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Preparation method of cement grinding aid

A cement grinding aid and grinding aid technology are applied in the preparation of grinding aids and the preparation of cement grinding aids, which can solve the problems of obvious difference in polymerization activity, decrease in polymerization efficiency, storage stability, etc., so as to avoid polymerization. Ineffective, optimized structure-activity relationship, strong structural adjustability

Active Publication Date: 2020-02-18
江苏金木土科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the compatibility of the various components of the grinding aid compounded with small molecules is different, and there are storage stability problems such as phase separation or crystallization.
For cement grinding aids synthesized by free radical polymerization, the polymerization activity of each polymerization monomer is significantly different, especially the polymerization activity of the polymerization monomer with poor water solubility is lower, which may easily lead to a decrease in polymerization efficiency or poor use effect.

Method used

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  • Preparation method of cement grinding aid
  • Preparation method of cement grinding aid
  • Preparation method of cement grinding aid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 0.0 parts of unsaturated carboxylic acid ester monomer A-1, and 35.3 parts of diluent ethylene glycol dimethyl ether, add them into the reactor, and start the stirring and temperature control device. Weigh 17.9 parts of ethylenediamine, add it into the reactor at a certain rate under normal pressure, control the temperature in the reactor to 0°C, and continue the heat preservation reaction for 10.0 hours after the addition, to obtain a brownish yellow liquid, which is recorded as B- 1.

[0036] In the same way, the following amino polyether was prepared according to the same method for the synthesis of grinding aids.

[0037] Amino polyether B-2: 100.0 parts of unsaturated carboxylate monomer A-2, 41.6 parts of diluent ethylene glycol methyl ethyl ether, 3.9 parts of butanediamine, the reaction conditions are 10°C and normal pressure, and the heat preservation reaction is 8.0h. A brownish-yellow liquid was obtained, which was denoted as B-2.

[0038] Amino polye...

Embodiment 2

[0044] Weigh 39.3 parts of ethylene oxide, and gradually add it to the above-mentioned amino polyether monomer B-1 at a certain rate, control the reaction temperature to 30°C, and the reaction pressure is the pressure generated by the reaction system itself. After the feeding is completed, continue to keep warm After 7.0 hours of reaction, a brownish-yellow liquid was obtained. Add acetic acid to neutralize to pH=7, raise the temperature to 80-100°C, and under the pressure condition of -0.1MPa, distill the diluent in the reaction system under reduced pressure and recover it for reuse. Add water to dilute to 40%-50% solid content to obtain a dark brown-yellow finished grinding aid, which is designated as C-1.

Embodiment 3

[0046] Weigh 2.7 parts of ethylene oxide and 3.6 parts of propylene oxide, and gradually add them into the above-mentioned amino polyether monomer B-2 at a certain rate, control the reaction temperature to 40°C, and the reaction pressure to be the pressure generated by the reaction system itself. After the feed was finished, the heat preservation reaction was continued for 4.0 h to obtain a brownish-yellow liquid. Add acetic acid to neutralize to pH=7, raise the temperature to 80-100°C, and under the pressure condition of -0.1MPa, distill the diluent in the reaction system under reduced pressure and recover it for reuse. Add water to dilute to 40% to 50% solid content to obtain a dark brown-yellow finished grinding aid, which is recorded as C-2.

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Abstract

The invention discloses a preparation method of a cement grinding aid, and the method comprises the following steps of: polymerizing polyamine monomers, unsaturated carboxylic acid esters, diluents, amine polyether and alkylene oxide according to a certain molar ratio under appropriate conditions. The invention provides a grinding aid with simple preparation method, strong structural adjustability, good grinding aid effect and high storage stability.

Description

technical field [0001] The invention relates to a preparation method of a grinding aid, in particular to a preparation method of a cement grinding aid, and belongs to the field of cement production technology application. Background technique [0002] my country is a big country in cement production and consumption, with an annual output of about 2.2 billion tons of cement. The power consumption of cement production accounts for about 9% of the domestic annual power generation, which is a high energy consumption industry. The cement production process includes three stages: grinding of raw materials, calcination of clinker, and grinding of cement. The production of one ton of cement requires about 57 kWh of electric energy, and the grinding process accounts for 50% to 70% of the total energy consumption. Optimizing grinding equipment or grinding process is one of the most effective measures to reduce energy consumption in cement production. Due to the long improvement period...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/26C08G65/333C04B24/32C04B103/52
CPCC08G65/2624C08G65/33306C04B24/32C04B2103/52
Inventor 张磊牟忠江范士敏刘江
Owner 江苏金木土科技有限公司
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