Preparation method of fatty group water reducing agent with high water-reducing rate

An aliphatic water reducing agent and high water reducing rate technology, which is applied in the field of building materials and can solve problems such as low water reducing rate

An aliphatic water reducing agent and high water reducing rate technology, which is applied in the field of building materials and can solve problems such as low water reducing rate

CN103467686AActive Publication Date: 2013-12-25科之杰新材料集团河南有限公司
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) In parts by mass, add 15 parts of sodium dithionite, 30 parts of formaldehyde and 60 parts of water into reaction kettle A, stir to dissolve, and when the temperature is controlled at 25°C, add 20 parts of acetone at one time and continue the reaction for 1 hour. Then add 5 parts of citric acid and 1 part of hydrogenated rosin to obtain the mixed liquid I.

[0018] (2) Also in parts by mass, 20 parts of acetone and 10 parts of cyclohexanone were prepared to form a mixed solution II.

[0019] (3) In parts by mass, add 45 parts of sodium bisulfite, 15 parts of sodium hydroxide and 60 parts of water to the reaction kettle B, control the reaction temperature at 50°C, quickly drop the mixed solution II, and drop it within 0.5 hours Finished adding. After the dropwise addition, keep warm for 0.5h. After the heat preservation is over, the mixed solution I is added dropwise, and the dropwise addition is completed within 1.5 hours. After the mixture I was added dropwise, ...

Embodiment 2

[0022] (1) In parts by mass, add 30 parts of sodium sulfite, 60 parts of formaldehyde and 60 parts of water into reaction kettle A, stir to dissolve, and when the temperature is controlled at 30°C, add 15 parts of acetone at one time, and continue the reaction for 1 hour. Then add 3 parts of citric acid and 3 parts of hydrogenated rosin to obtain mixed liquid I.

[0023] (2) Mix 30 parts of acetone and 10 parts of cyclohexanone to form a mixture II.

[0024] (3) In reactor B, add 40 parts of sodium bisulfite, 10 parts of potassium hydroxide and 60 parts of water, control the reaction temperature at 60°C, quickly add the mixed solution II dropwise, and complete the dropwise addition within 0.5 hours. After the dropwise addition, keep warm for 0.5h. After the heat preservation is over, the mixed solution I is added dropwise, and the dropwise addition is completed within 1.5 hours. After the dropwise addition of the mixed solution I is completed, 1 part of sodium persulfate is ...

Embodiment 3

[0026] (1) In parts by mass, add 25 parts of sodium bisulfite, 50 parts of formaldehyde and 60 parts of water into reaction kettle A, stir and dissolve, and when the temperature is controlled at 25°C, add 10 parts of acetone at one time, and continue the reaction for 1 hour . Then add 2 parts of citric acid and 5 parts of hydrogenated rosin to obtain the mixed liquid I.

[0027] (2) Mix 40 parts of acetone and 5 parts of cyclohexanone to form a mixture II.

[0028] (3) In reactor B, add 30 parts of sodium bisulfite, 30 parts of triethanolamine and 60 parts of water, control the reaction temperature at 40°C, quickly add the mixed solution II dropwise, and complete the dropwise addition within 0.5 hours. After the dropwise addition, keep warm for 0.5h. After the heat preservation is over, the mixed solution I is added dropwise, and the dropwise addition is completed within 1.5 hours. After the mixture I was added dropwise, 2 parts of ammonium persulfate were added, and the re...

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Abstract

The invention discloses a preparation method of a fatty group water reducing agent with high water-reducing rate. The method comprises the following steps: adopting a low sulfonation degree formaldehyde-acetone prepolymerized sulfonating compound prepared at low temperature; adopting an acetone-cyclohexanone presulfonates compound sulfonated at medium temperature; automatically increasing the reaction temperature through the control of material dropwise adding sequence and speed, and carrying out aldol reaction at the high temperature at the last stage of the reaction; initiating free radical polymerization through adding slight persulfate salt, and improving the molecular weight of the product. Through the adoption of the implementation manner, the fatty group water reducing agent with high water-reducing rate can be obtained.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of an aliphatic water reducer with a high water reducing rate. Background technique [0002] Aliphatic water reducers, like other types of water reducers, can greatly increase the fluidity of concrete mixtures, or greatly reduce the water consumption of concrete mixtures while maintaining the same fluidity. The amount of water agent is the second largest category after naphthalene series, and it has a wide range of uses. Under the action of electrostatic repulsion, the aliphatic water reducer can destroy the agglomeration of cement particles in concrete, so that the cement particles are in a dispersed state. The stronger polar groups on the molecular side chains are easy to associate with water molecules, forming a stable hydration film on the surface of cement particles, preventing the mutual agglomeration of cement particles and main...

Claims

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Application Information

Patent Timeline
25 Dec 2013
Publication
CN103467686A
IPC
C08G16/04; C04B24/16; C04B103/30
Inventors
方云辉; 赖华珍