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Slow-release hydrophobic agent for cement-based materials, hydrophobic cement and preparation method thereof

A technology of cement-based material and hydrophobic agent, applied in the field of slow-release hydrophobic agent, can solve the problems of high cost and complicated operation, and achieve the effect of improving compactness, less dosage and low economic cost

Active Publication Date: 2022-03-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Purpose of the invention: In view of the existing methods for improving the ability of cement-based materials to resist moisture intrusion, which affect the progress of cement hydration, complicated operation, and high cost, the present invention provides a cement-based material with less impact on the cement hydration process. release hydrophobic agent, and provide a hydrophobic cement containing the slow-release hydrophobic agent, also provides a preparation method of the hydrophobic cement

Method used

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  • Slow-release hydrophobic agent for cement-based materials, hydrophobic cement and preparation method thereof
  • Slow-release hydrophobic agent for cement-based materials, hydrophobic cement and preparation method thereof
  • Slow-release hydrophobic agent for cement-based materials, hydrophobic cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 1 part of fluorosilane and 1 part of alkyl siloxane to 100 parts of absolute ethanol to obtain the soaking solution of floating beads. Mix 2 parts of ammonium fluoride and 65 parts of dilute hydrochloric acid to prepare an acid etching solution for etching floating beads. Add 3 parts of floating beads to the mixed solution and soak for 6 hours; Soak in water for 1d; filter and dry the floating beads in clear water at 60°C, put the floating beads in the soaking solution, soak in a vacuum of 80Kpa for 1d, and then place the floating beads in 6 parts of silica sol for soaking after suction filtration After 4 hours, dry in a drying oven at 60°C for 1 day to obtain modified floating beads.

[0029] The above-mentioned modified floating beads are used as raw materials to prepare hydrophobic cement doped with 5% and 10% slow-release hydrophobic agents. The preparation process is as follows:

[0030] Weigh 20 parts of cement and 30 parts of fine sand, add modified floating...

Embodiment 2

[0032]Add 1 part of fluorosilane and 1 part of alkyl siloxane to 50 parts of absolute ethanol to obtain the soaking solution of floating beads. Mix 2 parts of ammonium fluoride and 65 parts of dilute hydrochloric acid to prepare an acid etching solution for etching floating beads. Add 3 parts of floating beads to the mixed solution and soak for 10 hours; Soak in water for 1d; filter and dry the floating beads in clear water at 70°C, put the floating beads in the soaking solution, soak in a vacuum of 100Kpa for 1d, and then place the floating beads in 10 parts of silica sol for soaking after suction filtration 6h, dry in a drying oven at 70°C for 1d to obtain modified floating beads.

[0033] The above-mentioned modified floating beads are used as raw materials to prepare hydrophobic cement doped with 15% slow-release hydrophobic agent. The preparation process is as follows:

[0034] Weigh 20 parts of cement and 30 parts of fine sand, and add modified floating beads with a mas...

Embodiment 3

[0036] Add 1 part of fluorosilane and 1 part of alkyl siloxane into 80 parts of absolute ethanol to obtain the soaking solution of floating beads. Mix 2 parts of ammonium fluoride and 65 parts of dilute hydrochloric acid to prepare an acid etching solution for etching floating beads. Add 3 parts of floating beads to the mixed solution and soak for 8 hours; Soak in water for 1d; filter and dry the floating beads in clear water at 60°C, put the floating beads in the soaking solution, soak in a vacuum of 60Kpa for 2d, and then place the floating beads in 8 parts of silica sol for 5 hours after suction filtration , dried in a drying oven at 60°C for 1 day to obtain modified floating beads.

[0037] The above-mentioned modified floating beads are used as raw materials to prepare hydrophobic cement doped with 15% slow-release hydrophobic agent. The preparation process is as follows:

[0038] Weigh 20 parts of cement and 30 parts of fine sand, and add modified floating beads with a ...

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Abstract

The invention discloses a slow-release hydrophobic agent for cement-based materials, hydrophobic cement and a preparation method thereof. The slow-release hydrophobic agent for cement-based materials is a modified floating bead whose surface is coated with a sealant and which stores a hydrophobic modifier inside. Hydrophobic cement of the present invention comprises cement, fine sand, water and slow-release hydrophobic agent, wherein, the mass ratio of cement and fine sand is 2:3, and the ratio of slow-release hydrophobic agent to cement mass is 1:20~3:20, The water-solid ratio is 0.4. Its preparation method: weigh cement and fine sand, add slow-release hydrophobic agent, mix and stir at a low speed of 100-500rpm for 2-3 minutes, then add water, first stir at a low speed of 100-500rpm for 1-2 minutes, then stir at a high speed of 1000-2000rpm for 2-3 minutes , to obtain a hydrophobic cement paste. Floating beads are hollow balls with thin walls and the main components are silica and aluminum oxide. They are similar to cement components and can participate in cement hydration. The modified floating beads store a hydrophobic modifier inside, which can participate in cement water. After the hydration reaction, the hydrophobic modifier is released, and the effect on the cement hydration process is weakened while hydrophobic.

Description

technical field [0001] The invention relates to a slow-release hydrophobic agent, hydrophobic cement containing the slow-release hydrophobic agent and a preparation method of the hydrophobic cement, belonging to the technical field of new construction engineering materials. Background technique [0002] Cement-based materials are the most widely used building materials today. Whether it is military, industrial or civil buildings, the use of cement-based materials is inseparable. Due to the vast territory of our country, the complex terrain and environment, and the continuous coastline, the use of cement-based materials will inevitably be affected by a series of harsh environments such as oceans, salt lakes, and freezing and thawing. The cement-based material is a porous hydrophilic material. Under harsh environments, various corrosive ions easily enter the interior of the cement-based material with the penetration of water, causing damage and deterioration of the cement. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/08C04B20/02C04B20/10C04B28/02C04B103/65C04B111/27
CPCC04B40/0039C04B20/023C04B20/1066C04B28/02C04B2111/27C04B18/08C04B2103/65C04B20/002C04B14/06Y02W30/91
Inventor 郭丽萍费香鹏赵翎亦曹园章丁聪
Owner SOUTHEAST UNIV
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