竹微粉炭尺寸與體積濃度對竹炭塗料性質之影響

Effects of Bamboo Micropowder Charcoal Size and Volume Concentration on the Properties of Bamboo Charcoal Coatings

本試驗係利用土窯產不同尺寸孟宗竹微粉炭（150、350及5000mesh）與展色劑（二液型聚胺基甲酸酯樹脂；PU），依不同體積濃度（10／100、30／100及50／100）調配成9種竹炭塗料，除分析各種尺寸微粉炭之基本性質外，亦探討各種塗料與塗膜性質及對甲醛之吸附效果，以獲得最佳體積濃度及微粉炭尺寸之竹炭塗料配方。試驗結果得知微粉炭愈細者之BET比表面積及微孔表面積愈高。竹炭塗料之固形份及黏度均隨微粉炭體積濃度之增加而提高，乾燥時間則縮短。添加微粉炭後之塗膜機械強度均較透明PU展色劑者為低，又含愈細微粉炭之竹炭塗料可得較佳之塗膜拉伸強度、破壞伸長率及硬度，但耐磨性較差。竹炭塗料之塗膜光澤度均較透明PU展色劑者為低，且有隨體積濃度增加而下降之趨勢，但微粉炭尺寸愈細者之塗膜光澤度較高；又所有竹炭塗料之塗膜附著性尚稱優良，塗膜耐溶劑性亦較透明PU展色劑者為佳。體積濃度30%且微粉炭愈細者具最佳之甲醛吸附效果。 In this study, various sizes of Moso bamboo micropowder charcoal (150, 350 and 5000mesh) produced from earth kiln were blending with vehicle (polyurethane resin; PU) by the different volume concentrations (10/100, 30/100 and 50/100), respectively, and 9 kinds of bamboo charcoal coatings were obtained. The fundamental properties of bamboo micropowder charcoals as well as the efficiency of formaldehyde adsorption and the properties of bamboo charcoal coatings were analyzed for obtaining the best coating formulation with the optimal size of bamboo micropowder charcoal and volume concentration. The results showed that the smaller size of bamboo micropowder charcoal the higher BET specific surface area and micropore surface area observed. The solid content and viscosity of bamboo charcoal coatings increased with increasing the volume concentration, while the adverse result was obtained for the shortening of drying time. The mechanical properties of bamboo charcoal coating films were inferior to those of PU vehicle film, and the smaller size of micropowder charcoal containing films had a better tensile strength, elongation at break and hardness, but poor adhesion resistance. The gloss of bamboo charcoal coating film also lowered than that of PU film and decreased with increasing the volume concentration. In addition, the smaller size of micropowder charcoal containing coating had a higher gloss of film. All of the bamboo charcoal coatings possessed an excellent adhesion of film and the solvent resistance was also better than PU film. The films with the volume concentration of 30% and smaller size of micropowder charcoal had the best formaldehyde adsorption efficiency.

In this study, various sizes of Moso bamboo micropowder charcoal (150, 350 and 5000mesh) produced from earth kiln were blending with vehicle (polyurethane resin; PU) by the different volume concentrations (10/100, 30/100 and 50/100), respectively, and 9 kinds of bamboo charcoal coatings were obtained. The fundamental properties of bamboo micropowder charcoals as well as the efficiency of formaldehyde adsorption and the properties of bamboo charcoal coatings were analyzed for obtaining the best coating formulation with the optimal size of bamboo micropowder charcoal and volume concentration. The results showed that the smaller size of bamboo micropowder charcoal the higher BET specific surface area and micropore surface area observed. The solid content and viscosity of bamboo charcoal coatings increased with increasing the volume concentration, while the adverse result was obtained for the shortening of drying time. The mechanical properties of bamboo charcoal coating films were inferior to those of PU vehicle film, and the smaller size of micropowder charcoal containing films had a better tensile strength, elongation at break and hardness, but poor adhesion resistance. The gloss of bamboo charcoal coating film also lowered than that of PU film and decreased with increasing the volume concentration. In addition, the smaller size of micropowder charcoal containing coating had a higher gloss of film. All of the bamboo charcoal coatings possessed an excellent adhesion of film and the solvent resistance was also better than PU film. The films with the volume concentration of 30% and smaller size of micropowder charcoal had the best formaldehyde adsorption efficiency.