Papers by Keyword: Primer

Abstract: Addition of Microcrystalline Cellulose (MCC) as filler in to Unsaturated Polyester (UPR) polymer can enhanced the properties of the composite. UPR and MCC was prepared using sonication mixing technique at various loading of (2, 4, 6, 8, and 10 wt %) of MCC at a constant of 60 minutes of sonication. UPR and MCC was mixed in a vial bottle and then immersed in sonication bath for the sonication process. Once the sonication completed, the mixture was added with Methyl Ethylene Ketone Peroxide (MEKP) as curing agent, coated on steel plate and was left for curing process of 7 days. The coating was studied for adhesion, mechanical and corrosive properties using pencil hardness, adhesion tape and immersion tests. 4 wt% of loading showed improvement in mechanical properties where form H grade to 4H grade. It is also recorded there are improvement of adhesion test from 1B grade 35-65% pulled out to 4B grade which is less than 5 % pulled. From the immersion test, it shown that 4 wt % of loading has a good corrosion resistant as compared to the control sample. Thus, it was concluded that 4 wt % of loading filler is suitable to be used because it promotes a better mechanical and adhesion properties and also good corrosion resistant compared to other loading percentage.

Abstract: This article deals with the sealing of problematic cement-based building material and its adhesion and cohesion after exposure to water. Aqupanel cement board is chosen as a problematic material for the needs of this research. Furthermore, sealants are selected according to several criteria. These criteria include the manufacturer's recommendations on the suitability for use of cementitious substrates, affordability, and commercial availability for the average consumer. The selected sealants, the so-called primers, are then used for selected sealants. Test specimens are made of selected materials, which consist of two cement base plates, a primer, and an applied sealant. These test specimens with correctly matured sealant are further conditioned and tested according to the European standards ČSN EN ISO 8339 and ČSN EN ISO 10591. The results of these two tests are carefully recorded in the result tables and then evaluated and compared. These results show that for a tensile test without the use of water, it is necessary to apply a greater tensile force for the failure of the test specimen than for a tensile test after exposure to water. Furthermore, based on these results, we can say that polyurethane sealant is more resistant to tensile stress than acrylic sealant, for which the value of maximum elongation at failure of the test specimen is even several times higher.

Abstract: In this article we study the received quality of a welded large-diameter pipe after the processing by a single-row cylindrical brush. The speed of the brush influences the roughness of the pipe surface.

Abstract: A pigment-filler for paints is developed based on iron ore enrichment wastes i.e. tailings ferruginous quartziteenrichment (TFQ) and for dust sleeve filters while ceramsite production. The samples of powder materials having a particle size less than 50 microns were used for the experiments. The samples were prepared according to a formulation of paints and varnishes "Plant Paints Quil" (Belgorod). The samples of the primer were tested on the following parameters: dispersibility, the degree of grinding, relative viscosity, hardness, drying time, adhesion and elasticity. The results showed that the proposed pigment-filler is of the same quality as the materials traditionally used for the production of primers. Thus the proof of the possibility and prospects of using TFQ and ceramsite dust as pigments-fillers in the manufacture of paints and varnishes is evident.

Abstract: In recent years, despite the significant improvement of sequencing technologies such as the pyrosequencing, rapid evaluation of microbial community structures remains very difficult because of the abundance and complexity of organisms in almost all natural microbial communities. In this paper, a group of phylum-specific primers were elaborately designed based on a single nucleotide discrimination technology to quantify the main microbial community structure from GuJingGong pit mud samples using the real-time quantitative PCR (qPCR). Specific PCR (polymerase chain reaction) primers targeting a particular group would provide promising sensitivity and more in-depth assessment of microbial communities.

Abstract: A total 408 SSRs were distributed in 18,181 ESTs sequences in Pinaceae in NCBI (National Center for Biotechnology Information) searched by SSRIT software, accounting for 2.24% of the whole EST sequences. We designed 132 pairs of EST-SSR primers by primer3. Of the designed 132 pairs, 29 pairs were able to produce an amplification product in the 10 Pinus koraiensis DNA samples, but only five primers in the 29 pairs exhibited polymorphism. Dinucleotide repeats were the most common repeat class. The repeated primitives of dinucleotide were 10, accounting for 52.73% of the whole repeated primitives; the repeat numbers were 87. The second most common repeat class was trinucleotide. The repeated primitives of trinucleotide were 27, accounting for 42.27% of the whole repeated primitives, and repeat numbers were 78.

Abstract: While chromates as anti-corrosion pigments in primers and wash primers have disappeared in most industries, there are still quite a lot of chromated paints used in the aircraft industry. Intensive efforts to develop alternative pre-treatments to chromate conversion coatings and to chromic acid anodization have begun. The intention of this report is to give an overview of the state-of-the-art techniques about such pre-treatment/coating systems of aluminium for aircraft maintenance, which are in accordance with the latest environmental policies. The objective is to evaluate the combination of surface pre-treatment and paint as a whole.