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制造油毡用的涂盖沥青,要求软化点高、粘度大、挥发性小和热稳定好。但入厂的沥青有时不能完全达到这一要求。为了保证油毡的质量,我们对提高油毡涂盖沥青的性能作了多次试验,现已初步取得了良好的效果,提高了油毡的质量。我们改善涂盖沥青性能的具体作法是,将进厂的两种原沥青(大连4号和进口3号)按1∶1比例装入大铁锅内,加热熔融进行氧化。在加热过程中当沥青在锅内脱水结束,到澄清无泡沫时,即开始向锅内鼓入空气使沥青氧化(空气通过装在锅内的铁管喷出,见附图)。通入空气氧化的时间约1小时,在氧化
The coated asphalt for linoleum production requires high softening point, high viscosity, low volatility and good thermal stability. However, the asphalt entered into the plant sometimes cannot fully meet this requirement. In order to ensure the quality of the felt, we have made several tests to improve the performance of the felt covered asphalt. We have now achieved good results and improved the quality of the felt. The specific method for improving the performance of asphalt coating is to fill the two raw asphalts (Dalian No. 4 and No. 3 imported) into a large iron pan at a ratio of 1:1, and heat and melt for oxidation. During the heating process, when the dehydration of the pitch in the kettle is finished and when it is clear that there is no bubble, air is blown into the pot to oxidize the pitch (air is blown through the iron pipe installed in the pot, see the attached drawings). The time to air oxidation is about 1 hour, in the oxidation