Method of washing polyamide producing apparatus |
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| 申请号 | US3653964D | 申请日 | 1969-11-10 | 公开(公告)号 | US3653964A | 公开(公告)日 | 1972-04-04 |
| 申请人 | TEIJIN LTD; | 发明人 | YAMAMOTO AKIRA; MORIYAMA KEIICHI; | ||||
| 摘要 | A method of removing a coating formed on a polyamide producing apparatus by contact with a molten polyamide, which comprises contacting the coating with a composition at a temperature not lower than 200* C., said composition consisting mainly of an ethanolamine and 0.01 to 10 percent by weight, based on said ethanolamine, of a basic substance selected from the group consisting of hydroxides of alkali metals, hydroxides of alkaline earth metals and salts of alkali metals with weak acids. | ||||||
| 权利要求 | 2. The method of claim 1 wherein the basic substance is present in an amount of from about 0.5 to 1.0 percent by weight. 3. The method of claim 1 wherein the basic compound is selected from sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, sodium carbonate, sodium hydrogencarbonate, potassium carbonate, potassium hydrogencarbonate, sodium phenoxide, potassium phenoxide, sodium formate, lithium acetate, sodium stearate and lithium palmitate. 4. The method of claim 1 wherein the temperature is between about 210* and about 230* C. |
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