| 摘要 |
<p>An acid-resistant moulded article, e.g. a storage battery case, is formed of material comprising an asphaltic binder containing an incompletely polymerized resin and a filler comprising mineral matter and acid-attackable organic fibre, the resin being capable of being completely polymerized, in the presence of the acid to which the article is to be resistant, e.g. battery acid, to a state inert to said acid. Suitable resins are partially polymerized furfuryl alcohol, phenol-formaldehyde and phenol-furfural condensation products. The mineral matter may be pyrophyllite talc and the organic fibres cotton linters. Preferably the asphaltic binder should have a penetration between 5 and 25 at 150 DEG F. in 5 seconds under a weight of 100 grams, and the blended binder penetration should not exceed 30. The resin may be made by refluxing furfuryl alcohol with dilute phosphoric acid to a viscosity of 70,000 to 100,000 centipoises at 75 DEG F.; by refluxing 188 grams of phenol and 135 grams of formaldehyde in the presence of dilute sulphuric acid for an hour; or by refluxing 94 parts of phenol and 144 parts of furfural in dilute caustic soda for four hours. In examples, the proportions of the components are asphalt 45 per cent, resin 4 per cent, mineral matter 40 per cent and fibre 11 per cent. Mixing of the ingredients and moulding of the article are performed by known methods. The temperature attained during mixing should not exceed 350 DEG F. and water may be included in the mix for this purpose.</p> |
