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Microcapsules for self-repairing of asphalt micro-damage and preparation method of microcapsules

A self-healing microcapsule and micro-damage technology, applied in the field of building materials, can solve problems such as limited self-healing ability, and achieve the effect of enhancing self-healing ability and improving high temperature stability

Inactive Publication Date: 2018-01-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a polymer organic cementing material, asphalt has a certain self-healing ability, but its self-healing ability is relatively limited.

Method used

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  • Microcapsules for self-repairing of asphalt micro-damage and preparation method of microcapsules
  • Microcapsules for self-repairing of asphalt micro-damage and preparation method of microcapsules

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This example is about asphalt micro-damage self-healing microcapsules (core material is asphalt regenerant, wall material is melamine-urea-formaldehyde resin) and its preparation method and performance.

[0029] (1) The raw materials and instruments required for preparation are shown in Table 1 and Table 2.

[0030] Table 1 Raw materials

[0031]

[0032] Table 2 Instruments

[0033]

[0034]

[0035] (2) Melamine, urea, formaldehyde (molar ratio, urea: melamine: formaldehyde = 1:1.9:7.2) were added to 25ml deionized water altogether 5g, and stirred to make the mixture mix evenly, after the urea powder was completely dissolved and disappeared, use The pH value of the mixed solution is adjusted to 8-9 with a 10% NaOH solution, and then the temperature of the mixed solution is slowly raised to 70-80° C. under the condition of 300-500 r / min mechanical stirring and maintained at this temperature for 1 h. After 1 h, the reaction was finished, and the temperature o...

Embodiment 2

[0054] This embodiment is that the core material of the present invention is asphalt rejuvenator, the wall material is melamine-urea-formaldehyde (MUF) resin asphalt micro-damage self-repairing microcapsules and the traditional core material is asphalt rejuvenator, and the wall material is melamine-urea-formaldehyde (MUF) resin. Performance comparison of formaldehyde (MF) resin microcapsules.

[0055] (1) Comparison of thermal stability

[0056] Figure 4 It is a thermogravimetric analysis comparison chart of the microcapsules of the present invention and the MF microcapsules.

[0057] The mixing temperature of hot mix asphalt mixture is close to 180°C. In this high temperature environment, if Figure 4 As shown, the mass loss of microcapsules with melamine-urea-formaldehyde (MUF) resin as wall material is about 4%, and the mass loss of microcapsules with melamine-formaldehyde (MF) resin as wall material is close to 15%. It can be seen that the microcapsules of the present ...

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Abstract

The invention provides microcapsules for the self-repairing of asphalt micro-damage and a preparation method of the microcapsules and relates to the field of building materials. The core material of the microcapsules is an asphalt regenerating agent, and the wall material of the microcapsules is melamine-urea-formaldehyde resin. The preparation method includes: adding melamine, urea and formaldehyde into deionized water, stirring, and regulating pH until the solution is clear and transparent to obtain a prepolymer solution; adding sodium dodecyl sulfate into deionized water, stirring until thesodium dodecyl sulfate is dissolved completely, adding the regenerating agent, performing high-speed shearing and emulsification to obtain a core material emulsion; adding the prepolymer solution into the core material emulsion while stirring, heating at the same time, lowering pH, performing reaction for 4 hours, and increasing pH to end the reaction; allowing a microcapsule suspension to stand,cooling to room temperature, filtering, repeatedly washing with deionized water, and drying to obtain the microcapsules. The microcapsules and the preparation method have the advantages that the microcapsules prepared by an in-situ polymerization method is good in high-temperature stability and mechanical strength and capable of effectively enhancing the self-healing ability of asphalt.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a melamine-urea-formaldehyde microcapsule, which is mainly used for enhancing the self-healing ability of asphalt concrete, and is suitable for the prevention and treatment of asphalt concrete pavement cracking. Background technique [0002] Asphalt aging and fatigue cracking are the main diseases of asphalt pavement, and are the initiators of water seepage, looseness, potholes and even structural damage of asphalt pavement. Asphalt aging and fatigue cracking have always been the focus of research on the road of seeking high-performance and long-life asphalt pavements. At present, technologies such as filling joints, spraying regenerants, and pavement regeneration are commonly used as treatment measures for pavement diseases. Can it be changed from "remedial" maintenance to "precautions" prevention, that is, when the asphalt pavement was born? What about taking "mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/18C08L95/00C08L61/30C08G12/38
Inventor 孙大权李彬田洋孙国强余帆
Owner TONGJI UNIV
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