown in the description, wherein R1 is H or -CH3, R2 is -CH2- or -COOCH2CH2CH2-, a, b, c, d, m and n are polymerization degrees and are positive integers respectively, a is 5-12, b is 1-5, c is 40-80, d is 1-3, m is 135-225, and nis 40-55. The invention also discloses a preparation method of the organic-inorganic hybrid polycarboxylic water reducer. Compared with the pure-organic polycarboxylic molecules, the organic-inorganic hybrid polycarboxylic water reducer with inorganic nano silicon dioxide particles not only has the characteristics of the organic polycarboxylic water reducer, but also has the size effects of inorganic particles, wherein the size effects include a steric hindrance effect, a ball effect and a filling effect; after addition of concrete, the water-retaining and slump-retaing properties are good, and after 120 minutes, the fluidity change of net paste is small, so that more benefit for early strength increase of the concrete is achieved.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to an organic-inorganic hybrid polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer, as the third generation of superplasticizer, has strong designability in molecular structure and great potential for high performance. It can prepare multifunctional products by selecting monomers with different functions for copolymerization. However, in recent years, the quality problems of cement, mineral admixtures, coarse aggregates, and fine aggregates have been serious. In addition, there are many types of cement in my country and various engineering mix ratios, which often lead to the incompatibility between polycarboxylate superplasticizer and concrete. Correspondingly, fresh concrete is prone to problems such as bleeding, segregation, and rapid collapse. Therefore, through molecular structure design, synthesis proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F230/08C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06C08F230/08
Inventor 高玉军李顺凯明阳王文荣韦鹏亮陈雍雍
Owner CCCC SHEC WUHAN PORT NEW MATERIALS