The effects of cellulose nanofibers compounded in water-based undercoat paint on the discoloration and deterioration of painted wood products
Abstract Cellulose nanofibers (CNFs) have many potentials as filler to improve the properties of the other materials. We have developed the novel paints containing CNFs, and which controlled the discoloration of wood products. To clarify the discoloration mechanism of wood panels using an undercoat...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2021-12-01
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| Series: | Journal of Wood Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s10086-021-02007-0 |
| _version_ | 1819103009937817600 |
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| author | Tomoko Shimokawa Yukako Hishikawa Eiji Togawa Hajime Shibuya Masahiko Kobayashi Atsuko Ishikawa Xin He Hironari Ohki Kengo Magara |
| author_facet | Tomoko Shimokawa Yukako Hishikawa Eiji Togawa Hajime Shibuya Masahiko Kobayashi Atsuko Ishikawa Xin He Hironari Ohki Kengo Magara |
| author_sort | Tomoko Shimokawa |
| collection | DOAJ |
| description | Abstract Cellulose nanofibers (CNFs) have many potentials as filler to improve the properties of the other materials. We have developed the novel paints containing CNFs, and which controlled the discoloration of wood products. To clarify the discoloration mechanism of wood panels using an undercoat paint containing CNFs, prepared by an integrated process from Cryptomeria japonica, the composites and films made of CNFs and acryl resin that was a raw material for the paints were prepared. Observation of the surface of the CNFs/acryl resin composite film by atomic force microscopy showed that the fibers and the resin were uniformly mixed. The composite film prevented light transmittance in the ultraviolet (UV) light region, as well as oxygen gas permeation. The permeability coefficient of the oxygen gas decreased to 60% with the addition of 1.5 wt% of CNFs to the acryl resin. The addition of CNFs also increased the breaking stress by approximately 1.5 times compared with the acryl resin film. Electron spin resonance (ESR) analysis after UV irradiation resulted in the lowest radical formation of a piece of wood wrapped in the CNFs/acryl resin composite compared with the acryl-coated specimen and the wood as it was. Therefore, the CNFs composite film shielded the UV rays and oxygen more effectively than the original acryl resin, making it difficult for these factors to reach the wood’s surface, and thus, perhaps suppressing the generation of radicals from the wood. These actions would suppress the production of coloring substances caused by the radicals, resulting in the suppression of discoloration. Furthermore, the increase in the film’s strength by the addition of CNFs would have enhanced the stability of overall the paints with a CNF-containing undercoat. These effects might have contributed not only to the prevention of discoloration but also to the prevention of the occurrence of minute cracks caused by various weather deterioration factors. |
| first_indexed | 2024-12-22T01:43:39Z |
| format | Article |
| id | doaj.art-0c9cd7775f584c2e802633ad40ca6481 |
| institution | Directory Open Access Journal |
| issn | 1435-0211 1611-4663 |
| language | English |
| last_indexed | 2024-12-22T01:43:39Z |
| publishDate | 2021-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of Wood Science |
| spelling | doaj.art-0c9cd7775f584c2e802633ad40ca64812022-12-21T18:43:07ZengSpringerOpenJournal of Wood Science1435-02111611-46632021-12-0167111010.1186/s10086-021-02007-0The effects of cellulose nanofibers compounded in water-based undercoat paint on the discoloration and deterioration of painted wood productsTomoko Shimokawa0Yukako Hishikawa1Eiji Togawa2Hajime Shibuya3Masahiko Kobayashi4Atsuko Ishikawa5Xin He6Hironari Ohki7Kengo Magara8Department of Forest Resource Chemistry, Forestry and Forest Products Research InstituteDepartment of Forest Resource Chemistry, Forestry and Forest Products Research InstituteDepartment of Forest Resource Chemistry, Forestry and Forest Products Research InstituteDepartment of Forest Resource Chemistry, Forestry and Forest Products Research InstituteDepartment of Wood Improvement, Forestry and Forest Products Research InstituteDepartment of Wood Improvement, Forestry and Forest Products Research InstituteGen Gen CorporationGen Gen CorporationDepartment of Forest Resource Chemistry, Forestry and Forest Products Research InstituteAbstract Cellulose nanofibers (CNFs) have many potentials as filler to improve the properties of the other materials. We have developed the novel paints containing CNFs, and which controlled the discoloration of wood products. To clarify the discoloration mechanism of wood panels using an undercoat paint containing CNFs, prepared by an integrated process from Cryptomeria japonica, the composites and films made of CNFs and acryl resin that was a raw material for the paints were prepared. Observation of the surface of the CNFs/acryl resin composite film by atomic force microscopy showed that the fibers and the resin were uniformly mixed. The composite film prevented light transmittance in the ultraviolet (UV) light region, as well as oxygen gas permeation. The permeability coefficient of the oxygen gas decreased to 60% with the addition of 1.5 wt% of CNFs to the acryl resin. The addition of CNFs also increased the breaking stress by approximately 1.5 times compared with the acryl resin film. Electron spin resonance (ESR) analysis after UV irradiation resulted in the lowest radical formation of a piece of wood wrapped in the CNFs/acryl resin composite compared with the acryl-coated specimen and the wood as it was. Therefore, the CNFs composite film shielded the UV rays and oxygen more effectively than the original acryl resin, making it difficult for these factors to reach the wood’s surface, and thus, perhaps suppressing the generation of radicals from the wood. These actions would suppress the production of coloring substances caused by the radicals, resulting in the suppression of discoloration. Furthermore, the increase in the film’s strength by the addition of CNFs would have enhanced the stability of overall the paints with a CNF-containing undercoat. These effects might have contributed not only to the prevention of discoloration but also to the prevention of the occurrence of minute cracks caused by various weather deterioration factors.https://doi.org/10.1186/s10086-021-02007-0Cellulose nanofiberPaintAcryl resinDiscolorationRadical |
| spellingShingle | Tomoko Shimokawa Yukako Hishikawa Eiji Togawa Hajime Shibuya Masahiko Kobayashi Atsuko Ishikawa Xin He Hironari Ohki Kengo Magara The effects of cellulose nanofibers compounded in water-based undercoat paint on the discoloration and deterioration of painted wood products Journal of Wood Science Cellulose nanofiber Paint Acryl resin Discoloration Radical |
| title | The effects of cellulose nanofibers compounded in water-based undercoat paint on the discoloration and deterioration of painted wood products |
| title_full | The effects of cellulose nanofibers compounded in water-based undercoat paint on the discoloration and deterioration of painted wood products |
| title_fullStr | The effects of cellulose nanofibers compounded in water-based undercoat paint on the discoloration and deterioration of painted wood products |
| title_full_unstemmed | The effects of cellulose nanofibers compounded in water-based undercoat paint on the discoloration and deterioration of painted wood products |
| title_short | The effects of cellulose nanofibers compounded in water-based undercoat paint on the discoloration and deterioration of painted wood products |
| title_sort | effects of cellulose nanofibers compounded in water based undercoat paint on the discoloration and deterioration of painted wood products |
| topic | Cellulose nanofiber Paint Acryl resin Discoloration Radical |
| url | https://doi.org/10.1186/s10086-021-02007-0 |
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