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Preparation method for cement grinding aid

A cement grinding aid and initiator technology, applied in the field of building materials, can solve the problems of unsatisfactory cement reinforcement effect and poor cement compatibility, and achieve the effects of preventing adsorption and aggregation, improving compactness and improving compatibility.

Inactive Publication Date: 2018-06-15
杨忠华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention: Aiming at the problem that the current cement grinding aid can effectively reduce the electrostatic adsorption phenomenon, but its compatibility with cement is not good, resulting in unsatisfactory cement strengthening effect, a preparation of cement grinding aid is provided method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] A kind of preparation method of cement grinding aid, this preparation method comprises the steps:

[0027] (1) Dry the licorice residue at a temperature of 50~60°C for 5~6 hours, pass through a 40~60 mesh sieve to obtain the sieved product, and place the sieved product and toluene-ethanol solution in a cable according to the mass ratio of 1:3~4. Extraction in an extractor for 6-8 hours to obtain the residue, and dry the residue at a temperature of 30-40°C to obtain a dried product. According to a mass ratio of 1:5-6, the dried product, Mix and heat 0.8mol / L sodium hydroxide solution, carry out vacuum filtration at a temperature of 40~50°C and a vacuum degree of 0.03~0.05MPa to obtain a filtrate, and concentrate the filtrate under reduced pressure at a vacuum degree of 13.3Pa to obtain a concentrate , according to the mass ratio of 1:3~4, mix the concentrate and 1.0mol / L ethanol solution, let it stand for 1~2h, filter to obtain filtrate a, concentrate the filtrate, recov...

Embodiment 1

[0032] Toluene-ethanol solution is to mix 1.0mol / L ethanol solution and toluene at a mass ratio of 1:2 to obtain a mixture, that is, toluene-ethanol solution.

[0033] Dilute sulfuric acid refers to an aqueous solution of sulfuric acid with a solute mass fraction of 50%.

[0034] The initiator is ammonium persulfate.

[0035] A kind of preparation method of cement grinding aid, this preparation method comprises the steps:

[0036] (1) Dry the licorice residue at a temperature of 50°C for 5 hours, pass through a 40-mesh sieve to obtain the sieved matter, and put the sieved matter and toluene-ethanol solution in a Soxhlet extractor for extraction according to the mass ratio of 1:3. The time is 6 hours, the residue is obtained, and the residue is dried at a temperature of 30°C to obtain a dried product. The dried product and 0.8mol / L sodium hydroxide solution are mixed and heated at a temperature of 1:5. Vacuum suction filtration at 40°C and a vacuum of 0.03MPa to obtain the fi...

Embodiment 2

[0041] Toluene-ethanol solution is to mix 1.0mol / L ethanol solution and toluene at a mass ratio of 1:2 to obtain a mixture, that is, toluene-ethanol solution.

[0042] Dilute sulfuric acid refers to an aqueous solution of sulfuric acid with a solute mass fraction of 55%.

[0043] The initiator is ammonium persulfate.

[0044] A kind of preparation method of cement grinding aid, this preparation method comprises the steps:

[0045] (1) Dry the licorice residue at a temperature of 55°C for 5 hours, pass through a 50-mesh sieve to obtain the sieved matter, and put the sieved matter and toluene-ethanol solution in a Soxhlet extractor for extraction according to the mass ratio of 1:3. The time is 7 hours, the residue is obtained, and the residue is dried at a temperature of 35°C to obtain a dried product. According to a mass ratio of 1:5, the dried product and 0.8mol / L sodium hydroxide solution are mixed and heated. Vacuum suction filtration at 45°C and a vacuum of 0.04MPa to obt...

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Abstract

The invention relates to the technical field of building materials, specifically to a preparation method for a cement grinding aid. According to the invention, lignosulfonate is extracted from glycyrrhiza residue; due to containing of a plurality of functional groups in a lignosulfonate structure, lignin has a plurality of chemical properties and can generate chemical reactions, so a basis is laidfor subsequent reactions; acrylamide is utilized for graft copolymerization of the lignosulfonate, so the lignosulfonate has increased molecular weight and developed mesh structure, and the enmeshment effect of the lignosulfonate is increased; introduction of a -CONH2 group with strong adsorption effect into the lignosulfonate improves the adsorption capacity of the lignosulfonate on the surfaceof cement, and helps grinding aid molecules, fly ash and mineral slag to infiltrate into the pores of a cement clinker to generate wedge effects, so the grind-aiding performances of the lignosulfonateis improved; meanwhile, through infiltration of the fly ash and the mineral slag, coarse pores of the mineral slag are filled with fly ash microglass beads, so a micro-aggregate grading effect is fulled exerted; and through complementary advantages of the fly ash and the mineral slag, the compactness of a cement paste or the concrete is improved, and the strength of the cement can be easily improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of a cement grinding aid. Background technique [0002] my country has a large cement output and has become the largest producer of cement. Cement production consumes a lot of energy, and its grinding process accounts for two-thirds of the total electricity consumption, so the energy utilization rate is low. Therefore, improving the grinding efficiency is the key to saving energy and reducing consumption in cement production. During the cement grinding process, when the cement particles receive external mechanical energy, in addition to the miniaturization of the particle size and the increase of the specific surface area, the amorphous surface layer of the particles, lattice defects, lattice distortion, and surface free energy increase, etc. A series of changes make the particles in a metastable high-energy state, thereby improving the activity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C04B24/18C08F291/08C08F291/14C08F289/00C08F220/56C08F216/08C04B103/52
CPCC04B40/0042C04B2103/52C08F283/06C08F285/00C08F289/00C04B24/18C04B24/2605C04B22/0006C08F220/56C08F216/08
Inventor 杨忠华乔舍林凡
Owner 杨忠华