PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Reasons for Difficult Adhesive of PTFE Plastic
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-31
Visits:
The application of a material often raises the issue of bonding with other materials, of which bonding is a widely used modern technology. PTFE due to its special molecular junction
structure, the molecule is non-polar, and becomes a difficult-to-stick material in synthetic materials. After the advent of this material at home and abroad, a lot of research on its bonding technology has been carried out.
This solves its bonding problem.
The reason why PTFE is difficult to stick is difficult to prove theoretically. Generally, it is analyzed from the molecular structure, and now it is mostly explained from its surface characteristics.
Figure 1: PTFE tube Source: Dankai
PTFE viscosity parameter
1. All adhesives shall not wet the surface of PTFE
Generally, adhesives are flowing before curing. The bonding process is that the glue is distributed on the bonding surface. The curing process is that wet contact is the primary condition for bonding. Liquid
The wettability of a body in contact with a solid can be expressed as a contact angle.
Dankai polytetrafluoroethylene (PTFE) has a highly symmetrical structure and is a non-polar polymer. Adhesive adsorption on the surface of PTFE is caused by intermolecular forces, which include
including orientation force, induced force and dispersion force. However, the non-polar surface of PTFE does not have the conditions to form orientation force and induction force, and can only form weak dispersion force, so its adhesion performance is poor.
2.PTFE requires minimal energy to repel liquids in contact with it.
The work W required for a solid to repel a liquid in contact with it (the same as the subsequent energy shown in the table).
Polytetrafluoroethylene PTFE has the smallest contact energy, it can be understood that PTFE easily repels contact with the liquid. The swelling and dissolution of PTFE is more difficult than that of non-crystalline polymers.
Adhesive coated on the surface of PTFE is difficult to occur high polymer molecular chain diffusion and entanglement, can not form a strong adhesion, adhesive liquid is not easy to adhere to it.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
Ptfe, teflon, surface, contact, molecule, material, wetting, repelling, adhesion
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