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Study on Environmentally Friendly and Antibacterial Wood Multi-layer Floor

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Tutor: ZhangYang
School: Nanjing Forestry University
Course: Wood Science and Technology
Keywords: antibacterial,bean gum,Wood Multi-layer Floor,Fourier transform infrared,thermal
CLC: TS653
Type: PhD thesis
Year:  2013
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In order to achieve the antibacterial function of the multi-layer parquet and reduce the freeformaldehyde release rate, the non-formaldehyde bean gum engineered wood flooringmanufacturing process and properties of the substrate, as well as multi-layer parquetantimicrobial treatment process and performance are studied. Papers are discussed from theanalysis of the mechanism of adhesive bonding, aldehyde bean gum poplar wood flooringsubstrate manufacturing process, antimicrobial parquet manufacturing process and performancetesting, and its main contents and conclusions are as follows:In analysis of adhesive bonding mechanism, Industrialization bean gum and laboratorymanufacturing bean gum are detected and analyzed by Differential scanning calorimetryinstrument (DSC), Fourier transform infrared spectroscopy (FTIR), and thermal gravimetricanalysis (TG).Through FTIR analysis,the result showed that soy protein secondary structure offactory bean gum Under the conditions of160¡æfor5min exhibit a distinct change becauseof all alpha-helical transformed into beta-fold. It indicated that the chemical reaction lead to thedecomposition of small molecules and the same time structural of the soybean meal andurea-modified guar gum change hardly in the conditions of160¡æfor5min.It indicated thepure soy protein still has strong stability. Though DSC analysis£¬the result showed that glasstransition temperature of the factory bean gum and pure soy protein both are about70¡æ, but inthe case of high temperature (200¡æ-250¡æ),the urea-modified guar gum will decompose theurea. It showed high temperature thermal stability of that is poor than pure soy protein andIndustrialization bean gum. Though TGA analysis,the result showed that the weight loss rate ofurea-modified guar gum is bigger than The industrialized bean gum and pure soy protein indetection temperature range.In the study of aldehyde-free bean gum poplar parquet substrate manufacturing process,the effect of glue content, pressing time, pressing pressure (high pressure), pressing temperature,preheat pressure temperature and Hot pressing pressure for bonding strength of multilayerpoplar wood flooring substrate by non-formaldehyde bean gum are studier by multi-factorfactor rotation method. on the basis of comprehensive analysis, and ultimately to determine theoptimal process conditions: the glue content of450g/m~2(double-sided), hot pressing pressure of2.0MPa, pressing time of70s/mm, the preheating pressure temperature of110¡æ, the hottemperature of160¡æand hot pressure of1.6MPa is the best. At the same time, a mathematicalmodel of the pressing time is established on the basis of surface layer and core layertemperature change about multi-layer bean gum plywood. In the research of enhancing surfaceboard of engineered wood flooring, poplar and fir compression process are optimized bymulti-factor factor rotation method. The result showed that the best compression temperature is195¡æ, compression time is1.5min/mm and compression rate is45%.In the study of antimicrobial parquet manufacturing process£¬the effect of different typesof antimicrobial agents and dispersants to antibacterial properties of the parquet by single factortest method.The result showed the antibacterial effect of HTB-032containing silver hydroxyzirconium phosphate nano-antibacterial agent is the best and at the same time best dispersantfor for HTB-032type containing silver hydroxy zirconium phosphate sodium antibacterialagent is hexametaphosphate. When adding1%of the antimicrobial agent in the photosensitive paint or the melamine resin in processing wood flooring, its antibacterial rate which are testedreference to the standard QB/T2591-2003about antibacterial Plastics-Test method forantibacterial properties is up to99%, and can be assessed as strong antibacterial products.Reference to "disinfection technical specifications "which is issued by the Ministry of Health ofthe People¡¯s Republic of China (2008), The antibacterial effect of quaternary ammoniummodified montmorillonite and quaternary ammonium and silver ions composite modifiedmontmorillonite composite antibacterial agent which are manufactured by the laboratory, arecompared by antibacterial Tour de France test. The result showed that antibacterial effect ofquaternary ammonium salt compound of silver ions antibacterial agent is better than others, andwith the increase of the added amount of the composite antibacterial agents, the antibacterialperformance has improved significantly. It indicated that When adding3%compositeantibacterial agent into the paint and melamine resin, the diameter of inhibition zone is up to15mm and25mm respectively.By analyzing free formaldehyde and VOCs emission in the environmental performance ofthe antibacterial parquet, the results showed that free formaldehyde emission of theenvironmentally friendly antibacterial parquet reached Class A lever of the national standardGB/T18103-2000about parquet, and the values of free formaldehyde emission by coatingsand melamine resins on surface are7.2mg/100g and8.4mg/100g; The results also showed thatvolatile organic compounds (VOCs) emission reached the requirements of environmentalstandards HJ571-2010about environmental labeling products technical requirements forwood-based panels and their products, and the values of VOCs emission by coatings andmelamine resins on surface are0.164mg/m~2h and0.386mg/m~2h, They indicated antibacterialwood flooring has superior environmental performance. According to the the material toxicityanalysis, the results show that the secure of environmentally-friendly antimicrobial parquet ofwhich the cytotoxic were rating2than wood raw material.
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