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Strength and physical properties of structural type particleboards.

结构型刨花板的强度和物理性能。

基本信息

批准号：
61560199
负责人：
KAJITA Hiromu
金额：
$ 1.09万
依托单位：
Kyoto Prefectural University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61560199/
关键词：
Particleboard Oriented strand board Impredg Phenolic resin Dimensional stability 木材の化学加工

项目摘要

The effects of adding a low molecular weight(Mn=389) phenolic resin to particles on board properties were investigated. Strand particles,prepared from sugi(Cryptomeria japonica)thinnings,were treated with a water-dispersed phenolic resin by the dipping or spraying method. In addition,8% bonding phenolic resin(Mn=962) was sprayed to the particles. On the other hand,the one shot spraying method,which the mixture of impregnating and bonding resin is sprayed to particles,was used. The particles were aligned by means of a mechanical orienter and 10-mm thick single layer boards were produced. The bending properties of the boards increased with the increases in board density and also MOR in the oriented direction was about twice that of random boards. At a board with 10% impregnating resin, the 90 percent of the original MOR was retaianed after a 2-hour boil test. The phenolic resin impregnated particleboards showed greatly improved thickness swelling and exhibited only about one-half the thickness swelling of a control board. Linear expansion (LE) values measured for the range of conditionings at 50 to 90%RH were affected substantially by particle alignment. After six cycles of ASTM accelerating aging,TS of the board with 10% impregnating resin decreased approximately up to 50% of the values observed in control boards and the internal bond strength retention was outstanding. The one shot spraying method is the most effective and it seems to be practical.

研究了添加低分子量（Mn=389）酚醛树脂对颗粒板性能的影响。以柳杉间伐材为原料，采用浸渍法或喷雾法，对柳杉间伐材进行水分散酚醛树脂处理。此外，还将8%的粘结性酚醛树脂（Mn=962）喷涂到颗粒上。另一方面，采用一次喷射法，将浸渍树脂和粘合树脂的混合物喷射到颗粒上。通过机械定向器使颗粒对齐，并生产10 mm厚的单层板。板材的弯曲性能随着密度的增加而增加，取向方向的莫尔强度约为无规板材的2倍。在含10%浸渍树脂的板上，经过2小时的煮沸试验后，保留了原始莫尔的90%。酚醛树脂浸渍的刨花板显示出极大改善的厚度溶胀，并且仅显示出对照板的厚度溶胀的约一半。在50至90%RH条件下测量的线性膨胀（LE）值基本上受颗粒排列的影响。在六个循环的ASTM加速老化后，具有10%浸渍树脂的板的TS降低了在对照板中观察到的值的大约高达50%，并且内部粘结强度保持率是突出的。一次喷雾法是最有效的，而且似乎很实用。