Ether polycarboxylate superplasticizer and preparation method thereof

A technology of ether polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve the problems of time-consuming and energy-consuming, slump loss over time, reducing production efficiency, etc., and meet the requirements of reducing energy consumption, production equipment and conditions Low, the effect of improving production efficiency

Inactive Publication Date: 2015-01-07
XIAMEN TIANRUN JINLONG BUILDING MATERIAL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process requires an external heat source, and there is also the problem of excessive loss of slump over time
[0005] CN103508696A discloses a polycarboxylic acid anti-mud superplasticizer and its preparation method. The dropping temperature during reaction is 35-45°C, and the

Method used

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  • Ether polycarboxylate superplasticizer and preparation method thereof
  • Ether polycarboxylate superplasticizer and preparation method thereof
  • Ether polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 100 g of isopentenyl polyoxyethylene ether with a molecular weight of 3000, 4 g of hydrogen peroxide and 95 g of water into a four-neck flask, start the stirring device, and stir until completely dissolved. 0.2g of sodium bisulfite, 0.3g of mercaptoacetic acid and 32g of water are made into a reducing agent and a chain transfer agent composite aqueous solution, and 10g of acrylic acid, 2g of dimethylaminoethyl acrylate, 1g of diethylaminoethyl methacrylate and 29g of water was prepared into an unsaturated acid solution, and the two aqueous solutions were mixed evenly for later use. Under the normal temperature system, add the composite aqueous solution of the reducing agent and the chain transfer agent and the unsaturated acid solution dropwise into the four-neck flask. The dropwise addition time is 2 hours, and keep warm for 1 hour after the dropwise addition is completed. After the heat preservation is completed, adjust the pH value with 12 g of 32% mass concentra...

Embodiment 2

[0029] Add 100 g of isopentenyl polyoxyethylene ether with a molecular weight of 3000, 0.8 g of ammonium persulfate and 95 g of water into a four-neck flask, start the stirring device, and stir until completely dissolved. 0.1g of sodium bisulfite, 0.25g of sodium sulfite, 0.3g of mercaptoacetic acid and 32g of water are made into a complex aqueous solution of reducing agent and chain transfer agent, and 10g of acrylic acid, 2g of dimethylaminoethyl acrylate and 29g of water are made into an unsaturated The acid solution and the two aqueous solutions were mixed evenly for later use. Under the normal temperature system, add the composite aqueous solution of the reducing agent and the chain transfer agent and the unsaturated acid solution dropwise into the four-neck flask. The dropwise addition time is 2 hours, and keep warm for 1 hour after the dropwise addition is completed. After the heat preservation is completed, adjust the pH value with 10 g of a 32% mass concentration sodi...

Embodiment 3

[0031] Add 100 g of methallyl polyoxyethylene ether with a molecular weight of 3000, 3.5 g of hydrogen peroxide and 93 g of water into a four-neck flask, start the stirring device, and stir until completely dissolved. 0.15g of sodium bisulfite, 0.1g of sodium metabisulfite, 0.6g of mercaptopropionic acid and 32g of water are made into a complex aqueous solution of reducing agent and chain transfer agent, and 9g of acrylic acid, 2g of lauryl acrylate and 29g of water are made into an unsaturated acid solution, the two aqueous solutions were mixed evenly for later use. Under the normal temperature system, add the composite aqueous solution of the reducing agent and the chain transfer agent and the unsaturated acid solution dropwise into the four-neck flask. The dropwise addition time is 2 hours, and keep warm for 1 hour after the dropwise addition is completed. After the heat preservation is completed, adjust the pH value with 10 g of a 32% mass concentration sodium hydroxide so...

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Abstract

The invention discloses an ether polycarboxylate superplasticizer and a preparation method thereof. The ether polycarboxylate superplasticizer is prepared from the following components in parts by weight: 100 parts of modified polyether monomer having the molecular weight in the range of 3000 to 3500, 6-17 parts of unsaturated acid, 0.3-5.0 parts of oxidizing agent, 0.1-1.0 part of reducing agent, 0.3-1.0 part of chain transfer agent, 6-14 parts of sodium hydroxide having the mass concentration of 32% and 90-200 parts of water. The preparation method of the ether polycarboxylate superplasticizer has the advantages that the temperature of the system rises when the oxidizing agent is added once, and in the later period, the temperature of the system also rises due to heat released by polymerization when the unsaturated acid solution and the composite solution of the reducing agent and the chain transfer agent are added dropwise; and in other words, the preparation method is capable of realizing spontaneous heating, and is relatively low in requirements on the equipment and the conditions of industrial production, capable of reducing the energy consumption and improving the production efficiency during production, and economic and environment-friendly. The modified polyether monomer having the molecular weight in the range of 3000 to 3500 is adopted for the ether polycarboxylate superplasticizer so that the length of the side chain is increased, and therefore, the early hydration of a cement dispersion system can be increased and the slump retaining property of the cement dispersion system can be improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ether polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizers on the market today are mainly divided into two types: esters and ethers. The synthesis process of esters is relatively complicated, while ether products use a one-step synthesis method. Because of their relatively simple process, they occupy a large market share. Larger proportional share. [0003] In the application process of commercial concrete, one of the most common and main problems is the loss of concrete slump, especially for pumped concrete. This problem is more prominent in high temperature and hot weather conditions. At present, the industry mainly solves the problem of concrete slump damage through methods such as post-mixing of water reducing agents, combined use with retarders, and lowering the concrete exi...

Claims

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Application Information

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IPC IPC(8): C04B24/32C08F283/06C08F2/38
Inventor 陈小路方云辉蒋卓君张小芳官梦芹
Owner XIAMEN TIANRUN JINLONG BUILDING MATERIAL
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