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橡胶工艺上粘合知识(1/2)

下面小编根据专业资料向大家介绍一下粘合的基础知识
 
Mechanisms ofBonding:
Two Coat System
双涂胶粘剂粘结机理

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Mechanisms of Bonding:
One Coat System
单涂粘结机理

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Mechanical and Chemical Mechanisms
物性及化学作用机理
Mechanical物性

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Chemical化学

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第二部分 粘结失效模式Bond Failure Modes
Methodsfor Troubleshooting Bond Failures
¨      Provide/definethe circumstances of the bond failure
  定义粘结失效情况
¨      Inspect/determinefailure mode(s), location, amount
  检测失效模式,位置,数量
¨      Reviewproduction materials and related processing
  审核产品材料和相关工艺
¨      Create alist of potential causes
  提出一系列潜在的因素
¨      Develop acorrective plan and test
  提出改进的计划及测试
¨      Changematerial and/or process to verify cause(s)
  根据影响因素更改材料或改进工艺
¨      Performonly one change at a time
  每次只改变一个影响条件


BondFailure Modes of ASTM D429
ASTMD429定义的粘结失效模式

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Cement-to-MetalFailure
CM失效模式
¨      Designatedas CM or M
  CM或M的定义
¨      Primeror adhesive failure at the substrate interface
  底涂或单涂胶粘剂与基材界面的粘结失效
¨      25+%of failures in industry
  在工业中占25%失效比例
¨      CommonCauses of Failure: Improper substrate preparation, improperhandling/application of Primer or Adhesive
 

典型的失效因素:不合适的基材处理,不正确的胶粘剂应用

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Cement-to-Primer Failure
CP失效模式
¨      Designatedas CP
  CP的定义
¨      Cement= Adhesive
  Cement =面涂胶粘剂
¨      Failureoccurs between primer and adhesive
  失效发生与底涂与面涂胶粘剂间
¨      <10%of failures in industry
  工业上发生概率<10%
¨      CommonCauses of Failure: Contaminated primer surface or improper handling/applicationof Primer or Adhesive, plasticizer migration from compound
                                         典型的失效因素:底涂表面被污染或不正确的胶粘剂应用,增塑剂的迁移

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Cohesive Failure
胶粘剂内聚破坏
¨      Not aASTM type but failure occurs within either primer or adhesive layer
  不是ASTM失效模式,但会在底涂或面涂胶粘剂层间发生
¨      Failureoccurs within either primer or adhesive layer
  失效发生在胶粘剂的层间
¨      <5%of failures in industry
  工业上发生概率<5%
¨      CommonCauses for Failure: Improper handling/application such as Primer or Adhesive istoo thick
                                               典型的失效因素:不正确的胶粘剂应用或胶粘剂太厚

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Rubber-to-CementFailure
RC失效模式
¨      Designatedas RC, cement = adhesive
  RC失效定义,cement = 面涂胶粘剂
¨      Failureoccurs between rubber and adhesive
  失效发生在橡胶与胶粘剂间
¨      Lookfor evidence of adhesive adhering to substrate, but not to rubber surface
  胶粘剂与基材有良好的粘结,但是与橡胶表面粘结失效
¨      50+%of failures in industry
  工业上发生概率50+%
¨      CommonCauses of Failure: Adhesive applied too thin, improper mold cycle, bond-linestresses during de-mold, improper adhesive choice
  典型的失效因素:胶粘剂太薄,不正确的硫化和脱模,胶粘剂选择错误

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PartIII
ASTMD429 Bond Tests and Standards
ASTMD429粘结测试及标准
ASTMInternational
¨      ASTM isthe American Society for Testing and Materials
  ASTM是美国对于测试及材料的标准
¨      Web site:www.astm.org
  网址:www.astm.org
¨      CommitteeD-11 handles RTM bonding
  D-11委员会执行RTM粘结
¨      ASTMmethods have been the standard for defining bond failure modes, lab andproduction testing and new product development for many years
  ASTM已经成为定义粘结失效模式,实验室及产品测试,新产品开发的标准
¨      All testreport data reported with pull value and % rubber retention
                                                       所有的测试数据应记录拉伸强度和覆胶率

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ASTM D429 Tests
ASTM D429 测试
¨      METHOD A: Button     扯离
¨      METHODB:  Coupon   剥离
¨      METHODC:  Conical   锥形扯离
¨      METHODD:  Post Bond (PV bonding) 后硫化粘结测试
¨      METHODE:  Rubber Lining  橡胶内衬测试
¨      METHODF:  Buffer      弧面扯离
¨      METHOD G:Double Shear Cylindrical  双剪切测试
¨      METHOD H:Quadruple Shear   四面剪切测试
ASTMD429 Method B (Coupon)
¨      45undefinedordm; or 90undefinedordm;peel, 2 inches (5 cm)/minute or 20 inches (50 cm)/minute, 45undefinedordm; peel preferreddue to shear angle
  45undefinedordm; or 90undefinedordm;剥离,拉伸速度5CM或50CM每分钟,由于剪切角的原因, 45undefinedordm;剥离为首选
¨      Primaryand environmental tests
  常规及耐环境测试
¨      Verydependent on tear and tensile strength of rubber
  很大程度取决于橡胶的撕裂和拉伸强度
¨      Lowerdiscrimination than other test methods
  相对于其他测试方法辨别力低
¨      Inexpensive,easy to coat and mold parts, quick feedback
  便宜,方便涂胶和成型,快速反馈结果
¨      Compression,transfer and injection molding
  模压,转移模,注塑成型
¨      Mostwidely used method for customer screening and our new product developments
  广泛用于新产品开发和客户胶粘剂选型
ASTM429 Method C (Conical)
¨       Combination ofshear/tension
  剪切/拉伸的结合
¨       Expensive inserts
  标准件昂贵
¨       Time consuming,difficult to prepare and coat metal inserts
  耗时久,表面处理及涂胶困难
¨       Good test for primeradhesion at the tip
  对于顶端的底涂胶粘剂有良好的测试
¨       Transfer mold only
  只用转移模成型
¨       Limited use due toexpense and time
  由于费用及时间限制其使用
ASTM D429 Method D (Post Bond)
¨       Uses curedcompression set rubber
  使用压缩变形放置橡胶
¨       Tensile test
  拉伸测试
¨       Requires fixture jig(10% compression) to obtain bond-line pressure
  需要固定夹套(10%压缩率)来得到粘结压力
¨       Compatible assemblyoil is used between adhesive and cured rubber
  为方便装配可在胶粘剂和橡胶间使用专用装配油润滑
¨       Excellent, inexpensivetest for adhesion to cured rubber
  对于硫化橡胶与胶粘剂是极好的,便宜的测试
ASTM D429 Method F (Buffer)
¨       Inexpensive tensiletest
  便宜的拉伸实验
¨       Top surface isconvex, applies high shear force to primer at edges during pull test
  在测试中表面的弧度给边缘的底涂胶粘剂以高的剪切力
¨       Good for primary orenvironmental tests
  良好的常规或耐环境性测试
¨       Part can cycled infatigue testing (for example: 3 Hertz, 30% elongation for 1MM cycles)
  零件可以在耐疲劳实验中循环使用(如:3Hz,30%延长率100万次疲劳实验)
¨       Transfer orinjection molding
   转移模或注塑模成型
¨       *Preferred test ofmany Automotive applications
   对于汽车应用零件是优选的测试方法
Part IV
Production Bond Test Methods
产品粘结测试方法
¨       Bondtests should be conducted per engineering specification for manufactured partsor customer’s special requirements:
   测试应根据工程规范或客户特殊要求进行
¨      Fixturing for push or pull out or hand peel
  推、拉、手工剥离应配备固定夹具
¨      Establish specification range: % rubber retention, 90%+is typical (plus load value from test machine), range depends upon material,bond surface area, type of force and speed of testing
  确定规范:%橡胶保留,典型的附胶率为90+%(加上从测试仪器上得到的强度),规范的范围取决于材料,粘结表面,加载力的类型和测试速度
¨      Additional tests to include dynamic cycling, temperatureand fluid soaks, etc.
  其他测试包括动态循环测试,高低温度和液体浸泡等
Production Bond Test Methods
¨      Establish bond test frequency: for example: 1 part permold cycle, 1 or 3 times per shift, etc.
   确定粘接测试频率:如每模一个零件,每班次1-3个零件等
¨       Bond tests shouldcomplete separate the substrate from the rubber in the bonded region
   测试应该将基材从的橡胶粘结区域完全分离开
¨       Most importantly,bond tests are a measurement of production quality and should prevent defectiveparts from reaching end customer
  最重要的是,粘结测试是一种生产产品质量的检测方法,应防止有缺陷的产品流向最终客户
¨       Scrap rates aretypically maintained below 2%
  典型的废品率应控制在<2%
¨       Periodic audits ofall processes are beneficial to ensure that processes are maintained withinproduction specifications
  定期的对所有工艺的审核,将有利于工艺在产品生产规范中运行。



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