Method for preparing viscosity-reducing polycarboxylate superplasticizer

A viscous polycarboxylic acid and water reducing agent technology, which is applied in the field of concrete admixtures, can solve problems such as the inability to effectively reduce the viscosity of concrete mixtures, and achieve the effects of controllable reaction rate, reduced production cost and stable performance.

Active Publication Date: 2018-05-08
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 problem that the polycarboxylate water reducer in the prior art cannot effectively reduce the viscosity of the concrete mixture

Method used

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  • Method for preparing viscosity-reducing polycarboxylate superplasticizer
  • Method for preparing viscosity-reducing polycarboxylate superplasticizer
  • Method for preparing viscosity-reducing polycarboxylate superplasticizer

Examples

Experimental program
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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 85 g of prenol and 0.15 g of KOH into the reaction kettle, and replace the air in the kettle with nitrogen.

[0042] (2) When the temperature of the kettle rises to 100-110°C, start to feed 1650g of ethylene oxide and 350g of propylene oxide, keep the polymerization reaction temperature at 130°C, and the reaction pressure at 0.15Mpa. The reaction product of pentenyl polyoxyethylene polyoxypropylene ether.

[0043] (3) neutralize the above-mentioned reaction product, and then degas in the reactor to obtain m=15, n=20, isopentenyl polyoxyethylene polyoxypropylene ether with an average molecular weight of 1892.38.

[0044] 2. Preparation of polycarboxylate water reducer

[0045] (1) In a four-necked flask, add 200 g of isopentenyl polyoxyethylene polyo...

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 90 g of isobutenol and 0.20 g of KOH into the reaction kettle, and replace the air in the kettle with nitrogen.

[0053] (2) When the temperature of the kettle rises to 100°C, 1250g of ethylene oxide and 450g of propylene oxide are introduced into the reactor to keep the polymerization reaction temperature at 130°C and the reaction pressure at 0.20Mpa. The reaction product of oxyethylene polyoxypropylene ether.

[0054] (3) neutralize the above-mentioned reaction product, then degas in the reactor to obtain m=30, n=3, isobutenyl polyoxyethylene polyoxypropylene ether with an average molecular weight of 1551.8.

[0055] 2. Preparation of polycarboxylate water reducer

[0056] (1) In a four-necked flask, add 150 g of isobutylene polyoxyethylene ...

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 100 g of prenol and 0.30 g of KOH 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 feeding 1395g of ethylene oxide and 1300g of propylene oxide, keep the polymerization reaction temperature at 100-110°C, and the reaction pressure at 0.35Mpa. After 3 hours of aging, the obtained Reaction product of isopentenyl polyoxyethylene polyoxypropylene ether.

[0065] (3) neutralize the above-mentioned reaction product, then degas in the reactor to obtain m=35, n=10, isopentenyl polyoxyethylene polyoxypropylene ether with an average molecular weight of 2192.62.

[0066] 2. Preparation of polycarboxylate water reducer

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

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Abstract

The invention provides a method for preparing viscosity-reducing polycarboxylate superplasticizer. The viscosity-reducing polycarboxylate superplasticizer is prepared through a bulk polymerization reaction, and the method comprises the following steps of: (1) mixing polyoxyethylene polyoxypropylene ether and polyoxyethylene ether, controlling the temperature at 40-60 DEG C, stirring the mixture evenly, and then adding an initiator and a mixture of unsaturated carboxylic acids, hydroxyalkyl unsaturated carboxylate and a chain transfer agent; and (2) performing aging for 1-1.5 hours after the step (1) is completed, and reducing the temperature to obtain the viscosity-reducing polycarboxylate superplasticizer. Since the bulk polymerization reaction is carried out at a low temperature, the method has strong operability, mild conditions and low energy consumption; the viscosity-reducing polycarboxylate superplasticizer prepared by using the method is at a liquid state at room temperature, has effective concentration of 100% and stable storage performance, and is suitable for long-distance transportation and use; meanwhile, the viscosity of a concrete mixture can be reduced effectively through the superplasticizer so that stirring, transportation and pumping of concrete can be facilitated, and the superplasticizer is suitable for the promotion and application of high-rise engineeringand high-performance concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a viscosity-reducing 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, electrostat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F222/02C04B24/26C08F2/02C04B103/30
CPCC04B24/2694C04B2103/302C08F2/02C08F283/065C08F220/06C08F220/20C08F222/02
Inventor 何新耀李亚杰李玉博
Owner JIAHUA CHEM MAOMING
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