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个人中心收藏查看我的收藏0有用+10F46播报讨论上传视频有机混合物F46是一种有机混合物，是四氟乙烯和六氟丙烯的共聚物，即聚全氟乙丙烯,六氟丙烯的含量约15%左右，是聚四氟乙烯的改性材料。中文名F46
外文名fluororesin-46
别    名聚全氟乙丙烯
熔    点(265±10)℃
密    度2.12～2.17
安全性描述一般
类    别四氟乙烯和六氟丙烯的共聚物
类    型改性材料
范    畴化学

目录
1简介2结构特点3性能▪物理性能▪电绝缘性能▪热性能▪耐化学稳定性▪力学性能▪其他性能4工艺要点5应用
简介
播报编辑F46树脂既具有与聚四氟乙烯相似的特性，又具有热塑性塑料的良好加工性能。因而它弥补了聚四氟乙烯加工困难的不足，使其成为代替聚四氟乙烯的材料，在电线电缆生产中广泛应用于高温高频下使用的电子设备传输电线、电子计算机内部的连接线、航空宇宙用电线及其特种用途安装线、油泵电缆和潜油电机绕组线的绝缘层。根据加工需要，F46可分为粒料、分散液和漆料三种。其中，粒料按其熔融指数的不同，可供模压、挤出和注射成型用；分散液供浸渍烧结用；漆料供喷涂等用。
结构特点
播报编辑F－46树脂和聚四氟乙烯一样，也是完全氟化的结构，不同的是聚四氟乙烯主链的部分氟原子被三氟甲基（－CF3）所取代，结构式如下：由此可见，F－46树脂和聚四氟乙烯虽都由碳氟元素组成，碳链周围完全被氟原子包围着，但F－46其大分子的主链上有分支和侧链。这种结构上的差别对于材料在长期应力下的温度范围上限来看，无很大影响，F－46的上限温度为200℃，而聚四氟乙烯的最高使用温度是260℃。但是，这种结构上的差别，却使F－46树脂具有相当确定的熔点，并可用一般的热塑性加工方法成型加工，使加工工艺大为简化。这是聚四氟乙烯所不具备的。这便是用六氟丙烯改性聚四氟乙烯的主要目的。
性能
播报编辑F－46中六氟丙烯的含量对共聚体的性能是有一定的影响。目前生产的F－46树脂的六氟丙烯的含量，通常在14%－25%（质量分数）左右。物理性能F－46树脂的分子量测定，目前尚无可行的方法。但它在380℃时的熔融粘度要比聚四氟乙烯低，为103－104Pa．s。可见F－46的分子量比聚四氟乙烯低得多。F－46的熔点随共聚体的组分不同而有一定的差异，共聚体中六氟丙烯的含量的增加时，熔点变低。按差热分析法所测得的结果，国产F－46树脂的熔点大多在250－270℃之间，比聚四氟乙烯低。F－46树脂是一种结晶性高聚物，结晶度比聚四氟乙烯低一些，当F－46熔体缓慢冷却到晶体熔点以下温度时，大分子重新结晶，结晶度在50%－60%之间；当熔体以淬火方式迅速冷却时，结晶度较小，在40%－50%之间。F－46的晶体结构形态，均为球晶结构，并随树脂和加工成型温度及热处理方式的不同而有一定的差异。电绝缘性能F－46的电绝缘性能和聚四氟乙烯十分相近。它的介电系数从深冷到最高工作温度，从50Hz到1010Hz超高频的广阔范围内几乎不变，并且很低，仅2．1左右。介质损耗角正切随频率的变化则有些变化，但随温度变化不大。F－46树脂的体积电阻率很高，一般大于1015?．m，且随温度变化甚微，也不受水和潮气的影响。耐电弧大于165s。F－46的击穿场随厚度的减少而提高，当厚度大于1mm时，击穿场强在30kV/mm以上，但不随温度的变化而变化。热性能F－46树脂的耐热性能 仅次于聚四氟乙烯，能在－85－+200℃的温度范围内连续使用。即使在－200℃和+260℃的极限情况下，其性能也不恶化，可以短时间使用。F－46树脂的热分解温度高于熔点温度，在400℃以上才发生显著的热分解，分解产物主要是四氟乙烯和六氟丙烯。由于F－46大分子通常带有的等端基在熔点以上温度时也会分解，因此300℃以上进行加工时也必须注意适当的通风。F－46在熔点温度以下是相当稳定的，但在200℃高温下机械强度损失较大。图2是F－46树脂的熔融指数在恒温下的瞬间变化情况，熔融指数表示F－46在372℃，5000g重力下，10min内流过规定孔径的克数，因此，可用熔融指数的增加来分析熔体粘度的减少及共聚物发生热分解的情况。图3是F－46与F－4绝缘电线相比较的寿命曲线。F－46在－250℃时仍不定期完硬脆，还保持有很小的伸长率和一定的曲挠性，比聚四氟乙烯甚至更好些，是其他所有各类塑料所不及的。耐化学稳定性F－46的耐化学稳定性与聚四氟乙烯相似，具有优异的耐化学稳定性。除与高温下的氟元素、熔融的碱金属和三氟化氯等发生反应外，与其他化学药品接触时均不被腐蚀。力学性能F－46与聚四氟乙烯相比，硬度及抗拉强度略有提高，摩擦系数也比聚四氟乙烯略大。常温下，F－46具有较好的耐蠕变性能；但当温度高于100℃时，耐蠕变性能反而不及聚四氟乙烯。其他性能F－46树脂在大气中抗氧化性能非常好，耐大气稳定性高。F－46的耐辐照性要比聚四氟乙烯好，略逊于聚乙烯。在空气中和室温下，F－46开始出现性能变化的最小吸收剂量为105－106rad?既103－104Gy，故可作耐辐照材料使用。
工艺要点
播报编辑F－46具有较好的加工工艺性能。可采用通常的挤出法包覆电线电缆的绝缘层。为了正确设计挤出机和模具，控制和掌握F－46树脂的加工条件，首先应了解F－46的流变性能。F－46在390℃温度下剪切应力与剪切速率的关系。其粘度μA随剪切速率加而下降。 F－46的临界剪切速率，如果剪切速率超过此数值，就会引起塑料流动的下均匀，结果使制品表面粗糙，无光泽和起层。F－46的临界剪切速率值与聚乙烯，尼龙相比相差悬殊，因而熔融破裂问题尤为严重。F－46树脂在加工中有两个特征，即具有熔融破裂的倾向和熔融状态时有特高的可拉伸性。为了在电线电缆生产中尽量消除或改善熔融破裂和提高生产率，通常采取以下措施：第一，采用挤管式模具，扩大模子的开口，以减慢聚合物在模口的流速，使之在低于临界剪切速率的适中挤出速度下挤出树脂，并提高生产率；第二，在不致使树脂分解的前提下，尽可能提高熔融树脂的温度，以降低树脂粘度，从而提高其临界剪切速率。（1） 挤出机螺杆的主要参数F－46的挤出机，一般采用单头全螺纹、等距、突变压缩型螺杆。为保证F－46树脂的充分塑化，螺杆的均化区长度，通常占螺杆全长的25%左右；螺杆顶端呈圆锥形，以防止树脂的停滞和分解。螺杆的主要技术参数如下：长径比L/D 20 螺距 1D加料区长度 15．5D 压缩区长度 0．5D均化区长度难关 4D 螺纹宽带 0．1D加料区螺纹槽深 ?h1　 1/6D均化区螺纹槽深 ?h2　 1/18D压缩比 ?h1/h2　 3?2　 F－46绝缘电线挤出工艺要点（1）供料：F－46挤出前，先在120℃下预烘3h左右为宜。（2）导电线芯预热：为保证挤出的F－46绝缘层内外温度均一，导电线芯应预热至300－350℃。（3）挤出机的温度分布：挤出机一般以280℃（进料口）至380℃（机头）直线上升的温度分布为好；机头温度波动范围不大于±5℃，并应在不致使树脂分解的前提下，尽量提高机头温度，以降低树脂的熔融粘度。挤出机机身（自进料口至机头）、机头、模套的参考温度如下：机身 第一段 280－310℃ 第二段 315－330℃第三段 340－360℃ 第四段 360－380℃机头 380℃ 模套 380－410℃（4）模套的拉伸比：宜选择在50－200范围内。（5）螺杆的转速：协同温度将螺杆转速调好后，在F－46树脂挤出加工过程中不要变动频繁，如有必要可稍加调整。螺杆转速应随导电线芯截面的大小而有所不同，一般可取5－15r/min。（6）模具模口保温：保温区应布满整个拉伸区，保温温度在350－380℃，以避免F－46的锥体至成型之前，由于表面骤冷而形成应力，从而导致绝缘开裂。（7）绝缘电线冷却：从挤出机挤出后的电线采用水冷。模口与水槽距离以较近为宜，建议不大于20cm。（8）设置滤网。为改善F－46树脂的塑化和混合质量，增加反压力，挤出机螺杆端部应加2－3层滤网为宜。（9）每批F－46材料应力求以最佳情况挤出，保证塑化良好，锥体透亮，无气泡，表面光滑，锥体与模套间无“眼屎”。每批料要做好工艺记录，以便积累资料和工艺数据，有利于质量分析。F－46绝缘电线在树脂质量不佳和挤出工艺不当时，绝缘层会发生开裂现象，其主要原因是：（a）绝缘层有内应力。生产内应力的原因很多，例如加工过程中树脂组成不均所引起的塑化不良和加工工艺不当等。（b）绝缘中大球晶、片晶交界面联系分子链少，或球晶过大、脆弱（c）不稳定基团产生的大分子的断链（d）树脂分子量过小或分布过宽，使材料承受强度降低。（e）六氟丙烯含量过低，组成分布不均匀。
应用
播报编辑聚全氟乙丙烯树脂具有与聚四氟乙烯相似的特性，又有热塑塑料的良好加工工艺，因而使之成为代替聚四氟乙烯的重要材料。F－46在电线电缆生产中广泛应用于高温高频下使用的电子设备传输线，电子计算机内部的连接线，航空宇宙用电线，及其他特种用途安装线、油矿测井电缆、潜油电机绕组线、微电机引出线等等。新手上路成长任务编辑入门编辑规则本人编辑我有疑问内容质疑在线客服官方贴吧意见反馈投诉建议举报不良信息未通过词条申诉投诉侵权信息封禁查询与解封©2025 Baidu 使用百度前必读 | 百科协议 | 隐私政策 | 百度百科合作平台 | 京ICP证030173号 京公网安备11000002000001号window.PAGE_DATA= 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F46 F46被认为是强氧化性特别是浓硝酸介质用材中bai综du合性能最好的材料，用于间接法（硝酸镁zhi法）浓硝酸的装置里的管道、阀门、冷凝器、泵类等使用效果非常好。 F46的应用范围： 矿物化学：浓硝酸的生产 有机化学：使用浓硝酸（硝化） 核工业：蒸发器在硝酸环境下工作，以浓缩聚变产物 冶金工业：坦克–用于亚硫酸氮混合物的设备 化学工业：亚硫酸铬混合物，极富氧化性的溶液 F46钢可在化工、化肥、矿山、冶金、国防、石化、医药、化纤、农药、染料、造纸、食品等行业广泛使用。C4不锈钢管主要用于耐浓硫酸浓硝酸尤其是耐浓度为98%以上的浓硫酸、浓硝酸项目! F46的热处理： 铸件升温至1050℃，经保温后入水冷却，进行固溶处理，以获得最佳耐腐蚀性能。焊接： 有良好的焊接性能，用奥0.12 硅焊条进行手工电弧焊，铸件焊后应进行固溶化处理。耐蚀性能： F46钢是强氧化性用材，它在常温下可耐硝酸的全浓度，在铬酸中也有极好的耐蚀性，在其他的腐蚀介质中也优于18-8型不锈钢。  PRODUCT PARAMETERS 产品参数 化学成分 成分 C Si Mn P S Cr Ni Mo N 最小值 - 3.7 - - - 16.5 14 - - 最大值 0.015 4.5 2 0.025 0.01 18.5 16 0.2 0.11 物理性能 抗拉强度： 530-730 N/mm² 屈服强度0.2％： 210 ≥N /mm² 伸长： 40/30 ≥％ 布氏硬度： 230 ≤HB