Waterborne Intumescent Coatings Containing Industrial and Bio-Fillers for Fire Protection of Timber Materials

Flammability and combustion of softwood treated with intumescent coatings were studied in the present work. The formulations applied onto wood surfaces contained different ratios of industrial fillers, titanium dioxide TiO2 and aluminium trihydroxide Al(OH)3, and/or bio-fillers, eggshell and rice husk ash. Combustion behaviours of unprotected and protected wood samples have been examined with the aid of cone calorimetry performed under the varied levels of thermal flux ranging from 30 to 50 kW/m². The char residues obtained after the completion of cone calorimetry test at 40 kW/m² were analysed by the Raman spectroscopy. The fire protective properties of the studied coatings were strongly influenced by the nature of the fillers as well as by the intensity of thermal irradiance. The incorporation of bio-based fillers into the water-based intumescent formulations significantly improved fire resistance of wood substrates. For example, at 30 kW/m², the Effective Heat of Combustion was reduced by more than 40%, whilst the average Peak to Heat Release Rate had dropped from 193.2 to 150.3 kW/m² for the wood sample protected with the formulation incorporating two industrial and two bio-fillers. Moreover, an application of the studied coatings resulted in a notable reduction of the back surface temperature of the wood specimens.

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Anticorrosion coatings based on novel acrylate binders containing MeO nanoparticles

Koroze a ochrana materialu ◽

10.2478/kom-2019-0020 ◽

2019 ◽

Vol 63 (4) ◽

pp. 153-158

Author(s):

D. Steinerová ◽

A. Kalendová ◽

J. Machotová ◽

M. Kohl

Keyword(s):

Air Pollution ◽

Paint Film ◽

Film Properties ◽

Present Contribution ◽

Protective Properties ◽

Mgo Nanoparticles ◽

Anticorrosion Coatings ◽

Volatile Organic ◽

Water Based ◽

Particle Shapes

Abstract Water based paints are increasingly attracting interest mainly with a view to reducing air pollution with volatile organic compounds (VOC). However, the protective properties of water-based paints are inferior to those of solvent-based paints and so new ways to increase the resistance of water-based systems are sought. The present contribution describes the preparation and testing of environmentally friendly anti-corrosion paints based on novel water-based self-crosslinking acrylate latexes containing appropriate pigments and ZnO or MgO nanoparticles at a concentration of 1.5 % (with respect to the monomers) compared to the same systems free from the nanoparticles. Both the effect of the MeO nanoparticles and the effects of the pigment species and particle shapes on the paint film properties were examined. The MeO nanoparticles were found to improve all the properties tested. The latexes with MgO exhibited the highest resistance to flash corrosion while the latexes with ZnO exhibited the highest anticorrosion resistance. Furthermore, the systems with the calcium-aluminium polyphosphosilicate based pigment were superior to all the remaining systems in this respect. It is concluded that binders with nanoparticles can be used as a basis for anticorrosion coatings provided that a suitable pigment is selected.

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The Effect of Graphene on the Protective Properties of Water-Based Epoxy Coatings on Al2024-T3

International Journal of Corrosion ◽

10.1155/2017/1541267 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9 ◽

Cited By ~ 7

Author(s):

T. Monetta ◽

A. Acquesta ◽

A. Carangelo ◽

F. Bellucci

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Electrochemical Impedance ◽

Free Water ◽

Adsorbed Water ◽

Polymerization Process ◽

Protective Properties ◽

Matrix Interaction ◽

Graphene Nanoflakes ◽

Water Based ◽

Pathway Length

0.5 and 1% wt. of graphene nanoflakes were added to an anticorrosive additives-free water-based epoxy resin applied to Al2024-T3 samples. Calorimetric (DSC) and adhesion (cross-cut test) tests indicated that the presence of graphene did not affect the polymerization process of the resin or its adhesion to the substrate while it had some effect on its wettability. Electrochemical Impedance Spectroscopy (EIS) results obtained suggested that the addition of a small amount of graphene greatly enhanced the protective properties of the epoxy coating, retarding electrolytes absorption and reducing the total amount of adsorbed water. The latter occurrence suggests that the graphene effect on coating performances is related to both extended diffusion pathway length and graphene/matrix interaction due to the unique properties of graphene.

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The Surface Hardness of Mild Steel and Plywood Coated With Different Blending Ratio of Rice Husk Ash-Based Geopolymer

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.c4641.098319 ◽

2019 ◽

Vol 8 (3) ◽

pp. 1849-1853

Keyword(s):

Mild Steel ◽

Rice Husk ◽

Rice Husk Ash ◽

Surface Hardness ◽

Hardness Test ◽

Silica Content ◽

Rockwell Hardness ◽

Water Based ◽

Physical Effects ◽

Epoxy Paint

Malaysia has a great potential to reuse the agro-waste and reduce the environmental issues generated from the painting industry and agro-waste and achieve the objective of sustainable development. The objective of this work is to analyse physical effects of different blending ratio of rice husk ash based geopolymer binder (GB) surface coating on the hardness of mild steel and plywood. Geopolymer is an inorganic material produced by activated alkaline solution and aluminosilicate sources. Since Malaysia has been producing abundant of rice husk, this rice husk as the aluminosilicate source is used to form geopolymer. As it is known that filler is one of the combinations in paint including epoxy paint, the rice husk ash which has an abundant of silica content can be a ground-breaking source. Thus, an efficient eco-friendly coating that have a good fire resistance properties are very demanding. An optimum coating was formed by optimizing different ratio of GB with water-based or oil- based paint in term of hardness of surface coated. Based on the Rockwell hardness test, the result showed that 2:1 ratio of water-based coated mild steel plate has the highest Rockwell hardness number of 53.08, which meant the lowest depth of impression of 0.1538mm due to 150kgf major and minor load. This implies that different blending ratios addition of GB on plate surface have an effect on the hardness of mild steel and plywood

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A new eco-friendly and low cost additive in water based drilling fluids

Rudarsko-geološko-naftni zbornik ◽

10.17794/rgn.2021.5.1 ◽

2021 ◽

Vol 36 (5) ◽

pp. 1-12

Author(s):

Emine Yalman ◽

Tolga Depci ◽

Gabriella Federer-Kovacs ◽

Hani Al Khalaf

Keyword(s):

Rice Husk ◽

Rice Husk Ash ◽

Drilling Fluid ◽

Low Cost ◽

Flow Behaviour ◽

Drilling Fluids ◽

Flow Behaviour Index ◽

Water Based ◽

The Impact ◽

Behaviour Index

This study investigates the possibility of using rice husk ash as an additive to develop an environmentally friendly and low-cost drilling fluid system. The rice husk ash was added as an additive to water-based bentonite drilling fluids at different concentrations ranging from 2 wt% to 15 wt%. Rheological and filtration properties of each drilling fluid developed were measured by using a viscometer and standard low-pressure low-temperature filter press. Subsequently, cutting carrying index, minimum annulus velocity required to clean bottom of the well efficiently, flow behaviour index and permeability of mud cakes of the formulated systems were calculated in order to assess performance of the systems. The results demonstrated that the rheological and properties were improved depending on concentration of rice husk ash introduced. With the introduction of 15 wt% concentration of rice husk ash, while apparent viscosity and yield point increased by 60% and 183%, respectively, thixotropy and plastic viscosity decreased by 29% and 63%, respectively. On the other hand, drilling fluid with 4% wt% content of rice husk ash reduced the fluid loss by 10%. Moreover, results showed that cutting carrying index, minimum annulus velocity required to clean bottom of the well efficiently and flow behaviour index of the enhanced with the exploitation of rice husk ash in the drilling fluid. This study showed that rice husk ash as a promising additive to use in the water-based bentonite drilling fluids when properly implemented, and hence reducing the impact on the environment, and the total cost for drilling.

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A chain is no stronger than its weakest link: Weathering resistance of water-based intumescent coatings for steel applications

Journal of Fire Sciences ◽

10.1177/0734904120961064 ◽

2020 ◽

pp. 073490412096106

Author(s):

Lars-Hendrik Daus ◽

Bernhard Schartel ◽

Volker Wachtendorf ◽

Rolf Mangelsdorf ◽

Manfred Korzen

Keyword(s):

Polyvinyl Acetate ◽

Water Soluble ◽

Weakest Link ◽

Intumescent Coatings ◽

Water Based ◽

Water Soluble Substance ◽

A Chain ◽

New Generation ◽

Steel Substrates ◽

Weathering Resistance

A systematic approach was used to investigate the weathering-induced degradation of a common water–based intumescent coating. In this study, the coatings are intended for humid indoor applications on steel substrates. The coating contains ammonium polyphosphate, pentaerythritol, melamine, and polyvinyl acetate. By replacing each ingredient with a less water-soluble substance, the most vulnerable substances, polyvinyl acetate and pentaerythritol, were identified. Furthermore, the weathering resistance of the system was improved by exchanging the ingredients. The coatings were stressed by artificial weathering tests and evaluated by fire tests. Thermogravimetry and Fourier-transform infrared spectroscopy were used to study the thermal decomposition. This study lays the foundation for the development of a new generation of water-based intumescent coatings.

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