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A kind of polycarboxylate cement grinding aid and preparation method thereof

A technology of cement grinding aid and polycarboxylate, which is applied in the field of cement process admixtures, can solve problems such as high cost and unstable system, achieve low cost, serious solution dependence, and good corrosion resistance of steel bars

Active Publication Date: 2011-11-30
安徽海螺材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the shortcomings of currently commercially available cement grinding aids, which are single chemical products or simply physically compounded from several chemical raw materials, the system is unstable and the cost is high, this paper proposes a new method of synthesizing polycarboxylic acid with polymer materials Salt cement grinding aid technology greatly reduces the amount of alcohol amines. The carboxylate cement grinding aid has good performance, lower cost than traditional grinding aids, and good system stability

Method used

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  • A kind of polycarboxylate cement grinding aid and preparation method thereof
  • A kind of polycarboxylate cement grinding aid and preparation method thereof
  • A kind of polycarboxylate cement grinding aid and preparation method thereof

Examples

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Embodiment 1

[0022] Add 0.1 part of MAS and a certain amount of deionized water into a four-neck flask, add 0.5 part of NPEG (molecular weight 600), 0.1 part of AMPS and 0.3 part of MAA into deionized water to form a monomer solution, and use 1% of the total amount of monomer Potassium persulfate was added to deionized water to prepare an initiator solution. When the temperature reached 75°C, the initiator solution was added dropwise. The monomer solution was added dropwise 5 minutes later than the initiator solution. After 5 hours, the dropwise addition was completed, and the temperature was raised to 90°C. Keep warm for 1 hour. Cooling is neutralized with 40% sodium hydroxide solution to obtain polymer A solution, and 5% TEA is added to the solution to obtain the polycarboxylate cement grinding aid 1.

Embodiment 2

[0024] Add a certain amount of deionized water in a four-neck flask, add 0.6 part of NPEG (molecular weight 400), 0.15 part of AAM and 0.25 part of MAA into deionized water to form a monomer solution, and use ammonium persulfate accounting for 1.5% of the total monomer Add deionized water to prepare an initiator solution. When the temperature reaches 70°C, start to add the initiator solution dropwise. The monomer solution is added dropwise 5 minutes later than the initiator solution. After 4 hours, the dropwise addition is completed, and the temperature is raised to 95°C and kept for 2 hours. Cooling is neutralized with 40% sodium hydroxide solution to obtain polymer A solution, and 5% TIPA is added to the solution to obtain the polycarboxylate cement grinding aid 2.

Embodiment 3

[0026] Add 0.15 parts of SAS and a certain amount of deionized water into a four-neck flask, add 0.55 parts of NPEG (molecular weight 400), 0.25 parts of MAM and 0.25 parts of AA into deionized water to form a monomer solution, and use 1.5% of the total amount of monomers Potassium persulfate was added to deionized water to prepare an initiator solution. When the temperature reached 80°C, the initiator solution was added dropwise. The monomer solution was added dropwise 5 minutes later than the initiator solution. After 4 hours, the dropwise addition was completed, and the temperature was raised to 90°C. Keep warm for 1 hour. Cool and neutralize the solution with 40% sodium hydroxide and ammonia water to obtain polymer A solution, add 4% TEA to the solution to obtain the polycarboxylate cement grinding aid 3.

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Abstract

The invention discloses a polycarboxylate cement grinding aid and a preparation method thereof. The preparation method comprises the following steps of: performing copolymerization on comonomers in aqueous solution in the presence of an initiator to obtain a polymer A, wherein the comonomers comprise ether monomers, amine monomers and carboxylic acid monomers; and adding a small amount of alcamines substance B into the polymer A to obtain the polycarboxylate cement grinding aid. The grinding aid has the advantages of obviously improving grinding efficiency and greatly improving cement strength, along with simple production method and environmental protection.

Description

Technical field: [0001] The invention belongs to the technical field of cement process admixtures, and in particular relates to a carboxylate cement grinding aid and a preparation method thereof. Background technique: [0002] Cement grinding aids, also known as cement grinding process admixtures, are additives added during cement grinding to aid in grinding without damaging the performance of cement. The amount added should not exceed 1% of the cement mass. During the cement grinding process, 95% of the energy is lost as heat energy. When the fineness of cement increases, the efficiency of cement powder selection decreases due to the aggregation of fine particles, resulting in a rapid decrease in grinding efficiency. A good way to improve this situation is to add cement grinding aids during the grinding process. Adding 0.01%-0.05% grinding aids to the mill can significantly increase the cement output by 5% to 30%. my country's cement output is huge. In 2008, the cement out...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C08F226/02C08F220/06C08F220/58C08F220/56C08F228/02C04B103/52
CPCC04B24/165
Inventor 严生赵洪义冯恩娟
Owner 安徽海螺材料科技股份有限公司
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