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A kind of preparation method of collapsible polycarboxylate water reducer

A technology of slump-preserving polycarboxylic acid and water-reducing agent, applied in the field of concrete admixtures, can solve the problems of poor slump-preserving effect of polycarboxylate water-reducing agent, achieve controllable reaction rate, reduce transportation cost, and reduce production cost Effect

Active Publication Date: 2021-01-15
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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  • A kind of preparation method of collapsible polycarboxylate water reducer
  • A kind of preparation method of collapsible polycarboxylate water reducer
  • A kind of preparation method of collapsible polycarboxylate water reducer

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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 collapse-preserving polycarboxylate water-reducer, which is prepared by bulk polymerization, which specifically includes the following steps: (1) polyoxyethylene polyoxypropylene Mix the ether and polyoxyethylene ether, control the temperature to 40-60°C, stir evenly, then add the initiator, and the mixture of unsaturated carboxylic acid, unsaturated carboxylic acid ester and chain transfer agent; (2) the step (1 ) after the completion of aging for 0.5 to 1 hour, lowering the temperature to obtain a slump-preserving polycarboxylate superplasticizer. The bulk polymerization reaction is carried out at a relatively low temperature, the conditions are mild, and the operability is strong. The synthesized polycarboxylate water reducer has high water reducing performance. The polycarboxylate water reducer prepared by the above method is liquid at normal temperature, the effective concentration is 100%, the storage performance is stable, and it is suitable for long-distance transportation and use; The problem of concrete collapse caused by long transportation time has broad prospects for industrial application.

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 Patents(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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