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Aliphatic series high-efficiency water reducing agent and preparation method thereof

A high-efficiency water-reducing agent, aliphatic technology, applied in the preparation of sulfonates, organic chemistry, etc., can solve the problems of long reaction period and uneven molecular weight distribution of reaction products, achieve stable reaction, avoid bumping and gelling phenomenon , the effect of a significant increase in strength

Inactive Publication Date: 2010-01-13
江苏汇迪建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the above-mentioned defects, the technical problem to be solved in the present invention is to provide an aliphatic high-efficiency water reducer and its preparation method in view of the problems of long reaction period and uneven molecular weight distribution of the reaction product in the existing sodium sulfite preparation process

Method used

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  • Aliphatic series high-efficiency water reducing agent and preparation method thereof
  • Aliphatic series high-efficiency water reducing agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Raw material weight ratio is

[0028] Anhydrous sodium sulfite: 15.5%

[0029] Acetone: 13%

[0030] Mass concentration 37% formaldehyde solution: 32%

[0031] Water: 39.5%;

[0032] The specific operation process is as follows:

[0033] Add water and anhydrous sodium sulfite into the reaction vessel, add acetone and stir under reflux for 30 minutes at a temperature below 20°C, add formaldehyde solution with a mass concentration of 37% into the reaction vessel dropwise, control the dripping reverse speed to complete the dropwise addition in 2 hours, and then heat Raise the temperature to 80° C., and react at constant temperature for 3 hours to obtain a brown-red liquid finished aliphatic high-efficiency water reducer with a mass concentration of 35%.

Embodiment 2

[0035] Raw material weight ratio is

[0036] Anhydrous sodium sulfite: 5%

[0037] Acetone: 13%

[0038] Mass concentration 37% formaldehyde solution: 32%

[0039] Water: 50%;

[0040] The specific operation process is as follows:

[0041] Add water and sodium sulfite into the reaction vessel, add acetone at a temperature below 40°C, stir and reflux for 60 minutes, add the formaldehyde solution with a mass concentration of 37% dropwise into the reaction vessel of the first step, and control the reverse speed of the dropping to complete the dropwise addition in 1 hour. Then heat up to 120° C. and react at constant temperature for 6 hours to obtain a brown-red liquid finished aliphatic high-efficiency water reducer with a mass concentration of 40%.

Embodiment 3

[0043] Anhydrous sodium sulfite: 17.58%

[0044] Acetone: 9.89%

[0045] 37% formaldehyde solution with mass concentration: 28.57%

[0046] Water: 43.96%,

[0047] The specific operation process is as follows:

[0048] Add water and anhydrous sodium sulfite into the reaction vessel, add acetone and stir under reflux for 30 minutes at a temperature below 20°C, add formaldehyde solution with a mass concentration of 37% into the reaction vessel dropwise, control the dripping reverse speed to complete the dropwise addition in 2 hours, and then heat Raise the temperature to 80° C., and react at constant temperature for 3 hours to obtain a brown-red liquid finished aliphatic high-efficiency water reducer with a mass concentration of 35%.

[0049] The main technical performance index of the product prepared by the present invention is as follows:

[0050] 1. Brown-red liquid in appearance; solid content > 30%; specific gravity 1.15-1.2

[0051] 2. High water reduction rate. The...

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Abstract

The invention relates to an aliphatic series high-efficiency water reducing agent and a preparation method thereof, belonging to the technical field of water reducing agent for concrete. The aliphatic series high-efficiency water reducing agent is characterized in that the structure of the aliphatic series high-efficiency water reducing agent is shown as the upper formula, wherein a, b, c and d are positive integers and larger than or equal to 80, but less than or equal to 200; water and sodium sulfite are added into a reaction container, acetone is added into the reaction container to be stirred and reflowed for 30-60 minutes under the temperature below 20-40 DEG C, a formaldehyde solution with the mass concentration of 37 percent is dripped into the reaction container in the first step, the contrary dripping speed is controlled to complete dripping within1-2 hours, and then the mixture is heated to increase the temperature to 80-120 DEG C and reacted under constant temperature for 3-6 hours so as to obtain a brownish red liquid finished product with the mass concentration of 30-40 percent, namely, the aliphatic series high-efficiency water reducing agent. The invention solves the problems of long reaction period and the nonuniform molecular weight distribution of reaction products in the preparation process of the prior sodium sulfite.

Description

technical field [0001] The invention relates to the water reducer technology for concrete, in particular to an aliphatic high-efficiency water reducer and a preparation method thereof. Background technique [0002] As one of the important components of concrete, admixtures, especially superplasticizers, play an extremely important role in concrete materials. At present, in the application of domestic water reducers, there are naphthalene-based high-efficiency water-reducers as the mainstream, and high-efficiency water-reducers such as melamine resin, sulfamate, aliphatic and modified lignin are developed together. Polycarboxylate high-performance water reducer is gradually in-depth research and preliminary application as the direction of the trend. However, there are still many problems in the application of various high-efficiency water reducers: in addition to the high alkali content of naphthalene-based water reducers and its addition, freshly mixed concrete is prone to ...

Claims

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Application Information

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IPC IPC(8): C04B24/16C07C309/20C07C303/32C04B103/30
Inventor 胡华强李华威谈伟明
Owner 江苏汇迪建材有限公司
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