Synthesis and self-healing properties of composite microcapsule based on sodium alginate/melamine-phenol–formaldehyde resin

Jiang, Wenjing; Zhou, Gang; Wang, Cunmin; Xue, Yifang; Niu, Chenxi

doi:10.1016/j.conbuildmat.2020.121541

Cited by 62 publications

(22 citation statements)

References 52 publications

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“…With low price, excellent mechanical properties and thermal stability, the melamine resin is often used as wall material of microcapsules [18][19][20]. The rice husk powder, as a natural material, which is rich in plant fibers, has excellent toughness [21].…”

Section: Introductionmentioning

confidence: 99%

Coating Process Optimization and Self-Healing Performance Evaluation of Shellac Microcapsules Coated with Melamine/Rice Husk Powder

Yan

Yin

2021

Applied Sciences

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To explore the implication of the coating process on the comprehensive properties of water-based coating containing shellac microcapsules coated with melamine/rice husk powder on the Tilia cordata surface, the optical properties, mechanical properties, liquid resistance, aging resistance, chemical composition, and microstructure of the coating were analyzed comprehensively. After the best coating process was determined, compared with the coating without microcapsules, the self-repairing performance of the water-based coating containing shellac microcapsules coated with melamine/rice husk powder was explored via aging resistance test and scratch test. The results showed that the best comprehensive performance of the coating was obtained by three times primer, two times finish, and 6.0% shellac microcapsules coated with melamine/rice husk powder added in the primer. The coating with shellac microcapsules had significant stability, aging resistance, and self-healing performance, which can repair cracks in a certain period of time and inhibit the formation of cracks. At the core wall ratio of 0.75, the shellac which plays a role of the repair agent as the core material can effectively fill the microcracks in the coating to repair by flowing from the broken microcapsule because it can be physically cured at room temperature. The modification of waterborne coatings with shellac microcapsules coated with melamine/rice husk powder contributes the improved self-repairing properties of surface coatings containing heterogeneous natural polymer composites.

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Section: Introductionmentioning

confidence: 99%

Coating Process Optimization and Self-Healing Performance Evaluation of Shellac Microcapsules Coated with Melamine/Rice Husk Powder

Yan

Yin

2021

Applied Sciences

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“…High concentrations of dust can cause pneumoconiosis, reduce the accuracy of instrument work, and cause coal and gas explosions, threatening the physical and mental health of workers 1 – 4 . According to incomplete statistics, by the end of 2021 China had 11,809 cases of pneumoconiosis, and between 2010 and 2021, accounting for the total occupational pneumoconiosis are as high as 80% a year, more than 50% by coal dust induced 5 , 6 (Fig. 1 ).…”

Section: Introductionmentioning

confidence: 99%

Research on dust dispersion law of fully mechanized mining faces under different inclinations and tracking closed dust control method

Zhou

Kong

Meng

et al. 2022

Sci Rep

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Based on the gas–solid two-phase flow theory, numerical simulation of the dust dispersion law of fully mechanized mining work under different inclination angles and comparative analysis of field-measured data show that with the increase of working face inclination, the inclination of airflow into the unmined zone increases from 25° to 50° and the maximum wind speed increases from 2.16 to 2.25 m/s after the mixing of cutting turbulent wind and system ventilation. Meanwhile, the range of high-concentration dust clusters, suspension time, lateral migration intensity, and deposition zone increase to varying degrees; dust clusters increases from 62.02 to 202.46 m3. When X < 53.96 m, the dust concentration in the sidewalk-breathing zone shows a sine function with the length of the working face, and when X ≥ 53.96 m, it satisfies the exponential decay function. Based on this, the tracking closed dust control technology is proposed. Combining the offset angle of the airflow and t the gathering position of dust mass, the wind curtain angle and air velocity are automatically controlled to ensure that the dust is restricted to one side of the cable trough.

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“…After curing, it can form a solid polymer with a three-dimensional network structure and has excellent mechanical properties. The preparation of epoxy resin self-healing microcapsules is of substantial application value for repairing the microcracks of cement-based materials. − Many studies have been conducted on urea–formaldehyde/epoxy microcapsules, melamine/epoxy microcapsules, and phenolic/epoxy microcapsules, among others. − These microcapsules are of fracture-release type, and, inevitably, formaldehyde is used as a raw material in the production of the wall material. Formaldehyde is easily released during use and causes substantial damage to the human body, which limits the wide application of self-healing microcapsules. − Moreover, the fracture release of the microcapsules must reach a mechanical trigger point to promote the rupture of the microcapsules, and their repair performance and stability are not ideal.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Multifunctional Sustained-Release Organic–Inorganic Hybrid Microcapsule with Self-Healing and Flame-Retardancy Properties

Jiang

Zhou

Duan

et al. 2021

ACS Appl. Mater. Interfaces

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As their service life increases, cement-based materials inevitably undergo microcracking and local damage. In response to this problem, this study used phacoemulsification-solvent volatilization to prepare a multifunctional sustained-release microcapsule (SFRM) with selfhealing and flame-retardant characteristics. The synthesis of SFRM is based on the modification of ethyl cellulose with nano-SiO 2 particles and crosslinking with a silane coupling agent to form an organic−inorganic hybrid wall material. The epoxy resin is blended with hexaphenoxy cyclotriphosphazene (HPCTP) to form a composite core emulsion. The surface morphology, particle size distribution, core−shell composition, and thermal stability of SFRM were analyzed via scanning electron microscopy (SEM), energy-dispersive spectrometry (EDS), Malvern, Fourier-transform infrared (FT-IR), and TD-DSC-DTG. It is concluded that SFRM was successfully synthesized with superior particle size distribution and thermal stability. When the ratio of SiO 2 solution and EC alcohol solution reached 1:2, the particle size distribution of the microcapsules was 30−190 μm, and the D 50 decreased to 70 μm. The core material content, slow-release performance, and flame retardancy of SFRM were measured using a UV-1800 spectrophotometer and Hartmann tubes, and the compressive and repair properties of SFRM were evaluated by uniaxial compression tests. The results demonstrate that SFRM has satisfactory slow-release and flame-retardancy properties, the LC is 67%, and the first-order kinetic model shows the best fit and conforms to the non-Fickian diffusion mechanism. The SFRM repair rate can reach approximately 61%. This is of substantial significance to the field of self-repairing cement-based materials.

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Synthesis and self-healing properties of composite microcapsule based on sodium alginate/melamine-phenol–formaldehyde resin

Cited by 62 publications

References 52 publications

Coating Process Optimization and Self-Healing Performance Evaluation of Shellac Microcapsules Coated with Melamine/Rice Husk Powder

Coating Process Optimization and Self-Healing Performance Evaluation of Shellac Microcapsules Coated with Melamine/Rice Husk Powder

Research on dust dispersion law of fully mechanized mining faces under different inclinations and tracking closed dust control method

Synthesis and Characterization of a Multifunctional Sustained-Release Organic–Inorganic Hybrid Microcapsule with Self-Healing and Flame-Retardancy Properties

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Synthesis and self-healing properties of composite microcapsule based on sodium alginate/melamine-phenol–formaldehyde resin

Cited by 62 publications

References 52 publications

Coating Process Optimization and Self-Healing Performance Evaluation of Shellac Microcapsules Coated with Melamine/Rice Husk Powder

Coating Process Optimization and Self-Healing Performance Evaluation of Shellac Microcapsules Coated with Melamine/Rice Husk Powder

Res﻿earch on dust dispersion law of fully mechanized mining faces under different inclinations and tracking closed dust control method

Synthesis and Characterization of a Multifunctional Sustained-Release Organic–Inorganic Hybrid Microcapsule with Self-Healing and Flame-Retardancy Properties

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Product

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Research on dust dispersion law of fully mechanized mining faces under different inclinations and tracking closed dust control method