Preparation of Melamine/Rice Husk Powder Coated Shellac Microcapsules and Effect of Different Rice Husk Powder Content in Wall Material on Properties of Wood Waterborne Primer

The melamine/rice husk powder-coated shellac microcapsules were prepared by in-situ polymerization with melamine resin mixed with rice husk powder as microcapsule wall material and shellac as microcapsule core material. The effect of the addition amount of microcapsules with different wall material ratios on the performance of wood waterborne primer coating was investigated. The results show that the most important factor affecting the performance of microcapsules is the content of rice husk powder. Through the preparation and analysis of shellac microcapsule primer coating coated with melamine/rice husk powder, when the content of microcapsule powder is 0–6%, it has little effect on the optical properties of wood waterborne primer coating, and the microcapsule with 5.5% rice husk powder has little effect on the color difference of primer coating. The coating hardness increases with the increase of rice husk powder content in wall material. When the rice husk powder content in wall material is more than 5.5%, the coating hardness reaches the best. When the content of microcapsule powder is 3.0–9.0%, the adhesion of the coating is better, and the coating with rice husk powder content of 5.5% in microcapsule wall material has better impact resistance. When the content of rice husk powder was 5.5% and the content of microcapsule powder was 6%, the elongation at break of the primer coating was the highest and the tensile resistance was the best. The composition of wood waterborne primer did not change after adding microcapsule. The water-based primer with microcapsule has better aging resistance. The water-based primer coating with rice husk powder content of 5.5% and the addition amount of 6% had the best comprehensive performance, which lays the technical reference for the toughness and self-repairing of the waterborne wood coatings.

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Preparation and Performance of Thermochromic and Self-Repairing Dual Function Paint Film with Lac Resin Microcapsules and Fluorane Microcapsules

Polymers ◽

10.3390/polym13183109 ◽

2021 ◽

Vol 13 (18) ◽

pp. 3109

Author(s):

Xiaoxing Yan ◽

Wenting Zhao ◽

Lin Wang

Keyword(s):

In Situ Polymerization ◽

Urea Formaldehyde ◽

Paint Film ◽

Impact Resistance ◽

Core Material ◽

Wall Material ◽

Formaldehyde Resin ◽

Dual Function ◽

Aging Resistance ◽

Water Based

Microcapsules with lac resin as the core material and urea-formaldehyde resin as the wall material were prepared by in situ polymerization, and then the lac resin microcapsules and fluorane microcapsules were added into a water-based primer or topcoat, respectively, to prepare water-based coatings with dual functions of thermochromic and self-repair. The effects of different methods of adding microcapsules on the optical properties, mechanical properties, self-repairing properties, and the aging resistance of water-based paint film were investigated, so as to prepare water-based paint film with the best discoloration and self-repairing functions. The results showed that the paint film with 10.0% fluorane microcapsules in the topcoat and 5.0% lac resin microcapsules in the primer had better comprehensive properties, and the paint film changed from yellow to colorless at 32 °C, with a color difference of 68.9, hardness of 3H, adhesion grade of 0, impact resistance of 13.0 kg∙cm, and elongation at break of 20.0%. The resistance of the paint film to NaCl, ethanol, and detergent was grade 2, with slight discontinuous marks, and the resistance to red ink was grade 3, with slight marks. The lac resin microcapsules have good aging resistance, which can enhance the aging resistance of the paint film with fluorane microcapsules. The gap width of the paint film was repaired by 2.1 µm, the self-repairing rate was 12.3%, and the paint film with lac resin microcapsules had a better crack inhibition effect. The results have provided a reference for multifunctional wood coatings.

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Preparation and Self-Repairing Properties of MF-Coated Shellac Water-Based Microcapsules

Coatings ◽

10.3390/coatings10080778 ◽

2020 ◽

Vol 10 (8) ◽

pp. 778 ◽

Cited By ~ 2

Author(s):

Yijuan Chang ◽

Xiaoxing Yan

Keyword(s):

Orthogonal Experiment ◽

Paint Film ◽

Great Influence ◽

Color Difference ◽

Core Material ◽

Wall Material ◽

Formaldehyde Resin ◽

Stirring Rate ◽

Water Based ◽

Four Levels

A self-repairing microcapsule was prepared by emulsion polymerization using melamine formaldehyde resin (MF) as wall material, and a mixture of shellac solution and water-based coating as core material. The orthogonal experiment was carried out through five factors and four levels. The effects of Wcore:Wwall, Wemulsifier:Wcore, stirring rate, Wshellac:Wcoating, Wemulsifier solution:Wcore on the output and coverage rate of microcapsules were studied. The stirring rate has a great influence on the preparation process of the MF-coated shellac water-based microcapsules. When the Wcore:Wwall is 0.8:1, Wemulsifier:Wcore is 3:100, stirring rate is 600 rpm, Wshellac:Wcoating is 1:1, Wemulsifier solution:Wcore is 9:1, the prepared microcapsules have the best shape and size. With the increase in concentration of microcapsules, the color difference and gloss of paint film decreased gradually. The tensile strength, scanning electron microscopy (SEM), infrared spectroscopy and repair effects of the paint film were analyzed. When the concentration of microcapsules was 5.0–10.0%, the comprehensive performance of the paint film was better, providing a technical reference for the self-repairing coatings.

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Effect of MF-Coated Epoxy Resin Microcapsules on Properties of Waterborne Wood Coating on Basswood

Coatings ◽

10.3390/coatings10080785 ◽

2020 ◽

Vol 10 (8) ◽

pp. 785 ◽

Cited By ~ 1

Author(s):

Xiaoxing Yan ◽

Yijuan Chang

Keyword(s):

Epoxy Resin ◽

Mass Fraction ◽

High Performance ◽

Impact Resistance ◽

Color Difference ◽

Core Material ◽

Wall Material ◽

The Core ◽

Mass Fractions ◽

The Stability

In this paper, melamine–formaldehyde (MF) was used as the wall material, and epoxy resin was used as the core material to prepare microcapsules. The optical properties, mechanical properties and ageing resistance of waterborne topcoat were investigated by adding different mass fractions of microcapsules into the waterborne topcoat. Through scanning electron microscopy and infrared spectroscopy analysis, the prepared microcapsules of core-wall ratio of 0.50 were more uniform. It was found that when the mass fraction of microcapsules is less than 10.0% and the core–wall ratio is 0.50, the original color difference of the coating can be maintained. With the increase in microcapsule mass fraction, the gloss of the topcoat film gradually decreases. The mass fraction of the microcapsule of 4.0% with the core–wall ratio of 0.50 can maintain the original gloss of 30.0 GU. The topcoat film with the MF-coated epoxy resin microcapsules of the core–wall ratio of 0.50 has high impact resistance, adhesion and hardness. The results showed that the gloss loss and color difference of the coating with the MF-coated epoxy microcapsules were the lowest when the mass fraction of microcapsules was 4.0%, indicating that microcapsules can improve the stability of coating. These results lay a technical foundation for the development and application of high-performance wood coatings.

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Effects of Three Different Types of Aloin on Optical, Mechanical, and Antibacterial Properties of Waterborne Coating on Tilia europaea Surface

Coatings ◽

10.3390/coatings11121537 ◽

2021 ◽

Vol 11 (12) ◽

pp. 1537

Author(s):

Xiaoxing Yan ◽

Nan Huang

Keyword(s):

Impact Resistance ◽

Antibacterial Properties ◽

Color Difference ◽

Core Material ◽

Wall Material ◽

Formaldehyde Resin ◽

Waterborne Coating ◽

Comprehensive Properties ◽

Grade 3 ◽

The Impact

The microcapsules were prepared by using melamine-formaldehyde resin as the wall material and aloin as the core material. The aloin was dissolved in ethanol and water to prepare microcapsules. The aloin powder, the aloin microcapsules prepared with ethanol as the solvent, and the aloin microcapsules prepared with water as the solvent were, respectively, added to the waterborne coating with different contents and coated on the surface of Tilia europaea. The effects of different modifiers and contents on the coating’s optical properties, mechanical properties, and antibacterial properties were explored. The results showed that the aloin microcapsules prepared with ethanol as the solvent had good morphology and comprehensive properties. When the content was 7.0%, the color difference of the waterborne coating was small, the adhesion was grade 3, the impact resistance was 12 kg·cm, and the antibacterial rate was 87.8%. In terms of antibacterial properties, the uncoated aloin powder, the coated aloin microcapsules prepared with ethanol as the solvent, and the aloin microcapsules prepared with water all have certain antibacterial properties and the antibacterial rates reached 99.2%, 97.3%, and 67.3%, respectively. This study provides a certain reference for developing antibacterial wood furniture coatings.

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Preparation and Optimization of Waterborne Acrylic Core Microcapsules for Waterborne Wood Coatings and Comparison with Epoxy Resin Core

Polymers ◽

10.3390/polym12102366 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2366 ◽

Cited By ~ 1

Author(s):

Xiaoxing Yan ◽

Yu Tao ◽

Xingyu Qian

Keyword(s):

In Situ Polymerization ◽

Urea Formaldehyde ◽

Paint Film ◽

Bath Temperature ◽

Water Bath ◽

Core Material ◽

Wall Material ◽

Formaldehyde Resin ◽

The Core ◽

Resin Core

Microcapsules were prepared by in situ polymerization with urea formaldehyde resin as the wall material and Dulux waterborne acrylic acid as the core material. The effects of the core–wall ratio, water bath temperature and depositing time on the morphology, particle size, yield and encapsulation ratio of microcapsules were investigated by orthogonal experiment of three factors and two levels. The results showed that the core–wall ratio had the greatest influence on the performance of microcapsules. When the core–wall ratio was 0.58:1, the water bath temperature was 70 °C, and the depositing time was 5 d, the microcapsule performance was the best. With the increase in depositing time, the yield of microcapsule particles increased gradually, and the microcapsules appeared to show an adhesive phenomenon. However, the long-term depositing time did not lead to complete deposition and agglomeration of microcapsules. When 10.0% concentration of the waterborne acrylic microcapsules with 0.58:1 of core–wall ratio was added to the coatings, the mechanical and optical properties of the coatings did not decrease significantly, but the elongation at break increased significantly. Therefore, this study offers a new prospect for using waterborne acrylic microcapsules to improve the toughness of waterborne paint film which can be cured at room temperature on a wood surface.

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Preparation and Tribological Performace of Microcapsules of Butyl Stearate and Melamine-Formaldehyde Resin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.105 ◽

2013 ◽

Vol 712-715 ◽

pp. 105-110 ◽

Cited By ~ 1

Author(s):

Yi Shen Huang ◽

Ji Ju Guan ◽

Guo Wei Ma ◽

Zhong Ya Li ◽

Xue Feng Xu

Keyword(s):

Base Fluid ◽

In Situ Polymerization ◽

Physical Adsorption ◽

Core Material ◽

Wall Material ◽

Formaldehyde Resin ◽

Melamine Formaldehyde ◽

Adsorption Film ◽

Melamine Formaldehyde Resin ◽

Butyl Stearate

With butyl stearate (BS) as the core material and melamine-formaldehyde resin (MF) as the wall material, BS-MF resin microcapsules were synthesized under in situ polymerization method. The microcapsules were characterized using FTIR, SEM and other methods. The four-ball friction method was performed to test the tribological property of the microcapsules when polyethylene glycol was taken as the base fluid. The results showed that base fluid with 3% microcapsules had a friction coefficient as small as 0.053 and the wear scar diameter could be 0.326mm (4%) under 314N. The microcapsules were ruptured under the action of friction and then the reactive group formed physical adsorption film. The physical adsorption film, together with the subsequently formed friction polyester film, presented a synergistic lubricating effect.

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Printing Qualities on Inkjet-Printed Paper from Varnish Coating Agent with Rice Husk Silica Particles

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.626.691 ◽

2012 ◽

Vol 626 ◽

pp. 691-695 ◽

Cited By ~ 1

Author(s):

Nitus Tipsotnaiyana ◽

Lerpong Jarupan ◽

Chiravoot Pechyen

Keyword(s):

Rice Husk ◽

Reaction Times ◽

Acrylic Resin ◽

Color Difference ◽

Amorphous Structure ◽

Color Measurement ◽

Uniform Size ◽

Coating Agent ◽

Water Based ◽

Color Density

To enhance printing qualities, this study used refluxed silica (SiO2) from rice husk by hydrochloric acid (HCl) at different molarities and reaction times as coating agent for printed paper. Characterization of the refluxed silica from 2M HCl 120 min elucidated the purity of 98.7% and amorphous structure. Particle size of the silica exhibited uniform size of 3 μm and the color measurement (CIE L*a*b*) indicated 94.79+0.48+1.24, whiteness and color difference (E) were 84.85, 3.28, respectively. The coating agent was prepared by water-based varnish of acrylic resin mixed with the synthesized silica at different proportions: 0.0, 0.5, 1.0, and 1.5 (%wt), and later was applied on 170 g/m2-white kraft papers. The results showed that the water-based coating varnish with silica exhibited an increase of viscosity as increasing the amount of the silica. Printing qualities indicated that the vanished printed paper with 1.0% silica elucidated the highest details in shadow tone and text (font) sharpness. The color gamut yielded a wider scope than the printed papers which were varnished with the silica at 0.0%, 0.5% and 1.5%. Nonetheless, the color density showed insignificant difference to 1.5% silica varnished paper.

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Effect of Microcapsules with Waterborne Coating as Core Material on Properties of Coating for Tilia Europaea and Comparison with Other Microcapsules

Polymers ◽

10.3390/polym13183167 ◽

2021 ◽

Vol 13 (18) ◽

pp. 3167

Author(s):

Xiaoxing Yan ◽

Yu Tao ◽

Xingyu Qian

Keyword(s):

Performance Enhancement ◽

Urea Formaldehyde ◽

Impact Resistance ◽

Core Material ◽

Wall Material ◽

Waterborne Coating ◽

Self Healing ◽

Mass Ratio ◽

Waterborne Coatings ◽

New Research

Urea formaldehyde was used as wall material and waterborne coatings as a core material to prepare microcapsules. So as to explore the influence of mass ratio of core to shell, reaction temperature and standing time on the performance of microcapsules, the orthogonal test of three factors and two levels was put into effect. The orthogonal experimental results showed the mass ratio of core to shell was the most important factor. With the increase of the mass ratio of core to shell, the output and clad ratio of microcapsules increased first and then decreased. The microcapsule with the mass ratio of core to shell of 0.67:1 had better appearance, output, and encapsulation performance. The optical properties of waterborne wood coating with the microcapsules of waterborne coating as core materials did not decrease significantly, while the hardness, impact resistance, and toughness were improved. At the same time, the microcapsules have a certain self-repairing effect on coating micro-cracks. Compared with the properties of waterborne coatings with other microcapsules, the coating with waterborne coating as core material has better comprehensive performance. The results provide a new research idea for the performance enhancement and self-healing of wood waterborne coating.

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Effect of Urea-Formaldehyde-Coated Epoxy Microcapsule Modification on Gloss, Toughness and Chromatic Distortion of Acrylic Copolymers Waterborne Coating

Coatings ◽

10.3390/coatings9040239 ◽

2019 ◽

Vol 9 (4) ◽

pp. 239 ◽

Cited By ~ 10

Author(s):

Xiaoxing Yan ◽

Lin Wang ◽

Xingyu Qian

Keyword(s):

Urea Formaldehyde ◽

Color Difference ◽

Core Material ◽

Wall Material ◽

Formaldehyde Resin ◽

Coating Process ◽

Waterborne Coating ◽

Waterborne Coatings ◽

Resin Core ◽

Acrylic Copolymers

The modification experiment of waterborne coating was carried out by adding microcapsules. The wall material of the microcapsule was urea-formaldehyde resin and the core material of the microcapsule was epoxy resin. Core material can improve the toughness of the coating and prevent the cracking of the coating. The influences of different contents of microcapsules and the order of adding microcapsules in the coating process on the properties of gloss, color difference and toughness were studied. The results showed that the gloss of the waterborne coating decreased with the increase of microcapsule content. The color difference of coating increased first and then decreased, and when the microcapsule content was 8.0%, the color difference was the largest. The toughness of the coatings also increased first and then decreased. When the content of the microcapsule was 10.0%, the toughness of the coating was significantly enhanced. When the microcapsules with a content of 10.0% were added to the waterborne coating, under the same process, the coating gloss of microcapsules added to the primer was relatively high, and the coating gloss was the highest when the coating process was three-layer primer and two-layer topcoat. The microcapsule had little effect on the color difference of coating in different coating processes. When the coating process was three-layer primer and three-layer topcoat, the coating toughness was the best when microcapsules were added to the topcoats. This study provides a basis for industrial application of waterborne coatings to enhance their toughness.

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Synthesis of Urea-Formaldehyde Microcapsule Containing Fluororesin and Its Effect on Performances of Waterborne Coatings on Wood Surface

Polymers ◽

10.3390/polym13111674 ◽

2021 ◽

Vol 13 (11) ◽

pp. 1674

Author(s):

Xiaoxing Yan ◽

Yan Han ◽

Taiyu Yin

Keyword(s):

In Situ Polymerization ◽

Urea Formaldehyde ◽

Impact Resistance ◽

Great Influence ◽

Shell Material ◽

Waterborne Coatings ◽

The Core ◽

The Impact ◽

Addition Amount ◽

Core Materials

In order to self-repair the cracks of waterborne coatings on Basswood at room temperature, with fluororesin and waterborne coatings embedded in the shell structure of urea formaldehyde (UF) resin, the microcapsules were fabricated via in-situ polymerization, and the effect of microcapsules on the chroma, gloss, mechanics and repair effect for waterborne coatings on wood was discussed. The results indicated that the coating effect was the most significant when the ratio value of the core materials to the shell material of microcapsules in mass was 0.75, and the agglomeration of particles was the least and the surface was the smoothest when the content of microcapsules was 1.0%. It was negative between the gloss of the film and microcapsule content. The ratio value of the core materials to the shell material in mass and the amount of microcapsules had great influence on the film hardness and adhesion, but had little effect on the impact resistance. When the ratio value of the core materials to the shell material of microcapsules in mass was 0.65 and the addition amount was 4.0–10.0%, the aging resistance of the film was improved most significantly. When the ratio value of the core materials to the shell material of microcapsules in mass was 0.65 and the addition amount was 7.0%, the overall properties of topcoat film on Basswood board was the most significant. It is for the application of fluororesin microcapsules possessing self-repairing effect in waterborne coating on Basswood board that a technical groundwork is provided by this study.

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