| China is abundant in bamboo resources. Developing bamboo- processing industry is an important approach of solving wood supply gap currently. As bamboo is rich in nutrients, it is liable to rot, mildew, infesting and so on in the preservation and use. A study of anti-corrosion and anti-mildew technique has very important significance to develop bamboo resources efficiently.In this paper, we chose pressed bamboo strip as the material. Three kinds of mould fungi and two kinds of decay fungi were used as main harmful bacteria. In order to choose the appropriate preservative for recombination bamboo timber of outdoor furniture, the pressed bamboo strip was treated by five environment-friendly water-borne preservatives and then tested the properties. On the basis of this, this paper studied preservation and production process of outdoor strand recombination bamboo timber. Then the verification was tested, and this process was used in the pilot test successfully. A good comprehensive anti-corrosion recombination bamboo timber used in outdoor furniture was developed. The results of this study are summarized as below.1,Five preservatives were used on the pressed bamboo compared with the untreated group. The result showed that the physical and mechanical properties of the pressed bamboo were higher than the standard. Reconstituted bamboo itself has natural decay resistance. The loss rate of the five preservatives group and the untreated group were all below 11%, which reached the high anti decay level.The decay resistance of reconstituted bamboo on brown-rot fungi was higher than on white-rot fungi. The weight lose rate of white-rot was 10.11%, while that of brown-rot was 6.84%. The decay resistance of the untreated group was weak, which appeared white mycelium on the surface of the raw materials in a week and mildewed in 28 days. The decay resistance of reconstituted bamboo by the five preservatives were improved significantly.Considering the price of preservatives, leach resistance and other factors, the comprehensive properties of ZJFC-Ⅰwas the best one. Therefore, we chooses ZJFC-Ⅰas the preservative in the production of the outdoor recombination bamboo timber.2,Orthogonal experimental was adopted to obtain the reasonable vacuum-pressure in the preservative-treated process the bamboo. Based on the anti-mold effectiveness, the effect factors were investigated, including the preservative concentration, molding pressure and pressing time. The result showed that the concentration of preservative was the important factor in influence the bamboo preservative retention, then the molding pressure and the pressing time. The optimal choice of preservation process was:preservative concentration was 0.8%, molding pressure was 1.2MPa, and pressing time was 4h.Under these conditions, anti-mold effectiveness was 92.33%. 3,Orthogonal experimental was adopted to obtain the reasonable production process. The effect factors were investigated, including density of the timber, the time of impregnation and glue strength. The result showed the density of the timber was the important factor, then glue strength and the time of impregnation. The optimal choice of production process was:density of the timber was 1.1 g/cm3, the time of impregnation was 30 min and glue strength was 28%.It was need to solidifying stereotypes after the cold-press process. There are four stages in the process. It was under the temperature of 100℃continuing 120 min,then 135℃continuing 120min,then 125℃continuing 180min,and then 80℃continuing 60min.4,It was possible to use ZJFC-Ⅰin the production of outdoor recombination bamboo furniture by experiment in laboratory and factory.Good physical and mechanical properties, well processing properties, excellent surface decoration properties, anti-mildew and anticorrosive properties were found in the timber. The research of outdoor recombination bamboo timber had wide space for development and expanded application fields of bamboo and created good environmental and economic benefits. |
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