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A kind of accelerator and preparation method thereof

A technology of early strength agent and catalyst, which is applied in the field of early strength agent and its preparation, which can solve the problems of early strength improvement of cement, which cannot be achieved, and cannot meet the actual needs of users, and achieve significant application prospects and the effect of early strength improvement

Active Publication Date: 2022-05-17
GUIZHOU KEZHIJIE NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the early strength agent is added to the cement to make the cement harden rapidly and increase the early strength of the cement. However, as the national railway has higher and higher requirements for the quality of tunnel engineering, the requirements for the early strength agent in railway tunnel engineering are also getting higher and higher. Come higher, on March 31, 2021, the railway tunnel project began to implement Q / CR 807-2020, Q / CR 807-2020 requires the compressive strength of cement to reach 1MPa or more in 6 hours, and the compressive strength in one day to reach 10MPa or more. The use of early strength agents currently on the market does not improve the early strength of cement enough to meet the standard requirements of Q / CR 807-2020 and cannot meet the actual needs of users

Method used

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  • A kind of accelerator and preparation method thereof
  • A kind of accelerator and preparation method thereof
  • A kind of accelerator and preparation method thereof

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preparation example Construction

[0051] The embodiment of the present application also provides a preparation method of an early strengthening agent, the preparation method comprising the following steps:

[0052] S100, adding 10-15 parts by weight of organic solvent and 30-50 parts by weight of water into the reaction kettle;

[0053] S200, adding 12 to 16 parts by weight of benzoic acid substances and 1 to 2 parts by weight of catalyst in the reaction kettle;

[0054] S300, adding 10 to 12 parts by weight of an intermediate in the reaction kettle, and reacting the intermediate with the benzoic acid to prepare the acid chloride;

[0055] S400, adding 24 to 30 parts by weight of aniline substances and catalysts into the reaction kettle, acylating the acyl chlorides and aniline substances to prepare the early strength agent, wherein the catalyst added to the reaction kettle includes 2 to 4 parts by weight share.

[0056] In one embodiment, the catalyst includes a first catalyst and a second catalyst, and the...

Embodiment 1

[0073] Dissolve 1 part of dimethylformamide in 10 parts of water to make a dimethylformamide solution for use, feed N2 into the reactor, and in parts by weight, add: 12 parts of toluene, 28 parts of water , 12 parts of methyl benzoic acid, adjust the temperature in the reactor to 45°C, after the methyl benzoic acid is completely dissolved, add the prepared dimethylformamide solution dropwise into the reactor, after 5min, in the reactor Add 11 parts of thionyl chloride dropwise to the solution, the time for adding thionyl chloride is 1h, and then keep warm for 2h.

[0074] Adjust the temperature in the reactor to -25°C, add 24 parts of methylaniline and 2 parts of sulfuric acid into the reactor, and react for 4 hours to obtain the accelerator.

Embodiment 2

[0076] Dissolve 1 part of triethylamine in 10 parts of water to make a triethylamine solution for use, feed N2 in the reactor, and in parts by weight, add in the reactor: 13 parts of ether, 20 parts of water, 14 parts of benzoic acid part, adjust the temperature in the reaction kettle to 40°C, and after the benzoic acid is completely dissolved, add the prepared triethylamine solution dropwise into the reaction kettle, and after 3 minutes, add 12 parts of thionyl chloride dropwise into the reaction kettle, The dropwise addition time of thionyl chloride was 1 h, followed by incubation for 4 h.

[0077] Adjust the temperature in the reactor to -10°C, add 28 parts of ethylaniline and 2 parts of sulfuric acid into the reactor, and react for 6 hours to obtain the accelerator.

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Abstract

The application discloses an early strength agent and a preparation method thereof. An early strength agent includes, in parts by weight: 24 to 30 parts by weight of aniline substances, 12 to 16 parts by weight of benzoic acid substances, 10 to 12 parts by weight The intermediate of 2~4 parts by weight, the catalyst of 2~4 parts by weight, the organic solvent of 10~15 parts by weight and the water of 30~50 parts by weight, the early strength agent of the present application, compares with prior art, by above-mentioned each component collocation The early-strength agent can improve the early strength of cement very well, and the cement that has used the early-strength agent of the present application can reach the requirement of Q / CR 807-2020 of railway tunnel engineering in every index, and has remarkable effect in railway tunnel engineering application prospects.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to an accelerator and a preparation method thereof. Background technique [0002] In the prior art, the early strength agent is added to the cement to make the cement harden rapidly and improve the early strength of the cement. However, as the national railway has higher and higher requirements for the quality of tunnel engineering, the requirements for the early strength agent in railway tunnel engineering are also getting higher and higher. Going higher, on March 31, 2021, the railway tunnel project began to implement Q / CR 807-2020, Q / CR 807-2020 requires that the compressive strength of cement should reach 1MPa or more in 6 hours, and the compressive strength of cement should reach 10MPa or more in one day. The use of early strength agents currently on the market does not improve the early strength of cement enough to meet the standard requirements of Q / CR 807-2020 and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B24/04C04B103/10
CPCC04B40/0039C04B2103/10C04B24/121C04B24/04C04B24/16C04B24/124C04B24/023C04B22/141C04B24/005C04B22/12C04B22/126Y02W30/91
Inventor 蒋禹邓磊陈文红谢大银
Owner GUIZHOU KEZHIJIE NEW MATERIAL
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