Cement grinding aid and preparation method thereof

A cement grinding aid and water reducing agent technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of amino hydroxyl compounds, etc. The problem of high salt content of the agent can achieve the effect of significant spatial position effect, which is beneficial to flow and improves the strength of cement.

Inactive Publication Date: 2021-01-01
XINYANG LINGSHI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional compound grinding aid mainly composed of triethanolamine has some defects in the process of use, such as: poor adaptability to concrete admixtures; the main component of the compound grinding aid is triethanolamine, etc., and the cost is high; The grinding performance is unstable and the dosage is sensitive; most grinding aids contain high salt content, which is harmful to the production of high-quality durable cement; the function is single; some liquid grinding aids contain harmful and volatile substances such as urea and ammonia water, which are harmful to the human body

Method used

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

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preparation example Construction

[0042]The invention also provides a method for preparing modified alcohol amine in cement grinding aids, which includes the following steps:

[0043]1) Preparation of 3,3-bis(chloromethyl)oxetane: react pentaerythritol and thionyl chloride in ice-water bath for 0.5~2h, overbased alumina column, purification to obtain 3,3-bis(chloro (Methyl) oxetane, the molar ratio of pentaerythritol to thionyl chloride is 1:1.01~1.05;

[0044]2) Preparation of modified alcohol amine: add the amine compound to 3,3-bis(chloromethyl)oxetane for 0.5~1h, add sodium azide and stir for 0.5~2h, after purification Add a reducing agent to perform a reduction reaction for 0.5 to 1h to obtain a modified alcohol amine. The molar ratio of the 3,3-bis(chloromethyl)oxetane, organic alcohol amine, sodium azide and the reducing agent is 1: 1.01~1.05: 2.01~2.1: 0.01~0.05.

[0045]The amine compound described in step 2) is one or a mixture of ammonia, ethanolamine, n-propanolamine, diethanolamine, diisopropanolamine, diglycola...

Embodiment 1

[0049]1) Preparation of 3,3-bis(chloromethyl)oxetane: react pentaerythritol and thionyl chloride in ice-water bath for 0.5~2h, overbased alumina column, purification to obtain 3,3-bis(chloro (Methyl) oxetane, the molar ratio of pentaerythritol to thionyl chloride is 1:1.01;

[0050]2) Preparation of modified alcohol amine: add the amine compound to 3,3-bis(chloromethyl)oxetane for 0.5~1h, add sodium azide and stir for 0.5~2h, after purification Add a reducing agent to perform a reduction reaction for 0.5 to 1h to obtain a modified alcohol amine. The molar ratio of the 3,3-bis(chloromethyl)oxetane, organic alcohol amine, sodium azide and the reducing agent is 1:1.01:2.01:0.01;

[0051]3) Combine 20 parts by weight of modified alcohol amine, 40 parts by weight of water reducing agent, 0.1 parts by weight of sodium molybdate, 1 part by weight of mineral fiber, 0.02 parts by weight of methyl tert-butyl ether, 1 part by weight The polycarbonate, 0.01 parts by weight of water retention agent, 0...

Embodiment 2

[0058]1) Preparation of 3,3-bis(chloromethyl)oxetane: react pentaerythritol and thionyl chloride in ice-water bath for 0.5~2h, overbased alumina column, purification to obtain 3,3-bis(chloro (Methyl) oxetane, the molar ratio of pentaerythritol to thionyl chloride is 1:1.05;

[0059]2) Preparation of modified alcohol amine: add the amine compound to 3,3-bis(chloromethyl)oxetane for 0.5~1h, add sodium azide and stir for 0.5~2h, after purification Add a reducing agent to perform a reduction reaction for 0.5 to 1h to obtain a modified alcohol amine. The molar ratio of the 3,3-bis(chloromethyl)oxetane, organic alcohol amine, sodium azide and the reducing agent is 1:1.05:2.1:0.05;

[0060]3) 40 parts by weight of modified alcohol amine, 80 parts by weight of water reducing agent, 1 part by weight of sodium molybdate, 4 parts by weight of mineral fiber, 0.08 parts by weight of methyl tert-butyl ether, 5 parts by weight The polycarbonate, 0.05 parts by weight of water-retaining agent, 0.04 parts ...

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Abstract

The invention discloses a cement grinding aid and a preparation method thereof. The cement grinding aid comprises, by weight, 20-40 parts of modified alkylol amine, 40-80 parts of a water reducing agent, 0.1-1 part of sodium molybdate, 1-4 parts of a mineral fiber, 0.02-0.08 part of methyl tert-butyl ether, 1-5 parts of polycarbonate, 0.01-0.05 part of a water retaining agent, 0.02-0.04 part of adefoaming agent, and 20-50 parts of water. The grinding aid prepared by the method disclosed by the invention is simple in production process, safe and good in controllability, and has relatively goodcost performance and competitive advantages.

Description

Technical field[0001]The invention relates to the technical field of formulations for construction cement, in particular to a cement grinding aid and a preparation method thereof.Background technique[0002]In cement production, the grinding process is the most energy-consuming link, and the energy utilization rate is extremely low. Only a small part is used to increase the specific surface area of ​​the material. Adding a small amount of grinding aids in the grinding process can significantly improve the grinding efficiency and reduce energy consumption. Cement grinding aids are composed of one or several surface active substances. The application effects of most cement grinding aids show that: cement grinding aids can reduce cement particle size, increase specific surface area, improve certain physical and chemical properties of cement, and reduce powder Abrasion power consumption and other effects. The main theories are: Rebinder's strength weakening theory and Mardulier's particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B24/32C04B24/28C04B24/12C07C213/02C07C215/18C07C247/04C07D305/06C04B103/52
CPCC04B24/122C04B40/0039C04B2103/52C07C213/02C07C247/04C07D305/06C07C215/18C04B2103/302C04B22/08C04B20/0048C04B24/286C04B24/023C04B24/2652C04B2103/50
Inventor 肖学党徐启苍吴涛朱帮坤李桂林
Owner XINYANG LINGSHI TECH CO LTD
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