| 摘要 |
The ingredient of rubber mixes described in the parent Specification, which is made by grinding an earthy material such as whiting with 01--10 per cent of an organic acid, salt, or ester, in a ball mill having balls of less than 2in. in diameter, occupy at least 15 per cent of the volume of the mill, and are driven at least 25 per cent of the critical speed, is now prepared in a pebble, rod, tube, or like mill, under the same conditions of size, volume and speed. The duration of grinding is determined experimentally, the mill being stopped just before the end of the free-flowing stage is reached. The material may be employed as an ingredient of paints, putties or the like.ALSO:The ingredient of rubber mixes of the parent Specification, which is made by grinding an earthy material such as whiting, with 0,1-10 per cent of an organic acid, salt, or ester, in a ball mill having balls of less than 2 in. in diameter, occupy at least 15 per cent of the volume of the mill, and are driven at least 25 per cent of the critical speed, is now prepared in a pebble, rod, tube, or like mill under the same conditions of size, volume, and speed. The duration of grinding is determined experimentally, the mill being stopped just before the end of the free-flowing stage is reached. The material may be employed as an ingredient of paints, putties, or the like. |
