×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

chemical welding of polycarbonate

chemical welding of polycarbonate

chemical welding of polycarbonate

(OP)
Hi,
I have designed a plastic case such that a base plate snaps into place, but I need to chemically weld the two parts to ensure the final assembly doesn't come apart.  What type of glue or compound should I be using?  Any ideas or suggestions would be appreciated.
Cheers

RE: chemical welding of polycarbonate

We have done something similar here where I work.  We discovered some very interesting things.  Typically, you can use a cyanoacrylate (check Loctite's web site).  One thing about it, though, is that the surfaces adhere better if they're a little rough.  We found other factors influenced it, such as flexibility and part contour.  The chemically adhered surface becomes a little brittle, so high flexing can break the bond or the part.  If there are sinks, that also affects it because the recommended gap for the adhesive was 0-.005 inches.  There are different types of adhesives (gel-like, water-like, etc.) and also some with a rubber compound mixed in to lessen the brittle affect.  The problem with the rubber compound, is it also lessens the adhesion.  Hope this helps.  There may be other companies with adhesives that have different properties, as we have dealt mostly with Loctite for our application.

RE: chemical welding of polycarbonate

According to the Application Technology Information from Bayer (major producer of PC = Makrolon), they recommend the following chemicals for chemical welding : Methylene chloride (=Dichloromethane)or 1,2 Dichloroethane or 1,3 Dioxalane (=1,3 Dioxethane). Before bonding, slightly dissolve the contact areas for 5-10 sec and press them together 1 hour at 5-10 bars. For even better results, dissolve 5% PC in the chemical and apply this as a thin glue film. For high strength bonds, use Methylene Chloride. For good transparency, use 1,3 Dioxolane. From a health point of view (minimizing poisonous vapors), 1,3 Dioxolane is recommended. To get rid of vapors, condition the bonded parts 50-70°C (not higher, or else bubbles will form) for 24 hours, preferably in a vacuum chamber.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

White Paper – Data Security and Know-How Protection
Our data is constantly exposed to the danger of being intercepted or stolen as it wends its way over global data networks. Data security measures and measures for protecting intellectual property should not, however, first be implemented when data is exchanged – companies must lay the foundation for these measures within their own organization. Download Now
White Paper – Collaboration in the PLM Context
The influence exerted by the Internet of Things (IoT) means that there is a steadily growing need for collaboration in industry. Partners from new industries and areas of application need to be integrated in cross-company business processes to ensure that the lifecycle of smart, connected products can be managed from end to end. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close