Temat: varnish - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Rock varnish coat on cobbles in Hornsund area, Spitsbergen
Autorzy:: Jahn, Alfred
Manecki, Andrzej
Tematy:: Arctic
Spitsbergen
chemical varnish; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/2052812.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modal Parameters of Two Violins with Different Varnish Layers and Subjective Evaluation of Their Sound Quality
Autorzy:: Skrodzka, E. B.
Linde, B.B.J.
Krupa, A.
Tematy:: violin
modal analysis
varnish
subjective sound quality evaluation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/176852.pdf Link otwiera się w nowym oknie
Opis:: Two violins were investigated. The only intentionally introduced difference between them was the type of varnish. One of the instruments was covered with a spirit varnish, the other was oil varnished. Experimental modal analysis was done for unvarnished/varnished violins and a questionnaire inquiry on the instrument’s sound quality was performed. The aim of both examinations was to find differences and similarities between the two instruments in the objective (modal parameters) and subjective domain (subjective evaluation of sound quality). In the modal analysis, three strongly radiating signature modes were taken into account. Varnishing did not change the sequence of mode shapes. Modal frequencies A0 and B(1+) were not changed by oil varnishing compared to the unvarnished condition. For the oil varnished instrument, the frequency of mode B(1+) was lower than that of the same mode of the spirit varnished instrument. Our two violins were not excellent instruments, but before varnishing they were practically identical. However, after varnishing it appeared that the oil-varnished violin was better than the spirit-varnished instrument. Therefore, it can be assumed with a fairly high probability that also in general, the oil-varnished violins sound somewhat better than initially identical spirit-varnished ones.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The Impact of an Ultrasound-Assisted Mixing Method for Varnish Systems on The Varnish Layer’s Surface Hardness and Surface Scratch Resistance
Autorzy:: Goktas, Osman
Akdemir, Emirhan
Yeniocak, Mehmet
Colak, Mehmet
Tematy:: varnish
ultrasound
surface hardness
surface scratch resistance; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Powiązania:: https://bibliotekanauki.pl/articles/59115452.pdf Link otwiera się w nowym oknie
Opis:: The objective of this study was to determine the effects of mechanical and ultrasound-assisted stirring methods for varnish systems on the varnish layer’s surface hardness and surface scratch resistance. The study focused on polyurethane, acrylic, and polyester varnish systems, which were applied to three distinct wood types: Scots pine (Pinus sylvestris L.), Turkish beech (Fagus orientalis Lipsky), and African mahogany (Khaya ivorensis A. Chev.). The mixing processes included mechanical stirring for 3 and 5 minutes, as well as ultrasound-assisted stirring with differing power levels (80 W and 120 W) for 3 and 5 minutes. The highest surface hardness (175.10) was achieved using polyester varnish obtained by mechanical stirring for 3 minutes and applied to Turkish beech, while the lowest surface hardness (66.80) was observed for acrylic varnish obtained by 120 W ultrasound-assisted stirring for 5 minutes and applied to African mahogany. The highest surface scratch resistance (0.760 N) was observed with polyester varnish obtained by mechanical stirring for 5 minutes and applied to Scots pine, and also with acrylic varnish obtained by 80 W ultrasound-assisted stirring for 3 minutes and applied to Turkish beech. Overall, the findings suggested that the ultrasound-assisted mixing method generally fell short in terms of enhancing the varnish properties compared with the mechanical mixing technique.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effect of accelerated ageing on some surface properties of UV-coated hackberry (Celtis australis L.) wood parquet
Autorzy:: Ayata, Ümit
Esteves, Bruno
Gürleyen, Levent
Çakicier, Nevzat
Ferreira, Jose
Domingos, Idalina
Türk, Mutlu
Tematy:: hackberry
UV varnish
ageing
pendulum hardness
colour
glossiness
adhesion; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Powiązania:: https://bibliotekanauki.pl/articles/2067426.pdf Link otwiera się w nowym oknie
Opis:: The importance of UV-curable coatings is currently increasing. In the parquet industry, where UV systems are applied, it is beneficial to investigate new tree species as potential raw materials. This study was carried out to determine the effect of accelerated ageing on some surface properties of hackberry (Celtis australis L.) wood treated with UV system parquet varnish. UV system parquet varnishes were applied to hackberry wood surfaces in three and five layers, according to the requirements of industrial applications. The varnished surfaces were then exposed to UV rays for 252 and 504 h using UVA-340 lamps in a QUV ageing device. Glossiness, colour parameters, pendulum hardness and adhesion strength (pull-off) (MPa) were determined for the coated samples before and after ageing, and the results for the aged and unaged test samples were compared. Analysis of variance showed that the results were significant for all tests. The results for all tests varied by ageing time.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Materiały konserwatorskie stosowane w dawnej Pracowni Konserwacji Malarstwa i Rzeźby w Krakowskich Sukiennicach
Autorzy:: Doleżyńska-Sewerniak, Ewa
Zygier, Elżbieta
Tematy:: varnish
tempera
copal en pâte
Józef Karmański
werniks; Pokaż więcej
Wydawca:: Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Powiązania:: https://bibliotekanauki.pl/articles/942514.pdf Link otwiera się w nowym oknie
Opis:: The article discusses the history of the former Painting and Sculpture Conservation Workshop at the Kraków Town Hall and results of research concerning historical materials from the beginning of its operation. The substances in labelled factory packaging were examined using gas chromatography–mass spectrometry (GC-MS), Raman spectroscopy (RS) and Fourier transform infrared spectroscopy (FTIR). The results of conservation studies were then compared with available sources concerning manufacturers of the materials, as well as their product range and literature concerning technology used. An average time of the material production, their content and purpose were estimated on the basis of the analysis. It enabled the verification of substances identified in artefacts, which is of utmost importance for the conservation process. Surviving documents and reagents allow for the assessment of the "wealth" of media once used by the workshop and enrich the knowledge about art conservation in Poland.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Investigation of Use of Linden (Tilia tomentosa Moench.) Wood with UV System Varnish Application IN INDOOR Parquet Flooring
Autorzy:: Ayata, Ümit
Esteves, Bruno
Domingos, Idalina
Ferreira, José
Tuncay Efe, Fatih
Türk, Mutlu
Çakicier, Nevzat
Gürleyen, Levent
Peker, Hüseyin
Tematy:: linden
weathering
UV cured varnish
color
pendulum hardness
adhesion
glossiness; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Powiązania:: https://bibliotekanauki.pl/articles/27323543.pdf Link otwiera się w nowym oknie
Opis:: Linden wood is used in the making of musical instruments, agricultural hand tools, and in the furniture sector. In this study, the changes in glossiness (parallel (//) and perpendicular (⊥) to the fibers at 20o, 60o, and 85o), the pull-off adhesion test, color parameters (CIEL) and pendulum hardness (König method) of two different UV curable varnishes applied to linden (Tilia tomentosa Moench.) according to industrial application techniques and exposed to artificial weathering were investigated. According to the research results, while L*, ΔH*, and ho decreased with increasing weathering time in both varnish layers, ΔC*, b*, ΔE*, a*, and C* rose. The pendulum hardness grew for Method B but dwindled for Method A. A decrease was found in the adhesion tests for both varnish methods after artificial weathering. The glossiness was generally reduced due to artificial weathering for all the angles and for both directions, with the exception of 85º in Method A. The variance analysis and homogeneity groups showed that the changes in the adhesion, pendulum hardness, L*, a*, ho, C*, perpendicular and parallel to the fibers for 60o and 85o were found to be significantly different with artificial weathering for both methods.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Does the storage time of food packaging material influence the migration degree of 4-phenylobenzophenone photoinitiator from packaging materials to food?
Autorzy:: Nowakowski, Przemyslaw
Dybowski, Michal Pawel
Typek, Rafal
Tematy:: photoinitiator migration
4-phenylbenzophenone
polygraphic varnish
UV curing
polygraphic substrates; Pokaż więcej
Wydawca:: Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Powiązania:: https://bibliotekanauki.pl/articles/2079952.pdf Link otwiera się w nowym oknie
Opis:: Nowadays, it is not possible to produce food packaging without the use of polygraphic varnishes. Their main task is to protect packaging from the effects of external factors, as well as to give the effect of clarity with greater exposure of the colors used. However, such varnishes contain in their composition low-molecular-weight photoinitiators that can easily migrate to a protected product. The aim of this work was to determine the migration of 4-PBZ from various types of substrates used in the printing industry, i.e. paper, aluminum foil and polyethylene foil. In addition, extensive studies on the impact of the storage conditions of a fresh reprint on the change in the migration of the photoinitiator to food were carried out.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Badanie grubości powłok lakierniczych Leptoskopem KD-2050
The examination of the thickness of varnish layers using Leptoskop KD-2050
Autorzy:: Stefański, Ł.
Jósko, M.
Tematy:: badanie
grubość
powłoka lakiernicza
Leptoskop KD-2050
examination
thickness
varnish layers; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Powiązania:: https://bibliotekanauki.pl/articles/336136.pdf Link otwiera się w nowym oknie
Opis:: Niniejszy artykuł jest związany z problematyką jakości wykonania prac lakierniczych w zakresie oceny grubości nakładanych powłok. Scharakteryzowano własności, jakie posiadają powłoki zarówno lakieru nakładanego fabrycznie, jak i pokrycia renowacyjnego oraz przedstawiono kryteria ich jakości w procesach nakładania. Badania rozkładu grubości powłok lakierniczych przeprowadzono na pojazdach fabrycznie nowych oraz na pojazdach po naprawie renowacyjnej. Uzyskane wyniki poddano analizie statystycznej i merytorycznej, w celu uwidocznienia różnic pomiędzy badanymi powłokami.
This work presents a problem of evaluation of the quality of varnish layers in cars as a result of examination of layer distribution thickness. This report contains some characteristics of layer properties, mainly focused on new brand and after renovation of varnish coatings. The quality criterion in applying coating process is also presented. The examination of distribution thickness of varnish layers was done at new and repaired cars. The statistical methods were used for determination of reliability of achieved results. Effects of this work were submitted to a substantive analysis and presented at charts.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Ocena odporności cieplnej nanokompozytowego lakieru poliestroimidowego
Assesment of thermal endurance of nanofilled polyesterimide varnish
Autorzy:: Górnicka, B.
Górecki, L.
Gryzło, K.
Tematy:: nanokompozyt
lakier poliestroimidowy
ciepłoodporność
termograwimetria
nanocomposite
polyesterimide varnish
thermal endurance
thermogravimetry; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki
Powiązania:: https://bibliotekanauki.pl/articles/159253.pdf Link otwiera się w nowym oknie
Opis:: Przedstawiono wstępne wyniki długotrwałego starzenia cieplnego lakieru poliestroimidowego zawierającego 1,5% nanokrzemionki płomieniowej. Przyjęto kryteria oceny degradacji cieplnej lakieru według UL – poziom siły wiążącej oraz dodatni wynik próby napięciowej. Dodatkowo wykonano badania termograwimetryczne TG w warunkach izotermicznych. Stwierdzono, że w przyjętych temperaturach starzenia trwałość lakieru nanokompozytowego przy kryterium elektrycznym jest wyższa niż lakieru wyjściowego. Dla lakieru z nanokrzemionką siła wiążąca po długotrwałym starzeniu jest również wyraźnie większa, a badania TG wykazują mniejszy ubytek masy. Uzyskane wyniki potwierdzają, że lakier z nanokrzemionką ma wyższą ciepłoodporność niż lakier wyjściowy. Nanocząstki krzemionki mogą stanowić barierę dla transportu masy i ciepła, utrudniając degradację cieplną nanokompozytu.
The initial results of long-term thermal ageing of nanofilled polyesterimide varnish contained 1.5% fumed nanosilica are presented. The criteria of varnish thermal degradation according UL, i.e. the bond strength level and positive result of voltage proof were assumed. In addition, the thermogravimetric TG investigations under isothermal condition have been performed. At the aging temperatures lifetimes of nanofilled varnish is longer than that for the pure varnish when an electrical criterion is applied. The bond strength after a long-lasting ageing is also much greater for nanocomposite. The TG investigations show that mass loss of nanocomposite is less. The obtained results confirmed that thermal endurance of nanofilled varnish is improved with relation to pure varnish. The silica nanoparticles could form a barrier for mass and heat transport and hinder thermal degradation of nanocomposite.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Samonaprawiające się lakiery
Self-healing varnishes
Autorzy:: Bednarczyk, P.
Antosik, A. K.
Czech, Z.
Tematy:: lakier
samonaprawiające się materiały
powłoki
varnish
self-healing material
coatings; Pokaż więcej
Wydawca:: Polskie Towarzystwo Chemiczne
Powiązania:: https://bibliotekanauki.pl/articles/172663.pdf Link otwiera się w nowym oknie
Opis:: The recent decade brought about new dimensions to materials developments; stimuliresponse materials capable of responding to internal or external stimuli. The ability of materials to autonomously self-heal is the most promising property [1]. The number of publications that appeared in the past decade concerning the self-repair of polymeric materials is quite extensive. They cover different fields of research, including thermoplastic and thermoset polymers, polymer composites, and coatings. The first ideas already started to develop in the 1990s, when scientists started to look at nature to solve the recurring problem of damage to materials [2]. The process of implementing a strategy of autorepair of a damage is a subject of increasing interest. One of the challenges for many of the already developed self- -repairing systems is to enhance the structural stability and mechanical properties of the materials. The first developed self-healing materials relied on microencapsulated healing agents within the bulk polymer [3]. Upon mechanical stress, the microcapsules were ruptured releasing agents that reacted with the catalyst in the polymer matrix to repair the damage [4–5]. Among many other crosslinking methods relying mainly on epoxy chemistry, ‘click’-based chemistry, the use of thiolene-based systems, as well as catalytic crosslinking reactions based on ring opening metathesis polymerization have found wide application in materials science. In the latter methodology, the catalyst present inside the matrix then promotes an autorepair reaction via ROMP. Thermosetting autorepair polymers which have been proposed so far include Grubbs’ first-generation catalyst; currently, the possibility of applying other ruthenium catalysts such as second-generation Grubbs’ catalyst and Hoveyda–Grubbs’ second-generation catalyst are under evaluation [3]. In addition to the aforementioned methods, you can also find self-healing coatings in the reaction of Diels-Alder. The self-healing concept envisages a similar recovery of material properties, such as fracture toughness, corrosion resistance, or conductivity, to improve the durability and reliability of the polymer materials. Damage due to impact, wear or fatigue initiates a healing mechanism that preferentially without external stimulus can recover any functionality. Researchers working in the field of self-healing polymeric materials mainly focus on high-end applications where the added value outweighs the cost of production. Such applications can, for example, be found in the transport sector, electronics, and structural materials. Car coatings, structural composites in airplanes, conductive polymers in sensors are only some examples of many targeted applications. Repair of damage in these materials is often laborious, not cost-efficient and only detected on the macroscopic level when it is too late. On the other hand, self -healing materials try to avoid macroscopic failure by responding immediately or at least fast enough to damage [1].
Dostawca treści:: Biblioteka Nauki

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