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[Chemical Knowledge]：Production and manufacturing method and process flow of polycarboxylic acid water reducing agent monomer

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The manufacturing method
of polycarboxylate superplasticizer monomer
1. Introduction

polycarboxylate superplasticizer monomer is an important chemical production raw material, widely used in concrete, mortar and other building materials to improve its performance and durability. With the rapid development of the construction industry, the demand for polycarboxylate superplasticizer monomer is also increasing, so it is of great significance to study its manufacturing method.

2. Materials and Methods

1. Material

The raw materials required for this experiment mainly include: methacrylic acid, acrylic acid, sodium methacrylate, acrylamide, etc.

2. equipment

experimental equipment includes: four flask, stirrer, dropping funnel, constant temperature water bath, pH meter, etc.

3. Manufacturing Method

(1) Premixing: Methacrylic acid, acrylic acid and sodium methacrylate are mixed together in a certain proportion for standby.

(2) preparation of initiator: ammonium persulfate and sodium bisulfite are mixed according to a certain proportion to prepare an initiator.

(3) Polymerization: A certain amount of deionized water was added to a four-necked flask, heated to a set temperature, and part of the pre-mixture and initiator were added to start the polymerization. During the reaction, the remaining premix and initiator were gradually added dropwise through a dropping funnel. At the same time, the pH value of the reaction system is controlled within the set range.

(4) Post-treatment: After the reaction is completed, the product is cooled to room temperature, the pH value is adjusted to neutral with sodium hydroxide solution, and the impurities are removed by filtration to obtain a polycarboxylic acid superplasticizer monomer.

3. results and discussion

1. Effect of polymerization reaction temperature on product properties

experimental results show that polymerization reaction temperature has an important effect on product properties. Proper increase of the reaction temperature is beneficial to accelerate the reaction rate and increase the molecular weight of the product. However, high temperature will lead to increased side reactions, affecting product performance. Therefore, it is necessary to select the appropriate reaction temperature to ensure product performance.

2. The effect of pH value on the product performance

experimental results show that the pH value of the reaction system also has an important influence on the product performance. In the appropriate pH range, the product performance is better. If the pH value is too high or too low, the product properties will be adversely affected. Therefore, it is necessary to strictly control the pH of the reaction system during the manufacturing process.

4. conclusion

This study discusses the manufacturing method of polycarboxylate superplasticizer monomer by experimental method, and studies the effect of polymerization temperature and pH value on the performance of the product. The experimental results show that the polycarboxylate superplasticizer monomer with excellent performance can be prepared under the appropriate reaction temperature and pH value. This study provides theoretical guidance and practical basis for the production of polycarboxylate superplasticizer monomer, and helps to improve its production efficiency and product quality.

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