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Production of plastic-like moldings from fast growing tree's barks

利用快速生长的树皮生产类似塑料的模制品

基本信息

批准号：
12839007
负责人：
YANO Hiroyuki
金额：
$ 2.43万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12839007/
关键词：
tannin Acacia Mangium Bark Fast growing tree Moulding Adhesive Mechanical Property Water durability 耐水性再生可能資源プラスチック

项目摘要

Wiley-milled Acacia mangium outer bark samples were fractionated using a series of sieves according to their bark particle size. The extractive yields were affected by bark powder particle sizes regardless of the solvent ratio and extracting time, and at fractions under 45[], more than 50% methanol extractive yields were obtained. The average adjusted Stiasny value for the extractives was 94.5%, indicating that the tannin rich and is concentrated in the the small particle fractions. The gelation time of the mixture of methanol extractive formalin and water fenwith increasing pH from 4 to 8. Plywood was produced using lauan (Shorea spp.) rotary lathe veneers and adhesives prepared from bark powder with a particle size of lee than 63 [], paraformaldehyde and water. A shear strength of 11.7.kgf/cm2 after 72 hrs immersion in boiling, which complies with the requirement of the JIS K6802 for exterior-grade plywood, was attained. When the bark powder was added to a phenolic resin with 20% by weight of solid content of resin, the hot pressing temperature to obtain exterior-grade plywood could be reduced. Moulding products using a mixture of the bark powder and pulp in the ratio of 7:3 attained a bending strength of 80 MPa. After cold water immersion for 24 hrs, the bending strenght reduced to 70MPa.

Wiley研磨的马占相思外树皮样品根据其树皮颗粒尺寸使用一系列筛分级。树皮粉粒度对甲醇提取率的影响与溶剂比和提取时间无关，在45[]以下的馏分中，甲醇提取率可达50%以上。提取物的平均调整Stiasny值为94.5%，表明单宁丰富且集中在小颗粒级分中。甲醇提取液、甲醛溶液和水溶液的混合物在pH值从4增加到8时的凝胶时间。胶合板是使用柳杉（Shorea spp.）由粒径小于63 []的树皮粉、多聚甲醛和水制备的旋切单板和粘合剂。在煮沸中浸泡72小时后，获得了11.7kgf/cm 2的剪切强度，其符合JIS K6802对室外级胶合板的要求。将树皮粉添加到树脂固含量为20%（重量）的酚醛树脂中，可降低获得室外级胶合板的热压温度。使用比例为7：3的树皮粉末和纸浆的混合物的模塑产品达到80 MPa的弯曲强度。冷水浸泡24小时后，抗弯强度降至70 MPa。