Polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylic acid series and water reducing agent, which is applied in the field of carboxylic acid series water reducing agent and its one-time addition method, concrete water reducing agent and its preparation field, can solve the problems of greatly reduced advantages, prolonged preparation time, and more Energy and other issues, to achieve the effect of reducing the need for production equipment and production conditions, simplifying the reaction process, and reducing the requirements for production conditions

Inactive Publication Date: 2012-12-19
JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The publication number is CN 102558455 A, and the Chinese invention patent titled "A low-volume, high-water-reducing polycarboxylate water-reducer and its preparation method" discloses a "one-step, one-pot method" for preparing polycarboxylate-based water-reducing agents. Water reducing agent, put block type polyoxyalkylene ether monomer, unsaturated carboxylic acid or unsaturated acid derivative monomer, alkenyl sulfonic acid monomer and azo or peroxy initiator into the reactor at one time In the method, it is obtained by radical polymerization in aqueous solution, and finally neutralized with an alkaline solution; this method has the advantages of simple process, simple operation, and easy control compared with the dropping method, but due to the lack of selection of more suitable materials and initiation systems, resulting in reaction The temperature is 60-90°C, not only due to the prolongation of the preparation time brought about by the heating and cooling process, but also puts forward higher requirements for the production equipment, and also consumes more energy. The advantages brought by the "one-step-one-pot method" also greatly discounted

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  • Polycarboxylate water reducer and preparation method thereof
  • Polycarboxylate water reducer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The polycarboxylic acid-based water reducing agent of the present embodiment is prepared according to the following steps:

[0029] Step 1. Pour 120g of isobutylene polyoxyethylene ether with a molecular weight of 2400, 2.7g of itaconic acid, 10g of maleic anhydride, 1.5g of acrylic acid, 2g of sodium allyl sulfonate and 0.8g of 30% concentration hydrogen peroxide into a three-necked reaction flask , then add 120g of water, stir and heat to 25°C;

[0030]Step 2: Dissolve 0.25g ascorbic acid and 0.15g mercaptopropionic acid in 40g water to form a reducing agent aqueous solution, add it to the reaction flask at one time, and stir evenly;

[0031] Step 3. Control the reaction at 30-45°C for 4h;

[0032] Step 4: adding 40% sodium hydroxide solution to adjust the pH value of the product after the heat preservation reaction to 6-7, to obtain a polycarboxylic acid-based water reducing agent.

Embodiment 2

[0034] The polycarboxylic acid-based water reducing agent of the present embodiment is prepared according to the following steps:

[0035] Step 1. Mix 120g isobutylene polyoxyethylene ether with a molecular weight of 2400, 10g maleic anhydride, 2.2g methacrylic acid, 2.5g fumaric acid, 1.2g acrylamide, 2.3g sodium methallyl sulfonate and 1.2g Pour ammonium persulfate into a three-necked reaction flask, add 120 g of water, stir and heat to 25°C;

[0036] Step 2: Dissolve 0.2g ascorbic acid and 0.01g ferrous sulfate in 40g water to form a reducing agent aqueous solution, add it to the reaction flask at one time, and stir evenly;

[0037] Step 3. Control the reaction for 3.5h under the temperature range of 30-45°C;

[0038] Step 4: adding 40% sodium hydroxide solution to adjust the pH value of the product to 6-7 to obtain a polycarboxylic acid-based water reducing agent.

Embodiment 3

[0040] The polycarboxylic acid-based water reducing agent of the present embodiment is prepared according to the following steps:

[0041] Step 1. Pour 120g of isoprene polyoxyethylene ether with a molecular weight of 2400, 12g of maleic acid, 3g of fumaric acid, 2.5g of sodium vinyl sulfonate and 1.5g of ammonium persulfate into a three-necked reaction flask, and then add 120g of water, stirred and heated to 25°C;

[0042] Step 2: Dissolve 0.2g of ascorbic acid and 0.2g of thioglycolic acid in 40g of water to form a reducing agent aqueous solution, add it to the reaction flask at one time, and stir evenly;

[0043] Step 3. Control the reaction for 4h under the temperature range of 30-45°C;

[0044] Step 4: adding 40% sodium hydroxide solution to adjust the pH value of the product to 6-7 to obtain a polycarboxylic acid-based water reducing agent.

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Abstract

The invention relates to a water reducer used for concrete and a preparation method thereof, in particular to a polycarboxylate water reducer and a preparation method thereof, belonging to the field of concrete admixture technology. The polycarboxylate water reducer comprises the following components, based on parts by mass: 100 parts of polyoxyethylene methyl alkenyl ether macromer, 4-18 parts of unsaturated carboxylic acid and acid amide or acid anhydride, 1-6 parts of unsaturated sulfonate monomer, 0.5-3 parts of oxidizer, 0.01-0.5 parts of a reducing agent, 3- 15 parts of sodium hydroxide and 100-200 parts of water. According to the method, the characteristics such as excellent ability of water-reducing, low slump loss and good adaptability to different types of cement and concrete admixture are shown in the product at low accretion by means of one time addition; and the cost performance is high. The method has advantages that requirements for production equipment and production conditions in industrial production can be further lowered, energy consumption is reduced, and the method is economical, environment-friendly and beneficial to be generalized.

Description

technical field [0001] The invention relates to a water-reducing agent for concrete and a preparation method thereof, in particular to a carboxylic acid-based water-reducing agent and a preparation method of a one-time addition method, belonging to the technical field of concrete admixtures. Background technique [0002] Water reducing agent is an indispensable component in modern concrete except cement, sand, stone, water and admixtures. The use of concrete water-reducing agent is one of the technical ways to reduce the amount of cement, improve the utilization rate of industrial waste, and realize the durability and high performance of concrete. In the development process of high performance and functionalization of concrete, the role of chemical admixtures represented by superplasticizers is crucial. The level of its production and application technology largely determines the production technology and construction application level of today's concrete materials, and it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B103/30
Inventor 王万林刘益军章玲王高明郑春扬郭兆来
Owner JIANGSU CHINA RAILWAY ARIT NEW MATEIRALS CO LTD
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