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Early strength agent and preparation method thereof

A technology of early-strength agent and catalyst, applied in the field of early-strength agent and its preparation, can solve the problems of improving the early strength of cement, unable to achieve, unable to meet the actual needs of users, etc., and achieve the effect of improving early strength and significant application prospects.

Active Publication Date: 2021-10-29
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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  • Early strength agent 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 reactor;

[0054] S300, adding 10 to 12 parts by weight of the intermediate in the reactor, the intermediate reacts with the benzoic acid to obtain 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 first catalyst is dif...

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 into the reactor, and in parts by weight, add: 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 invention discloses an early strength agent and a preparation method thereof. The early strength agent is prepared from, by weight, 24-30 parts of aniline substances, 12-16 parts of benzoic acid substances, 10-12 parts of an intermediate, 2-4 parts of a catalyst, 10-15 parts of an organic solvent and 30-50 parts of water. Compared with the prior art, the early strength agent prepared from the components can well improve the early strength of cement, all indexes of the cement using the early strength agent can meet the requirements of Q / CR 807-2020 of railway tunnel engineering, and the early strength agent has a remarkable application prospect in the railway tunnel engineering.

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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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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