木材用塗料塗膜の引張強度と応力緩和
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概要
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In order to make clear the relationship between the internal stress developed in paint films of finished wood and their mechanical properties, the strength properties and the stress relaxation in tension of paint films for wood coating were measured. The paints used in the experiments were polyester, polyurethane, amino alkyd resin and nitrocellulose lacquer (Table I). The results obtained are as follows : (1) The Young's modulus, proportional limit and breaking stress of polyester and amino alkyd paint films were greater than those of polyurethane and lacquer paints. while the breaking strain of the former was smaller than that of the latter (Table II). (2) In the stress-strain curve of polyurethane paint film, the yield point was recognized in all cases, and the plastic deformation was considerable above the yield point (Fig. 1). (3) The strain at proportional limit of paint films was a constant value of 0.4〜0.9% without regard to the temperature (Table II). (4) The Young's modulus, proportional limit, breaking stress and breaking strain of paint films changed almost linearly with increasing temperature (Fig. 2). Their temperature coefficients were as shown in Table 111. (5) The order of the magnitude in the relaxation of stress was as follows: PU>NC>AA≒PE, as shown in Fig.4 and Table IV. (6) In the case of stress level of 10, 30, and 50% of the proportional limit, plots of relaxation coefficient (m) against stress level showed approximately a linear relationship (Fig. 5). (7) The results in the long-duration stress relaxation test showed that the stress in polyester paint film decreased about 15% of initial stress in 10 hrs., the amino alkyd paint film about 52% in 33.3 hrs., the lacquer paint film about 64% in 21.6 hrs., and the polyurethane paint film about 86% in 30 hrs. (Table V).
- 1975-09-15
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