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Preparation method of slump-proof polycarboxylate superplasticizer

A technology of slump-preserving polycarboxylic acid and water-reducing agent, which is applied in the field of concrete admixtures, can solve the problems of poor slump-preserving effect of polycarboxylate water-reducing agent, and achieves the advantages of controllable reaction rate, stable performance and reduced production cost. Effect

Active Publication Date: 2018-05-29
JIAHUA CHEM MAOMING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the poor slump-preserving effect of polycarboxylate superplasticizers in the prior art

Method used

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  • Preparation method of slump-proof polycarboxylate superplasticizer
  • Preparation method of slump-proof polycarboxylate superplasticizer
  • Preparation method of slump-proof polycarboxylate superplasticizer

Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment provides a synthetic method of polycarboxylate water reducer, which specifically includes the following steps:

[0040] 1. Preparation of isopentenyl polyoxyethylene polyoxypropylene ether

[0041] (1) Add 125 g of isopentenol and 0.35 g of KOH alkali catalyst into the reaction kettle, and replace the air in the kettle with nitrogen.

[0042] (2) When the temperature of the kettle rises to 100°C, start feeding 2325g of ethylene oxide and 1450g 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.

[0043] (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.

[0044] 2. Preparation of polycarboxylate water reducer

[0045] (1) In a four-necked flask, add 250 g of isopentenyl polyoxyethylene...

Embodiment 2

[0050] This embodiment provides a synthetic method of polycarboxylate water reducer, which specifically includes the following steps:

[0051] 1. Preparation of isobutylene-based polyoxyethylene polyoxypropylene ether

[0052] (1) Add 100 g of isobutenol and 0.25 g of KOH base catalyst into a 2L reaction kettle, and replace the air in the kettle with nitrogen.

[0053] (2) When the temperature of the kettle rises to 100-110°C, start to feed 1620g of ethylene oxide and 935g of propylene oxide, keep the polymerization reaction temperature at 100°C, and the reaction pressure at 0.25Mpa. After 3 hours of aging, the isobutylene-containing The reaction product of polyoxyethylene polyoxypropylene ether.

[0054] (3) neutralize the above-mentioned reaction product, then degas in the reactor to obtain m=42, n=5, isobutylene-based polyoxyethylene polyoxypropylene ether with an average molecular weight of 2210.58.

[0055] 2. Preparation of polycarboxylate water reducer

[0056] (1) I...

Embodiment 3

[0061] This embodiment provides a synthetic method of polycarboxylate water reducer, which specifically includes the following steps:

[0062] 1. Preparation of isopentenyl polyoxyethylene polyoxypropylene ether

[0063] (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.

[0064] (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 125°C, and the reaction pressure at 0.35Mpa. The reaction product of pentenyl polyoxyethylene polyoxypropylene ether.

[0065] (3) neutralize the above-mentioned reaction product, and then degas in the reactor to obtain m=48, n=17, isopentenyl polyoxyethylene polyoxypropylene ether with an average molecular weight of 3171.8.

[0066] 2. Preparation of polycarboxylate water reducer

[0067] (1) In a four-necked flask, add 270 g of isopent...

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Abstract

The invention provides a preparation method of a slump-proof polycarboxylate superplasticizer. The slump-proof polycarboxylate superplasticizer is prepared by bulk polymerization. The preparation method comprises the steps of (1) mixing polyoxyethylene polyoxypropylene ether and polyoxyethylene ether, stirring well at controlled temperature of 40-60 DEG C, and adding an initiator and a mixture ofunsaturated carboxylic acid, unsaturated carboxylates and a chain transfer agent; (2) curing for 0.5-1 hour after completion of step (1), and cooling to obtain the slump-proof polycarboxylate superplasticizer. The bulk polymerization is performed at relatively low temperature, the conditions are mild, operability is high, and the synthesized polycarboxylate superplasticizer has high water-reducingproperty. The polycarboxylate superplasticizer prepared herein is in liquid state at normal temperature, having an effective concentration of 100% and good stability of storage performance; the polycarboxylate superplasticizer is applicable to long-range transport and use; the polycarboxylate superplasticizer has excellent slump-proof performance; the problem can be solved that concrete slumps due to high temperature and long transport time; the polycarboxylate superplasticizer has a promising industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a slump-preserving polycarboxylate water reducer. Background technique [0002] Concrete has become the foundation of human life and is currently the most widely used building material. Concrete admixture is the fifth component in concrete besides cement, sand, stone and water, and plays a very important role in the application of high performance concrete. As a kind of concrete admixture, water reducing agent (also known as superplasticizer, Superplasticizer) can reduce mixing water consumption and improve concrete strength under the condition of concrete workability and cement dosage unchanged, and has become the field of concrete admixture Research hotspots and development priorities. The water reducing agent hinders or destroys the flocculation structure of cement particles through surface activity, complexation, electrostatic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C08F220/18C08F2/02C08F2/38C04B24/26C04B103/30
CPCC04B24/2694C08F2/02C08F2/38C08F283/065C04B2103/302C08F220/1803C08F220/1802
Inventor 何新耀刘媛李亚杰李玉博
Owner JIAHUA CHEM MAOMING
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