Study On The Modification And Antisepsis Capability Of Soy Based Adhesive

Firstly, sodium hydroxide(NaOH), sodium dodecyl benzene sulfonate (SDBS),2-mercaptoethanol and urea were used to modify soy protein isolates(SPI) in this research. The orthogonal experiment L9(34) was carried out. The best technology condition was pH of 9, SDBS with 2.5wt% (SDBS/SPI),2-mercaptoethanol with 3wt%(2- mercaptoethanol/SPI) and urea with 6wt%(urea/SPI)(SPI with 15g, water with 100mL). The best hot-pressing technology was:the hot- pressing temperature was 160℃, the hot- pressing pressure was 1. 6MPa, the hot- pressing time was 200s/mm and glue spread was 400 g/m2. The samples were characterized by Mechanical Testing Machine, Contact Angle Crysocope, Dynamic Scattering Instrument, Infrared Spectrometer, Differential Scanning Calorimetry Instrument, Thermo Gravimetric instrument. The results indicated that the water-resistant shear strength of modified soy adhesive was improved, the contact angle of modified soy protein film was increased, soybean protein particle size became bigger, the distribution of particle size growed wider, the levels of non- polar groups were added, the enthalpy of soy adhesive became lower, the rate of lostmass of adhesive in the first step decreased. These all show that the modified soy protein adhesive structures become more stretch.Secondly, the epoxy resin was used to modify soy protein adhesive. According to the single factor experiment and the orthogonal experiment L9(34), the best technology condition was:the pretreatment time was 2h, the reaction time was 2h, the reaction temperature was 60℃, the epoxy resin was 14g, Emulsifier OP was 0.5g and three ethylene diamines was 0.4g. The results of FTIR, DSC and TG showed that there were chemical reactions between soybean protein and the epoxy resin.Finally, the antibacterial anticorrosive experiments were done by mixed bacteria adopted from soil and white-rot fungus (Coriolus versicolor) easily accompanying with the wood, which studied the effects of different preservatives on the antibacterial ability of soybean protein adhesive. The best preservatives was Canol- FJ801 preservatives. Its dosage was 0. 4wt%(relative to the soy protein glue). When it was put in the laboratory, there was still no discolored and no corruption in the added Canol- FJ801 preservatives soy adhesive. Moreover, the water- resistant shear strength was more than 1.2MPa.