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Preparation method of anti-clay concrete admixture

A concrete admixture and admixture technology are applied in the preparation of clay-resistant concrete admixtures and the field of concrete admixture preparation

Active Publication Date: 2021-07-30
江苏金木土新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current anti-clay additives are mainly obtained by directly compounding inorganic / organic substances such as quaternary ammonium salts, phosphine-containing reagents, and polyethylene glycol. There is still relatively little research on how to organically combine the above-mentioned components with anti-clay effects.

Method used

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  • Preparation method of anti-clay concrete admixture

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preparation example Construction

[0039] A preparation method of an anti-clay concrete admixture, comprising the preparation of polyether-based glycidyl ether and the preparation of an anti-clay admixture, specifically comprising the following steps,

[0040] (1), preparation of polyether-based glycidyl ether

[0041] Firstly, the polyhydroxy initiator, alkylene oxide and catalyst are reacted under certain temperature and pressure conditions to make polyether polyol; then continue to add epichlorohydrin and react under certain temperature and pressure conditions to obtain polyether Glycidyl ether;

[0042] One of the structural formulas of the polyether-based glycidyl ether described in the above step (1) is shown in the following formula (1),

[0043]

[0044] in," "Represents polyether segment;

[0045] The synthesis process of the polyether-based glycidyl ether described in the above-mentioned step (1) is: in the airtight reaction kettle, add polyhydroxy initiator, polyethylene glycol monomethyl ethe...

Embodiment 1

[0069] Weigh 100.0 parts of sorbitol, 10.0 parts of polyethylene glycol monomethyl ether (Mn=400) as a solvent, and 0.15 parts of sodium hydroxide as a catalyst, and put them into a closed reaction kettle, replace with nitrogen for 3 times, then raise the temperature to 100°C, and pass them in sequence 1210.0 parts of ethylene oxide, 63.7 parts of propylene oxide, the reaction temperature is controlled between 100 ~ 130 ° C, the reaction pressure is controlled between 0.0 ~ 0.4 MPa, after the feeding is completed, the reaction is kept for 0.5 h ~ 1.0 h, and then the temperature is lowered to At 50°C, under the condition of -0.1MPa, the volatile components were distilled off under reduced pressure to obtain polyether polyol. The molecular weight of polyether polyol was 2450 by the hydroxyl value method.

[0070] Add 43.9 parts of sodium hydroxide to the above reaction kettle, replace with nitrogen for 3 times, then raise the temperature to 50°C, gradually add 122.0 parts of epic...

Embodiment 2

[0073] Weigh 100.0 parts of glycerol, 0.0 parts of polyethylene glycol monomethyl ether (Mn=400) as a solvent, and 0.2 parts of potassium hydroxide as a catalyst, put them into a closed reaction kettle, replace with nitrogen for 3 times, then raise the temperature to 100°C, and pass through Add 1,787.0 parts of ethylene oxide, 160.8 parts of glycidol, and 126.1 parts of isopropyl glycidyl ether. The reaction temperature is controlled between 100 and 130°C, and the reaction pressure is controlled between 0.0 and 0.4 MPa. 0.5h to 1.0h, then lower the temperature to 50°C, and distill off the volatile components under reduced pressure at -0.1MPa to obtain polyether polyol. The molecular weight of polyether polyol is 1986 according to the hydroxyl value method.

[0074] Add 121.7 parts of potassium hydroxide to the above reaction kettle, replace with nitrogen for 3 times, then raise the temperature to 60°C, gradually add 241.3 parts of epichlorohydrin, the pressure of the reaction k...

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Abstract

The invention discloses a preparation method of an anti-clay concrete admixture. The method comprises the preparation of polyether glycidyl ether and the preparation of the anti-clay admixture. The preparation of polyether glycidyl ether comprises the following steps: firstly, reacting a polyhydroxy initiator, alkylene oxide and a catalyst at a certain temperature and pressure to prepare polyether polyol; and then continuously adding epichlorohydrin, and performing reaction at a certain temperature and pressure to obtain the polyether glycidyl ether. The preparation method of the anti-clay admixture comprises the following steps: carrying out reaction on polyether glycidyl ether and a secondary amine monomer at a certain temperature and pressure to obtain tertiary amine polyether; and adding halogenated hydrocarbon into the tertiary amine polyether, and performing reaction at a certain temperature and pressure to obtain an anti-clay admixture finished product.

Description

technical field [0001] The invention relates to a method for preparing a concrete admixture, in particular to a method for preparing a clay-resistant concrete admixture, and belongs to the application field of concrete admixtures. Background technique [0002] Polycarboxylate superplasticizer is the third generation of high-performance superplasticizer, which has the characteristics of low dosage, high water reducing rate and good fluidity retention performance, and has been widely used in the concrete industry. With the increasing scarcity of high-quality natural sand and gravel aggregates, fly ash, slag and machine-made sand have been widely used in the concrete industry. On the one hand, these materials can improve the workability of concrete to a certain extent, on the other hand, the clay content and gradation control of these materials are insufficient, which leads to adaptability problems of polycarboxylate superplasticizers in concrete, and affects the working perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C08G65/337C08G65/333C04B24/32
CPCC08G65/2609C08G65/2606C08G65/2612C08G65/337C08G65/33306C04B24/32C04B40/0039C04B2103/302
Inventor 范士敏张磊牟忠江刘江
Owner 江苏金木土新材料有限公司
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