-
公开(公告)号：EP4166602A1
公开(公告)日：2023-04-19
申请号：EP20943688.0
申请日：2020-12-29
发明人： CHANG, Huan , YE, Nanbiao , LI, Cheng , ZHOU, Wohua , LIU, Xinxin , ZHU, Xiumei , SU, Yujun , TANG, Lei , HUANG, Xianbo
摘要： A recycling process for a polyamide waste material includes the following steps: adding a polyamide waste material into a mixed solvent to obtain a solution, heating the solution to 50 °C to a reflux temperature of the solution, conducting stirring for dissolution, and then conducting decolorization treatment and filtration to obtain a polyamide solution; and adding the polyamide solution into water, precipitating polyamide as a solid in deionized water, and conducting separation to obtain recycled polyamide. The mixed solvent includes, in parts by weight, 10-30 parts of phenol and 15-40 parts of toluene. A phenol/toluene-based solvent system used in the present invention has the following advantages: firstly, the phenol in the solvent can realize "secondary" end-capping of the polyamide, so that the end-capping rate is increased, and the hydrolysis resistance, alcoholysis resistance, and aging resistance are improved; secondly, it is ensured that after the polyamide solution is added into the deionized water, the polyamide can be fully precipitated out, and the obtained polyamide has good crystallization properties; and thirdly, the phenol/toluene solvent system has low volatility and irritation, has less damage to equipment under high temperature conditions, and is environmentally friendly and free of pollution.
搜索结果
1 条记录 (耗时 0.008 秒)
