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The Effect of Low Temperature Plasma Treatment on Painting Film Properties of Solid Wood Floor Surfa

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Tutor: HuangHeLang
School: Nanjing Forestry University
Course: Wood Science and Technology
Keywords: plasma,solid wood floor,surface wetting properties,surface chemical element,film
CLC: TS653
Type: Master's thesis
Year:  2013
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Different wood species¡¯s structure varies from each other£¬ they consist different level ofinclusions.Too much inclusions have impacts on the physical or chemical properties of woodsurface£¬especially the painting property of the latter processing period£¬and bring out adecreased wetting property.So the demind of these species of wood for flooring decease aswell£¬and we call them timber with poor painting property. Therefore, it is necessary to put thesetimbers into modified processing to improve their painting properties and provide technicalsupport for the application of solidwood in flooring industry.In the thesis£¬we are aim at improving the surface wetting properties and film propertiesthrough the plasma treatment technology and take the following five species Tabebuia spp.,Dipteryx sp., Manilara spp., B.confusa Hoyle, Pometia tomentosa, whose painting property istroublesome, as specimen to study the properties of modified wood surface. We¡¯ve studied thesurface topography£¬chemical properties and structure of the modified surface by means of SEM,infrared spectroscopy and other analytical test methods. The main conclusions are as follows:1£©We¡¯ve taken five species of wood like Tabebuia spp as specimen to study the optimaltreatment process by the means of orthogonal experimental design with the surface plasmatreatment technology. The study shows that the surface wettability after plasma treatment hasimproved greatly, the optimal treatment processes of these five species are:Tabebuia spp.current2.5A, handling time15s, processing distance12mm; Dipteryx sp. current2.5A£¬processing time15s, processing distance of10mm; Manilara spp. current2.5A, processingtime15s, processing distance12mm; B.confusa Hoyle processing current2A, the processingtime is10s, processing distance10mm; Pometia tomentosa processing current2.5A, processingtime15s, processing Distance12mm. With the extension of storage time, the contact angle ofeach species increases,but the surface modification effect deteriorates.The timeliness of theorder is Tabebuia spp.¡ÖDipteryx sp> B.confusa Hoyle> Manilara spp.> Pometia tomentosa.2£©We¡¯ve also studied the chemical properties and structure of these species¡¯ surface bymeans of SEM, infrared spectroscopy and other analytical test methods. The results show that:after the plasma treatment, the unevenness, etching and increase of roughness happens on thewood surface. The content of oxygen£¬O/C and hydrophilic groups increases, but the carbondecrease.They are the internal reasons why the wetting property of modified timber improves.3)We¡¯ve studied the variation of the film properties on these species¡¯ surface after plasma treatment. Theresults show that the film adhesion on Tabebuia spp.¡¯s surface increases56.2%, from0.477kN to0.742kN, means an apparent improvement on film adhesion property;the result on Dipteryx sp.surface increases5.8%, from0.621kN to0.657kN;the result on Manilara spp.surface increases29.8%, from0.611kN to0.793kN;the result on B.confusa Hoyle surface increases3.8%£¬ from0.796kN to0.826kN;the result on Pometia tomentosa surface increases19. 8%,from0.808kN to0.824kN;each specie gains a improvement on film adhesion property.We¡¯ve also studied the variation of the film properties on these species¡¯ surface. The resultsshow that the Tabebuia spp.¡¯s film adhesion level without plasma treatment is3, but it increaseto2after plasma treatment, the effect is obvious. The Dipteryx sp.¡¯s film adhesion levelwithout,or with plasma treatment are both2, but the paint peeling rate after the plasmatreatment decreases from7.7%to6.8%,which means a slight increase of film adhesion. TheManilara spp.¡¯s film adhesion level without,or with plasma treatment are both2, but the paintpeeling rate after the plasma treatment changes from11.2%to6.4%,which shows an slightincrease. The B.confusa Hoyle¡¯s film adhesion level without,or with plasma treatment are both2, but the paint peeling level after the plasma treatment changes from2to1,which shows anapparent effect. The plasma treatment on the Pometia tomentosa is not obvious. The meanvariation of film thickness on each species surface after plasma treatment is not obvious, itchanges between104-123¦Ìm£¬which meets the requirement of the film thickness; but thestandard deviation of the film thickness changes significantly.The film thickness on theTabebuia spp., Manilara spp., Dipteryx sp.£¬ B.confusa Hoyle, Pometia tomentosa hasdecreased5.31%,2.22%,2.39%,0.93%and2.26%orderly. Consequently, the film thicknessuniformity of each wood species improves after the plasma treatment.
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