Evaluation of the effect of dry-film biocides on paint film preservation using neural networks

Contant, Sheila; Junior, Gonçales; Machado, P. F. M. P. B.; Lona, Liliane Maria Ferrareso

doi:10.1590/s0104-66322010000400016

Cited by 8 publications

(4 citation statements)

References 21 publications

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“…Roden (2010) [7] reported the importance of biocides in paints to resist the fungal growth. Similar observation was also made by Content et al (2010) [10]. Paint No 3 and Paint No 4 showed some amount of growth of fungi even though they contained biocides.…”

Section: Resultssupporting

confidence: 87%

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A Preliminary Study on the Resistance of Paints against the Growth of Algae and Fungi

Nazar

Weerasinghe

Perera

2013

AMR

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Paints are widely used to colour and protect various surfaces. Paints contain many substances to improve their quality as well as to protect the surface from environmental hazards. One of the most concerned environmental hazards is the contamination of wall surfaces by algae and fungi. According to manufacturers of paints in Sri Lanka, this issue has been looked after by incorporating many biocides to the paints available in the market. However, the testing of existing paints for their biocidal activity using standards is very important and not yet done in Sri Lanka. Therefore, the objective of the present work was to find out the possibility of implementing a standard test method (ASTM) to detect the biocidal action of paints and to assess the biocidal effect of paints available in the Sri Lankan market. Standard Test Method for Fungi (D5590) and Algae (D5589) were tested with local paints using three fungi and three algae as test organisms. Both test methods and organisms being tested are effective in deciding the biocidal activity of paints. It is very clear from the results that the biocidal chemicals used in commercial paints are effective on most common fungi (mainly spores) and algae present in the air. However, on average, 7.8% fungal growth and 6.7% of Algal growth were observed under laboratory conditions. The Paints which had the lowest biocidal activity allowed 13.8% fungal growth and 20.6% of Algal growth and paints which had the best biocidal activity showed 100% of no growth. Aspergillus had an ability to grow fast by tolerating the biocidal activity of some paints which had different ranges of resistance on other organisms. However, Algae showed slower growth than Fungi on all paints. Growth of Algae or Fungi mainly depends on growing ability of microbes, biocidal activity of paints and favourable environmental conditions.

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Section: Resultssupporting

confidence: 87%

“…The choice of a suitable biocide and its optimum dosage require knowledge of the micro-organisms that may grow. Biocides play an important role in the preservation of materials susceptible to microbiological growth [10].…”

Section: Introductionmentioning

confidence: 99%

A Preliminary Study on the Resistance of Paints against the Growth of Algae and Fungi

Nazar

Weerasinghe

Perera

2013

AMR

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“…This finding is validated by the findings of Shirakawa et al (2011) that posited that buildings that are painted along the Atlantic coast will experience defects earlier than those at the hinterland. Nepal and Rai (2010), Contant et al (2010) and Hua-Tzu and Hong-Hsiang (2010) agree with this finding with the assertion that paints used as exterior finish in the coastal area are under constant attack of salt which will aggravate defects and failure. Discolouration constitutes more problems in Zone A than Zone B, likewise general accelerated failure.…”

Section: Data Analysis Results and Discussionmentioning

confidence: 64%

Variance in paint maintenance frequency in tropical salty environment

Folorunso

Ahmad

2014

Structural Survey

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Purpose -Paint that is used as exterior finish is subject to the stresses of the climate. The factors of climate such as sun and rain are major source of quick deterioration of paint. The existence of saline air and endogenic salt in substrates in any environment will increase the rate of failure and frequency of repainting of building exterior wall. The purpose of this paper is to ascertain the difference in the frequency of repainting of exterior surface of buildings in areas at close proximity to the Atlantic Ocean and the hinterland. Design/methodology/approach -The research adopted a survey method that involved the administration of structured questionnaire on 384 respondents to elicit data for analysis. SPSS 15.0 software was used to analyse the data. The study area is divided into two zones. Findings -Paint of the same quality from the same manufacturer is found to perform differently. All defects that are caused by salt attack occur earlier in Zone B than Zone A. The frequency of repainting (maintenance) in Zone A is two years due to direct contact with the Atlantic Ocean and Zone B is four years because of the distance from the ocean. Practical implications -This study enlightens the stakeholders in the building industry in the preparation of maintenance schedule for buildings in salty environment. It will also assist the architects in decision making during specifications of exterior finishes in such environments. The maintenance challenges of paint that is applied as exterior finish in salty environment is made clear. Originality/value -It is a novel search into understanding the maintenance frequency of paint that is applied as exterior finish of buildings in areas with direct and indirect contact to salt attack.

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“…Enzymes catalyzing the degradation of protein and cellulosic thickeners may be introduced into the paint through contaminated raw materials, storage tanks, and other equipment or be released by bacteria (and less frequently, yeast) growing actively in the liquid paint (El-Sayed et al, 1996).The susceptibility of paint films to attack by microorganisms is determined in part by the chemical nature of the non volatile binder, the choice of pigmentation, and the pigment volume concentration. To a much greater degree, however, the susceptibility or resistance of a paint film to a biological attack is determined by the presence and concentration of antimicrobial agents (Contant et al, 2010).Previous studies have revealed that biocides can enhance the shelf life of paints (Voulvouliset al, 2000;Albanis et al, 2002;Martinez et al, 2001).However, public health and environmental concerns have limited the use of biocides as many bacterial strains develop resistance and require higher than safety level doses to kill microbes. Therefore, in this study, we report a rare study focusing on the preservative potential of crude soot in water based paints in relation to painting physicochemical parameters with a view to developing an environmentally friendly and cost-effective formulation technology.…”

Section: Introductionmentioning

confidence: 99%

Carbonaceous Soot from Thermal Decomposition of Kerosene: A Pioneering Report for Paint Preservation

Obidi

Okoli

Nwachukwu

2017

Annals of Science and Technology

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Bacterial resistance to conventional paint biocides is widely documented. However, an investigation regarding the preservative potential of carbonaceous soot as a viable alternative is novel. Fresh paint samples (SA, SB and SC) were collected in duplicates from a reputable paint manufacturing company in Lagos, Nigeria. SA was produced with conventional paint biocide, SB and SC were without biocide. All samples were inoculated with 0.032 × 106 cfu/mL of Pseudomonas aeruginosa PA01 (NC 002516.2) previously isolated from spoilt paints and identified by the 16S rDNA analysis. SB was supplemented with crude soot (10 g/L of distilled water) at 200 mL v/v. The preservative efficiency of soot was investigated by monitoring the bacterial population (BP), optical density (OD600nm), viscosity (VIS), the transmittance (TR) and specific gravity (SG) of the samples bi-weekly for 14 weeks. BP increased drastically from 0.032-31.61 × 106 and from 0.032-112.93 × 106 in SA and SC respectively. In contrast, SB increased from 0.032-24.63 × 106 by week 4 but reduced from 24.63 – 10.95 × 106 by week 14. The OD of SA increased from 1.55 to 1.98 by week 8 and decreased to 1.74 by week 14. SB had a decrease from 1.60 to 1.49 by week 4 and increased to 1.63 by week 14, while SC increased from 1.59 to 2.54 by the 14th week.TR increased from 1.80 to 2.30 and 1.25 to 2.20 in SA and SC respectively. In contrast, TR decreased from 2.00 to 1.25 in SB. The viscosity and specific gravity values of all the samples decreased with time with the highest decrease observed in SC and the lowest in SB. The test crude soot showed preservative potential in paints.

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Evaluation of the effect of dry-film biocides on paint film preservation using neural networks

Cited by 8 publications

References 21 publications

A Preliminary Study on the Resistance of Paints against the Growth of Algae and Fungi

A Preliminary Study on the Resistance of Paints against the Growth of Algae and Fungi

Variance in paint maintenance frequency in tropical salty environment

Carbonaceous Soot from Thermal Decomposition of Kerosene: A Pioneering Report for Paint Preservation

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