Preparation method of cement dispersing agent with clay adaptability and viscosity reduction effect

A cement dispersant and adaptability technology, which is applied in the field of concrete admixtures, can solve the problems of poor adaptability of clay and high viscosity of concrete, and achieve the effects of improved adaptability of clay, low production energy consumption and strong electrostatic effect

Active Publication Date: 2018-05-22
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: To solve the problem of poor adaptability of existing polycarboxylate water reducer to clay in machine-made sand and high viscosity of prepared concrete

Method used

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  • Preparation method of cement dispersing agent with clay adaptability and viscosity reduction effect
  • Preparation method of cement dispersing agent with clay adaptability and viscosity reduction effect
  • Preparation method of cement dispersing agent with clay adaptability and viscosity reduction effect

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0036] Preparation of Intermediate Product C-1 by Stepwise Addition of Amino-Terminal Polyethers and Diglycidyl Ethers

[0037] Weigh 100 parts of amino polyether (Mn=1000) (code-named ATPE-1000) and 17.42 parts of ethylene glycol diglycidyl ether into a four-necked flask equipped with stirring and temperature measurement, pass nitrogen gas-vacuum three times, remove The air in the system was slowly heated to 100°C with stirring, and after 5 hours of heat preservation reaction, 5 parts of aminopolyether ATPE-1000 was added, and after 2 hours of continuous reaction, it was cooled to room temperature to obtain a brown solid C-1. The weight average molecular weight determined by gel chromatography was 12300.

[0038] Similarly, the following stepwise addition polymerization intermediates C-2 to C-9 were prepared.

preparation example 2

[0040] C-2: Weigh 100 parts of amino polyether ATPE-1000 (Mn=1000) and 20.23 parts of 1,4-butanediol diglycidyl ether into a four-necked flask equipped with stirring and temperature measurement, blow nitrogen-pump Vacuum three times to remove the air in the system, and slowly raise the temperature to 120°C while stirring. After 7 hours of heat preservation reaction, add 2 parts of amino polyether ATPE-1000, continue the reaction for 2 hours, and cool to room temperature to obtain a brown solid. C-2, the weight average molecular weight determined by gel chromatography is 15600.

preparation example 3

[0042] C-3: Weigh 100 parts of amino polyether ATPE-1000 (Mn=1000) and 22.22 parts of 1,3-benzenediol diglycidyl ether into a four-necked flask equipped with stirring and temperature measurement, and nitrogen-pump Vacuum three times to remove the air in the system, and slowly raise the temperature to 90°C while stirring. After 10 hours of heat preservation reaction, add 2 parts of aminopolyether ATPE-1000, continue the reaction for 2 hours, and cool to room temperature to obtain a brown solid C-3, the weight average molecular weight determined by gel chromatography is 23000.

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Abstract

The invention discloses a preparation method of a cement dispersing agent with clay adaptability and viscosity reduction effect. The preparation method comprises the following steps: gradually performing addition polymerization reaction on terminal amino polyether and diglycidyl ether material based on the molar ratio of 1: 1; adding 2-5% by weight of terminal amino polyether for sealing the end after the reaction is finished so as to obtain an intermediate product; and then performing phosphate esterification on the intermediate product and phosphoric acid through a catalyst and a water-carrying agent to obtain the cement dispersing agent. The cement dispersing agent prepared by the method is high in clay adaptability, good in dispersing effect, and obvious in viscosity reduction effect;the selected raw materials are low in cost; the synthesizing process is simple and efficient; the energy consumption in production is low; and the preparation technology has a good industrial prospect.

Description

technical field [0001] The invention relates to a cement dispersant which has good adaptability to clay contained in sand and gravel aggregates, has a remarkable viscosity-reducing effect, and contains a plurality of phosphate adsorption groups and a preparation method thereof, belonging to the technical field of concrete admixtures . Background technique [0002] As the third-generation high-performance water reducer (cement dispersant), polycarboxylic acid has gradually replaced the second-generation high-efficiency water reducer due to its high water-reducing rate, excellent slump retention performance, and easy functionalization. Water agent has become the mainstream of the market. However, in the application process of polycarboxylic acid, some problems also appeared, which affected its further promotion. [0003] With the scarcity of natural high-quality sand and gravel and other material resources and the development of green building concepts, recycling constructio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/327C08G65/331C08G65/338C04B24/32C04B103/40
CPCC04B24/246C04B2103/408C08G65/26C08G65/327C08G65/338
Inventor 冉千平黄振杨勇
Owner JIANGSU SOBUTE NEW MATERIALS
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