The effect of a hindered amine light stabilizer on the aging behavior of moisture-curable polyurethane as a cultural relics consolidant

Zhao, Xing; Wang, Liqin; Guo, Lang; Ma, Yanni; Wang, Ziming; Niu, Qing

doi:10.14314/polimery.2020.4.6

Cited by 4 publications

(6 citation statements)

References 25 publications

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“…The side chain groups of POSS may also reduce t lecular mobility of the PU polymer [21,28], as well as reducing the rate of release tiles [21], both of which contribute to a lower rate of thermal decomposition of th mer. Based on the kinetics calculations of thermal decomposition [18], the decomposition activation energy was increased from 125.25 to 165.71 kJ•mol −1 with the addition of POSS. The energy barriers that need to be crossed for thermal decomposition are higher.…”

Section: Film Performance Resultsmentioning

confidence: 99%

“…It is effective for the reinforcement of fragile organic objects but is susceptible to yellowing under UV light and heat conditions. In a previous study, we enhanced the yellowing resistance of the films under UV ageing by introducing hindered amine light stabilizers [18]. However, the issues of thermal stability and yellowing susceptibility to thermal ageing have not yet been addressed.…”

Section: Introductionmentioning

confidence: 99%

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The Study of POSS/Polyurethane as a Consolidant for Fragile Cultural Objects

et al. 2022

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Moisture-curable polyurethane (MCPU) is a specifically designed material for the consolidation of fragile cultural objects in high-humidity environments. In order to solve the problem of its susceptibility to yellowing due to heat ageing, polyhedral oligomeric silsesquioxane (POSS) was added to the MCPU to prepare POSS/MCPU. The appearance, stability and mechanical properties of the POSS/MCPU films were characterized using a UV–Vis spectrophotometer, a gloss meter, a colorimeter, a thermal analyzer and a universal material testing machine. The results showed that the films are colorless and transparent and have a light transmission of over 80%. The addition of POSS has almost no effect on the chromaticity of the MCPU, while the thermal stability of the POSS/MCPU is improved compared to the pristine MCPU. The modified film is 2.50 times more resistant to yellowing by heat. The addition of POSS also simultaneously enhances the strength and toughness of the film. Using POSS/MCPU to reinforce the fragile object, the material was found to be significantly effective, indicating it has the potential to be used during the extraction of fragile cultural objects from archaeological sites.

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Section: Film Performance Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Study of POSS/Polyurethane as a Consolidant for Fragile Cultural Objects

et al. 2022

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“…We can conclude that the addition of HALS 770 can protect the microcapsules from the damage of the UV light so it can extend the service life of the microcapsules. The mechanism for the stabilization of microcapsules may be explained as follows [42]: free alkoxyl radicals and free alkyl radicals are formed when the microcapsules are exposed to UV light. HALS 770 possesses alicyclic amines that can be transformed into regenerating free nitroxyl radicals.…”

Section: Photochromic Performancementioning

confidence: 99%

Microencapsulation of Photochromic Solution with Polyurea by Interfacial Polymerization

Zhang

Yan

et al. 2021

Polymers

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Photochromic materials are interesting materials because of their color-changing property under UV light and visible light irradiation. However, they are vulnerable to many factors, such as pH oxygen, ion, solvent, etc. because of the unsaturated bonds existing on the photochromic molecular. Microencapsulation of the photochromic materials can separate them from the surroundings. Here, photochromic microcapsules using 3,3-Diphenyl-3H-naphtho[2,1-b] pyran (NP)/solution as core and polyurea as shell via interfacial polymerization were prepared, and bis(2,2,6,6-tetramethyl-4-piperidinyl)sebacate (HALS 770) was used as photostabilizer. Fourier transform infrared spectroscopy (FTIR), a laser particle size analyzer, a scanning electron microscope (SEM), a thermogravimetric analyzer and an ultraviolet-visible spectrophotometer were used for characterization. The results showed that the microcapsules had a uniform particle size of about 0.56 μm when the percentage of the oil phase (core) in the emulsion was less than 15%, the addition amount of the emulsifier was 0.4%, and the stirring rate was 1800r/min. The microcapsules showed better performance in thermal stability when the core/shell ratio was 1:1. The photostabilizer had little impact on the color-changing property of the microcapsule, but it could protect the microcapsules from UV light radiation aging.

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“…10−12 However, prolonged UV irradiation could cause yellowing, cracking, bubbling, and peeling of PU, shortening the service life of PU. 13 Therefore, research on improving the UV resistance of PU is of great significance.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with traditional UV protection materials, polyurethane (PU) has the advantages of high elasticity and good biocompatibility . Due to the diversity of formulations and outstanding performance, PU has been widely used in various fields of industry and life, such as biomedicine, auto parts, sports equipment, films, pipes, etc. − However, prolonged UV irradiation could cause yellowing, cracking, bubbling, and peeling of PU, shortening the service life of PU . Therefore, research on improving the UV resistance of PU is of great significance.…”

Section: Introductionmentioning

confidence: 99%

Colorless, Transparent, and High-Performance Polyurethane with Intrinsic Ultraviolet Resistance and Its Anti-UV Mechanism

Huang

Yao

Huang

et al. 2023

ACS Appl. Mater. Interfaces

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Polyurethane (PU) is a widely used polymer material that will age under prolonged exposure to ultraviolet (UV) light, shortening the service life. Several methods have been used to prepare the anti-UV PU, including adding nonreactive anti-UV additives, functional fillers, and biological antioxidant molecules. However, the nonreactive anti-UV additives may migrate during long-term use, the functional fillers may damage the mechanical properties and seriously reduce the light transmittance of the sample, and the biological antioxidant molecules will inevitably color the sample. To solve these problems, in this work, a benzotriazole UV absorber (Chiguard R-455) was introduced into the PU molecular chains by in situ polymerization to prepare the nonmigrating intrinsic anti-UV PU sample with high performance and colorless transparency. The anti-UV PU samples exhibit light transmittance of over 88% in the visible range and superior mechanical properties with tensile strength higher than 65 MPa and elongation at break higher than 900%. After 24 h UV irradiation (200 W, 365 nm), the tensile strength and elongation at break of pure PU sample are significantly reduced to only 8.9 and 15.8% of the original one, respectively. On the contrary, the addition of Chiguard R-455 will endow the PU sample with excellent anti-UV performance. After 24 h UV irradiation, the tensile strength (67.2 ± 1.6 MPa) and elongation at break (917.4 ± 30.0%) of PU-0.5% (the content of Chiguard R-455 is only 0.5 wt %) have changed little compared with the sample without irradiation (67.4 ± 3.5 MPa and 919.4 ± 26.5%). Additionally, the anti-UV mechanism of the PU sample is systematically studied. This work provides a feasible method for preparing colorless, transparent, high-performance, nonmigrating intrinsic UV-shielding PU samples, which can be used as a UV light-shielding material in various fields with visible and aesthetic requirements, such as protection fields and wearable products.

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The effect of a hindered amine light stabilizer on the aging behavior of moisture-curable polyurethane as a cultural relics consolidant

Cited by 4 publications

References 25 publications

The Study of POSS/Polyurethane as a Consolidant for Fragile Cultural Objects

The Study of POSS/Polyurethane as a Consolidant for Fragile Cultural Objects

Microencapsulation of Photochromic Solution with Polyurea by Interfacial Polymerization

Colorless, Transparent, and High-Performance Polyurethane with Intrinsic Ultraviolet Resistance and Its Anti-UV Mechanism

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