Preparation method of high efficiency controllable polycarboxylic acids series cement grinding aid

A cement grinding aid and polycarboxylic acid-based technology, which is applied in the field of high-efficiency and controllable polycarboxylic acid-based cement grinding aid preparation, can solve the problems of large fluctuation of use effect, narrow adaptability, poor stability of grinding aid, etc. , to achieve the effect of reducing sieve residue, stable application performance and increasing compressive strength

Inactive Publication Date: 2012-11-28
LIAOCHENG TIANCHENG CEMENT TECH RES DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the shortcomings of the current research and application of polycarboxylate grinding aids and the problems of poor stability, narrow adaptability, and large fluctuations in the use of grinding aids on the market, the present invention aims to propose a high-efficiency controllable polycarboxylate-based grinding aid. The preparation method of cement grinding aid - reversible addition-fragmentation chain transfer controllable / "active" free radical (Reversible Addition-Fragmentation Chain Transfer Free Radical Polymerization, RAFT) emulsion polymerization, at the microscopic molecular level to achieve high polycarboxylate The molecular weight and distribution of molecular grinding aids can be controlled, so as to optimize the use effect of grinding aids

Method used

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  • Preparation method of high efficiency controllable polycarboxylic acids series cement grinding aid
  • Preparation method of high efficiency controllable polycarboxylic acids series cement grinding aid
  • Preparation method of high efficiency controllable polycarboxylic acids series cement grinding aid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put 8.2 parts of allyl polyoxyethylene ether (800), 3.3 parts of sodium methacrylate, 3.5 parts of methacrylic acid, 0.5 parts of benzyl dithiobenzoate, and 10 parts of absolute ethanol in a reaction kettle and mix them , then add 64.5 parts of aqueous solution containing 15% sodium dodecylbenzenesulfonate, stir and mix evenly, and make emulsion A; make solution B with 0.8 parts of potassium persulfate and 9.2 parts of water; pass nitrogen in emulsion A Under certain conditions, when the temperature rises to 85°C, add the above-mentioned solution B dropwise, adjust the flow meter for 2 hours, and continue the reaction for 10 hours to obtain a light yellow liquid; after the reaction, add a 30% sodium hydroxide solution Neutralize until the pH is 7.0±0.5, then add triethanolamine accounting for 7% of the total mass of the reaction system into the solution, and stir evenly to obtain the finished product.

Embodiment 2

[0028] 18.5 parts of methallyl polyoxyethylene ether (600), 10.2 parts of 2-acrylamido-2-methylpropanesulfonic acid, 1.3 parts of acrylic acid, 0.8 parts of cumyl dithiobenzoate, 10 parts Put absolute ethanol in the reaction kettle and mix, then add 49.2 parts of aqueous solution containing 30% OP-10, stir and mix evenly, and make emulsion A; make solution B with 1.0 parts of potassium persulfate and 9.0 parts of water; Under the condition of flowing nitrogen in A, when the temperature is raised to 80°C, add the above prepared solution B dropwise, adjust the flow meter to finish dripping in 1.5h, continue the reaction for 15h, and obtain a light yellow liquid; after the reaction, add a mass fraction of 30 % sodium hydroxide solution to neutralize to a pH of 7.0±0.5, then add triethanolamine accounting for 3% of the total mass of the reaction system to the solution, and stir evenly to obtain the finished product.

Embodiment 3

[0030] Put 16.0 parts of isopentenol polyoxyethylene ether (1000), 2.3 parts of sodium allyl sulfonate, 1.7 parts of acrylic acid, 0.6 parts of benzyl dithiobenzoate, and 10 parts of absolute ethanol in a reaction kettle and mix them. Then add 59.4 parts of aqueous solution dissolved with 20% sodium dodecylbenzenesulfonate, stir and mix evenly, and make emulsion A; make solution B with 1.0 parts of ammonium persulfate and 9.0 parts of water; Under certain conditions, when the temperature is raised to 70°C, add the prepared solution B dropwise, adjust the flowmeter to finish dripping in 1.5 hours, and continue the reaction for 15 hours to obtain a light yellow liquid; after the reaction is completed, add sodium hydroxide with a mass fraction of 30% The solution is neutralized until the pH is 7.0±0.5, and then triethanolamine accounting for 5% of the total mass of the reaction system is added to the solution, and stirred evenly to obtain the finished product.

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Abstract

The invention relates to a preparation method of a high efficiency controllable polycarboxylic acids series cement grinding aid, which comprises the following steps: mixing nonsaturated polyether, nonsaturated sulfonic acid, unsaturated carboxylic acid, a RAFT chain transferring agent and absolute ethanol, adding an emulsifier aqueous solution, uniformly stirring and mixing to prepare an emulsion A; blending an initiator and water to obtain a solution B; under the condition that nitrogen is introduced in the emulsion A, heating to certain temperature and adding the solution B drop by drop, adjusting a flowmeter by finishing dropping after 1.0-2.5 hours, continuously reacting for 10-15 hours; after the reaction is finished, adding a sodium hydroxide solution with mass fraction of 30% and neutralizing to obtain the pH value between 6.5 and 7.5, adding triethanolamine which accounts for 3-7% of total mass of a reaction system in the solution drop by drop, and uniformly stirring to obtain the polycarboxylic acids series grinding aid product. The preparation principle is RAFT controllable/active free radical emulsion polymerization. The polycarboxylic acids series cement grinding aid has the advantages of low effective mixing amount and stable applicability, and has substantial effects for improving and enhancing the cement grinding aiding and cement physical properties.

Description

technical field [0001] The invention belongs to the technical field of cement production and processing, and relates to an external grinding aid for cement production, in particular to a preparation method of an efficient and controllable polycarboxylate cement grinding aid. technical background [0002] Cement grinding aid is an admixture added during cement grinding to aid in grinding without damaging human health and the performance of cement concrete. It is divided into two types: liquid and solid. Cement grinding is completed under the mutual collision, extrusion, friction, etc. of the material and the grinding medium in the mill. It is a process of physical and chemical changes caused by mechanical action. The grinding process has high energy consumption and low utilization rate, and more than 90% of the energy is converted into heat energy and is wasted. How to achieve energy saving, consumption reduction and emission reduction has become a matter of great concern to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F228/02C08F220/58C08F220/06C08F2/38C04B24/16C04B103/52
Inventor 张学成陶绪泉丁俊红李相成
Owner LIAOCHENG TIANCHENG CEMENT TECH RES DEV
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