@article{oai:kpu.repo.nii.ac.jp:00004860,
 author = {福山, 萬治郎 and Fukuyama, Manjiro},
 journal = {京都府立大學學術報告. 農學, The scientific reports of Kyoto Prefectural University. Agriculture},
 month = {Oct},
 note = {塗装木材の塗膜内部に発生する内部応力を明らかにするために, Table 1に示す組成および配合比をもった4種の木材用塗料について, 吸, 放湿下における塗膜の膨潤, 収縮率を測定した。塗膜の膨潤, 収縮率は, アルミ帯片の片面に硬化塗膜を形成して両端支持はりにし, 吸, 放湿下におけるスパン中央の最大たわみ量の変化を測定して(1)式からまず塗膜の膨潤または収縮応力(p)を求め, これと塗膜のヤング係数(E_1)(Fig. 1)からp/E_1として計算した。得られた主な結果を要約すると次の通りである。1)塗膜の膨潤または収縮応力の発生経過はFig. 3の通りで, その大きさの順位は アミノアルキッド>ポリウレタン>ポリエステル>ニトロセルロース・ラッカーである。2)塗膜の膨潤, 収縮率はTable 2,発生経過はFig. 5の通りで, その大きさはいずれも ポリウレタン>アミノアルキッド>ポリエステル>ニトロセルロース・ラッカーである。3)測定した塗膜の膨潤率(いわゆる"みかけの膨潤率")は吸湿水分の容積量にもとづくそれよりもはるかに小さく(Table 2,Table 3参照), とくにこの傾向はニトロセルロース・ラッカーにおいて顕著である。4)塗膜内収縮応力(硬化ひずみ)の吸湿に伴う緩和量(ε)はTable 3の通りで, 相対湿度5→80%の場合に"みかけの膨潤率"に対して, ポリエステル : 10.6%, ポリウレタン : 5.2%, アミノアルキッド : 12.0%, ニトロセルロース・ラッカー : 32.7%に達する。5)塗膜の含水率(Fig. 6)と膨潤率または収縮率との関係はFig. 7の通りで, 吸, 放湿の開始部分を除くと近似的に直線関係が成り立つ。6)塗膜と木材との膨縮差にもとづく塗膜内内部ひずみの大きさはTable 4の通りで, 塗料の種類によっては塗膜にわれ発生の危険が認められる。, In the present paper, the swelling and shrinkage of four kinds of paint films for wood coating, whose component and mixing ratio were indicated in Table 1,have been measured under adsorption and desorption of the water vapor as a clue to elucidate the internal stress developing within the paint films of the finished wood. The swelling and shrinkage of paint films were determined by p/E_1,in which p is the swelling-or shrinking stress of paint films calculated by eq. (1) from the maximum deflection at the center of span of aluminium strip with the cured paint films on one side under adsorption and desorption, and E_1 is Young's modulus of paint films (Fig. 1). The results obtained are as follows : 1) The progress of the swelling- and shrinking stress of paint films is illustrated in Fig. 3,and the magnitudes of their stresses give the following decreasing order. AA>PU>PE>NC. 2) The swelling and shrinkage of paint films used in this experiment are shown in Table 2,and the progress in Fig. 5. The order of the magnitudes of their values is found to be PU>AA>PE>NC. 3) The swelling amount of paint films in water vapor is further lower than that (α) obtained from the volume of water adsorbed without regard to paint films (see Tables 2 and 3). Especially it is found that this tendency is remarkable in paint film of nitrocellulose lacquer. 4) The percentage of the recovery (ε) of the curing strain within paint film accompanying adsorption to apparent swelling is 10.6% for polyester, 5.2% for polyurethane, 12.0% for amino alkyd, and 32.7% for nitrocellulose lacquer in the case of the change of relative humidity of 5 to 80%, as shown in Table 3. 5) The relationship between the swelling or shrinkage and moisture content of paint films (Fig. 6) gives straight line except for the starting part on adsorption and desorption, as shown in Fig. 7. 6) The magnitudes of the internal strain within paint films are determined from the difference of the swelling or shrinkage between paint film and wood, as illustrated in Table 4. It is assumed from these results that there is a risk of the occurrence of crack in some kinds of paint films.},
 pages = {52--62},
 title = {塗装木材の内部応力に関する研究 IV : 吸, 放湿下における木材用塗料塗膜の膨潤, 収縮性について(林学部門)},
 volume = {22},
 year = {1970},
 yomi = {フクヤマ, マンジロウ}
}