قراءة كتاب Paint Technology and Tests
تنويه: تعرض هنا نبذة من اول ١٠ صفحات فقط من الكتاب الالكتروني، لقراءة الكتاب كاملا اضغط على الزر “اشتر الآن"
and Mixed Oils
| Sample No. | Straight linseed |
Soya 25 per cent. Linseed 75 per cent. |
Soya 50 per cent. Linseed 50 per cent. |
Soya 75 per cent. Linseed 25 per cent. |
| 1 | 190.3 | 175.2 | 160.7 | 140.4 |
| 2 | 189.5 | 175.9 | 161.7 | 140.8 |
| 3 | 188.0 | 175.4 | 160.3 | 139.0 |
| Average | 189.3 | 175.5 | 160.9 | 140.4 |
TABLE III
Soya Bean Oil and Lead Drier
| Per cent. PbO |
0.05 | 0.10 | 0.30 | 0.50 | 0.70 | 1.00 | 1.30 | 1.60 | |||
| ⎧ | 1 | day | — | 0.07 | 0.63 | 1.34 | 1.05 | 1.53 | 0.93 | 1.35 | |
| ⎪ | 3 | days | — | 0.07 | 3.52 | 4.31 | 2.75 | 4.86 | 4.82 | 4.12 | |
| ⎪ | 5 | days | — | 0.09 | 5.04 | 6.06 | 6.09 | 6.75 | 6.66 | 5.52 | |
| Per ct. gain | ⎨ | 12 | days | — | — | 6.88 | 7.54 | 7.43 | 7.76 | 7.32 | 6.47 |
| ⎪ | 15 | days | — | — | 8.84 | 8.93 | 8.59 | 8.81 | 8.44 | 7.46 | |
| ⎩ | 20 | days | 0.05 | 0.20 | 9.02 | 9.08 | 8.90 | 9.03 | 8.65 | 7.83 | |
Soya Bean Oil and Manganese Drier
| Per cent. MnO2 | 0.01 | 0.05 | 0.15 | 0.26 | 0.30 | |||
| Per ct. gain | ⎧ | 1 | day | — | — | 0.02 | 0.02 | 0.01 |
| ⎨ | 10 | days | — | 5.06 | 6.48 | 6.10 | 5.97 | |
| ⎩ | 20 | days | 0.05 | 9.07 | 8.80 | 6.78 | 6.51 | |
Soya Bean Oil, Manganese and Lead Drier
| Per cent. PbO | 0.20 | 0.30 | 0.50 | |||
| MnO2 | 0.05 | 0.15 | 0.25 | |||
| Per ct. gain | ⎧ | 1 | day | 3.04 | 3.77 | 3.74 |
| ⎨ | 8 | days | 5.96 | 6.43 | 6.47 | |
| ⎩ | 12 | days | 6.33 | 6.78 | 6.67 | |
Tung Oil. There are grown in China and Japan many varieties of the “aleurites cordata,” popularly known as the tung tree. This tree bears great quantities of large sized nuts containing as high as 40% of an oil which yields itself in a viscous yellow form upon heating and crushing of the fruit. The raw oil, which chemically consists of the glycerides of oleic, oleo-margaric, and probably isomeric acids, is distinguished by its rapid drying properties. When spread in a thin layer it produces a hard film with an opaque frosted surface, often showing a tendency to wrinkle. Treated tung oil will dry to a clear, water-shedding, elastic film. This oil is made by heating the raw tung oil at a comparatively low temperature with other oils and a metallic drier
