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Twin-type concrete air-entraining agent and its preparation method

The technology of concrete and air-entraining agent is applied in the direction of sulfonate preparation, carboxylate preparation, chemical instruments and methods, etc. It can solve the problems of harsh reaction conditions and complex structure, and achieve simple and effective production process, good compound performance, The effect of enhanced stability

Active Publication Date: 2022-04-08
山东建科建筑材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of the existing concrete air-entraining agent, complex structure and harsh reaction conditions, the invention discloses a twin-type concrete air-entraining agent and its preparation method

Method used

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  • Twin-type concrete air-entraining agent and its preparation method
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  • Twin-type concrete air-entraining agent and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: a kind of preparation method of twin type concrete air-entraining agent, it comprises the steps:

[0034] Step (1): Add 1.0mol (262g) C1 and 1.0mol (98g) maleic anhydride at 40°C, add 5.24g anhydrous sodium acetate, and stir for 3 hours to obtain maleic anhydride fatty alcohol polyoxyethylene ethers monoester.

[0035] Step (2): Heat up to 130°C, add 0.50mol (31g) D1, continue to heat up to 150°C, keep the vacuum less than 0.2 MPa, and stir for 6 hours.

[0036] Step (3): Lower the temperature, control the temperature at 100°C, add 1.0mol (104g) sodium bisulfite, 8.82g octadecyltrimethylammonium bromide and water, and stir for 2 hours. The obtained product was dissolved in water and adjusted to a solution with a solid content of 50%. It is the twin-type concrete air-entraining agent of the present invention.

[0037] The air-entraining agent was diluted to 5%, and the surface tension of the solution was measured to be 31.2 mN / m.

Embodiment 2

[0038] Embodiment 2: a kind of preparation method of twin-type concrete air-entraining agent, it comprises the steps:

[0039] Step (1): Add 1.15mol (365.7g) of C2 and 1.0mol (98g) of maleic anhydride at 90°C, add 10.97g of p-toluenesulfonic acid, and stir for 2 hours to obtain maleic anhydride fatty alcohol polyoxygen Vinyl ether monoester.

[0040] Step (2): Heat up to 120°C, add 0.55mol (49.5g) D2, continue to heat up to 150°C, keep vacuum less than 0.2 MPa, and stir for 6 hours.

[0041] Step (3): Lower the temperature, control the temperature at 90°C, add 1.1mol (114.4g) of sodium bisulfite, 9.8g of cetyltrimethylammonium bromide and water, and stir for 1.5 hours to react. The obtained product was dissolved in water and adjusted to a solution with a solid content of 40%. It is the twin-type concrete air-entraining agent of the present invention.

[0042] The air-entraining agent was diluted to 5%, and the surface tension of the solution was measured to be 30.5 mN / m.

Embodiment 3

[0043] Embodiment 3: a kind of preparation method of twin-type concrete air-entraining agent, it comprises the steps:

[0044] Step (1): Add 1.2mol (607.2g) of C3 and 1.0mol (98g) of maleic anhydride at 80°C, add 24.29g of concentrated sulfuric acid, and stir for 1 hour to obtain maleic anhydride fatty alcohol polyoxyethylene ethers ester.

[0045] Step (2): Heat up to 125°C, add 0.60mol (66g) of D3, continue to heat up to 140°C, keep the vacuum less than 0.2 MPa, and stir for 4 hours.

[0046]Step (3): Lower the temperature, control the temperature at 85°C, add 1.2mol (124.8g) sodium bisulfite, 11.76g tetradecyltrimethylammonium bromide and water, and stir for 1 hour. The obtained product was dissolved in water and adjusted to a solution with a solid content of 30%. It is the twin-type concrete air-entraining agent of the present invention.

[0047] The air-entraining agent was diluted to 5%, and the measured surface tension of the solution was 30.8 mN / m.

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Abstract

The invention discloses a twin-type concrete air-entraining agent and a preparation method thereof. The chemical structure of the gemini-type concrete air-entraining agent belongs to the gemini-type surfactant and has higher surface activity. Gemini-type concrete air-entraining agent is added to concrete to produce uniform fine air bubbles. When the air content of concrete is 4.5-5.0%, the air content basically remains unchanged within 1 hour, and the average chord length of hardened concrete bubbles is between 120-150 μm. The uniform and fine air bubbles not only have a certain insulation effect, but more importantly, they can buffer the expansion stress generated by the frozen water, thereby reducing the freezing damage of concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a concrete air-entraining agent capable of significantly improving the durability of concrete and a preparation method thereof. Background technique [0002] Concrete air-entraining agent is widely used in concrete as an important independent species of concrete admixture. It can significantly improve the workability and homogeneity of freshly mixed concrete, and can improve the comprehensive durability of concrete. [0003] Currently commonly used concrete air-entraining agents include: rosin resins, alkyl and alkyl aromatic hydrocarbon sulfonic acids, fatty alcohol sulfonates, saponins, protein salts, petroleum sulfonic acid hydrochloric acid, etc. From the perspective of chemical structure, the above-mentioned air-entraining agents are all traditional single-chain surfactants, that is, amphiphilic molecules with a hydrophilic group at one end and a hydr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/17C07C303/32C09K23/10C09K23/16C04B24/16C04B103/30
CPCC07C309/17C07C303/32C07C67/08C07C291/04C04B24/16C04B2103/304C07C69/60Y02W30/91
Inventor 王立亚蔡贵生鲁统卫孙璐王开宇徐磊郭向阳宋西成赵法国
Owner 山东建科建筑材料有限公司
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