Modification Of Poplar Wood Combinatively With Glucose And N-methylol Resin

This thesis chooses the glucose which is inexpensive,easy to use,non-toxic,widely distributed in nature and green as the main reagent to modify Poplar wood.glucose can effectively reduce the use of petrochemicals that is commonly used reagents,expensive,large energy consumption,large side effects,potentially harmful to the environment and other defects in the modified wood.It conforms to the sustainable development strategy in economic,resources,environment coordination and common development.First,explore the weight gain rate and tensile strength of a quantitative filter paper modified by glucose mixture.the following principal factors be considered:The optimum concentration of the catalyst,the optimum curing temperature and curing time.To determine the best formula of glucose as a major modification reagent with other auxiliary reagents work together.Draw the following conclusions:(1)the weight percent gain after washing of filter paper modified by glucose was only 2%(this can be regarded as no effect),the WPG was 12%,when 1 wt.%the magnesium chloride catalyst exist with glucose.Glucose,1wt.%catalyst,5wt.%2D resin,the weight percent gain of filter paper rised.With the increase of the glucose concentration can not only improve the weight percent gain of the modified filter,but also be more firmly combined with the fibers,so its finite-span tensile strength enhanced(when the glucose concentration was 30 wt.%,the finite-span tensile strength of filter paper increased by about 80%),Simultaneously the zero-span tensile strength recover to the control group reduced by 2D resin.the zero-span tensile strength at high glucose concentrations consistent with the untreated wood.(2)Considering the weight percent gain and the tensile strength of treated sample obtained:in this experiment the best concentration of the magnesium chloride catalyst is l.wt%,optimum curing temperature is 140 ?,the curing time is 8h.(3)SEM and the fracture morphology of treated sample after finite-span tensile strength experiment seen:glucose can change the color of filter paper for tan,the section of the filter paper was regular,smooth and brittle fracture.Secondly,in view of the best formula of filter paper modified by glucose mixed solution,we research and analyze the main physical properties,mechanical properties and corrosion resistance of poplar sample modified by glucose mixed solution.Draw the following conclusions:(1)the weight percent gain of the wood modified with glucose,5wt.%2D and lwt.%magnesium chloride catalyst increased linearly with the increase of glucose concentration,when the concentration of glucose is 30 wt.%,increased to 56.8%;Glucose has a negative influence on the ASE,the ASE of treated wood decreased with the increase of glucose concentration,when the concentration of glucose was 30 wt.%,the ASE decreased to-11%;Resistance to water absorption(RWA)of treated wood increased with increasing glucose concentration,namely glucose in the formulation process can promote the RWA;the y of treated wood decreased with the increase of glucose concentration,show the material dim;while the a was increased with the increase of glucose concentration,sample more red(or less green);the ? and ?C*were also increased,the specimen more yellow(or less blue)and more vivid than before treatment;?E*difference value increases,the color change more.(2)MOE,MOR and the compressive strength of the wood modified with glucose,5wt%2D and 1wt%magnesium chloride catalyst increased with the increase of glucose concentration increases,when the concentration of glucose is 30 wt.%,increased by 26%,25.3%and 64.7%respectively;the processing failed to improve the impact strength of the wood,The end face of the specimen after impact became more and more smooth for brittle fracture,the color was more deep.(3)The material's corrosion level:untreated sample in three kinds of rot fungus have no resistance to corrosion,belong to(?)level;Sample treated with 5wt%2D and 1 wt%magnesium chloride catalyst in GT brown rot fungus and CV white-rot fungus have strong corrosion resistance,belong to(?)level,in GD2#local brown rot fungi have a little corrosion resistance,belong to(?)level;Sample treated with 5wt.%glucose,5wt%2D and 1wt%magnesium chloride catalyst in GT brown rot fungus have strong corrosion resistance,belong to(?)level,in CV white-rot fungus have a little corrosion resistance,belong to(?)level,in GD2#local brown rot fungus have no resistance to corrosion,belong to(?)level;The sample corrosion resistance level decreased with the increase of glucose concentration;In the mixed solution scheme,glucose have side effects on corrosion performance of the sample.(4)FTIR showed that the groups except the control and only glucose treatment group had absorption peaks between the wave number 1713cm-1 and 1740cm-1,the strongest absorption peak appeared in 2D resin with magnesium chloride-treated group,the presence of glucose reduced the absorption peak,it illustrates chemical reagents using in the processing combined with the timber via a carbonyl group(C=O)bond.In conclusion,this treatment has achieved a certain effect,the material weight gain,resistance to water absorption,equilibrium moisture content,ASE,MOE,MOR,compressive strength and anti-corrosion performance have different degrees of improvement.But how can better glucose fixed in the wood as the main modification reagent,thus improving the use function such as wood physical and mechanical aspects need further research.