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Preparation method, application and cement additive of 2.5-dimethylpiperazine derivative

A technology of dimethylpiperazine and cement additives, applied in the field of cement additives, can solve problems such as long process and difficult process control, and achieve the effect of improving early strength, improving quality and reducing dosage

Active Publication Date: 2018-09-21
NANJING BAOCHUN CHEMICAL INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the above-mentioned 2,5-dimethylpiperazine derivatives are all produced by indirect synthesis, which has a long process and difficult process control

Method used

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  • Preparation method, application and cement additive of 2.5-dimethylpiperazine derivative
  • Preparation method, application and cement additive of 2.5-dimethylpiperazine derivative
  • Preparation method, application and cement additive of 2.5-dimethylpiperazine derivative

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The 2,5-dimethylpiperazine derivative is used alone as a cement additive, and when it is used alone as a cement additive, its addition method is the same as that of the existing cement additive.

[0045] 2,5-Dimethylpiperazine derivatives were tested as cement additives, and the test was carried out according to the GB / T 26748-2011 "Cement Grinding Aids" standard. The cement used was the benchmark cement with the following physical properties:

[0046]

[0047] In the cement module test, 2,5-dimethylpiperazine (HDMP), 1,4-bis(2-hydroxyethyl)-2,5-dimethylpiperazine (HEDMP), 1,4-bis (2-Hydroxypropyl)-2,5-dimethylpiperazine (HPDMP) refers to GB / T 17671-1999 "Cement Mortar Strength Test Method", GB / T 1346-2011 "Cement Standard Consistency Water Consumption Test" Method", to detect cement strength and standard consistency water demand, the specific test data are shown in Table 1.

[0048] Table 1 cement strength, standard consistency water demand data table

[0049] ...

Embodiment 2

[0055] The benchmark cement specification and test method in the present embodiment are the same as the benchmark cement specification and test method in Example 1.

[0056] Using 2,5-dimethylpiperazine (HDMP), 1,4-bis(2-hydroxyethyl)-2,5-dimethylpiperazine (HEDMP), 1,4-bis(2-hydroxypropyl Base)-2,5-dimethylpiperazine (HPDMP) is used as a cement additive alone, and the dosage is 0.04% of the cement mass. The specific test data are shown in Table 2.

[0057] Table 2 cement strength, standard consistency water demand data table

[0058]

[0059] "+" in Table 2 indicates that the compressive strength increases.

[0060] The data in Table 2 show that 2,5-dimethylpiperazine and its derivatives have the application characteristics of additives; compared with the blank cement sample, it is found that only 0.04% of the dosage is added to greatly improve the early and late strength of cement and reduce the Water requirement for standard consistency of cement. Among them, the maxi...

Embodiment 3

[0062] The benchmark cement specification and test method in the present embodiment are the same as the benchmark cement specification and test method in Example 1.

[0063] The material mix ratio of cement is: clinker 84%, gypsum 5%, limestone 4%, slag 2%, black slag 2%, iron slag 3%. Grinding fineness (0.08 / %) is 1.1, specific surface area (m 2 / kg) was 452, and the standard consistency (%) was 27.5.

[0064] Triethanolamine (TEA), 1,4-bis(2-hydroxyethyl)-2,5-dimethylpiperazine (HEDMP), 1,4-bis(2-hydroxypropyl)-2,5-bis Methylpiperazine (HPDMP) is used alone as a cement additive, and the dosage is 0.02% of the cement mass. See Table 3 for specific testing data.

[0065] Table 3 cement strength, standard consistency water demand data table

[0066]

[0067]

[0068] "+" in Table 3 indicates that the compressive strength increases.

[0069] The data in Table 3 shows that when the dosage is 0.02%, compared with the blank cement sample, it is found that the water deman...

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Abstract

The invention discloses 2.5-dimethylpiperazine derivatives are used as cement additives. In this application, the 2.5- dimethyl piperazine derivative has the advantages of being able to be used aloneor in combination with other kinds of cement additives to form a cement composite additive, and has a stronger synergistic effect, and can take the advantages of various cement additives, minimize thedosage of cement additives, and improve the quality of cement products. When the doping amount is not changed, the cement additive of the invention can improve the early strength of the cement compared with the hydroxyalkyl amine, thereby effectively improving the construction efficiency of the cement product. The invention further discloses a method for preparing 2.5- dimethylpiperazine derivatives. The preparation method has the advantages of flow reduction. In this application, a cement additive formed using the2.5-dimethylpiperazine derivatives prepared by the above-described method is also disclosed. The cement additive can effectively improve the construction efficiency of cement products.

Description

technical field [0001] The invention belongs to the field of chemical industry, and specifically relates to the application of 2,5-dimethylpiperazine derivatives as cement additives and the preparation method of 2,5-dimethylpiperazine derivatives, and the cement prepared by the above preparation method additive. Background technique [0002] Cement additive is a chemical additive to improve the grinding effect and performance of cement, and it is composed of one or several surface active substances. It can not only significantly increase the output per hour of the cement table, the strength of cement of all ages, and improve its fluidity, but also greatly reduce the phenomenon of electrostatic adsorption and ball formation during the grinding process, and can reduce the particle size of the ultrafine particles formed during the grinding process. The trend is coalescing again. At the same time, it plays a very important role in reducing energy consumption and production cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C07D241/04
CPCC04B24/128C07D241/04
Inventor 李国华杭建荣陈云龙张书
Owner NANJING BAOCHUN CHEMICAL INDUSTRY CO LTD
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