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Core-shell type particle as well as preparation method and application thereof

A technology of core-shell type and particles, which is applied in the field of core-shell particles and its preparation, which can solve the problem of unstable improvement of the crack resistance of cement-based materials, the inability to significantly improve the crack resistance of cement-based materials, and the crack resistance of cement-based materials Improve the stability of the interface bonding, the effect of flexible deformation energy absorption is significant, and the crack resistance performance is improved.

Active Publication Date: 2022-07-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fiber toughening mainly works on cracks of tens of microns or even millimeters. It is difficult to effectively avoid the formation and initial expansion of micro cracks, and it may even further accelerate the migration of external ions due to the multi-slit cracking effect.
When the organic polymer polymerizes to form a cross-linked network, it will coat the active gelling component, which will affect the hydration and microstructure development of the cement-based material. In addition, the organic polymer will also emulsify and depolymerize in a high alkaline environment. , will not only lead to a decrease in the compressive strength of the cement-based material, but also cause instability in the improvement effect of the crack resistance of the cement-based material
The simple introduction of auxiliary cementitious materials cannot change the brittle nature of the slurry, and the improvement in the crack resistance of cement-based materials is small
In summary, none of the existing methods can significantly improve the crack resistance of cement-based materials.

Method used

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  • Core-shell type particle as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A core-shell particle, its preparation method comprises the following steps:

[0045] 1) Mix 10 parts by mass of gelatin (number-average molecular weight is 35000 g / mol), 0.2 parts by mass of dicyclopentadienyl acrylate and 10 parts by mass of deionized water (conductivity is less than 0.5us / cm), at 50° C. Stirring at constant temperature for 2 h to obtain a hydrogel precursor;

[0046] 2) adding 10 mass parts of zeolite particles (particle diameter is less than 50 μm, median particle diameter is 30 μm) into 50 mL of sodium acetate solution with a concentration of 0.5 mol / L, stirring for 15 min, then microwave heating for 10 min, microwave power is 343W, naturally Cooling, then washing with water, suction filtration and drying (to constant weight) to obtain modified zeolite particles;

[0047] 3) The modified zeolite particles were added to the hydrogel precursor, stirred for 6 hours, and then the gelled modified zeolite particles were soaked in 40 mL of a tannin solut...

Embodiment 2

[0051] A core-shell particle, its preparation method comprises the following steps:

[0052] 1) Mix 15 parts by mass of gelatin (number average molecular weight is 50000g / mol), 0.28 parts by mass of glutaraldehyde and 10 parts by mass of deionized water (conductivity is less than 0.5us / cm), and stir at a constant temperature for 3h at 55°C , to obtain a hydrogel precursor;

[0053] 2) adding 10 mass parts of zeolite particles (particle diameter is less than 50 μm, and median particle diameter is 35 μm) into the sodium chloride solution that the concentration of 50 mL is 1.0 mol / L, stirred for 25 min, and then microwaved for 20 min, and the microwave power was 350W, Natural cooling, washing with water, suction filtration and drying (to constant weight) to obtain modified zeolite particles;

[0054] 3) The modified zeolite particles were added to the hydrogel precursor, stirred for 6 hours, and then the gelled modified zeolite particles were soaked in 35 mL of tannin solution w...

Embodiment 3

[0058] A core-shell particle, its preparation method comprises the following steps:

[0059] 1) Mix 5 parts by mass of gelatin (number average molecular weight is 80000g / mol), 0.35 parts by mass of dicyclopentadienyl acrylate and 10 parts by mass of deionized water (conductivity is less than 0.5us / cm), at 65° C. Stirring at constant temperature for 2 h to obtain a hydrogel precursor;

[0060] 2) adding 10 mass parts of zeolite particles (particle diameter is less than 50 μm, and median particle diameter is 28 μm) into the lithium chloride solution that the concentration of 30 mL is 3.0 mol / L, stirring for 15 min, and then microwave heating for 15 min, and the microwave power is 343W, Natural cooling, washing with water, suction filtration and drying (to constant weight) to obtain modified zeolite particles;

[0061] 3) The modified zeolite particles were added to the hydrogel precursor, stirred for 6 h, and then the gelled modified zeolite particles were soaked in 30 mL of a ...

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Abstract

The invention discloses a core-shell type particle as well as a preparation method and application thereof. The core-shell type particle provided by the invention comprises the following preparation raw materials in parts by mass: 100 parts of porous particles; 8 to 300 parts of gelatin; 0.01 to 10 parts of a cross-linking agent; and 1.6 to 300 parts of water. The preparation method of the core-shell type particles comprises the following steps: 1) dispersing gelatin and a cross-linking agent in water to prepare a hydrogel precursor, and dispersing porous particles in a modifier solution for microwave heating to prepare modified porous particles; and 2) adding the modified porous particles into a hydrogel precursor for gelation, soaking the gelated porous particles in a tannic acid solution, cleaning and drying to obtain the core-shell type particles. The core-shell type particle provided by the invention has a rigid core and a flexible shell, so that the anti-cracking performance of a cement-based material can be remarkably improved, and improvement of durability of a building material and reduction of environmental load in the whole life cycle are facilitated.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a core-shell particle and a preparation method and application thereof. Background technique [0002] Buildings generally need to be repaired several times during the entire service process, and there are even cases where the building has to be demolished before the designed service life due to the serious deterioration of the performance of cement-based building materials, which will greatly increase the whole life cycle of the building structure. resources and energy consumption, but also increase the environmental load. The root cause of insufficient durability of cement-based materials lies in their high brittleness and poor crack resistance. Under the action of stress, micro-cracks are easily generated and expanded, which will accelerate the invasion of external erosive media and microstructure damage. [0003] At present, the composition of hydration products of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B14/04C04B28/04
CPCC04B20/1048C04B20/1018C04B14/047C04B28/04C04B2111/343C04B2201/50C04B14/06Y02W30/91
Inventor 郭奕群张同生黄迎慧王涛马婷韦江雄余其俊
Owner SOUTH CHINA UNIV OF TECH
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