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Improvement of Properties of Particleboard by Impregnation with Phenolic Resin.

通过酚醛树脂浸渍改进刨花板的性能。

基本信息

批准号：
01560193
负责人：
KAJITA Hiromu
金额：
$ 1.28万
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：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

Particleboards(PB)were treated with a low molecular-weight phenolic resin and their properties were evaluated. Particles were dipped into aqueous solutions of resin or sprayed with resin solutions before spraying the conventional phenolic resin adhesive, or sprayed with a mixture of low molecular-weight resin and the adhesive resin in a single step. Though mechanical properties and dimensional stability of the phenolic resin treated boards were affected considerably by the incorporated resin loadings(IRL), the methods of treatment did not produce significantly different results. After boiling for 2-hours, the boards treated at 10 % IRL retained 80 % of their strength values in the dry condition. The internal bond strength(IB)increased with increasing IRL values, and the boards with 20 % IRL showed twice the value of untreated controls at the same level of board density. Treated PBs showed a dramatic reduction in the rate of swelling even at low resin loading. Results obtained from accelerated laboratory tests of biodegradation suggested that incorporated resin-solids worked well to enhance decay and termite resistance of boards. For a brown-rot fungus, the weight loss was substantially reduced at 15 % IRL, whereas attack was suppressed almost entirely even at low resin loadings for the white-rot fungus.The specimens of treated and untreated PBs were subjected to various accelerated aging treatments, and thickness swelling(TS)and IB were measured after each step of each cycle. The TS after the 6-cycle ASTM D-1037 exposure was affected greatly by the addition of low molecular-weight phenolic resin ; the TS value of the PB with only 5 % IRL was about a half of that of the control boards. The spring back was rarely observed for the treated PBs with 20 % IRL after the cyclic exposure test.The combination of low- and high-molecular weight resin was found to be much more effective in improving the strength properties and the dimensional stability of PBs.

用低分子量酚醛树脂对刨花板进行表面处理，并对其性能进行评价。将颗粒浸入树脂的水溶液中或在喷涂常规酚醛树脂粘合剂之前用树脂溶液喷涂，或在单个步骤中用低分子量树脂和粘合剂树脂的混合物喷涂。虽然机械性能和尺寸稳定性的酚醛树脂处理板的影响相当大的树脂加载量（IRL），处理的方法没有产生显着不同的结果。煮沸2小时后，在10%IRL下处理的板保持其在干燥条件下的强度值的80%。内部结合强度（IB）随着IRL值的增加而增加，并且在相同的板密度水平下，具有20%IRL的板显示出未处理的对照的值的两倍。即使在低树脂负载下，处理的PB也显示出溶胀速率的显著降低。从加速生物降解实验室测试获得的结果表明，纳入树脂固体工作良好，以提高腐烂和白蚁的阻力板。对于褐腐真菌，在15%IRL下，重量损失显著降低，而对于白腐真菌，即使在低树脂加载量下，攻击也几乎完全被抑制。处理和未处理的PB的试样经受各种加速老化处理，并且在每个循环的每个步骤之后测量厚度溶胀（TS）和IB。6个循环ASTM D-1037暴露后的TS受添加低分子量酚醛树脂的影响很大;仅具有5%IRL的PB的TS值约为对照板的TS值的一半。经20%IRL处理的聚丁二烯在循环暴露试验后几乎没有观察到回弹现象，低分子量树脂和高分子量树脂的组合在提高聚丁二烯的强度性能和尺寸稳定性方面更为有效。