论文部分内容阅读
为了更好的确定红麻杆人造板的生产工艺,参照国家标准对红麻杆各个不同部位的pH值和缓冲容量进行了研究,并将红麻杆的酸碱性和其他农作物秸秆及木材的酸碱性进行了对比研究,进而探讨了红麻杆酸碱性对脲醛树脂固化时间的影响。结果表明,红麻整杆平均pH值为6.60,偏弱酸性,酸、碱缓冲容量分别为16.05 mL和13.68 mL,总缓冲容量为29.73mL。研究表明,红麻杆从上部到底部,pH值呈逐渐降低的趋势,碱缓冲容量由小到大逐渐递增,酸缓冲容量由大到小逐渐递减,脲醛树脂的固化时间逐渐缩短。因此,在实际生产中,应适当增加酸性固化剂的用量,提高固化速率。
In order to better determine the production process of kenaf stick plywood, the pH value and buffering capacity of different parts of kenaf stick were studied according to the national standards. The pH and buffer capacity of kenaf stick were compared with those of other crop straws and wood Acid and alkali were studied comparatively, and then discussed the effect of konjac acid and alkali on the curing time of urea-formaldehyde resin. The results showed that the average pH value of kenaf whole mash was 6.60, the weak acidity, the buffer capacity of acid and base were 16.05 mL and 13.68 mL, respectively, and the total buffer capacity was 29.73 mL. The results showed that the pH value of the kenaf bar decreased gradually from top to bottom, the volume of caustic buffer gradually increased from small to large, the volume of acid buffer decreased gradually and the curing time of urea-formaldehyde resin gradually shortened. Therefore, in actual production, the amount of acid curing agent should be properly increased to increase the curing rate.