Study On Complex Of Camphor Leaves Extractive And Its Effect On Bamboo Preservation

As a even more environmental friendly new protection than the chemical protection, plant-based protection will be an important research tendency in the future. Development of a plant-based protection for bamboo protection can widen their applications.The extractive of camphor leaves was determined to be the main substance studied in this research through the screening of the function of bacteriostat in ten plant extractives. The process for extraction was optimized, the extractive was mixed with MFU, and the mixed reagent was prepared with decay resistance, heat resistance effect. Aiming at founding the foundation for the plant-based bamboo protection, the function and mechanism of bacteriostat were researched. The main research findings were summarized as follows:The traits of water and benzyl-alcohol extractives stemming from camphor leaves, europhylla leaves, Chinese Fir leaves, and Korean pine leaves were observed. As the compounds of extractive were different with different solvent, and the traits of extractive were also different. The decay resistance function of camphor leaves was the best, so the extractive of camphor leaves was used as the main material for developing plant-based protection.The extractive of camphor leaves by SFE CO₂ and MAE was analyzed respectively. And the surface chemical composition and structure of treated residue was analyzed by XPS, which can forecast the effects of extract method to lignin and cellulose of camphor leaves, and the method of extract was determined. The extractives contain D-camphor, caryophyllin, encalyptole, linalool,α-terpineol, and 4-terpineol, which have an antibacterial, desinsectization, antiviral, decay resistance effect. The process for extraction was set down as: in 70℃extract 15min, and liquid-to-solid ratio was 12:1, the power of extract was 500w. The extraction efficiency of camphor leaves was 2.514%.The extractive of camphor leaves was mixed with MFU (10% extractive and 10% MFU), the decay resistance of mixed reagent wasn't clearly different by comparing with the extractive. But the mixed reagent had more lasting decay resistance than the extractive of camphor leaves, because the active composition of extractive was coated by MFU. The general trend of FTIR spectra for MFU was accord with the mixed reagent, and there was no new characteristic peak appeared. So the mixed was physical mixed, and the mixed reagent didn't exist new substance. The order of heat resistance was: MFU>mixed reagent>extractive of camphor leaves. According to the pyrogenation rate equation, the dynamies parameters of samples were calculated to obtain activation energy E and the equation of samples.The optimal vacuum-pressure preservative impregnation parameters for bamboo treatment are: pre-vacuum keeping time 30min, pre-vacuum pressure -0.08Mpa, treated pressure 0.8Mpa, keeping time 2h. After treated by mixed reagent, the parenchyma cells around the vascular budles of bamboo existed ball granule. The ball granule didn't exist in untreated bamboo. When the treated bamboo was heated, MFU polymerized. So the ball granule in bamboo was micro-capsule of mixed reagent that the active composition of extractive was coated by MFU. The structure of micro-capsule was beneficial to control release of active composition.The antimold, antistain, decay resistance effect of bamboo treated by mixed reagent was the best with the average weight lost of 6.07%; the bamboo treated by extractive was the secondary with the average weight lost of 16.39%. And the antimold, antistain, decay resistance effect of bamboo treated by extractive was far better than untreated bamboo. The average weight lost of untreated bamboo was 37.28%. The decay resistant grade of bamboo treated by mixed reagent reached to strong decay resistant, treated by extractive reached to decay resistant, the untreated reached only to slightly decay resistant. So the mixed reagent may serve as a plant-based protection to develop.The vessels were the primary path that the mycelium spread in bamboo, the parenchyma cells were destroyed badly, and the place near tabasheer was attacked hardest. Cellulose was easier decomposed by brown-rot than write-rot according to FTIR, XPS analysis, and lignin was easier decomposed by write-rot than cellulose. The decay resistant of bamboo treated by mixed reagent was strongest. The extractive of camphor leaves contained linalool, D-camphor,α-terpineol, caryophyllin by GC/MS analysis. It was concluded that the decay resistant of treated bamboo might be caused by both 4 composition.