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High-reduction modified aliphatic water reducing agent and preparation method thereof

An aliphatic water-reducing agent and water-reducing type technology, applied in the field of water-reducing agents, can solve the problems of general slump retention performance and adaptability, increase the cost of aliphatic water-reducing agents, and cannot meet the requirements of high performance, etc. Improve steric hindrance effect, high water reduction effect, good adaptability effect

Active Publication Date: 2013-01-30
广东红球建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the price of sulfite continues to rise, the cost of aliphatic water reducers has also increased. In addition, its water reducing rate is slightly higher than that of naphthalene series, and its slump retention performance and adaptability are average, which cannot meet the requirements. requirements for its high performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A high water-reducing modified aliphatic water-reducing agent is prepared according to the following steps:

[0035] First, add 12 parts of water, 8 parts of sodium metabisulfite, 5 parts of liquid caustic soda, and 2 parts of sodium lignosulfonate dispersant into the reaction vessel, heat up, add 5 parts of acetone at a temperature of 50 ° C, and stir for 40 min; Then add 20 parts of formaldehyde solution dropwise, control the dropping speed, and complete the dropwise addition in 2 hours; finally add 3 parts of allyl alcohol polyoxyethylene ether active agent, raise the temperature to 80°C, and polymerize for 4 hours to obtain a high water-reducing type Modified aliphatic water reducer.

Embodiment 2

[0037] A high water-reducing modified aliphatic water-reducing agent is prepared according to the following steps:

[0038] First add 7 parts of water, 6 parts of sodium metabisulfite, 3 parts of liquid caustic soda, and 1 part of sodium lignosulfonate dispersant into the reaction vessel, heat up, add 3 parts of acetone at a temperature of 30°C, and stir for 35 minutes; Then add 10 parts of formaldehyde solution dropwise, control the dropping speed, and complete the dropwise addition within 1 h; finally add 1 part of allyl alcohol polyoxyethylene ether active agent, raise the temperature to 90 ° C, and polymerize for 3 h to obtain a high water-reducing type Modified aliphatic water reducer.

Embodiment 3

[0040] A high water-reducing modified aliphatic water-reducing agent is prepared according to the following steps:

[0041] First, add 18 parts of water, 10 parts of sodium pyrosulfite, 10 parts of liquid caustic soda, and 3 parts of sodium lignosulfonate dispersant into the reaction vessel, heat and raise the temperature, add 6 parts of acetone at a temperature of 40°C, and stir for 30 min; Then add 32 parts of formaldehyde solution dropwise, control the dropping speed, and complete the dropwise addition in 3 hours; finally add 5 parts of allyl alcohol polyoxyethylene ether active agent, heat up to 100°C, and polymerize for 2 hours to obtain a high water-reducing type Modified aliphatic water reducer.

[0042] In the present invention, cheap pyrosulfite is used to replace high-priced sulfite, and at the same time, some other cheap raw materials are used to participate in the synthesis reaction, which effectively reduces the cost of the water reducer. The invention uses an ac...

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Abstract

The invention discloses a high-reduction modified aliphatic water reducing agent and a preparation method thereof. The water reducing agent is prepared from the following raw materials in parts by weight: pyrosulfite, ketone compound, aldehyde compound, dispersant, active agent, liquid alkali and water. The preparation method comprises the following steps of: adding the water, the pyrosulfite, the liquid alkali and the dispersant into a reaction container, heating, adding the ketone compound at the temperature of between 30 and 50 DEG C, and stirring; dripping a solution of the aldehyde compound for 1 to 3 hours, and controlling the dripping speed; and finally adding the active agent, heating to the temperature of between 80 and 100 DEG C, and performing polymerization reaction for 2 to 4 hours. The cheap pyrosulfite is used for replacing expensive sulfite, and a part of other cheap raw materials are used for the synthetic reaction, so the cost of the water reducing agent is effectively reduced; and by using the active agent containing a long side chain, the stereo-hindrance effect is improved, and the synthesized water reducing agent has a high water reducing effect and is high in adaptability.

Description

technical field [0001] The invention relates to the field of water-reducing agents, in particular to a high-water-reducing modified aliphatic water-reducing agent and a preparation method thereof. Background technique [0002] With the development of concrete technology, high-efficiency water reducer has become the most important component of concrete admixture. At present, in the domestic admixture market, high-efficiency water reducers are mainly based on naphthalene series and polycarboxylic acid. However, naphthalene-based superplasticizers are limited by their structure and cannot fundamentally improve the slump performance of concrete; although polycarboxylate superplasticizers have excellent slump performance and good adaptability to cement, their application range is limited due to their high price. limits. [0003] Aliphatic water reducer is a new type of water reducer developed in the 1980s. It is an anionic polymer surfactant prepared by sulfonation and condens...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B103/30
Inventor 徐友娟
Owner 广东红球建材科技有限公司
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