Fir Liquefied And Influenced Of Different Amount Of Liquefaction On Fir Liquefied Products Phenolic Resin Performance

Compared with traditional fossil fuels, biomass of its renewable, low-pollution,zero emissions and other environmental effects are caused increasing attention, China's annual biomass resource is close to 8.78 million tons, and with the improvement of living standards of rural residents, this trend is rising. An important impact on the development and utilization of biomass materials to be will relieve energy pressure, improve the ecological environment.Nowadays utilization of woody biomass resources are mainly focused on two aspects,one is to retain its basic structure, to use of the original characteristics of woody biomass material and strength. Another way is the conversion of woody biomass resources,degradation biomass into small molecules to be used. Liquefaction of woody biomass resources is try to transform main chemical components in biomass such as cellulose,hemicellulose, and lignin into liquid substances, through the physical, thermal, chemical methods and biotransformation methods in the preparation of biological adhesives, energy,raw materials, molding materials, foam, carbon fiber, and feed and organic fertilizer.In order to fully understand the development of wood material liquefied field, we collected a large number of documents and summarized, summarized the raw materials used in liquefaction, liquefaction method, liquefaction reactions influencing factors, and the liquefied product used.In this paper we used fir as raw materials, with a certain concentration of sodium hydroxide solution, liquefied at high temperature in a sealed container to obtain alkaline fir liquefaction product and optimized by single factor experiment of the liquefaction process.we also studied the i Influenced of different amount of liquefaction on fir liquefied products-Phenolic resin performance. Using FTIR instruments to analysis wood liquefaction and the group changes of resin, by means of DSC to study the curingtemperature, curing time and curing enthalpy of resin. In this paper, we have the following conclusions:1. The optimum liquefaction reaction conditions: liquefaction temperature 240 ?,liquefaction time 30 min, the ratio of sodium hydroxide added and wood mass is 1:1, the amount of glycerol added with wood mass ratio is 1:1, under this condition, liquefied residue rate of 1.11%, and is conducive to energy conservation.2. The effect of the amount of different fir liquefaction added on the basic properties of the liquefaction-phenol resin was studied in the formaldehyde / phenol molar ratio was2:1, and the resin viscosity was 3000 m Pa·s. It is found that the liquefaction add affect the amount of solid content of the resin is relatively large, with liquefaction addition amount increases gradually, the solid content of the resin showed obvious downward trend, when liquefied Chinese fir addition amount from 100% increased to 180%, the solid content of the resin from 48.71% reduced to 42.09%; free formaldehyde content decreased gradually,when the adding amount is increased from 100% to 140%, the free formaldehyde content of the resin decreased rapidly from 0.31% to 0.12%, continue to increase liquefaction addition did not have a significantly decreased on the free formaldehyde content; but the content of free phenol increased with the increase of the amount of fir liquefaction. The amount of the liquefaction increased from 100% to 180%, the free phenol content of the resin increased from 0.78% to 0.99%.3. Fir liquefaction-phenolic resin bonding strength and formaldehyde emission decreased with fir liquefaction amount added. When the liquefied amount increasing from100% to 180%, the bonding strength of resin from the 1.73 MPa declined to 0.77 MPa,decrease reached 55.5%; at the same time when higher than 160 percent of liquefaction addition, no free formaldehyde release been measured under the existing experimental conditions. To meet the resin bonding strength an appropriate increase in fir liquefied added not only reduce the amount of plywood formaldehyde emissions, but also reduce the cost of synthetic resin.4. Compared to original and liquefied fir FTIR spectra, fir powder in the high temperature and pressure under alkaline conditions, the lignin, cellulose and hemicellulose had hydrolysis reactions and degradation reaction after hydrolysis. Fourier transforminfrared spectra shows fir liquefied product condensated with phenol and formaldehyde, the generated degradation products with phenol and formaldehyde under alkaline conditions,the reaction occurs to produce a polymer product.5. Fir liquefaction addition have a significant effect on liquefaction-phenolic resin curing characteristics. As the increased volume of liquefied, the resin moves to higher temperature curing; fir liquefaction-phenolic resin curing time and curing enthalpy increased with the increasing of added amount.