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Study on the Wood Adhesive Base on Concentrated Black Liquid Lignin

Author: ZhanJunZhi
Tutor: GanWeiXing
School: Guangxi University
Course: Wood Science and Technology
Keywords: Papermaking black liquid Hydroxymethylation Orthogonaldesign Uniform design Artificial neural network
CLC: TQ437
Type: Master's thesis
Year: 2013
Downloads: 66
Quote: 0
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Abstract


The concentrated Neosinocalamus papermaking black liquor was added into wood adhesive in high capacity by chemical copolycondensation method in this paper.First,the concentrated papermaking black liquor was modified directly by hydroxymethylation, enhance the activity of lignin without the need for extracting and purifying.Compared with two kinds of modified scheme,based on the better scheme, the modified black liquor was added into urea-formaldehyde resin (UF), phenolic resin (PF) and melamine formaldehyde resin (MF).Phenol and melamine,which were toxic and expensive, were substituted in high capacity for copolycondensation with formaldehyde.New environment-friendly lignin urea-formaldehyde resin(LUF), lignin phenolic resin(LPF) and lignin melamine formaldehyde resin(LMF) were prepared.The bonding strength of plywood with three layers was been as the main index and the effect interaction relation between each experimental factor and index were analysed by single factor method, orthogonal design, uniform design method and the construction of artificial neural network.The better processing parameter was determined by range analysis, stepwise regression analysis, grid optimization method and genetic algorithm.Unmodified UF,PF and MF were compared with the cost-benefit analysis. Structural change effect on the properties of such adhesive was investigated by Fourier transform infrared spectrum(FT-IR). The research results were as follows:1.The effect of high temperature hydroxymethylation modification of concentrated black liquor was better than normal.The better black liquor modification process was that the quality ratio of formaldehyde and papermaking black liquor was0.5:1, pH value of reaction solution was10.2.No matter what the modified concentrated black liquor was added into urea-formaldehyde resin in alkaline or acidic polycondensation stage, the bonding property of synthetic adhesive was poor.The bonding property was improved by adding melamine. The better process parameters was that the quality percentage of papermaking black liquor and urea was20%, the molar ratio of urea and formaldehyde was1:1.5,the quality percentage of melamine and resin was2%. Three layers plywood was prepared by the better process parameters,whose strength was0.7153Mpa,reached the national standard (GB/T14732-2006) class II plywood requirement (≥0.7Mpa).3.The better preparation process condition of LPF was that the quality percentage of papermaking black liquor and phenol was111%,the molar ratio of phenol and formaldehyde was1:3.1,the quality percentage of sodium hydroxide and resin was4%. Three layers plywood was prepared by the better process parameters,whose strength was0.9124Mpa,reached the national standard (GB/T14732-2006) class I plywood requirement (≥0.7Mpa). 4.The better preparation process condition of LMF was that the molar ratio of formaldehyde and melamine was2.8:1, the mass percentage of papermaking black liquor and melamine was30%,the mass percentage of stabilizer and resin was6%.Three layers plywood was prepared by the better process parameters,whose strength was0.7892Mpa,reached the national standard (GB/T14732-2006) class I plywood requirement (≥0.7Mpa),and the prediction error of genetic algorithm based on artificial neural network was15.8%.5.The main units structure of papermaking black liquor lignin was syringyl propane structure from the FT-IR spectra.The impurities of papermaking black liquor had no characteristic peaks changes.The change information of hydroxymethyl was reflected through the absorption peak of methyl,methylene and methyne.6.The cost price of LUF was20yuan per ton lower than that of UF; The cost price of LPF was1849yuan per ton lower than that of PF; The cost price of LMF was272yuan per ton lower than that of MF. The adhesive had a high cost benefit.

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CLC: > Industrial Technology > Chemical Industry > Adhesive Industry > All purpose adhesive
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