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Cement grinding aid and preparation method thereof

A technology of cement grinding aids and catalysts, applied in the field of cement additives, can solve problems such as corrosion of concrete steel bars, affecting the service life and durability of concrete, and achieve the effects of improving early strength performance, good environmental protection benefits, and reducing costs

Inactive Publication Date: 2022-05-13
辛集慕湖混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patented technology requires the use of salts containing chloride ions such as sodium chloride and potassium chloride to increase the effect of grinding aids, but the presence of chloride ions is likely to cause corrosion of steel bars in concrete and affect the service life and durability of concrete

Method used

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  • Cement grinding aid and preparation method thereof
  • Cement grinding aid and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] The present embodiment provides a kind of preparation method of cement grinding aid, comprises the following steps:

[0034] (1) Preparation of polydopamine / catechol modified chitosan powder, the method is as follows:

[0035] S1. Preparation of catechol-modified chitosan: 100 parts by weight of chitosan is dissolved in 200 parts by weight of 10wt% acetic acid solution, then NaOH solution of 1mol / L is added to adjust the pH value to 5, and 100 parts by weight of Add 15 parts by weight of an aqueous solution of 3,4-dihydroxyphenylacetic acid into the above solution, dropwise add 20 parts by weight of a 30wt% ethanol aqueous solution containing 0.5 parts by weight of EDC and 0.5 parts by weight of NHS, stir for 7 hours, and filter. Washing to obtain catechol-modified chitosan;

[0036]S2. Preparation of polydopamine / catechol-modified chitosan: add 100 parts by weight of catechol-modified chitosan prepared in step S1 to 200 parts by weight of water, 1000W ultrasonic dispe...

Embodiment 2

[0040] The present embodiment provides a kind of preparation method of cement grinding aid, comprises the following steps:

[0041] (1) Preparation of polydopamine / catechol modified chitosan powder, the method is as follows:

[0042] S1. Preparation of catechol-modified chitosan: 100 parts by weight of chitosan is dissolved in 200 parts by weight of 10wt% acetic acid solution, then the KOH solution of 2mol / L is added to adjust the pH value to 6, and 100 parts by weight of Add 30 parts by weight of 3,4-dihydroxyphenylacetic acid aqueous solution into the above solution, dropwise add 20 parts by weight of 60 wt% ethanol aqueous solution containing 1 part by weight of EDC and 1 part by weight of NHS, stir for 12 hours, filter, Washing to obtain catechol-modified chitosan;

[0043] S2. Preparation of polydopamine / catechol-modified chitosan: add 100 parts by weight of catechol-modified chitosan prepared in step S1 to 200 parts by weight of water, 1000W ultrasonic dispersion for 30...

Embodiment 3

[0047] The present embodiment provides a kind of preparation method of cement grinding aid, comprises the following steps:

[0048] (1) Preparation of polydopamine / catechol modified chitosan powder, the method is as follows:

[0049] S1. Preparation of catechol-modified chitosan: Dissolve 100 parts by weight of chitosan in 200 parts by weight of 10wt% acetic acid solution, then add 1.5mol / L of NaOH solution, adjust the pH value to 5.5, and dissolve 100 parts by weight of Add 22 parts by weight of an aqueous solution of 3,4-dihydroxyphenylacetic acid into the above solution, dropwise add 20 parts by weight of 45 wt% ethanol aqueous solution containing 0.7 parts by weight of EDC and 0.7 parts by weight of NHS, stir for 10 hours, and filter , washed with water to obtain catechol-modified chitosan;

[0050] S2. Preparation of polydopamine / catechol-modified chitosan: add 100 parts by weight of catechol-modified chitosan prepared in step S1 to 200 parts by weight of water, 1000W ul...

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Abstract

The invention provides a cement grinding aid and a preparation method thereof, and belongs to the technical field of cement aids. The invention discloses a modified chitosan adsorbent which is prepared from the following raw materials in parts by weight: 15-30 parts of polydopamine / catechol modified chitosan, 10-15 parts of sodium tripolyphosphate, 20-30 parts of industrial waste liquid and 3-10 parts of chlorinated hydrocarbon. According to the polydopamine / catechol modified chitosan, chitosan and 3, 4-dihydroxyphenylacetic acid are subjected to a condensation reaction, and then polydopamine is further generated on the surface in situ, so that the polydopamine / catechol modified chitosan is obtained. The cement grinding aid prepared by the invention not only can improve the early strength performance and grinding aiding effect of cement, but also can improve the antibacterial property, dispersity and fluidity of the cement, is more environment-friendly by using the industrial waste liquid, reduces the cost, and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of cement additives, in particular to a cement grinding aid and a preparation method thereof. Background technique [0002] In cement production, the grinding process is the link with the highest energy consumption, and the energy utilization rate is extremely low, and only a small part is used to increase the specific surface area of ​​the material. Adding a small amount of chemical additives—grinding aids during the grinding process can significantly improve the grinding efficiency and reduce energy consumption. [0003] Cement grinding aid is a chemical additive that improves the grinding effect and performance of cement. It is used in the grinding process of cement materials. Adding a small amount of grinding aid can significantly improve the grinding efficiency or reduce energy consumption, and significantly improve the cement table. hourly output and various technical indicators without compromising t...

Claims

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Application Information

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IPC IPC(8): C04B24/38C08B37/08C04B103/52C04B103/67C04B103/40
CPCC04B40/0039C04B24/38C08B37/003C04B2103/52C04B2103/67C04B2103/408C04B22/16C04B22/141C04B24/28C04B24/005C04B24/04
Inventor 毕明强
Owner 辛集慕湖混凝土有限公司
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