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Preventive method against exudation of wood resin by chemical conversion

化学转化防止木质树脂渗出的方法

基本信息

批准号：
02556022
负责人：
KAI Yuji
金额：
$ 5.7万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

(1) Prevention of resin exudation and light-induced discoloration in woodA treatment with semicarbazide prevented resin exudation in the woods of kuro-matsu, Japanese larch and Siberian larch as well as Douglas fir wood. This treatrment also prevented light-induced discoloration in Douglas fir and kuro-matsu woods, but accelerate it in the woos of both larches.(2) Inpregnation of chemicals into woodIn regard to impregnation into Douglas fir wood, it was found that 1) a stage of decoimpression before pressurization was effective, 2) it was more effective that pressure under 1 Kg/cm2 per minute was added on the process of pressurization, 3) maximum pressure above 13 Kg/ c, -. 92 was necessary, 4) the optimum moisture content in the wood was 17%.(3) Changes of resin components during a treatment with semicarbazideDuring a semicarbazide treatment, it was found that a part of resin components was dissolved in a semicarbazide solution or converted to n-hexane insolubles, and 1.48 - 0.59% of nitrogen was introduced into the residual resin coriponents to increase the viscosity of it.(4) Painting of the wood treated with semicarbazideThe Douglas fir wood treated with seiaicarbazide did not have the troubles in painting, and not decrease the effect of prevenntion against light-induced discoloration.(5) Adhesive property of the wood treated with semicarbazideIt was found that the Douglas fir wood treated with semicarbazide did not obstruct the ability of vinyl acetate resin adhesives.

(1)用氨基脲处理黑松、日本落叶松、西伯利亚落叶松和道格拉斯冷杉木材，可防止树脂渗出和光致变色。这种处理也防止了道格拉斯冷杉和黑松木材的光致变色，但加速了落叶松木材的光致变色。(2)化学品对木材的浸渍对于道格拉斯冷杉木材的浸渍，发现：1）加压前的一个脱压阶段是有效的; 2）加压过程中每分钟加1公斤/厘米2以下的压力更有效; 92的最佳含水率; 4）木材的最佳含水率为17%。(3)氨基脲处理过程中树脂组分的变化在氨基脲处理过程中，发现一部分树脂组分溶解在氨基脲溶液中或转化为正己烷不溶物，并在残余树脂组分中引入1.48 - 0.59%的氮气，使其粘度增加。(4)氨基脲处理后的木材涂装用氨基脲处理后的道格拉斯冷杉木材不存在涂装问题，且不降低其防光变色效果。(5)氨基脲处理后木材的粘接性能研究结果表明，氨基脲处理后的道格拉斯冷杉木材不影响醋酸乙烯酯树脂胶粘剂的粘接性能。