Study On The Effect Of Properties Of UF Plywood Treated With BL-environmental-friendly Flame Retardant

Plywood has a long developing history and takes a important position in woo-based panels because it has many advantages, such as high specific strength, easiness to produce, maintaining natural pattern and properties of wood. Plywood is utilized to decorate, make furniture, pack and so on. So it has a close relationship with people's lives. Properties of environmental protection and flame retardation of plywood affect our lives and safeties directly. Based on practice, this paper researched environmental-friendly and fire-retardant plywood applied with BL-environmental-friendly flame retardant. The research can bring more than remarkable social and environmental benefits for people and society. Also it will broaden the developing space of plywood industry and produce some economic benefits. So the study is of important theoretical value and practical significance.The research did many innovative experiments about BL-environmental-friendly flame retardant and its properties were improved. Improving techniques and equipments has industrialized this technology. Factors affecting loading and methods manufacturing environmental-friendly and fire-retardant plywood were researched by single factor experiment and orthogonal test. With the help of oxygen index apparatus, smoke density apparatus, spectrophotometer, Fourier transform infrared spectroscopy (FTIR), environment scanning electron microscope (ESEM), thermo gravimetric analyzer and other interrelated experiment equipments, the following main results were obtained:1 .BL-environmental-friendly flame retardant has many advantages, such as low cost, easiness to produce, one reagent with two functions, environmental protection, and adapts to the situation of our country. Properties of the second generation BL-environmental-friendly flame retardant were improved with innovative research.2. Environmental-friendly and fire-retardant plywood with good properties can be manufactured by applied BL-environmental-friendly flame retardant. This new plywood is of more added value and international competitive capability.3.Plywood manufactured by soaking of individual veneer shows excellent properties. OI is above 60%. Formaldehyde emission is less than 0.5 mg/L and stabilizes in El rank. Properties of plywood manufactured by soaking of tow surface veneers are affected by layers directly. This method adapts to produce small thickness plywood, not more than five layers. Soaking of finished products is the third method. Plywood with this method is not satisfying and the highest OI is only 38% in experiments. These products can be used in places that are low restriction to properties of environmental protection and flame retardation. Plywood manufactured by interstratified veneer treatment shows good properties. OI is above 40%. Formaldehyde emission stabilizes in E0 rank. This process is lower costs and higher production efficiency than that of soaking of individual veneer.4. BL-environmental-friendly flame retardant has some negative effect on bond strength. We can make up the lost bond strength by means of controlling hot pressing technology and using urea-formaldehyde adhesive with high bond strength.5. Economic benefits analysis shows that BL-environmental-friendly flame retardant can bring plywood industry considerable economic benefits. Also this technology helps our factories break through vicious circle of low quality and low price and improve rank and competitive capability of our products.