• 专利标题:   Double insulation type self-limiting temperature heating cable used in electric heating element, comprises two parallel metal wire cores whose outside is covered with PTC material layer, where PTC material layer is covered with inner insulating layer and flame-retardant outer insulating layer.
  • 专利号:   CN115413075-A
  • 发明人:   JI C
  • 专利权人:   ANHUI HUANRUI ELECTROTHERMAL EQUIP CO
  • 国际专利分类:   C08K003/04, C08K009/02, C08K009/04, C08K009/12, C08L023/06, F16L053/38, H05B003/56
  • 专利详细信息:   CN115413075-A 29 Nov 2022 H05B-003/56 202308 Chinese
  • 申请详细信息:   CN115413075-A CN11145063 20 Sep 2022
  • 优先权号:   CN11145063

▎ 摘  要

NOVELTY - Double insulation type self-limiting temperature heating cable comprises metal wire cores, and the outside of two parallel metal wire cores is covered with a PTC material layer. The outer side of the PTC material layer is sequentially covered with an inner insulating layer and a flame-retardant outer insulating layer. The PTC material layer is made of polymer-based PTC material. The polymer-based PTC material includes the following raw materials: 70-80 pts. wt. polyethylene material, 7-8 pts. wt. modified graphene, 0.03 pts. wt. stabilizer, 30 pts. wt. carbon black and 10-12 pts. wt. compatibilizer. The modified graphene is prepared through the following steps (1) mixing graphene and water, stirring and dispersing under ice-water bath conditions, and (2) adding the pre-modified material and the branched modifier into chloroform, and vacuum-drying at 80°C until constant weight to obtain modified graphene. USE - The cable is used in electric heating element e.g. strip-shaped electric heater using resistivity positive temperature coefficient (PTC) conductive high polymer composite material as heating element. ADVANTAGE - The cable has good insulating performance, and improves the safety of the product. DETAILED DESCRIPTION - Double insulation type self-limiting temperature heating cable comprises metal wire cores, and the outside of two parallel metal wire cores is covered with a PTC material layer. The outer side of the PTC material layer is sequentially covered with an inner insulating layer and a flame-retardant outer insulating layer. The PTC material layer is made of polymer-based PTC material. The polymer-based PTC material includes the following raw materials: 70-80 pts. wt. polyethylene material, 7-8 pts. wt. modified graphene, 0.03 pts. wt. stabilizer, 30 pts. wt. carbon black and 10-12 pts. wt. compatibilizer. The modified graphene is prepared through the following steps (1) mixing graphene and water, stirring and dispersing under ice-water bath conditions, then adding ferric chloride solution and pyrrole, continuing stirring for 10-12 hours, after stirring, washing using water, centrifuging, detecting with silver nitrate solution, until there is no white precipitate, and vacuum-drying at 80°C to constant weight to obtain the pre-modified material, and (2) adding the pre-modified material and the branched modifier into chloroform, ultrasonically dispersing for 48 hours, and after the ultrasonic is finished, centrifuging at 4000 revolutions/minute for 30 minutes, and vacuum-drying at 80°C until constant weight to obtain modified graphene.