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A kind of preparation method of liquid polycarboxylate water reducer

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete admixtures, can solve the problems of inability to react and synthesize, and achieve the effects of controllable reaction rate, simplified synthesis process, and avoiding detonation

Active Publication Date: 2021-03-16
JIAHUA CHEM MAOMING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved in the present invention is to overcome the polycarboxylate superplasticizer that cannot be synthesized through bulk polymerization in the prior art with an effective concentration of 100% and is liquid at room temperature.

Method used

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  • A kind of preparation method of liquid polycarboxylate water reducer
  • A kind of preparation method of liquid polycarboxylate water reducer
  • A kind of preparation method of liquid polycarboxylate water reducer

Examples

Experimental program
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Effect test

Embodiment 1

[0036] This embodiment provides a synthetic method of polycarboxylate water reducer, which specifically includes the following steps:

[0037] 1. Preparation of isopentenyl polyoxyethylene polyoxypropylene ether

[0038] (1) Add 60 g of prenol and 0.25 g of NaOH to the reaction kettle, and replace the air in the kettle with nitrogen.

[0039] (2) When the temperature of the kettle rises to 110°C, start to feed 1116g of ethylene oxide and 840g of propylene oxide, keep the polymerization reaction temperature at 130°C, and the reaction pressure at 0.35Mpa. The reaction product of polyoxyethylene polyoxypropylene ether.

[0040] (3) neutralize the above-mentioned reaction product, then degas in the reactor to obtain m=30, n=20, isopentenyl polyoxyethylene polyoxypropylene ether with an average molecular weight of 2553.16.

[0041] 2. Preparation of polycarboxylate water reducer

[0042] (1) Put 270 g of isopentenyl polyoxyethylene polyoxypropylene ether (m=30, n=20, average molec...

Embodiment 2

[0046] This embodiment provides a synthetic method of polycarboxylate water reducer, which specifically includes the following steps:

[0047] 1. Preparation of isobutylene-based polyoxyethylene polyoxypropylene ether

[0048] (1) Add 85 g of isopentenol and 0.35 g of KOH as an alkali catalyst into the reaction kettle, and replace the air in the kettle with nitrogen.

[0049] (2) When the temperature of the kettle rises to 100-110°C, start to feed 2440g of ethylene oxide and 800g of propylene oxide, keep the polymerization reaction temperature at 100-110°C, and the reaction pressure at 0.35Mpa. After aging for 3 hours, the obtained Reaction product of isopentenyl polyoxyethylene polyoxypropylene ether.

[0050] (3) neutralize the above-mentioned reaction product, then degas in the reactor to obtain m=51, n=15, isopentenyl polyoxyethylene polyoxypropylene ether with an average molecular weight of 3173.85.

[0051] 2. Preparation of polycarboxylate water reducer

[0052] (1) ...

Embodiment 3

[0056] This embodiment provides a synthetic method of polycarboxylate water reducer, which specifically includes the following steps:

[0057] 1. Preparation of isobutylene-based polyoxyethylene polyoxypropylene ether

[0058] (1) Add 86 g of isobutenol and 0.25 g of alkali catalyst NaOH into the reaction kettle, and replace the air in the kettle with nitrogen.

[0059] (2) When the temperature of the kettle rises to 100°C, 1720g of ethylene oxide and 830g of propylene oxide are introduced into the reactor, the polymerization temperature is kept at 100°C, and the reaction pressure is 0.25Mpa. The reaction product of oxyethylene polyoxypropylene ether.

[0060] (3) neutralize the above-mentioned reaction product, then degas in the reactor to obtain m=60, n=1, isobutylene-based polyoxyethylene polyoxypropylene ether with an average molecular weight of 2757.2.

[0061] 2. Preparation of polycarboxylate water reducer

[0062] (1) In the four-necked flask, add 280 g of isobutyle...

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Abstract

The invention provides a preparation method of liquid polycarboxylate superplasticizer. Through a main body polymerization reaction, the polycarboxylate superplasticizer is prepared. The preparation method includes steps of (1), mixing polyoxyethylene polyoxypropylene ether and polyoxyethylene ether, and controlling temperature at 40-60 DEG C; stirring evenly and then adding initiator and mixtureof unsaturated carboxylic acid and chain transfer agent; (2), curing for 0.5-1 hour after completing step (1), cooling to obtain collapse-preventing type polycarboxylate superplasticizer. The main body polymerization reaction is carried out under a relative low temperature, the operability is strong, the condition is gentle, and the energy consumption is low; the preparation method is applied to compound polycarboxylate superplasticizer with excellent performance; the polycarboxylate superplasticizer prepared by the method is liquid state under the room temperature, the effective concentrationis up to 100%; the storage performance is stable, and the liquid polycarboxylate superplasticizer is suitable for long-distance transportation and use, thereby bringing good construction condition for concrete construction.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a liquid polycarboxylate water reducer. Background technique [0002] Concrete has become the foundation of human life and is currently the most widely used building material. The admixture is the fifth component in concrete besides cementitious materials, sand, stone, and water. The research and development of admixture plays an important role in promoting the development of concrete technology. [0003] Water reducer (also known as superplasticizer, Superplasticizer) is the most used concrete admixture, its main function is to hinder or destroy cement through surface activity, complexation, electrostatic repulsion or three-dimensional repulsion, etc. The flocculation structure of the particles can greatly improve the workability and fluidity of the concrete, so as to save the amount of cement, reduce the water consumption of conc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C04B24/26C04B103/30
CPCC04B24/2605C04B24/267C04B2103/302C08F283/065C08F220/06C08F222/02
Inventor 何新耀刘媛李玉博
Owner JIAHUA CHEM MAOMING
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