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A kind of sulfonated melamine formaldehyde resin water reducing agent and preparation method thereof

A technology for sulfonating melamine and formaldehyde resin, applied in the field of resin, can solve the problems of reduced water reducing rate of resin water reducing agent, unstable resin performance, poor fluidity and dispersibility, etc., and achieves obvious early strength effect and improved sulfonation rate. , the effect of molecular weight stability

Active Publication Date: 2016-02-03
SHANDONG ZHANHUA OSITER CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current synthesis process itself has the following problems: (1) It is difficult to control the molecular weight of the reaction, and it is difficult to accurately control the molecular weight of the reaction product during the reaction; (2) The stability of the resin is poor, and the performance of the obtained resin is unstable. During the process, the water reducing rate of the resin water reducing agent is greatly reduced; (3) Poor adaptability to cement in concrete application, poor fluidity and dispersion in cement static slurry, which affects the performance of cement

Method used

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  • A kind of sulfonated melamine formaldehyde resin water reducing agent and preparation method thereof

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Embodiment 1

[0013] The sulfonated melamine formaldehyde resin water reducer comprises the following raw materials: melamine, liquid formaldehyde and water, wherein the weight ratio of melamine, liquid formaldehyde and water is 10:25:7.

[0014] The preparation method of the sulfonated melamine formaldehyde resin water reducer comprises the following steps: firstly mix melamine, liquid formaldehyde and water in a weight ratio of 10:25:7 to obtain a mixture, and then adjust the pH value to 9.0, heat up to 40°C, keep warm and react for 60 minutes; add sodium metabisulfite after 60 minutes of reaction, wherein the weight ratio of sodium metabisulfite to the mixture is 1:4, sodium metabisulfite must be added slowly, and the time is controlled within 10 minutes . Use liquid caustic soda to adjust the pH value to 11, heat preservation and sulfonation reaction at 85°C for 90 minutes and then start to cool down; when the temperature drops to 50°C, add hydrochloric acid to adjust the pH value to 4,...

Embodiment 2

[0016] The sulfonated melamine formaldehyde resin water reducer comprises the following raw materials: melamine, liquid formaldehyde and water, wherein the weight ratio of melamine, liquid formaldehyde and water is 20:52:15.

[0017] The preparation method of the sulfonated melamine-formaldehyde resin water-reducer comprises the following steps: firstly mix melamine, liquid formaldehyde and water at a weight ratio of 20:52:15 to obtain a mixture, and then use sodium hydroxide solution to adjust the pH value to 9.5, heat up to 45°C, keep warm and react for 60 minutes; add sodium metabisulfite after 60 minutes of reaction, wherein the weight ratio of sodium metabisulfite to the mixture is 1:4, adjust the pH value to 11 with liquid caustic soda, at 88°C After heat preservation sulfonation reaction for 90 minutes, start to cool down; when the temperature drops to 50°C, add hydrochloric acid to adjust the pH value to 4; after 30 minutes, add liquid caustic soda to adjust the pH valu...

Embodiment 3

[0019] The sulfonated melamine formaldehyde resin water reducer comprises the following raw materials: melamine, liquid formaldehyde and water, wherein the weight ratio of melamine, liquid formaldehyde and water is 15:35:9.

[0020] The preparation method of the sulfonated melamine-formaldehyde resin water-reducer comprises the following steps: first mixing melamine, liquid formaldehyde and water in a weight ratio of 15:35:9 to obtain a mixture, and then adjusting the pH value to 10.0, heat up to 50°C, heat preservation reaction for 60 minutes; add sodium metabisulfite after 60 minutes of reaction, wherein the weight ratio of sodium metabisulfite to the mixture is 1:4, adjust the pH value to 11 with liquid caustic soda, at 90°C After heat preservation sulfonation reaction for 90 minutes, start to cool down; when the temperature drops to 50°C, add hydrochloric acid to adjust the pH value to 4; after 30 minutes, add liquid caustic soda to adjust the pH value to 9; then raise the ...

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Abstract

The invention belongs to the technical field of resin and particularly relates to a sulfonated melamine formaldehyde resin water reducing agent and a preparation method thereof. The sulfonated melamine formaldehyde resin water reducing agent comprises the raw materials of melamine, liquid formaldehyde and water, wherein the ratio of weight parts of the melamine to the liquid formaldehyde to the water is (10-20):(25-52):(7-15). The sulfonated melamine formaldehyde resin water reducing agent is stable in resin molecular weight, excellent in dispersion for cement, high in water reducing rate and remarkable in early strength effect in the concrete application.

Description

technical field [0001] The invention belongs to the technical field of resins, and in particular relates to a sulfonated melamine formaldehyde resin water reducer and a preparation method thereof. Background technique [0002] Sulfonated melamine formaldehyde resin superplasticizer (SMF for short) is a water-soluble ionic polymer that plays an important role in the construction industry. The current synthesis process itself has the following problems: (1) It is difficult to control the molecular weight of the reaction, and it is difficult to accurately control the molecular weight of the reaction product during the reaction; (2) The stability of the resin is poor, and the performance of the obtained resin is unstable. In the process, the water reducing rate of the resin water reducing agent is greatly reduced; (3) Poor adaptability to cement in concrete application, poor fluidity and dispersion in cement static slurry, which affects the performance of cement. Contents of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B103/30
Inventor 赵超涛杜维乾赵锡斌
Owner SHANDONG ZHANHUA OSITER CHEM
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