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Polyether carboxylic acid water reducer and preparation method thereof

A water-reducing agent, polyether-type technology, applied in the field of concrete admixture and its preparation, can solve the problems of difficult control of reaction process, unsatisfactory water reduction rate and slump retention value, etc.

Inactive Publication Date: 2011-06-22
马清浩
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction process of the method provided by this patent is difficult to control, and the water reducing rate and slump retention value are still not very ideal.

Method used

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  • Polyether carboxylic acid water reducer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1: Add 320Kg allyl alcohol ether CH 2 =CHCH 2 O(CH 2 CH 2 O) n H (where n=10-60), 420Kg of maleic anhydride and 50Kg of sodium methacrylate sulfonate were added to 300Kg of water to prepare an aqueous solution, added to the reactor, stirred, and heated to 90°C;

[0020] Step 2: Add 13Kg of acrylamide, 26Kg of 2-hydroxyethyl acrylate and 140Kg of water and 860Kg of 3% aqueous solution of potassium persulfate initiator to the mixture obtained in step 1. During the dropping process Keep the temperature at 90℃, and the dripping time is 3-3.5 hours;

[0021] Step 3: After the dripping is completed, react at a constant temperature at 80-100°C for about 5 hours;

[0022] Step 4: Filter.

[0023] The yield was 94%. The slump retention value and water reduction rate value of the obtained product are shown in Table 1.

Embodiment 2

[0025] The other steps are the same as in Example 1, except that 320Kg propenol ether is used instead of CH whose n value is 200-300 2 =CHCH 2 O(CH 2 CH 2 O) n H replaces CH where n=10-60 in Example 1 2 =CHCH 2 O(CH 2 CH 2 O) n H. The yield was 90%. The slump retention value and water reduction rate value of the obtained product are shown in Table 1.

Embodiment 3

[0027] The other steps are the same as in Example 1, except that the amount of acrylamide is reduced to 8Kg. The yield was 80%. The slump retention value and water reduction rate value of the obtained product are shown in Table 1.

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Abstract

The invention provides a polyether carboxylic acid water reducer and a preparation method thereof. The water reducer is prepared from the following components: polypropylene alcohol ether, maleic anhydride, sodium methylallyl sulfonate, acrylamide, 2-hydroxyethyl acrylate, initiator and water.

Description

Technical field [0001] The invention relates to an admixture for concrete and a preparation method thereof, in particular to a polycarboxylic acid type water reducing agent and a preparation method thereof. Background technique [0002] Water reducer is also called dispersant or plasticizer. It is named because it can reduce the water consumption of fresh concrete when used. In the field of modern concrete technology, water reducer is one of the admixtures to improve the rheological properties of concrete, and has been used as the fifth component of concrete in addition to cement, sand, stone and water. [0003] Common water reducers mainly include lignin cyclic salt series, naphthalene series, melamine series, sulfamate series and polycarboxylic acid series. The 1930s to the 1960s were the application and development period of common water reducers. The water reducers used in the early days were mainly organic compounds such as sodium rosin, sodium lignosulfonate, and stearate, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F290/06C04B103/30
CPCC04B24/165
Inventor 马清浩
Owner 马清浩
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